/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --deep-purple: #1A0A2E;
      --star-gold: #F0B90B;
      --aurora-cyan: #00E5FF;
      --bg-deep: #0D0B1E;
      --card-bg: rgba(26, 10, 46, 0.7);
      --text-primary: #F5F0FF;
      --text-secondary: #9B8EC4;
      --border-dim: rgba(240, 185, 11, 0.12);
      --shadow-card: 0 4px 24px rgba(0, 229, 255, 0.08);
      --shadow-hover: 0 12px 36px rgba(240, 185, 11, 0.2);
      --radius-xl: 20px;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --max-width: 1280px;
      --section-padding: 100px;
      --card-gap: 24px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, border-color 0.2s ease;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(13, 11, 30, 0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(240, 185, 11, 0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--star-gold);
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--aurora-cyan);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
      list-style: none;
    }
    .nav-menu a {
      font-weight: 500;
      font-size: 1rem;
      color: var(--text-primary);
      position: relative;
      padding: 6px 0;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--aurora-cyan);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover {
      color: var(--aurora-cyan);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: transparent;
      border: 1px solid var(--star-gold);
      color: var(--star-gold);
      padding: 8px 22px;
      border-radius: 30px;
      font-weight: 600;
      transition: all 0.3s;
      background: rgba(240, 185, 11, 0.05);
    }
    .nav-cta:hover {
      background: var(--star-gold);
      color: #0D0B1E;
      box-shadow: 0 0 18px rgba(240, 185, 11, 0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: rgba(10, 5, 22, 0.95);
        backdrop-filter: blur(24px);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        transition: right 0.4s ease;
        z-index: 999;
      }
      .nav-menu.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .nav-cta {
        margin-top: 20px;
      }
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(0, 229, 255, 0.08) 0%, var(--deep-purple) 90%);
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .stars {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(1px 1px at 20% 30%, #fff, transparent),
                  radial-gradient(1px 1px at 60% 70%, #fff, transparent),
                  radial-gradient(2px 2px at 80% 20%, #F0B90B, transparent);
      background-size: 180px 180px, 250px 250px, 200px 200px;
      opacity: 0.7;
      animation: drift 30s linear infinite;
    }
    @keyframes drift {
      0% { transform: translateY(0); }
      100% { transform: translateY(-20px); }
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      font-size: clamp(2.2rem, 6vw, 3.6rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
      color: var(--text-primary);
    }
    .hero-highlight {
      color: var(--star-gold);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      max-width: 580px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      gap: 24px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--star-gold);
      color: #0D0B1E;
      font-weight: 700;
      padding: 14px 40px;
      border-radius: 40px;
      font-size: 1.1rem;
      border: none;
      cursor: pointer;
      transition: all 0.3s;
      box-shadow: 0 4px 20px rgba(240, 185, 11, 0.3);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: #ffd54f;
      box-shadow: 0 8px 32px rgba(240, 185, 11, 0.6);
      transform: translateY(-2px);
    }
    .btn-ghost {
      color: var(--aurora-cyan);
      font-weight: 600;
      border-bottom: 2px solid var(--aurora-cyan);
      padding-bottom: 4px;
    }
    .hero-visual {
      flex: 0.9;
      display: flex;
      justify-content: center;
    }
    .orbit-ring {
      width: 280px;
      height: 280px;
      border: 2px dashed rgba(0, 229, 255, 0.25);
      border-radius: 50%;
      position: relative;
      animation: spin 25s linear infinite;
    }
    @keyframes spin { 100% { transform: rotate(360deg); } }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-actions {
        justify-content: center;
      }
    }
    /* 通用区块 */
    section {
      padding: var(--section-padding) 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-sub {
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
    }
    /* 指标看板 */
    #dashboard .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--card-gap);
    }
    .stat-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      border: 1px solid var(--border-dim);
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .stat-card:hover {
      border-color: var(--star-gold);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .stat-number {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--star-gold);
      margin-bottom: 8px;
    }
    .stat-icon {
      color: var(--aurora-cyan);
      font-size: 1.8rem;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      #dashboard .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* 服务矩阵 */
    #services .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--card-gap);
    }
    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      border: 1px solid rgba(240,185,11,0.08);
      transition: all 0.3s;
    }
    .service-card:hover {
      border-color: var(--star-gold);
      box-shadow: 0 8px 40px rgba(240,185,11,0.15);
      transform: translateY(-6px);
    }
    .service-icon {
      width: 56px;
      height: 56px;
      background: rgba(0,229,255,0.1);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--aurora-cyan);
      font-size: 2rem;
      margin-bottom: 20px;
    }
    @media (max-width: 1024px) {
      #services .service-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      #services .service-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比表 */
    .compare-table {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-xl);
      overflow: hidden;
    }
    .compare-row {
      display: flex;
      border-bottom: 1px solid rgba(240,185,11,0.08);
    }
    .compare-row:last-child { border: none; }
    .compare-cell {
      flex: 1;
      padding: 20px 24px;
    }
    .highlight-row {
      background: rgba(0,229,255,0.06);
    }
    .compare-header {
      font-weight: 700;
      color: var(--star-gold);
    }
    @media (max-width: 640px) {
      .compare-row {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-item {
      border-left: 4px solid var(--aurora-cyan);
      background: rgba(26,10,46,0.5);
      margin-bottom: 16px;
      border-radius: 0 12px 12px 0;
      padding: 18px 24px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-item.active {
      border-left-color: var(--star-gold);
      background: rgba(26,10,46,0.8);
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      margin-top: 12px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    #cta {
      background: var(--deep-purple);
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 520px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-input {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(240,185,11,0.25);
      padding: 14px 20px;
      border-radius: 40px;
      color: white;
      flex: 1;
      min-width: 200px;
    }
    .cta-input:focus {
      border-color: var(--aurora-cyan);
      box-shadow: 0 0 16px rgba(0,229,255,0.3);
    }
    /* 页脚 */
    #footer {
      background: #0A0718;
      padding: 60px 0 30px;
      color: var(--text-secondary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }