/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a4a;
            --primary-light: #2a3a5a;
            --primary-dark: #0f1a2e;
            --secondary: #c8952e;
            --secondary-light: #e0b050;
            --accent: #2b7fe0;
            --accent-light: #4a9af0;
            --bg: #f8f9fc;
            --bg-white: #ffffff;
            --bg-dark: #0f1a2e;
            --bg-card: #ffffff;
            --text: #1a1a2e;
            --text-light: #5a6a7e;
            --text-lighter: #8a9aaa;
            --text-white: #ffffff;
            --border: #e2e6f0;
            --border-light: #f0f2f8;
            --radius: 14px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(26, 42, 74, 0.08);
            --shadow-hover: 0 12px 40px rgba(26, 42, 74, 0.14);
            --shadow-lg: 0 20px 60px rgba(26, 42, 74, 0.12);
            --transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 76px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--primary);
        }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
            transition: var(--transition);
        }

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

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: 0.5px;
        }

        .logo i {
            color: var(--secondary);
            font-size: 26px;
        }

        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-main {
            display: flex;
            align-items: center;
            gap: 36px;
        }

        .nav-main a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            position: relative;
            padding: 6px 0;
            letter-spacing: 0.3px;
        }

        .nav-main a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2.5px;
            background: var(--secondary);
            border-radius: 4px;
            transition: var(--transition);
        }

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

        .nav-main a:hover::after {
            width: 100%;
        }

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

        .nav-main a.active::after {
            width: 100%;
            background: var(--secondary);
        }

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            background: var(--primary);
            color: var(--text-white) !important;
            border-radius: 50px;
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
            letter-spacing: 0.3px;
        }

        .nav-cta i {
            font-size: 14px;
        }

        .nav-cta:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 42, 74, 0.25);
        }

        .nav-cta::after {
            display: none !important;
        }

        /* Mobile Menu Toggle */
        .menu-toggle {
            display: none;
            font-size: 24px;
            color: var(--primary);
            padding: 8px;
            cursor: pointer;
            background: none;
            border: none;
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }

            .nav-main {
                position: fixed;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 24px 32px 32px;
                gap: 20px;
                border-bottom: 1px solid var(--border-light);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
            }

            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }

            .nav-main a {
                font-size: 17px;
                width: 100%;
                text-align: center;
                padding: 10px 0;
            }

            .nav-cta {
                width: 100%;
                justify-content: center;
                margin-top: 8px;
            }
        }

        @media (max-width: 480px) {
            .logo {
                font-size: 18px;
            }
            .logo i {
                font-size: 22px;
            }
            .header-inner {
                padding: 0 16px;
            }
        }

        /* ===== Hero Section ===== */
        .hero {
            padding: 140px 0 100px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
            position: relative;
            overflow: hidden;
            min-height: 600px;
            display: flex;
            align-items: center;
        }

        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.15;
            pointer-events: none;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 30% 50%, rgba(200, 149, 46, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 30%, rgba(43, 127, 224, 0.06) 0%, transparent 50%);
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

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

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(200, 149, 46, 0.15);
            border: 1px solid rgba(200, 149, 46, 0.25);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
            color: var(--secondary-light);
            margin-bottom: 28px;
            letter-spacing: 0.5px;
        }

        .hero-badge i {
            font-size: 12px;
        }

        .hero h1 {
            font-size: 52px;
            font-weight: 900;
            color: var(--text-white);
            line-height: 1.15;
            margin-bottom: 24px;
            letter-spacing: -0.5px;
        }

        .hero h1 .highlight {
            color: var(--secondary);
            background: linear-gradient(135deg, var(--secondary), var(--secondary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.8;
            margin-bottom: 36px;
            max-width: 620px;
        }

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

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 36px;
            background: var(--secondary);
            color: var(--primary-dark) !important;
            font-weight: 700;
            font-size: 16px;
            border-radius: 50px;
            transition: var(--transition);
            letter-spacing: 0.3px;
            box-shadow: 0 8px 30px rgba(200, 149, 46, 0.3);
        }

        .btn-primary i {
            font-size: 16px;
        }

        .btn-primary:hover {
            background: var(--secondary-light);
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(200, 149, 46, 0.4);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 36px;
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-white) !important;
            font-weight: 600;
            font-size: 16px;
            border-radius: 50px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            transition: var(--transition);
            letter-spacing: 0.3px;
        }

        .btn-secondary i {
            font-size: 16px;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.15);
            transform: translateY(-3px);
        }

        .hero-stats {
            display: flex;
            gap: 48px;
            margin-top: 52px;
            padding-top: 36px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .hero-stat {
            text-align: center;
        }

        .hero-stat .number {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-white);
            display: block;
            line-height: 1.2;
        }

        .hero-stat .label {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.55);
            margin-top: 4px;
            letter-spacing: 0.3px;
        }

        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 40px;
            }
            .hero {
                padding: 120px 0 80px;
                min-height: auto;
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 32px;
            }
            .hero p {
                font-size: 16px;
            }
            .hero-stats {
                gap: 28px;
                flex-wrap: wrap;
            }
            .hero-stat .number {
                font-size: 26px;
            }
            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-primary,
            .btn-secondary {
                justify-content: center;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 26px;
            }
            .hero {
                padding: 100px 0 60px;
            }
            .hero-stats {
                gap: 20px;
                margin-top: 32px;
                padding-top: 24px;
            }
            .hero-stat .number {
                font-size: 22px;
            }
        }

        /* ===== Section Base ===== */
        .section {
            padding: 80px 0;
        }

        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 56px;
        }

        .section-header h2 {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }

        .section-header p {
            font-size: 17px;
            color: var(--text-light);
            line-height: 1.8;
        }

        .section-header .subtitle {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            color: var(--secondary);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 12px;
        }

        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .section-header h2 {
                font-size: 28px;
            }
            .section-header p {
                font-size: 15px;
            }
        }

        @media (max-width: 480px) {
            .section {
                padding: 40px 0;
            }
            .section-header h2 {
                font-size: 24px;
            }
        }

        /* ===== Advantages Section ===== */
        .advantages {
            background: var(--bg-white);
        }

        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .advantage-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 40px 32px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            text-align: center;
        }

        .advantage-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }

        .advantage-icon {
            width: 68px;
            height: 68px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin: 0 auto 24px;
            transition: var(--transition);
        }

        .advantage-card:nth-child(1) .advantage-icon {
            background: rgba(43, 127, 224, 0.1);
            color: var(--accent);
        }

        .advantage-card:nth-child(2) .advantage-icon {
            background: rgba(200, 149, 46, 0.1);
            color: var(--secondary);
        }

        .advantage-card:nth-child(3) .advantage-icon {
            background: rgba(26, 42, 74, 0.08);
            color: var(--primary);
        }

        .advantage-card:hover .advantage-icon {
            transform: scale(1.08);
        }

        .advantage-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--primary);
        }

        .advantage-card p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .advantage-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .advantage-card {
                padding: 28px 24px;
            }
        }

        @media (max-width: 480px) {
            .advantage-card h3 {
                font-size: 18px;
            }
            .advantage-card p {
                font-size: 14px;
            }
        }

        /* ===== Process Section ===== */
        .process {
            background: var(--bg);
        }

        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .process-steps::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 8%;
            right: 8%;
            height: 2px;
            background: var(--border);
            z-index: 0;
        }

        .step-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border-light);
            position: relative;
            z-index: 1;
            transition: var(--transition);
        }

        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }

        .step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            font-size: 20px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            transition: var(--transition);
        }

        .step-card:nth-child(1) .step-number {
            background: var(--accent);
        }
        .step-card:nth-child(2) .step-number {
            background: var(--secondary);
        }
        .step-card:nth-child(3) .step-number {
            background: var(--primary);
        }
        .step-card:nth-child(4) .step-number {
            background: var(--primary-light);
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--primary);
        }

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

        @media (max-width: 768px) {
            .process-steps {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .process-steps::before {
                display: none;
            }
            .step-card {
                padding: 24px 18px;
            }
        }

        @media (max-width: 480px) {
            .process-steps {
                grid-template-columns: 1fr;
                gap: 14px;
            }
        }

        /* ===== Features Section ===== */
        .features {
            background: var(--bg-white);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .feature-card {
            display: flex;
            gap: 24px;
            background: var(--bg);
            border-radius: var(--radius);
            padding: 32px 28px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
            align-items: flex-start;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }

        .feature-img {
            width: 160px;
            min-height: 120px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--border-light);
        }

        .feature-info h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--primary);
        }

        .feature-info p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .feature-card {
                flex-direction: column;
                padding: 24px 20px;
            }
            .feature-img {
                width: 100%;
                height: 180px;
            }
        }

        @media (max-width: 480px) {
            .feature-img {
                height: 140px;
            }
            .feature-info h3 {
                font-size: 17px;
            }
        }

        /* ===== Latest Posts Section ===== */
        .latest-posts {
            background: var(--bg);
        }

        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .post-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }

        .post-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: transparent;
        }

        .post-card-inner {
            padding: 28px 24px 24px;
        }

        .post-card .post-cat {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--secondary);
            background: rgba(200, 149, 46, 0.08);
            padding: 4px 14px;
            border-radius: 50px;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .post-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 10px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .post-card h3 a {
            color: inherit;
        }

        .post-card h3 a:hover {
            color: var(--secondary);
        }

        .post-card .post-excerpt {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 16px;
        }

        .post-card .post-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-lighter);
            border-top: 1px solid var(--border-light);
            padding-top: 16px;
        }

        .post-card .post-meta .post-date {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .post-card .post-meta .post-date i {
            font-size: 12px;
        }

        .empty-notice {
            grid-column: 1 / -1;
            text-align: center;
            padding: 48px 24px;
            font-size: 16px;
            color: var(--text-light);
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }

        @media (max-width: 768px) {
            .posts-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }

        @media (max-width: 480px) {
            .posts-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .post-card-inner {
                padding: 20px 18px 18px;
            }
            .post-card h3 {
                font-size: 16px;
            }
        }

        /* ===== Security Section ===== */
        .security {
            background: var(--bg-white);
        }

        .security-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .security-item {
            text-align: center;
            padding: 32px 20px;
            border-radius: var(--radius);
            background: var(--bg);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .security-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }

        .security-icon {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            margin: 0 auto 18px;
            transition: var(--transition);
        }

        .security-item:nth-child(1) .security-icon {
            background: rgba(43, 127, 224, 0.1);
            color: var(--accent);
        }
        .security-item:nth-child(2) .security-icon {
            background: rgba(200, 149, 46, 0.1);
            color: var(--secondary);
        }
        .security-item:nth-child(3) .security-icon {
            background: rgba(26, 42, 74, 0.08);
            color: var(--primary);
        }
        .security-item:nth-child(4) .security-icon {
            background: rgba(43, 127, 224, 0.08);
            color: var(--accent);
        }

        .security-item h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--primary);
        }

        .security-item p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .security-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }

        @media (max-width: 480px) {
            .security-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .security-item {
                padding: 24px 16px;
            }
        }

        /* ===== Trust / Stats Section ===== */
        .trust {
            background: var(--primary);
            padding: 72px 0;
        }

        .trust .section-header h2 {
            color: var(--text-white);
        }

        .trust .section-header p {
            color: rgba(255, 255, 255, 0.7);
        }

        .trust-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            text-align: center;
        }

        .trust-item {
            padding: 32px 20px;
            border-radius: var(--radius);
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }

        .trust-item:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-4px);
        }

        .trust-item .number {
            font-size: 40px;
            font-weight: 900;
            color: var(--secondary);
            display: block;
            line-height: 1.2;
            margin-bottom: 8px;
        }

        .trust-item .label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
            letter-spacing: 0.5px;
        }

        @media (max-width: 768px) {
            .trust-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .trust-item .number {
                font-size: 32px;
            }
            .trust {
                padding: 48px 0;
            }
        }

        /* ===== FAQ Section ===== */
        .faq {
            background: var(--bg);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--border);
            box-shadow: var(--shadow);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            gap: 16px;
            transition: var(--transition);
        }

        .faq-question i {
            font-size: 16px;
            color: var(--secondary);
            transition: var(--transition);
            flex-shrink: 0;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-answer p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.8;
        }

        @media (max-width: 768px) {
            .faq-question {
                font-size: 15px;
                padding: 16px 18px;
            }
            .faq-answer {
                padding: 0 18px;
            }
            .faq-item.active .faq-answer {
                padding: 0 18px 16px;
            }
        }

        /* ===== CTA Section ===== */
        .cta {
            padding: 100px 0;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            position: relative;
            overflow: hidden;
        }

        .cta-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.08;
            pointer-events: none;
        }

        .cta .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .cta h2 {
            font-size: 38px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }

        .cta p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }

        .cta .btn-primary {
            font-size: 18px;
            padding: 18px 48px;
        }

        @media (max-width: 768px) {
            .cta {
                padding: 64px 0;
            }
            .cta h2 {
                font-size: 28px;
            }
            .cta p {
                font-size: 16px;
            }
            .cta .btn-primary {
                font-size: 16px;
                padding: 16px 36px;
            }
        }

        @media (max-width: 480px) {
            .cta h2 {
                font-size: 24px;
            }
            .cta p {
                font-size: 15px;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            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, 0.06);
        }

        .footer-brand .logo {
            color: var(--text-white);
            margin-bottom: 16px;
            font-size: 20px;
        }

        .footer-brand .logo span {
            background: none;
            -webkit-text-fill-color: var(--text-white);
            color: var(--text-white);
        }

        .footer-brand .logo i {
            color: var(--secondary);
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }

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

        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }

        .footer-bottom {
            padding: 24px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }

        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom-links {
            display: flex;
            gap: 24px;
        }

        .footer-bottom-links a {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

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

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-col h4 {
                margin-bottom: 14px;
            }
            .site-footer {
                padding: 40px 0 0;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }

        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-36 {
            margin-top: 36px;
        }

        /* ===== Responsive Fine-tune ===== */
        @media (max-width: 1024px) {
            .features-grid {
                gap: 24px;
            }
            .trust-grid {
                gap: 24px;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 24px;
            }
            .hero p {
                font-size: 15px;
            }
            .hero-stat .number {
                font-size: 20px;
            }
            .hero-stat .label {
                font-size: 12px;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 14px 28px;
                font-size: 15px;
            }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --accent: #d4a84b;
            --accent-light: #e8c76a;
            --accent-dark: #b88d2e;
            --bg-body: #f8f7f4;
            --bg-card: #ffffff;
            --bg-dark: #1a2a3a;
            --text-dark: #1d1d1f;
            --text-body: #3a3a3e;
            --text-muted: #6e6e73;
            --text-light: #f5f5f7;
            --border-color: #e5e5e8;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            --transition: 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-dark); line-height: 1.3; font-weight: 700; }
        h1 { font-size: 2.4rem; letter-spacing: -0.02em; }
        h2 { font-size: 1.8rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-h);
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--primary-dark);
            text-decoration: none;
            letter-spacing: -0.02em;
            transition: opacity var(--transition);
        }
        .logo:hover { color: var(--primary-dark); opacity: 0.85; }
        .logo i { color: var(--accent); font-size: 1.6rem; }
        .nav-main { display: flex; align-items: center; gap: 8px; }
        .nav-main a {
            position: relative;
            padding: 8px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            text-decoration: none;
        }
        .nav-main a:hover { color: var(--primary); background: rgba(26,58,92,0.06); }
        .nav-main a.active {
            color: var(--primary-dark);
            background: rgba(26,58,92,0.08);
            font-weight: 600;
        }
        .nav-main a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }
        .nav-main a.nav-cta {
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            padding: 8px 22px;
            border-radius: 50px;
            box-shadow: 0 2px 8px rgba(212,168,75,0.3);
        }
        .nav-main a.nav-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(212,168,75,0.35);
            color: #fff;
        }
        .nav-main a.nav-cta i { margin-right: 6px; }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-dark);
            border-radius: 2px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== Article Hero ===== */
        .article-hero {
            padding: 140px 0 48px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
            position: relative;
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .article-hero .container { position: relative; z-index: 2; }
        .article-hero h1 {
            color: #fff;
            font-size: 2.2rem;
            max-width: 880px;
            margin-bottom: 16px;
            text-shadow: 0 2px 12px rgba(0,0,0,0.2);
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px 28px;
            color: rgba(255,255,255,0.8);
            font-size: 0.9rem;
        }
        .article-meta i { margin-right: 6px; color: var(--accent); }
        .article-meta a { color: rgba(255,255,255,0.9); text-decoration: underline; text-underline-offset: 3px; }
        .article-meta a:hover { color: var(--accent-light); }

        /* ===== Article Content ===== */
        .article-section {
            padding: 56px 0 72px;
        }
        .article-wrapper {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-body);
        }
        .article-body h2, .article-body h3, .article-body h4 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--text-dark);
        }
        .article-body h2 { font-size: 1.6rem; border-left: 4px solid var(--accent); padding-left: 16px; }
        .article-body h3 { font-size: 1.25rem; }
        .article-body p { margin-bottom: 1.2rem; }
        .article-body ul, .article-body ol {
            margin: 0 0 1.2rem 1.6rem;
        }
        .article-body ul li { list-style: disc; margin-bottom: 0.3rem; }
        .article-body ol li { list-style: decimal; margin-bottom: 0.3rem; }
        .article-body img { margin: 1.5rem 0; border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
        .article-body blockquote {
            margin: 1.5rem 0;
            padding: 16px 24px;
            background: #f1f0ec;
            border-left: 4px solid var(--accent);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-muted);
            font-style: italic;
        }
        .article-body a { color: var(--primary-light); font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
        .article-body a:hover { color: var(--accent); }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
        }
        .article-body table th, .article-body table td {
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            text-align: left;
        }
        .article-body table th { background: #f1f0ec; font-weight: 600; color: var(--text-dark); }
        .article-body table tr:nth-child(even) td { background: #fafaf8; }
        .article-body code {
            background: #f1f0ec;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--primary-dark);
        }
        .article-body pre {
            background: #1d1d1f;
            color: #f5f5f7;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            font-size: 0.9rem;
            line-height: 1.6;
            margin: 1.5rem 0;
        }

        /* ===== Article Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 24px 26px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 1.05rem;
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
            display: inline-block;
        }
        .sidebar-card ul li { margin-bottom: 10px; }
        .sidebar-card ul li a {
            font-size: 0.93rem;
            color: var(--text-body);
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all var(--transition);
        }
        .sidebar-card ul li a:hover { color: var(--accent); padding-left: 4px; }
        .sidebar-card ul li a i { color: var(--accent); font-size: 0.8rem; width: 18px; }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            text-align: center;
            padding: 32px 24px;
            border: none;
        }
        .sidebar-cta h3 { color: #fff; border-bottom-color: var(--accent); }
        .sidebar-cta p { color: rgba(255,255,255,0.8); font-size: 0.92rem; margin-bottom: 18px; }
        .sidebar-cta .btn {
            background: var(--accent);
            color: #fff;
            padding: 12px 32px;
            border-radius: 50px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .sidebar-cta .btn:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(212,168,75,0.3); }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }
        .not-found-box i { font-size: 3.6rem; color: var(--text-muted); margin-bottom: 20px; display: block; }
        .not-found-box h2 { font-size: 1.6rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-muted); margin-bottom: 24px; }
        .not-found-box .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            transition: all var(--transition);
        }
        .not-found-box .btn:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: var(--shadow-md); }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.75);
            padding: 56px 0 30px;
            margin-top: 16px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }
        .footer-brand .logo { color: #fff; font-size: 1.2rem; margin-bottom: 14px; display: inline-flex; }
        .footer-brand .logo i { color: var(--accent); }
        .footer-brand p { font-size: 0.92rem; line-height: 1.7; color: rgba(255,255,255,0.6); max-width: 340px; margin-top: 10px; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: all var(--transition); display: inline-flex; align-items: center; gap: 6px; }
        .footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
        .footer-col ul li a i { font-size: 0.8rem; color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 22px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.45);
        }
        .footer-bottom-links { display: flex; gap: 20px; }
        .footer-bottom-links a { color: rgba(255,255,255,0.45); font-size: 0.85rem; }
        .footer-bottom-links a:hover { color: var(--accent); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-wrapper { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            :root { --header-h: 64px; }
            h1 { font-size: 1.8rem; }
            h2 { font-size: 1.4rem; }
            .header-inner { padding: 0 16px; }
            .nav-main { display: none; }
            .nav-main.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; width: 100%; background: rgba(255,255,255,0.98); backdrop-filter: blur(18px); border-bottom: 1px solid var(--border-color); padding: 16px 20px; gap: 4px; box-shadow: var(--shadow-lg); }
            .nav-main a { padding: 12px 16px; font-size: 1rem; width: 100%; }
            .nav-main a.active::after { display: none; }
            .nav-main a.nav-cta { text-align: center; margin-top: 6px; }
            .nav-toggle { display: flex; }
            .article-hero { padding: 110px 0 36px; min-height: 200px; }
            .article-hero h1 { font-size: 1.5rem; }
            .article-meta { gap: 12px 18px; font-size: 0.82rem; }
            .article-body { padding: 24px 20px; }
            .article-body h2 { font-size: 1.3rem; }
            .article-sidebar { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .container { padding: 0 16px; }
        }
        @media (max-width: 520px) {
            .article-hero h1 { font-size: 1.3rem; }
            .article-body { padding: 18px 14px; font-size: 0.95rem; }
            .sidebar-card { padding: 18px 18px; }
            .footer-grid { gap: 24px; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a5cff;
            --primary-dark: #0d47c4;
            --primary-light: #e8f0ff;
            --secondary: #ff6b35;
            --secondary-light: #fff0e8;
            --accent: #00c9a7;
            --accent-light: #e0faf4;
            --neutral-900: #0b1a2e;
            --neutral-800: #1a2d46;
            --neutral-700: #2c405a;
            --neutral-600: #4f6a8a;
            --neutral-500: #7895b5;
            --neutral-400: #a8c0d8;
            --neutral-300: #d0e0f0;
            --neutral-200: #e8f0f8;
            --neutral-100: #f5f9fe;
            --white: #ffffff;
            --bg-soft: #f8faff;
            --body-font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(10, 30, 60, 0.06);
            --shadow-md: 0 8px 30px rgba(10, 30, 60, 0.08);
            --shadow-lg: 0 20px 50px rgba(10, 30, 60, 0.12);
            --shadow-xl: 0 30px 70px rgba(10, 30, 60, 0.16);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-height: 72px;
            --space-xs: 8px;
            --space-sm: 16px;
            --space-md: 32px;
            --space-lg: 56px;
            --space-xl: 80px;
            --space-2xl: 120px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--body-font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--neutral-800);
            background: var(--bg-soft);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        select,
        textarea {
            font: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--neutral-900);
        }
        hr {
            border: 0;
            height: 1px;
            background: var(--neutral-300);
        }

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

        /* ===== 通用板块间距 ===== */
        .section {
            padding: var(--space-xl) 0;
        }
        .section-sm {
            padding: var(--space-lg) 0;
        }
        .section-lg {
            padding: var(--space-2xl) 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: var(--space-lg);
        }
        .section-header h2 {
            font-size: 2.2rem;
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .section-header p {
            font-size: 1.1rem;
            color: var(--neutral-600);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.8;
        }
        .section-header .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 600;
            padding: 4px 18px;
            border-radius: 50px;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 60px;
            transition: all var(--transition);
            border: 2px solid transparent;
            cursor: pointer;
            text-align: center;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--white) !important;
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(26, 92, 255, 0.3);
        }
        .btn-primary:hover,
        .btn-primary:focus-visible {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26, 92, 255, 0.4);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(26, 92, 255, 0.25);
        }
        .btn-secondary {
            background: var(--white);
            color: var(--neutral-800) !important;
            border-color: var(--neutral-300);
        }
        .btn-secondary:hover,
        .btn-secondary:focus-visible {
            border-color: var(--primary);
            color: var(--primary) !important;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(10, 30, 60, 0.08);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-ghost {
            background: transparent;
            color: var(--primary) !important;
            border-color: transparent;
            padding: 14px 20px;
        }
        .btn-ghost:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .btn-lg {
            padding: 18px 44px;
            font-size: 1.1rem;
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.9rem;
        }
        .btn .icon {
            font-size: 1.1em;
        }

        /* ===== 徽章 / 标签 ===== */
        .badge {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-green {
            background: var(--accent-light);
            color: #00997e;
        }
        .badge-orange {
            background: var(--secondary-light);
            color: #d94f1a;
        }
        .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--neutral-200);
            color: var(--neutral-600);
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--neutral-200);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--neutral-300);
        }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            background: var(--primary-light);
            margin-bottom: var(--space-sm);
        }
        .card h3 {
            font-size: 1.2rem;
            margin-bottom: 8px;
        }
        .card p {
            color: var(--neutral-600);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .card .card-link {
            margin-top: 12px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary);
        }

        /* ===== 网格 ===== */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-md);
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: var(--space-md);
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: var(--space-md);
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--neutral-200);
            height: var(--header-height);
            transition: background var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--neutral-900) !important;
            text-decoration: none;
        }
        .logo i {
            font-size: 1.5rem;
            color: var(--primary);
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-main {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-main a {
            padding: 8px 18px;
            border-radius: 60px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--neutral-700);
            transition: all var(--transition);
            text-decoration: none;
            white-space: nowrap;
        }
        .nav-main a:hover {
            background: var(--neutral-200);
            color: var(--neutral-900);
        }
        .nav-main a.active {
            background: var(--primary);
            color: var(--white) !important;
            box-shadow: 0 4px 12px rgba(26, 92, 255, 0.25);
        }
        .nav-main a.nav-cta {
            background: var(--primary);
            color: var(--white) !important;
            padding: 8px 22px;
            box-shadow: 0 4px 14px rgba(26, 92, 255, 0.25);
        }
        .nav-main a.nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 92, 255, 0.35);
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--neutral-800);
            background: none;
            border: none;
            padding: 4px;
            cursor: pointer;
        }

        /* ===== Hero ===== */
        .hero {
            padding: calc(var(--header-height) + 60px) 0 80px;
            background: var(--neutral-900);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 26, 46, 0.88) 0%, rgba(11, 26, 46, 0.72) 100%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: var(--white);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        .hero h1 span {
            color: #5a9aff;
        }
        .hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }
        .hero .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .hero .btn-primary {
            background: var(--secondary);
            border-color: var(--secondary);
            box-shadow: 0 4px 20px rgba(255, 107, 53, 0.35);
        }
        .hero .btn-primary:hover {
            background: #e55a2b;
            border-color: #e55a2b;
            box-shadow: 0 8px 30px rgba(255, 107, 53, 0.45);
        }
        .hero .btn-ghost {
            color: var(--white) !important;
            border-color: rgba(255, 255, 255, 0.3);
        }
        .hero .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.5);
        }
        .hero-breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
        }
        .hero-breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .hero-breadcrumb a:hover {
            color: var(--white);
        }
        .hero-breadcrumb .sep {
            color: rgba(255, 255, 255, 0.35);
        }

        /* ===== 特色板块 (features) ===== */
        .features-grid .card {
            text-align: center;
            padding: var(--space-md) var(--space-sm);
        }
        .features-grid .card-icon {
            margin: 0 auto var(--space-sm);
        }

        /* ===== 场景板块 (scenarios) ===== */
        .scenario-card {
            display: flex;
            gap: 24px;
            align-items: flex-start;
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--neutral-200);
            transition: all var(--transition);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--neutral-300);
        }
        .scenario-card .scenario-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--primary);
            background: var(--primary-light);
        }
        .scenario-card h3 {
            font-size: 1.1rem;
            margin-bottom: 4px;
        }
        .scenario-card p {
            color: var(--neutral-600);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ===== 流程步骤 ===== */
        .steps {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: center;
            counter-reset: step;
        }
        .step-item {
            flex: 1 1 180px;
            max-width: 240px;
            text-align: center;
            position: relative;
            counter-increment: step;
        }
        .step-item::before {
            content: counter(step);
            display: block;
            width: 48px;
            height: 48px;
            line-height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--white);
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 auto 16px;
            box-shadow: 0 4px 16px rgba(26, 92, 255, 0.25);
        }
        .step-item h4 {
            font-size: 1.05rem;
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 0.88rem;
            color: var(--neutral-600);
            line-height: 1.6;
        }
        .step-item:not(:last-child)::after {
            content: '';
            position: absolute;
            top: 24px;
            right: -20px;
            width: 16px;
            height: 2px;
            background: var(--neutral-300);
        }

        /* ===== 安全认证 ===== */
        .security-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            margin-top: var(--space-md);
        }
        .security-badge {
            display: flex;
            align-items: center;
            gap: 12px;
            background: var(--white);
            padding: 16px 28px;
            border-radius: 60px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--neutral-200);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--neutral-800);
        }
        .security-badge i {
            font-size: 1.3rem;
            color: var(--accent);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--white);
            border-radius: var(--radius-md);
            border: 1px solid var(--neutral-200);
            padding: 0;
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--neutral-300);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--neutral-800);
            background: transparent;
            border: none;
            cursor: pointer;
            text-align: left;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: var(--neutral-100);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 24px;
            text-align: center;
            color: var(--primary);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.95rem;
            color: var(--neutral-600);
            line-height: 1.8;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--neutral-900);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
            padding: var(--space-2xl) 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 26, 46, 0.9) 0%, rgba(11, 26, 46, 0.75) 100%);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            color: var(--white);
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--neutral-900);
            color: rgba(255, 255, 255, 0.75);
            padding: var(--space-xl) 0 0;
        }
        .site-footer .logo {
            color: var(--white) !important;
            margin-bottom: 12px;
        }
        .site-footer .logo i {
            color: #5a9aff;
        }
        .site-footer .logo span {
            -webkit-text-fill-color: var(--white);
            background: none;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: var(--space-md);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--white);
            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 var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--white);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }
        .footer-bottom-links a {
            color: rgba(255, 255, 255, 0.45);
            font-size: 0.85rem;
        }
        .footer-bottom-links a:hover {
            color: rgba(255, 255, 255, 0.8);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .grid-4 {
                grid-template-columns: 1fr 1fr;
            }
            .hero h1 {
                font-size: 2.4rem;
            }
        }
        @media (max-width: 768px) {
            :root {
                --space-xl: 56px;
                --space-2xl: 80px;
                --space-lg: 40px;
                --space-md: 24px;
            }
            .nav-toggle {
                display: block;
            }
            .nav-main {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--white);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                box-shadow: 0 12px 40px rgba(10, 30, 60, 0.12);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
                pointer-events: none;
            }
            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-main a {
                width: 100%;
                padding: 12px 18px;
                font-size: 1rem;
            }
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .hero {
                min-height: 320px;
                padding: calc(var(--header-height) + 40px) 0 60px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .section-header h2 {
                font-size: 1.6rem;
            }
            .steps {
                flex-direction: column;
                align-items: center;
            }
            .step-item {
                max-width: 100%;
                flex: 1 1 auto;
                display: flex;
                gap: 16px;
                align-items: flex-start;
                text-align: left;
            }
            .step-item::before {
                margin: 0;
                flex-shrink: 0;
            }
            .step-item:not(:last-child)::after {
                display: none;
            }
            .scenario-card {
                flex-direction: column;
                align-items: flex-start;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .security-badge {
                width: 100%;
                justify-content: center;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .hero p {
                font-size: 0.92rem;
            }
            .hero .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
            .section-header h2 {
                font-size: 1.4rem;
            }
            .card {
                padding: var(--space-sm);
            }
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px 14px;
                font-size: 0.88rem;
            }
        }

        /* ===== 可访问性 ===== */
        :focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ===== 附加组件 ===== */
        .bg-soft {
            background: var(--bg-soft);
        }
        .bg-white {
            background: var(--white);
        }
        .text-center {
            text-align: center;
        }
        .mt-sm {
            margin-top: var(--space-sm);
        }
        .mt-md {
            margin-top: var(--space-md);
        }
        .mt-lg {
            margin-top: var(--space-lg);
        }
        .gap-sm {
            gap: var(--space-sm);
        }
        .gap-md {
            gap: var(--space-md);
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

        /* ===== 封面图样式 ===== */
        .cover-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: var(--radius-md);
            margin-bottom: var(--space-sm);
        }
        .cover-img-lg {
            height: 280px;
        }
        .cover-img-round {
            border-radius: 50%;
            width: 80px;
            height: 80px;
            object-fit: cover;
        }

        /* ===== 分隔装饰 ===== */
        .divider {
            width: 60px;
            height: 4px;
            background: var(--primary);
            border-radius: 4px;
            margin: 12px auto 20px;
        }
        .divider-left {
            margin: 12px 0 20px;
        }