/* roulang page: index */
:root {
      --primary-dark: #1A1A2E;
      --accent-gold: #D4AF37;
      --accent-red: #E94560;
      --bg-light: #F8F9FC;
      --bg-dark: #0F0F1A;
      --card-white: #FFFFFF;
      --text-main: #1A1A2E;
      --text-secondary: #5A5A7A;
      --text-muted: #8C8CA1;
      --border-light: rgba(255,255,255,0.08);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-lg: 24px;
      --radius-card: 16px;
      --radius-pill: 50px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-family: 'Noto Sans SC', 'PingFang SC', sans-serif;
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    .inter, .stat-number, .btn, .nav-link {
      font-family: 'Inter', 'SF Pro Text', 'Noto Sans SC', sans-serif;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    section {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 48px 0;
      }
      h1 {
        font-size: 28px;
        line-height: 36px;
      }
    }
    /* 浮动导航 Dock */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: 92%;
      max-width: 720px;
      background: rgba(15, 15, 26, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-light);
      border-radius: 40px;
      padding: 10px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 999;
      box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    }
    .logo-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--accent-gold);
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
      margin: 0;
    }
    .nav-links a {
      color: #ddd;
      font-weight: 500;
      font-size: 15px;
      transition: var(--transition);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
      border-bottom-color: var(--accent-gold);
    }
    .nav-cta-btn {
      background: var(--accent-gold);
      color: var(--primary-dark);
      font-weight: 700;
      font-size: 13px;
      padding: 8px 18px;
      border-radius: 40px;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-cta-btn:hover {
      background: var(--accent-red);
      color: white;
      transform: scale(1.02);
    }
    .mobile-menu-icon {
      display: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }
    @media (max-width: 840px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-icon {
        display: block;
      }
      .nav-dock {
        justify-content: space-between;
      }
    }
    /* Hero */
    #hero {
      background-color: var(--bg-dark);
      padding: 120px 0 80px;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
      z-index: 2;
    }
    .hero-text h1 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 800;
      margin-bottom: 16px;
      color: white;
    }
    .hero-text h1 span {
      color: var(--accent-red);
    }
    .hero-sub {
      font-size: 18px;
      color: #ccc;
      margin-bottom: 32px;
      max-width: 450px;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: var(--primary-dark);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 50px;
      display: inline-block;
      transition: var(--transition);
      font-size: 16px;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--accent-red);
      color: white;
      transform: scale(1.03);
    }
    .btn-secondary-link {
      color: var(--accent-gold);
      font-weight: 600;
      margin-left: 20px;
      border-bottom: 1px solid var(--accent-gold);
      transition: var(--transition);
    }
    .btn-secondary-link:hover {
      color: white;
      border-bottom-color: white;
    }
    .hero-visual {
      flex: 1 1 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      min-height: 320px;
      border-radius: 24px;
      position: relative;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      background-color: #2a2a3a;
    }
    .hero-visual::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(135deg, rgba(15,15,26,0.6) 0%, rgba(212,175,55,0.2) 100%);
      border-radius: 24px;
    }
    /* 粒子点缀 */
    .particle {
      position: absolute;
      background: var(--accent-gold);
      border-radius: 50%;
      opacity: 0.2;
      width: 4px;
      height: 4px;
      animation: float 6s infinite ease;
    }
    @keyframes float {
      0% { transform: translateY(0px); opacity: 0.2; }
      50% { transform: translateY(-20px); opacity: 0.5; }
      100% { transform: translateY(0px); opacity: 0.2; }
    }
    /* 区块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary-dark);
    }
    .section-title p {
      color: var(--text-secondary);
      font-size: 16px;
      margin-top: 8px;
    }
    /* 优势卡片 */
    .feature-card {
      background: transparent;
      text-align: center;
      padding: 24px 16px;
      border-bottom: 2px solid var(--accent-gold);
      transition: var(--transition);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }
    /* 服务矩阵卡片 */
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      margin-bottom: 24px;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover), 0 0 0 1px rgba(233,69,96,0.3);
    }
    .service-img {
      height: 180px;
      background-color: #E0E2EA;
      background-size: cover;
      background-position: center;
      border-radius: 16px 16px 0 0;
    }
    .service-body {
      padding: 24px;
    }
    .service-tag {
      background: var(--accent-red);
      color: white;
      font-size: 12px;
      padding: 2px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    /* 数据徽章 */
    #stats {
      background: #F0F1F5;
      border-radius: 24px;
      margin: 0 20px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent-gold);
      line-height: 1.2;
    }
    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.02);
    }
    /* FAQ */
    .accordion-title {
      font-weight: 600;
      background: transparent;
      border: none;
      font-size: 16px;
    }
    .accordion-item.is-active .accordion-title {
      background: #FAFAFE;
    }
    /* CTA */
    #cta {
      background: var(--bg-dark);
      color: white;
      text-align: center;
      border-radius: 0;
    }
    #cta .btn-primary {
      margin-top: 24px;
    }
    .small-note {
      color: var(--accent-red);
      margin-top: 12px;
    }
    /* Footer */
    footer {
      background: var(--primary-dark);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    footer a:hover {
      color: var(--accent-gold);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-text h1 {
        font-size: 28px;
      }
    }
    @media (max-width: 640px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: #aaa;
      transition: var(--transition);
    }
    .social-icons i:hover {
      color: var(--accent-gold);
    }