/* roulang page: index */
:root {
      --primary: #0055FF;
      --primary-dark: #0033AA;
      --accent-orange: #FF4D00;
      --accent-green: #00E676;
      --bg-deep: #0A0E17;
      --glass-bg: rgba(255, 255, 255, 0.04);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-bg: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(255, 255, 255, 0.15);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.4);
      --shadow-blue: 0 8px 32px rgba(0, 85, 255, 0.12);
      --shadow-blue-hover: 0 16px 40px rgba(0, 85, 255, 0.25);
      --radius-lg: 16px;
      --radius-md: 8px;
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.3s ease;
    }

    a:hover {
      color: var(--accent-orange);
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 85, 255, 0.15);
      transition: background 0.3s ease;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      padding: 0 24px;
      max-width: 1280px;
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
      box-shadow: 0 0 12px rgba(0, 85, 255, 0.6);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--text-primary);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary);
      transition: width 0.3s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-outline-nav {
      border: 1px solid var(--primary);
      background: transparent;
      color: var(--primary);
      padding: 8px 20px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 14px;
      transition: all 0.3s ease;
      box-shadow: 0 0 10px rgba(0, 85, 255, 0.2);
    }

    .btn-outline-nav:hover {
      background: var(--primary);
      color: white;
      box-shadow: 0 0 20px rgba(0, 85, 255, 0.6);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 26px;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      padding: 160px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      perspective: 1000px;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      letter-spacing: -1.5px;
      line-height: 1.1;
      margin-bottom: 24px;
      background: linear-gradient(to right, var(--primary), #ffffff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 480px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 16px;
      box-shadow: 0 0 20px rgba(0, 85, 255, 0.5);
      cursor: pointer;
      transition: all 0.3s ease;
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0, 85, 255, 0.8);
      transform: translateY(-2px);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
      transition: all 0.3s ease;
      box-shadow: 0 0 12px rgba(0, 85, 255, 0.15);
    }

    .btn-ghost:hover {
      background: var(--primary);
      color: white;
      box-shadow: 0 0 25px rgba(0, 85, 255, 0.5);
    }

    .glass-card-stack {
      position: relative;
      width: 100%;
      max-width: 400px;
    }

    .main-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-blue);
      position: relative;
      z-index: 3;
    }

    .main-card img {
      border-radius: 12px;
      width: 100%;
      height: auto;
    }

    .float-card {
      position: absolute;
      width: 180px;
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 12px;
      z-index: 1;
      opacity: 0.6;
    }

    .float-card-1 {
      top: -30px;
      right: -20px;
    }

    .float-card-2 {
      bottom: -25px;
      left: -20px;
    }

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .section-title::before {
      content: '';
      width: 40px;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
    }

    .section-desc {
      color: var(--text-secondary);
      max-width: 600px;
      margin-bottom: 48px;
    }

    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-blue);
    }

    .highlight-card:nth-child(2) {
      transform: translateY(-12px);
      background: rgba(255,255,255,0.06);
    }

    .highlight-card:hover {
      background: var(--glass-hover-bg);
      border-color: var(--glass-hover-border);
      box-shadow: var(--shadow-blue-hover);
      transform: translateY(-6px);
    }

    .highlight-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .highlight-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 瀑布流服务 */
    .service-waterfall {
      columns: 3;
      column-gap: 24px;
    }

    .service-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: 0.3s;
    }

    .service-item:hover {
      border-color: var(--glass-hover-border);
      box-shadow: var(--shadow-blue-hover);
    }

    .service-item img {
      width: 100%;
      height: auto;
    }

    .service-content {
      padding: 20px;
    }

    /* 对比 */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 24px;
      align-items: center;
    }

    .vs-badge {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      text-shadow: 0 0 15px var(--primary);
    }

    .compare-card {
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-lg);
      padding: 32px;
      backdrop-filter: blur(12px);
    }

    .compare-card.highlight {
      background: rgba(0,85,255,0.08);
      border: 1px solid rgba(0,85,255,0.2);
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-orange);
      text-shadow: 0 0 20px rgba(255,77,0,0.5);
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 16px 24px;
      cursor: pointer;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-band {
      background: rgba(0,85,255,0.05);
      text-align: center;
      padding: 80px 0;
    }

    .btn-cta {
      background: linear-gradient(135deg, var(--accent-orange), #cc3d00);
      color: white;
      padding: 18px 48px;
      border-radius: 50px;
      font-weight: 800;
      font-size: 18px;
      box-shadow: 0 0 30px rgba(255,77,0,0.7);
      animation: pulse 2s infinite;
      border: none;
      display: inline-block;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 20px rgba(255,77,0,0.6); }
      50% { box-shadow: 0 0 45px rgba(255,77,0,0.9); }
      100% { box-shadow: 0 0 20px rgba(255,77,0,0.6); }
    }

    .footer {
      background: #060a10;
      padding: 60px 0 30px;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .hero-section { flex-direction: column; }
      .highlight-grid { grid-template-columns: repeat(2,1fr); }
      .service-waterfall { columns: 2; }
      .comparison-grid { grid-template-columns: 1fr; }
      .vs-badge { display: none; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero h1 { font-size: 36px; }
      .section-title { font-size: 28px; }
      .highlight-grid { grid-template-columns: 1fr; }
      .service-waterfall { columns: 1; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }