/* roulang page: index */
:root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC2;
            --primary-light: #EBF4FF;
            --accent: #F39C12;
            --accent-dark: #E08E0B;
            --bg-white: #FFFFFF;
            --bg-light: #F8F9FA;
            --text-primary: #1A1A2E;
            --text-secondary: #4A5568;
            --text-muted: #A0AEC0;
            --border-color: #E2E8F0;
            --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-lg: 0 8px 24px rgba(0,0,0,0.10);
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --font-heading: 'Inter', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
            --font-body: 'Inter', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
        }
        * {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-body);
            color: var(--text-primary);
            background: var(--bg-white);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-heading);
            line-height: 1.2;
            margin-top: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        button, input, select, textarea {
            font-family: inherit;
            outline: none;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 72px;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 2px 12px rgba(0,0,0,0.08);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--primary-dark);
            flex-shrink: 0;
        }
        .nav-logo svg {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }
        .nav-logo span {
            white-space: nowrap;
        }
        .nav-center {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-center a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: color 0.2s, border-color 0.2s;
        }
        .nav-center a:hover {
            color: var(--primary);
        }
        .nav-center a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }
        .search-box {
            position: relative;
            display: flex;
            align-items: center;
        }
        .search-box input {
            width: 200px;
            height: 40px;
            padding: 0 16px 0 40px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            background: var(--bg-light);
            font-size: 0.9rem;
            color: var(--text-primary);
            transition: border-color 0.2s, box-shadow 0.2s, width 0.3s;
        }
        .search-box input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(91,155,213,0.15);
            width: 260px;
            background: var(--bg-white);
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .search-box .search-icon {
            position: absolute;
            left: 12px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 0.9rem;
            pointer-events: none;
        }
        .search-box .kbd {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 0.7rem;
            color: var(--text-muted);
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 1px 6px;
            line-height: 1.4;
            pointer-events: none;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            height: 40px;
            padding: 0 20px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.9rem;
            transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
        }
        .nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(91,155,213,0.3);
        }
        .nav-cta:active {
            transform: translateY(0);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            gap: 5px;
            width: 32px;
            height: 32px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 4px;
        }
        .hamburger span {
            display: block;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: 0.3s;
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            width: 100%;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
            z-index: 999;
            padding: 16px 24px;
            flex-direction: column;
            gap: 12px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 8px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .mobile-menu a:last-child {
            border-bottom: none;
        }
        .mobile-menu a.active {
            color: var(--primary);
        }
        @media (max-width: 768px) {
            .nav-center {
                display: none;
            }
            .nav-right .search-box {
                display: none;
            }
            .nav-right .nav-cta {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .nav-right {
                gap: 8px;
            }
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(91,155,213,0.3);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--accent);
            color: #fff;
            border: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(243,156,18,0.3);
        }
        .btn-accent:active {
            transform: translateY(0);
        }
        .btn-accent:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: transparent;
            color: var(--text-primary);
            border: 2px solid var(--border-color);
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, border-color 0.2s, transform 0.2s;
        }
        .btn-outline:hover {
            background: var(--bg-light);
            border-color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: #fff;
            color: var(--primary);
            border: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
        }
        .btn-white:hover {
            background: var(--bg-light);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .btn-white-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.2s, border-color 0.2s, transform 0.2s;
        }
        .btn-white-outline:hover {
            background: rgba(255,255,255,0.15);
            border-color: #fff;
            transform: translateY(-2px);
        }

        /* Hero */
        .hero-section {
            position: relative;
            padding: 120px 0 80px;
            background: linear-gradient(135deg, #FFFFFF 0%, #EBF4FF 100%);
            overflow: hidden;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.06;
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary-dark);
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero-content .subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.6;
            max-width: 540px;
        }
        .hero-btns {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-image {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-image img {
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-lg);
            max-width: 100%;
            height: auto;
            object-fit: cover;
            aspect-ratio: 4/3;
        }
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 40px;
                text-align: center;
            }
            .hero-content .subtitle {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }
            .hero-btns {
                justify-content: center;
            }
            .hero-content h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 640px) {
            .hero-section {
                padding: 100px 0 60px;
            }
            .hero-content h1 {
                font-size: 1.8rem;
            }
            .hero-content .subtitle {
                font-size: 1rem;
            }
            .hero-btns {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-btns .btn-primary,
            .hero-btns .btn-outline {
                justify-content: center;
            }
        }

        /* Section spacing */
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto;
        }
        @media (max-width: 640px) {
            .section-padding {
                padding: 48px 0;
            }
            .section-title h2 {
                font-size: 1.5rem;
            }
        }

        /* Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            position: relative;
        }
        .step-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
            position: relative;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .step-card .step-number {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--primary-light);
            position: absolute;
            top: 8px;
            right: 16px;
            line-height: 1;
            opacity: 0.5;
        }
        .step-card .step-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 16px;
            background: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
        }
        .step-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .step-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }
        .steps-connector {
            display: none;
        }
        @media (min-width: 1024px) {
            .steps-grid {
                position: relative;
            }
            .steps-grid::after {
                content: '';
                position: absolute;
                top: 64px;
                left: calc(16.66% + 16px);
                right: calc(16.66% + 16px);
                height: 2px;
                background: repeating-linear-gradient(90deg, var(--border-color) 0, var(--border-color) 8px, transparent 8px, transparent 16px);
                z-index: 0;
                pointer-events: none;
            }
            .step-card {
                z-index: 1;
            }
        }
        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        /* Cases */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .case-card {
            background: var(--bg-white);
            border-radius: var(--radius-xl);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .case-card .case-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            transition: transform 0.4s;
        }
        .case-card:hover .case-img {
            transform: scale(1.05);
        }
        .case-card .case-body {
            padding: 24px;
        }
        .case-card .case-tag {
            display: inline-block;
            padding: 2px 12px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: var(--radius-sm);
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .case-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .case-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        @media (max-width: 768px) {
            .cases-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        /* FAQ */
        .faq-section {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            margin-bottom: 12px;
            overflow: hidden;
            background: var(--bg-white);
            transition: box-shadow 0.2s;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: background 0.2s;
        }
        .faq-question:hover {
            background: var(--bg-light);
        }
        .faq-question .faq-toggle {
            font-size: 1.2rem;
            color: var(--primary);
            transition: transform 0.3s;
            flex-shrink: 0;
        }
        .faq-item.open .faq-toggle {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 24px 20px;
        }

        /* CTA */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            color: #fff;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            opacity: 0.85;
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-btns {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        @media (max-width: 640px) {
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .cta-btns {
                flex-direction: column;
                align-items: stretch;
            }
            .cta-btns .btn-white,
            .cta-btns .btn-white-outline {
                justify-content: center;
            }
        }

        /* Latest posts (CMS) */
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .post-card {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .post-card .post-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }
        .post-card .post-body {
            padding: 20px;
        }
        .post-card .post-cat {
            display: inline-block;
            padding: 2px 10px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: var(--radius-sm);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .post-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .post-excerpt {
            font-size: 0.88rem;
            color: var(--text-secondary);
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .post-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .post-card .post-meta i {
            font-size: 0.75rem;
        }
        @media (max-width: 1024px) {
            .posts-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .posts-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Footer */
        .site-footer {
            background: #1F2937;
            color: rgba(255,255,255,0.8);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-brand .footer-logo svg {
            width: 28px;
            height: 28px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .footer-col ul li a:hover {
            color: var(--primary-light);
        }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255,255,255,0.7);
            font-size: 1.1rem;
            transition: background 0.2s, color 0.2s;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
        }
        .footer-bottom {
            text-align: center;
            padding: 20px 0;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        /* Background variants */
        .bg-light-alt {
            background: var(--bg-light);
        }

        /* Empty state */
        .empty-state {
            text-align: center;
            padding: 40px 20px;
            color: var(--text-muted);
            font-size: 1rem;
        }
        .empty-state i {
            font-size: 2.5rem;
            margin-bottom: 16px;
            display: block;
            color: var(--border-color);
        }

        /* Badge / tag */
        .badge {
            display: inline-block;
            padding: 2px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.75rem;
            font-weight: 600;
            line-height: 1.6;
        }
        .badge-primary {
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-accent {
            background: #FEF3C7;
            color: #B45309;
        }

        /* Scroll behavior */
        .scroll-fade {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .scroll-fade.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* Focus visible */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

/* roulang page: article */
:root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC2;
            --primary-light: #EBF4FF;
            --accent: #F39C12;
            --accent-dark: #E08E0B;
            --accent-light: #FEF3E2;
            --bg-white: #FFFFFF;
            --bg-light: #F8F9FA;
            --text-primary: #1A1A2E;
            --text-secondary: #4A5568;
            --text-muted: #A0AEC0;
            --border-color: #E2E8F0;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-xs: 4px;
            --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
            --shadow-lg: 0 12px 36px rgba(0,0,0,0.12);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif; color: var(--text-primary); background: var(--bg-white); line-height: 1.75; -webkit-font-smoothing: antialiased; }
        a { color: inherit; text-decoration: none; transition: color 0.2s; }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        @media (max-width: 640px) { .container { padding: 0 16px; } }

        /* header / nav */
        .site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(255,255,255,0.95); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color); height: 72px; }
        .header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
        .logo-wrap { display: flex; align-items: center; gap: 10px; }
        .logo-wrap .logo-icon { width: 36px; height: 36px; flex-shrink: 0; }
        .logo-wrap .logo-text { font-size: 1.35rem; font-weight: 700; color: var(--text-primary); letter-spacing: 0.5px; }
        .nav-center { display: flex; align-items: center; gap: 32px; }
        .nav-center a { font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); padding: 6px 0; border-bottom: 2px solid transparent; transition: all 0.2s; }
        .nav-center a:hover, .nav-center a.active { color: var(--primary); border-bottom-color: var(--primary); }
        .nav-right { display: flex; align-items: center; gap: 16px; }
        .search-wrap { position: relative; }
        .search-wrap input { width: 200px; padding: 8px 16px 8px 38px; border: 1px solid var(--border-color); border-radius: var(--radius-sm); background: var(--bg-light); font-size: 0.9rem; color: var(--text-primary); outline: none; transition: all 0.2s; }
        .search-wrap input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(91,155,213,0.15); width: 240px; }
        .search-wrap .search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 0.9rem; pointer-events: none; }
        .search-wrap .kbd-hint { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); font-size: 0.7rem; color: var(--text-muted); background: var(--bg-white); border: 1px solid var(--border-color); border-radius: 4px; padding: 0 6px; line-height: 1.6; pointer-events: none; }
        .btn-primary { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; background: var(--primary); color: #fff; border: none; border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.25s; }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(91,155,213,0.35); }
        .btn-primary:focus { outline: none; box-shadow: 0 0 0 3px rgba(91,155,213,0.4); }
        .btn-accent { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; background: var(--accent); color: #fff; border: none; border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.25s; }
        .btn-accent:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(243,156,18,0.35); }
        .btn-outline { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.8); border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.25s; }
        .btn-outline:hover { background: rgba(255,255,255,0.15); border-color: #fff; transform: translateY(-2px); }
        .btn-outline-white { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; background: #fff; color: var(--primary); border: none; border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all 0.25s; }
        .btn-outline-white:hover { background: var(--bg-light); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255,255,255,0.3); }
        .hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
        .hamburger span { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all 0.2s; }
        @media (max-width: 768px) {
            .nav-center { display: none; }
            .nav-right .search-wrap { display: none; }
            .hamburger { display: flex; }
            .nav-right .btn-primary { padding: 8px 16px; font-size: 0.85rem; }
            .mobile-nav-open .nav-center { display: flex; flex-direction: column; position: absolute; top: 72px; left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border-color); padding: 20px 24px; gap: 16px; align-items: flex-start; }
            .mobile-nav-open .nav-center a { width: 100%; padding: 8px 0; border-bottom: 1px solid var(--border-color); }
        }
        @media (max-width: 480px) {
            .logo-wrap .logo-text { font-size: 1.1rem; }
            .nav-right .btn-primary { padding: 6px 12px; font-size: 0.8rem; }
        }

        /* breadcrumb */
        .breadcrumb-wrap { padding: 96px 0 20px; background: var(--bg-light); border-bottom: 1px solid var(--border-color); }
        .breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; color: var(--text-secondary); flex-wrap: wrap; }
        .breadcrumb a { color: var(--primary); }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb .sep { color: var(--text-muted); }
        .breadcrumb .current { color: var(--text-primary); font-weight: 500; }

        /* article main */
        .article-section { padding: 48px 0 80px; }
        .article-container { max-width: 800px; margin: 0 auto; }
        .article-header { margin-bottom: 40px; }
        .article-header h1 { font-size: 2.2rem; font-weight: 800; line-height: 1.3; color: var(--text-primary); margin-bottom: 16px; letter-spacing: -0.3px; }
        .article-meta { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; font-size: 0.9rem; color: var(--text-secondary); }
        .article-meta .category-tag { display: inline-block; padding: 4px 14px; background: var(--primary-light); color: var(--primary); border-radius: var(--radius-xs); font-size: 0.8rem; font-weight: 600; }
        .article-meta .date { color: var(--text-muted); }
        .article-meta .sep { color: var(--border-color); }
        .article-body { font-size: 1.05rem; line-height: 1.9; color: var(--text-secondary); }
        .article-body h2 { font-size: 1.6rem; font-weight: 700; color: var(--text-primary); margin: 40px 0 16px; line-height: 1.3; }
        .article-body h3 { font-size: 1.3rem; font-weight: 600; color: var(--text-primary); margin: 32px 0 12px; }
        .article-body p { margin-bottom: 20px; }
        .article-body ul, .article-body ol { margin: 16px 0 20px; padding-left: 24px; }
        .article-body li { margin-bottom: 8px; }
        .article-body blockquote { border-left: 4px solid var(--primary); padding: 12px 20px; margin: 24px 0; background: var(--bg-light); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-secondary); font-style: italic; }
        .article-body img { border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow-card); }
        .article-body a { color: var(--primary); text-decoration: underline; }
        .article-body a:hover { color: var(--primary-dark); }
        .article-body code { background: var(--bg-light); padding: 2px 8px; border-radius: var(--radius-xs); font-size: 0.9em; border: 1px solid var(--border-color); }
        .article-body pre { background: #1F2937; color: #E5E7EB; padding: 20px 24px; border-radius: var(--radius-md); overflow-x: auto; margin: 24px 0; font-size: 0.9rem; line-height: 1.6; }
        .article-body pre code { background: none; border: none; padding: 0; color: inherit; }

        /* not found */
        .not-found-box { text-align: center; padding: 80px 20px; }
        .not-found-box .icon { font-size: 4rem; color: var(--text-muted); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 1.6rem; color: var(--text-primary); margin-bottom: 12px; }
        .not-found-box p { color: var(--text-secondary); margin-bottom: 24px; }
        .not-found-box .btn-primary { display: inline-flex; }

        /* related */
        .related-section { background: var(--bg-light); padding: 60px 0; }
        .related-section h2 { font-size: 1.8rem; font-weight: 700; text-align: center; margin-bottom: 40px; color: var(--text-primary); }
        .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        @media (max-width: 1024px) { .related-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 640px) { .related-grid { grid-template-columns: 1fr; } }
        .related-card { background: #fff; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-card); transition: all 0.3s; }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .related-card img { width: 100%; height: 180px; object-fit: cover; }
        .related-card-body { padding: 16px 20px 20px; }
        .related-card-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .related-card-body p { font-size: 0.85rem; color: var(--text-secondary); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .related-card-body .meta { font-size: 0.8rem; color: var(--text-muted); margin-top: 10px; }

        /* footer */
        .site-footer { background: #1F2937; color: rgba(255,255,255,0.85); padding: 60px 0 0; }
        .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08); }
        .footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
        .footer-logo svg { width: 32px; height: 32px; flex-shrink: 0; }
        .footer-logo span { font-size: 1.2rem; font-weight: 700; color: #fff; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 360px; }
        .footer-col h4 { font-size: 1rem; font-weight: 600; color: #fff; margin-bottom: 16px; }
        .footer-col ul { list-style: none; padding: 0; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: color 0.2s; }
        .footer-col ul li a:hover { color: var(--primary-light); }
        .footer-col ul li a i { margin-right: 8px; width: 16px; text-align: center; }
        .footer-social { display: flex; gap: 16px; margin-top: 8px; }
        .footer-social a { display: flex; align-items: center; justify-content: center; width: 42px; height: 42px; background: rgba(255,255,255,0.08); border-radius: 50%; color: rgba(255,255,255,0.7); font-size: 1.2rem; transition: all 0.25s; }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .footer-bottom { padding: 20px 0; text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.4); }
        @media (max-width: 1024px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
        @media (max-width: 640px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; } }

        /* prose override for article */
        .prose-custom h2, .prose-custom h3, .prose-custom h4 { color: var(--text-primary); }
        .prose-custom p { margin-bottom: 1.2em; }
        .prose-custom img { border-radius: var(--radius-md); margin: 1.5em 0; }

        /* responsive for article */
        @media (max-width: 768px) {
            .article-header h1 { font-size: 1.7rem; }
            .article-body { font-size: 1rem; }
            .article-container { padding: 0 4px; }
        }
        @media (max-width: 480px) {
            .article-header h1 { font-size: 1.4rem; }
            .breadcrumb-wrap { padding: 80px 0 16px; }
        }

/* roulang page: category1 */
:root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC2;
            --primary-light: #EBF4FF;
            --accent: #F39C12;
            --accent-dark: #E08E0B;
            --bg-white: #FFFFFF;
            --bg-light: #F8F9FA;
            --text-main: #1A1A2E;
            --text-secondary: #4A5568;
            --text-muted: #A0AEC0;
            --border-color: #E2E8F0;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-xs: 4px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
            --font-heading: 'Inter', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-main);
            background: var(--bg-white);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            padding: 0;
            margin: 0;
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: var(--font-heading);
            margin: 0 0 0.5em 0;
            line-height: 1.2;
            color: var(--text-main);
        }
        p {
            margin: 0 0 1em 0;
            color: var(--text-secondary);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            height: 72px;
            display: flex;
            align-items: center;
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-heading);
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-main);
        }
        .nav-logo svg {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }
        .nav-logo span {
            white-space: nowrap;
        }

        .nav-center {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-center a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: color 0.2s ease, border-color 0.2s ease;
        }
        .nav-center a:hover,
        .nav-center a.active {
            color: var(--primary);
        }
        .nav-center a.active {
            border-bottom-color: var(--primary);
        }

        .nav-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .search-box {
            position: relative;
            display: flex;
            align-items: center;
        }
        .search-box input {
            width: 200px;
            padding: 8px 16px 8px 36px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            background: var(--bg-light);
            font-size: 0.9rem;
            color: var(--text-main);
            outline: none;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }
        .search-box input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(91, 155, 213, 0.15);
            background: var(--bg-white);
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .search-box .search-icon {
            position: absolute;
            left: 12px;
            color: var(--text-muted);
            font-size: 0.85rem;
            pointer-events: none;
        }
        .search-box .kbd-hint {
            position: absolute;
            right: 10px;
            font-size: 0.7rem;
            color: var(--text-muted);
            background: var(--border-color);
            padding: 2px 6px;
            border-radius: 4px;
            pointer-events: none;
            opacity: 0.7;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            border: 2px solid transparent;
            cursor: pointer;
            transition: all 0.25s ease;
            white-space: nowrap;
        }
        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow-card);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }
        .btn-accent:active {
            transform: translateY(0);
            box-shadow: var(--shadow-card);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }
        .btn-outline-white {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.6);
        }
        .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 6px 16px;
            font-size: 0.85rem;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text-main);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        /* Hero */
        .hero {
            padding: 120px 0 80px;
            background: linear-gradient(135deg, #FFFFFF 0%, #EBF4FF 100%);
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%235B9BD5' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
            opacity: 0.5;
            pointer-events: none;
        }
        .hero .container {
            position: relative;
            z-index: 1;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-text h1 {
            font-size: 2.75rem;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 20px;
            line-height: 1.15;
        }
        .hero-text h1 .highlight {
            color: var(--primary);
        }
        .hero-text .subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.6;
            max-width: 520px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            background: var(--bg-light);
            aspect-ratio: 4 / 3;
            position: relative;
        }
        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Section common */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-light);
        }
        .section-title {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        /* Features / 社区特色 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .feature-card .icon-circle {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.6rem;
            color: var(--primary);
            transition: background 0.3s ease, color 0.3s ease;
        }
        .feature-card:hover .icon-circle {
            background: var(--primary);
            color: #fff;
        }
        .feature-card h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* 社区数据 / Stats */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 20px;
            text-align: center;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .stat-card .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-card .stat-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* 活跃话题 / Topics */
        .topics-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .topic-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }
        .topic-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .topic-card .topic-img {
            height: 180px;
            background: var(--bg-light);
            position: relative;
            overflow: hidden;
        }
        .topic-card .topic-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .topic-card:hover .topic-img img {
            transform: scale(1.05);
        }
        .topic-card .topic-body {
            padding: 24px;
        }
        .topic-card .topic-body h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .topic-card .topic-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .topic-card .topic-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .topic-card .topic-meta .badge {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 500;
        }

        /* 加入流程 / Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 48px;
            left: 16.66%;
            right: 16.66%;
            height: 2px;
            background: var(--border-color);
            z-index: 0;
        }
        .step-card {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--bg-light);
            padding: 32px 20px 24px;
            border-radius: var(--radius-md);
            transition: transform 0.3s ease;
        }
        .step-card:hover {
            transform: translateY(-4px);
        }
        .step-card .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(91, 155, 213, 0.3);
        }
        .step-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 8px 0;
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border-color);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 4px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-main);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: color 0.2s ease;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .faq-icon {
            font-size: 1.2rem;
            color: var(--text-muted);
            transition: transform 0.3s ease;
            flex-shrink: 0;
            margin-left: 16px;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 4px;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 4px 20px;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
            line-height: 1.7;
        }

        /* CTA */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
        }
        .cta-inner {
            text-align: center;
            color: #fff;
        }
        .cta-inner h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-inner p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* Footer */
        .site-footer {
            background: #1F2937;
            color: rgba(255, 255, 255, 0.8);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-logo svg {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.6;
            margin-bottom: 0;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: color 0.2s ease;
        }
        .footer-col ul li a:hover {
            color: var(--primary-light);
        }
        .footer-col ul li a i {
            width: 20px;
            margin-right: 6px;
        }
        .footer-social {
            display: flex;
            gap: 16px;
            margin-top: 8px;
        }
        .footer-social a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            transition: all 0.25s ease;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }

        /* 移动端导航 */
        .mobile-menu {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            width: 100%;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            padding: 20px;
            box-shadow: var(--shadow-card);
            z-index: 999;
            flex-direction: column;
            gap: 12px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 10px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .mobile-menu a:last-child {
            border-bottom: none;
        }
        .mobile-menu a.active {
            color: var(--primary);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 40px;
                text-align: center;
            }
            .hero-text .subtitle {
                margin-left: auto;
                margin-right: auto;
            }
            .hero-actions {
                justify-content: center;
            }
            .hero-image {
                max-width: 600px;
                margin: 0 auto;
            }
            .features-grid,
            .topics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-center {
                display: none;
            }
            .nav-right .search-box {
                display: none;
            }
            .nav-right .btn {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .hero {
                padding: 100px 0 60px;
            }
            .hero-text h1 {
                font-size: 2rem;
            }
            .hero-text .subtitle {
                font-size: 1rem;
            }
            .section {
                padding: 56px 0;
            }
            .section-title h2 {
                font-size: 1.6rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .topics-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-card .stat-number {
                font-size: 2rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .steps-grid::before {
                display: none;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .cta-inner h2 {
                font-size: 1.5rem;
            }
            .cta-actions {
                flex-direction: column;
                align-items: center;
            }
        }

        @media (max-width: 520px) {
            .hero-text h1 {
                font-size: 1.65rem;
            }
            .hero {
                padding: 90px 0 40px;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                margin-bottom: 36px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-card {
                padding: 20px 12px;
            }
            .stat-card .stat-number {
                font-size: 1.6rem;
            }
            .feature-card {
                padding: 24px 18px;
            }
            .topic-card .topic-body {
                padding: 16px;
            }
            .footer-grid {
                gap: 24px;
            }
            .footer-brand p {
                font-size: 0.85rem;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #5B9BD5;
            --primary-dark: #4A8BC2;
            --primary-light: #EBF4FF;
            --accent: #F39C12;
            --accent-dark: #E08E0B;
            --accent-light: #FEF3E2;
            --bg-white: #FFFFFF;
            --bg-light: #F8F9FA;
            --text-main: #1A1A2E;
            --text-secondary: #4A5568;
            --text-disabled: #A0AEC0;
            --border-color: #E2E8F0;
            --radius-card: 16px;
            --radius-small: 12px;
            --radius-btn: 8px;
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', sans-serif;
            color: var(--text-main);
            background: #FFFFFF;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            transition: all 0.25s ease;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 640px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            height: 72px;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-left {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.35rem;
            color: var(--text-main);
            letter-spacing: -0.3px;
        }
        .logo-link svg {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }
        .nav-center {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-center a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 4px 0;
            transition: color 0.25s;
        }
        .nav-center a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: width 0.3s ease;
        }
        .nav-center a:hover {
            color: var(--primary);
        }
        .nav-center a:hover::after {
            width: 100%;
        }
        .nav-center a.active {
            color: var(--primary);
        }
        .nav-center a.active::after {
            width: 100%;
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 20px;
        }
        .search-box {
            position: relative;
            display: flex;
            align-items: center;
        }
        .search-box input {
            width: 200px;
            padding: 8px 16px 8px 38px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-btn);
            background: var(--bg-light);
            font-size: 0.9rem;
            color: var(--text-main);
            outline: none;
            transition: all 0.3s ease;
        }
        .search-box input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(91, 155, 213, 0.15);
            background: #FFFFFF;
            width: 260px;
        }
        .search-box input::placeholder {
            color: var(--text-disabled);
        }
        .search-box .search-icon {
            position: absolute;
            left: 12px;
            color: var(--text-disabled);
            font-size: 0.9rem;
            pointer-events: none;
        }
        .search-box .kbd-hint {
            position: absolute;
            right: 10px;
            font-size: 0.7rem;
            color: var(--text-disabled);
            background: var(--border-color);
            padding: 2px 6px;
            border-radius: 4px;
            letter-spacing: 0.5px;
            pointer-events: none;
        }
        .header-cta {
            padding: 8px 20px;
            background: var(--primary);
            color: #FFFFFF;
            border: none;
            border-radius: var(--radius-btn);
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s ease;
        }
        .header-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(91, 155, 213, 0.3);
        }
        .header-cta:focus {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text-main);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        @media (max-width: 768px) {
            .nav-center {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: #FFFFFF;
                flex-direction: column;
                padding: 20px 24px;
                gap: 16px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
            }
            .nav-center.open {
                display: flex;
            }
            .nav-center a {
                font-size: 1.05rem;
            }
            .hamburger {
                display: flex;
            }
            .search-box input {
                width: 140px;
            }
            .search-box input:focus {
                width: 180px;
            }
            .search-box .kbd-hint {
                display: none;
            }
            .header-cta {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
        }
        @media (max-width: 480px) {
            .search-box input {
                width: 100px;
            }
            .search-box input:focus {
                width: 140px;
            }
            .header-cta {
                padding: 6px 12px;
                font-size: 0.75rem;
            }
            .logo-link span {
                font-size: 1rem;
            }
        }

        /* ===== Hero ===== */
        .hero-section {
            padding: 140px 0 80px;
            background: linear-gradient(135deg, #FFFFFF 0%, #EBF4FF 60%, #F0F8FF 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -40%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(91, 155, 213, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(243, 156, 18, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-inner {
            display: flex;
            align-items: center;
            gap: 60px;
            position: relative;
            z-index: 1;
        }
        .hero-text {
            flex: 1;
        }
        .hero-text h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-main);
            letter-spacing: -0.5px;
            margin-bottom: 20px;
        }
        .hero-text h1 .highlight {
            color: var(--primary);
        }
        .hero-text .subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 32px;
            max-width: 540px;
        }
        .hero-btns {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-btns .btn-primary {
            padding: 14px 32px;
            background: var(--primary);
            color: #FFFFFF;
            border: none;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(91, 155, 213, 0.25);
        }
        .hero-btns .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(91, 155, 213, 0.35);
        }
        .hero-btns .btn-primary:focus {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .hero-btns .btn-outline {
            padding: 14px 32px;
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            border-radius: var(--radius-btn);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .hero-btns .btn-outline:hover {
            background: var(--primary);
            color: #FFFFFF;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(91, 155, 213, 0.2);
        }
        .hero-btns .btn-outline:focus {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .hero-image {
            flex: 1;
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            min-height: 320px;
            background: var(--bg-light);
            position: relative;
        }
        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .hero-image:hover img {
            transform: scale(1.03);
        }
        @media (max-width: 1024px) {
            .hero-text h1 {
                font-size: 2.5rem;
            }
        }
        @media (max-width: 768px) {
            .hero-inner {
                flex-direction: column;
                gap: 40px;
            }
            .hero-text h1 {
                font-size: 2rem;
            }
            .hero-text .subtitle {
                font-size: 1rem;
            }
            .hero-image {
                width: 100%;
                min-height: 240px;
            }
            .hero-section {
                padding: 120px 0 60px;
            }
        }
        @media (max-width: 480px) {
            .hero-text h1 {
                font-size: 1.6rem;
            }
            .hero-btns .btn-primary,
            .hero-btns .btn-outline {
                padding: 12px 24px;
                font-size: 0.9rem;
                width: 100%;
                text-align: center;
            }
            .hero-btns {
                flex-direction: column;
            }
        }

        /* ===== Section Commons ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-light);
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2.25rem;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section {
                padding: 60px 0;
            }
            .section-title h2 {
                font-size: 1.75rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }
        }

        /* ===== Features Grid ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: all 0.4s ease;
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            color: #FFFFFF;
            transition: transform 0.3s ease;
        }
        .feature-card:hover .feature-icon {
            transform: scale(1.08);
        }
        .feature-icon.blue {
            background: var(--primary);
        }
        .feature-icon.orange {
            background: var(--accent);
        }
        .feature-icon.green {
            background: #27AE60;
        }
        .feature-icon.purple {
            background: #8E44AD;
        }
        .feature-icon.teal {
            background: #1ABC9C;
        }
        .feature-icon.red {
            background: #E74C3C;
        }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .feature-card {
                padding: 24px 20px;
            }
        }

        /* ===== Community Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            padding: 28px 20px;
            text-align: center;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }
        .stat-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-number {
                font-size: 2rem;
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* ===== Activity / Timeline ===== */
        .activity-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .activity-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: all 0.4s ease;
        }
        .activity-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        .activity-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .activity-card:hover .card-img {
            transform: scale(1.05);
        }
        .activity-card .card-body {
            padding: 20px;
        }
        .activity-card .card-tag {
            display: inline-block;
            padding: 4px 12px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 4px;
            margin-bottom: 10px;
        }
        .activity-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .activity-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .activity-card .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 12px;
            font-size: 0.8rem;
            color: var(--text-disabled);
        }
        .activity-card .card-meta i {
            margin-right: 4px;
        }
        @media (max-width: 1024px) {
            .activity-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .activity-grid {
                grid-template-columns: 1fr;
            }
            .activity-card .card-img {
                height: 180px;
            }
        }

        /* ===== Topics / Tags ===== */
        .topics-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            max-width: 700px;
            margin: 0 auto;
        }
        .topic-tag {
            padding: 8px 20px;
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 100px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            transition: all 0.3s ease;
            cursor: default;
        }
        .topic-tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(91, 155, 213, 0.12);
        }
        .topic-tag.hot {
            border-color: var(--accent);
            color: var(--accent-dark);
            background: var(--accent-light);
        }
        .topic-tag.hot:hover {
            background: var(--accent);
            color: #FFFFFF;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-small);
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: 0 2px 12px rgba(91, 155, 213, 0.08);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-main);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: 16px;
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--bg-light);
            color: var(--text-secondary);
            transition: all 0.3s ease;
            font-size: 0.9rem;
        }
        .faq-item.open .faq-question .faq-icon {
            background: var(--primary);
            color: #FFFFFF;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, #4A8BC2 50%, var(--accent) 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -30%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2.5rem;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 32px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-btns {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .cta-btns .btn-white {
            padding: 14px 32px;
            background: #FFFFFF;
            color: var(--primary);
            border: none;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }
        .cta-btns .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }
        .cta-btns .btn-white:focus {
            outline: 2px solid #FFFFFF;
            outline-offset: 2px;
        }
        .cta-btns .btn-outline-white {
            padding: 14px 32px;
            background: transparent;
            color: #FFFFFF;
            border: 2px solid #FFFFFF;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .cta-btns .btn-outline-white:hover {
            background: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        .cta-btns .btn-outline-white:focus {
            outline: 2px solid #FFFFFF;
            outline-offset: 2px;
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 60px 0;
            }
            .cta-section h2 {
                font-size: 1.75rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .cta-btns .btn-white,
            .cta-btns .btn-outline-white {
                padding: 12px 24px;
                font-size: 0.9rem;
                width: 100%;
            }
            .cta-btns {
                flex-direction: column;
                align-items: center;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1F2937;
            color: rgba(255, 255, 255, 0.85);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 16px;
        }
        .footer-brand .footer-logo svg {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.65);
            max-width: 360px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: #FFFFFF;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
            transition: color 0.25s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-col ul li a:hover {
            color: var(--primary-light);
        }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 8px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            transition: all 0.3s ease;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #FFFFFF;
            transform: translateY(-3px);
        }
        .footer-bottom {
            text-align: center;
            padding: 24px 0;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }
        @media (max-width: 640px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                text-align: center;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .footer-social {
                justify-content: center;
            }
            .footer-col ul li a {
                justify-content: center;
            }
            .footer-brand .footer-logo {
                justify-content: center;
            }
        }

        /* ===== Animations ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fade-in {
            animation: fadeInUp 0.7s ease forwards;
        }
        .animate-fade-in-delay-1 {
            animation: fadeInUp 0.7s ease 0.15s forwards;
            opacity: 0;
        }
        .animate-fade-in-delay-2 {
            animation: fadeInUp 0.7s ease 0.3s forwards;
            opacity: 0;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-secondary);
            padding: 16px 0 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-secondary);
            transition: color 0.2s;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--text-disabled);
        }
        .breadcrumb .current {
            color: var(--text-main);
            font-weight: 500;
        }

        /* ===== Join Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 48px;
            left: 16%;
            right: 16%;
            height: 2px;
            background: repeating-linear-gradient(90deg, var(--border-color) 0, var(--border-color) 12px, transparent 12px, transparent 20px);
            z-index: 0;
        }
        .step-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            z-index: 1;
            transition: all 0.4s ease;
        }
        .step-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 1.3rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            transition: all 0.3s ease;
        }
        .step-card:hover .step-number {
            background: var(--primary);
            color: #FFFFFF;
        }
        .step-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps-grid::before {
                display: none;
            }
            .step-card {
                padding: 24px 20px;
            }
        }

        /* ===== Testimonial ===== */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .testimonial-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }
        .testimonial-card .quote {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
            font-style: italic;
        }
        .testimonial-card .author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card .author .avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1rem;
        }
        .testimonial-card .author .name {
            font-weight: 600;
            color: var(--text-main);
            font-size: 0.9rem;
        }
        .testimonial-card .author .role {
            font-size: 0.8rem;
            color: var(--text-disabled);
        }
        @media (max-width: 768px) {
            .testimonial-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Slogan Banner ===== */
        .slogan-banner {
            background: var(--primary-light);
            padding: 60px 0;
            text-align: center;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .slogan-banner h3 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }
        .slogan-banner p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .slogan-banner h3 {
                font-size: 1.4rem;
            }
            .slogan-banner p {
                font-size: 0.95rem;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-light);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-disabled);
        }

        /* ===== Focus Visible ===== */
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }