/* roulang page: index */
:root {
            --primary: #16324f;
            --primary-dark: #0f2339;
            --primary-light: #1e4468;
            --accent: #d0a03c;
            --accent-light: #e6bc5e;
            --bg: #f5f7fb;
            --bg-deep: #eef1f6;
            --text: #111c2a;
            --text-light: #536779;
            --border: #dfe5ed;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 8px 30px rgba(15, 28, 46, 0.08);
            --shadow-lg: 0 16px 44px rgba(15, 28, 46, 0.13);
            --section-pad: 96px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
            line-height: 1.65;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color .25s ease;
        }
        button,
        input {
            font-family: inherit;
        }
        .container-main {
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 28px;
        }
        @media (max-width: 768px) {
            .container-main {
                padding: 0 20px;
            }
        }
        /* ===== Top bar ===== */
        .topbar {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.82);
            font-size: 13px;
            padding: 8px 0;
        }
        .topbar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .topbar-inner .topbar-left {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .topbar-inner .topbar-left i {
            color: var(--accent);
            font-size: 14px;
        }
        .topbar-inner .topbar-right {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .topbar-right span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .topbar-badge {
            background: var(--accent);
            color: var(--primary-dark);
            font-size: 11px;
            font-weight: 700;
            padding: 2px 10px;
            border-radius: 20px;
        }
        @media (max-width: 640px) {
            .topbar-inner {
                justify-content: center;
                text-align: center;
            }
            .topbar-right {
                display: none !important;
            }
        }
        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 60;
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(223, 229, 237, 0.7);
            box-shadow: 0 2px 18px rgba(15, 28, 46, 0.04);
        }
        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
            gap: 20px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 19px;
            letter-spacing: 0.5px;
            color: var(--primary);
            white-space: nowrap;
        }
        .site-logo .logo-icon {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            box-shadow: 0 4px 12px rgba(22, 50, 79, 0.3);
            flex-shrink: 0;
        }
        .site-logo em {
            font-style: normal;
            color: var(--accent);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 4px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-menu li a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 20px;
            border-radius: 30px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text);
            transition: all .25s ease;
        }
        .nav-menu li a:hover {
            color: var(--primary);
            background: rgba(22, 50, 79, 0.06);
        }
        .nav-menu li a.active {
            color: var(--primary);
            background: rgba(22, 50, 79, 0.08);
            font-weight: 600;
        }
        .nav-menu li a.active::after {
            content: '';
            display: block;
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background: var(--accent);
            margin-left: 2px;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            padding: 11px 26px;
            border-radius: 30px;
            font-size: 15px;
            transition: all .28s ease;
            box-shadow: 0 4px 14px rgba(22, 50, 79, 0.25);
        }
        .nav-cta:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(22, 50, 79, 0.3);
            color: #fff;
        }
        .nav-cta i {
            font-size: 14px;
        }
        .nav-toggle {
            display: none;
            width: 42px;
            height: 42px;
            border: 1px solid var(--border);
            border-radius: 10px;
            background: #fff;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 20px;
        }
        @media (max-width: 768px) {
            .nav-cta {
                display: none;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .nav-menu {
                position: absolute;
                top: 76px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                align-items: stretch;
                padding: 18px 20px 22px;
                box-shadow: 0 16px 40px rgba(15, 28, 46, 0.12);
                border-bottom: 1px solid var(--border);
                display: none;
                border-radius: 0 0 20px 20px;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu li a {
                padding: 14px 18px;
                border-radius: 10px;
                justify-content: flex-start;
            }
        }
        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 620px;
            display: flex;
            align-items: center;
            background: linear-gradient(120deg, rgba(9, 22, 38, 0.94) 0%, rgba(16, 35, 56, 0.88) 48%, rgba(22, 50, 79, 0.78) 100%),
                url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            color: #fff;
            overflow: hidden;
        }
        .hero::after {
            content: '';
            position: absolute;
            right: -120px;
            bottom: -120px;
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(208, 160, 60, 0.22), transparent 70%);
            pointer-events: none;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            max-width: 760px;
            padding: 90px 0 100px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            border: 1px solid rgba(255, 255, 255, 0.18);
            color: #fff;
            font-size: 14px;
            font-weight: 500;
            padding: 8px 18px;
            border-radius: 40px;
            margin-bottom: 26px;
        }
        .hero-badge i {
            color: var(--accent);
        }
        .hero h1 {
            font-size: clamp(32px, 5vw, 54px);
            font-weight: 800;
            line-height: 1.18;
            letter-spacing: 1px;
            margin: 0 0 22px;
        }
        .hero h1 span {
            color: var(--accent);
        }
        .hero p {
            font-size: 18px;
            line-height: 1.75;
            color: rgba(255, 255, 255, 0.82);
            max-width: 600px;
            margin-bottom: 38px;
        }
        .hero-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 700;
            font-size: 16px;
            padding: 14px 36px;
            border-radius: 40px;
            transition: all .28s ease;
            box-shadow: 0 6px 20px rgba(208, 160, 60, 0.4);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(208, 160, 60, 0.45);
            color: var(--primary-dark);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.28);
            color: #fff;
            font-weight: 600;
            font-size: 16px;
            padding: 14px 32px;
            border-radius: 40px;
            transition: all .28s ease;
        }
        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.16);
            border-color: rgba(255, 255, 255, 0.45);
            color: #fff;
            transform: translateY(-2px);
        }
        .hero-metrics {
            display: flex;
            align-items: center;
            gap: 34px;
            margin-top: 56px;
            flex-wrap: wrap;
        }
        .hero-metrics .metric {
            text-align: left;
        }
        .hero-metrics .metric strong {
            display: block;
            font-size: 28px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .hero-metrics .metric span {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
        }
        @media (max-width: 640px) {
            .hero {
                min-height: 520px;
            }
            .hero-inner {
                padding: 60px 0 70px;
            }
            .hero p {
                font-size: 16px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-ghost {
                justify-content: center;
            }
            .hero-metrics {
                gap: 22px;
                margin-top: 42px;
            }
        }
        /* ===== Section ===== */
        .section {
            padding: var(--section-pad) 0;
        }
        .section-white {
            background: #fff;
        }
        .section-light {
            background: var(--bg-deep);
        }
        .section-head {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }
        .section-head .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(22, 50, 79, 0.07);
            padding: 6px 18px;
            border-radius: 30px;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 16px;
        }
        .section-head h2 {
            font-size: clamp(26px, 3.6vw, 36px);
            font-weight: 800;
            color: var(--primary);
            line-height: 1.3;
            margin: 0 0 14px;
        }
        .section-head p {
            font-size: 16px;
            color: var(--text-light);
            line-height: 1.7;
            margin: 0;
        }
        @media (max-width: 768px) {
            :root {
                --section-pad: 64px;
            }
            .section-head {
                margin-bottom: 40px;
            }
        }
        /* ===== Card base ===== */
        .card {
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            padding: 30px;
            transition: all .3s ease;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(208, 160, 60, 0.35);
        }
        /* ===== Platform intro ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1.1fr 1fr;
            gap: 70px;
            align-items: center;
        }
        .intro-media {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }
        .intro-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 380px;
        }
        .intro-content .intro-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent);
            letter-spacing: 1px;
            margin-bottom: 14px;
        }
        .intro-content h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.3;
            margin: 0 0 20px;
        }
        .intro-content p {
            color: var(--text-light);
            font-size: 15.5px;
            line-height: 1.85;
            margin-bottom: 12px;
        }
        .intro-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            margin-top: 24px;
        }
        .intro-feature-item {
            display: flex;
            align-items: center;
            gap: 10px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 14px 16px;
            font-size: 14px;
            font-weight: 500;
        }
        .intro-feature-item i {
            color: var(--accent);
            font-size: 16px;
            flex-shrink: 0;
        }
        @media (max-width: 900px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .intro-media img {
                min-height: 260px;
            }
        }
        @media (max-width: 520px) {
            .intro-features {
                grid-template-columns: 1fr;
            }
        }
        /* ===== Category cards ===== */
        .cat-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .cat-card {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            background: #fff;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: all .32s ease;
        }
        .cat-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }
        .cat-card .cat-img {
            position: relative;
            height: 210px;
            overflow: hidden;
        }
        .cat-card .cat-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .5s ease;
        }
        .cat-card:hover .cat-img img {
            transform: scale(1.05);
        }
        .cat-card .cat-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 40%, rgba(9, 22, 38, 0.45));
        }
        .cat-card .cat-tag {
            position: absolute;
            top: 16px;
            left: 16px;
            z-index: 2;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(4px);
            color: var(--primary);
            font-size: 12px;
            font-weight: 700;
            padding: 5px 14px;
            border-radius: 20px;
        }
        .cat-card .cat-body {
            padding: 26px 28px 30px;
        }
        .cat-card .cat-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 10px;
        }
        .cat-card .cat-body p {
            color: var(--text-light);
            font-size: 14.5px;
            line-height: 1.7;
            margin: 0 0 20px;
        }
        .cat-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            color: var(--primary);
            transition: all .25s ease;
        }
        .cat-link i {
            transition: transform .25s ease;
        }
        .cat-link:hover {
            color: var(--accent);
        }
        .cat-link:hover i {
            transform: translateX(4px);
        }
        @media (max-width: 768px) {
            .cat-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        /* ===== News list ===== */
        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .news-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            height: 100%;
            transition: all .3s ease;
            box-shadow: 0 2px 12px rgba(15, 28, 46, 0.04);
        }
        .news-item:hover {
            border-color: rgba(208, 160, 60, 0.4);
            box-shadow: var(--shadow);
            transform: translateY(-4px);
        }
        .news-item a {
            display: flex;
            flex-direction: column;
            gap: 12px;
            padding: 28px;
            height: 100%;
        }
        .news-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 10px;
        }
        .news-tag {
            font-size: 12px;
            font-weight: 600;
            background: rgba(22, 50, 79, 0.08);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 20px;
        }
        .news-date {
            font-size: 13px;
            color: var(--text-light);
        }
        .news-item h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text);
            line-height: 1.45;
            margin: 4px 0 0;
            transition: color .25s;
        }
        .news-item a:hover h3 {
            color: var(--primary);
        }
        .news-item p {
            color: var(--text-light);
            font-size: 14px;
            line-height: 1.65;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-more {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent);
            margin-top: auto;
            padding-top: 6px;
        }
        @media (max-width: 768px) {
            .news-list {
                grid-template-columns: 1fr;
                gap: 18px;
            }
        }
        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
        }
        .stat-card {
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            text-align: center;
            padding: 36px 24px;
            transition: all .3s ease;
        }
        .stat-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .stat-card .stat-icon {
            width: 54px;
            height: 54px;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin: 0 auto 18px;
            box-shadow: 0 6px 16px rgba(22, 50, 79, 0.22);
        }
        .stat-card .stat-num {
            font-size: 34px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-card .stat-label {
            font-size: 14px;
            color: var(--text-light);
            margin-top: 6px;
        }
        @media (max-width: 900px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }
        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: step;
        }
        .step-card {
            counter-increment: step;
            position: relative;
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 34px 28px 30px;
            box-shadow: var(--shadow);
            transition: all .3s ease;
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .step-card::before {
            content: counter(step, decimal-leading-zero);
            position: absolute;
            top: 22px;
            right: 24px;
            font-size: 38px;
            font-weight: 800;
            color: rgba(22, 50, 79, 0.08);
            line-height: 1;
        }
        .step-card .step-icon {
            width: 50px;
            height: 50px;
            border-radius: 14px;
            background: rgba(208, 160, 60, 0.12);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 18px;
        }
        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 10px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.65;
            margin: 0;
        }
        @media (max-width: 900px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }
        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 820px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 14px;
            box-shadow: 0 2px 10px rgba(15, 28, 46, 0.03);
            transition: border-color .3s, box-shadow .3s;
        }
        .faq-item:hover {
            border-color: rgba(22, 50, 79, 0.22);
            box-shadow: 0 4px 18px rgba(15, 28, 46, 0.06);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 26px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question .faq-icon {
            color: var(--accent);
            font-size: 18px;
            flex-shrink: 0;
            transition: transform .3s;
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }
        .faq-answer p {
            padding: 0 26px 22px;
            font-size: 14.5px;
            color: var(--text-light);
            line-height: 1.75;
            margin: 0;
        }
        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            background: linear-gradient(115deg, var(--primary-dark), var(--primary-light));
            border-radius: 28px;
            overflow: hidden;
            padding: 70px 60px;
            text-align: center;
            box-shadow: var(--shadow-lg);
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -80px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(208, 160, 60, 0.3), transparent 70%);
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -40px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent 70%);
        }
        .cta-section h2 {
            color: #fff;
            font-size: clamp(24px, 3vw, 34px);
            font-weight: 800;
            margin: 0 0 14px;
            position: relative;
            z-index: 1;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 16px;
            margin: 0 auto 36px;
            max-width: 500px;
            line-height: 1.7;
            position: relative;
            z-index: 1;
        }
        .cta-actions {
            position: relative;
            z-index: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
        }
        @media (max-width: 640px) {
            .cta-section {
                padding: 48px 28px;
                border-radius: 20px;
            }
            .cta-actions {
                flex-direction: column;
                width: 100%;
            }
            .cta-actions .btn-primary,
            .cta-actions .btn-ghost {
                width: 100%;
                justify-content: center;
            }
        }
        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.68);
            padding: 70px 0 0;
            margin-top: 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 50px;
            padding-bottom: 50px;
        }
        .footer-brand .site-logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.75;
            max-width: 360px;
            margin: 0 0 20px;
        }
        .footer-title {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 18px;
        }
        .footer-links {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.62);
            font-size: 14px;
            transition: color .25s;
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        /* ===== focus accessibility ===== */
        a:focus-visible,
        button:focus-visible {
            outline: 3px solid rgba(208, 160, 60, 0.5);
            outline-offset: 2px;
        }
        /* ===== animations ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(24px);
            animation: fadeUp .7s ease forwards;
        }
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg: #f1f5f9;
            --surface: #ffffff;
            --text: #0f172a;
            --muted: #64748b;
            --border: #e2e8f0;
            --radius: 18px;
            --radius-sm: 12px;
            --shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.12);
            --shadow-hover: 0 24px 48px -16px rgba(2, 12, 27, 0.22);
            --content: 1280px;
            --space: 5rem;
        }

        /* ===== 基础 reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: "Inter", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

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

        button,
        input {
            font-family: inherit;
            border: none;
            background: none;
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== 容器 ===== */
        .container-main {
            max-width: var(--content);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ===== Header / 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: saturate(180%) blur(14px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: 0 4px 20px -12px rgba(2, 12, 27, 0.15);
        }

        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 76px;
            gap: 1.5rem;
        }

        .site-logo {
            display: inline-flex;
            align-items: center;
            gap: .7rem;
            font-size: 1.35rem;
            font-weight: 700;
            letter-spacing: -.02em;
            color: var(--text);
            white-space: nowrap;
        }

        .site-logo em {
            font-style: normal;
            color: var(--primary);
        }

        .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: #fff;
            border-radius: 14px;
            font-size: 1.2rem;
            box-shadow: 0 8px 18px -8px rgba(37, 99, 235, .7);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: .5rem;
        }

        .nav-menu a {
            display: inline-flex;
            align-items: center;
            gap: .45rem;
            padding: .65rem 1.1rem;
            border-radius: 999px;
            font-size: .95rem;
            font-weight: 500;
            color: #334155;
            transition: background .25s, color .25s, transform .2s;
        }

        .nav-menu a:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .nav-menu a.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 8px 18px -8px rgba(37, 99, 235, .8);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            background: var(--primary);
            color: #fff;
            font-size: .95rem;
            font-weight: 600;
            padding: .7rem 1.4rem;
            border-radius: 999px;
            transition: background .25s, transform .2s, box-shadow .25s;
            box-shadow: 0 10px 20px -10px rgba(37, 99, 235, .8);
            white-space: nowrap;
        }

        .nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 16px 28px -12px rgba(37, 99, 235, .9);
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: 1.25rem;
            align-items: center;
            justify-content: center;
            transition: background .2s;
        }

        .nav-toggle:hover {
            background: #bfdbfe;
        }

        /* ===== 页面 Banner ===== */
        .category-banner {
            position: relative;
            min-height: 380px;
            display: flex;
            align-items: center;
            padding: 6rem 0 4rem;
            background-size: cover;
            background-position: center;
            color: #fff;
            isolation: isolate;
        }

        .category-banner::before {
            content: "";
            position: absolute;
            inset: 0;
            z-index: -1;
            background: linear-gradient(100deg, rgba(15, 23, 42, .88) 0%, rgba(37, 99, 235, .55) 55%, rgba(245, 158, 11, .25) 100%);
        }

        .banner-inner {
            max-width: 820px;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: .6rem;
            flex-wrap: wrap;
            font-size: .9rem;
            opacity: .85;
            margin-bottom: 1.2rem;
            letter-spacing: .02em;
        }

        .breadcrumb a {
            transition: color .2s;
        }

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

        .breadcrumb i {
            font-size: .75rem;
        }

        .category-banner h1 {
            font-size: clamp(2.4rem, 5vw, 3.6rem);
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -.03em;
            margin-bottom: 1rem;
        }

        .category-banner p {
            font-size: 1.15rem;
            line-height: 1.8;
            opacity: .95;
            margin-bottom: 2rem;
        }

        .banner-badges {
            display: flex;
            flex-wrap: wrap;
            gap: .75rem;
        }

        .banner-badges .badge {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            background: rgba(255, 255, 255, .15);
            border: 1px solid rgba(255, 255, 255, .28);
            padding: .5rem 1rem;
            border-radius: 999px;
            font-size: .9rem;
            font-weight: 500;
            backdrop-filter: blur(6px);
        }

        /* ===== 通用板块 ===== */
        .section-block {
            padding: var(--space) 0;
        }

        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 3rem;
        }

        .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: .85rem;
            font-weight: 600;
            padding: .35rem 1rem;
            border-radius: 999px;
            margin-bottom: 1rem;
            letter-spacing: .04em;
        }

        .section-header h2 {
            font-size: clamp(1.9rem, 3.5vw, 2.6rem);
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -.02em;
            margin-bottom: .75rem;
        }

        .section-header p {
            color: var(--muted);
            font-size: 1.05rem;
            line-height: 1.7;
        }

        /* ===== 分类内页导航卡片 ===== */
        .category-switch {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }

        .category-switch-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--surface);
            border: 1px solid var(--border);
            transition: transform .3s, box-shadow .3s, border-color .3s;
            display: flex;
            align-items: center;
            gap: 1.25rem;
            padding: 1.5rem 1.8rem;
            box-shadow: var(--shadow);
        }

        .category-switch-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: #bfdbfe;
        }

        .category-switch-card.active-card {
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, .12), var(--shadow);
        }

        .category-switch-icon {
            width: 58px;
            height: 58px;
            flex-shrink: 0;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            background: var(--primary-light);
            color: var(--primary);
        }

        .category-switch-card.active-card .category-switch-icon {
            background: var(--primary);
            color: #fff;
        }

        .category-switch-info {
            flex: 1;
        }

        .category-switch-info h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: .25rem;
        }

        .category-switch-info p {
            color: var(--muted);
            font-size: .9rem;
        }

        .category-switch-card .arrow {
            font-size: 1.1rem;
            color: var(--muted);
            transition: transform .3s, color .3s;
        }

        .category-switch-card:hover .arrow {
            transform: translateX(4px);
            color: var(--primary);
        }

        /* ===== 功能卡片 ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.8rem;
        }

        .feature-card {
            background: var(--surface);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: transform .3s, box-shadow .3s;
            display: flex;
            flex-direction: column;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }

        .feature-card img {
            width: 100%;
            height: 190px;
            object-fit: cover;
            transition: transform .5s;
        }

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

        .feature-card-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .feature-card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: .5rem;
            display: flex;
            align-items: center;
            gap: .5rem;
        }

        .feature-card-body h3 i {
            color: var(--primary);
            font-size: 1rem;
        }

        .feature-card-body p {
            color: var(--muted);
            font-size: .95rem;
            line-height: 1.7;
            flex: 1;
        }

        .feature-card .text-link {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            margin-top: 1.2rem;
            transition: gap .25s, color .2s;
        }

        .feature-card .text-link:hover {
            color: var(--primary-dark);
            gap: .7rem;
        }

        /* ===== 指南列表 ===== */
        .wise-list {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .wise-item {
            display: flex;
            align-items: center;
            gap: 1.5rem;
            padding: 1.5rem 2rem;
            border-bottom: 1px solid var(--border);
            transition: background .25s;
        }

        .wise-item:last-child {
            border-bottom: 0;
        }

        .wise-item:hover {
            background: #f8fafc;
        }

        .wise-index {
            width: 46px;
            height: 46px;
            border-radius: 14px;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-weight: 800;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .wise-item:nth-child(even) .wise-index {
            background: #fef3c7;
            color: var(--accent-dark);
        }

        .wise-content {
            flex: 1;
            min-width: 0;
        }

        .wise-tags {
            display: flex;
            gap: .5rem;
            margin-bottom: .35rem;
            flex-wrap: wrap;
        }

        .min-tag {
            display: inline-block;
            font-size: .78rem;
            font-weight: 600;
            padding: .15rem .7rem;
            border-radius: 999px;
            background: #f1f5f9;
            color: #475569;
            border: 1px solid var(--border);
        }

        .min-tag.blue {
            background: var(--primary-light);
            color: var(--primary-dark);
            border-color: #bfdbfe;
        }

        .wise-content h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: .3rem;
            line-height: 1.4;
            transition: color .2s;
        }

        .wise-content h4 a:hover {
            color: var(--primary);
        }

        .wise-content p {
            color: var(--muted);
            font-size: .92rem;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .wise-link {
            color: var(--primary);
            font-weight: 600;
            font-size: .95rem;
            white-space: nowrap;
            display: inline-flex;
            align-items: center;
            gap: .35rem;
            transition: gap .2s;
        }

        .wise-link:hover {
            gap: .7rem;
        }

        /* ===== 步骤流程 ===== */
        .steps-wrap {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            counter-reset: step;
        }

        .step-card {
            position: relative;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 2.2rem 1.8rem 1.8rem;
            box-shadow: var(--shadow);
            transition: transform .3s, box-shadow .3s;
            overflow: hidden;
        }

        .step-card::before {
            counter-increment: step;
            content: "0" counter(step);
            position: absolute;
            top: 1rem;
            right: 1.4rem;
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary-light);
            line-height: 1;
            z-index: 0;
        }

        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }

        .step-icon {
            width: 62px;
            height: 62px;
            border-radius: 18px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1.2rem;
            position: relative;
            z-index: 1;
        }

        .step-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: .5rem;
            position: relative;
            z-index: 1;
        }

        .step-card p {
            color: var(--muted);
            font-size: .95rem;
            position: relative;
            z-index: 1;
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            border-radius: 2rem;
            color: #fff;
            padding: 3.5rem 2.5rem;
            position: relative;
            overflow: hidden;
        }

        .stats-section::before {
            content: "";
            position: absolute;
            width: 280px;
            height: 280px;
            background: radial-gradient(circle, rgba(37, 99, 235, .35) 0%, transparent 70%);
            top: -80px;
            right: -60px;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: .4rem;
        }

        .stat-num {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -.02em;
            background: linear-gradient(120deg, #fff, #93c5fd);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .stat-label {
            font-size: .95rem;
            color: #cbd5e1;
            font-weight: 500;
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: box-shadow .25s, border-color .25s;
        }

        .faq-item[open] {
            border-color: #bfdbfe;
            box-shadow: var(--shadow);
        }

        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.25rem 1.6rem;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary i {
            color: var(--primary);
            transition: transform .35s;
            flex-shrink: 0;
        }

        .faq-item[open] summary i {
            transform: rotate(180deg);
        }

        .faq-item .faq-answer {
            padding: 0 1.6rem 1.4rem;
            color: var(--muted);
            line-height: 1.75;
            font-size: .98rem;
        }

        /* ===== CTA ===== */
        .cta-panel {
            position: relative;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 60%, #1e3a8a 100%);
            border-radius: 2rem;
            padding: 4rem 2.5rem;
            text-align: center;
            color: #fff;
            overflow: hidden;
            box-shadow: 0 24px 50px -18px rgba(37, 99, 235, .8);
        }

        .cta-panel::before {
            content: "";
            position: absolute;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 255, 255, .16) 0%, transparent 65%);
            top: -130px;
            left: -100px;
        }

        .cta-panel h2 {
            font-size: clamp(1.8rem, 3vw, 2.4rem);
            font-weight: 800;
            margin-bottom: .75rem;
        }

        .cta-panel p {
            font-size: 1.1rem;
            opacity: .9;
            margin-bottom: 2rem;
        }

        .cta-btns {
            display: flex;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
        }

        .btn-white,
        .btn-ghost-white {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            padding: .9rem 2rem;
            border-radius: 999px;
            font-weight: 700;
            font-size: 1rem;
            transition: transform .25s, box-shadow .25s, background .25s;
        }

        .btn-white {
            background: #fff;
            color: var(--primary-dark);
            box-shadow: 0 12px 25px -10px rgba(0, 0, 0, .25);
        }

        .btn-white:hover {
            background: #f8fafc;
            transform: translateY(-3px);
            box-shadow: 0 18px 35px -12px rgba(0, 0, 0, .3);
        }

        .btn-ghost-white {
            border: 1px solid rgba(255, 255, 255, .6);
            color: #fff;
            background: rgba(255, 255, 255, .08);
            backdrop-filter: blur(4px);
        }

        .btn-ghost-white:hover {
            background: rgba(255, 255, 255, .18);
            transform: translateY(-3px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            margin-top: var(--space);
            padding: 3.5rem 0 0;
            border-top: 2px solid rgba(37, 99, 235, .3);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            padding-bottom: 2.5rem;
        }

        .footer-brand .site-logo {
            color: #fff;
            margin-bottom: 1rem;
        }

        .footer-brand .site-logo em {
            color: #60a5fa;
        }

        .footer-brand p {
            font-size: .95rem;
            line-height: 1.7;
            max-width: 360px;
        }

        .footer-title {
            font-size: 1.05rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1.2rem;
        }

        .footer-links {
            display: flex;
            flex-direction: column;
            gap: .65rem;
        }

        .footer-links a {
            font-size: .95rem;
            transition: color .2s, padding-left .2s;
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: .25rem;
        }

        .footer-bottom {
            border-top: 1px solid rgba(148, 163, 184, .2);
            padding: 1.6rem 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: .75rem;
            font-size: .9rem;
        }

        .footer-bottom a {
            color: #60a5fa;
            transition: color .2s;
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            :root {
                --space: 4rem;
            }

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

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

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

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

        @media (max-width: 768px) {
            .navbar {
                min-height: 64px;
            }

            .nav-menu {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                gap: .25rem;
                align-items: stretch;
                padding: 1rem 1.5rem 1.5rem;
                box-shadow: 0 20px 30px -12px rgba(2, 12, 27, .2);
                border-bottom: 1px solid var(--border);
                transform: translateY(-120%);
                transition: transform .35s ease;
                z-index: 40;
            }

            .nav-menu.open {
                transform: translateY(0);
            }

            .nav-menu a {
                justify-content: center;
                border-radius: 12px;
                font-size: 1.05rem;
                padding: .85rem;
            }

            .nav-cta {
                display: none;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .category-banner {
                min-height: 320px;
                padding: 4rem 0 3rem;
            }

            .category-switch {
                grid-template-columns: 1fr;
            }

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

            .steps-wrap {
                grid-template-columns: 1fr;
            }

            .stats-section {
                padding: 2.5rem 1.5rem;
            }

            .stat-num {
                font-size: 2.2rem;
            }

            .wise-item {
                flex-wrap: wrap;
                padding: 1.25rem 1.25rem;
            }

            .wise-link {
                margin-left: auto;
            }

            .cta-panel {
                padding: 3rem 1.5rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }

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

        @media (max-width: 520px) {
            .site-logo span {
                font-size: 1.1rem;
            }

            .logo-icon {
                width: 38px;
                height: 38px;
                font-size: 1rem;
            }

            .category-banner h1 {
                font-size: 2.1rem;
            }

            .banner-badges .badge {
                font-size: .8rem;
            }

            .section-block {
                padding: 3rem 0;
            }

            .feature-card img {
                height: 160px;
            }

            .wise-index {
                width: 38px;
                height: 38px;
                font-size: .9rem;
            }

            .wise-content h4 {
                font-size: 1rem;
            }

            .stat-num {
                font-size: 1.8rem;
            }

            .stat-label {
                font-size: .85rem;
            }

            .faq-item summary {
                padding: 1rem 1.2rem;
                font-size: .95rem;
            }

            .faq-item .faq-answer {
                padding: 0 1.2rem 1.2rem;
                font-size: .9rem;
            }

            .cta-btns .btn-white,
            .cta-btns .btn-ghost-white {
                padding: .8rem 1.5rem;
                font-size: .9rem;
            }
        }

/* roulang page: article */
:root {
  --primary: #162b45;
  --primary-dark: #0e1e30;
  --primary-light: #24456a;
  --accent: #d9a441;
  --accent-dark: #bd8a2c;
  --bg: #f6f7f9;
  --bg-white: #ffffff;
  --bg-dark: #0f1b2e;
  --text: #1e293b;
  --text-weak: #64748b;
  --border: #e6e8ef;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 10px 30px rgba(15, 27, 46, 0.08);
  --shadow-lg: 0 18px 44px rgba(15, 27, 46, 0.14);
  --transition: all 0.3s ease;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { border: none; background: none; cursor: pointer; font: inherit; }
input, textarea { font: inherit; }
.container-main { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Header / Nav ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(230, 232, 239, 0.8);
  box-shadow: 0 4px 20px rgba(15, 27, 46, 0.04);
}
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.site-logo em { font-style: normal; color: var(--accent); }
.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: 0 6px 14px rgba(22, 43, 69, 0.28);
}
.nav-menu { display: flex; align-items: center; gap: 8px; }
.nav-menu a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  transition: var(--transition);
}
.nav-menu a:hover { color: var(--primary); background: rgba(22, 43, 69, 0.06); }
.nav-menu a.active { color: #fff; background: var(--primary); box-shadow: 0 8px 16px rgba(22, 43, 69, 0.22); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #e6b85c);
  color: #162b45;
  font-weight: 600;
  font-size: 0.92rem;
  transition: var(--transition);
  box-shadow: 0 8px 18px rgba(217, 164, 65, 0.35);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(217, 164, 65, 0.45); }
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--bg);
  color: var(--primary);
  font-size: 1.1rem;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.nav-toggle:hover { background: rgba(22, 43, 69, 0.1); }

/* ===== Article Hero ===== */
.article-hero {
  position: relative;
  padding: 64px 0 70px;
  background-size: cover;
  background-position: center;
  color: #fff;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  margin-bottom: 18px;
  color: rgba(255, 255, 255, 0.8);
  flex-wrap: wrap;
}
.breadcrumb a { color: rgba(255, 255, 255, 0.9); transition: var(--transition); }
.breadcrumb a:hover { color: var(--accent); }
.crumb-sep { color: rgba(255, 255, 255, 0.45); }
.article-hero h1 {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.3;
  max-width: 900px;
  letter-spacing: 0.01em;
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 20px;
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.85);
}
.article-meta span { display: inline-flex; align-items: center; gap: 7px; }
.article-meta i { color: var(--accent); }

/* ===== Article Main ===== */
.article-main { padding: 48px 0 60px; }
.article-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 40px; align-items: start; }
.article-content {
  background: #fff;
  border-radius: var(--radius);
  padding: 40px 44px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.article-body { font-size: 16px; line-height: 1.9; }
.article-body > * + * { margin-top: 1.1em; }
.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-top: 1.6em;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
  line-height: 1.35;
}
.article-body h3 {
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 1.4em;
}
.article-body p { color: var(--text); }
.article-body ul, .article-body ol { padding-left: 1.4em; margin: 1.2em 0; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 0.5em; padding-left: 0.2em; }
.article-body img { border-radius: 12px; box-shadow: var(--shadow); margin: 1.6em auto; }
.article-body blockquote {
  background: #faf6ec;
  border-left: 4px solid var(--accent);
  border-radius: 0 12px 12px 0;
  padding: 16px 22px;
  color: var(--text-weak);
}
.article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 4px; }
.article-body a:hover { color: var(--accent-dark); }
.article-body table { width: 100%; border-collapse: collapse; margin: 1.6em 0; font-size: 0.94rem; }
.article-body th, .article-body td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; }
.article-body th { background: var(--bg); font-weight: 600; }

/* ===== Not Found ===== */
.not-found { text-align: center; padding: 60px 20px; }
.not-found-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  border-radius: 20px;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--text-weak);
}
.not-found h2 { font-size: 1.5rem; color: var(--primary); margin-bottom: 8px; }
.not-found p { color: var(--text-weak); margin-bottom: 24px; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-weight: 600;
  background: var(--primary);
  color: #fff;
  transition: var(--transition);
  box-shadow: 0 8px 18px rgba(22, 43, 69, 0.22);
}
.btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: 0 12px 26px rgba(22, 43, 69, 0.3); }

/* ===== Sidebar ===== */
.article-sidebar { position: sticky; top: 96px; display: flex; flex-direction: column; gap: 24px; }
.sidebar-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.sidebar-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  padding-bottom: 14px;
  border-bottom: 2px solid var(--bg);
  margin-bottom: 16px;
}
.sidebar-title i { color: var(--accent); }
.sidebar-list li { border-bottom: 1px dashed var(--border); }
.sidebar-list li:last-child { border-bottom: none; }
.sidebar-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  font-size: 0.93rem;
  line-height: 1.45;
  color: var(--text);
  transition: var(--transition);
}
.sidebar-list a:hover { color: var(--primary); padding-left: 5px; }
.dot { width: 6px; height: 6px; flex-shrink: 0; border-radius: 50%; background: var(--accent); }
.side-links { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.side-links a {
  display: block;
  text-align: center;
  padding: 12px 10px;
  border-radius: 12px;
  background: var(--bg);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.side-links a:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 18px rgba(22, 43, 69, 0.18);
}

/* ===== Section Head ===== */
.section-head { margin-bottom: 36px; }
.section-head.center { text-align: center; }
.section-tag {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  background: rgba(217, 164, 65, 0.14);
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.section-head h2 { font-size: 1.85rem; font-weight: 800; color: var(--primary-dark); line-height: 1.3; }
.section-head p { color: var(--text-weak); margin-top: 8px; max-width: 640px; }
.section-head.center p { margin-left: auto; margin-right: auto; }

/* ===== Related ===== */
.related-section { padding: 60px 0; background: var(--bg); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: block;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(15, 27, 46, 0.04);
}
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(217, 164, 65, 0.5); }
.related-thumb { position: relative; aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg); }
.related-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.45s ease; }
.related-card:hover .related-thumb img { transform: scale(1.06); }
.card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  background: rgba(15, 27, 46, 0.78);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  backdrop-filter: blur(6px);
}
.card-badge.accent { background: rgba(217, 164, 65, 0.92); color: var(--primary-dark); }
.related-body { padding: 20px 22px 22px; }
.related-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-dark);
  line-height: 1.45;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-body p {
  font-size: 0.9rem;
  color: var(--text-weak);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.6em;
}
.related-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary);
  margin-top: 12px;
  transition: var(--transition);
}
.related-more i { font-size: 0.8rem; }
.related-card:hover .related-more { color: var(--accent-dark); gap: 10px; }
.empty-tip {
  text-align: center;
  padding: 30px;
  background: #fff;
  border-radius: var(--radius);
  color: var(--text-weak);
}

/* ===== Category ===== */
.category-section { padding: 70px 0; background: #fff; }
.category-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.category-card {
  display: flex;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow);
}
.category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.category-img { width: 42%; flex-shrink: 0; overflow: hidden; position: relative; }
.category-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.category-card:hover .category-img img { transform: scale(1.06); }
.category-body { padding: 28px; display: flex; flex-direction: column; align-items: flex-start; }
.category-body .card-badge { position: static; margin-bottom: 12px; }
.category-body h3 { font-size: 1.25rem; font-weight: 800; color: var(--primary-dark); margin-bottom: 10px; }
.category-body p { font-size: 0.95rem; color: var(--text-weak); margin-bottom: 18px; line-height: 1.7; }
.category-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--primary);
  transition: var(--transition);
  font-size: 0.95rem;
}
.category-link i { font-size: 0.82rem; }
.category-card:hover .category-link { color: var(--accent-dark); gap: 12px; }

/* ===== FAQ ===== */
.faq-section { padding: 70px 0; background: var(--bg); }
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 36px; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  transition: var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-lg); border-color: rgba(217, 164, 65, 0.5); transform: translateY(-3px); }
.faq-item h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 10px;
  line-height: 1.5;
}
.faq-item h3 i { color: var(--accent); }
.faq-item p { font-size: 0.92rem; color: var(--text-weak); line-height: 1.75; }

/* ===== CTA ===== */
.cta-section {
  padding: 72px 0;
  background-size: cover;
  background-position: center;
  color: #fff;
  text-align: center;
}
.cta-section h2 { font-size: 2rem; font-weight: 800; margin-bottom: 14px; text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2); }
.cta-section p { font-size: 1.05rem; color: rgba(255, 255, 255, 0.85); margin-bottom: 30px; max-width: 620px; margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.btn-light {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1.02rem;
  background: var(--accent);
  color: var(--primary-dark);
  transition: var(--transition);
  box-shadow: 0 10px 24px rgba(217, 164, 65, 0.4);
}
.btn-light:hover { transform: translateY(-3px); box-shadow: 0 16px 32px rgba(217, 164, 65, 0.5); background: #e6b85c; }

/* ===== Footer ===== */
.site-footer { background: var(--bg-dark); color: rgba(255, 255, 255, 0.82); padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 40px; padding-bottom: 44px; }
.footer-brand .site-logo { color: #fff; }
.footer-brand .logo-icon { background: linear-gradient(135deg, var(--accent), #e6b85c); color: var(--primary-dark); }
.footer-brand p { font-size: 0.92rem; line-height: 1.8; color: rgba(255, 255, 255, 0.65); margin-top: 16px; max-width: 340px; }
.footer-title { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 18px; letter-spacing: 0.02em; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { color: rgba(255, 255, 255, 0.65); font-size: 0.92rem; transition: var(--transition); }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom a { color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .article-wrap { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .navbar { height: 64px; }
  .site-logo { font-size: 1.05rem; }
  .nav-menu {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    padding: 14px 20px;
    align-items: stretch;
    gap: 4px;
    display: none;
    box-shadow: 0 20px 40px rgba(15, 27, 46, 0.12);
    border-bottom: 1px solid var(--border);
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { text-align: center; }
  .nav-toggle { display: flex; }
  .nav-cta i { margin: 0; }
  .article-hero { padding: 52px 0 56px; }
  .article-hero h1 { font-size: 1.55rem; }
  .article-content { padding: 24px 20px; }
  .related-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr; }
  .category-card { flex-direction: column; }
  .category-img { width: 100%; aspect-ratio: 16 / 9; }
  .faq-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .container-main { padding: 0 16px; }
  .site-logo { font-size: 0.95rem; }
  .logo-icon { width: 32px; height: 32px; }
  .article-meta { gap: 12px; font-size: 0.85rem; }
  .section-head h2 { font-size: 1.45rem; }
  .cta-section h2 { font-size: 1.5rem; }
  .category-body { padding: 20px; }
}

/* roulang page: category2 */
:root {
            --brand-primary: #0e63f3;
            --brand-primary-dark: #0a4dc4;
            --brand-accent: #17c3b2;
            --brand-accent-2: #f5a623;
            --dark-bg: #0a1b32;
            --dark-bg-2: #0e2845;
            --text-main: #132238;
            --text-muted: #5b6b83;
            --bg-white: #ffffff;
            --bg-light: #f3f6fc;
            --border-light: #e3e9f2;
            --radius-lg: 18px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 4px 14px rgba(13, 43, 89, 0.06);
            --shadow-md: 0 12px 30px rgba(13, 43, 89, 0.10);
            --font-main: "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Arial, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-main);
            color: var(--text-main);
            background: var(--bg-white);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        button {
            font-family: inherit;
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
            padding: 0;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 3px solid rgba(14, 99, 243, 0.35);
            outline-offset: 2px;
        }

        .container-main {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
        }

        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
            gap: 24px;
        }

        .site-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
            white-space: nowrap;
        }

        .site-logo .logo-icon {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
            color: #fff;
            font-size: 18px;
            box-shadow: 0 6px 16px rgba(14, 99, 243, 0.24);
        }

        .site-logo em {
            font-style: normal;
            color: var(--brand-primary);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 34px;
        }

        .nav-menu a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
            padding: 8px 0;
            position: relative;
            transition: color 0.25s ease;
        }

        .nav-menu a::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 2px;
            width: 0;
            height: 2px;
            background: var(--brand-primary);
            border-radius: 2px;
            transition: width 0.25s ease;
        }

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

        .nav-menu a.active {
            color: var(--brand-primary);
        }

        .nav-menu a.active::after {
            width: 100%;
        }

        .nav-tools {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--brand-primary), #2b7dff);
            color: #fff;
            font-weight: 600;
            padding: 10px 20px;
            border-radius: 999px;
            font-size: 14px;
            transition: all 0.25s ease;
            box-shadow: 0 8px 20px rgba(14, 99, 243, 0.25);
        }

        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(14, 99, 243, 0.35);
        }

        .nav-cta:active {
            transform: translateY(-1px) scale(0.98);
        }

        .nav-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-light);
            width: 42px;
            height: 42px;
            border-radius: 10px;
            font-size: 18px;
            color: var(--text-main);
            align-items: center;
            justify-content: center;
            transition: all 0.25s ease;
        }

        .nav-toggle:hover {
            border-color: var(--brand-primary);
            color: var(--brand-primary);
        }

        /* ===== Hero ===== */
        .hero-area {
            position: relative;
            background:
                linear-gradient(135deg, rgba(10, 27, 50, 0.94), rgba(14, 40, 69, 0.80)),
                url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            color: #fff;
            padding: 110px 0;
            overflow: hidden;
        }

        .hero-area::before {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 80% 20%, rgba(23, 195, 178, 0.16), transparent 42%);
        }

        .hero-content {
            position: relative;
            max-width: 780px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.18);
            padding: 8px 16px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            backdrop-filter: blur(6px);
            margin-bottom: 22px;
        }

        .hero-title {
            font-size: 44px;
            line-height: 1.18;
            font-weight: 800;
            margin-bottom: 20px;
            letter-spacing: 1px;
        }

        .hero-title span {
            color: #6fd4ff;
        }

        .hero-desc {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.82);
            max-width: 640px;
            margin-bottom: 32px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 36px;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: #ffffff;
            color: var(--brand-primary-dark);
            padding: 13px 28px;
            border-radius: 999px;
            font-weight: 700;
            font-size: 15px;
            box-shadow: 0 10px 24px rgba(255, 255, 255, 0.16);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 14px 30px rgba(255, 255, 255, 0.22);
        }

        .btn-primary:active {
            transform: translateY(-1px) scale(0.98);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            border: 1px solid rgba(255, 255, 255, 0.4);
            color: #ffffff;
            padding: 13px 28px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 15px;
            backdrop-filter: blur(4px);
            transition: all 0.3s ease;
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #ffffff;
        }

        .btn-ghost:active {
            transform: translateY(-1px) scale(0.98);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.16);
            padding-top: 24px;
        }

        .hero-stat strong {
            display: block;
            font-size: 28px;
            font-weight: 800;
            color: #ffffff;
        }

        .hero-stat span {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.65);
        }

        /* ===== Section ===== */
        .section {
            padding: 96px 0;
        }

        .section-light {
            background: var(--bg-light);
        }

        .section-head {
            max-width: 720px;
            margin: 0 auto 48px;
            text-align: center;
        }

        .section-head-left {
            max-width: 720px;
            margin: 0 0 28px;
            text-align: left;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--brand-primary);
            background: rgba(14, 99, 243, 0.08);
            border: 1px solid rgba(14, 99, 243, 0.12);
            border-radius: 999px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 14px;
        }

        .section-desc {
            color: var(--text-muted);
            font-size: 16px;
            line-height: 1.7;
        }

        #process,
        #security,
        #faq {
            scroll-margin-top: 90px;
        }

        /* ===== Process ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .process-card {
            position: relative;
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 32px 26px;
            transition: all 0.3s ease;
            overflow: hidden;
        }

        .process-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--brand-primary), var(--brand-accent));
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .process-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: #cfe0ff;
        }

        .process-card:hover::before {
            opacity: 1;
        }

        .process-card:active {
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        .process-num {
            font-size: 36px;
            font-weight: 800;
            background-image: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1.2;
            margin-bottom: 16px;
        }

        .process-card h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .process-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== Guard Cards ===== */
        .guard-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .guard-card {
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 30px;
            transition: all 0.3s ease;
        }

        .guard-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: #d5e3ff;
        }

        .guard-card:active {
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        .guard-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: #ffffff;
            background: linear-gradient(135deg, var(--brand-primary), #2b7dff);
            margin-bottom: 18px;
        }

        .guard-card:nth-child(2n) .guard-icon {
            background: linear-gradient(135deg, var(--brand-accent), #1f9d8f);
        }

        .guard-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .guard-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== Issue ===== */
        .issue-box {
            display: grid;
            grid-template-columns: 1fr 1.1fr;
            gap: 48px;
            align-items: center;
        }

        .issue-image,
        .tip-image {
            border-radius: 20px;
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .issue-image img,
        .tip-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .issue-list {
            display: grid;
            gap: 14px;
        }

        .issue-item {
            display: flex;
            align-items: center;
            gap: 16px;
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 16px 18px;
            transition: all 0.3s ease;
        }

        .issue-item:hover {
            border-color: var(--brand-primary);
            box-shadow: var(--shadow-sm);
            transform: translateX(4px);
        }

        .issue-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: rgba(14, 99, 243, 0.10);
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }

        .issue-info h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 2px;
        }

        .issue-info p {
            font-size: 13px;
            color: var(--text-muted);
        }

        .issue-item .arrow {
            margin-left: auto;
            color: var(--brand-primary);
            transition: transform 0.3s ease;
        }

        .issue-item:hover .arrow {
            transform: translateX(4px);
        }

        /* ===== Tips ===== */
        .tip-box {
            display: grid;
            grid-template-columns: 1.05fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .tip-list {
            display: grid;
            gap: 14px;
        }

        .tip-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: 12px;
            padding: 16px 18px;
            transition: all 0.3s ease;
        }

        .tip-item:hover {
            border-color: var(--brand-accent);
            box-shadow: var(--shadow-sm);
        }

        .tip-item i {
            margin-top: 3px;
            color: var(--brand-accent);
            font-size: 18px;
        }

        .tip-item strong {
            display: block;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 3px;
        }

        .tip-item p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 840px;
            margin: 0 auto;
            display: grid;
            gap: 14px;
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-light);
            border-radius: 16px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .faq-item.open {
            box-shadow: var(--shadow-md);
            border-color: #d5e3ff;
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            background: transparent;
            border: none;
            padding: 22px 26px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            text-align: left;
            transition: color 0.25s ease;
        }

        .faq-question:hover {
            color: var(--brand-primary);
        }

        .faq-question i {
            color: var(--brand-primary);
            transition: transform 0.3s ease;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 26px;
            transition: max-height 0.4s ease, padding 0.4s ease;
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.8;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
            padding-bottom: 24px;
        }

        /* ===== CTA ===== */
        .cta-area {
            background: linear-gradient(135deg, #0a4dc4, #0e63f3);
            color: #ffffff;
            border-radius: 28px;
            padding: 56px 50px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-area::after {
            content: "";
            position: absolute;
            right: -80px;
            top: -80px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
        }

        .cta-title {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 12px;
            position: relative;
        }

        .cta-desc {
            color: rgba(255, 255, 255, 0.82);
            max-width: 560px;
            margin: 0 auto 26px;
            position: relative;
        }

        .cta-area .hero-actions {
            position: relative;
            justify-content: center;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0a1b32;
            color: #c6d2e3;
            padding: 60px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 40px;
        }

        .footer-brand .site-logo {
            color: #ffffff;
        }

        .footer-brand p {
            margin-top: 16px;
            font-size: 14px;
            line-height: 1.8;
            color: #8fa2bc;
        }

        .footer-title {
            font-size: 16px;
            font-weight: 700;
            color: #ffffff;
            margin-bottom: 16px;
        }

        .footer-links {
            display: grid;
            gap: 12px;
        }

        .footer-links a {
            color: #b6c4da;
            font-size: 14px;
            transition: color 0.25s ease, padding-left 0.25s ease;
        }

        .footer-links a:hover {
            color: #ffffff;
            padding-left: 6px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.10);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            font-size: 13px;
            color: #7f92aa;
        }

        .footer-bottom a {
            color: #9fb3cc;
        }

        .footer-bottom a:hover {
            color: #ffffff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }

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

            .issue-box,
            .tip-box {
                grid-template-columns: 1fr;
            }

            .issue-image,
            .tip-image {
                width: 100%;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 76px;
                left: 16px;
                right: 16px;
                background: #ffffff;
                border: 1px solid var(--border-light);
                border-radius: 16px;
                box-shadow: var(--shadow-md);
                flex-direction: column;
                gap: 4px;
                padding: 12px;
            }

            .nav-menu.open {
                display: flex;
            }

            .nav-menu a {
                display: block;
                padding: 12px 14px;
                border-radius: 10px;
            }

            .nav-menu a::after {
                display: none;
            }

            .nav-menu a.active {
                background: rgba(14, 99, 243, 0.08);
                color: var(--brand-primary);
            }

            .nav-toggle {
                display: inline-flex;
            }

            .section {
                padding: 64px 0;
            }

            .hero-title {
                font-size: 32px;
            }

            .section-title {
                font-size: 26px;
            }

            .cta-area {
                padding: 40px 28px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }

        @media (max-width: 520px) {
            .container-main {
                padding: 0 16px;
            }

            .navbar {
                height: 64px;
            }

            .site-logo {
                font-size: 17px;
            }

            .site-logo .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 15px;
            }

            .nav-cta {
                padding: 8px 14px;
                font-size: 13px;
            }

            .nav-menu {
                top: 64px;
            }

            .process-grid,
            .guard-grid {
                grid-template-columns: 1fr;
            }

            .hero-area {
                padding: 68px 0;
            }

            .hero-title {
                font-size: 28px;
            }

            .hero-desc {
                font-size: 15px;
            }

            .hero-stats {
                gap: 18px;
            }

            .hero-stat strong {
                font-size: 24px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }

            .cta-area {
                padding: 36px 18px;
            }
        }