/* roulang page: index */
:root {
      --primary-purple: #4A3AFF;
      --accent-cyan: #00E5BF;
      --bg-deep: #0B1A2E;
      --bg-darker: #070D1A;
      --text-white: #F0F4FF;
      --text-gray: #B0C0D0;
      --card-bg: rgba(255,255,255,0.06);
      --card-border: rgba(255,255,255,0.12);
      --glass-bg: rgba(10,16,34,0.5);
      --border-light: rgba(255,255,255,0.08);
      --shadow-purple: 0 8px 32px rgba(74,58,255,0.25);
      --shadow-cyan: 0 0 20px rgba(0,229,191,0.6);
      --radius-card: 16px;
      --radius-btn: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: radial-gradient(circle at 20% 10%, #0B1A2E, #0A1022);
      color: var(--text-gray);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      position: relative;
    }
    body::before {
      content: "";
      position: fixed;
      top:0;left:0;width:100%;height:100%;
      background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 2;
    }
    /* 导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10,16,34,0.65);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      height: 64px;
      display: flex;
      align-items: center;
      transition: background 0.3s ease;
    }
    .glass-nav.scrolled {
      background: rgba(10,16,34,0.96);
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
    }
    .nav-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-cyan);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 26px;
      color: var(--accent-cyan);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: #D0D8EA;
      font-weight: 500;
      font-size: 15px;
      text-decoration: none;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .btn-nav {
      background: var(--accent-cyan);
      color: #0B1A2E;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: 8px;
      font-size: 14px;
      text-decoration: none;
      transition: box-shadow 0.2s, background 0.2s;
    }
    .btn-nav:hover {
      box-shadow: var(--shadow-cyan);
      background: #00f0c8;
      color: #0B1A2E;
    }
    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-white);
      font-size: 24px;
    }
    @media (max-width: 840px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(7,13,26,0.98);
        flex-direction: column;
        padding: 20px 24px;
        gap: 18px;
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
    }
    /* Hero */
    #hero {
      padding: 140px 0 100px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(74,58,255,0.25) 0%, transparent 50%),
                  radial-gradient(circle at 70% 60%, rgba(0,229,191,0.15) 0%, transparent 55%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 3;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--text-white);
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 18px;
      color: #B0C0D0;
      max-width: 640px;
      margin: 0 auto 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: #0B1A2E;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 8px;
      text-decoration: none;
      transition: 0.25s;
      border: none;
      display: inline-block;
    }
    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(0,229,191,0.7);
      background: #00f0c8;
      color: #0B1A2E;
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid rgba(255,255,255,0.3);
      background: transparent;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 8px;
      text-decoration: none;
      transition: 0.25s;
    }
    .btn-outline:hover {
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
      background: rgba(0,229,191,0.08);
    }
    @media (max-width: 640px) {
      h1 { font-size: 32px; }
      .hero-sub { font-size: 16px; }
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .section-title::before {
      content: "";
      display: inline-block;
      width: 30px;
      height: 2px;
      background: var(--accent-cyan);
    }
    .section-sub {
      color: #B0C0D0;
      margin-bottom: 48px;
    }
    /* 卡片通用 */
    .glass-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 16px;
      padding: 28px;
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      box-shadow: 0 12px 28px rgba(74,58,255,0.25);
      transform: translateY(-5px);
      border-color: rgba(255,255,255,0.2);
    }
    .service-icon {
      font-size: 42px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-white);
      margin-bottom: 10px;
    }
    .tag {
      background: rgba(74,58,255,0.2);
      color: #c7b9ff;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
    }
    /* 数据指标 */
    .metric-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-cyan);
      line-height: 1.1;
    }
    /* 图片占位 */
    .img-placeholder {
      background: #1A2540;
      border-radius: 12px;
      min-height: 200px;
      background-size: cover;
      background-position: center;
    }
    /* FAQ */
    .accordion-title {
      background: rgba(255,255,255,0.03);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 18px 20px;
      font-weight: 600;
      color: var(--text-white);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      padding: 0 20px 18px;
      color: #B0C0D0;
    }
    /* 表单 */
    input, textarea {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 8px;
      color: white;
      padding: 12px;
      width: 100%;
      margin-bottom: 16px;
      outline: none;
    }
    input:focus, textarea:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 8px rgba(0,229,191,0.4);
    }
    footer {
      background: #070D1A;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(0,229,191,0.3);
    }
    @media (max-width: 640px) {
      section { padding: 70px 0; }
      .grid-x { gap: 20px; }
    }