/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --primary-dark: #070b14;
            --accent: #f59e0b;
            --accent-hover: #d97706;
            --accent-light: #fef3c7;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-full: 50px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container: 1200px;
            --spacer: 80px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Typography ===== */
        .h1,
        .h2,
        .h3,
        .h4 {
            font-weight: 700;
            line-height: 1.3;
            color: var(--text);
        }
        .h1 {
            font-size: clamp(2.4rem, 5vw, 3.8rem);
            letter-spacing: -0.02em;
        }
        .h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            letter-spacing: -0.01em;
        }
        .h3 {
            font-size: clamp(1.2rem, 2vw, 1.5rem);
        }
        .h4 {
            font-size: 1.15rem;
        }
        .text-center {
            text-align: center;
        }
        .text-light {
            color: var(--text-light);
        }
        .text-white {
            color: var(--text-white);
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 640px;
            margin: 12px auto 0;
            line-height: 1.7;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-accent {
            background: var(--accent);
            color: var(--primary-dark);
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            border-color: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(245, 158, 11, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-outline-dark {
            background: transparent;
            color: var(--text);
            border-color: var(--border);
        }
        .btn-outline-dark:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.1rem;
            border-radius: var(--radius);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }
        .btn:focus-visible {
            outline: 3px solid var(--accent);
            outline-offset: 3px;
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--accent-light);
            color: var(--accent-hover);
        }
        .badge-blue {
            background: #dbeafe;
            color: #1d4ed8;
        }
        .badge-green {
            background: #d1fae5;
            color: #047857;
        }
        .badge-white {
            background: rgba(255, 255, 255, 0.15);
            color: var(--text-white);
        }
        .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.78rem;
            font-weight: 500;
            background: var(--bg-alt);
            color: var(--text-light);
            border: 1px solid var(--border);
        }

        /* ===== Section Spacing ===== */
        .section {
            padding: var(--spacer) 0;
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-header {
            margin-bottom: 48px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 23, 42, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            transition: var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.01em;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .logo:hover {
            opacity: 0.9;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.75);
            font-weight: 500;
            font-size: 0.92rem;
            transition: var(--transition);
        }
        .nav a:hover {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.08);
        }
        .nav a.active {
            color: var(--accent);
            background: rgba(245, 158, 11, 0.12);
        }
        .nav .btn-accent {
            padding: 10px 24px;
            margin-left: 8px;
            color: var(--primary-dark);
            font-weight: 700;
        }
        .nav .btn-accent:hover {
            background: var(--accent-hover);
            transform: none;
            box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            background: none;
            border: none;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-white);
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero ===== */
        .hero {
            padding: 160px 0 100px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, #1a2744 100%);
            position: relative;
            overflow: hidden;
            min-height: 85vh;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 700px;
            height: 700px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content .badge {
            margin-bottom: 20px;
        }
        .hero-content .h1 {
            color: var(--text-white);
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero-content .h1 span {
            color: var(--accent);
        }
        .hero-content p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 520px;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius);
            padding: 32px 28px;
            backdrop-filter: blur(10px);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .hero-stat .label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-top: 4px;
        }
        .hero-stat+.hero-stat {
            border-left: 1px solid rgba(255, 255, 255, 0.08);
            padding-left: 20px;
        }

        /* ===== Features ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 36px 28px;
            border: 1px solid var(--border);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
            border-color: var(--accent);
        }
        .feature-card .icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--accent);
            background: var(--accent-light);
            margin-bottom: 20px;
        }
        .feature-card .h3 {
            margin-bottom: 12px;
        }
        .feature-card p {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* ===== Categories ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .category-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 32px 24px;
            border: 1px solid var(--border);
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .category-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow);
            border-color: var(--accent);
        }
        .category-card .icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent);
            background: var(--accent-light);
            margin: 0 auto 16px;
        }
        .category-card .h4 {
            margin-bottom: 8px;
        }
        .category-card .tag {
            margin-top: 12px;
        }
        .category-card .badge {
            margin-top: 12px;
        }

        /* ===== Latest Posts (CMS) ===== */
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .post-card {
            background: var(--bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
            border-color: var(--accent);
        }
        .post-card-body {
            padding: 24px 24px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .post-card .post-meta .badge {
            font-size: 0.7rem;
            padding: 2px 10px;
        }
        .post-card .h4 {
            margin-bottom: 10px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .h4 a:hover {
            color: var(--accent);
        }
        .post-card p {
            color: var(--text-light);
            font-size: 0.92rem;
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .post-card .post-footer {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 24px 18px;
            border-top: 1px solid var(--border-light);
            font-size: 0.82rem;
            color: var(--text-light);
        }
        .post-card .post-footer a {
            color: var(--accent);
            font-weight: 600;
        }
        .post-card .post-footer a:hover {
            color: var(--accent-hover);
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-light);
            background: var(--bg-alt);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }
        .posts-empty i {
            font-size: 2.4rem;
            color: var(--border);
            margin-bottom: 16px;
        }

        /* ===== Stats / Data ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius);
            padding: 36px 24px;
            text-align: center;
            transition: var(--transition);
        }
        .stat-card:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-4px);
        }
        .stat-card .num {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 6px;
        }
        .stat-card .desc {
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
            margin-top: 10px;
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 32px 24px;
            border: 1px solid var(--border);
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: var(--primary-dark);
            font-weight: 800;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        .step-card .h4 {
            margin-bottom: 10px;
        }
        .step-card p {
            color: var(--text-light);
            font-size: 0.92rem;
            line-height: 1.6;
        }
        .step-connector {
            display: none;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            gap: 16px;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text);
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--text-light);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: 50%;
            transform: translateX(-50%);
            width: 800px;
            height: 800px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }
        .cta-section .h2 {
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }
        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .logo {
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            max-width: 320px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer h4 {
            color: var(--text-white);
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.5);
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero .container {
                grid-template-columns: 1fr;
                gap: 40px;
                text-align: center;
            }
            .hero-content p {
                margin: 0 auto 32px;
            }
            .hero-actions {
                justify-content: center;
            }
            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacer: 50px;
            }
            .nav {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: rgba(15, 23, 42, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px 28px;
                gap: 6px;
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                box-shadow: var(--shadow-lg);
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
            }
            .nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav .btn-accent {
                width: 100%;
                justify-content: center;
                margin-left: 0;
                margin-top: 8px;
            }
            .nav-toggle {
                display: flex;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .categories-grid {
                grid-template-columns: 1fr 1fr;
            }
            .posts-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-stats {
                grid-template-columns: repeat(3, 1fr);
                padding: 20px 16px;
            }
            .hero-stat .num {
                font-size: 1.5rem;
            }
            .hero {
                padding: 130px 0 60px;
                min-height: auto;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section {
                padding: 50px 0;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .categories-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .hero-stats {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .hero-stat+.hero-stat {
                border-left: none;
                padding-left: 0;
                border-top: 1px solid rgba(255, 255, 255, 0.08);
                padding-top: 12px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                justify-content: center;
            }
            .cta-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .cta-actions .btn {
                justify-content: center;
            }
            .section-header {
                margin-bottom: 28px;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .post-card-body {
                padding: 18px 18px 14px;
            }
            .post-card .post-footer {
                padding: 12px 18px 14px;
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0a7cff;
            --primary-dark: #005fcc;
            --primary-light: #e8f0fe;
            --accent: #ff6a00;
            --accent-dark: #e05d00;
            --accent-light: #fff3e6;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0b1a2e;
            --bg-card: #ffffff;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #8a9aaa;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f0f4f8;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.08);
            --shadow-xl: 0 32px 64px rgba(0, 0, 0, 0.10);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font-family);
            color: var(--text-primary);
            background: var(--bg-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 600;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.5rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.375rem;
        }
        h4 {
            font-size: 1.125rem;
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        p:last-child {
            margin-bottom: 0;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 16px;
            font-size: 2rem;
        }
        .section-sub {
            text-align: center;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 48px auto;
            font-size: 1.0625rem;
        }
        .text-center {
            text-align: center;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-12 {
            gap: 12px;
        }
        .gap-16 {
            gap: 16px;
        }
        .gap-24 {
            gap: 24px;
        }
        .flex {
            display: flex;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .items-center {
            align-items: center;
        }
        .justify-center {
            justify-content: center;
        }
        .justify-between {
            justify-content: space-between;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 24px;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.3px;
        }
        .logo i {
            font-size: 1.6rem;
            color: var(--accent);
        }
        .logo:hover {
            color: var(--primary-dark);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background var(--transition), color var(--transition);
        }
        .nav a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav .btn-accent {
            background: var(--accent);
            color: #fff !important;
            padding: 8px 22px;
            border-radius: 50px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 14px rgba(255, 106, 0, 0.25);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .nav .btn-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(255, 106, 0, 0.35);
            background: var(--accent-dark);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-toggle.open span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.open span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9375rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(10, 124, 255, 0.25);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            box-shadow: 0 8px 28px rgba(10, 124, 255, 0.35);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(255, 106, 0, 0.25);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            box-shadow: 0 8px 28px rgba(255, 106, 0, 0.35);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.875rem;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.0625rem;
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
        }
        .btn-white:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8125rem;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-accent {
            background: var(--accent-light);
            color: var(--accent);
        }
        .badge-success {
            background: #e6f7e6;
            color: #0a8a0a;
        }
        .badge-sm {
            padding: 2px 10px;
            font-size: 0.75rem;
        }

        /* ===== Card ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            padding: 28px 24px;
            transition: all var(--transition);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--primary);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            background: var(--primary-light);
            color: var(--primary);
            margin-bottom: 16px;
        }
        .card-icon.accent {
            background: var(--accent-light);
            color: var(--accent);
        }
        .card h3 {
            margin-bottom: 10px;
            font-size: 1.125rem;
        }
        .card p {
            font-size: 0.9375rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== Hero (分类页轻量首屏) ===== */
        .page-hero {
            background: linear-gradient(135deg, #0b1a2e 0%, #1a2f4a 50%, #0f2840 100%);
            padding: 72px 0 64px;
            position: relative;
            overflow: hidden;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 20% 50%, rgba(10, 124, 255, 0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 30%, rgba(255, 106, 0, 0.08) 0%, transparent 50%);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .page-hero h1 {
            color: #fff;
            font-size: 2.6rem;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .page-hero h1 i {
            color: var(--accent);
            margin-right: 12px;
        }
        .page-hero p {
            color: rgba(255, 255, 255, 0.75);
            font-size: 1.125rem;
            max-width: 680px;
            margin: 0 auto 28px auto;
        }
        .page-hero .hero-badges {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-bottom: 20px;
        }
        .page-hero .hero-badges .badge {
            background: rgba(255, 255, 255, 0.10);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(4px);
        }
        .page-hero .hero-badges .badge i {
            color: var(--accent);
        }

        /* ===== 登录方式板块 ===== */
        .login-methods .card {
            text-align: center;
            padding: 32px 20px;
        }
        .login-methods .card .card-icon {
            margin: 0 auto 16px auto;
        }
        .login-methods .card .badge {
            margin-top: 14px;
        }

        /* ===== 流程步骤 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 28px 20px;
            text-align: center;
            position: relative;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--primary);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 0.875rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(10, 124, 255, 0.30);
        }
        .step-item .step-icon {
            font-size: 2rem;
            color: var(--primary);
            margin: 8px 0 12px 0;
        }
        .step-item h4 {
            font-size: 1.0625rem;
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== 安全提示 ===== */
        .safety-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .safety-card {
            display: flex;
            gap: 18px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            padding: 24px 20px;
            transition: all var(--transition);
            align-items: flex-start;
        }
        .safety-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
            transform: translateY(-2px);
        }
        .safety-card .safety-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            background: var(--accent-light);
            color: var(--accent);
        }
        .safety-card h4 {
            font-size: 1.0625rem;
            margin-bottom: 6px;
        }
        .safety-card p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            gap: 16px;
            border: none;
        }
        .faq-question i {
            transition: transform var(--transition);
            color: var(--primary);
            font-size: 1.125rem;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.9375rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px 24px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, #005fcc 100%);
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 60%, rgba(255, 255, 255, 0.08) 0%, transparent 60%);
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            color: #fff;
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.80);
            max-width: 560px;
            margin: 0 auto 32px auto;
            font-size: 1.0625rem;
        }
        .cta-section .btn-white:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 32px;
        }
        .footer .logo {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer .logo i {
            color: var(--accent);
        }
        .footer p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.875rem;
            max-width: 340px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.875rem;
            transition: color var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8125rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .section-sub {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 20px 24px;
                gap: 8px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s ease;
                pointer-events: none;
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav .btn-accent {
                justify-content: center;
                margin-top: 8px;
            }
            .nav-toggle {
                display: flex;
            }
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .page-hero p {
                font-size: 0.95rem;
            }
            .page-hero {
                padding: 48px 0 40px;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .safety-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .login-methods .card {
                padding: 24px 16px;
            }
            .card {
                padding: 20px 16px;
            }
            .step-item {
                padding: 24px 16px;
            }
            .safety-card {
                padding: 18px 16px;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.9375rem;
            }
            .faq-answer {
                font-size: 0.875rem;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 0.95rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .section {
                padding: 40px 0;
            }
            .page-hero h1 {
                font-size: 1.5rem;
            }
            .page-hero h1 i {
                margin-right: 6px;
            }
            .page-hero .hero-badges .badge {
                font-size: 0.75rem;
                padding: 3px 10px;
            }
            .logo {
                font-size: 1.1rem;
            }
            .logo i {
                font-size: 1.3rem;
            }
            .card-icon {
                width: 44px;
                height: 44px;
                font-size: 1.2rem;
            }
            .step-item .step-icon {
                font-size: 1.6rem;
            }
            .footer {
                padding: 40px 0 24px;
            }
            .cta-section {
                padding: 48px 0;
            }
            .safety-card .safety-icon {
                width: 40px;
                height: 40px;
                font-size: 1.1rem;
            }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0a1628;
            --primary-light: #1a2a4a;
            --accent: #f0b429;
            --accent-hover: #d4a020;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f1a2e;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(10, 22, 40, 0.08);
            --shadow-lg: 0 12px 40px rgba(10, 22, 40, 0.14);
            --shadow-accent: 0 4px 20px rgba(240, 180, 41, 0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent); }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--primary); }

        /* ===== 容器 ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== 导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(10, 22, 40, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            height: var(--header-h);
            transition: background var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.02em;
        }
        .logo i { color: var(--accent); font-size: 1.5rem; }
        .logo:hover { color: var(--accent); }
        .nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav a {
            font-size: 0.95rem;
            font-weight: 500;
            color: rgba(255,255,255,0.75);
            padding: 6px 0;
            position: relative;
            transition: color var(--transition);
        }
        .nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--accent);
            transform: scaleX(0);
            transform-origin: center;
            transition: transform var(--transition);
            border-radius: 2px;
        }
        .nav a:hover { color: var(--text-white); }
        .nav a:hover::after { transform: scaleX(1); }
        .nav a.active { color: var(--accent); }
        .nav a.active::after { transform: scaleX(1); background: var(--accent); }
        .nav .btn {
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            transition: all var(--transition);
            letter-spacing: 0.01em;
        }
        .nav .btn-accent {
            background: var(--accent);
            color: var(--primary) !important;
            box-shadow: var(--shadow-accent);
        }
        .nav .btn-accent:hover {
            background: var(--accent-hover);
            transform: translateY(-1px);
            box-shadow: 0 8px 28px rgba(240, 180, 41, 0.35);
            color: var(--primary) !important;
        }
        .nav .btn-accent i { margin-right: 6px; }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 4px;
            background: transparent;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            border-radius: 4px;
            background: var(--text-white);
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        @media (max-width: 768px) {
            .nav-toggle { display: flex; }
            .nav {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(10, 22, 40, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 24px 32px 32px;
                gap: 20px;
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                border-bottom: 1px solid rgba(255,255,255,0.06);
            }
            .nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
            .nav a { font-size: 1.05rem; padding: 8px 0; }
            .nav .btn { width: 100%; text-align: center; margin-top: 8px; }
        }

        /* ===== 文章页 Hero ===== */
        .article-hero {
            padding: 120px 0 40px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            position: relative;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(240,180,41,0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .article-hero::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .breadcrumb a { color: rgba(255,255,255,0.6); }
        .breadcrumb a:hover { color: var(--accent); }
        .breadcrumb span { color: rgba(255,255,255,0.3); }
        .breadcrumb .current { color: var(--accent); }
        .article-hero .category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(240,180,41,0.15);
            color: var(--accent);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 16px;
            border: 1px solid rgba(240,180,41,0.2);
        }
        .article-hero h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.25;
            max-width: 900px;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 24px;
            flex-wrap: wrap;
            color: rgba(255,255,255,0.55);
            font-size: 0.9rem;
        }
        .article-meta i { margin-right: 6px; color: var(--accent); opacity: 0.7; }
        .article-meta span { display: flex; align-items: center; }
        @media (max-width: 768px) {
            .article-hero { padding: 100px 0 28px; }
            .article-hero h1 { font-size: 1.6rem; }
            .article-meta { gap: 12px; font-size: 0.82rem; }
        }
        @media (max-width: 520px) {
            .article-hero h1 { font-size: 1.35rem; }
            .article-meta { flex-direction: column; align-items: flex-start; gap: 8px; }
        }

        /* ===== 文章正文区 ===== */
        .article-main {
            padding: 48px 0 60px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        @media (max-width: 992px) {
            .article-layout { grid-template-columns: 1fr; gap: 40px; }
        }
        .article-content {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 48px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .article-content .content-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-content .content-body h2 {
            font-size: 1.6rem;
            margin-top: 40px;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .article-content .content-body h3 {
            font-size: 1.25rem;
            margin-top: 32px;
            margin-bottom: 12px;
            color: var(--primary);
        }
        .article-content .content-body p {
            margin-bottom: 20px;
        }
        .article-content .content-body ul, .article-content .content-body ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-content .content-body ul li {
            list-style: disc;
            margin-bottom: 8px;
        }
        .article-content .content-body ol li {
            list-style: decimal;
            margin-bottom: 8px;
        }
        .article-content .content-body a {
            color: var(--accent-hover);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content .content-body a:hover { color: var(--accent); }
        .article-content .content-body blockquote {
            border-left: 4px solid var(--accent);
            padding: 16px 24px;
            margin: 24px 0;
            background: var(--accent-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--primary);
            font-style: italic;
        }
        .article-content .content-body img {
            border-radius: var(--radius);
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-content .content-body code {
            background: #f1f5f9;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--primary);
        }
        .article-content .content-body pre {
            background: var(--primary);
            color: #e2e8f0;
            padding: 24px;
            border-radius: var(--radius);
            overflow-x: auto;
            margin: 24px 0;
        }
        @media (max-width: 768px) {
            .article-content { padding: 28px 20px; }
            .article-content .content-body { font-size: 0.98rem; }
            .article-content .content-body h2 { font-size: 1.3rem; }
        }

        /* ===== 文章底部 ===== */
        .article-footer-bar {
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .article-tags .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--bg);
            color: var(--text-light);
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.82rem;
            font-weight: 500;
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            border-color: var(--accent);
            color: var(--accent-hover);
            background: var(--accent-light);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .article-share span { font-size: 0.85rem; color: var(--text-light); font-weight: 500; }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg);
            border: 1px solid var(--border);
            color: var(--text-light);
            transition: all var(--transition);
            font-size: 0.9rem;
        }
        .article-share a:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(240,180,41,0.3);
        }

        /* ===== 侧边栏 ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .sidebar-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 18px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--accent);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h3 i { color: var(--accent); }
        .sidebar-list { display: flex; flex-direction: column; gap: 12px; }
        .sidebar-list li { }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            font-size: 0.9rem;
            line-height: 1.4;
        }
        .sidebar-list a:hover {
            background: var(--bg);
            transform: translateX(4px);
        }
        .sidebar-list a .num {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--accent-light);
            color: var(--accent-hover);
            border-radius: 50%;
            font-size: 0.75rem;
            font-weight: 700;
        }
        .sidebar-list a .text { flex: 1; color: var(--text); }
        .sidebar-list a:hover .text { color: var(--accent-hover); }
        .sidebar-list a .date {
            font-size: 0.75rem;
            color: var(--text-light);
            flex-shrink: 0;
        }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid rgba(255,255,255,0.06);
        }
        .sidebar-cta h4 { color: var(--text-white); font-size: 1.1rem; margin-bottom: 12px; }
        .sidebar-cta p { color: rgba(255,255,255,0.6); font-size: 0.9rem; margin-bottom: 20px; }
        .sidebar-cta .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
        }
        .sidebar-cta .btn-accent {
            background: var(--accent);
            color: var(--primary);
            box-shadow: var(--shadow-accent);
        }
        .sidebar-cta .btn-accent:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(240,180,41,0.35);
        }
        @media (max-width: 992px) {
            .article-sidebar { flex-direction: row; flex-wrap: wrap; }
            .sidebar-card { flex: 1; min-width: 260px; }
        }

        /* ===== 相关文章 ===== */
        .related-section {
            padding: 60px 0 80px;
            background: var(--bg);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 8px;
            color: var(--primary);
        }
        .related-section .section-sub {
            text-align: center;
            color: var(--text-light);
            font-size: 1rem;
            margin-bottom: 40px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(240,180,41,0.2);
        }
        .related-card .cat {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--accent-hover);
            text-transform: uppercase;
            letter-spacing: 0.04em;
            margin-bottom: 8px;
        }
        .related-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .related-card h4 a { color: var(--primary); }
        .related-card h4 a:hover { color: var(--accent-hover); }
        .related-card p {
            font-size: 0.88rem;
            color: var(--text-light);
            line-height: 1.6;
            margin-bottom: 16px;
            flex: 1;
        }
        .related-card .meta {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .related-card .meta i { margin-right: 4px; opacity: 0.7; }
        @media (max-width: 992px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 620px) {
            .related-grid { grid-template-columns: 1fr; }
            .related-section .section-title { font-size: 1.4rem; }
        }

        /* ===== CTA ===== */
        .article-cta {
            padding: 60px 0;
            background: linear-gradient(135deg, var(--primary) 0%, #0d1f38 100%);
            position: relative;
            overflow: hidden;
        }
        .article-cta::before {
            content: '';
            position: absolute;
            top: -40%;
            left: 30%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(240,180,41,0.05) 0%, transparent 70%);
            border-radius: 50%;
        }
        .article-cta .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .article-cta h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .article-cta p {
            font-size: 1.05rem;
            color: rgba(255,255,255,0.65);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .article-cta .btn-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .article-cta .btn {
            padding: 14px 36px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .article-cta .btn-accent {
            background: var(--accent);
            color: var(--primary);
            box-shadow: var(--shadow-accent);
        }
        .article-cta .btn-accent:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 10px 35px rgba(240,180,41,0.35);
        }
        .article-cta .btn-outline {
            background: transparent;
            color: var(--text-white);
            border: 2px solid rgba(255,255,255,0.2);
        }
        .article-cta .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(240,180,41,0.08);
        }
        @media (max-width: 768px) {
            .article-cta h2 { font-size: 1.4rem; }
            .article-cta .btn { width: 100%; justify-content: center; }
        }

        /* ===== 内容未找到 ===== */
        .not-found-box {
            text-align: center;
            padding: 60px 20px;
        }
        .not-found-box i {
            font-size: 4rem;
            color: var(--accent);
            margin-bottom: 20px;
            opacity: 0.6;
        }
        .not-found-box h2 {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-light);
            font-size: 1.05rem;
            margin-bottom: 24px;
        }
        .not-found-box .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            background: var(--accent);
            color: var(--primary);
            font-weight: 600;
            transition: all var(--transition);
        }
        .not-found-box .btn:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: var(--shadow-accent);
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--primary);
            color: rgba(255,255,255,0.75);
            padding: 60px 0 0;
            margin-top: auto;
            border-top: 1px solid rgba(255,255,255,0.04);
        }
        .footer .logo { margin-bottom: 16px; }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.5); max-width: 360px; }
        .footer h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 18px;
            letter-spacing: 0.02em;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-links a {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.55);
            transition: color var(--transition), transform var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            width: fit-content;
        }
        .footer-links a:hover { color: var(--accent); transform: translateX(4px); }
        .footer-links a i { width: 16px; color: var(--accent); opacity: 0.7; }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom a { color: rgba(255,255,255,0.45); }
        .footer-bottom a:hover { color: var(--accent); }
        @media (max-width: 992px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 620px) {
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== 通用工具 ===== */
        .text-center { text-align: center; }
        .mb-8 { margin-bottom: 8px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .mb-32 { margin-bottom: 32px; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }

        /* ===== 焦点 & 可访问性 ===== */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }
        .nav .btn:focus-visible { outline-color: var(--accent); }