/* roulang page: index */
:root {
            --color-primary: #1B4A3C;
            --color-primary-dark: #12392E;
            --color-primary-deeper: #0E241C;
            --color-accent: #E8932A;
            --color-accent-hover: #D97A1A;
            --color-bg: #F7F5F1;
            --color-surface: #FFFFFF;
            --color-text: #1D2B25;
            --color-muted: #54665E;
            --color-border: #E3DFD7;
            --color-success: #2E7D5B;
            --color-warning: #D97706;
            --color-on-dark: #FAF6EF;
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 10px;
            --shadow-weak: 0 1px 4px rgba(14, 36, 28, 0.05);
            --shadow-mid: 0 8px 24px rgba(14, 36, 28, 0.08);
            --shadow-cta: 0 6px 16px rgba(232, 147, 42, 0.28);
            --shadow-nav: 0 2px 12px rgba(14, 36, 28, 0.08);
            --ease: cubic-bezier(.4, 0, .2, 1);
            --container: 1200px;
            --section-gap: clamp(56px, 7vw, 96px);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color .24s var(--ease), background .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease), transform .24s var(--ease);
        }

        a:hover {
            color: var(--color-primary-dark);
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            transition: all .24s var(--ease);
        }

        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
        }

        input {
            font-family: inherit;
        }

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .section {
            padding-top: var(--section-gap);
            padding-bottom: var(--section-gap);
        }

        .section-title {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-text);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .section-title::before {
            content: "";
            width: 4px;
            height: 24px;
            background: var(--color-primary);
            border-radius: 4px;
            flex-shrink: 0;
        }

        .section-desc {
            color: var(--color-muted);
            font-size: 1rem;
            max-width: 640px;
            margin-bottom: 40px;
            line-height: 1.7;
        }

        /* ========== 顶部导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(247, 245, 241, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--color-border);
            transition: box-shadow .3s var(--ease);
        }

        .site-header.scrolled {
            box-shadow: var(--shadow-nav);
        }

        .header-top {
            height: 52px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid rgba(227, 223, 215, 0.6);
            transition: height .3s var(--ease);
        }

        .site-header.scrolled .header-top {
            height: 44px;
        }

        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .brand-logo {
            width: 32px;
            height: 32px;
            background: var(--color-primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-accent);
            font-weight: 800;
            font-size: 16px;
            flex-shrink: 0;
            position: relative;
        }

        .brand-logo::after {
            content: "";
            position: absolute;
            width: 6px;
            height: 6px;
            background: var(--color-accent);
            border-radius: 50%;
            bottom: 2px;
            right: 2px;
        }

        .brand-name {
            font-size: 18px;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.01em;
            line-height: 1.2;
        }

        .brand-sub {
            font-size: 12px;
            color: var(--color-muted);
            font-weight: 400;
            margin-left: 2px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .header-search-btn,
        .header-menu-btn {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-primary);
            background: transparent;
            border: 1px solid transparent;
        }

        .header-search-btn:hover,
        .header-menu-btn:hover {
            background: rgba(27, 74, 60, 0.06);
            border-color: var(--color-border);
        }

        .header-download-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            height: 36px;
            padding: 0 16px;
            background: var(--color-accent);
            color: var(--color-primary-deeper);
            font-size: 14px;
            font-weight: 600;
            border-radius: var(--radius-btn);
            box-shadow: 0 4px 12px rgba(232, 147, 42, 0.25);
        }

        .header-download-btn:hover {
            background: var(--color-accent-hover);
            color: var(--color-primary-deeper);
            transform: translateY(-2px);
        }

        .header-nav {
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            height: 100%;
        }

        .nav-links a {
            display: inline-flex;
            align-items: center;
            height: 100%;
            padding: 0 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            position: relative;
            white-space: nowrap;
        }

        .nav-links a::after {
            content: "";
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 0;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px 2px 0 0;
            opacity: 0;
            transform: scaleX(.5);
            transition: opacity .24s var(--ease), transform .24s var(--ease);
        }

        .nav-links a:hover {
            color: var(--color-primary);
        }

        .nav-links a.active {
            color: var(--color-primary);
            font-weight: 600;
        }

        .nav-links a.active::after {
            opacity: 1;
            transform: scaleX(1);
        }

        .header-hotwords {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .hotword-link {
            font-size: 13px;
            color: var(--color-muted);
            background: rgba(27, 74, 60, 0.06);
            border-radius: 999px;
            padding: 4px 14px;
            line-height: 1.6;
            border: 1px solid transparent;
        }

        .hotword-link:hover {
            color: var(--color-primary);
            border-color: var(--color-primary);
            background: rgba(27, 74, 60, 0.04);
        }

        /* 搜索面板 */
        .search-panel {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-nav);
            padding: 20px 0;
            z-index: 1001;
        }

        .search-panel.open {
            display: block;
        }

        .search-form {
            display: flex;
            gap: 10px;
            max-width: 680px;
            margin: 0 auto;
        }

        .search-form input {
            flex: 1;
            height: 44px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-input);
            padding: 0 18px;
            font-size: 15px;
            background: var(--color-bg);
            transition: border-color .24s var(--ease), box-shadow .24s var(--ease);
        }

        .search-form input:focus {
            outline: none;
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(27, 74, 60, 0.12);
        }

        .search-submit {
            height: 44px;
            padding: 0 24px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
        }

        .search-submit:hover {
            background: var(--color-primary-dark);
        }

        .search-hot {
            max-width: 680px;
            margin: 14px auto 0;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 13px;
            color: var(--color-muted);
            flex-wrap: wrap;
        }

        .search-hot a {
            color: var(--color-primary);
            font-weight: 500;
        }

        .search-hot a:hover {
            color: var(--color-accent-hover);
        }

        /* 移动端抽屉 */
        .mobile-menu {
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            height: 100%;
            background: var(--color-surface);
            z-index: 1100;
            box-shadow: -8px 0 30px rgba(14, 36, 28, 0.2);
            transition: right .3s var(--ease);
            padding: 30px 24px;
            overflow-y: auto;
        }

        .mobile-menu.open {
            right: 0;
        }

        .mobile-menu-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 30px;
        }

        .mobile-menu-close {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            color: var(--color-text);
            border: 1px solid var(--color-border);
        }

        .mobile-menu-links {
            list-style: none;
            margin-bottom: 24px;
        }

        .mobile-menu-links li {
            border-bottom: 1px solid var(--color-border);
        }

        .mobile-menu-links a {
            display: block;
            padding: 14px 0;
            font-size: 16px;
            font-weight: 500;
            color: var(--color-text);
        }

        .mobile-menu-links a.active {
            color: var(--color-primary);
            font-weight: 700;
        }

        .mobile-hotwords {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
        }

        .mobile-overlay {
            position: fixed;
            inset: 0;
            background: rgba(14, 36, 28, 0.45);
            z-index: 1050;
            opacity: 0;
            visibility: hidden;
            transition: opacity .3s var(--ease), visibility .3s var(--ease);
        }

        .mobile-overlay.open {
            opacity: 1;
            visibility: visible;
        }

        .header-menu-btn {
            display: none;
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            background: linear-gradient(100deg, var(--color-primary-deeper) 0%, var(--color-primary) 100%);
            overflow: hidden;
            min-height: 560px;
            display: flex;
            align-items: center;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
        }

        .hero::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(14, 36, 28, 0.86) 0%, rgba(14, 36, 28, 0.92) 100%);
            pointer-events: none;
        }

        .hero-inner {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 48px;
            padding-top: 72px;
            padding-bottom: 72px;
        }

        .hero-left {
            flex: 1 1 520px;
            max-width: 620px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(232, 147, 42, 0.15);
            border: 1px solid rgba(232, 147, 42, 0.4);
            color: var(--color-accent);
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            padding: 6px 16px;
            margin-bottom: 24px;
            letter-spacing: 0.02em;
        }

        .hero-badge i {
            width: 6px;
            height: 6px;
            background: var(--color-success);
            border-radius: 50%;
            display: inline-block;
        }

        .hero h1 {
            font-size: clamp(2.25rem, 5vw, 3.5rem);
            font-weight: 800;
            line-height: 1.12;
            letter-spacing: -0.02em;
            color: var(--color-on-dark);
            margin-bottom: 18px;
        }

        .hero h1 .accent {
            color: var(--color-accent);
            position: relative;
            display: inline-block;
        }

        .hero h1 .accent::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 2px;
            width: 100%;
            height: 4px;
            background: var(--color-accent);
            border-radius: 4px;
            opacity: .5;
        }

        .hero-sub {
            font-size: 16px;
            line-height: 1.7;
            color: rgba(250, 246, 239, 0.85);
            max-width: 480px;
            margin-bottom: 24px;
        }

        .hero-trust {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 32px;
        }

        .trust-item {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: rgba(250, 246, 239, 0.9);
        }

        .trust-item svg {
            width: 16px;
            height: 16px;
            color: var(--color-accent);
            flex-shrink: 0;
        }

        .hero-btns {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 48px;
            padding: 0 32px;
            background: var(--color-accent);
            color: var(--color-primary-deeper);
            font-size: 15px;
            font-weight: 700;
            border-radius: var(--radius-btn);
            box-shadow: var(--shadow-cta);
            transition: background .24s var(--ease), transform .24s var(--ease), box-shadow .24s var(--ease);
        }

        .btn-primary:hover {
            background: var(--color-accent-hover);
            color: var(--color-primary-deeper);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(232, 147, 42, 0.35);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-ghost-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 48px;
            padding: 0 28px;
            background: transparent;
            color: var(--color-on-dark);
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: 1px solid rgba(255, 255, 255, 0.5);
            transition: background .24s var(--ease), transform .24s var(--ease), border-color .24s var(--ease);
        }

        .btn-ghost-light:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            border-color: rgba(255, 255, 255, 0.8);
        }

        .btn-ghost-light:active {
            transform: scale(0.98);
        }

        .hero-right {
            flex: 0 1 420px;
            display: flex;
            justify-content: center;
        }

        .hero-app-card {
            width: 320px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border-radius: 16px;
            padding: 14px;
            box-shadow: 0 24px 60px rgba(14, 36, 28, 0.5);
            position: relative;
        }

        .hero-app-card::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -1px;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
            border-radius: 0 0 16px 16px;
        }

        .hero-app-card img {
            border-radius: 10px;
            width: 100%;
            aspect-ratio: 9/14;
            object-fit: cover;
            background: var(--color-primary-dark);
        }

        .hero-app-card-caption {
            text-align: center;
            color: rgba(250, 246, 239, 0.65);
            font-size: 13px;
            padding: 12px 0 6px;
        }

        /* ========== 合集目录 ========== */
        .catalog-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .catalog-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 160px;
            transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
            position: relative;
        }

        .catalog-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-mid);
            border-color: rgba(27, 74, 60, 0.4);
        }

        .catalog-top {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
        }

        .catalog-num {
            font-family: Georgia, "Times New Roman", serif;
            font-size: 32px;
            font-weight: 500;
            color: var(--color-primary);
            line-height: 1;
            opacity: 0.85;
        }

        .catalog-arrow {
            color: var(--color-muted);
            opacity: 0;
            transform: translateX(-8px);
            transition: opacity .24s var(--ease), transform .24s var(--ease);
        }

        .catalog-card:hover .catalog-arrow {
            opacity: 1;
            transform: translateX(0);
        }

        .catalog-name {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-text);
            margin-top: 16px;
            margin-bottom: 4px;
        }

        .catalog-desc {
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.6;
        }

        /* ========== 精选条目 ========== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-mid);
            border-color: rgba(27, 74, 60, 0.3);
        }

        .feature-cover {
            aspect-ratio: 16/10;
            overflow: hidden;
            background: var(--color-primary-dark);
        }

        .feature-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s var(--ease);
        }

        .feature-card:hover .feature-cover img {
            transform: scale(1.04);
        }

        .feature-body {
            padding: 20px;
        }

        .feature-badge {
            display: inline-block;
            background: rgba(232, 147, 42, 0.12);
            color: var(--color-warning);
            font-size: 12px;
            font-weight: 600;
            border-radius: 999px;
            padding: 3px 12px;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
        }

        .feature-title {
            font-size: 1.125rem;
            font-weight: 600;
            line-height: 1.4;
            color: var(--color-text);
            margin-bottom: 8px;
        }

        .feature-summary {
            font-size: 14px;
            color: var(--color-muted);
            line-height: 1.65;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 16px;
        }

        .feature-more {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            border-top: 1px solid var(--color-border);
            padding-top: 14px;
        }

        .feature-more:hover {
            color: var(--color-accent-hover);
            gap: 10px;
        }

        /* ========== 下载引导 ========== */
        .download-section {
            background: #FAF7F2;
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }

        .download-grid {
            display: grid;
            grid-template-columns: 40% 1fr;
            gap: 48px;
            align-items: center;
        }

        .download-left .small-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-accent-hover);
            text-transform: uppercase;
            letter-spacing: 0.04em;
            margin-bottom: 8px;
        }

        .download-left h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--color-text);
        }

        .download-left p {
            color: var(--color-muted);
            font-size: 15px;
            line-height: 1.7;
            margin-bottom: 24px;
        }

        .download-btns {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 12px;
        }

        .store-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            height: 48px;
            padding: 0 20px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
            box-shadow: var(--shadow-weak);
        }

        .store-btn:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-mid);
        }

        .version-tip {
            font-size: 13px;
            color: var(--color-muted);
        }

        .download-right {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 16px;
        }

        .qr-code {
            width: 160px;
            height: 160px;
            border-radius: 12px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-weak);
            position: relative;
        }

        .qr-code::before {
            content: "";
            position: absolute;
            inset: 12px;
            border-radius: 6px;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Crect width='100' height='100' fill='%23f7f5f1'/%3E%3Crect x='8' y='8' width='36' height='36' fill='%231B4A3C'/%3E%3Crect x='56' y='8' width='36' height='36' fill='%231B4A3C'/%3E%3Crect x='8' y='56' width='36' height='36' fill='%231B4A3C'/%3E%3Crect x='32' y='32' width='12' height='12' fill='%23E8932A'/%3E%3Crect x='56' y='56' width='12' height='12' fill='%23E8932A'/%3E%3Crect x='72' y='56' width='20' height='12' fill='%231B4A3C'/%3E%3Crect x='56' y='72' width='12' height='20' fill='%231B4A3C'/%3E%3Crect x='72' y='72' width='20' height='20' fill='%231B4A3C'/%3E%3C/svg%3E");
            background-size: cover;
        }

        .qr-caption {
            font-size: 13px;
            color: var(--color-muted);
        }

        /* ========== 收藏 / 分享 CTA ========== */
        .save-cta {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            padding: 32px 24px;
            flex-wrap: wrap;
            text-align: center;
        }

        .save-cta-text {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-text);
        }

        .save-btn,
        .share-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 42px;
            padding: 0 22px;
            border-radius: 999px;
            background: rgba(27, 74, 60, 0.08);
            color: var(--color-primary);
            font-size: 14px;
            font-weight: 600;
            border: 1px solid transparent;
        }

        .save-btn:hover,
        .share-btn:hover {
            background: rgba(27, 74, 60, 0.14);
            transform: translateY(-2px);
        }

        /* ========== 资讯列表 ========== */
        .news-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
            flex-wrap: wrap;
            gap: 12px;
        }

        .view-all {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .view-all:hover {
            color: var(--color-accent-hover);
        }

        .news-list-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 20px 8px;
            border-bottom: 1px solid var(--color-border);
            transition: background .2s var(--ease);
        }

        .news-list-item:first-child {
            border-top: 1px solid var(--color-border);
        }

        .news-list-item:hover {
            background: rgba(27, 74, 60, 0.02);
        }

        .news-date {
            flex-shrink: 0;
            width: 64px;
            text-align: center;
            border-right: 1px solid var(--color-border);
            margin-right: 4px;
            padding-right: 16px;
        }

        .news-date-day {
            font-size: 26px;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.2;
            font-family: Georgia, serif;
        }

        .news-date-month {
            font-size: 13px;
            color: var(--color-muted);
        }

        .news-main {
            flex: 1;
            min-width: 0;
        }

        .news-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .news-title a {
            color: inherit;
        }

        .news-title a:hover {
            color: var(--color-primary);
        }

        .news-summary {
            font-size: 14px;
            color: var(--color-muted);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .news-category {
            flex-shrink: 0;
            background: rgba(27, 74, 60, 0.08);
            color: var(--color-primary);
            font-size: 13px;
            font-weight: 500;
            border-radius: 999px;
            padding: 4px 14px;
        }

        .news-arrow {
            flex-shrink: 0;
            color: var(--color-muted);
            font-size: 20px;
            font-weight: 300;
            transition: transform .24s var(--ease), color .24s var(--ease);
        }

        .news-list-item:hover .news-arrow {
            color: var(--color-primary);
            transform: translateX(4px);
        }

        .news-empty {
            text-align: center;
            padding: 48px 20px;
            color: var(--color-muted);
            font-size: 15px;
            border: 1px dashed var(--color-border);
            border-radius: var(--radius-card);
            background: var(--color-surface);
        }

        .news-empty svg {
            width: 48px;
            height: 48px;
            color: var(--color-border);
            margin: 0 auto 12px;
            display: block;
        }

        /* ========== 相关推荐 ========== */
        .recommend-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .recommend-card {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-left: 4px solid var(--color-primary);
            border-radius: 8px 12px 12px 8px;
            padding: 18px 20px;
            min-height: 72px;
            transition: box-shadow .24s var(--ease), transform .24s var(--ease), background .24s var(--ease);
        }

        .recommend-card:hover {
            box-shadow: var(--shadow-mid);
            transform: translateY(-2px);
            background: rgba(255, 255, 255, 0.8);
        }

        .recommend-text {
            min-width: 0;
        }

        .recommend-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .recommend-desc {
            font-size: 13px;
            color: var(--color-muted);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            margin-top: 2px;
        }

        .recommend-arrow {
            flex-shrink: 0;
            color: var(--color-primary);
            font-size: 20px;
        }

        /* ========== FAQ ========== */
        .faq-wrap {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 16px;
            overflow: hidden;
        }

        .faq-item {
            border-bottom: 1px solid var(--color-border);
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            width: 100%;
            min-height: 48px;
            padding: 12px 20px;
            font-size: 15px;
            font-weight: 500;
            color: var(--color-text);
            text-align: left;
            background: transparent;
            line-height: 1.5;
        }

        .faq-question:hover {
            background: rgba(27, 74, 60, 0.03);
        }

        .faq-arrow {
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: transform .3s var(--ease);
            color: var(--color-muted);
        }

        .faq-item.open .faq-arrow {
            transform: rotate(180deg);
            color: var(--color-primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s var(--ease);
        }

        .faq-answer-inner {
            padding: 0 20px 16px;
            font-size: 15px;
            color: var(--color-muted);
            line-height: 1.75;
        }

        .faq-item.open .faq-answer {
            max-height: 500px;
        }

        /* ========== CTA 横幅 ========== */
        .cta-banner {
            background: linear-gradient(120deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            border-radius: 16px;
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
            position: relative;
            overflow: hidden;
        }

        .cta-banner::before {
            content: "";
            position: absolute;
            right: -60px;
            top: -60px;
            width: 200px;
            height: 200px;
            background: rgba(232, 147, 42, 0.1);
            border-radius: 50%;
        }

        .cta-banner h2 {
            font-size: clamp(1.4rem, 2.5vw, 1.9rem);
            font-weight: 700;
            color: var(--color-on-dark);
            margin-bottom: 6px;
        }

        .cta-banner p {
            color: rgba(250, 246, 239, 0.75);
            font-size: 15px;
        }

        .cta-banner .btn-primary {
            position: relative;
            z-index: 2;
            flex-shrink: 0;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--color-primary-deeper);
            color: rgba(250, 246, 239, 0.8);
            margin-top: 0;
            padding-top: 64px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
        }

        .footer-brand .brand-name {
            color: var(--color-on-dark);
            font-size: 20px;
            margin-bottom: 10px;
        }

        .footer-brand .brand-logo {
            width: 36px;
            height: 36px;
            font-size: 18px;
        }

        .footer-brand-desc {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(250, 246, 239, 0.6);
            margin-top: 16px;
            max-width: 260px;
        }

        .footer-col-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--color-on-dark);
            margin-bottom: 16px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(250, 246, 239, 0.7);
            font-size: 14px;
            line-height: 1.6;
        }

        .footer-links a:hover {
            color: var(--color-accent);
        }

        .footer-contact p {
            font-size: 14px;
            margin-bottom: 8px;
            color: rgba(250, 246, 239, 0.7);
        }

        .footer-qr {
            margin-top: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .footer-qr-box {
            width: 64px;
            height: 64px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 11px;
            color: rgba(250, 246, 239, 0.5);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 24px 0 32px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(250, 246, 239, 0.5);
        }

        .footer-bottom a {
            color: rgba(250, 246, 239, 0.5);
        }

        .footer-bottom a:hover {
            color: var(--color-accent);
        }

        .footer-status {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: rgba(250, 246, 239, 0.7);
            font-size: 13px;
        }

        .footer-status .dot {
            width: 6px;
            height: 6px;
            background: var(--color-success);
            border-radius: 50%;
            display: inline-block;
        }

        /* ========== 滚动动画 ========== */
        .fade-up {
            opacity: 0;
            transform: translateY(16px);
            transition: opacity .6s var(--ease), transform .6s var(--ease);
        }

        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1023px) {
            .catalog-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .hero-inner {
                gap: 24px;
            }

            .hero-right {
                display: none;
            }

            .hero {
                min-height: 480px;
            }

            .download-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .download-right {
                order: -1;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .header-hotwords {
                display: none;
            }

            .recommend-list {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 767px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .header-nav {
                display: none;
            }

            .header-menu-btn {
                display: flex;
            }

            .header-download-btn {
                display: none;
            }

            .brand-name {
                font-size: 16px;
            }

            .brand-sub {
                font-size: 11px;
            }

            .hero h1 {
                font-size: clamp(1.9rem, 7vw, 2.4rem);
            }

            .hero-btns .btn-primary,
            .hero-btns .btn-ghost-light {
                width: 100%;
            }

            .hero-trust {
                gap: 12px;
            }

            .hero {
                min-height: 440px;
            }

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

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

            .news-list-item {
                flex-wrap: wrap;
                gap: 10px;
            }

            .news-date {
                width: auto;
                border-right: none;
                padding-right: 0;
                display: flex;
                align-items: baseline;
                gap: 6px;
            }

            .news-date-day {
                font-size: 20px;
            }

            .news-summary {
                display: none;
            }

            .news-category {
                font-size: 12px;
                padding: 2px 10px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .site-footer {
                padding-top: 48px;
            }

            .cta-banner {
                padding: 32px 24px;
                flex-direction: column;
                text-align: center;
            }

            .cta-banner .btn-primary {
                width: 100%;
            }

            .save-cta {
                flex-direction: column;
                gap: 12px;
            }

            .search-form {
                flex-direction: column;
            }

            .search-submit {
                width: 100%;
            }
        }

        @media (max-width: 520px) {
            .brand-sub {
                display: none;
            }

            .catalog-card {
                min-height: 140px;
            }

            .download-btns {
                flex-direction: column;
            }

            .store-btn {
                width: 100%;
                justify-content: center;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #1B4A3C;
            --color-primary-dark: #12392E;
            --color-primary-deeper: #0E241C;
            --color-accent: #E8932A;
            --color-accent-hover: #D97A1A;
            --color-bg: #F7F5F1;
            --color-surface: #FFFFFF;
            --color-text: #1D2B25;
            --color-muted: #54665E;
            --color-border: #E3DFD7;
            --color-success: #2E7D5B;
            --color-warning: #D97706;
            --color-on-dark: #FAF6EF;
            --shadow-weak: 0 1px 4px rgba(14, 36, 28, 0.05);
            --shadow-mid: 0 8px 24px rgba(14, 36, 28, 0.08);
            --shadow-cta: 0 6px 16px rgba(232, 147, 42, 0.28);
            --shadow-header: 0 2px 12px rgba(14, 36, 28, 0.08);
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-input: 10px;
            --radius-badge: 999px;
            --radius-hero: 16px;
            --ease: cubic-bezier(.4, 0, .2, 1);
            --duration: 240ms;
            --section-gap: clamp(56px, 7vw, 96px);
            --container-max: 1200px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            background: var(--color-bg);
            color: var(--color-text);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--duration) var(--ease);
        }
        a:hover {
            color: var(--color-primary-dark);
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        input {
            font-family: inherit;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section {
            padding: var(--section-gap) 0;
        }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 48px;
        }
        .section-header h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-text);
            position: relative;
            display: inline-block;
        }
        .section-header h2::after {
            content: "";
            display: block;
            width: 40px;
            height: 4px;
            border-radius: 4px;
            background: var(--color-accent);
            margin: 12px auto 0;
        }
        .section-header p {
            margin-top: 16px;
            color: var(--color-muted);
            font-size: 0.9375rem;
            line-height: 1.75;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 48px;
            padding: 0 32px;
            border-radius: var(--radius-btn);
            font-size: 0.9375rem;
            font-weight: 600;
            transition: all var(--duration) var(--ease);
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--color-accent);
            color: var(--color-primary-deeper);
            box-shadow: var(--shadow-cta);
        }
        .btn-primary:hover {
            background: var(--color-accent-hover);
            color: var(--color-primary-deeper);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-on-dark);
            border: 1px solid rgba(255, 255, 255, 0.5);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.75);
            color: #fff;
        }
        .btn-outline:active {
            transform: scale(0.98);
        }
        .btn-dark {
            background: var(--color-primary);
            color: #fff;
            box-shadow: var(--shadow-weak);
        }
        .btn-dark:hover {
            background: var(--color-primary-dark);
            color: #fff;
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(247, 245, 241, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--color-border);
            transition: box-shadow var(--duration) var(--ease);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-header);
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 52px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        .brand-logo {
            width: 34px;
            height: 34px;
            border-radius: 10px;
            background: var(--color-primary);
            color: var(--color-accent);
            font-size: 18px;
            font-weight: 800;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .brand-name {
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--color-text);
            letter-spacing: 0.01em;
        }
        .brand-sub {
            font-size: 0.8125rem;
            color: var(--color-muted);
            border-left: 1px solid var(--color-border);
            padding-left: 10px;
            line-height: 1.2;
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-search-btn,
        .header-menu-btn {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--color-text);
            transition: background var(--duration) var(--ease);
        }
        .header-search-btn:hover,
        .header-menu-btn:hover {
            background: rgba(27, 74, 60, 0.08);
        }
        .header-download-btn {
            height: 36px;
            padding: 0 10px;
            border-radius: 6px;
            background: var(--color-accent);
            color: var(--color-primary-deeper);
            font-size: 0.8125rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            transition: all var(--duration) var(--ease);
        }
        .header-download-btn:hover {
            background: var(--color-accent-hover);
            color: var(--color-primary-deeper);
        }
        .header-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-top: 1px solid rgba(227, 223, 215, 0.6);
            height: 44px;
        }
        .nav-links {
            display: flex;
            height: 100%;
            gap: 4px;
        }
        .nav-links li {
            height: 100%;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            height: 100%;
            padding: 0 18px;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--color-muted);
            position: relative;
            transition: color var(--duration) var(--ease);
        }
        .nav-links a:hover {
            color: var(--color-primary);
        }
        .nav-links a.active {
            color: var(--color-primary);
            font-weight: 600;
        }
        .nav-links a.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 18px;
            right: 18px;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px 2px 0 0;
        }
        .header-hotwords {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .hotword-link {
            height: 26px;
            padding: 0 14px;
            border-radius: var(--radius-badge);
            background: rgba(27, 74, 60, 0.06);
            font-size: 0.8125rem;
            color: var(--color-muted);
            display: inline-flex;
            align-items: center;
            transition: all var(--duration) var(--ease);
        }
        .hotword-link:hover {
            background: rgba(27, 74, 60, 0.12);
            color: var(--color-primary);
        }

        /* Search Panel */
        .search-panel {
            display: none;
            background: rgba(247, 245, 241, 0.98);
            border-bottom: 1px solid var(--color-border);
            padding: 20px 0;
            animation: fadeIn 0.2s ease;
        }
        .search-panel.open {
            display: block;
        }
        .search-form {
            display: flex;
            gap: 12px;
        }
        .search-form input {
            flex: 1;
            height: 44px;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-input);
            padding: 0 16px;
            font-size: 0.9375rem;
            outline: none;
            transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
            background: #fff;
        }
        .search-form input:focus {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 3px rgba(27, 74, 60, 0.12);
        }
        .search-submit {
            height: 44px;
            padding: 0 28px;
            border-radius: var(--radius-btn);
            background: var(--color-primary);
            color: #fff;
            font-size: 0.875rem;
            font-weight: 600;
            transition: background var(--duration) var(--ease);
        }
        .search-submit:hover {
            background: var(--color-primary-dark);
        }
        .search-hot {
            display: flex;
            gap: 8px;
            align-items: center;
            margin-top: 14px;
            font-size: 0.8125rem;
            color: var(--color-muted);
        }
        .search-hot a {
            color: var(--color-muted);
        }
        .search-hot a:hover {
            color: var(--color-primary);
        }

        /* Mobile Menu */
        .mobile-menu {
            display: none;
            background: rgba(247, 245, 241, 0.98);
            border-bottom: 1px solid var(--color-border);
            padding: 16px 24px 20px;
            animation: fadeIn 0.2s ease;
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu .mobile-nav-links {
            display: flex;
            flex-direction: column;
        }
        .mobile-menu .mobile-nav-links a {
            padding: 14px 0;
            font-size: 1rem;
            font-weight: 500;
            color: var(--color-text);
            border-bottom: 1px solid rgba(227, 223, 215, 0.6);
        }
        .mobile-menu .mobile-nav-links a:hover {
            color: var(--color-primary);
        }
        .mobile-menu .mobile-nav-links a.active {
            color: var(--color-primary);
            font-weight: 700;
        }
        .mobile-hotwords {
            display: flex;
            gap: 10px;
            margin-top: 16px;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(-6px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* Page Hero */
        .page-hero {
            position: relative;
            padding: clamp(64px, 8vw, 110px) 0 clamp(48px, 6vw, 72px);
            background: linear-gradient(100deg, rgba(14, 36, 28, 0.92) 20%, rgba(27, 74, 60, 0.82) 60%, rgba(18, 57, 46, 0.6) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            color: var(--color-on-dark);
        }
        .page-hero .breadcrumbs {
            font-size: 0.8125rem;
            margin-bottom: 28px;
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .page-hero .breadcrumbs a {
            color: rgba(250, 246, 239, 0.65);
            transition: color var(--duration) var(--ease);
        }
        .page-hero .breadcrumbs a:hover {
            color: var(--color-accent);
        }
        .page-hero .breadcrumbs span {
            color: rgba(250, 246, 239, 0.4);
        }
        .page-hero .breadcrumbs .current {
            color: rgba(250, 246, 239, 0.85);
        }
        .page-hero h1 {
            font-size: clamp(2rem, 4.5vw, 3rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.02em;
            max-width: 760px;
            margin-bottom: 20px;
        }
        .page-hero h1 .accent {
            color: var(--color-accent);
            position: relative;
        }
        .page-hero .hero-desc {
            max-width: 680px;
            font-size: 1rem;
            line-height: 1.8;
            color: rgba(250, 246, 239, 0.85);
            margin-bottom: 32px;
        }
        .page-hero .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* Download Channels */
        .download-channels {
            padding-top: clamp(48px, 6vw, 80px);
            background: var(--color-bg);
        }
        .channels-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .channel-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease), border-color var(--duration) var(--ease);
            position: relative;
            overflow: hidden;
        }
        .channel-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-mid);
            border-color: rgba(27, 74, 60, 0.3);
        }
        .channel-card .channel-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: rgba(27, 74, 60, 0.08);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 24px;
        }
        .channel-card h3 {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--color-text);
        }
        .channel-card p {
            font-size: 0.875rem;
            color: var(--color-muted);
            line-height: 1.7;
            min-height: 60px;
        }
        .channel-card .channel-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.875rem;
            font-weight: 500;
            margin-top: 16px;
            color: var(--color-primary);
        }
        .channel-card .channel-link svg {
            transition: transform var(--duration) var(--ease);
        }
        .channel-card .channel-link:hover svg {
            transform: translateX(4px);
        }

        /* System Requirements */
        .system-requirements {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .requirements-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .requirement-card {
            padding: 40px 36px;
            border-radius: var(--radius-card);
            background: linear-gradient(135deg, rgba(27, 74, 60, 0.04), rgba(27, 74, 60, 0.01));
            border: 1px solid var(--color-border);
        }
        .requirement-card .req-header {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 24px;
        }
        .requirement-card .req-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--color-primary);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
        }
        .requirement-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text);
        }
        .requirement-card .req-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px 24px;
        }
        .req-item {
            padding: 14px 16px;
            background: #fff;
            border-radius: 8px;
            border: 1px solid var(--color-border);
        }
        .req-item .label {
            font-size: 0.8125rem;
            color: var(--color-muted);
            margin-bottom: 4px;
        }
        .req-item .value {
            font-size: 0.9375rem;
            font-weight: 600;
            color: var(--color-text);
        }

        /* Install Steps */
        .install-steps {
            background: var(--color-bg);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            position: relative;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-mid);
        }
        .step-item .step-number {
            font-family: Georgia, serif;
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--color-primary);
            opacity: 0.25;
            line-height: 1;
            margin-bottom: 18px;
        }
        .step-item h3 {
            font-size: 1.0625rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--color-text);
        }
        .step-item p {
            font-size: 0.875rem;
            color: var(--color-muted);
            line-height: 1.65;
        }
        .step-item::before {
            content: "";
            position: absolute;
            top: 28px;
            right: -12px;
            width: 24px;
            height: 24px;
            background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23E8932A' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h14m-6-6 6 6-6 6'/%3E%3C/svg%3E") center/contain no-repeat;
            display: none;
        }
        @media (min-width: 1024px) {
            .step-item:not(:last-child)::before {
                display: block;
            }
        }

        /* Security Tips */
        .security-tips {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
        }
        .security-wrap {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 48px;
            align-items: center;
        }
        .security-image {
            border-radius: var(--radius-hero);
            overflow: hidden;
            position: relative;
        }
        .security-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 280px;
        }
        .security-content h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            margin-bottom: 16px;
            line-height: 1.3;
            position: relative;
            padding-left: 18px;
        }
        .security-content h2::before {
            content: "";
            position: absolute;
            left: 0;
            top: 4px;
            bottom: 4px;
            width: 4px;
            border-radius: 4px;
            background: var(--color-primary);
        }
        .security-tips-list {
            margin-top: 24px;
        }
        .security-tips-list li {
            display: flex;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid var(--color-border);
            font-size: 0.9375rem;
            color: var(--color-text);
            align-items: flex-start;
        }
        .security-tips-list li:last-child {
            border-bottom: none;
        }
        .security-tips-list .tip-dot {
            flex-shrink: 0;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--color-success);
            margin-top: 10px;
        }

        /* Topic Links */
        .topic-links {
            background: var(--color-bg);
        }
        .topic-links-grid {
            display: flex;
            flex-direction: column;
            gap: 0;
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--color-border);
            background: var(--color-surface);
        }
        .topic-link-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 20px 28px;
            border-bottom: 1px solid var(--color-border);
            transition: background var(--duration) var(--ease);
        }
        .topic-link-item:last-child {
            border-bottom: none;
        }
        .topic-link-item:hover {
            background: rgba(27, 74, 60, 0.03);
        }
        .topic-link-item .topic-index {
            font-family: Georgia, serif;
            font-size: 1.5rem;
            font-weight: 700;
            color: rgba(27, 74, 60, 0.25);
            width: 48px;
            flex-shrink: 0;
        }
        .topic-link-item .topic-text {
            flex: 1;
        }
        .topic-link-item .topic-text h3 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 2px;
        }
        .topic-link-item .topic-text p {
            font-size: 0.875rem;
            color: var(--color-muted);
            line-height: 1.6;
        }
        .topic-link-item .topic-arrow {
            color: var(--color-primary);
            font-size: 1.25rem;
            opacity: 0.4;
            transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
        }
        .topic-link-item:hover .topic-arrow {
            transform: translateX(4px);
            opacity: 0.8;
        }

        /* FAQ */
        .faq-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            overflow: hidden;
        }
        .faq-item {
            border-bottom: 1px solid var(--color-border);
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 0 24px;
            height: 48px;
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--color-text);
            background: transparent;
            transition: background var(--duration) var(--ease);
            text-align: left;
        }
        .faq-question:hover {
            background: rgba(27, 74, 60, 0.04);
        }
        .faq-question .faq-arrow {
            flex-shrink: 0;
            transition: transform var(--duration) var(--ease);
            color: var(--color-muted);
        }
        .faq-item.open .faq-question .faq-arrow {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-answer {
            display: none;
            padding: 4px 24px 20px;
            font-size: 0.9375rem;
            color: var(--color-muted);
            line-height: 1.75;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* CTA Band */
        .cta-band {
            background: linear-gradient(120deg, var(--color-primary-deeper), var(--color-primary-dark));
            padding: clamp(48px, 6vw, 72px) 0;
            text-align: center;
            color: var(--color-on-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-band::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -10%;
            width: 380px;
            height: 380px;
            background: radial-gradient(circle, rgba(232, 147, 42, 0.18), transparent 70%);
            pointer-events: none;
        }
        .cta-band h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-band p {
            font-size: 0.9375rem;
            color: rgba(250, 246, 239, 0.7);
            margin-bottom: 28px;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: var(--color-primary-deeper);
            color: var(--color-on-dark);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.4fr;
            gap: 40px;
            padding-bottom: 48px;
        }
        .footer-brand .brand {
            margin-bottom: 16px;
        }
        .footer-brand .brand-name {
            color: var(--color-on-dark);
        }
        .footer-brand .brand-sub {
            color: rgba(250, 246, 239, 0.5);
            border-left-color: rgba(255, 255, 255, 0.15);
        }
        .footer-brand-desc {
            font-size: 0.875rem;
            color: rgba(250, 246, 239, 0.55);
            line-height: 1.7;
            max-width: 280px;
            margin-top: 12px;
        }
        .footer-col-title {
            font-size: 0.9375rem;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--color-on-dark);
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            font-size: 0.875rem;
            color: rgba(250, 246, 239, 0.55);
            transition: color var(--duration) var(--ease);
        }
        .footer-links a:hover {
            color: var(--color-accent);
        }
        .footer-grid p {
            font-size: 0.8125rem;
            color: rgba(250, 246, 239, 0.45);
            line-height: 1.6;
        }
        .footer-qr {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-top: 16px;
        }
        .footer-qr-box {
            width: 64px;
            height: 64px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            color: rgba(250, 246, 239, 0.5);
            background: rgba(255, 255, 255, 0.04);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            font-size: 0.8125rem;
            color: rgba(250, 246, 239, 0.45);
        }
        .footer-bottom a {
            color: rgba(250, 246, 239, 0.45);
        }
        .footer-bottom a:hover {
            color: var(--color-accent);
        }
        .footer-status {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8125rem;
            color: rgba(250, 246, 239, 0.6);
        }
        .footer-status .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-success);
            box-shadow: 0 0 0 3px rgba(46, 125, 91, 0.3);
        }

        /* Reveal animation */
        .reveal {
            opacity: 0;
            transform: translateY(16px);
            transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
        }
        .reveal.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* Responsive */
        @media (min-width: 1024px) {
            .header-menu-btn {
                display: none;
            }
        }
        @media (max-width: 1023px) and (min-width: 768px) {
            .header-nav {
                display: none;
            }
            .header-menu-btn {
                display: inline-flex;
            }
            .channels-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .requirements-grid {
                grid-template-columns: 1fr;
            }
            .security-wrap {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 767px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .header-top {
                height: 48px;
            }
            .header-nav {
                display: none;
            }
            .header-download-btn {
                font-size: 0.75rem;
                padding: 0 12px;
            }
            .brand-sub {
                display: none;
            }
            .page-hero {
                padding: 48px 0 56px;
            }
            .page-hero h1 {
                font-size: 1.75rem;
            }
            .hero-actions .btn {
                width: 100%;
                margin-bottom: 4px;
            }
            .channels-grid {
                grid-template-columns: 1fr;
            }
            .channel-card p {
                min-height: auto;
            }
            .requirements-grid {
                grid-template-columns: 1fr;
            }
            .requirement-card {
                padding: 28px 20px;
            }
            .req-list {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .step-item::before {
                display: none;
            }
            .security-wrap {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .topic-link-item {
                padding: 16px 18px;
                gap: 12px;
            }
            .topic-link-item .topic-index {
                font-size: 1.25rem;
                width: 36px;
            }
            .faq-question {
                padding: 0 16px;
                font-size: 0.875rem;
            }
            .faq-answer {
                padding: 0 16px 16px;
            }
            .cta-actions .btn {
                width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
            .search-form {
                flex-direction: column;
            }
            .search-submit {
                width: 100%;
            }
        }
        @media (max-width: 520px) {
            .requirements-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .channels-grid {
                grid-template-columns: 1fr;
            }
            .topic-links-grid {
                border-radius: 8px;
            }
            .faq-wrap {
                border-radius: 8px;
            }
        }

/* roulang page: article */
:root {
    --color-primary: #1B4A3C;
    --color-primary-dark: #12392E;
    --color-primary-deeper: #0E241C;
    --color-accent: #E8932A;
    --color-accent-hover: #D97A1A;
    --color-bg: #F7F5F1;
    --color-surface: #FFFFFF;
    --color-text: #1D2B25;
    --color-muted: #54665E;
    --color-border: #E3DFD7;
    --color-success: #2E7D5B;
    --color-on-dark: #FAF6EF;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-weak: 0 1px 4px rgba(14,36,28,0.05);
    --shadow-mid: 0 8px 24px rgba(14,36,28,0.08);
    --shadow-cta: 0 6px 16px rgba(232,147,42,0.28);
    --transition: 220ms cubic-bezier(.4, 0, .2, 1);
}
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}
img {
    max-width: 100%;
    display: block;
}
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover {
    color: var(--color-primary-dark);
}
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}
input {
    font-family: inherit;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(247,245,241,0.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition);
}
.site-header.scrolled {
    box-shadow: 0 2px 12px rgba(14,36,28,0.08);
}
.search-panel {
    display: none;
    padding: 16px 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}
.search-panel.open {
    display: block;
}
.search-form {
    display: flex;
    gap: 8px;
    max-width: 640px;
    margin: 0 auto;
}
.search-form input {
    flex: 1;
    height: 44px;
    padding: 0 16px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    font-size: 14px;
    background: var(--color-surface);
    color: var(--color-text);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.search-form input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(27,74,60,0.15);
}
.search-submit {
    height: 44px;
    padding: 0 24px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    transition: background var(--transition);
}
.search-submit:hover {
    background: var(--color-primary-dark);
}
.search-hot {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: center;
    margin-top: 12px;
    font-size: 13px;
    color: var(--color-muted);
}
.search-hot a {
    color: var(--color-muted);
    padding: 2px 12px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface);
    transition: all var(--transition);
}
.search-hot a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 8px;
}
.brand-logo {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    font-size: 17px;
    font-weight: 800;
    box-shadow: inset 0 0 0 2px rgba(232,147,42,0.45);
}
.brand-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.01em;
}
.brand-sub {
    font-size: 13px;
    color: var(--color-muted);
    background: rgba(232,147,42,0.12);
    padding: 2px 8px;
    border-radius: 999px;
    font-weight: 500;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}
.header-search-btn {
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    border-radius: 8px;
    transition: background var(--transition);
}
.header-search-btn:hover {
    background: rgba(27,74,60,0.06);
}
.header-download-btn {
    height: 36px;
    padding: 0 16px;
    display: inline-flex;
    align-items: center;
    background: var(--color-accent);
    color: var(--color-primary-deeper);
    font-size: 14px;
    font-weight: 700;
    border-radius: 8px;
    box-shadow: var(--shadow-cta);
    transition: background var(--transition), transform var(--transition);
}
.header-download-btn:hover {
    background: var(--color-accent-hover);
    color: var(--color-primary-deeper);
    transform: translateY(-1px);
}
.header-menu-btn {
    width: 38px;
    height: 38px;
    display: none;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    border-radius: 8px;
    transition: background var(--transition);
}
.header-menu-btn:hover {
    background: rgba(27,74,60,0.06);
}
.header-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 44px;
    gap: 20px;
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}
.nav-links a {
    display: inline-block;
    padding: 10px 2px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}
.nav-links a:hover {
    color: var(--color-primary);
}
.nav-links a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: 600;
}
.header-hotwords {
    display: flex;
    align-items: center;
    gap: 8px;
}
.hotword-link {
    font-size: 13px;
    color: var(--color-muted);
    padding: 3px 12px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface);
    transition: all var(--transition);
}
.hotword-link:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.article-hero {
    background: linear-gradient(180deg, rgba(27,74,60,0.90) 0%, rgba(14,36,28,0.96) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
    color: var(--color-on-dark);
    padding: 64px 0 72px;
    position: relative;
}
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 13px;
    color: rgba(250,246,239,0.65);
    margin-bottom: 20px;
}
.breadcrumb a {
    color: rgba(250,246,239,0.75);
    transition: color var(--transition);
}
.breadcrumb a:hover {
    color: var(--color-accent);
}
.breadcrumb-sep {
    opacity: 0.5;
}
.article-hero h1 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: #fff;
    max-width: 860px;
    margin-bottom: 16px;
}
.article-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 14px;
    color: rgba(250,246,239,0.7);
}
.article-meta .meta-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}
.article-meta .meta-dot {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: rgba(250,246,239,0.4);
}
.article-main {
    padding: 64px 0 72px;
}
.article-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
}
.article-body {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px 44px;
    box-shadow: var(--shadow-weak);
}
.article-body p {
    margin-bottom: 1.5em;
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
}
.article-body h2 {
    font-size: 22px;
    font-weight: 700;
    line-height: 1.4;
    margin: 2em 0 0.8em;
    padding-left: 14px;
    border-left: 4px solid var(--color-primary);
    color: var(--color-text);
}
.article-body h3 {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin: 1.8em 0 0.6em;
    color: var(--color-text);
}
.article-body img {
    border-radius: var(--radius);
    margin: 24px 0;
    box-shadow: var(--shadow-weak);
}
.article-body blockquote {
    border-left: 4px solid var(--color-accent);
    background: #FBF7EF;
    padding: 14px 20px;
    margin: 24px 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-muted);
    font-size: 15px;
    line-height: 1.75;
}
.article-body ul,
.article-body ol {
    margin: 1.2em 0 1.5em;
    padding-left: 24px;
    line-height: 1.8;
}
.article-body li {
    margin-bottom: 8px;
}
.article-body a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}
.article-body a:hover {
    color: var(--color-accent-hover);
}
.article-body figure {
    margin: 24px 0;
}
.article-body figcaption {
    font-size: 13px;
    color: var(--color-muted);
    text-align: center;
    margin-top: 8px;
}
.article-empty {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 80px 40px;
    text-align: center;
    color: var(--color-muted);
    font-size: 16px;
}
.article-empty a {
    display: inline-block;
    margin-top: 16px;
    padding: 10px 28px;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: background var(--transition);
}
.article-empty a:hover {
    background: var(--color-primary-dark);
    color: #fff;
}
.article-tags-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 28px;
    padding: 20px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}
.article-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 14px;
    background: rgba(27,74,60,0.08);
    color: var(--color-primary);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
}
.article-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}
.btn-fav,
.btn-share {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 36px;
    padding: 0 18px;
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition);
}
.btn-fav:hover,
.btn-share:hover {
    background: rgba(27,74,60,0.08);
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn-fav.active {
    background: rgba(232,147,42,0.14);
    color: var(--color-accent-hover);
    border-color: var(--color-accent);
}
.back-link {
    margin-top: 28px;
    text-align: center;
}
.back-link a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--color-muted);
    transition: color var(--transition);
}
.back-link a:hover {
    color: var(--color-primary);
}
.back-link a::before {
    content: "←";
    font-size: 16px;
}
.related-section {
    padding: 56px 0 80px;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}
.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 32px;
    letter-spacing: -0.01em;
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.related-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-weak);
    transition: transform var(--transition), box-shadow var(--transition);
}
.related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-mid);
}
.related-card-media {
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--color-primary);
}
.related-card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 260ms cubic-bezier(.4, 0, .2, 1);
}
.related-card:hover .related-card-media img {
    transform: scale(1.04);
}
.related-card-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
}
.related-badge {
    display: inline-block;
    align-self: flex-start;
    padding: 3px 10px;
    background: rgba(232,147,42,0.14);
    color: var(--color-accent-hover);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}
.related-card h3 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.45;
    color: var(--color-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 46px;
}
.related-card p {
    font-size: 14px;
    color: var(--color-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.site-footer {
    background: var(--color-primary-deeper);
    color: var(--color-on-dark);
    padding: 64px 0 24px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 48px;
    margin-bottom: 40px;
}
.footer-brand .brand {
    margin-bottom: 14px;
}
.footer-brand .brand-logo {
    background: var(--color-primary);
    color: var(--color-on-dark);
    box-shadow: inset 0 0 0 2px rgba(232,147,42,0.45);
}
.footer-brand .brand-name {
    color: var(--color-on-dark);
}
.footer-brand .brand-sub {
    color: rgba(250,246,239,0.6);
    background: rgba(232,147,42,0.14);
}
.footer-brand-desc {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(250,246,239,0.6);
    max-width: 260px;
}
.footer-col-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-on-dark);
    margin-bottom: 16px;
}
.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-links a {
    font-size: 14px;
    color: rgba(250,246,239,0.6);
    transition: color var(--transition);
}
.footer-links a:hover {
    color: var(--color-accent);
}
.footer-grid p {
    font-size: 14px;
    color: rgba(250,246,239,0.6);
    margin-bottom: 8px;
    line-height: 1.7;
}
.footer-qr {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 14px;
}
.footer-qr-box {
    width: 88px;
    height: 88px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    color: var(--color-primary);
    font-size: 13px;
    border-radius: var(--radius-sm);
}
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 13px;
    color: rgba(250,246,239,0.5);
}
.footer-bottom a {
    color: rgba(250,246,239,0.5);
}
.footer-bottom a:hover {
    color: var(--color-accent);
}
.footer-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: rgba(250,246,239,0.6);
}
.footer-status .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-success);
    box-shadow: 0 0 0 3px rgba(46,125,91,0.3);
}
@media (max-width: 1023px) {
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}
@media (max-width: 767px) {
    .container {
        padding: 0 16px;
    }
    .header-menu-btn {
        display: flex;
    }
    .header-download-btn {
        display: none;
    }
    .header-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 16px;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        box-shadow: var(--shadow-mid);
    }
    .header-nav.open {
        display: flex;
    }
    .nav-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
        width: 100%;
        border-bottom: 1px solid var(--color-border);
        padding-bottom: 12px;
    }
    .nav-links a {
        display: block;
        padding: 8px 0;
        width: 100%;
        border-bottom: none;
    }
    .nav-links a.active {
        border-bottom: none;
    }
    .header-hotwords {
        flex-wrap: wrap;
        gap: 6px;
    }
    .article-hero {
        padding: 44px 0 52px;
    }
    .article-hero h1 {
        font-size: 1.6rem;
    }
    .article-meta {
        gap: 10px;
        font-size: 13px;
    }
    .article-main {
        padding: 40px 0 56px;
    }
    .article-body {
        padding: 24px 20px;
    }
    .article-body p {
        font-size: 15px;
    }
    .article-tags-actions {
        flex-direction: column;
        align-items: flex-start;
        padding: 16px;
    }
    .related-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}
@media (max-width: 520px) {
    .brand-name {
        font-size: 18px;
    }
    .brand-sub {
        font-size: 12px;
        padding: 1px 6px;
    }
    .search-form {
        flex-direction: column;
    }
    .search-submit {
        width: 100%;
    }
    .article-hero h1 {
        font-size: 1.4rem;
    }
}

/* roulang page: category2 */
:root{
  --color-primary:#1B4A3C;
  --color-primary-dark:#12392E;
  --color-primary-deeper:#0E241C;
  --color-accent:#E8932A;
  --color-accent-hover:#D97A1A;
  --color-bg:#F7F5F1;
  --color-surface:#FFFFFF;
  --color-text:#1D2B25;
  --color-muted:#54665E;
  --color-border:#E3DFD7;
  --color-success:#2E7D5B;
  --color-warning:#D97706;
  --color-on-dark:#FAF6EF;
  --radius-card:12px;
  --radius-btn:8px;
  --radius-input:10px;
  --radius-badge:999px;
  --radius-hero:16px;
  --shadow-weak:0 1px 4px rgba(14,36,28,0.05);
  --shadow-mid:0 8px 24px rgba(14,36,28,0.08);
  --shadow-cta:0 6px 16px rgba(232,147,42,0.28);
  --ease:cubic-bezier(.4,0,.2,1);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --sec-gap:clamp(56px,7vw,96px);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--color-bg);
  color:var(--color-text);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--color-primary);text-decoration:none;transition:color .24s var(--ease)}
a:hover{color:var(--color-primary-dark)}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding-left:24px;padding-right:24px}
@media(max-width:767px){.container{padding-left:16px;padding-right:16px}}
section{scroll-margin-top:130px}
.section-head{margin-bottom:40px}
.section-title{
  font-size:clamp(1.5rem,3vw,2rem);
  font-weight:700;
  line-height:1.3;
  position:relative;
  padding-left:16px;
  margin-bottom:10px;
}
.section-title::before{
  content:"";
  position:absolute;
  left:0;top:4px;bottom:4px;
  width:4px;border-radius:2px;
  background:var(--color-primary);
}
.section-desc{color:var(--color-muted);font-size:.95rem;max-width:680px}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(247,245,241,0.92);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--color-border);
  box-shadow:0 2px 12px rgba(14,36,28,0.08);
  transition:box-shadow .3s var(--ease);
}
.header-top{
  height:52px;
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;
}
.brand{display:flex;align-items:baseline;gap:6px;color:var(--color-text)}
.brand-logo{
  width:32px;height:32px;border-radius:9px;
  background:var(--color-primary);
  color:var(--color-on-dark);
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:16px;
  align-self:center;
}
.brand-name{font-size:18px;font-weight:800;letter-spacing:.5px;color:var(--color-text)}
.brand-sub{font-size:12px;color:var(--color-accent);font-weight:600;letter-spacing:1px}
.header-actions{display:flex;align-items:center;gap:12px}
.header-search-btn,.header-menu-btn{
  width:38px;height:38px;border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  color:var(--color-primary);
  transition:background .24s var(--ease),color .24s var(--ease);
}
.header-search-btn:hover,.header-menu-btn:hover{background:rgba(27,74,60,0.08);color:var(--color-primary-dark)}
.header-download-btn{
  background:var(--color-accent);
  color:var(--color-primary-deeper);
  font-size:14px;font-weight:700;
  padding:8px 20px;
  border-radius:var(--radius-btn);
  box-shadow:var(--shadow-cta);
  transition:background .24s var(--ease),transform .2s var(--ease);
}
.header-download-btn:hover{background:var(--color-accent-hover);color:var(--color-primary-deeper);transform:translateY(-1px)}
.header-download-btn:active{transform:scale(.97)}
.header-nav{
  height:44px;
  display:flex;align-items:center;justify-content:space-between;
  gap:20px;
}
.nav-links{display:flex;list-style:none;gap:6px;align-items:center;height:100%}
.nav-links li{height:100%}
.nav-links a{
  display:flex;align-items:center;height:100%;
  padding:0 14px;
  font-size:15px;font-weight:500;
  color:var(--color-text);
  position:relative;
  transition:color .24s var(--ease);
}
.nav-links a:hover{color:var(--color-primary)}
.nav-links a.active{color:var(--color-primary);font-weight:600}
.nav-links a.active::after{
  content:"";position:absolute;bottom:0;left:14px;right:14px;height:2px;
  background:var(--color-primary);border-radius:2px;
}
.header-hotwords{display:flex;gap:8px;align-items:center}
.hotword-link{
  font-size:13px;color:var(--color-muted);
  border:1px solid var(--color-border);
  border-radius:999px;
  padding:3px 14px;
  transition:all .24s var(--ease);
}
.hotword-link:hover{color:var(--color-primary);border-color:var(--color-primary);background:rgba(27,74,60,0.04)}
.search-panel{
  display:none;
  background:var(--color-surface);
  border-bottom:1px solid var(--color-border);
  padding:18px 0;
}
.search-panel.open{display:block}
.search-form{display:flex;gap:10px}
.search-form input{
  flex:1;height:44px;border:1px solid var(--color-border);
  border-radius:var(--radius-input);padding:0 16px;
  font-size:15px;background:var(--color-bg);
  outline:none;transition:border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.search-form input:focus{border-color:var(--color-primary);box-shadow:0 0 0 2px rgba(27,74,60,.12)}
.search-submit{
  background:var(--color-primary);color:var(--color-on-dark);
  border-radius:var(--radius-btn);padding:0 24px;
  font-size:14px;font-weight:600;
  transition:background .24s var(--ease);
}
.search-submit:hover{background:var(--color-primary-dark)}
.search-hot{margin-top:12px;display:flex;gap:8px;align-items:center;font-size:13px;color:var(--color-muted)}
.search-hot a{font-size:13px;color:var(--color-primary);border-bottom:1px solid transparent;transition:border-color .2s}
.search-hot a:hover{border-color:var(--color-primary)}
.header-menu-btn{display:none}

/* ===== category hero ===== */
.category-hero{
  position:relative;
  background:linear-gradient(135deg,var(--color-primary-deeper) 0%,var(--color-primary) 55%,#1d5b49 100%);
  color:var(--color-on-dark);
  overflow:hidden;
  padding:70px 0 80px;
}
.category-hero::before{
  content:"";
  position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-1.png');
  background-size:cover;background-position:center;
  opacity:.28;
}
.category-hero::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(to top,rgba(14,36,28,.9) 0%,rgba(18,57,46,.75) 60%,rgba(18,57,46,.35) 100%);
}
.category-hero .container{position:relative;z-index:2;display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(232,147,42,.15);
  border:1px solid rgba(232,147,42,.4);
  color:var(--color-accent);
  font-size:13px;font-weight:600;
  padding:4px 16px;border-radius:999px;
  margin-bottom:20px;
}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--color-accent);display:inline-block}
.category-hero h1{
  font-size:clamp(2rem,4vw,2.8rem);
  font-weight:800;line-height:1.2;
  letter-spacing:-0.02em;
  margin-bottom:18px;
}
.category-hero h1 em{font-style:normal;color:var(--color-accent);position:relative;white-space:nowrap}
.category-hero h1 em::after{
  content:"";position:absolute;left:0;right:0;bottom:4px;height:4px;
  background:var(--color-accent);border-radius:2px;opacity:.35;
}
.category-hero-desc{
  font-size:1.05rem;line-height:1.9;
  color:rgba(250,246,239,0.92);
  max-width:560px;
  margin-bottom:12px;
}
.hero-trust{
  display:flex;gap:24px;margin-top:28px;flex-wrap:wrap;
}
.hero-trust-item{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:500;color:rgba(250,246,239,.9)}
.hero-trust-item svg{width:18px;height:18px;color:var(--color-accent)}
.hero-cta-group{display:flex;gap:16px;margin-top:30px;flex-wrap:wrap}
.btn-primary{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--color-accent);color:var(--color-primary-deeper);
  height:48px;padding:0 30px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:700;
  box-shadow:var(--shadow-cta);
  transition:all .24s var(--ease);
  gap:8px;
}
.btn-primary:hover{background:var(--color-accent-hover);color:var(--color-primary-deeper);transform:translateY(-2px)}
.btn-primary:active{transform:scale(.98)}
.btn-secondary{
  display:inline-flex;align-items:center;justify-content:center;
  background:transparent;color:var(--color-on-dark);
  height:48px;padding:0 30px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:500;
  border:1px solid rgba(255,255,255,.45);
  transition:all .24s var(--ease);
  gap:8px;
}
.btn-secondary:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.8)}
.btn-secondary:active{transform:scale(.98)}
.hero-visual{
  border-radius:var(--radius-hero);
  overflow:hidden;
  border:1px solid rgba(232,147,42,.3);
  box-shadow:0 24px 48px rgba(0,0,0,.3);
  background:rgba(255,255,255,.06);
}
.hero-visual img{width:100%;height:100%;object-fit:cover;min-height:300px;max-height:420px}
.hero-visual-cap{
  padding:14px 20px;font-size:13px;color:rgba(250,246,239,.65);
  background:rgba(16,38,30,.7);
  letter-spacing:.5px;
}

/* ===== download methods ===== */
.download-methods{padding:var(--sec-gap) 0}
.methods-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:24px;
}
.method-card{
  background:var(--color-surface);
  border:1px solid var(--color-border);
  border-radius:var(--radius-card);
  overflow:hidden;
  display:flex;
  flex-direction:column;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease);
}
.method-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-mid);
  border-color:rgba(27,74,60,.25);
}
.method-card-img{position:relative;height:200px;overflow:hidden;background:var(--color-primary)}
.method-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.method-card:hover .method-card-img img{transform:scale(1.04)}
.method-badge{
  position:absolute;top:14px;left:14px;
  background:rgba(232,147,42,.95);color:var(--color-primary-deeper);
  font-size:12px;font-weight:700;
  padding:4px 12px;border-radius:999px;
  letter-spacing:.5px;
  box-shadow:0 2px 8px rgba(0,0,0,.18);
}
.method-card-body{padding:20px 24px 24px;display:flex;flex-direction:column;flex:1}
.method-card-body h3{font-size:1.15rem;font-weight:700;margin-bottom:8px;color:var(--color-text)}
.method-card-body p{font-size:.92rem;color:var(--color-muted);line-height:1.7;flex:1}
.method-link{
  display:inline-flex;align-items:center;gap:5px;
  margin-top:14px;font-size:14px;font-weight:600;
  color:var(--color-primary);
  transition:gap .24s var(--ease);
}
.method-link:hover{gap:9px;color:var(--color-primary-dark)}
.method-link svg{width:15px;height:15px}

/* ===== steps ===== */
.steps-section{
  padding:var(--sec-gap) 0;
  background:var(--color-primary-deeper);
  color:var(--color-on-dark);
  position:relative;
  overflow:hidden;
}
.steps-section::before{
  content:"";position:absolute;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;
  opacity:.12;inset:0;
}
.steps-section .container{position:relative;z-index:1}
.steps-section .section-title{color:var(--color-on-dark)}
.steps-section .section-title::before{background:var(--color-accent)}
.steps-section .section-desc{color:rgba(250,246,239,.65)}
.steps-grid{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:24px;margin-top:44px;
}
.step-item{
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.09);
  border-radius:var(--radius-card);
  padding:28px 24px;
  position:relative;
  transition:background .3s var(--ease),transform .3s var(--ease);
}
.step-item:hover{background:rgba(255,255,255,.09);transform:translateY(-3px)}
.step-num{
  font-family:Georgia,serif;
  font-size:40px;font-weight:700;
  color:var(--color-accent);
  display:block;line-height:1;
  margin-bottom:16px;
  opacity:.85;
}
.step-item h3{font-size:1rem;font-weight:600;margin-bottom:8px;color:var(--color-on-dark)}
.step-item p{font-size:.87rem;line-height:1.7;color:rgba(250,246,239,.6)}
.step-arrow{
  position:absolute;top:30px;right:16px;
  color:rgba(255,255,255,.2);width:20px;height:20px;
}
@media(max-width:1023px){
  .steps-grid{grid-template-columns:repeat(2,1fr)}
}

/* ===== requirements ===== */
.requirements-section{padding:var(--sec-gap) 0;background:var(--color-surface)}
.req-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px;
}
.req-card{
  background:var(--color-bg);
  border:1px solid var(--color-border);
  border-radius:var(--radius-card);
  padding:28px 24px;
  text-align:center;
  transition:box-shadow .3s var(--ease),transform .3s var(--ease);
}
.req-card:hover{
  box-shadow:var(--shadow-mid);
  transform:translateY(-3px);
}
.req-icon{
  width:52px;height:52px;margin:0 auto 16px;
  background:rgba(27,74,60,.09);
  border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  color:var(--color-primary);
}
.req-icon svg{width:26px;height:26px}
.req-value{font-size:1.2rem;font-weight:700;color:var(--color-text);margin-bottom:4px}
.req-label{font-size:.85rem;color:var(--color-muted)}

/* ===== subtopics ===== */
.subtopics-section{padding:var(--sec-gap) 0}
.subtopics-list{
  margin-top:36px;
  border:1px solid var(--color-border);
  border-radius:var(--radius-card);
  background:var(--color-surface);
  overflow:hidden;
}
.subtopic-item{
  display:flex;align-items:center;
  padding:0 28px;
  height:64px;
  border-bottom:1px solid var(--color-border);
  transition:background .24s var(--ease);
  gap:16px;
}
.subtopic-item:last-child{border-bottom:none}
.subtopic-item:hover{background:rgba(27,74,60,.03)}
.subtopic-num{
  font-family:Georgia,serif;
  font-size:18px;color:var(--color-accent);
  width:30px;text-align:center;
  font-weight:700;
}
.subtopic-info{flex:1;display:flex;align-items:center;justify-content:space-between;gap:16px}
.subtopic-info strong{font-size:15px;color:var(--color-text);font-weight:600}
.subtopic-info span{font-size:13px;color:var(--color-muted)}
.subtopic-arrow{color:var(--color-primary);opacity:.5;transition:opacity .24s var(--ease),transform .24s var(--ease)}
.subtopic-item:hover .subtopic-arrow{opacity:1;transform:translateX(4px)}

/* ===== faq ===== */
.faq-section{padding:var(--sec-gap) 0;background:var(--color-surface)}
.faq-container{
  margin-top:36px;
  border:1px solid var(--color-border);
  border-radius:16px;
  background:var(--color-surface);
  overflow:hidden;
}
.faq-item{border-bottom:1px solid var(--color-border)}
.faq-item:last-child{border-bottom:none}
.faq-question{
  display:flex;align-items:center;justify-content:space-between;
  height:48px;padding:0 24px;
  font-size:15px;font-weight:500;color:var(--color-text);
  cursor:pointer;user-select:none;
  transition:background .24s var(--ease);
  gap:16px;
}
.faq-question:hover{background:rgba(27,74,60,.03)}
.faq-question .arrow{
  width:18px;height:18px;flex-shrink:0;
  transition:transform .3s var(--ease);
  color:var(--color-primary);
}
.faq-item.open .faq-question .arrow{transform:rotate(180deg)}
.faq-answer{
  display:none;
  padding:0 24px 16px;
  font-size:15px;line-height:1.75;
  color:var(--color-muted);
}
.faq-item.open .faq-answer{display:block}

/* ===== cta ===== */
.cta-section{padding:var(--sec-gap) 0}
.cta-content{
  background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-deeper) 100%);
  border-radius:20px;
  padding:56px 48px;
  display:flex;flex-direction:column;align-items:center;text-align:center;
  color:var(--color-on-dark);
  position:relative;
  overflow:hidden;
}
.cta-content::before{
  content:"";position:absolute;
  background-image:url('/assets/images/backpic/back-3.webp');
  background-size:cover;background-position:center;
  opacity:.18;inset:0;
}
.cta-content>*{position:relative;z-index:1}
.cta-title{font-size:clamp(1.5rem,3vw,2rem);font-weight:700;margin-bottom:10px}
.cta-subtitle{font-size:.95rem;color:rgba(250,246,239,.7);margin-bottom:28px;max-width:500px}
.cta-buttons{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.cta-note{font-size:13px;color:rgba(250,246,239,.45);margin-top:16px}

/* ===== footer ===== */
.site-footer{
  background:var(--color-primary-deeper);
  color:rgba(250,246,239,.85);
  padding-top:64px;
  font-size:14px;
}
.footer-grid{
  display:grid;grid-template-columns:1.2fr 1fr 1fr 1.2fr;
  gap:40px;
  padding-bottom:48px;
}
.footer-brand .brand{margin-bottom:14px}
.footer-brand .brand-name{color:var(--color-on-dark)}
.footer-brand-desc{font-size:13px;color:rgba(250,246,239,.5);line-height:1.8;max-width:260px;margin-top:10px}
.footer-col-title{font-size:15px;font-weight:600;color:var(--color-on-dark);margin-bottom:16px;letter-spacing:.5px}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:10px}
.footer-links a{color:rgba(250,246,239,.6);font-size:14px;transition:color .24s var(--ease)}
.footer-links a:hover{color:var(--color-accent)}
.footer-grid p{color:rgba(250,246,239,.5);margin-bottom:8px;font-size:14px}
.footer-qr{display:flex;align-items:center;gap:16px;margin-top:14px}
.footer-qr-box{
  width:88px;height:88px;border-radius:12px;
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.12);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;color:rgba(250,246,239,.55);
  text-align:center;
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:20px 0;
  display:flex;align-items:center;justify-content:space-between;
  gap:16px;
  font-size:13px;
  color:rgba(250,246,239,.4);
  flex-wrap:wrap;
}
.footer-bottom a{color:rgba(250,246,239,.55);transition:color .24s}
.footer-bottom a:hover{color:var(--color-accent)}
.footer-status{display:flex;align-items:center;gap:6px;font-size:13px;color:rgba(250,246,239,.55)}
.footer-status .dot{width:7px;height:7px;border-radius:50%;background:var(--color-success);display:inline-block;box-shadow:0 0 6px rgba(46,125,91,.8);}

/* ===== responsive ===== */
@media(max-width:1023px){
  .header-nav{flex-direction:column;align-items:flex-start;height:auto;padding:8px 0;display:none}
  .header-nav.open{display:flex}
  .nav-links{flex-wrap:wrap;gap:4px}
  .nav-links a{height:38px;padding:0 10px}
  .header-menu-btn{display:flex}
  .header-hotwords{flex-wrap:wrap;margin-top:4px}
  .category-hero .container{grid-template-columns:1fr;gap:36px}
  .hero-visual{max-width:520px}
  .methods-grid{grid-template-columns:1fr}
  .req-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:767px){
  .header-top{height:52px}
  .header-download-btn{display:none}
  .header-nav{width:100%;padding:12px 0}
  .nav-links{width:100%;flex-direction:column;gap:0}
  .nav-links li{width:100%}
  .nav-links a{width:100%;height:44px;justify-content:flex-start}
  .nav-links a.active::after{left:0;right:auto;width:3px;height:20px;top:12px}
  .header-hotwords{width:100%;justify-content:flex-start;flex-wrap:wrap}
  .category-hero{padding:50px 0 60px}
  .category-hero h1{font-size:1.7rem}
  .category-hero h1 em::after{bottom:2px;height:3px}
  .hero-trust{gap:14px}
  .hero-cta-group{flex-direction:column}
  .btn-primary,.btn-secondary{width:100%}
  .methods-grid{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:1fr}
  .req-grid{grid-template-columns:1fr}
  .subtopic-item{flex-wrap:wrap;padding:14px 18px;height:auto;gap:8px}
  .subtopic-info{flex-direction:column;align-items:flex-start;gap:2px}
  .subtopic-arrow{display:none}
  .faq-question{height:auto;padding:16px 18px}
  .cta-content{padding:40px 24px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}