/* roulang page: index */
:root {
      --bg-deep: #0A0E17;
      --cyan-accent: #00F0FF;
      --pink-accent: #FF3366;
      --white: #FFFFFF;
      --gray-light: #B0B5BD;
      --gray-mid: #8A8F98;
      --card-bg: #1A1F2B;
      --border-subtle: rgba(0,240,255,0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-glow: 0 0 20px rgba(0,240,255,0.3);
      --shadow-pink: 0 0 30px rgba(255,51,102,0.5);
      --transition: all 0.25s ease;
      --container-max: 1280px;
      --section-gap: 120px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Inter", sans-serif;
      background-color: var(--bg-deep);
      color: var(--gray-light);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    h1, h2, h3, h4 {
      color: var(--white);
      font-weight: 700;
    }

    .section {
      padding: var(--section-gap) 0;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      border: none;
      transition: var(--transition);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-size: 16px;
    }

    /* 导航栏 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10,14,23,0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.2);
      z-index: 999;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--cyan-accent);
      white-space: nowrap;
    }
    .logo span {
      color: var(--white);
      font-weight: 400;
    }

    .nav-menu {
      display: flex;
      gap: 36px;
      align-items: center;
    }

    .nav-link {
      color: var(--gray-light);
      font-weight: 500;
      position: relative;
      padding: 6px 0;
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--cyan-accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-accent);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(135deg, #00F0FF 0%, #FF3366 100%);
      color: #0A0E17;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
    }
    .btn-primary:hover {
      box-shadow: var(--shadow-pink);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan-accent);
      color: var(--cyan-accent);
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }

    /* 英雄区 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 50%, rgba(0,240,255,0.08) 0%, transparent 70%);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-title {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.15;
      color: var(--cyan-accent);
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 20px;
      color:var(--gray-mid);
      margin: 24px 0 36px;
    }

    .hero-actions {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .hero-visual {
      background: rgba(26,31,43,0.7);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: 24px;
      padding: 40px 30px;
      position: relative;
    }
    .mock-data {
      font-family: 'Rajdhani', sans-serif;
    }

    /* 指标看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      border-top: 3px solid var(--cyan-accent);
      transition: var(--transition);
    }
    .stat-number {
      font-family: 'Rajdhani', sans-serif;
      font-size: 48px;
      font-weight: 700;
      color: var(--white);
      line-height: 1.2;
    }
    .stat-label {
      color:var(--gray-mid);
      margin-top: 8px;
    }

    /* 服务矩阵 Z型布局 */
    .matrix {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .matrix-row {
      display: grid;
      grid-template-columns: 1fr 320px 320px;
      gap: 24px;
    }
    .matrix-row.reverse {
      grid-template-columns: 320px 320px 1fr;
    }
    .big-card, .small-card {
      background: var(--card-bg);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      transition: var(--transition);
    }
    .big-card {
      padding: 36px;
      display: flex;
      flex-direction: column;
    }
    .small-card {
      padding: 24px;
    }
    .card-icon {
      font-size: 30px;
      color: var(--cyan-accent);
      margin-bottom: 16px;
    }

    /* 结果对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 40px 1fr;
      align-items: center;
    }
    .compare-col {
      background: #1A1F2B;
      padding: 36px;
      border-radius: var(--radius-card);
    }
    .compare-divider {
      width: 4px;
      height: 60px;
      background: var(--cyan-accent);
      margin: 0 auto;
      box-shadow: 0 0 16px var(--cyan-accent);
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--white);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 28px;
      color: var(--gray-light);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* 终极CTA */
    .final-cta {
      background: radial-gradient(circle at center, #FF3366 0%, #0A0E17 80%);
      text-align: center;
    }

    .cta-title {
      font-size: 44px;
      font-weight: 700;
      color: var(--white);
    }

    /* 页脚 */
    .footer {
      background: #05080F;
      border-top: 2px solid var(--cyan-accent);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
    }

    .copyright {
      text-align: center;
      margin-top: 60px;
      padding-top: 20px;
      border-top: 1px solid #1E2330;
      color: var(--gray-mid);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .matrix-row, .matrix-row.reverse {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .container { padding: 0 20px; }
      h1 { font-size: 36px; }
      .compare-wrapper { grid-template-columns: 1fr; }
      .compare-divider { display: none; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .cta-title { font-size: 32px; }
    }