/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --card-bg: #111633;
      --cyan: #00F0FF;
      --red: #FF4655;
      --gold: #FFD700;
      --text-primary: #E8ECFF;
      --text-muted: #8890B5;
      --border-dim: rgba(0, 240, 255, 0.15);
      --border-glow: #00F0FF;
      --shadow-cyan: 0 0 18px rgba(0, 240, 255, 0.6);
      --radius-card: 12px;
      --radius-btn: 6px;
      --font-mono: 'Orbitron', 'Rajdhani', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

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

    body {
      background-color: var(--deep-blue);
      color: var(--text-primary);
      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 32px;
    }

    h1, h2, h3, .mono {
      font-family: var(--font-sans);
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: 2px;
      line-height: 1.2;
    }

    h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: 1px;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    a:hover {
      color: var(--cyan);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      background-clip: padding-box;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-family: var(--font-mono);
      font-size: 24px;
      font-weight: 700;
      color: var(--cyan);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      color: var(--gold);
      font-size: 20px;
    }

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

    .nav-menu a {
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 8px 0;
      font-size: 16px;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.3s ease;
    }

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

    .btn-primary {
      background: var(--cyan);
      color: #0A0E27;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-cyan);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: var(--cyan);
      color: #0A0E27;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 2px;
      background: var(--cyan);
      transition: 0.3s;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      margin-top: 0;
      padding-top: 72px;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 30%, transparent 20%, #0A0E27 95%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      margin: 0 auto;
    }

    .hero h1 {
      color: white;
      text-shadow: 0 0 25px var(--cyan);
    }

    .hero .subtitle {
      font-size: 20px;
      color: var(--text-muted);
      margin: 20px 0 32px;
      font-weight: 400;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

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

    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      color: white;
      display: inline-block;
      border-bottom: 2px solid var(--cyan);
      padding-bottom: 8px;
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .stat-card {
      background: var(--card-bg);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      transition: transform 0.25s, border-color 0.2s;
    }

    .stat-card:hover {
      transform: translateY(-5px);
      border-color: var(--cyan);
      box-shadow: 0 0 24px rgba(0, 240, 255, 0.2);
    }

    .stat-value {
      font-family: var(--font-mono);
      font-size: 44px;
      font-weight: 700;
      color: var(--cyan);
    }

    .stat-label {
      color: var(--text-muted);
      margin: 12px 0;
    }

    .trend-bar {
      height: 6px;
      background: linear-gradient(to right, var(--red), var(--cyan));
      border-radius: 4px;
      width: 100%;
      margin-top: 16px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      padding: 40px 24px;
      transition: all 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: var(--cyan);
      box-shadow: 0 12px 28px rgba(0, 240, 255, 0.15);
    }

    .service-icon {
      font-size: 38px;
      color: var(--cyan);
      margin-bottom: 20px;
    }

    /* 性能对比 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 30px;
    }

    .compare-col {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      border: 1px solid var(--border-dim);
    }

    .compare-col.bad {
      border-left: 4px solid var(--red);
    }
    .compare-col.good {
      border-left: 4px solid var(--cyan);
    }

    .vs-divider {
      font-family: var(--font-mono);
      font-size: 32px;
      color: var(--gold);
      font-weight: 800;
    }

    .metric-row {
      display: flex;
      justify-content: space-between;
      margin: 16px 0;
      font-size: 18px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      background: var(--card-bg);
      transition: 0.2s;
    }

    .faq-question {
      width: 100%;
      background: none;
      color: var(--text-primary);
      padding: 20px 28px;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding: 0 28px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.active {
      border-color: var(--cyan);
    }

    /* CTA 表单 */
    .contact-form {
      max-width: 560px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-form input,
    .contact-form textarea {
      background: #0A0E27;
      border: 1px solid var(--text-muted);
      border-radius: var(--radius-btn);
      padding: 14px 18px;
      color: white;
      font-size: 16px;
      outline: none;
      transition: 0.2s;
    }

    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: var(--cyan);
      box-shadow: 0 0 12px var(--cyan);
    }

    /* 页脚 */
    .footer {
      background: #070A1A;
      padding: 40px 0;
      text-align: center;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      h1 { font-size: 40px; }
    }

    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-menu {
        position: fixed;
        top: 72px;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(10,14,39,0.96);
        flex-direction: column;
        padding: 40px;
        gap: 32px;
        transition: right 0.4s ease;
        backdrop-filter: blur(20px);
      }
      .nav-menu.open { right: 0; }
      .dashboard-grid,
      .services-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .vs-divider { transform: rotate(90deg); }
      h1 { font-size: 32px; }
      .hero-buttons { flex-direction: column; align-items: center; }
    }