/* roulang page: index */
/* ===== CSS Variables / Design System ===== */
        :root {
            --clr-primary: #2563eb;
            --clr-primary-dark: #1d4ed8;
            --clr-primary-light: #3b82f6;
            --clr-secondary: #7c3aed;
            --clr-secondary-dark: #6d28d9;
            --clr-accent: #f59e0b;
            --clr-dark: #0f172a;
            --clr-text: #1e293b;
            --clr-text-light: #475569;
            --clr-text-muted: #94a3b8;
            --clr-bg: #ffffff;
            --clr-bg-light: #f8fafc;
            --clr-bg-alt: #f1f5f9;
            --clr-border: #e2e8f0;
            --clr-border-light: #f1f5f9;
            --clr-white: #ffffff;
            --clr-black: #0a0a0a;
            --clr-success: #10b981;
            --clr-warning: #f59e0b;
            --clr-danger: #ef4444;
            --clr-hero-overlay: rgba(15, 23, 42, 0.65);
            --clr-glass-bg: rgba(255, 255, 255, 0.12);
            --clr-glass-border: rgba(255, 255, 255, 0.18);
            --clr-glass-blur: 16px;
            --clr-nav-scrolled: rgba(255, 255, 255, 0.96);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --radius-full: 9999px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.10), 0 4px 8px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.12);
            --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
            --space-xs: 0.25rem;
            --space-sm: 0.5rem;
            --space-md: 1rem;
            --space-lg: 1.5rem;
            --space-xl: 2rem;
            --space-2xl: 3rem;
            --space-3xl: 4rem;
            --space-4xl: 6rem;
            --container-max: 1200px;
            --container-narrow: 860px;
            --header-height: 72px;
        }

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

        html {
            font-size: 16px;
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            color: var(--clr-text);
            background: var(--clr-bg);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

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

        a:focus-visible {
            outline: 2px solid var(--clr-primary);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        button:focus-visible {
            outline: 2px solid var(--clr-primary);
            outline-offset: 2px;
        }

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

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--clr-dark);
        }

        h1 {
            font-size: clamp(2.2rem, 5.5vw, 3.8rem);
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: clamp(1.6rem, 3.6vw, 2.6rem);
            letter-spacing: -0.015em;
        }
        h3 {
            font-size: clamp(1.2rem, 2.4vw, 1.6rem);
        }
        h4 {
            font-size: 1.15rem;
        }
        h5 {
            font-size: 1rem;
        }
        h6 {
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        p {
            margin-bottom: var(--space-md);
            color: var(--clr-text-light);
        }

        p:last-child {
            margin-bottom: 0;
        }

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--space-lg);
        }

        .container-narrow {
            max-width: var(--container-narrow);
        }

        .section-padding {
            padding: var(--space-4xl) 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: var(--space-xl);
        }

        .section-title h2 {
            margin-bottom: var(--space-sm);
        }

        .section-title p {
            font-size: 1.1rem;
            max-width: 640px;
            margin: 0 auto;
            color: var(--clr-text-muted);
        }

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

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: var(--space-sm);
            padding: 0.75rem 1.75rem;
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
            border-radius: var(--radius-full);
            transition: all var(--transition-base);
            border: 2px solid transparent;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
        }

        .btn-primary:hover,
        .btn-primary:focus-visible {
            background: var(--clr-primary-dark);
            border-color: var(--clr-primary-dark);
            box-shadow: 0 6px 24px rgba(37, 99, 235, 0.45);
            transform: translateY(-2px);
            color: var(--clr-white);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.30);
        }

        .btn-secondary {
            background: transparent;
            color: var(--clr-white);
            border-color: rgba(255, 255, 255, 0.5);
        }

        .btn-secondary:hover,
        .btn-secondary:focus-visible {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--clr-white);
            transform: translateY(-2px);
            color: var(--clr-white);
        }

        .btn-secondary:active {
            transform: translateY(0);
        }

        .btn-outline {
            background: transparent;
            color: var(--clr-primary);
            border-color: var(--clr-primary);
        }

        .btn-outline:hover,
        .btn-outline:focus-visible {
            background: var(--clr-primary);
            color: var(--clr-white);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .btn-outline:active {
            transform: translateY(0);
        }

        .btn-lg {
            padding: 1rem 2.5rem;
            font-size: 1.1rem;
        }

        .btn-sm {
            padding: 0.5rem 1.2rem;
            font-size: 0.875rem;
        }

        .btn .fa {
            font-size: 0.9em;
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: var(--radius-full);
            background: var(--clr-bg-alt);
            color: var(--clr-text-light);
            letter-spacing: 0.02em;
            transition: background var(--transition-fast);
        }

        .badge-primary {
            background: rgba(37, 99, 235, 0.10);
            color: var(--clr-primary);
        }

        .badge-success {
            background: rgba(16, 185, 129, 0.10);
            color: var(--clr-success);
        }

        .badge-warning {
            background: rgba(245, 158, 11, 0.10);
            color: var(--clr-accent);
        }

        /* ===== Card ===== */
        .card {
            background: var(--clr-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--clr-border);
            padding: var(--space-xl);
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }

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

        .card-icon {
            width: 56px;
            height: 56px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            font-size: 1.5rem;
            color: var(--clr-primary);
            background: rgba(37, 99, 235, 0.08);
            margin-bottom: var(--space-md);
            transition: all var(--transition-fast);
        }

        .card:hover .card-icon {
            background: var(--clr-primary);
            color: var(--clr-white);
        }

        .card h3 {
            font-size: 1.2rem;
            margin-bottom: var(--space-sm);
            color: var(--clr-dark);
        }

        .card p {
            font-size: 0.95rem;
            color: var(--clr-text-light);
            margin-bottom: 0;
        }

        /* ===== Section Divider ===== */
        .section-divider {
            width: 80px;
            height: 4px;
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            border-radius: var(--radius-full);
            margin: 0 auto var(--space-lg);
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--clr-glass-bg);
            backdrop-filter: blur(var(--clr-glass-blur));
            -webkit-backdrop-filter: blur(var(--clr-glass-blur));
            border-bottom: 1px solid var(--clr-glass-border);
            transition: all var(--transition-base);
        }

        .site-header.scrolled {
            background: var(--clr-nav-scrolled);
            border-bottom-color: var(--clr-border);
            box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
        }

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

        .site-logo {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--clr-white);
            letter-spacing: -0.02em;
            transition: color var(--transition-fast);
            flex-shrink: 0;
        }

        .site-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: rgba(255, 255, 255, 0.20);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--clr-white);
            border: 1px solid rgba(255, 255, 255, 0.25);
        }

        .site-header.scrolled .site-logo {
            color: var(--clr-dark);
        }

        .site-header.scrolled .site-logo .logo-icon {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
        }

        .site-header.scrolled .site-logo .logo-icon {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: var(--space-xs);
        }

        .nav-list a {
            padding: 0.5rem 1rem;
            font-size: 0.9rem;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.80);
            border-radius: var(--radius-full);
            transition: all var(--transition-fast);
            position: relative;
        }

        .nav-list a:hover {
            color: var(--clr-white);
            background: rgba(255, 255, 255, 0.10);
        }

        .nav-list a.active {
            color: var(--clr-white);
            background: rgba(255, 255, 255, 0.15);
            font-weight: 600;
        }

        .site-header.scrolled .nav-list a {
            color: var(--clr-text-light);
        }

        .site-header.scrolled .nav-list a:hover {
            color: var(--clr-primary);
            background: rgba(37, 99, 235, 0.06);
        }

        .site-header.scrolled .nav-list a.active {
            color: var(--clr-primary);
            background: rgba(37, 99, 235, 0.10);
        }

        .nav-cta {
            margin-left: var(--space-sm);
        }

        .nav-cta .btn {
            padding: 0.45rem 1.25rem;
            font-size: 0.85rem;
        }

        .mobile-toggle {
            display: none;
            font-size: 1.4rem;
            color: var(--clr-white);
            padding: var(--space-sm);
            border-radius: var(--radius-sm);
            transition: color var(--transition-fast);
            cursor: pointer;
        }

        .site-header.scrolled .mobile-toggle {
            color: var(--clr-dark);
        }

        /* ===== Mobile Navigation ===== */
        @media (max-width: 768px) {
            .nav-list {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(15, 23, 42, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: var(--space-lg);
                gap: var(--space-sm);
                border-bottom: 1px solid rgba(255, 255, 255, 0.08);
                transform: translateY(-120%);
                opacity: 0;
                transition: all var(--transition-base);
                pointer-events: none;
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            }

            .site-header.scrolled .nav-list {
                background: rgba(255, 255, 255, 0.98);
                border-bottom-color: var(--clr-border);
            }

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

            .nav-list a {
                padding: 0.75rem 1rem;
                font-size: 1rem;
                width: 100%;
                text-align: left;
                color: rgba(255, 255, 255, 0.85);
                border-radius: var(--radius-md);
            }

            .site-header.scrolled .nav-list a {
                color: var(--clr-text);
            }

            .nav-list a:hover {
                background: rgba(255, 255, 255, 0.08);
            }

            .site-header.scrolled .nav-list a:hover {
                background: rgba(37, 99, 235, 0.06);
            }

            .nav-cta {
                margin-left: 0;
                margin-top: var(--space-sm);
                width: 100%;
            }

            .nav-cta .btn {
                width: 100%;
                justify-content: center;
                padding: 0.75rem 1rem;
            }

            .mobile-toggle {
                display: block;
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--clr-dark);
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
        }

        .hero-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center;
            border-radius: 0;
        }

        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg,
                    rgba(15, 23, 42, 0.80) 0%,
                    rgba(15, 23, 42, 0.55) 50%,
                    rgba(15, 23, 42, 0.75) 100%);
            z-index: 1;
        }

        .hero-overlay-glow {
            position: absolute;
            inset: 0;
            z-index: 1;
            background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 30%, rgba(124, 58, 237, 0.10) 0%, transparent 50%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            padding: var(--space-xl);
            color: var(--clr-white);
        }

        .hero-badge {
            display: inline-block;
            padding: 0.35rem 1.2rem;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: var(--radius-full);
            background: rgba(255, 255, 255, 0.12);
            color: rgba(255, 255, 255, 0.90);
            border: 1px solid rgba(255, 255, 255, 0.15);
            margin-bottom: var(--space-lg);
            letter-spacing: 0.03em;
            backdrop-filter: blur(4px);
        }

        .hero h1 {
            color: var(--clr-white);
            font-weight: 800;
            margin-bottom: var(--space-lg);
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.20);
        }

        .hero h1 .highlight {
            background: linear-gradient(135deg, #60a5fa, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-sub {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: rgba(255, 255, 255, 0.80);
            max-width: 640px;
            margin: 0 auto var(--space-xl);
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-md);
            justify-content: center;
            margin-bottom: var(--space-xl);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-xl) var(--space-2xl);
            justify-content: center;
            padding-top: var(--space-lg);
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            margin-top: var(--space-lg);
        }

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

        .hero-stat-item .num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--clr-white);
            line-height: 1.2;
        }

        .hero-stat-item .label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.60);
            margin-top: var(--space-xs);
        }

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

        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-xl);
        }

        @media (max-width: 768px) {
            .advantages-grid {
                grid-template-columns: 1fr;
            }
        }

        .advantage-card {
            background: var(--clr-white);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl) var(--space-xl);
            text-align: center;
            border: 1px solid var(--clr-border);
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }

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

        .advantage-card .icon-wrap {
            width: 64px;
            height: 64px;
            margin: 0 auto var(--space-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            font-size: 1.6rem;
            color: var(--clr-primary);
            background: rgba(37, 99, 235, 0.08);
            transition: all var(--transition-base);
        }

        .advantage-card:hover .icon-wrap {
            background: var(--clr-primary);
            color: var(--clr-white);
            transform: scale(1.05);
        }

        .advantage-card h3 {
            font-size: 1.2rem;
            margin-bottom: var(--space-sm);
        }

        .advantage-card p {
            font-size: 0.95rem;
            color: var(--clr-text-light);
        }

        /* ===== How It Works ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-xl);
            position: relative;
        }

        @media (max-width: 900px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        .step-card {
            text-align: center;
            position: relative;
        }

        .step-number {
            width: 48px;
            height: 48px;
            margin: 0 auto var(--space-md);
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-full);
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--clr-white);
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.25);
        }

        .step-card h4 {
            font-size: 1.1rem;
            margin-bottom: var(--space-sm);
            color: var(--clr-dark);
        }

        .step-card p {
            font-size: 0.9rem;
            color: var(--clr-text-light);
        }

        .step-connector {
            display: none;
        }

        @media (min-width: 901px) {
            .step-connector {
                display: block;
                position: absolute;
                top: 24px;
                left: calc(50% + 40px);
                width: calc(100% - 80px);
                height: 2px;
                background: linear-gradient(90deg, var(--clr-primary), var(--clr-secondary));
                opacity: 0.3;
                pointer-events: none;
            }

            .step-card:last-child .step-connector {
                display: none;
            }
        }

        /* ===== Latest News / CMS ===== */
        .news-section {
            background: var(--clr-bg);
        }

        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-xl);
        }

        @media (max-width: 768px) {
            .news-grid {
                grid-template-columns: 1fr;
            }
        }

        .news-card {
            background: var(--clr-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }

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

        .news-card-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }

        .news-card-body {
            padding: var(--space-lg);
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .news-card-meta {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 0.8rem;
            color: var(--clr-text-muted);
            margin-bottom: var(--space-sm);
        }

        .news-card-meta .badge {
            font-size: 0.7rem;
        }

        .news-card h3 {
            font-size: 1.05rem;
            margin-bottom: var(--space-sm);
            color: var(--clr-dark);
            line-height: 1.4;
            flex: 1;
        }

        .news-card h3 a {
            color: inherit;
            transition: color var(--transition-fast);
        }

        .news-card h3 a:hover {
            color: var(--clr-primary);
        }

        .news-card p {
            font-size: 0.9rem;
            color: var(--clr-text-light);
            margin-bottom: var(--space-md);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-card .read-link {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--clr-primary);
            display: inline-flex;
            align-items: center;
            gap: var(--space-xs);
            transition: gap var(--transition-fast);
        }

        .news-card .read-link:hover {
            gap: var(--space-sm);
        }

        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: var(--space-3xl) var(--space-xl);
            color: var(--clr-text-muted);
            font-size: 1.05rem;
            background: var(--clr-bg-alt);
            border-radius: var(--radius-lg);
        }

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

        .features-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-3xl);
            align-items: center;
        }

        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }
            .features-grid .feature-image {
                order: -1;
            }
        }

        .feature-image img {
            width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
        }

        .feature-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-lg);
        }

        .feature-item {
            display: flex;
            gap: var(--space-md);
            align-items: flex-start;
        }

        .feature-item .fi-icon {
            width: 40px;
            height: 40px;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            font-size: 1.1rem;
            color: var(--clr-primary);
            background: rgba(37, 99, 235, 0.08);
            margin-top: 2px;
        }

        .feature-item h4 {
            font-size: 1.05rem;
            margin-bottom: var(--space-xs);
            color: var(--clr-dark);
        }

        .feature-item p {
            font-size: 0.9rem;
            color: var(--clr-text-light);
            margin-bottom: 0;
        }

        /* ===== Testimonials ===== */
        .testimonials {
            background: var(--clr-bg);
        }

        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-xl);
        }

        @media (max-width: 768px) {
            .testimonials-grid {
                grid-template-columns: 1fr;
            }
        }

        .testimonial-card {
            background: var(--clr-white);
            border-radius: var(--radius-lg);
            border: 1px solid var(--clr-border);
            padding: var(--space-xl);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        .testimonial-stars {
            color: var(--clr-accent);
            font-size: 0.9rem;
            margin-bottom: var(--space-sm);
        }

        .testimonial-text {
            font-size: 0.95rem;
            color: var(--clr-text-light);
            font-style: italic;
            margin-bottom: var(--space-lg);
            line-height: 1.7;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: var(--space-md);
        }

        .testimonial-author .avatar {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-full);
            background: linear-gradient(135deg, var(--clr-primary), var(--clr-secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--clr-white);
            font-weight: 700;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .testimonial-author .info .name {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--clr-dark);
        }

        .testimonial-author .info .role {
            font-size: 0.8rem;
            color: var(--clr-text-muted);
        }

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

        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }

        .faq-item {
            background: var(--clr-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: all var(--transition-fast);
        }

        .faq-item:hover {
            border-color: var(--clr-primary-light);
        }

        .faq-question {
            width: 100%;
            padding: var(--space-lg);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-md);
            font-size: 1rem;
            font-weight: 600;
            color: var(--clr-dark);
            background: transparent;
            text-align: left;
            cursor: pointer;
            transition: color var(--transition-fast);
        }

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

        .faq-question .fa {
            font-size: 0.85rem;
            color: var(--clr-text-muted);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
        }

        .faq-item.open .faq-question .fa {
            transform: rotate(180deg);
            color: var(--clr-primary);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-base), padding var(--transition-base);
            padding: 0 var(--space-lg);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 var(--space-lg) var(--space-lg);
        }

        .faq-answer p {
            font-size: 0.95rem;
            color: var(--clr-text-light);
            margin-bottom: 0;
            line-height: 1.7;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--clr-dark);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 50%, rgba(124, 58, 237, 0.08) 0%, transparent 50%);
            z-index: 1;
        }

        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: var(--space-4xl) var(--space-xl);
            color: var(--clr-white);
        }

        .cta-content h2 {
            color: var(--clr-white);
            margin-bottom: var(--space-md);
        }

        .cta-content p {
            color: rgba(255, 255, 255, 0.70);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto var(--space-xl);
        }

        .cta-content .btn {
            font-size: 1.05rem;
            padding: 1rem 2.5rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--clr-dark);
            color: rgba(255, 255, 255, 0.70);
            padding: var(--space-3xl) 0 var(--space-xl);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--space-2xl);
            margin-bottom: var(--space-2xl);
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-xl);
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }

        .footer-brand .site-logo {
            color: var(--clr-white);
            font-size: 1.2rem;
            margin-bottom: var(--space-md);
            display: inline-flex;
        }

        .footer-brand .site-logo .logo-icon {
            background: var(--clr-primary);
            color: var(--clr-white);
            border-color: var(--clr-primary);
        }

        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
            line-height: 1.7;
        }

        .footer-col h5 {
            color: var(--clr-white);
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: var(--space-md);
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        .footer-col ul li {
            margin-bottom: var(--space-sm);
        }

        .footer-col ul li a {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            transition: color var(--transition-fast);
        }

        .footer-col ul li a:hover {
            color: var(--clr-white);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: var(--space-lg);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: var(--space-md);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.40);
        }

        @media (max-width: 520px) {
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.50);
        }

        .footer-bottom a:hover {
            color: var(--clr-white);
        }

        /* ===== Responsive Helpers ===== */
        @media (max-width: 1024px) {
            .container {
                padding: 0 var(--space-md);
            }
            .section-padding {
                padding: var(--space-3xl) 0;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .section-padding {
                padding: var(--space-2xl) 0;
            }
            .hero h1 {
                font-size: clamp(1.8rem, 7vw, 2.6rem);
            }
            .hero-stats {
                gap: var(--space-lg);
            }
            .hero-stat-item .num {
                font-size: 1.4rem;
            }
            .features-grid {
                gap: var(--space-lg);
            }
            .news-grid {
                gap: var(--space-md);
            }
            .testimonials-grid {
                gap: var(--space-md);
            }
        }

        @media (max-width: 520px) {
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn {
                width: 100%;
                max-width: 280px;
            }
            .hero-stats {
                flex-direction: column;
                gap: var(--space-md);
            }
            .advantages-grid {
                gap: var(--space-md);
            }
            .steps-grid {
                gap: var(--space-lg);
            }
            .faq-question {
                font-size: 0.95rem;
                padding: var(--space-md);
            }
            .faq-answer {
                padding: 0 var(--space-md);
            }
            .faq-item.open .faq-answer {
                padding: 0 var(--space-md) var(--space-md);
            }
            .cta-content {
                padding: var(--space-2xl) var(--space-md);
            }
        }

        /* ===== Animations ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate-in {
            animation: fadeInUp 0.6s ease-out forwards;
        }

        .animate-delay-1 {
            animation-delay: 0.1s;
        }
        .animate-delay-2 {
            animation-delay: 0.2s;
        }
        .animate-delay-3 {
            animation-delay: 0.3s;
        }
        .animate-delay-4 {
            animation-delay: 0.4s;
        }

        /* ===== Utility ===== */
        .mt-sm {
            margin-top: var(--space-sm);
        }
        .mt-md {
            margin-top: var(--space-md);
        }
        .mt-lg {
            margin-top: var(--space-lg);
        }
        .mt-xl {
            margin-top: var(--space-xl);
        }
        .mb-sm {
            margin-bottom: var(--space-sm);
        }
        .mb-md {
            margin-bottom: var(--space-md);
        }
        .mb-lg {
            margin-bottom: var(--space-lg);
        }
        .mb-xl {
            margin-bottom: var(--space-xl);
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #3a4a8c;
            --primary-dark: #0e1a4a;
            --accent: #d4a84b;
            --accent-light: #e8c56e;
            --accent-dark: #b88a2e;
            --bg-light: #f8f7f4;
            --bg-white: #ffffff;
            --bg-dark: #0f1428;
            --text-dark: #1e1e2a;
            --text-muted: #6b6b7a;
            --text-light: #f0efe8;
            --border-light: rgba(26, 42, 108, 0.10);
            --border-accent: rgba(212, 168, 75, 0.30);
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.12);
            --shadow-glow: 0 0 30px rgba(212, 168, 75, 0.15);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container-max: 1200px;
            --nav-height: 72px;
        }

        /* ===== 基础重置 ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; }
        body {
            font-family: var(--font-sans);
            color: var(--text-dark);
            background: var(--bg-light);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        ul { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--primary-dark); }
        .container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; width: 100%; }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            height: var(--nav-height);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            background: rgba(255, 255, 255, 0.60);
            border-bottom: 1px solid rgba(255, 255, 255, 0.25);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
            transition: var(--transition);
        }
        .site-header.scrolled {
            background: rgba(255, 255, 255, 0.92);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            height: var(--nav-height); max-width: var(--container-max);
            margin: 0 auto; padding: 0 24px;
        }
        .site-logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.35rem; font-weight: 700; color: var(--primary-dark);
            letter-spacing: 0.5px;
        }
        .site-logo .logo-icon { color: var(--accent); font-size: 1.5rem; }
        .site-logo:hover { color: var(--primary); opacity: 0.9; }
        .nav-list { display: flex; align-items: center; gap: 8px; }
        .nav-list a {
            padding: 8px 18px; border-radius: var(--radius-sm);
            font-size: 0.95rem; font-weight: 500; color: var(--text-dark);
            transition: var(--transition); position: relative;
        }
        .nav-list a::after {
            content: ''; position: absolute; bottom: 2px; left: 18px; right: 18px;
            height: 2px; background: var(--accent); border-radius: 2px;
            transform: scaleX(0); transition: var(--transition);
        }
        .nav-list a:hover { color: var(--primary); background: rgba(26, 42, 108, 0.04); }
        .nav-list a:hover::after { transform: scaleX(0.5); }
        .nav-list a.active { color: var(--primary); font-weight: 600; }
        .nav-list a.active::after { transform: scaleX(1); }
        .nav-cta { margin-left: 12px; }
        .btn { display: inline-flex; align-items: center; gap: 8px; font-weight: 600;
            border-radius: var(--radius-sm); transition: var(--transition);
            cursor: pointer; border: none; font-family: inherit; }
        .btn-sm { padding: 8px 22px; font-size: 0.9rem; }
        .btn-md { padding: 12px 32px; font-size: 1rem; }
        .btn-lg { padding: 16px 42px; font-size: 1.1rem; border-radius: var(--radius-md); }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff; box-shadow: 0 4px 16px rgba(212, 168, 75, 0.30);
        }
        .btn-primary:hover { background: linear-gradient(135deg, var(--accent-light), var(--accent)); color: #fff; box-shadow: 0 8px 28px rgba(212, 168, 75, 0.40); transform: translateY(-2px); }
        .btn-outline {
            background: transparent; border: 2px solid var(--accent);
            color: var(--accent-dark);
        }
        .btn-outline:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-2px); }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.6rem; color: var(--primary-dark); cursor: pointer; padding: 4px; }

        /* ===== Hero ===== */
        .hero-section {
            position: relative; min-height: 80vh;
            display: flex; align-items: center;
            padding: calc(var(--nav-height) + 40px) 0 80px;
            background: linear-gradient(135deg, #0f1428 0%, #1a2a6c 50%, #2a3a7c 100%);
            overflow: hidden;
        }
        .hero-section::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.20; pointer-events: none;
        }
        .hero-section::after {
            content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
            height: 120px; background: linear-gradient(to top, var(--bg-light), transparent);
        }
        .hero-content { position: relative; z-index: 2; }
        .hero-badge {
            display: inline-block; padding: 6px 20px; border-radius: 50px;
            background: rgba(212, 168, 75, 0.18); border: 1px solid rgba(212, 168, 75, 0.30);
            color: var(--accent-light); font-size: 0.85rem; font-weight: 500;
            margin-bottom: 20px; letter-spacing: 1px;
        }
        .hero-title {
            font-size: 3.2rem; font-weight: 800; color: #fff;
            line-height: 1.15; margin-bottom: 20px; max-width: 720px;
        }
        .hero-title span { color: var(--accent-light); }
        .hero-desc {
            font-size: 1.15rem; color: rgba(255, 255, 255, 0.80);
            max-width: 600px; margin-bottom: 32px; line-height: 1.7;
        }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero-stat { display: flex; gap: 40px; margin-top: 48px; flex-wrap: wrap; }
        .hero-stat-item { color: rgba(255, 255, 255, 0.80); }
        .hero-stat-item strong { display: block; font-size: 1.8rem; color: var(--accent-light); font-weight: 700; }
        .hero-stat-item span { font-size: 0.9rem; opacity: 0.75; }

        /* ===== 板块通用 ===== */
        .section { padding: 80px 0; }
        .section-alt { background: var(--bg-white); }
        .section-dark { background: var(--bg-dark); color: var(--text-light); }
        .section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }
        .section-label {
            display: inline-block; padding: 4px 16px; border-radius: 50px;
            background: rgba(212, 168, 75, 0.12); color: var(--accent-dark);
            font-size: 0.8rem; font-weight: 600; letter-spacing: 1px;
            margin-bottom: 16px; text-transform: uppercase;
        }
        .section-title {
            font-size: 2.4rem; font-weight: 700; margin-bottom: 16px;
            color: var(--primary-dark);
        }
        .section-title.light { color: #fff; }
        .section-desc {
            font-size: 1.05rem; color: var(--text-muted);
            max-width: 600px; margin-bottom: 48px; line-height: 1.7;
        }
        .section-desc.light { color: rgba(255, 255, 255, 0.70); }
        .text-center { text-align: center; }
        .text-center .section-desc { margin-left: auto; margin-right: auto; }

        /* ===== 网格 ===== */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
        .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 30px; }
        .grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 24px; }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-white); border-radius: var(--radius-md);
            padding: 32px 28px; box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
        .card-icon { font-size: 2.2rem; color: var(--accent); margin-bottom: 18px; }
        .card h3 { font-size: 1.25rem; margin-bottom: 10px; color: var(--primary-dark); }
        .card p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; }
        .card .card-badge {
            display: inline-block; padding: 2px 12px; border-radius: 50px;
            background: rgba(212, 168, 75, 0.10); color: var(--accent-dark);
            font-size: 0.75rem; font-weight: 600; margin-bottom: 12px;
        }

        /* ===== 流程步骤 ===== */
        .step-list { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 30px; counter-reset: step; }
        .step-item {
            background: var(--bg-white); border-radius: var(--radius-md);
            padding: 36px 28px 28px; box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            position: relative; transition: var(--transition);
        }
        .step-item:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
        .step-item::before {
            counter-increment: step; content: counter(step);
            position: absolute; top: -14px; left: 28px;
            width: 36px; height: 36px; border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff; font-weight: 700; font-size: 1rem;
            display: flex; align-items: center; justify-content: center;
            box-shadow: 0 4px 14px rgba(212, 168, 75, 0.30);
        }
        .step-item h4 { font-size: 1.1rem; margin-bottom: 8px; margin-top: 4px; color: var(--primary-dark); }
        .step-item p { font-size: 0.92rem; color: var(--text-muted); line-height: 1.6; }

        /* ===== 平台徽章 ===== */
        .platform-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
        .platform-card {
            background: var(--bg-white); border-radius: var(--radius-md);
            padding: 28px 24px; text-align: center;
            border: 2px solid var(--border-light); transition: var(--transition);
        }
        .platform-card:hover { border-color: var(--accent); box-shadow: var(--shadow-glow); transform: translateY(-3px); }
        .platform-card .plat-icon { font-size: 2.8rem; color: var(--primary-light); margin-bottom: 12px; }
        .platform-card h4 { font-size: 1.1rem; margin-bottom: 4px; }
        .platform-card p { font-size: 0.85rem; color: var(--text-muted); }

        /* ===== 评价/数据 ===== */
        .testimonial-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; }
        .testimonial-card {
            background: var(--bg-white); border-radius: var(--radius-md);
            padding: 28px 24px; box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .testimonial-card:hover { box-shadow: var(--shadow-md); }
        .testimonial-card .stars { color: var(--accent); font-size: 0.95rem; margin-bottom: 14px; }
        .testimonial-card blockquote { font-size: 0.95rem; color: var(--text-dark); line-height: 1.6; margin-bottom: 16px; font-style: italic; }
        .testimonial-card .author { font-weight: 600; font-size: 0.9rem; color: var(--primary-dark); }
        .testimonial-card .role { font-size: 0.8rem; color: var(--text-muted); }

        /* ===== FAQ ===== */
        .faq-grid { 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-accent); }
        .faq-question {
            padding: 18px 24px; font-weight: 600; font-size: 1rem;
            color: var(--primary-dark); cursor: pointer;
            display: flex; justify-content: space-between; align-items: center;
            transition: var(--transition); user-select: none;
        }
        .faq-question i { color: var(--accent); transition: var(--transition); font-size: 0.9rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px; max-height: 0; overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-muted); 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, #0f1428 0%, #1a2a6c 50%, #2a3a7c 100%);
            padding: 80px 0; text-align: center; position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            opacity: 0.08; pointer-events: none;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { color: #fff; font-size: 2.4rem; margin-bottom: 16px; }
        .cta-section p { color: rgba(255, 255, 255, 0.70); max-width: 560px; margin: 0 auto 32px; font-size: 1.05rem; }
        .cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .cta-section .btn-primary { background: linear-gradient(135deg, var(--accent-light), var(--accent)); box-shadow: 0 8px 30px rgba(212, 168, 75, 0.35); }
        .cta-section .btn-primary:hover { box-shadow: 0 12px 40px rgba(212, 168, 75, 0.50); transform: translateY(-3px); }
        .cta-section .btn-outline { border-color: rgba(255, 255, 255, 0.40); color: #fff; }
        .cta-section .btn-outline:hover { border-color: #fff; background: rgba(255, 255, 255, 0.10); }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark); color: rgba(255, 255, 255, 0.70);
            padding: 56px 0 32px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .site-logo { color: #fff; font-size: 1.3rem; margin-bottom: 14px; display: inline-flex; }
        .footer-brand .site-logo .logo-icon { color: var(--accent); }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; margin-top: 12px; max-width: 360px; color: rgba(255, 255, 255, 0.55); }
        .footer-col h5 { color: #fff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a { color: rgba(255, 255, 255, 0.55); font-size: 0.9rem; transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--accent-light); padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px; display: flex; justify-content: space-between;
            flex-wrap: wrap; gap: 12px; font-size: 0.85rem; color: rgba(255, 255, 255, 0.40);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .hero-title { font-size: 2.8rem; }
        }
        @media (max-width: 768px) {
            .nav-toggle { display: block; }
            .nav-list {
                position: fixed; top: var(--nav-height); left: 0; right: 0;
                background: rgba(255, 255, 255, 0.96); backdrop-filter: blur(12px);
                flex-direction: column; padding: 20px 24px; gap: 6px;
                box-shadow: var(--shadow-md); border-bottom: 1px solid var(--border-light);
                transform: translateY(-120%); opacity: 0; pointer-events: none;
                transition: var(--transition);
            }
            .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
            .nav-list a { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); }
            .nav-list a::after { display: none; }
            .nav-cta { width: 100%; margin-left: 0; margin-top: 8px; }
            .nav-cta .btn { width: 100%; justify-content: center; }
            .hero-title { font-size: 2.2rem; }
            .hero-desc { font-size: 1rem; }
            .grid-2, .grid-3, .step-list, .platform-grid, .testimonial-grid { grid-template-columns: 1fr; }
            .section-title { font-size: 1.8rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .hero-stat { gap: 24px; }
            .hero-stat-item strong { font-size: 1.4rem; }
            .section { padding: 56px 0; }
            .cta-section h2 { font-size: 1.8rem; }
        }
        @media (max-width: 520px) {
            .hero-title { font-size: 1.8rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .container { padding: 0 16px; }
            .card { padding: 24px 20px; }
            .step-item { padding: 28px 20px 20px; }
            .platform-card { padding: 20px 16px; }
        }

        /* ===== 工具类 ===== */
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mb-16 { margin-bottom: 16px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-16 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .relative { position: relative; }
        .overflow-hidden { overflow: hidden; }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2340;
            --accent: #c8a96e;
            --accent-light: #e0c99a;
            --accent-dark: #a88a4a;
            --bg-light: #f8f7f4;
            --bg-white: #ffffff;
            --bg-dark: #0f1a2e;
            --text-dark: #1a1a2e;
            --text-body: #3d3d4a;
            --text-light: #7a7a8a;
            --text-white: #f0efe8;
            --border-light: #e8e4de;
            --border-glass: rgba(255, 255, 255, 0.20);
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.07);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.10);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --transition: 0.30s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --nav-height: 72px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            color: var(--text-body);
            background: var(--bg-light);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }

        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Glass Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(15, 26, 46, 0.55);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border-glass);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
            transition: background var(--transition), box-shadow var(--transition);
        }

        .site-header.scrolled {
            background: rgba(15, 26, 46, 0.92);
            box-shadow: 0 6px 32px rgba(0, 0, 0, 0.18);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 0.5px;
            transition: opacity var(--transition);
        }
        .site-logo:hover {
            opacity: 0.85;
            color: var(--text-white);
        }
        .logo-icon {
            font-size: 1.6rem;
            color: var(--accent);
            line-height: 1;
        }
        .logo-icon i {
            vertical-align: middle;
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            margin: 0;
        }
        .nav-list a {
            display: block;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.80);
            font-size: 0.95rem;
            font-weight: 500;
            transition: background var(--transition), color var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #ffffff;
        }
        .nav-list a.active {
            color: var(--accent);
            background: rgba(200, 169, 110, 0.12);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .nav-cta {
            margin-left: 12px;
        }
        .nav-cta .btn {
            padding: 8px 22px;
            font-size: 0.90rem;
            border-radius: 50px;
            font-weight: 600;
        }

        /* Hamburger (mobile) */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 6px;
            z-index: 1001;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2px;
            background: var(--text-white);
            border-radius: 3px;
            transition: transform var(--transition), opacity var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero / Banner ===== */
        .article-hero {
            position: relative;
            padding: 140px 0 80px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center 30%;
            background-repeat: no-repeat;
            min-height: 380px;
            display: flex;
            align-items: center;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 46, 0.82) 0%, rgba(26, 58, 92, 0.70) 100%);
            z-index: 1;
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.25;
            margin-bottom: 16px;
            max-width: 900px;
            margin-left: auto;
            margin-right: auto;
            letter-spacing: -0.3px;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            color: rgba(255, 255, 255, 0.70);
            font-size: 0.95rem;
            margin-top: 8px;
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta i {
            color: var(--accent);
            font-size: 0.85rem;
        }
        .article-category {
            display: inline-block;
            padding: 4px 16px;
            background: var(--accent);
            color: var(--primary-dark);
            border-radius: 50px;
            font-size: 0.80rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 18px;
        }

        /* ===== Main Content ===== */
        .article-main {
            padding: 60px 0 80px;
            background: var(--bg-white);
        }
        .article-body {
            max-width: 800px;
            margin: 0 auto;
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-body);
        }
        .article-body h2,
        .article-body h3,
        .article-body h4 {
            color: var(--primary-dark);
            margin-top: 36px;
            margin-bottom: 16px;
            font-weight: 700;
        }
        .article-body h2 { font-size: 1.65rem; }
        .article-body h3 { font-size: 1.35rem; }
        .article-body p {
            margin-bottom: 20px;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 20px;
            padding-left: 24px;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 32px auto;
            box-shadow: var(--shadow-md);
        }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            padding: 16px 24px;
            margin: 32px 0;
            background: var(--bg-light);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-light);
        }
        .article-body a {
            color: var(--primary-light);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body a:hover {
            color: var(--accent);
        }

        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-not-found h2 {
            font-size: 2rem;
            color: var(--primary-dark);
            margin-bottom: 16px;
        }
        .article-not-found p {
            color: var(--text-light);
            margin-bottom: 24px;
        }
        .article-not-found .btn {
            display: inline-block;
        }

        /* ===== Section General ===== */
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-light {
            background: var(--bg-light);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-padding {
            padding: 80px 0;
        }

        .section-label {
            display: inline-block;
            padding: 4px 18px;
            background: rgba(200, 169, 110, 0.15);
            color: var(--accent);
            border-radius: 50px;
            font-size: 0.80rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-dark);
            margin-bottom: 12px;
            line-height: 1.2;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 640px;
            margin: 0 auto 48px;
            text-align: center;
        }
        .section-dark .section-title {
            color: var(--text-white);
        }
        .section-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.65);
        }

        /* ===== Feature Cards ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: transform var(--transition), box-shadow var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .feature-card .icon-wrap {
            width: 64px;
            height: 64px;
            margin: 0 auto 18px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--accent);
        }
        .feature-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 10px;
        }
        .feature-card p {
            color: var(--text-light);
            font-size: 0.93rem;
            line-height: 1.6;
            margin: 0;
        }

        /* ===== Testimonials ===== */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .testimonial-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .testimonial-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .testimonial-card .stars {
            color: var(--accent);
            font-size: 0.95rem;
            margin-bottom: 12px;
            letter-spacing: 2px;
        }
        .testimonial-card blockquote {
            font-size: 0.98rem;
            line-height: 1.7;
            color: var(--text-body);
            margin: 0 0 16px;
            font-style: italic;
            border: none;
            padding: 0;
        }
        .testimonial-card .author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card .author img {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            object-fit: cover;
            background: var(--border-light);
        }
        .testimonial-card .author strong {
            color: var(--primary-dark);
            font-size: 0.93rem;
        }
        .testimonial-card .author span {
            color: var(--text-light);
            font-size: 0.83rem;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            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: box-shadow var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 24px;
            font-weight: 600;
            color: var(--primary-dark);
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 0.98rem;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: rgba(200, 169, 110, 0.04);
        }
        .faq-question i {
            color: var(--accent);
            transition: transform var(--transition);
            font-size: 0.85rem;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            text-align: center;
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center 40% / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            color: var(--text-white);
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 14px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.70);
            font-size: 1.05rem;
            max-width: 580px;
            margin: 0 auto 32px;
        }
        .cta-section .btn {
            padding: 14px 44px;
            font-size: 1.05rem;
            border-radius: 50px;
            font-weight: 700;
            background: var(--accent);
            color: var(--primary-dark);
            border: none;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .cta-section .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(200, 169, 110, 0.30);
            background: var(--accent-light);
            color: var(--primary-dark);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            line-height: 1.4;
            border: none;
            cursor: pointer;
            transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary-dark);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(200, 169, 110, 0.25);
        }
        .btn-outline-light {
            background: transparent;
            color: var(--text-white);
            border: 1.5px solid rgba(255, 255, 255, 0.30);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.60);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 6px 18px;
            font-size: 0.85rem;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.70);
            padding: 56px 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, 0.06);
        }
        .footer-brand .site-logo {
            font-size: 1.25rem;
            margin-bottom: 14px;
            display: inline-flex;
        }
        .footer-brand p {
            font-size: 0.90rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
            margin-top: 10px;
        }
        .footer-col h5 {
            color: var(--text-white);
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.88rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            font-size: 0.83rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom span:last-child {
            color: rgba(255, 255, 255, 0.25);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-hero h1 {
                font-size: 2.2rem;
            }
            .section-title {
                font-size: 1.9rem;
            }
        }

        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .nav-list {
                position: fixed;
                top: 0;
                right: -100%;
                width: 280px;
                height: 100vh;
                background: rgba(15, 26, 46, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                align-items: flex-start;
                padding: 90px 28px 40px;
                gap: 4px;
                transition: right 0.40s cubic-bezier(0.25, 0.46, 0.45, 0.94);
                box-shadow: -8px 0 40px rgba(0, 0, 0, 0.40);
            }
            .nav-list.open {
                right: 0;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1.05rem;
            }
            .nav-list a.active::after {
                display: none;
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 16px;
                width: 100%;
            }
            .nav-cta .btn {
                width: 100%;
                text-align: center;
                justify-content: center;
            }

            .article-hero {
                padding: 120px 0 60px;
                min-height: 300px;
            }
            .article-hero h1 {
                font-size: 1.8rem;
            }
            .article-meta {
                font-size: 0.85rem;
                gap: 12px;
            }
            .article-main {
                padding: 40px 0 60px;
            }
            .article-body {
                font-size: 0.98rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .testimonial-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .section-padding {
                padding: 60px 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-hero h1 {
                font-size: 1.5rem;
            }
            .article-hero {
                padding: 100px 0 48px;
                min-height: 240px;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .feature-card {
                padding: 24px 20px;
            }
            .testimonial-card {
                padding: 22px 18px;
            }
            .faq-question {
                padding: 14px 18px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 18px 14px;
                font-size: 0.88rem;
            }
            .cta-section {
                padding: 60px 0;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .btn {
                padding: 12px 32px;
                font-size: 0.95rem;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 { margin-top: 8px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mt-4 { margin-top: 40px; }
        .mb-3 { margin-bottom: 24px; }
        .mb-4 { margin-bottom: 40px; }