/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2E5BFF;
            --primary-hover: #1E45CC;
            --primary-light: #EEF3FA;
            --accent: #10B981;
            --accent-hover: #0EA371;
            --accent-light: #D1FAE5;
            --bg: #F6F8FC;
            --card-bg: #FFFFFF;
            --text: #1E293B;
            --text-secondary: #52607A;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --radius: 14px;
            --radius-sm: 10px;
            --shadow: 0 1px 3px rgba(30, 41, 59, 0.06), 0 4px 12px rgba(30, 41, 59, 0.06);
            --shadow-hover: 0 4px 8px rgba(30, 41, 59, 0.08), 0 10px 24px rgba(30, 41, 59, 0.10);
            --transition: all 0.25s ease;
            --container-w: 1100px;
            --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

        /* ===== Reset / Base ===== */
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }
        body {
            font-family: var(--font-stack);
            background: var(--bg);
            color: var(--text);
            line-height: 1.65;
            font-size: 15px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-hover);
        }
        ul, ol {
            list-style: none;
        }
        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
        }
        .container {
            max-width: var(--container-w);
            margin: 0 auto;
            padding: 0 20px;
        }
        .row {
            max-width: var(--container-w);
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-hover);
        }
        .btn-primary:active {
            transform: translateY(0);
            background: #1635A8;
        }
        .btn-primary:focus-visible,
        .btn-outline:focus-visible,
        .btn-accent:focus-visible {
            outline: 2px solid rgba(37, 99, 235, 0.3);
            outline-offset: 2px;
        }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: rgba(46, 91, 255, 0.05);
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
        }
        .btn-white:hover {
            background: var(--primary-light);
            color: var(--primary-hover);
            transform: translateY(-1px);
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary);
            line-height: 1.4;
        }
        .badge-green {
            background: var(--accent-light);
            color: var(--accent-hover);
        }
        .badge-gray {
            background: #F1F5F9;
            color: var(--text-secondary);
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 16px;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 0 20px;
        }
        .nav-capsule {
            max-width: 1100px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border);
            border-radius: 999px;
            box-shadow: var(--shadow);
            padding: 8px 16px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .nav-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }
        .nav-logo i {
            color: var(--primary);
            font-size: 18px;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-menu a {
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-secondary);
        }
        .nav-menu a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav-menu a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 22px;
            color: var(--text);
            cursor: pointer;
            padding: 6px 10px;
            border-radius: 8px;
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }
        @media (max-width: 820px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                position: absolute;
                top: calc(100% + 8px);
                left: 20px;
                right: 20px;
                background: rgba(255, 255, 255, 0.96);
                backdrop-filter: blur(12px);
                border: 1px solid var(--border);
                border-radius: 20px;
                box-shadow: var(--shadow-hover);
                padding: 12px;
                flex-direction: column;
                align-items: stretch;
                gap: 6px;
                display: none;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 12px 16px;
                text-align: center;
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            padding: 140px 0 80px;
            background: linear-gradient(135deg, #EEF3FA 0%, #F6F8FC 60%, #F8FAFE 100%);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            top: 0;
            right: 0;
            width: 45%;
            height: 100%;
            background: url('/assets/images/backpic/back-1.jpg') no-repeat center center / cover;
            opacity: 0.18;
            border-radius: 0 0 0 60px;
            pointer-events: none;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.8);
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 20px;
        }
        .hero-tag i {
            color: var(--accent);
        }
        .hero h1 {
            font-size: 36px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .hero h1 span {
            color: var(--primary);
        }
        .hero-desc {
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-secondary);
            max-width: 520px;
            margin-bottom: 28px;
        }
        .hero-ctas {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 32px;
        }
        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
        .trust-item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.75);
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 6px 14px;
        }
        .trust-item i {
            color: var(--accent);
            font-size: 13px;
        }
        /* Hero 右侧信息面板 */
        .hero-panel {
            background: var(--card-bg);
            border-radius: 20px;
            box-shadow: var(--shadow-hover);
            border: 1px solid var(--border);
            padding: 28px;
            position: relative;
            overflow: hidden;
        }
        .panel-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }
        .panel-top .panel-label {
            font-size: 13px;
            font-weight: 500;
            color: var(--text-muted);
        }
        .panel-top .panel-update {
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            background: var(--accent-light);
            padding: 4px 12px;
            border-radius: 999px;
        }
        .panel-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            margin-bottom: 20px;
        }
        .panel-stat {
            background: var(--bg);
            border-radius: 14px;
            padding: 16px;
            text-align: center;
        }
        .panel-stat .num {
            font-size: 26px;
            font-weight: 700;
            color: var(--primary);
            font-feature-settings: "tnum";
            line-height: 1.2;
        }
        .panel-stat .label {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }
        .panel-cats {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .panel-cat {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 14px;
            background: var(--bg);
            border-radius: 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text);
            transition: var(--transition);
        }
        .panel-cat:hover {
            background: var(--primary-light);
            color: var(--primary);
            transform: translateX(4px);
        }
        .panel-cat i {
            color: var(--text-muted);
            font-size: 13px;
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 72px 0;
        }
        .section-header {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        .section-header .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-light);
            padding: 5px 14px;
            border-radius: 999px;
            margin-bottom: 14px;
        }
        .section-header h2 {
            font-size: 28px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }
        .section-header p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ===== 卖点三连 ===== */
        .feat-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 28px 24px;
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .feat-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(46, 91, 255, 0.3);
        }
        .feat-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            background: rgba(46, 91, 255, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 18px;
        }
        .feat-card h3 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text);
        }
        .feat-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
        }

        /* ===== 场景演示 ===== */
        .scene-section {
            background: var(--card-bg);
            border-radius: 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 40px;
            margin-bottom: 24px;
            transition: var(--transition);
            overflow: hidden;
        }
        .scene-section:hover {
            box-shadow: var(--shadow-hover);
        }
        .scene-img {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
            height: 260px;
        }
        .scene-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .scene-section:hover .scene-img img {
            transform: scale(1.03);
        }
        .scene-content h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 14px;
        }
        .scene-content .scene-desc {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 18px;
            line-height: 1.65;
        }
        .scene-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-bottom: 20px;
        }
        .scene-list li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text);
            line-height: 1.5;
        }
        .scene-list li i {
            color: var(--primary);
            font-size: 14px;
            margin-top: 3px;
            flex-shrink: 0;
        }

        /* ===== 爆款清单 ===== */
        .hot-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .hot-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(46, 91, 255, 0.25);
        }
        .hot-card-img {
            height: 160px;
            overflow: hidden;
            position: relative;
        }
        .hot-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .hot-card:hover .hot-card-img img {
            transform: scale(1.05);
        }
        .hot-card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
        }
        .hot-card-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .hot-card-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .hot-card-body p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.55;
            flex: 1;
            margin-bottom: 14px;
        }
        .hot-card-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 14px;
            border-top: 1px solid var(--border);
        }
        .hot-card-footer .btn-sm {
            padding: 7px 16px;
            font-size: 13px;
            border-radius: 999px;
        }

        /* ===== 数据统计 + 评价 ===== */
        .stats-band {
            background: var(--card-bg);
            border-radius: 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 40px 24px;
            margin-bottom: 36px;
        }
        .stat-item {
            text-align: center;
            padding: 16px 8px;
        }
        .stat-item .num {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            font-feature-settings: "tnum";
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 6px;
        }
        .eval-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 24px;
            height: 100%;
            position: relative;
            transition: var(--transition);
        }
        .eval-card:hover {
            box-shadow: var(--shadow-hover);
        }
        .eval-card::before {
            content: "\201C";
            font-size: 60px;
            color: var(--primary);
            opacity: 0.15;
            position: absolute;
            top: 6px;
            left: 16px;
            line-height: 1;
            font-family: Georgia, serif;
        }
        .eval-card p {
            font-size: 14px;
            color: var(--text);
            line-height: 1.65;
            margin-bottom: 16px;
            padding-top: 14px;
        }
        .eval-meta {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .eval-meta i {
            color: var(--accent);
        }

        /* ===== 资讯区 ===== */
        .news-section {
            background: var(--card-bg);
            border-radius: 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            padding: 36px;
        }
        .news-list-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border);
            transition: var(--transition);
        }
        .news-list-item:last-child {
            border-bottom: none;
        }
        .news-list-item:hover {
            padding-left: 8px;
        }
        .news-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            flex-shrink: 0;
        }
        .news-content {
            flex: 1;
        }
        .news-content h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 2px;
        }
        .news-content span {
            font-size: 12px;
            color: var(--text-muted);
        }
        .news-recommend {
            padding: 24px;
            background: var(--bg);
            border-radius: 16px;
        }
        .news-recommend h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 14px;
        }
        .news-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .news-tags a {
            font-size: 13px;
            color: var(--text-secondary);
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 999px;
            padding: 6px 14px;
            transition: var(--transition);
        }
        .news-tags a:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary);
        }

        /* ===== FAQ ===== */
        .faq-item {
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            margin-bottom: 10px;
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(46, 91, 255, 0.3);
        }
        .faq-item summary {
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            padding: 18px 22px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            list-style: none;
            user-select: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: "+";
            font-size: 24px;
            font-weight: 300;
            color: var(--primary);
            transition: transform 0.3s ease;
            flex-shrink: 0;
            line-height: 1;
        }
        .faq-item[open] summary::after {
            content: "\2013";
            transform: rotate(0deg);
        }
        .faq-item .answer {
            padding: 0 22px 18px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.65;
            border-top: 1px solid var(--border);
            padding-top: 14px;
        }
        .faq-footer {
            text-align: center;
            margin-top: 24px;
            font-size: 14px;
            color: var(--text-secondary);
        }
        .faq-footer a {
            font-weight: 500;
        }

        /* ===== CTA 横幅 ===== */
        .cta-banner {
            background: var(--primary);
            border-radius: 20px;
            padding: 52px 40px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-banner::before {
            content: "";
            position: absolute;
            top: -40px;
            right: -40px;
            width: 180px;
            height: 180px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 50%;
        }
        .cta-banner::after {
            content: "";
            position: absolute;
            bottom: -60px;
            left: -20px;
            width: 140px;
            height: 140px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
        }
        .cta-banner h2 {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 10px;
            position: relative;
            z-index: 1;
        }
        .cta-banner p {
            font-size: 15px;
            opacity: 0.85;
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
        }
        .cta-banner .btn-white {
            position: relative;
            z-index: 1;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #F1F5F9;
            border-top: 1px solid var(--border);
            padding: 56px 0 20px;
            margin-top: 20px;
        }
        .footer-brand {
            margin-bottom: 24px;
        }
        .footer-logo {
            font-size: 22px;
            font-weight: 700;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
        }
        .footer-logo i {
            color: var(--primary);
        }
        .footer-brand p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            max-width: 280px;
            margin-bottom: 14px;
        }
        .footer-brand .copyright {
            font-size: 12px;
            color: var(--text-muted);
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-secondary);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            margin-top: 36px;
            padding-top: 20px;
            text-align: center;
            font-size: 12px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 32px;
            }
            .scene-img {
                height: 220px;
            }
        }
        @media (max-width: 820px) {
            .section {
                padding: 48px 0;
            }
            .hero {
                padding: 120px 0 56px;
            }
            .hero-bg {
                width: 70%;
            }
            .hero-panel {
                margin-top: 32px;
            }
            .scene-section {
                padding: 28px;
            }
            .cta-banner {
                padding: 40px 24px;
            }
        }
        @media (max-width: 520px) {
            .hero h1 {
                font-size: 26px;
            }
            .hero-ctas .btn {
                width: 100%;
            }
            .hero-trust {
                justify-content: center;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .scene-section {
                padding: 20px;
            }
            .hot-card-img {
                height: 140px;
            }
            .stats-band {
                padding: 24px 16px;
            }
            .news-section {
                padding: 24px 18px;
            }
            .cta-banner h2 {
                font-size: 22px;
            }
            .footer-col {
                margin-bottom: 24px;
            }
        }

        /* 浮动固定CTA条（移动端） */
        .mobile-cta {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            border-top: 1px solid var(--border);
            padding: 12px 16px;
            box-shadow: 0 -2px 12px rgba(30, 41, 59, 0.06);
        }
        .mobile-cta .btn {
            width: 100%;
        }
        @media (max-width: 640px) {
            .mobile-cta {
                display: block;
            }
            body {
                padding-bottom: 70px;
            }
        }

        /* 图片圆角统一 */
        .rounded-img {
            border-radius: 16px;
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
:root {
    --primary: #2E5BFF;
    --primary-hover: #1E45CC;
    --primary-light: #EEF3FA;
    --accent: #10B981;
    --accent-hover: #0EA371;
    --accent-light: #D1FAE5;
    --bg: #F6F8FC;
    --card-bg: #FFFFFF;
    --text: #1E293B;
    --text-secondary: #52607A;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --radius: 14px;
    --radius-sm: 10px;
    --shadow: 0 1px 3px rgba(30, 41, 59, 0.06), 0 4px 12px rgba(30, 41, 59, 0.06);
    --shadow-hover: 0 4px 8px rgba(30, 41, 59, 0.08), 0 10px 24px rgba(30, 41, 59, 0.10);
    --transition: all 0.25s ease;
    --container-w: 1100px;
    --font-stack: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

/* ===== 基础 Reset ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}
body {
    font-family: var(--font-stack);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    font-size: 15px;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
}
a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--primary-hover);
}
button,
input,
textarea {
    font-family: inherit;
    font-size: inherit;
}
ul {
    list-style: none;
}
.container {
    max-width: var(--container-w);
    margin: 0 auto;
    padding: 0 20px;
}
.row {
    max-width: var(--container-w);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.2;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}
.btn-primary:active {
    transform: translateY(0);
    background: #1635A8;
}
.btn-primary:focus-visible,
.btn-outline:focus-visible,
.btn-accent:focus-visible {
    outline: 2px solid rgba(37, 99, 235, 0.3);
    outline-offset: 2px;
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--primary);
}
.btn-outline:hover {
    background: rgba(46, 91, 255, 0.05);
    border-color: var(--primary);
    color: var(--primary);
}
.btn-accent {
    background: var(--accent);
    color: #fff;
}
.btn-accent:hover {
    background: var(--accent-hover);
    color: #fff;
    transform: translateY(-1px);
}
.btn-white {
    background: #fff;
    color: var(--primary);
}
.btn-white:hover {
    background: var(--primary-light);
    color: var(--primary-hover);
    transform: translateY(-1px);
}
.btn-sm {
    padding: 8px 18px;
    font-size: 14px;
}
.btn-block {
    width: 100%;
}

/* ===== 徽章 / 标签 ===== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 500;
    background: var(--primary-light);
    color: var(--primary);
    line-height: 1.4;
}
.badge-green {
    background: var(--accent-light);
    color: var(--accent-hover);
}
.badge-gray {
    background: #F1F5F9;
    color: var(--text-secondary);
}

/* ===== 导航 ===== */
.site-header {
    position: fixed;
    top: 16px;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 20px;
}
.nav-capsule {
    max-width: var(--container-w);
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: 999px;
    box-shadow: var(--shadow);
    padding: 8px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}
.nav-logo i {
    color: var(--primary);
    font-size: 18px;
}
.nav-menu {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-menu a {
    padding: 8px 16px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}
.nav-menu a:hover {
    background: var(--primary-light);
    color: var(--primary);
}
.nav-menu a.active {
    background: var(--primary);
    color: #fff;
}
.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 22px;
    color: var(--text);
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 8px;
}
.nav-toggle:hover {
    background: var(--primary-light);
}

/* ===== 面包屑 ===== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 14px;
}
.breadcrumb a {
    color: var(--text-secondary);
}
.breadcrumb a:hover {
    color: var(--primary);
}
.breadcrumb i {
    font-size: 10px;
    color: var(--text-muted);
}

/* ===== 分类页头 ===== */
.category-hero {
    position: relative;
    padding: 120px 0 72px;
    background: linear-gradient(135deg, #EEF3FA 0%, #F6F8FC 60%, #FFFFFF 100%);
    overflow: hidden;
}
.category-hero .hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 45%;
    height: 100%;
    background: url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
    opacity: 0.10;
    border-radius: 0 0 0 80px;
    pointer-events: none;
}
.hero-content {
    position: relative;
    z-index: 2;
}
.hero-content h1 {
    font-size: 34px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 14px;
    color: var(--text);
}
.hero-content h1 span {
    color: var(--primary);
}
.hero-content .lead {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 440px;
    margin-bottom: 24px;
}
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}
.hero-trust {
    display: flex;
    gap: 14px;
    margin-top: 28px;
    flex-wrap: wrap;
}

/* ===== 进度环面板 ===== */
.progress-panel {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    padding: 32px 24px 24px;
    text-align: center;
    position: relative;
    z-index: 2;
    max-width: 360px;
    margin: 0 auto;
}
.progress-ring-wrap {
    position: relative;
    width: 170px;
    height: 170px;
    margin: 0 auto 16px;
}
.progress-ring {
    width: 100%;
    height: 100%;
}
.progress-ring-bg {
    fill: none;
    stroke: #F1F5F9;
    stroke-width: 10;
}
.progress-ring-bar {
    fill: none;
    stroke: var(--primary);
    stroke-width: 10;
    stroke-linecap: round;
    stroke-dasharray: 326.73;
    stroke-dashoffset: 71.88;
    transform: rotate(-90deg);
    transform-origin: center;
}
.progress-ring-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}
.progress-ring-center strong {
    font-size: 30px;
    font-weight: 700;
    color: var(--text);
    display: block;
    font-feature-settings: "tnum";
    line-height: 1.2;
}
.progress-ring-center span {
    font-size: 12px;
    color: var(--text-muted);
}
.progress-stats {
    display: flex;
    justify-content: space-around;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 4px;
}
.stat-item {
    text-align: center;
}
.stat-item strong {
    display: block;
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    font-feature-settings: "tnum";
    line-height: 1.3;
}
.stat-item span {
    font-size: 12px;
    color: var(--text-muted);
}

/* ===== 筛选工具条 ===== */
.filter-bar {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 18px 0;
}
.filter-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}
.filter-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.filter-tag {
    display: inline-flex;
    padding: 6px 16px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    background: var(--bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    cursor: default;
    transition: var(--transition);
}
.filter-tag:hover {
    border-color: var(--primary);
    color: var(--primary);
}
.filter-tag.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.filter-count {
    font-size: 13px;
    color: var(--text-muted);
}
.filter-count strong {
    color: var(--text);
    font-weight: 600;
}

/* ===== 视频卡片列表 ===== */
.video-grid-section {
    padding: 72px 0;
}
.section-head {
    margin-bottom: 36px;
}
.section-head h2 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}
.section-head p {
    color: var(--text-secondary);
    font-size: 14px;
}
.video-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: var(--transition);
}
.video-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    border-color: rgba(46, 91, 255, 0.3);
}
.card-thumb {
    position: relative;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--primary-light);
}
.card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.video-card:hover .card-thumb img {
    transform: scale(1.04);
}
.thumb-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 2;
}
.card-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.card-body h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.card-body p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.card-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}
.card-body .btn {
    margin-top: auto;
}

/* ===== CTA 横幅 ===== */
.cta-section {
    padding: 0 0 72px;
}
.cta-banner {
    background: var(--primary-light);
    border-radius: 20px;
    padding: 48px 32px;
    text-align: center;
    border: 1px solid rgba(46, 91, 255, 0.12);
}
.cta-banner h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}
.cta-banner p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

/* ===== FAQ ===== */
.faq-section {
    padding: 0 0 72px;
}
.faq-list {
    max-width: 820px;
    margin: 0 auto;
}
.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 10px;
    transition: var(--transition);
    overflow: hidden;
}
.faq-item:hover {
    border-color: rgba(46, 91, 255, 0.4);
}
.faq-item summary {
    padding: 16px 20px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    transition: var(--transition);
}
.faq-item summary::-webkit-details-marker {
    display: none;
}
.faq-item summary::after {
    content: '\f067';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 14px;
    color: var(--primary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}
.faq-item[open] summary::after {
    transform: rotate(45deg);
}
.faq-content {
    padding: 0 20px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.65;
}
.faq-more {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-secondary);
}
.faq-more a {
    font-weight: 500;
}

/* ===== 页脚 ===== */
.site-footer {
    background: #F1F5F9;
    border-top: 1px solid var(--border);
    padding: 56px 0 0;
    margin-top: 24px;
}
.footer-brand {
    margin-bottom: 16px;
}
.footer-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 10px;
}
.footer-logo i {
    color: var(--primary);
    font-size: 18px;
}
.footer-brand p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 280px;
}
.copyright {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 14px;
}
.footer-col h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 12px;
}
.footer-col ul li {
    margin-bottom: 8px;
}
.footer-col ul li a {
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition);
}
.footer-col ul li a:hover {
    color: var(--primary);
}
.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 16px 0;
    margin-top: 32px;
}
.footer-bottom p {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .category-hero {
        padding: 110px 0 56px;
    }
    .hero-content h1 {
        font-size: 30px;
    }
    .video-grid-section {
        padding: 56px 0;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    .nav-menu {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        border: 1px solid var(--border);
        border-radius: 16px;
        box-shadow: var(--shadow-hover);
        padding: 12px;
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
    }
    .nav-menu.open {
        display: flex;
    }
    .nav-menu a {
        padding: 12px 16px;
        text-align: center;
    }
    .category-hero {
        padding: 100px 0 48px;
    }
    .hero-content h1 {
        font-size: 26px;
    }
    .hero-content .lead {
        font-size: 15px;
    }
    .progress-panel {
        margin-top: 28px;
        max-width: 300px;
    }
    .filter-wrap {
        justify-content: center;
    }
    .filter-count {
        width: 100%;
        text-align: center;
    }
    .video-grid-section {
        padding: 48px 0;
    }
    .section-head h2 {
        font-size: 22px;
    }
    .cta-banner {
        padding: 36px 20px;
    }
    .cta-banner h2 {
        font-size: 20px;
    }
    .faq-section {
        padding: 0 0 48px;
    }
    .faq-item summary {
        font-size: 15px;
        padding: 14px 16px;
    }
    .faq-content {
        padding: 0 16px 14px;
    }
    .site-footer {
        padding: 40px 0 0;
    }
    .footer-col {
        margin-bottom: 20px;
    }
}

@media (max-width: 520px) {
    .hero-actions .btn {
        width: 100%;
    }
    .filter-tags {
        gap: 6px;
    }
    .filter-tag {
        padding: 5px 12px;
        font-size: 12px;
    }
}