/* roulang page: index */
:root {
            --bg-deep: #070C14;
            --bg-main: #0A0F1B;
            --bg-panel: #0E1626;
            --bg-card: rgba(17, 24, 38, 0.72);
            --bg-card-solid: #111826;
            --border-light: rgba(255, 255, 255, 0.08);
            --border-bright: rgba(255, 255, 255, 0.16);
            --accent: #35D0FA;
            --accent-2: #1E6FFF;
            --amber: #FFB84D;
            --amber-deep: #FF9F4A;
            --green: #4ADE80;
            --red: #F87171;
            --text-main: #EAF2FF;
            --text-sub: #9AAAC3;
            --text-dim: #6A7B96;
            --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.5);
            --radius-card: 20px;
            --radius-btn: 12px;
            --radius-tag: 999px;
            --header-h: 78px;
            --max-w: 1200px;
            --font-safe: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
        }

        *, *::before, *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-safe);
            background-color: var(--bg-main);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s, opacity 0.2s;
        }

        ul, ol {
            list-style: none;
        }

        button, input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
            color: inherit;
        }

        button {
            cursor: pointer;
        }

        .container {
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            white-space: nowrap;
            border-width: 0;
        }

        /* 背景质感 */
        .bg-grid {
            background-image: linear-gradient(rgba(53, 208, 250, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(53, 208, 250, 0.04) 1px, transparent 1px);
            background-size: 42px 42px;
        }

        /* Header */
        .site-header {
            height: var(--header-h);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            transition: background 0.4s, box-shadow 0.4s, backdrop-filter 0.4s;
            border-bottom: 1px solid transparent;
        }

        .site-header.is-scrolled {
            background: rgba(7, 12, 20, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(53, 208, 250, 0.2);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
        }

        .nav-wrap {
            display: flex;
            align-items: center;
            height: var(--header-h);
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 0 24px;
            gap: 24px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
            font-weight: 700;
            font-size: 1.2rem;
            line-height: 1.2;
            color: #fff;
            letter-spacing: 0.3px;
        }

        .brand .brand-mark {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, rgba(53, 208, 250, 0.2), rgba(30, 111, 255, 0.2));
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(53, 208, 250, 0.45);
            box-shadow: 0 0 20px rgba(53, 208, 250, 0.1);
        }

        .brand .brand-mark i {
            color: var(--accent);
            font-size: 1.1rem;
        }

        .brand-text {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
        }

        .brand-text b {
            font-weight: 900;
            font-size: 1.3rem;
            letter-spacing: 0.5px;
            background: linear-gradient(90deg, #EAF2FF 30%, #35D0FA 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: var(--text-main);
        }

        .site-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
            justify-content: center;
        }

        .site-nav a.nav-link {
            padding: 10px 18px;
            border-radius: var(--radius-btn);
            font-size: 0.96rem;
            font-weight: 500;
            color: var(--text-sub);
            position: relative;
            transition: color 0.2s, background 0.2s;
        }

        .site-nav a.nav-link:after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 999px;
            transition: width 0.3s;
        }

        .site-nav a.nav-link:hover,
        .site-nav a.nav-link:focus-visible {
            color: var(--text-main);
        }

        .site-nav a.nav-link.active {
            color: var(--text-main);
            font-weight: 500;
            background: rgba(53, 208, 250, 0.08);
        }

        .site-nav a.nav-link.active:after {
            width: 20px;
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-hot-entry {
            padding: 9px 22px;
            background: linear-gradient(90deg, rgba(53, 208, 250, 0.12), rgba(53, 208, 250, 0.04));
            border: 1px solid rgba(53, 208, 250, 0.35);
            border-radius: var(--radius-btn);
            font-weight: 500;
            font-size: 0.92rem;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s;
            white-space: nowrap;
        }

        .nav-hot-entry i {
            font-size: 0.8rem;
            color: var(--amber);
        }

        .nav-hot-entry:hover {
            background: rgba(53, 208, 250, 0.2);
            border-color: var(--accent);
            box-shadow: 0 0 24px rgba(53, 208, 250, 0.2);
        }

        .search-toggle {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--text-sub);
            transition: all 0.2s;
        }

        .search-toggle:hover {
            color: var(--accent);
            border-color: rgba(53, 208, 250, 0.4);
        }

        /* 导航下拉 Mega Menu */
        .nav-mega {
            position: relative;
            z-index: 1100;
        }

        .dropdown-panel {
            position: absolute;
            top: calc(var(--header-h) - 12px);
            left: 50%;
            transform: translateX(-50%) translateY(10px);
            width: 760px;
            max-width: calc(100vw - 24px);
            background: rgba(10, 15, 27, 0.96);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(53, 208, 250, 0.2);
            border-radius: 20px;
            box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
            padding: 22px;
            display: flex;
            gap: 20px;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
        }

        .dropdown-panel.show {
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
        }

        .mega-col {
            flex: 1;
        }

        .mega-col h4 {
            font-size: 0.85rem;
            text-transform: uppercase;
            color: var(--text-dim);
            letter-spacing: 1px;
            margin-bottom: 16px;
            font-weight: 700;
        }

        .mega-col a.mega-link {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 14px;
            border-radius: 10px;
            color: var(--text-sub);
            font-size: 0.92rem;
            transition: all 0.2s;
            border: 1px solid transparent;
        }

        .mega-col a.mega-link:hover {
            background: rgba(53, 208, 250, 0.08);
            color: var(--accent);
            border-color: rgba(53, 208, 250, 0.2);
        }

        .mega-col a.mega-link span.tag-new {
            background: rgba(255, 184, 77, 0.12);
            color: var(--amber);
            padding: 2px 8px;
            border-radius: 999px;
            font-size: 0.65rem;
            font-weight: 700;
        }

        .mega-featured {
            background: linear-gradient(180deg, rgba(15, 22, 38, 0.9), rgba(10, 15, 27, 0.9));
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 14px;
            padding: 14px;
            margin-top: 10px;
        }

        /* 移动端汉堡 */
        .hamburger {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 10px;
            color: var(--text-main);
            font-size: 1.25rem;
            background: rgba(255, 255, 255, 0.02);
        }

        .mobile-drawer {
            position: fixed;
            top: 0;
            right: 0;
            height: 100vh;
            width: min(360px, 86vw);
            background: rgba(7, 12, 20, 0.98);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            z-index: 2000;
            box-shadow: -20px 0 60px rgba(0, 0, 0, 0.6);
            padding: 20px 24px;
            display: flex;
            flex-direction: column;
            transform: translateX(100%);
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            border-left: 1px solid rgba(53, 208, 250, 0.15);
        }

        .mobile-drawer.open {
            transform: translateX(0);
        }

        .mobile-drawer .drawer-head {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 18px;
            border-bottom: 1px solid var(--border-light);
        }

        .drawer-close {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: 1px solid var(--border-bright);
            color: var(--text-sub);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .mobile-nav {
            display: flex;
            flex-direction: column;
            gap: 8px;
            padding: 18px 0;
            flex: 1;
        }

        .mobile-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 16px;
            border-radius: 14px;
            color: var(--text-main);
            font-size: 1rem;
            border: 1px solid transparent;
            transition: all 0.2s;
        }

        .mobile-nav a i {
            color: var(--text-dim);
            width: 22px;
            text-align: center;
        }

        .mobile-nav a.active {
            background: rgba(53, 208, 250, 0.1);
            border-color: rgba(53, 208, 250, 0.2);
        }

        .drawer-footer {
            padding-top: 18px;
            border-top: 1px solid var(--border-light);
        }

        .overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1900;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s;
            backdrop-filter: blur(2px);
        }

        .overlay.show {
            opacity: 1;
            visibility: visible;
        }

        /* Hero */
        .hero-section {
            min-height: 100vh;
            position: relative;
            display: flex;
            align-items: center;
            padding: calc(var(--header-h) + 40px) 0 80px;
            overflow: hidden;
            background-image: linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px), linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px);
            background-size: 44px 44px;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -100px;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(30, 111, 255, 0.18), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 20%;
            right: 20%;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(53, 208, 250, 0.8), transparent);
            box-shadow: 0 0 30px rgba(53, 208, 250, 0.6);
            pointer-events: none;
        }

        .hero-inner {
            display: flex;
            align-items: center;
            gap: 60px;
            position: relative;
            z-index: 2;
        }

        .hero-text {
            flex: 0 0 42%;
            max-width: 560px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 184, 77, 0.08);
            border: 1px solid rgba(255, 184, 77, 0.2);
            padding: 6px 16px;
            border-radius: 999px;
            font-size: 0.82rem;
            color: var(--amber);
            margin-bottom: 22px;
        }

        .hero-badge i {
            font-size: 0.7rem;
        }

        .hero-title {
            font-size: clamp(2.5rem, 6vw, 4rem);
            font-weight: 900;
            line-height: 1.25;
            margin-bottom: 22px;
            letter-spacing: -0.01em;
            color: var(--text-main);
        }

        .hero-title .accent {
            background: linear-gradient(135deg, #35D0FA, #1E6FFF);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            position: relative;
        }

        .hero-subtitle {
            font-size: 1.16rem;
            line-height: 1.8;
            color: var(--text-sub);
            margin-bottom: 24px;
            max-width: 500px;
        }

        .hero-subtitle strong {
            color: var(--text-main);
            font-weight: 600;
        }

        .hero-cards-row {
            display: flex;
            gap: 14px;
            align-items: center;
            flex-wrap: wrap;
            margin-top: 10px;
        }

        .hero-mini-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            padding: 10px 14px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .hero-mini-card i {
            color: var(--amber);
        }

        .hero-mini-card span {
            font-size: 0.85rem;
            color: var(--text-sub);
        }

        .btn-group-hero {
            display: flex;
            gap: 16px;
            margin-top: 14px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: linear-gradient(90deg, #1E6FFF, #35D0FA);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            padding: 16px 38px;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(53, 208, 250, 0.2);
            transition: all 0.25s;
            border: 1px solid rgba(255, 255, 255, 0.14);
            text-align: center;
        }

        .btn-primary i {
            transition: transform 0.2s;
        }

        .btn-primary:hover {
            box-shadow: 0 10px 40px rgba(53, 208, 250, 0.35);
            transform: translateY(-2px);
            border-color: rgba(53, 208, 250, 0.5);
        }

        .btn-primary:hover i {
            transform: translateX(3px);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            border: 1px solid var(--border-bright);
            color: var(--text-sub);
            font-weight: 500;
            font-size: 1rem;
            padding: 16px 30px;
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.02);
            backdrop-filter: blur(8px);
            transition: all 0.25s;
        }

        .btn-ghost:hover {
            border-color: rgba(53, 208, 250, 0.6);
            background: rgba(53, 208, 250, 0.06);
            color: var(--text-main);
        }

        /* Hero phone mockup */
        .hero-visual {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
            min-width: 320px;
        }

        .hero-visual-bg {
            position: absolute;
            width: 300px;
            height: 300px;
            border-radius: 24px;
            background: linear-gradient(45deg, rgba(53, 208, 250, 0.05) 20%, transparent), url('/assets/images/backpic/back-1.webp') center/cover;
            filter: blur(45px);
            opacity: 0.6;
            z-index: -1;
        }

        .phone-mock {
            width: 300px;
            height: 620px;
            border-radius: 34px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            position: relative;
            padding: 12px;
            background: linear-gradient(180deg, rgba(15, 22, 38, 0.8), rgba(7, 12, 20, 0.9));
            box-shadow:
                0 20px 60px rgba(0, 0, 0, 0.6),
                0 0 40px rgba(53, 208, 250, 0.06),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(20px);
            display: flex;
            flex-direction: column;
            align-items: center;
            transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
            transition: transform 0.5s;
        }

        .phone-mock:hover {
            transform: perspective(1000px) rotateY(-2deg) rotateX(0deg);
        }

        .phone-notch {
            width: 96px;
            height: 22px;
            background: rgba(0, 0, 0, 0.6);
            border-radius: 999px;
            margin-bottom: 12px;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .phone-screen {
            flex: 1;
            width: 100%;
            border-radius: 22px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.05);
            background: linear-gradient(160deg, #0F1626 0%, #0A0F1B 100%);
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .phone-screen::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image: radial-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 16px 16px;
        }

        .phone-feed {
            padding: 14px 12px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            overflow: hidden;
            position: relative;
            z-index: 2;
            height: 100%;
        }

        .mock-card {
            background: linear-gradient(135deg, rgba(20, 28, 45, 0.9), rgba(13, 19, 32, 0.9));
            border-radius: 14px;
            padding: 12px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .mock-card-image {
            height: 110px;
            border-radius: 10px;
            background-size: cover;
            background-position: center;
            margin-bottom: 10px;
            position: relative;
        }

        .mock-card-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, 0.4));
            border-radius: 10px;
        }

        .mock-card-title {
            height: 12px;
            background: rgba(255, 255, 255, 0.35);
            border-radius: 4px;
            margin-bottom: 6px;
        }

        .mock-card-text {
            height: 8px;
            background: rgba(255, 255, 255, 0.14);
            border-radius: 4px;
            width: 80%;
        }

        .mock-card-user {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 10px;
        }

        .mock-avatar {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--accent);
            opacity: 0.7;
        }

        .mock-avatar.amber {
            background: var(--amber);
        }

        .mock-avatar.blue {
            background: #1E6FFF;
        }

        .mock-username {
            height: 6px;
            width: 60%;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 999px;
        }

        /* Section shared */
        .section {
            padding: 100px 0;
        }

        .section-head {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 70px;
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 999px;
            background: rgba(53, 208, 250, 0.1);
            color: var(--accent);
            border: 1px solid rgba(53, 208, 250, 0.2);
            font-size: 0.84rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            margin-bottom: 16px;
        }

        .section-title {
            font-size: clamp(1.8rem, 4.8vw, 2.8rem);
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.02em;
            margin-bottom: 14px;
        }

        .section-sub {
            font-size: 1.12rem;
            color: var(--text-sub);
            line-height: 1.8;
        }

        /* Hot cards */
        .hot-cards {
            padding-top: 0;
            margin-top: -40px;
        }

        .hot-grid {
            display: grid;
            grid-template-columns: repeat(2, 2fr);
            grid-template-rows: auto auto;
            gap: 24px;
        }

        .hot-card {
            position: relative;
            background: linear-gradient(135deg, rgba(17, 24, 38, 0.8), rgba(10, 15, 27, 0.85));
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            overflow: hidden;
            padding: 10px 10px 20px 10px;
            display: flex;
            gap: 16px;
            transition: all 0.3s;
            animation: float-in 0.7s ease;
        }

        .hot-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5);
            border-color: rgba(53, 208, 250, 0.4);
        }

        .hot-card .hot-badge {
            position: absolute;
            top: 12px;
            right: 60px;
            z-index: 3;
        }

        .hot-card-main {
            grid-column: span 2;
        }

        .hot-card-main .hot-image {
            height: 340px;
        }

        .hot-image {
            border-radius: 14px;
            overflow: hidden;
            position: relative;
            background-size: cover !important;
            background-position: center !important;
            min-height: 150px;
            flex: 0 0 45%;
        }

        .hot-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .hot-card:hover .hot-image img {
            transform: scale(1.04);
        }

        .hot-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.55), transparent 70%);
            border-radius: inherit;
        }

        .hot-badge {
            display: inline-block;
            background: linear-gradient(90deg, var(--amber-deep), var(--amber));
            color: #0A0F1B;
            font-size: 0.7rem;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 999px;
            box-shadow: 0 4px 14px rgba(255, 155, 80, 0.4);
            letter-spacing: 0.03em;
            z-index: 1;
        }

        .hot-content {
            padding: 0 8px 0 12px;
            flex: 1;
            display: flex;
            flex-direction: column;
            min-width: 0;
        }

        .hot-tags {
            display: flex;
            gap: 6px;
            margin: 16px 0 10px;
            flex-wrap: wrap;
        }

        .tag-sm {
            background: rgba(53, 208, 250, 0.08);
            border: 1px solid rgba(53, 208, 250, 0.2);
            padding: 3px 12px;
            border-radius: 999px;
            font-size: 0.72rem;
            color: var(--accent);
        }

        .badge-amber {
            background: rgba(255, 184, 77, 0.1);
            border-color: rgba(255, 184, 77, 0.4);
            color: var(--amber);
        }

        .hot-title {
            font-size: 1.4rem;
            font-weight: 800;
            margin-bottom: 12px;
            line-height: 1.45;
        }

        .hot-card:not(.hot-card-main) .hot-title {
            font-size: 1.15rem;
        }

        .hot-desc {
            font-size: 1rem;
            color: var(--text-sub);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .hot-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: auto;
            color: var(--text-dim);
            font-size: 0.85rem;
        }

        .similarity {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .similarity i {
            color: var(--amber);
        }

        /* 种草清单 section */
        .guide-section {
            margin-top: 0;
            padding-top: 70px;
        }

        .step-grid {
            display: flex;
            align-items: flex-start;
            justify-content: center;
            gap: 28px;
            margin-top: 40px;
        }

        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-card);
            padding: 40px 28px 28px;
            border: 1px solid var(--border-light);
            flex: 1;
            max-width: 300px;
            text-align: center;
            transition: all 0.3s;
            backdrop-filter: blur(10px);
        }

        .step-card:nth-child(2) {
            transform: translateY(22px);
        }

        .step-card:hover {
            transform: translateY(-6px);
            border-color: rgba(53, 208, 250, 0.4);
        }

        .step-card:nth-child(2):hover {
            transform: translateY(16px);
        }

        .step-icon {
            width: 88px;
            height: 88px;
            margin: 0 auto 24px;
            border-radius: 30px;
            background: radial-gradient(circle at top left, rgba(53, 208, 250, 0.4), rgba(30, 111, 255, 0.08));
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(53, 208, 250, 0.3);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 10px 30px rgba(0, 0, 0, 0.4);
            position: relative;
            overflow: hidden;
        }

        .step-icon::after {
            content: '';
            position: absolute;
            top: -15px;
            left: -15px;
            right: 50%;
            bottom: 50%;
            background: rgba(255, 255, 255, 0.2);
            filter: blur(12px);
            border-radius: 50%;
        }

        .step-icon i {
            font-size: 2rem;
            color: var(--accent);
            z-index: 2;
        }

        .step-count {
            position: absolute;
            top: -10px;
            right: -12px;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--amber-deep), var(--amber));
            color: #0A0F1B;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 6px 20px rgba(255, 184, 77, 0.5);
            z-index: 3;
        }

        .step-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .step-card p {
            color: var(--text-sub);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* usecase section */
        .usecase-row {
            display: flex;
            align-items: center;
            gap: 40px;
            margin-bottom: 80px;
        }

        .usecase-row:last-child {
            margin-bottom: 0;
        }

        .usecase-media {
            flex: 0 0 46%;
            border-radius: 22px;
            overflow: hidden;
            height: 300px;
            background-size: cover;
            background-position: center;
            position: relative;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
        }

        .usecase-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .usecase-media .media-tag {
            position: absolute;
            top: 16px;
            left: 16px;
            z-index: 2;
        }

        .usecase-text {
            flex: 1;
        }

        .usecase-text h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .usecase-text p {
            color: var(--text-sub);
            margin-bottom: 14px;
            line-height: 1.8;
        }

        .usecase-list {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .usecase-list li {
            display: flex;
            gap: 10px;
            align-items: center;
        }

        .usecase-list li i {
            color: var(--green);
            font-size: 0.8rem;
        }

        .usecase-list li span {
            color: var(--text-main);
            font-weight: 500;
        }

        /* Testimonial marquee */
        .reviews-section {
            background-color: #080E18;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            margin: 0 auto;
            width: 100%;
            overflow: hidden;
        }

        .reviews-inner {
            padding: 60px 0;
        }

        .marquee-row {
            margin-top: 30px;
            display: flex;
            overflow: hidden;
            position: relative;
            width: 100%;
            mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
            -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
            padding: 20px 0;
        }

        .marquee-track {
            display: flex;
            gap: 20px;
            animation: marquee-scroll 40s linear infinite;
            width: max-content;
        }

        .marquee-row:hover .marquee-track {
            animation-play-state: paused;
        }

        .review-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: 16px;
            padding: 18px 20px;
            width: 280px;
            flex-shrink: 0;
            display: flex;
            gap: 12px;
            backdrop-filter: blur(8px);
        }

        .review-card-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(53, 208, 250, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 0.8rem;
            font-weight: 700;
        }

        .review-card-body p {
            color: var(--text-sub);
            font-size: 0.88rem;
            line-height: 1.6;
            margin: 4px 0 8px;
        }

        .review-card-name {
            color: var(--text-dim);
            font-size: 0.75rem;
            letter-spacing: 0.02em;
        }

        .review-stars {
            color: var(--amber);
            font-size: 0.7rem;
            letter-spacing: 3px;
            margin-bottom: 4px;
        }

        @keyframes marquee-scroll {
            0% {
                transform: translateX(0%);
            }
            100% {
                transform: translateX(calc(-50% - 10px));
            }
        }

        /* CTA */
        .cta-section {
            position: relative;
            overflow: hidden;
        }

        .cta-wrapper {
            background-image: linear-gradient(120deg, rgba(15, 20, 36, 0.97), rgba(8, 12, 22, 0.96)), url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            border-radius: 28px;
            border: 1px solid rgba(53, 208, 250, 0.2);
            padding: 60px 70px;
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.07), var(--shadow-card);
        }

        .cta-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 30px;
            flex-wrap: wrap;
        }

        .cta-left h2 {
            font-size: clamp(1.6rem, 3vw, 2.4rem);
            font-weight: 800;
            margin-bottom: 12px;
        }

        .cta-left p {
            color: var(--text-sub);
            max-width: 520px;
            margin-bottom: 22px;
        }

        .trust-tags {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
        }

        .trust-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--text-sub);
        }

        .trust-tag i {
            color: var(--green);
            font-size: 0.8rem;
        }

        .btn-cta-primary {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
            color: #fff;
            font-weight: 700;
            padding: 18px 46px;
            border-radius: 18px;
            font-size: 1.1rem;
            box-shadow: 0 10px 30px rgba(53, 208, 250, 0.25);
            transition: all 0.3s;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .btn-cta-primary:hover {
            box-shadow: 0 10px 36px rgba(53, 208, 250, 0.45);
            transform: translateY(-2px) scale(1.01);
        }

        /* News / CMS section */
        .news-section {
            background-color: #080E18;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .news-layout {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 28px;
            align-items: start;
        }

        .newsfeature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: 20px;
            overflow: hidden;
            transition: all 0.3s;
            display: flex;
            flex-direction: column;
        }

        .newsfeature-card:hover {
            transform: translateY(-5px);
            border-color: rgba(53, 208, 250, 0.45);
        }

        .newsfeature-img {
            height: 220px;
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .newsfeature-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(7, 12, 20, 0.8), transparent 50%);
        }

        .newsfeature-content {
            padding: 20px 22px 26px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .newsfeature-title {
            font-size: 1.4rem;
            font-weight: 800;
            line-height: 1.5;
            margin-bottom: 10px;
        }

        .newsfeature-excerpt {
            color: var(--text-sub);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }

        .news-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .news-list-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: 16px;
            padding: 18px 20px;
            transition: all 0.25s;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .news-list-item:hover {
            background: rgba(53, 208, 250, 0.08);
            border-color: rgba(53, 208, 250, 0.4);
            transform: translateX(4px);
        }

        .news-meta {
            font-size: 0.78rem;
            color: var(--text-dim);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .news-list-item .news-meta {
            margin-bottom: 4px;
        }

        .news-list-item .news-list-title {
            font-weight: 600;
            font-size: 1rem;
            line-height: 1.5;
            color: var(--text-main);
        }

        .news-list-item .news-excerpt-sm {
            color: var(--text-sub);
            font-size: 0.84rem;
            line-height: 1.6;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .list-separator {
            margin-left: 4px;
            margin-right: 4px;
            width: 3px;
            height: 3px;
            background: var(--text-dim);
            border-radius: 50%;
            display: inline-block;
        }

        .category-pill {
            font-size: 0.72rem;
            font-weight: 600;
        }

        .category-pill.blue {
            color: var(--accent);
        }

        .category-pill.amber {
            color: var(--amber);
        }

        .news-empty {
            background: var(--bg-card);
            border: 1px dashed var(--border-bright);
            border-radius: 20px;
            padding: 40px;
            text-align: center;
            grid-column: 1 / -1;
            color: var(--text-dim);
        }

        .news-empty i {
            font-size: 2rem;
            display: block;
            margin-bottom: 12px;
            color: var(--text-dim);
        }

        /* FAQ */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: 18px;
            overflow: hidden;
            transition: all 0.3s;
        }

        .faq-item.active {
            border-color: rgba(53, 208, 250, 0.55);
            background: rgba(17, 24, 38, 0.9);
        }

        .faq-question {
            width: 100%;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            font-size: 1.02rem;
            font-weight: 600;
            color: var(--text-main);
            min-height: 60px;
            text-align: left;
        }

        .faq-question .faq-q-text {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .faq-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            border: 1px solid var(--border-bright);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            transition: transform 0.3s;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: rgba(53, 208, 250, 0.2);
            border-color: var(--accent);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            color: var(--text-sub);
            line-height: 1.8;
            transition: max-height 0.4s ease;
            font-size: 1rem;
        }

        .faq-item.active .faq-answer {
            max-height: 600px;
        }

        .faq-answer-inner {
            padding: 0 24px 22px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            margin: 0 22px;
            padding-top: 18px;
            padding-left: 46px;
            padding-right: 0;
            padding-bottom: 20px;
            color: var(--text-sub);
            font-size: 0.92rem;
        }

        /* Footer */
        .site-footer {
            background: #060A11;
            border-top: 1px solid rgba(255, 255, 255, 0.07);
            color: var(--text-sub);
            display: flex;
            align-items: center;
            flex-direction: column;
        }

        .footer-inner {
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 60px 24px 30px;
            width: 100%;
            display: flex;
            justify-content: space-between;
            gap: 60px;
            flex-wrap: wrap;
        }

        .footer-column {
            flex: 1;
            min-width: 180px;
        }

        .footer-column.brand-col {
            flex: 1.4;
            min-width: 240px;
        }

        .footer-brand-title {
            font-size: 1.1rem;
            color: var(--text-main);
            font-weight: bold;
            display: flex;
            align-items: center;
            gap: 0;
            margin-bottom: 6px;
        }

        .footer-brand-desc {
            color: var(--text-dim);
            font-size: 0.9rem;
            line-height: 1.7;
            margin: 12px 0 18px;
            max-width: 300px;
        }

        .footer-title {
            color: var(--text-main);
            font-weight: 600;
            font-size: 0.98rem;
            margin-bottom: 14px;
        }

        .footer-link-item {
            display: block;
            color: var(--text-sub);
            font-size: 0.86rem;
            padding: 5px 0;
            transition: all 0.2s;
        }

        .footer-link-item:hover {
            color: var(--accent);
        }

        .footer-status {
            font-size: 0.75rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 999px;
            border: 1px solid rgba(74, 222, 128, 0.25);
            background: rgba(74, 222, 128, 0.05);
            color: var(--green);
            margin-top: 10px;
        }

        .footer-bottom {
            width: 100%;
            text-align: center;
            border-top: 1px solid var(--border-light);
            padding: 22px 24px;
            font-size: 0.8rem;
            color: var(--text-dim);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .footer-bottom .text-area {
            width: 100%;
            max-width: 1200px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
        }

        .footer-bottom a {
            color: var(--text-sub);
        }

        .back-to-top {
            position: fixed;
            right: 20px;
            bottom: 24px;
            width: 44px;
            height: 44px;
            border-radius: 14px;
            background: var(--bg-card-solid);
            border: 1px solid var(--border-bright);
            display: none;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 1.1rem;
            z-index: 999;
            backdrop-filter: blur(10px);
            transition: all 0.2s;
        }

        .back-to-top:hover {
            background: var(--accent);
            color: #0A0F1B;
        }

        .back-to-top.show {
            display: flex;
        }

        .divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--amber));
            border-radius: 999px;
            margin: 16px auto 20px;
        }

        .bottom-cta-sub-line {
            display: flex;
            justify-content: flex-end;
            margin-top: 18px;
            flex-wrap: wrap;
            gap: 12px;
        }

        a.btn-ghost.xs {
            padding: 8px 20px;
            border-radius: 12px;
            font-size: 0.85rem;
        }

        /* motion */
        @keyframes float-in {
            0% {
                opacity: 0;
                transform: translateY(24px);
            }
            100% {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @media (max-width: 1020px) {
            .site-nav {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .nav-right {
                margin-left: auto;
            }

            .hero-inner {
                flex-direction: column;
                gap: 60px;
            }

            .hero-text {
                flex: 1 1 auto;
                max-width: 100%;
                text-align: center;
            }

            .hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }

            .hero-cards-row, .btn-group-hero {
                justify-content: center;
            }

            .hero-visual {
                margin: 0 auto;
                width: 100%;
            }

            .phone-mock {
                height: 560px;
            }

            .hot-grid {
                grid-template-columns: 1fr;
            }

            .hot-card-main {
                grid-column: span 1;
            }

            .hot-card-main .hot-image {
                height: 250px;
                flex-basis: 60%;
            }

            .news-layout {
                grid-template-columns: 1fr;
            }

            .usecase-row {
                flex-direction: column;
            }

            .usecase-media {
                width: 100%;
            }

            .step-grid {
                flex-direction: column;
                align-items: center;
            }

            .step-card {
                max-width: 480px;
                width: 100%;
            }
        }

        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }

            .section {
                padding: 60px 0;
            }

            .brand-text b {
                font-size: 1.1rem;
            }

            .phone-mock {
                height: 480px;
                width: 260px;
                border-radius: 28px;
                padding: 10px;
            }

            .mock-card-image {
                height: 90px;
            }

            .hero-title {
                font-size: clamp(1.8rem, 7vw, 2.6rem);
            }

            .hero-subtitle {
                font-size: 1rem;
            }

            .hero-section {
                padding-top: calc(var(--header-h) + 20px);
            }

            .hot-card {
                flex-direction: column;
            }

            .hot-card-main .hot-image {
                height: 200px;
            }

            .hot-content {
                padding: 0 10px;
            }

            .cta-wrapper {
                padding: 30px 24px;
            }

            .review-card {
                width: 240px;
            }

            .footer-inner {
                flex-direction: column;
                gap: 36px;
                padding-top: 40px;
                padding-bottom: 10px;
            }

            .faq-answer-inner {
                padding-left: 22px;
            }

            .usecase-row {
                gap: 24px;
                margin-bottom: 60px;
            }

            .usecase-text h3 {
                font-size: 1.3rem;
            }

            .step-card:nth-child(2) {
                transform: translateY(0);
            }

            .hero-visual {
                display: none;
            }

            .hero-text {
                max-width: 100%;
            }

            .nav-hot-entry span {
                display: none;
            }

            .nav-hot-entry {
                padding: 9px 12px;
            }
        }

/* roulang page: article */
:root{
  --bg-main:#0A0F1B;
  --bg-deep:#070C15;
  --bg-panel:#111826;
  --glass-bg:rgba(255,255,255,.035);
  --glass-strong:rgba(17,24,38,.92);
  --border-main:rgba(255,255,255,.08);
  --border-strong:rgba(255,255,255,.14);
  --accent:#35D0FA;
  --accent-blue:#1E6FFF;
  --amber:#FFB84D;
  --green:#4ADE80;
  --text-main:#EAF2FF;
  --text-sub:#9AAAC3;
  --text-dim:#64748B;
  --radius-xl:26px;
  --radius-lg:20px;
  --radius-md:14px;
  --shadow-card:0 24px 80px -32px rgba(0,0,0,.6),0 1px 0 rgba(255,255,255,.07) inset;
  --shadow-glow:0 12px 40px -12px rgba(53,208,250,.4);
  --font-main:"PingFang SC","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-main);
  font-size:16px;
  line-height:1.7;
  color:var(--text-main);
  background:var(--bg-main);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none;transition:color .25s ease}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.container-narrow{max-width:800px;margin:0 auto;padding:0 24px}
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;height:76px;
  background:transparent;
  transition:background .35s ease,backdrop-filter .35s ease,box-shadow .35s ease,border-color .35s ease;
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  background:rgba(10,15,27,.72);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(53,208,250,.22);
  box-shadow:0 12px 40px rgba(7,12,21,.35);
}
.header-inner{
  max-width:1240px;height:76px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;
}
.brand-logo{
  display:inline-flex;align-items:center;gap:12px;
  flex-shrink:0;
}
.brand-logo-icon{
  width:38px;height:38px;border-radius:11px;
  background:linear-gradient(135deg,rgba(53,208,250,.28),rgba(30,111,255,.24));
  border:1px solid rgba(53,208,250,.4);
  color:var(--accent);
  display:flex;align-items:center;justify-content:center;
  font-size:1rem;
  box-shadow:0 0 22px rgba(53,208,250,.12);
}
.brand-logo-text{
  font-size:1.32rem;font-weight:800;letter-spacing:.3px;color:var(--text-main);
  white-space:nowrap;
}
.brand-accent{color:var(--accent)}
.brand-mark{
  width:38px;height:38px;border-radius:11px;
  background:linear-gradient(135deg,rgba(53,208,250,.3),rgba(30,111,255,.25));
  border:1px solid rgba(53,208,250,.4);
  color:var(--accent);
  display:inline-flex;align-items:center;justify-content:center;font-size:1rem;
}
.site-nav{display:flex;align-items:center;gap:28px;margin-left:36px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;height:76px;
  font-size:.9rem;font-weight:500;color:var(--text-sub);
  white-space:nowrap;transition:color .25s ease;
}
.nav-link:hover{color:#fff}
.nav-link.active{color:#fff}
.nav-link.active::after{
  content:"";position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  background:var(--accent);border-radius:2px;box-shadow:0 0 16px rgba(53,208,250,.55);
}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:16px}
.header-hot-btn{
  height:38px;padding:0 20px;border-radius:999px;
  border:1px solid var(--border-strong);
  background:rgba(255,255,255,.04);
  display:inline-flex;align-items:center;gap:8px;
  font-size:.82rem;color:var(--text-main);
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease;
}
.header-hot-btn i{color:var(--accent);font-size:.82rem}
.header-hot-btn:hover{
  background:rgba(255,255,255,.09);transform:translateY(-2px);
  box-shadow:0 10px 28px rgba(0,0,0,.3);
}
.mobile-toggle{
  display:none;height:40px;width:40px;border-radius:12px;
  align-items:center;justify-content:center;
  font-size:1.1rem;color:var(--text-main);
  border:1px solid var(--border-main);
  transition:background .2s ease;
}
.mobile-toggle:hover{background:rgba(255,255,255,.06)}
.article-main{min-height:80vh;padding-top:76px}
.article-hero{
  position:relative;min-height:420px;display:flex;align-items:center;
  padding:72px 0 56px;overflow:hidden;
}
.article-hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  z-index:0;
}
.article-hero-bg::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(10,15,27,.78) 0%,rgba(10,15,27,.92) 100%),
    radial-gradient(ellipse at 20% 10%,rgba(53,208,250,.12),transparent 50%);
}
.article-hero-content{position:relative;z-index:2}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:9px;
  font-size:.82rem;color:var(--text-dim);margin-bottom:26px;
}
.breadcrumb a{color:var(--text-sub);transition:color .2s}
.breadcrumb a:hover{color:var(--accent)}
.crumb-sep{color:rgba(255,255,255,.25)}
.crumb-current{color:var(--text-sub)}
.category-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 16px;border-radius:999px;
  border:1px solid rgba(255,184,77,.36);
  background:rgba(255,184,77,.09);
  color:var(--amber);
  font-size:.78rem;font-weight:500;letter-spacing:.4px;
  margin-bottom:20px;
}
.category-tag i{font-size:.75rem}
.article-hero-title{
  font-size:2.75rem;line-height:1.28;letter-spacing:.2px;
  font-weight:800;color:var(--text-main);
  max-width:820px;
  word-break:break-word;
}
.article-meta-row{
  display:flex;flex-wrap:wrap;gap:18px 26px;margin-top:26px;
  color:var(--text-dim);font-size:.84rem;
}
.meta-item{display:inline-flex;align-items:center;gap:7px}
.meta-item i{color:var(--accent);opacity:.8;font-size:.9rem}
.article-content-section{
  padding:64px 0 74px;
}
.article-content-card{
  position:relative;
  border:1px solid var(--border-main);
  border-radius:var(--radius-xl);
  background:
    linear-gradient(145deg,rgba(21,30,48,.82),rgba(10,15,27,.78));
  box-shadow:var(--shadow-card);
  padding:56px 60px;
  overflow:hidden;
}
.article-content-card::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse at 80% -10%,rgba(53,208,250,.09),transparent 42%);
}
.article-prose{
  position:relative;font-size:1.06rem;line-height:1.9;color:#CBD6E8;
}
.article-prose p{margin-bottom:1.45rem}
.article-prose h2{
  margin:2.8rem 0 1.15rem;font-size:1.65rem;font-weight:700;
  color:var(--text-main);line-height:1.4;
}
.article-prose h3{
  margin:2.2rem 0 1rem;font-size:1.28rem;font-weight:700;
  color:var(--text-main);
}
.article-prose h4{
  margin:1.6rem 0 .8rem;font-size:1.1rem;font-weight:700;color:var(--text-main);
}
.article-prose strong{color:#fff;font-weight:600}
.article-prose a{
  color:var(--accent);text-decoration:underline;
  text-underline-offset:4px;
}
.article-prose a:hover{color:#7DE8FF}
.article-prose ul{
  list-style:none;margin:1.4rem 0 1.6rem;padding:0;
}
.article-prose ul li{
  position:relative;padding-left:28px;margin-bottom:.7rem;
  color:#B8C6DC;
}
.article-prose ul li::before{
  content:"\f00c";
  font-family:"Font Awesome 6 Free";font-weight:900;
  position:absolute;left:0;top:.18rem;
  color:var(--accent);font-size:.82rem;
}
.article-prose ol{
  margin:1.4rem 0 1.6rem;padding-left:22px;
}
.article-prose ol li{
  padding-left:8px;margin-bottom:.7rem;color:#B8C6DC;
}
.article-prose blockquote{
  position:relative;margin:1.8rem 0;padding:22px 28px;
  background:rgba(53,208,250,.06);
  border:1px solid rgba(53,208,250,.14);
  border-radius:var(--radius-md);
  color:#D3E4F6;
  font-style:normal;
}
.article-prose blockquote p:last-child{margin-bottom:0}
.article-prose img{
  border-radius:18px;margin:2rem auto;
  box-shadow:0 18px 48px rgba(0,0,0,.44);
}
.article-prose figure{margin:2rem auto}
.article-prose figure img{margin:0}
.article-prose figcaption{
  text-align:center;color:var(--text-dim);font-size:.78rem;
  padding:12px 0 4px;
}
.article-prose hr{
  height:1px;background:var(--border-main);border:none;margin:2.4rem 0;
}
.article-bottom-bar{
  position:relative;display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:16px;margin-top:42px;padding-top:30px;
  border-top:1px solid rgba(255,255,255,.08);
}
.bottom-text{font-size:.82rem;color:var(--text-dim)}
.back-home-link{
  display:inline-flex;align-items:center;gap:8px;
  height:40px;padding:0 22px;border-radius:12px;
  border:1px solid var(--border-main);
  color:var(--text-sub);font-size:.84rem;
  transition:all .25s ease;
}
.back-home-link:hover{
  color:#fff;border-color:rgba(53,208,250,.3);
  background:rgba(53,208,250,.06);
  transform:translateY(-1px);
}
.related-section{
  padding:56px 0 70px;
  border-top:1px solid rgba(255,255,255,.05);
}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:20px;margin-bottom:34px;flex-wrap:wrap;
}
.section-head .eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:.76rem;
  color:var(--amber);letter-spacing:.4px;margin-bottom:8px;
}
.section-head .eyebrow::before{
  content:"";width:6px;height:6px;border-radius:999px;background:var(--amber);
}
.section-head h2{
  font-size:1.8rem;font-weight:800;color:var(--text-main);
}
.section-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.84rem;color:var(--text-sub);
  padding:10px 0;transition:color .25s ease;
}
.section-link:hover{color:var(--accent)}
.related-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;
}
.related-card{
  display:flex;flex-direction:column;
  border:1px solid var(--border-main);
  border-radius:22px;
  background:linear-gradient(145deg,rgba(20,29,46,.72),rgba(13,19,31,.8));
  overflow:hidden;
  transition:transform .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.related-card:hover{
  transform:translateY(-6px);
  border-color:rgba(53,208,250,.28);
  box-shadow:0 24px 62px rgba(0,0,0,.45);
}
.related-media{
  height:164px;overflow:hidden;
}
.related-media img{
  width:100%;height:100%;object-fit:cover;
  transition:transform .5s ease;
}
.related-card:hover .related-media img{transform:scale(1.05)}
.related-tag{
  position:absolute;left:12px;top:12px;z-index:2;
  padding:4px 12px;border-radius:999px;
  background:rgba(10,15,27,.55);
  border:1px solid rgba(255,255,255,.24);
  color:rgba(255,255,255,.9);
  backdrop-filter:blur(10px);
  font-size:.72rem;
}
.related-card-inner{
  position:relative;flex:1;padding:20px 20px 22px;
  display:flex;flex-direction:column;
}
.related-title{
  font-size:1rem;font-weight:600;line-height:1.55;color:var(--text-main);
  margin-bottom:10px;
}
.related-title a{color:inherit;transition:color .25s}
.related-title a:hover{color:var(--accent)}
.related-desc{
  font-size:.84rem;line-height:1.7;color:var(--text-dim);
  flex:1;
}
.related-foot{
  margin-top:18px;display:flex;align-items:center;justify-content:space-between;
  color:var(--text-dim);font-size:.76rem;
}
.related-foot a{
  color:var(--accent);font-size:.8rem;
}
.related-foot a i{font-size:.72rem;margin-left:3px}
.article-cta{
  padding:36px 0 90px;
}
.article-cta-inner{
  position:relative;
  border-radius:28px;
  background:radial-gradient(ellipse at 75% 30%,rgba(53,208,250,.2),transparent 55%),
  linear-gradient(120deg,rgba(30,111,255,.4),rgba(53,208,250,.12)),
  var(--bg-panel);
  border:1px solid rgba(53,208,250,.22);
  padding:42px 46px;
  display:flex;align-items:center;justify-content:space-between;gap:28px;
  overflow:hidden;
}
.article-cta-inner h2{
  font-size:1.5rem;font-weight:800;color:#fff;margin-bottom:8px;
}
.article-cta-inner p{color:var(--text-sub);font-size:.92rem;max-width:560px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;flex-shrink:0}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 24px;border-radius:13px;
  font-size:.84rem;font-weight:600;
  transition:background .25s ease,transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.btn-primary{
  background:linear-gradient(120deg,#35D0FA,#1E6FFF);
  color:#05121E;font-weight:700;
  box-shadow:0 12px 36px rgba(30,111,255,.28);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 16px 44px rgba(53,208,250,.35);
}
.btn-outline{
  border:1px solid var(--border-strong);
  color:var(--text-main);
  background:rgba(255,255,255,.04);
}
.btn-outline:hover{
  border-color:rgba(53,208,250,.4);
  background:rgba(53,208,250,.08);
  transform:translateY(-1px);
}
.empty-state{
  max-width:680px;margin:60px auto;
  padding:64px 40px;text-align:center;
  border:1px dashed rgba(53,208,250,.34);
  background:rgba(53,208,250,.04);
  border-radius:28px;
}
.empty-state .empty-icon{
  width:70px;height:70px;margin:0 auto 24px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.6rem;color:var(--accent);
  background:rgba(53,208,250,.08);
  border:1px solid rgba(53,208,250,.22);
  border-radius:22px;
}
.empty-state h1{font-size:1.7rem;font-weight:800;margin-bottom:14px;color:#fff}
.empty-state p{margin-bottom:26px;color:var(--text-sub)}
.empty-state .btn-primary{font-size:.88rem}
.site-footer{
  background:#0B1120;
  border-top:1px solid rgba(255,255,255,.05);
  position:relative;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(53,208,250,.5),transparent);
}
.footer-inner{
  max-width:1200px;margin:0 auto;padding:66px 24px 42px;
  display:grid;grid-template-columns:1.35fr .85fr .85fr 1.1fr;
  gap:46px;
}
.brand-col .brand-text .footer-brand-title{
  font-size:1.1rem;font-weight:800;letter-spacing:.3px;color:#fff;
}
.footer-brand-title span{color:var(--accent)}
.footer-brand-desc{
  color:var(--text-dim);font-size:.86rem;margin:18px 0 16px;
  max-width:340px;line-height:1.8;
}
.footer-status{
  display:inline-flex;align-items:center;gap:7px;
  border:1px solid rgba(74,222,128,.18);border-radius:999px;
  padding:4px 14px;background:rgba(74,222,128,.06);
  color:#9BF0C0;font-size:.76rem;
}
.footer-status i{
  font-size:.5rem;color:var(--green);
  border-radius:50%;
  box-shadow:0 0 0 3px rgba(74,222,128,.12);
}
.footer-column .footer-title{
  font-size:.95rem;font-weight:700;letter-spacing:.2px;color:#EAF2FF;
  margin-bottom:22px;position:relative;padding-bottom:12px;
}
.footer-column .footer-title::after{
  content:"";position:absolute;left:0;bottom:0;width:24px;height:1px;
  background:var(--accent);
  box-shadow:0 0 12px rgba(53,208,250,.4);
}
.footer-link-item{
  display:flex;align-items:center;gap:7px;
  color:var(--text-dim);font-size:.85rem;margin-bottom:11px;
  transition:color .25s ease,transform .25s ease;
}
.footer-link-item i{color:rgba(255,255,255,.3);font-size:.72rem;transition:transform .2s ease}
.footer-link-item:hover{
  color:var(--accent);transform:translateX(4px);
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.05);
  padding:22px 24px;
}
.footer-bottom .text-area{
  max-width:1200px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  flex-wrap:wrap;gap:12px;
  color:var(--text-dim);font-size:.78rem;
}
.footer-bottom .list-separator{
  width:1px;height:12px;background:rgba(255,255,255,.16);
}
.back-to-top{
  position:fixed;right:24px;bottom:24px;z-index:80;
  width:44px;height:44px;border-radius:14px;
  border:1px solid rgba(53,208,250,.4);
  background:rgba(17,24,38,.88);
  backdrop-filter:blur(12px);
  display:flex;align-items:center;justify-content:center;
  color:var(--accent);font-size:1rem;
  box-shadow:0 14px 40px rgba(0,0,0,.42);
  transition:transform .25s ease,background .25s ease;
}
.back-to-top:hover{
  transform:translateY(-3px);
  background:rgba(53,208,250,.12);
}
@media (max-width: 1024px){
  .site-nav{gap:22px;margin-left:26px}
  .footer-inner{grid-template-columns:1fr 1fr;gap:38px}
  .article-content-card{padding:46px}
  .related-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 900px){
  .site-nav{
    display:none;position:fixed;top:76px;left:20px;right:20px;
    z-index:101;flex-direction:column;align-items:stretch;gap:0;
    background:var(--glass-strong);
    backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    border:1px solid var(--border-strong);
    border-radius:20px;
    padding:12px;
    box-shadow:0 32px 80px rgba(0,0,0,.5);
  }
  .site-nav.open{display:flex}
  .site-nav .nav-link{
    height:48px;padding:0 8px;font-size:.96rem;border-radius:10px;
  }
  .nav-link.active::after{display:none}
  .nav-link.active{color:var(--accent);background:rgba(53,208,250,.08)}
  .mobile-toggle{display:inline-flex}
  .header-hot-btn{display:none}
  .article-cta-inner{flex-direction:column;text-align:center;padding:34px}
}
@media (max-width: 640px){
  .header-inner{padding:0 18px}
  .brand-logo-text{font-size:1.1rem}
  .article-hero{padding-top:64px;min-height:auto}
  .article-hero-title{font-size:1.9rem}
  .article-content-section{padding:24px 0 42px}
  .container-narrow{padding:0 16px}
  .article-content-card{padding:30px 14px;border-radius:18px}
  .article-content-card::before{border-radius:18px}
  .article-prose{font-size:1rem;line-height:1.85}
  .article-prose h2{font-size:1.4rem}
  .related-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr;padding-top:44px;gap:34px}
  .footer-bottom .text-area{justify-content:flex-start}
  .article-bottom-bar{flex-direction:column;align-items:flex-start}
  .back-home-link{width:100%;justify-content:center}
  .article-cta{padding-bottom:70px}
  .article-cta-inner h2{font-size:1.3rem}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1}
  .back-to-top{right:16px;bottom:16px}
}

/* roulang page: category1 */
:root {
  --bg: #080D18;
  --bg-soft: #111826;
  --bg-deep: #050810;
  --card: rgba(17, 24, 38, 0.74);
  --card-hover: rgba(22, 32, 50, 0.88);
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --text: #EAF2FF;
  --muted: #9AAAC3;
  --dim: #6D7B91;
  --accent: #35D0FA;
  --accent-deep: #1E6FFF;
  --amber: #FFB84D;
  --green: #4ADE80;
  --radius-lg: 24px;
  --radius-md: 15px;
  --radius-sm: 10px;
  --shadow-lg: 0 32px 70px rgba(0, 0, 0, 0.42);
  --shadow-md: 0 16px 36px rgba(0, 0, 0, 0.26);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  --header-height: 76px;
  --container: 1200px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(ellipse at 12% 12%, rgba(53, 208, 250, 0.06) 0%, transparent 60%), radial-gradient(ellipse at 88% 22%, rgba(255, 184, 77, 0.045) 0%, transparent 40%), radial-gradient(ellipse at 50% 90%, rgba(30, 111, 255, 0.08) 0%, transparent 55%);
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font-family: inherit;
}
h1, h2, h3, h4, p, ul {
  margin: 0;
}
ul {
  padding: 0;
  list-style: none;
}
::selection {
  background: rgba(53, 208, 250, 0.25);
  color: #fff;
}
::-webkit-scrollbar {
  width: 9px;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.14);
  border-radius: 99px;
}
::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.02);
}
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  z-index: 1;
}
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 999;
  display: flex;
  align-items: center;
  transition: background 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.site-header.scrolled {
  background: rgba(8, 13, 24, 0.82);
  border-bottom-color: var(--line);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}
.header-inner {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 13px;
  background: linear-gradient(145deg, rgba(53, 208, 250, 0.16), rgba(30, 111, 255, 0.1));
  border: 1px solid rgba(53, 208, 250, 0.34);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14), 0 10px 18px rgba(0, 0, 0, 0.2);
  color: var(--accent);
}
.brand-mark i {
  font-style: normal;
}
.brand-name {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: #fff;
  text-shadow: 0 0 18px rgba(53, 208, 250, 0.2);
}
.brand-name span {
  color: var(--accent);
  margin-left: 3px;
}
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.site-nav .nav-link {
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--muted);
  position: relative;
  transition: color 0.25s ease, background 0.25s ease, transform 0.2s ease;
}
.site-nav .nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}
.site-nav .nav-link.active {
  color: #fff;
  font-weight: 600;
}
.site-nav .nav-link.active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  border-radius: 99px;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(53, 208, 250, 0.72);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 17px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #07111B;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 110%);
  border: none;
  box-shadow: 0 8px 22px rgba(30, 111, 255, 0.2);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.25s ease;
}
.header-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(53, 208, 250, 0.32);
}
.menu-toggle {
  display: none;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  height: 40px;
  width: 40px;
  border-radius: 12px;
  color: var(--text);
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
}
.category-hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: 160px 0 90px;
  overflow: hidden;
}
.category-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(8, 13, 24, 0.15), rgba(8, 13, 24, 0.62) 88%), url("/assets/images/backpic/back-1.webp") center / cover no-repeat, linear-gradient(180deg, rgba(8, 13, 24, 0.12), rgba(8, 13, 24, 0.75));
  z-index: 0;
}
.category-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at center, #000 20%, transparent 82%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  color: #DDF6FF;
  background: rgba(53, 208, 250, 0.1);
  border: 1px solid rgba(53, 208, 250, 0.18);
  border-radius: 999px;
  font-size: 0.83rem;
  font-weight: 500;
  margin-bottom: 22px;
}
.hero-kicker i {
  font-style: normal;
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(53, 208, 250, 0.88);
}
.hero-title {
  font-size: clamp(2.4rem, 4.6vw, 3.5rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: #f4f9ff;
  margin-bottom: 18px;
}
.hero-title em {
  font-style: normal;
  color: var(--accent);
  position: relative;
  white-space: nowrap;
}
.hero-sub {
  color: #C7D3E5;
  font-size: 1.04rem;
  max-width: 520px;
  margin-bottom: 30px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border-radius: 14px;
  font-weight: 600;
  font-size: 0.94rem;
  border: none;
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.3s ease, background 0.22s ease;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 125%);
  color: #041019;
  box-shadow: 0 14px 24px rgba(19, 125, 255, 0.22);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 38px rgba(53, 208, 250, 0.3);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  color: #E3EDFA;
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.btn-ghost:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(53, 208, 250, 0.5);
  box-shadow: 0 14px 24px rgba(0, 0, 0, 0.24);
}
.hero-trust {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  font-size: 0.76rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 999px;
}
.hero-trust i {
  font-style: normal;
  color: var(--green);
}
.hero-visual {
  position: relative;
  perspective: 1200px;
}
.hero-card-stack {
  position: relative;
  padding: 16px;
  background: linear-gradient(160deg, rgba(20, 28, 45, 0.92), rgba(10, 16, 28, 0.9));
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 34px;
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  max-width: 440px;
  margin-left: auto;
  backdrop-filter: blur(12px);
}
.hero-card-stack::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  bottom: -40px;
  left: -70px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 184, 77, 0.16) 0%, transparent 60%);
  filter: blur(30px);
  pointer-events: none;
}
.hero-frame {
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  background: #0e1727;
  border: 1px solid var(--line);
}
.hero-frame img {
  width: 100%;
  aspect-ratio: 4 / 4.5;
  object-fit: cover;
  opacity: 0.9;
}
.hero-frame-tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: rgba(5, 10, 18, 0.72);
  backdrop-filter: blur(8px);
  padding: 18px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.hero-frame-tag strong {
  font-size: 0.95rem;
  color: var(--text);
  display: block;
  line-height: 1.35;
}
.hero-frame-tag small {
  color: var(--muted);
  font-size: 0.76rem;
  display: block;
  margin-top: 2px;
}
.float-badge {
  position: absolute;
  top: 22px;
  right: -18px;
  background: rgba(22, 32, 45, 0.9);
  border: 1px solid rgba(255, 184, 77, 0.34);
  color: var(--amber);
  padding: 8px 14px;
  border-radius: 14px;
  font-size: 0.78rem;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  gap: 6px;
  backdrop-filter: blur(8px);
}
.hero-float-card {
  position: absolute;
  bottom: 54px;
  left: -40px;
  background: rgba(17, 24, 38, 0.9);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  border-radius: 16px;
  padding: 12px 16px;
  color: var(--muted);
  font-size: 0.78rem;
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  gap: 10px;
}
.hero-float-card i {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: rgba(53, 208, 250, 0.85);
  box-shadow: 0 0 12px rgba(53, 208, 250, 0.7);
}
.section {
  padding: 100px 0;
  position: relative;
  z-index: 2;
}
.section-head {
  max-width: 760px;
  margin: 0 auto 50px;
  text-align: center;
}
.section-kicker {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.section-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent));
}
.section-kicker::after {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), transparent);
}
.section-title {
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  line-height: 1.35;
  color: #f0f6ff;
  margin-bottom: 16px;
}
.section-desc {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.85;
}
.quick-anchor {
  position: relative;
  z-index: 10;
  margin-top: -34px;
  margin-bottom: 20px;
  background: rgba(10, 16, 26, 0.76);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px);
  border-radius: 22px;
  box-shadow: var(--shadow-md);
  padding: 22px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
}
.quick-anchor a {
  padding: 8px 14px;
  color: var(--muted);
  border-radius: 999px;
  font-size: 0.88rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.02);
  transition: all 0.2s ease;
}
.quick-anchor a:hover {
  color: var(--accent);
  border-color: rgba(53, 208, 250, 0.35);
  background: rgba(53, 208, 250, 0.06);
}
.split-block {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 70px;
}
.split-block:last-child {
  margin-bottom: 0;
}
.split-media {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 12px;
  overflow: hidden;
  transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
}
.split-media:hover {
  transform: translateY(-6px) rotate(0.5deg);
  box-shadow: var(--shadow-lg);
  border-color: rgba(53, 208, 250, 0.28);
}
.split-media img {
  border-radius: 16px;
  width: 100%;
  aspect-ratio: 5 / 4;
  object-fit: cover;
}
.split-media::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 16px;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 54%, rgba(6, 10, 18, 0.36));
}
.copy-index {
  display: inline-flex;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  background: linear-gradient(150deg, rgba(53, 208, 250, 0.16), rgba(30, 111, 255, 0.08));
  border: 1px solid rgba(53, 208, 250, 0.32);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  color: var(--accent);
  justify-content: center;
  align-items: center;
}
.split-block h2 {
  font-size: clamp(1.45rem, 2.4vw, 2.1rem);
  line-height: 1.4;
  margin-bottom: 14px;
}
.copy-lead {
  color: var(--muted);
  margin-bottom: 24px;
}
.check-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: #DCE6F4;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 13px 16px;
  line-height: 1.6;
}
.check-list li i {
  font-style: normal;
  display: inline-flex;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  margin-top: 3px;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  background: rgba(53, 208, 250, 0.1);
  border: 1px solid rgba(53, 208, 250, 0.2);
  font-weight: 700;
  font-size: 0.72rem;
}
.check-list strong {
  display: block;
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
}
.check-list small {
  display: block;
  color: var(--muted);
  line-height: 1.7;
}
.route-step {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 30px;
  grid-column: span 2;
  margin-top: 10px;
}
.route-step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.step-chip {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  position: relative;
  overflow: hidden;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}
.step-chip:hover {
  background: rgba(53, 208, 250, 0.06);
  border-color: rgba(53, 208, 250, 0.28);
  transform: translateY(-4px);
}
.step-chip:nth-child(2) {
  transform: translateY(10px);
}
.step-chip:nth-child(2):hover {
  transform: translateY(6px);
}
.step-chip .step-num {
  display: inline-flex;
  width: 30px;
  height: 30px;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.78rem;
  background: rgba(255, 184, 77, 0.1);
  border: 1px solid rgba(255, 184, 77, 0.22);
  color: var(--amber);
  border-radius: 10px;
  margin-bottom: 13px;
}
.step-chip h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: #F0F6FF;
}
.step-chip p {
  color: var(--muted);
  font-size: 0.92rem;
}
.guide-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 12px;
}
.guide-card {
  background: rgba(19, 26, 42, 0.72);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  padding: 26px 22px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: all 0.3s ease;
}
.guide-card:hover {
  border-color: rgba(53, 208, 250, 0.22);
  background: rgba(23, 33, 51, 0.84);
  transform: translateY(-5px);
}
.guide-card .card-ico {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--accent);
  background: rgba(53, 208, 250, 0.1);
  border: 1px solid rgba(53, 208, 250, 0.14);
  font-style: normal;
  font-weight: 700;
}
.guide-card:nth-child(2) .card-ico {
  color: var(--amber);
  background: rgba(255, 184, 77, 0.08);
  border-color: rgba(255, 184, 77, 0.16);
}
.guide-card:nth-child(3) .card-ico {
  color: var(--green);
  background: rgba(74, 222, 128, 0.08);
  border-color: rgba(74, 222, 128, 0.14);
}
.guide-card h3 {
  font-size: 1.02rem;
  margin-bottom: 8px;
}
.guide-card p {
  color: var(--muted);
  font-size: 0.9rem;
}
.guide-card a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--accent);
  font-size: 0.85rem;
  margin-top: 18px;
  font-weight: 500;
  transition: gap 0.2s ease;
}
.guide-card a:hover {
  gap: 9px;
}
.faq-block {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-top: 32px;
}
.faq-item {
  background: rgba(18, 25, 40, 0.7);
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  transition: border-color 0.25s ease, background 0.25s ease;
}
.faq-item:hover {
  border-color: rgba(53, 208, 250, 0.22);
}
.faq-item.open {
  border-color: rgba(53, 208, 250, 0.28);
  background: rgba(20, 29, 46, 0.86);
}
.faq-q {
  width: 100%;
  background: transparent;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 19px 22px;
  cursor: pointer;
  min-height: 60px;
  color: var(--text);
  font-weight: 600;
  font-size: 1rem;
  gap: 20px;
  transition: background 0.2s ease;
}
.faq-q:hover {
  background: rgba(255, 255, 255, 0.02);
}
.faq-icon {
  position: relative;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  transition: transform 0.3s ease, background 0.3s ease;
}
.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 1.6px;
  background: var(--muted);
  transform: translate(-50%, -50%);
  border-radius: 10px;
}
.faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: rgba(53, 208, 250, 0.08);
  border-color: rgba(53, 208, 250, 0.3);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s ease;
}
.faq-inner {
  padding: 0 24px 20px;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.9;
  border-top: 1px solid transparent;
}
.faq-item.open .faq-inner {
  border-top-color: rgba(255, 255, 255, 0.06);
}
.cta-zone {
  position: relative;
  z-index: 2;
  padding: 40px 0 0;
}
.cta-panel {
  position: relative;
  overflow: hidden;
  background: rgba(13, 20, 33, 0.88);
  backdrop-filter: blur(15px);
  border: 1px solid rgba(53, 208, 250, 0.22);
  border-radius: 28px;
  padding: 58px 46px;
  box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  text-align: center;
}
.cta-panel::before {
  content: "";
  position: absolute;
  right: -10%;
  top: -70%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(53, 208, 250, 0.1) 0%, transparent 55%);
  pointer-events: none;
}
.cta-panel::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -90%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(255, 184, 77, 0.1) 0%, transparent 60%);
  pointer-events: none;
}
.cta-panel h2 {
  font-size: clamp(1.4rem, 2.4vw, 2.1rem);
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}
.cta-panel p {
  color: var(--muted);
  margin-bottom: 30px;
  max-width: 620px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
  z-index: 1;
}
.cta-btns {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.site-footer {
  position: relative;
  z-index: 2;
  margin-top: 70px;
  background: linear-gradient(180deg, rgba(9, 14, 24, 0.96), #04070c);
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding: 70px 0 30px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.5fr;
  gap: 42px;
}
.footer-brand-title {
  color: #EEF6FF;
  font-weight: 700;
  font-size: 1.2rem;
}
.footer-brand-desc {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.9;
  margin: 14px 0 18px;
}
.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--green);
  font-size: 0.8rem;
}
.footer-title {
  font-size: 0.95rem;
  color: #d7e4f1;
  font-weight: 600;
  margin-bottom: 17px;
}
.footer-link-item {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 10px;
  transition: color 0.22s ease, transform 0.22s ease;
}
.footer-link-item:hover {
  color: var(--accent);
  transform: translateX(3px);
}
.footer-link-item i {
  font-style: normal;
  color: var(--dim);
  font-size: 0.82rem;
}
.footer-bottom {
  max-width: 1200px;
  margin: 64px auto 0;
  padding: 22px 32px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--dim);
  font-size: 0.82rem;
}
.footer-bottom .list-separator {
  width: 1px;
  height: 12px;
  display: inline-block;
  margin: 0 8px;
  background: rgba(255, 255, 255, 0.12);
  vertical-align: middle;
}
.back-top-btn {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: rgba(18, 26, 40, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--accent);
  font-size: 1.2rem;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: transform 0.2s, border-color 0.2s, opacity 0.3s;
  z-index: 900;
}
.back-top-btn:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 208, 250, 0.4);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}
.fa-angle-right::before {
  content: "\203A";
  font-style: normal;
  font-weight: 700;
}
.fa-circle::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(74, 222, 128, 0.7);
  vertical-align: middle;
}
.fa-bolt::before {
  content: "\26A1";
  font-style: normal;
  color: var(--accent);
  font-size: 18px;
}
.fa-arrow-circle-right::before {
  content: "\2192";
  font-style: normal;
  font-weight: 700;
  margin-right: 4px;
}
@media (max-width: 1080px) {
  .guide-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-card-stack {
    max-width: 380px;
  }
  .header-actions .header-cta {
    display: none;
  }
  .split-block {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 860px) {
  .header-inner {
    padding: 0 20px;
  }
  .site-nav {
    display: none;
    position: fixed;
    top: calc(var(--header-height) - 4px);
    left: 0;
    right: 0;
    background: rgba(9, 14, 24, 0.96);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 8px 20px 18px;
    flex-direction: column;
    align-items: stretch;
    margin: 0;
    gap: 4px;
    box-shadow: 0 18px 28px rgba(0, 0, 0, 0.3);
    z-index: 998;
  }
  .site-nav.open {
    display: flex;
  }
  .site-nav .nav-link {
    padding: 13px 14px;
    border-radius: 12px;
    text-align: center;
    font-size: 1rem;
  }
  .menu-toggle {
    display: inline-flex;
    margin-left: auto;
  }
  .category-hero {
    padding: 150px 0 60px;
    min-height: auto;
  }
  .hero-inner {
    grid-template-columns: 1fr;
    padding: 0 20px;
    gap: 50px;
  }
  .hero-card-stack {
    max-width: 100%;
    margin: 0 auto;
  }
  .hero-float-card {
    left: 8px;
  }
  .route-step-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .step-chip:nth-child(2),
  .step-card:nth-child(2) {
    transform: none;
  }
  .step-chip:nth-child(2):hover {
    transform: translateY(-4px);
  }
  .quick-anchor {
    margin-top: 0;
  }
}
@media (max-width: 680px) {
  .container,
  .header-inner,
  .hero-inner,
  .footer-inner,
  .footer-bottom {
    padding-left: 18px;
    padding-right: 18px;
  }
  .site-header {
    height: 68px;
  }
  .brand-name {
    font-size: 1.1rem;
  }
  .brand-mark {
    width: 34px;
    height: 34px;
  }
  .section {
    padding: 64px 0;
  }
  .hero-title {
    font-size: 2.2rem;
    line-height: 1.3;
  }
  .hero-title em {
    white-space: normal;
  }
  .category-hero {
    padding-top: 100px;
  }
  .split-media {
    padding: 6px;
  }
  .guide-cards {
    grid-template-columns: 1fr;
  }
  .cta-panel {
    padding: 34px 20px;
    border-radius: 22px;
  }
  .route-step {
    padding: 20px 16px;
  }
  .faq-a .faq-inner {
    padding: 0 16px 16px;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 26px;
  }
  .footer-bottom {
    font-size: 0.76rem;
  }
  .back-top-btn {
    right: 14px;
    bottom: 16px;
  }
}

/* roulang page: category2 */
:root {
  --bg: #0b0f1a;
  --bg-2: #101826;
  --panel: rgba(15, 24, 42, 0.86);
  --panel-2: #141e31;
  --glass: rgba(255, 255, 255, 0.055);
  --accent: #35d0fa;
  --accent-2: #2f6bff;
  --amber: #ffb84d;
  --green: #4ade80;
  --text: #e8f1ff;
  --muted: #a0b2cb;
  --dim: #7286a6;
  --border: rgba(255, 255, 255, 0.09);
  --border-bright: rgba(53, 208, 250, 0.45);
  --radius-lg: 24px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.38);
  --container: 1200px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle at 18% 0%, rgba(53, 208, 250, 0.16), transparent 28%),
    radial-gradient(circle at 90% 8%, rgba(255, 184, 77, 0.1), transparent 22%),
    linear-gradient(135deg, rgba(53, 208, 250, 0.025) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.16;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { font-family: inherit; border: 0; background: none; color: inherit; cursor: pointer; }
input:focus-visible, button:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #0a0e18; }
::-webkit-scrollbar-thumb { background: #243247; border-radius: 20px; }

.container {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.site-header {
  position: fixed;
  top: 0; left: 0; width: 100%;
  height: 76px;
  z-index: 100;
  display: flex;
  align-items: center;
  background: rgba(7, 11, 20, 0.36);
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s, box-shadow 0.35s;
}
.site-header.scrolled {
  background: rgba(9, 14, 26, 0.84);
  backdrop-filter: blur(18px);
  border-bottom-color: rgba(53, 208, 250, 0.16);
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.3);
}
.header-inner {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
}
.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  color: #071422;
  background: linear-gradient(135deg, var(--accent), #1b64ff);
  box-shadow: 0 0 0 1px rgba(53, 208, 250, 0.4), 0 8px 20px rgba(53, 208, 250, 0.28);
  font-size: 18px;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-cn {
  color: var(--text);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.2px;
  white-space: nowrap;
}
.brand-en { color: var(--dim); font-size: 10px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; }
.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 13px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14.5px;
  font-weight: 600;
  transition: color 0.3s var(--ease), background 0.3s;
}
.nav-link:hover { color: var(--text); background: rgba(255, 255, 255, 0.06); }
.nav-link.active { color: var(--accent); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 18px; right: 18px; bottom: 1px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
  box-shadow: 0 0 10px rgba(53, 208, 250, 0.6);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.mega-wrap { position: relative; }
.mega-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  height: 42px;
  padding: 0 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.3s, box-shadow 0.3s;
}
.mega-btn:hover { background: rgba(53, 208, 250, 0.1); box-shadow: 0 0 0 3px rgba(53, 208, 250, 0.08); }
.mega-panel {
  position: absolute;
  top: calc(100% + 20px);
  right: 0;
  width: 740px;
  max-width: calc(100vw - 32px);
  background: rgba(10, 16, 29, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 22px;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 18px;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.28s var(--ease);
}
.mega-panel::after {
  content: "";
  position: absolute;
  top: -8px;
  right: 26px;
  width: 14px; height: 14px;
  background: inherit;
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  transform: rotate(45deg);
}
.mega-wrap:hover .mega-panel,
.mega-wrap:focus-within .mega-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.mega-title {
  font-size: 13px;
  color: var(--dim);
  letter-spacing: 1px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.mega-link {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--muted);
  font-size: 14px;
  transition: background 0.25s, color 0.25s;
}
.mega-link i { color: var(--accent); margin-top: 3px; width: 16px; text-align: center; }
.mega-link:hover { background: rgba(255, 255, 255, 0.05); color: var(--text); }
.mega-badge {
  color: var(--amber);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1px;
  border: 1px solid rgba(255, 184, 77, 0.35);
  border-radius: 999px;
  padding: 1px 8px;
  margin-left: 6px;
}
.mega-card {
  background: linear-gradient(145deg, rgba(53, 208, 250, 0.1), rgba(47, 107, 255, 0.08));
  border: 1px solid rgba(53, 208, 250, 0.16);
  border-radius: 16px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.mega-card strong { font-size: 16px; margin-bottom: 8px; }
.mega-card p { color: var(--muted); font-size: 13px; margin-bottom: 14px; }
.header-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(53, 208, 250, 0.18), rgba(47, 107, 255, 0.16));
  border: 1px solid rgba(53, 208, 250, 0.25);
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  transition: all 0.25s;
}
.header-cta-btn:hover { background: var(--accent); color: #04121c; box-shadow: 0 10px 28px rgba(53, 208, 250, 0.28); }
.nav-toggle, .drawer-mask { display: none; }

/* hero */
.cat-hero {
  position: relative;
  padding: 190px 0 84px;
  background:
    linear-gradient(to bottom, rgba(10, 15, 26, 0.68), rgba(10, 15, 26, 0.94) 74%),
    url("/assets/images/backpic/back-2.png") center 20% / cover no-repeat;
  border-bottom: 1px solid var(--border);
}
.cat-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(53, 208, 250, 0.4), transparent);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  align-items: center;
  gap: 56px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 20px;
  color: var(--dim);
  font-size: 12px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--muted); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--dim); }
.cat-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(53, 208, 250, 0.1);
  border: 1px solid rgba(53, 208, 250, 0.2);
  border-radius: 999px;
  padding: 5px 12px 5px 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.4px;
  margin-bottom: 22px;
}
.status-dot {
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.15);
}
.cat-hero h1 {
  font-size: 46px;
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.4px;
  color: #fff;
  max-width: 720px;
}
.cat-hero h1 .hl { color: var(--accent); }
.cat-hero-desc {
  color: var(--muted);
  font-size: 16.5px;
  line-height: 1.85;
  max-width: 660px;
  margin: 22px 0 32px;
}
.hero-btn-row { display: flex; flex-wrap: wrap; gap: 14px; }
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 50px;
  padding: 0 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  transition: all 0.28s var(--ease);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #1b64ff);
  color: #07111d;
  box-shadow: 0 10px 30px rgba(53, 208, 250, 0.22);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px rgba(53, 208, 250, 0.35); }
.btn-secondary {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: #dce7f5;
}
.btn-secondary:hover { border-color: rgba(53, 208, 250, 0.35); color: var(--accent); background: rgba(53, 208, 250, 0.06); }
.hero-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 28px;
  color: var(--dim);
  font-size: 13px;
}
.hero-trust i { color: var(--accent); margin-right: 5px; }
.hero-panel {
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: linear-gradient(145deg, rgba(20, 30, 47, 0.9), rgba(12, 19, 32, 0.9));
  border-radius: 26px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
  padding: 26px;
  overflow: hidden;
}
.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(53, 208, 250, 0.5), transparent);
}
.hero-panel-top {
  display: flex;
  gap: 12px;
  margin-bottom: 22px;
}
.hero-panel-top div { flex: 1; background: var(--glass); border: 1px solid var(--border); border-radius: 14px; padding: 13px 16px; }
.hero-panel-top small { display: block; color: var(--dim); font-size: 12px; margin-bottom: 4px; }
.hero-panel-top strong { font-size: 15px; color: #fff; letter-spacing: 0.3px; }
.hero-panel-visual {
  display: grid;
  gap: 12px;
}
.hero-mini-row {
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 11px 12px;
  transition: border-color 0.3s;
}
.hero-mini-row:hover { border-color: rgba(53, 208, 250, 0.35); }
.mini-thumb {
  width: 62px;
  height: 42px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}
.mini-row-body { flex: 1; min-width: 0; line-height: 1.3; }
.mini-row-body strong { display: block; color: #e6efff; font-size: 14px; margin-bottom: 3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mini-row-body span { color: var(--dim); font-size: 12px; }
.mini-row-icon { color: var(--accent); font-size: 18px; }

/* quick strip */
.quick-strip {
  padding: 36px 0 48px;
}
.quick-strip .container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.quick-pill {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--border);
  border-radius: 18px;
  transition: all 0.25s;
}
.quick-pill:hover { background: rgba(53, 208, 250, 0.07); border-color: rgba(53, 208, 250, 0.3); transform: translateY(-2px); }
.quick-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(53, 208, 250, 0.1);
  color: var(--accent);
  font-size: 17px;
  border: 1px solid rgba(53, 208, 250, 0.18);
  flex-shrink: 0;
}
.quick-pill strong { font-size: 15px; color: #eaf3ff; }
.quick-pill span { font-size: 13px; color: var(--dim); }

/* content + sidebar */
.content-section {
  padding: 78px 0 60px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}
.index-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 44px;
  align-items: start;
}
.section-heading { margin-bottom: 34px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 9px;
}
.section-heading .line { display: inline-block; width: 27px; height: 2px; background: var(--accent); border-radius: 2px; }
.section-heading h2 {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.3px;
  color: #fff;
}
.section-heading p { color: var(--muted); margin-top: 10px; max-width: 700px; }

.chapter-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 22px 24px;
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 20px;
  margin-bottom: 28px;
  backdrop-filter: blur(12px);
  transition: border-color 0.3s, transform 0.3s;
  position: relative;
  overflow: hidden;
}
.chapter-card::after {
  content: "";
  position: absolute;
  right: -32px;
  top: -44px;
  width: 150px;
  height: 150px;
  background: radial-gradient(circle, rgba(53, 208, 250, 0.08), transparent 66%);
  pointer-events: none;
}
.chapter-card:hover { border-color: rgba(53, 208, 250, 0.26); transform: translateY(-2px); }
.chapter-num {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(53, 208, 250, 0.18), rgba(47, 107, 255, 0.12));
  border: 1px solid rgba(53, 208, 250, 0.24);
  color: var(--accent);
  font-size: 19px;
  font-weight: 800;
  display: grid;
  place-items: center;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
.chapter-main h3 { font-size: 21px; color: #fff; font-weight: 750; margin: 4px 0 8px; }
.chapter-main p { color: var(--muted); font-size: 15px; margin-bottom: 15px; max-width: 720px; }
.chapter-list-feature {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin-bottom: 14px;
}
.chapter-list-feature li {
  color: #b9c7dc;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 13px;
  font-size: 13px;
}
.chapter-main .tag-more { color: var(--accent); font-size: 13.5px; font-weight: 600; display: inline-flex; gap: 6px; margin-top: 4px; }
.chapter-main .tag-more:hover { text-shadow: 0 0 12px rgba(53, 208, 250, 0.5); }
.chapter-image-note {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 16px;
}
.chapter-image-note img {
  width: 142px;
  height: 78px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}
.chapter-image-note span { font-size: 13px; color: var(--dim); line-height: 1.5; }

.chapter-cta {
  margin-top: 20px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  padding: 12px 16px;
  border: 1px solid rgba(53, 208, 250, 0.18);
  border-radius: 999px;
  background: rgba(53, 208, 250, 0.06);
  transition: all 0.25s;
}
.text-link:hover { background: rgba(53, 208, 250, 0.13); box-shadow: 0 0 0 3px rgba(53, 208, 250, 0.06); transform: translateY(-1px); }
.text-link.secondary { color: var(--muted); border-color: var(--border); background: rgba(255, 255, 255, 0.03); }
.text-link.secondary:hover { color: #fff; border-color: rgba(255, 255, 255, 0.3); }

/* aside */
.side-sticky {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.rail-card {
  background: rgba(14, 22, 38, 0.92);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 22px;
  border-top: 2px solid rgba(53, 208, 250, 0.7);
}
.rail-title {
  font-size: 15px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 750;
  margin-bottom: 6px;
}
.rail-remark { color: var(--dim); font-size: 12.5px; margin-bottom: 16px; line-height: 1.55; }
.rail-list { display: flex; flex-direction: column; gap: 4px; }
.rail-link {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--muted);
  font-size: 14px;
  padding: 9px 8px;
  border-radius: 10px;
  transition: all 0.2s;
  border-left: 2px solid transparent;
}
.rail-link i { color: var(--dim); font-size: 12px; width: 16px; }
.rail-link:hover, .rail-link.active { background: rgba(53, 208, 250, 0.07); color: var(--accent); border-left-color: var(--accent); }
.rail-card-note {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--dim);
  font-size: 13px;
  line-height: 1.7;
}
.rail-card-note strong { color: var(--amber); font-weight: 600; }

.guide-quote {
  background: linear-gradient(145deg, rgba(255, 184, 77, 0.07), rgba(255, 159, 74, 0.04));
  border: 1px solid rgba(255, 184, 77, 0.18);
  border-radius: 22px;
  padding: 22px;
  position: relative;
}
.guide-quote .quote-mark { color: var(--amber); font-size: 22px; margin-bottom: 10px; opacity: 0.8; }
.guide-quote p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.guide-quote span { color: var(--dim); display: block; margin-top: 12px; font-size: 12.5px; }

/* faq */
.faq-section {
  padding: 78px 0 84px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.faq-wrap {
  margin-top: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.faq-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.3s;
}
.faq-item:hover { border-color: rgba(53, 208, 250, 0.26); }
.faq-item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 17px 20px;
  color: #eaf1ff;
  font-size: 15px;
  font-weight: 700;
  min-height: 56px;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-icon {
  width: 25px;
  height: 25px;
  border-radius: 9px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent);
  flex-shrink: 0;
  font-size: 12px;
  transition: transform 0.35s var(--ease), background 0.3s;
}
.faq-item[open] .faq-icon {
  transform: rotate(135deg);
  background: rgba(53, 208, 250, 0.15);
  border-color: rgba(53, 208, 250, 0.3);
}
.faq-ans {
  padding: 0 20px 20px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.85;
  border-top: 1px solid var(--border);
  margin: 0;
}
.faq-ans p { padding-top: 19px; }

/* CTA */
.cta-section { padding: 70px 0; }
.cta-banner {
  border-radius: 32px;
  overflow: hidden;
  position: relative;
  background:
    linear-gradient(135deg, rgba(13, 23, 42, 0.96), rgba(8, 16, 32, 0.97)),
    url("/assets/images/backpic/back-1.webp") center / cover;
  padding: 72px 50px;
  border: 1px solid var(--border);
  text-align: center;
}
.cta-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 70% 10%, rgba(53, 208, 250, 0.15), transparent 32%);
  pointer-events: none;
}
.cta-banner h2 {
  font-size: 34px;
  color: #fff;
  font-weight: 800;
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}
.cta-banner h2 span { color: var(--accent); }
.cta-banner p {
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 30px;
  font-size: 15px;
  position: relative;
  z-index: 1;
}
.cta-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}
.cta-caption {
  color: var(--dim);
  font-size: 13px;
  margin-top: 22px;
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* footer */
.site-footer {
  background: #080d17;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 52px 0 0;
  position: relative;
  z-index: 2;
}
.footer-inner {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 40px;
  padding-bottom: 38px;
}
.brand-col .brand { margin-bottom: 14px; }
.footer-brand-title { color: #fff; font-size: 21px; font-weight: 800; }
.footer-brand-desc { color: var(--muted); font-size: 14px; max-width: 330px; margin-top: 8px; }
.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 15px;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.22);
  color: var(--green);
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 999px;
}
.footer-status .fa-circle { font-size: 6px; }
.footer-column .footer-title {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 15px;
}
.footer-link-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13.5px;
  padding: 5px 0;
  transition: color 0.2s, padding-left 0.2s;
}
.footer-link-item:hover { color: var(--accent); padding-left: 3px; }
.footer-link-item i { color: var(--dim); font-size: 11px; }
.footer-bottom {
  border-top: 1px solid var(--border);
}
.footer-bottom-inner {
  width: min(var(--container), calc(100% - 32px));
  margin: 0 auto;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--dim);
  font-size: 13px;
  padding: 12px 0;
}
.footer-bottom a { color: var(--muted); }
.footer-bottom a:hover { color: var(--accent); }
.back-top-btn {
  position: fixed;
  right: 22px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  background: linear-gradient(145deg, var(--accent), #2869ff);
  color: #07111d;
  font-size: 17px;
  border: none;
  display: grid;
  place-items: center;
  box-shadow: 0 12px 30px rgba(53, 208, 250, 0.4);
  z-index: 70;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
}
.back-top-btn.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top-btn:hover { transform: translateY(-3px); box-shadow: 0 18px 38px rgba(53, 208, 250, 0.5); }

/* responsive */
@media (max-width: 1120px) {
  .site-nav { display: none; }
  .nav-toggle { display: inline-flex; width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 13px; align-items: center; justify-content: center; color: var(--text); background: rgba(255,255,255,0.04); }
  .site-header { position: fixed; }
  .nav-toggle .open-icon { display: block; }
  body.drawer-open .nav-toggle .open-icon { display: none; }
  .site-header .site-nav {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: min(86vw, 360px);
    background: rgba(8, 13, 24, 0.98);
    backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 12px;
    border-left: 1px solid var(--border);
    padding: 80px 20px 40px;
    transition: right 0.35s var(--ease);
    z-index: 150;
  }
  body.drawer-open .site-header .site-nav { display: flex; right: 0; }
  .site-nav .nav-link { height: 50px; width: 100%; justify-content: flex-start; padding: 0 20px; font-size: 17px; }
  .site-nav .nav-link.active::after { left: 20px; right: auto; width: 40px; }
  .drawer-mask { display: block; position: fixed; inset: 0; background: rgba(2, 6, 12, 0.62); backdrop-filter: blur(2px); opacity: 0; visibility: hidden; transition: opacity 0.3s; z-index: 120; }
  body.drawer-open .drawer-mask { opacity: 1; visibility: visible; }
  .mega-wrap { display: none; }
  .header-cta-btn { display: none; }
}
@media (max-width: 980px) {
  .hero-grid, .index-grid { grid-template-columns: 1fr; }
  .cat-hero { padding: 148px 0 64px; }
  .cat-hero h1 { font-size: 38px; }
  .quick-strip .container { grid-template-columns: 1fr; }
  .side-sticky { position: static; }
  .sidebar-rail { display: none; }
  .faq-wrap { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .container { width: calc(100% - 28px); }
  .site-header, .header-inner { min-height: 66px; height: 66px; }
  .brand-mark { width: 38px; height: 38px; }
  .brand-cn { font-size: 16px; }
  .cat-hero h1 { font-size: 31px; line-height: 1.3; }
  .cat-hero-desc { font-size: 15px; }
  .hero-btn-row .btn-primary, .hero-btn-row .btn-secondary { width: 100%; }
  .chapter-card { grid-template-columns: 48px 1fr; gap: 14px; padding: 18px; }
  .chapter-num { width: 44px; height: 44px; }
  .chapter-card { margin-bottom: 16px; }
  .section-heading h2 { font-size: 27px; }
  .cta-banner { padding: 50px 24px; }
  .cta-banner h2 { font-size: 26px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom-inner { justify-content: center; text-align: center; }
  .back-top-btn { bottom: 18px; right: 18px; }
  .hero-panel { padding: 18px; }
  .hero-panel-top { flex-direction: column; }
}