/* roulang page: index */
:root {
            --primary-bg: #1A1A1A;
            --accent: #E85D04;
            --accent-hover: #C94D00;
            --secondary: #C9A96E;
            --secondary-hover: #E0C78A;
            --text-body: #E0E0E0;
            --text-muted: #B0B0B0;
            --text-dim: #888888;
            --text-white: #FFFFFF;
            --card-bg: #252525;
            --card-border: #3A3A3A;
            --card-bg-hover: #2A2A2A;
            --dark-panel: #1E1E1E;
            --footer-bg: #111111;
            --divider: #2A2A2A;
            --positive: #2EC4B6;
            --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
            --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.6);
            --radius-card: 8px;
            --radius-btn: 6px;
            --radius-sm: 4px;
            --container-max: 1200px;
            --section-gap: 120px;
            --section-gap-mobile: 80px;
            --font-heading: 'DM Serif Display', 'Noto Serif SC', serif;
            --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-body);
            background-color: var(--primary-bg);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        h1, h2, h3, h4 {
            font-family: var(--font-heading);
            color: var(--text-white);
        }
        h1 {
            font-size: 56px;
            font-weight: 700;
            line-height: 1.1;
        }
        h2 {
            font-size: 40px;
            font-weight: 600;
            line-height: 1.2;
        }
        h3 {
            font-size: 24px;
            font-weight: 600;
            line-height: 1.3;
            color: var(--text-body);
        }
        h4 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-white);
        }
        .section {
            padding: var(--section-gap) 0;
        }
        .text-accent {
            color: var(--accent);
        }
        .text-positive {
            color: var(--positive);
        }
        .text-muted {
            color: var(--text-muted);
        }
        .text-dim {
            color: var(--text-dim);
        }
        .btn {
            display: inline-block;
            font-weight: 600;
            font-size: 16px;
            letter-spacing: 0.5px;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            text-align: center;
            border: none;
            background: transparent;
            line-height: 1.2;
        }
        .btn-primary {
            background-color: var(--accent);
            color: var(--text-white);
        }
        .btn-primary:hover {
            background-color: var(--accent-hover);
            box-shadow: 0 0 12px rgba(232,93,4,0.5);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-ghost {
            color: var(--secondary);
            padding: 14px 24px;
        }
        .btn-ghost:hover {
            color: var(--secondary-hover);
            text-decoration: underline;
        }
        .btn-large {
            padding: 18px 48px;
            font-size: 18px;
        }
        .pulse-animation {
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0% { box-shadow: 0 0 0 0 rgba(232,93,4,0.6); }
            70% { box-shadow: 0 0 0 15px rgba(232,93,4,0); }
            100% { box-shadow: 0 0 0 0 rgba(232,93,4,0); }
        }
        /* 导航 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: all 0.3s ease;
            background: rgba(26,26,26,0.6);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .header.scrolled {
            background: rgba(18,18,18,0.95);
            backdrop-filter: blur(20px);
            box-shadow: 0 2px 20px rgba(0,0,0,0.6);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            font-family: var(--font-heading);
            font-size: 22px;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 1px;
            white-space: nowrap;
        }
        .logo i {
            color: var(--accent);
            margin-right: 6px;
        }
        .nav-links {
            display: flex;
            gap: 32px;
            align-items: center;
        }
        .nav-links a {
            color: var(--text-muted);
            font-weight: 500;
            font-size: 15px;
            transition: color 0.2s;
        }
        .nav-links a:hover {
            color: var(--text-white);
        }
        .nav-cta {
            background: var(--accent);
            color: white !important;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            margin-left: 16px;
        }
        .nav-cta:hover {
            background: var(--accent-hover);
        }
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 28px;
            color: var(--text-white);
            cursor: pointer;
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: rgba(18,18,18,0.98);
            backdrop-filter: blur(20px);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
            z-index: 999;
        }
        .mobile-menu a {
            color: var(--text-white);
            font-size: 22px;
            font-weight: 500;
        }
        .mobile-menu .close-menu {
            position: absolute;
            top: 24px;
            right: 24px;
            font-size: 32px;
        }
        /* Hero */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at center, rgba(26,26,26,0.3) 0%, #1A1A1A 70%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .hero h1 {
            text-shadow: 0 2px 10px rgba(0,0,0,0.8);
            margin-bottom: 24px;
        }
        .hero .subtitle {
            font-size: 20px;
            color: var(--text-muted);
            margin-bottom: 40px;
            max-width: 600px;
        }
        .hero-actions {
            display: flex;
            gap: 24px;
            align-items: center;
            flex-wrap: wrap;
        }
        /* 粒子背景模拟 */
        .particles {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            overflow: hidden;
            z-index: 1;
        }
        .particle {
            position: absolute;
            background: rgba(201,169,110,0.2);
            border-radius: 50%;
            animation: float 6s infinite ease-in-out;
        }
        @keyframes float {
            0% { transform: translateY(0px) scale(1); opacity: 0.2; }
            50% { transform: translateY(-30px) scale(1.3); opacity: 0.5; }
            100% { transform: translateY(0px) scale(1); opacity: 0.2; }
        }
        /* 核心价值 */
        .value-list {
            display: flex;
            flex-direction: column;
            gap: 48px;
        }
        .value-item {
            display: flex;
            align-items: flex-start;
            gap: 32px;
        }
        .value-num {
            font-size: 64px;
            font-weight: 700;
            color: var(--secondary);
            opacity: 0.3;
            line-height: 1;
            font-family: var(--font-heading);
            min-width: 80px;
        }
        .value-text h3 {
            margin-bottom: 8px;
        }
        /* 功能矩阵 */
        .feature-row {
            display: flex;
            align-items: center;
            gap: 60px;
            margin-bottom: 80px;
        }
        .feature-row.reverse {
            flex-direction: row-reverse;
        }
        .feature-img {
            flex: 1;
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--card-border);
        }
        .feature-img img {
            width: 100%;
            height: auto;
        }
        .feature-text {
            flex: 1;
        }
        .feature-text h3 {
            margin-bottom: 12px;
        }
        .data-point {
            font-size: 28px;
            font-weight: 700;
            color: var(--accent);
            margin-top: 16px;
        }
        .divider-line {
            height: 1px;
            background: var(--divider);
            margin: 80px 0;
        }
        /* 场景卡片 */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .scene-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-card);
            padding: 32px;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }
        .scene-card:hover {
            border-color: var(--accent);
            background: var(--card-bg-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }
        .scene-icon {
            font-size: 32px;
            color: var(--accent);
            margin-bottom: 16px;
        }
        /* 案例 */
        .cases-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        .case-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-card);
            padding: 32px;
        }
        .case-reward {
            font-size: 32px;
            font-weight: 700;
            color: var(--positive);
        }
        .stats-bar {
            background: var(--dark-panel);
            border-radius: var(--radius-card);
            padding: 40px;
            display: flex;
            justify-content: space-around;
            margin-top: 48px;
            text-align: center;
        }
        .stat-item .stat-num {
            font-size: 36px;
            font-weight: 700;
            color: var(--accent);
        }
        /* FAQ */
        .faq-list {
            max-width: 720px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
        }
        .faq-question {
            padding: 20px;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            transition: color 0.2s;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            background: var(--dark-panel);
            padding: 0 20px;
            color: var(--text-muted);
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 20px;
        }
        .faq-icon {
            transition: transform 0.3s;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }
        /* 终极CTA */
        .cta-full {
            background: #151515;
            text-align: center;
        }
        /* 页脚 */
        .footer {
            background: var(--footer-bg);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-bottom {
            border-top: 1px solid var(--divider);
            padding: 20px 0;
            font-size: 12px;
            color: #666;
            text-align: center;
        }
        @media (max-width: 1024px) {
            h1 { font-size: 44px; }
            h2 { font-size: 36px; }
            .cards-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .menu-toggle { display: block; }
            h1 { font-size: 32px; }
            h2 { font-size: 28px; }
            .hero-content { text-align: center; }
            .hero-actions { justify-content: center; }
            .feature-row, .feature-row.reverse { flex-direction: column; }
            .cards-grid { grid-template-columns: 1fr; }
            .cases-grid { grid-template-columns: 1fr; }
            .stats-bar { flex-direction: column; gap: 24px; }
            .footer-grid { grid-template-columns: 1fr; }
            .value-item { flex-direction: column; gap: 16px; }
        }