/* roulang page: index */
:root {
      --primary-deep: #0B1E33;
      --primary-dark: #1A2F4A;
      --accent-gold: #F5A623;
      --accent-gold-hover: #E0950F;
      --accent-teal: #00D2A0;
      --bg-light: #F7F8FA;
      --bg-white: #FFFFFF;
      --text-dark: #1E293B;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-full: 50px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
      --header-height: 80px;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: var(--transition);
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(11, 30, 51, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s;
    }
    .header.scrolled {
      background: rgba(11, 30, 51, 0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: var(--header-height);
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--accent-gold);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 16px;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-gold);
    }
    .btn-download-nav {
      background: var(--accent-gold);
      color: #0B1E33;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-full);
      font-size: 15px;
      letter-spacing: 0.5px;
      box-shadow: 0 4px 14px rgba(245,166,35,0.3);
    }
    .btn-download-nav:hover {
      background: var(--accent-gold-hover);
      transform: scale(1.03);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11,30,51,0.96);
      backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255,255,255,0.1);
      padding: 8px 16px;
      z-index: 99;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-bottom-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: rgba(255,255,255,0.7);
      font-size: 12px;
      gap: 4px;
      font-weight: 500;
    }
    .mobile-bottom-nav a i {
      font-size: 20px;
    }
    .mobile-bottom-nav .center-download {
      background: var(--accent-gold);
      color: #0B1E33;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-top: -20px;
      box-shadow: 0 6px 18px rgba(245,166,35,0.5);
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B1E33 0%, #1A2F4A 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: var(--header-height);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-pattern {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      pointer-events: none;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      font-size: 52px;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-content h1 span {
      color: var(--accent-gold);
    }
    .hero-subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: #0B1E33;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      font-size: 16px;
      letter-spacing: 0.5px;
      box-shadow: 0 8px 20px rgba(245,166,35,0.4);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--accent-gold-hover);
      transform: translateY(-2px) scale(1.02);
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      background: transparent;
    }
    .btn-outline:hover {
      background: white;
      color: #0B1E33;
    }
    .hero-mockup {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .phone-frame {
      background: #111;
      border-radius: 36px;
      padding: 12px;
      box-shadow: 0 30px 50px rgba(0,0,0,0.5);
      max-width: 280px;
    }
    .phone-screen {
      background: #f0f2f5;
      border-radius: 24px;
      overflow: hidden;
      aspect-ratio: 9/19;
    }
    .phone-screen img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
      font-size: 17px;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      text-align: center;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }
    .service-icon {
      font-size: 40px;
      color: var(--accent-teal);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-muted);
      font-size: 15px;
    }
    .card-img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }
    /* 优势数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-item .stat-number {
      font-size: 44px;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
      margin-top: 8px;
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .case-img {
      width: 45%;
      object-fit: cover;
    }
    .case-info {
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-tag {
      color: var(--accent-teal);
      font-weight: 600;
      font-size: 14px;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 24px;
      flex-wrap: wrap;
    }
    .step {
      flex: 1;
      text-align: center;
      position: relative;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-gold);
      color: #0B1E33;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 24px;
      margin: 0 auto 16px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 16px;
      font-weight: 600;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: #EFF6FF;
      text-align: center;
    }
    .download-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 40px;
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links, .btn-download-nav {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .header {
        background: rgba(11,30,51,0.98);
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .services-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
      .case-card {
        flex-direction: column;
      }
      .case-img {
        width: 100%;
        height: 180px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      section {
        padding: 70px 0;
      }
    }