/* roulang page: index */
/* 设计系统变量与基础重置 */
    :root {
      --primary-cyan: #00F0FF;
      --primary-blue: #0088FF;
      --accent-red: #FF3366;
      --bg-deep: #0A0E27;
      --bg-darker: #050816;
      --card-glass: rgba(26, 31, 58, 0.6);
      --glass-border: rgba(0, 240, 255, 0.15);
      --text-white: #FFFFFF;
      --text-muted: #B0B8D0;
      --border-sub: #2A2F4A;
      --font-chinese: "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "DIN Alternate", sans-serif;
      --container-max: 1200px;
      --radius-card: 16px;
      --radius-button: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --spacing-section: 100px;
    }

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

    body {
      font-family: var(--font-chinese);
      background: radial-gradient(circle at 20% 20%, #0f1433, #050816);
      color: var(--text-muted);
      line-height: 1.6;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      background-attachment: fixed;
      position: relative;
    }

    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 导航系统 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 100;
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo a {
      display: flex;
      align-items: center;
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
    }

    .logo i {
      color: var(--primary-cyan);
      margin-right: 8px;
      font-size: 2rem;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      color: var(--text-muted);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-cyan);
      box-shadow: 0 0 12px var(--primary-cyan);
      transition: width 0.3s;
    }

    .nav-link:hover, .nav-link:focus {
      color: var(--primary-cyan);
    }
    .nav-link:hover::after, .nav-link:focus::after {
      width: 100%;
    }

    .btn-nav-cta {
      background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
      border: none;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      color: #0A0E27;
      transition: all 0.3s;
      margin-left: 8px;
      font-size: 0.95rem;
    }

    .btn-nav-cta:hover {
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.7);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary-cyan);
      margin: 4px 0;
      transition: 0.3s;
    }

    /* 移动端全屏菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(5, 8, 22, 0.98);
      backdrop-filter: blur(30px);
      z-index: 99;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      font-size: 1.8rem;
      margin: 16px 0;
      color: white;
      font-weight: 500;
    }

    /* HERO区域 */
    .hero-section {
      padding: 160px 0 80px;
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      background: linear-gradient(135deg, #00F0FF, #0088FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 24px;
    }
    .hero-desc {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 560px;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0088FF);
      border: none;
      color: #0A0E27;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 700;
      transition: 0.3s;
      box-shadow: 0 4px 20px rgba(0,240,255,0.3);
    }
    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(0,240,255,0.7);
      transform: translateY(-3px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid #00F0FF;
      color: #00F0FF;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
    }

    .hero-right {
      flex: 1;
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: flex-end;
    }
    .metric-card {
      background: rgba(16, 20, 40, 0.7);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(0,240,255,0.25);
      border-radius: 16px;
      padding: 18px 20px;
      width: 160px;
      text-align: center;
    }
    .metric-num {
      font-family: 'Inter', sans-serif;
      font-size: 2rem;
      font-weight: 700;
      color: #00F0FF;
    }
    
    /* 通用区块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      color: white;
      margin-bottom: 48px;
      position: relative;
      padding-left: 24px;
    }
    .section-title::before {
      content: '';
      position: absolute;
      left: 00;
      top: 4px;
      width: 4px;
      height: 30px;
      background: #00F0FF;
      box-shadow: 0 0 12px #00F0FF;
    }

    .data-grid, .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .glass-card {
      background: var(--card-glass);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .glass-card:hover {
      border-color: rgba(0,240,255,0.4);
      transform: translateY(-4px);
      box-shadow: 0 16px 40px rgba(0,0,0,0.5);
    }
    
    .service-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .service-item {
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }
    .service-icon {
      width: 56px; height: 56px;
      background: rgba(0,240,255,0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size:xx-large;
      color: #00F0FF;
    }
    .compare-container {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .vs-badge {
      font-size: 2rem;
      font-weight: 800;
      color: #FF3366;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }
    
    @media (max-width: 1024px) {
      .data-grid, .service-grid { grid-template-columns: 1fr 1fr; }
      .hero-section { flex-direction: column; }
      .hero-right { justify-content: center; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .data-grid, .service-grid, .faq-grid, .footer-grid { grid-template-columns: 1fr; }
      .compare-container { flex-direction: column; }
      .hero-title { font-size: 2rem; }
      .section-title { font-size: 1.6rem; }
      .container { padding: 0 16px; }
      .hero-section { padding: 120px 0 40px; }
    }

    .cta-form-card {
      max-width: 680px;
      background: var(--card-glass);
      backdrop-filter: blur(15px);
      padding: 40px;
      border-radius: 24px;
    }
    input, textarea {
      width: 100%;
      padding: 12px 16px;
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: 8px;
      color: white;
      margin-bottom: 16px;
    }
    input:focus { border-color: #00F0FF; outline: none; box-shadow: 0 0 6px #00f0ff; }
    .btn-submit {
      background: linear-gradient(135deg, #FF3366, #FF6633);
      border: none; padding: 16px;
      font-weight: 700; border-radius: 8px;
      color: white; cursor: pointer;
    }
    footer { border-top: 1px solid #00F0FF40; margin-top: 60px;}