/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-glow: #9B4FFF;
      --accent: #00F0FF;
      --accent-soft: rgba(0, 240, 255, 0.15);
      --bg-deep: #0F0F1A;
      --surface: rgba(20, 20, 40, 0.85);
      --surface-card: rgba(255, 255, 255, 0.03);
      --border-dim: rgba(123, 47, 247, 0.2);
      --border-glow: rgba(0, 240, 255, 0.4);
      --text-primary: #FFFFFF;
      --text-body: #B0B0C0;
      --text-muted: #707080;
      --radius: 12px;
      --radius-btn: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --transition: 0.25s ease;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: var(--font-sans);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    #main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      backdrop-filter: blur(0px);
      transition: background 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s;
      padding: 16px 0;
    }

    #main-nav.scrolled {
      background: rgba(15, 15, 26, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--text-primary);
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--primary);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 1px;
      color: #fff;
    }

    .logo-domain {
      font-size: 0.7rem;
      color: var(--text-muted);
      margin-left: 4px;
      font-weight: 400;
    }

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

    .nav-links a {
      color: var(--text-primary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

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

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: #fff;
      transition: 0.2s;
      display: block;
    }

    /* 移动菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(15, 15, 26, 0.97);
      backdrop-filter: blur(15px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      transform: translateX(100%);
      transition: transform 0.35s ease;
      z-index: 999;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: #fff;
      font-size: 1.5rem;
      text-decoration: none;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      width: 200px;
      text-align: center;
      padding-bottom: 8px;
    }

    /* Hero */
    #hero {
      height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: var(--bg-deep);
      overflow: hidden;
    }

    .circuit-bg {
      position: absolute;
      inset: 0;
      pointer-events: none;
    }

    .circuit-line {
      position: absolute;
      background: rgba(0, 240, 255, 0.08);
      height: 1px;
      width: 120%;
      left: -10%;
      animation: drift 8s infinite alternate;
    }

    @keyframes drift {
      0% { transform: translateX(0); }
      100% { transform: translateX(20px); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }

    h1 {
      font-size: 3rem;
      font-weight: 700;
      color: #fff;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 36px;
    }

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

    .btn-primary {
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, box-shadow 0.2s;
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-glow);
      box-shadow: 0 0 18px var(--primary);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
      text-decoration: none;
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
    }

    /* 区块通用 */
    section {
      padding: 100px 0;
    }

    h2 {
      font-size: 2rem;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 40px;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
    }

    /* 指标看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: rgba(123, 47, 247, 0.08);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius);
      padding: 24px 16px;
      text-align: center;
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--surface-card);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius);
      padding: 28px 20px;
      transition: var(--transition);
    }

    .service-card:hover {
      border-color: var(--accent);
      transform: translateY(-4px);
      box-shadow: 0 0 15px rgba(123, 47, 247, 0.3);
    }

    /* 对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .compare-card {
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius);
      padding: 32px;
    }

    .compare-card.highlight {
      border: 1px solid var(--primary);
      box-shadow: 0 0 20px rgba(123, 47, 247, 0.4);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 18px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      color: #fff;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* 表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    input, select {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--radius-btn);
      padding: 14px;
      color: #fff;
      width: 100%;
    }

    /* 页脚 */
    footer {
      background: #0A0A14;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      h1 { font-size: 2.2rem; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-row { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      section { padding: 60px 0; }
    }