/* roulang page: index */
:root {
      --deep-space: #0B0E21;
      --electric-cyan: #00E5FF;
      --cool-purple: #7C4DFF;
      --warm-orange: #FF6D3F;
      --text-primary: #E0E6FF;
      --text-secondary: #B0B8E0;
      --text-muted: #7B85B0;
      --card-bg: rgba(15, 20, 45, 0.7);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-highlight: rgba(255, 255, 255, 0.04);
      --radius-card: 20px;
      --radius-btn: 40px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --spacing-section: 120px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--deep-space);
    }

    body {
      font-family: var(--font-body);
      background: var(--deep-space);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -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, background 0.2s ease;
    }

    button, input, textarea {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
      width: 100%;
    }

    /* 桌面导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 14, 33, 0.05);
      backdrop-filter: blur(12px);
      transition: background 0.3s ease, box-shadow 0.3s ease;
      padding: 16px 0;
    }

    .desktop-nav.scrolled {
      background: rgba(11, 14, 33, 0.92);
      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 32px;
    }

    .logo {
      font-family: var(--font-heading);
      font-size: 28px;
      font-weight: 700;
      color: #fff;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #fff 0%, #B0B8E0 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

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

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-primary);
      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(--electric-cyan);
      transition: width 0.25s ease;
    }

    .nav-links a:hover {
      color: var(--electric-cyan);
    }

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

    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 48px);
      max-width: 420px;
      background: rgba(15, 20, 45, 0.88);
      backdrop-filter: blur(28px);
      border-radius: 60px;
      padding: 8px 18px;
      z-index: 1100;
      box-shadow: 0 8px 30px rgba(0,0,0,0.7);
      border: 1px solid rgba(255,255,255,0.1);
      display: flex;
      justify-content: space-around;
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      font-size: 12px;
      font-weight: 500;
      padding: 8px 14px;
      border-radius: 40px;
      transition: all 0.25s ease;
      gap: 4px;
      background: transparent;
    }

    .mobile-nav-item i {
      font-size: 18px;
      color: inherit;
    }

    .mobile-nav-item.active {
      background: var(--electric-cyan);
      color: var(--deep-space);
      font-weight: 600;
    }

    /* 各板块通用 */
    section {
      padding: var(--spacing-section) 0;
      position: relative;
    }

    h1 {
      font-family: var(--font-heading);
      font-size: 52px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-family: var(--font-heading);
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 48px;
      color: #fff;
    }

    h3 {
      font-family: var(--font-heading);
      font-size: 20px;
      font-weight: 600;
    }

    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, border-color 0.3s ease;
    }

    .btn-primary {
      background: var(--electric-cyan);
      color: var(--deep-space);
      font-weight: 600;
      font-size: 16px;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      display: inline-block;
      transition: all 0.3s ease;
      letter-spacing: 0.3px;
      box-shadow: 0 0 12px rgba(0,229,255,0.3);
    }

    .btn-primary:hover {
      box-shadow: 0 0 28px rgba(0,229,255,0.7);
      transform: scale(1.04);
      background: #33EAFF;
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      font-weight: 600;
      font-size: 15px;
      padding: 12px 28px;
      border-radius: 40px;
      transition: 0.3s;
    }

    .btn-secondary:hover {
      background: rgba(0,229,255,0.1);
      border-color: #33EAFF;
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      background: radial-gradient(circle at 20% 30%, rgba(0,229,255,0.06) 0%, transparent 50%);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      margin-bottom: 24px;
      color: #fff;
    }

    .hero-subtitle {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      font-weight: 400;
    }

    .micro-stats {
      display: flex;
      gap: 32px;
      margin-top: 48px;
    }

    .micro-stat strong {
      font-size: 28px;
      color: var(--warm-orange);
      font-weight: 800;
    }

    .hero-right {
      display: flex;
      justify-content: center;
    }

    .data-sphere {
      width: 320px;
      height: 320px;
      background: radial-gradient(circle at 30% 30%, rgba(124,77,255,0.3), rgba(0,229,255,0.1));
      border-radius: 50%;
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.15);
      box-shadow: 0 0 80px rgba(0,229,255,0.25);
      animation: float 6s infinite ease-in-out;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-18px); }
      100% { transform: translateY(0px); }
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      text-align: left;
      position: relative;
    }

    .metric-value {
      font-size: 48px;
      font-weight: 800;
      color: var(--electric-cyan);
      font-feature-settings: "tnum";
      margin-bottom: 8px;
    }

    .trend-bar {
      height: 4px;
      background: linear-gradient(90deg, var(--cool-purple), var(--electric-cyan));
      width: 70%;
      margin: 16px 0 8px;
      border-radius: 2px;
    }

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

    .service-card {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      align-items: flex-start;
      text-align: left;
      position: relative;
    }

    .service-icon {
      font-size: 32px;
      color: var(--electric-cyan);
      margin-bottom: 20px;
    }

    .service-card h3 {
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 28px;
    }

    .service-card:hover {
      border-color: rgba(0,229,255,0.35);
      transform: translateY(-5px);
    }

    /* 结果对比 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .divider-glow {
      width: 2px;
      height: 100%;
      background: linear-gradient(180deg, var(--cool-purple), var(--electric-cyan));
      opacity: 0.6;
    }

    .before-list, .after-list {
      list-style: none;
    }

    .before-list li {
      color: #9A9FBF;
      text-decoration: line-through;
      margin-bottom: 16px;
    }

    .after-list li {
      color: var(--electric-cyan);
      font-weight: 600;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      border-left: 3px solid var(--electric-cyan);
      padding-left: 24px;
      margin-bottom: 24px;
      cursor: pointer;
      transition: background 0.2s;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 0;
    }

    /* 表单 */
    .form-card input, .form-card textarea {
      width: 100%;
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(0,229,255,0.4);
      padding: 14px 8px;
      color: #fff;
      font-size: 16px;
      margin-bottom: 28px;
      transition: border 0.2s;
    }

    .form-card input:focus, .form-card textarea:focus {
      border-bottom: 2px solid var(--electric-cyan);
    }

    /* 页脚 */
    footer {
      padding: 60px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

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

    @media (max-width: 768px) {
      .desktop-nav { display: none; }
      .mobile-bottom-nav { display: flex; }
      h1 { font-size: 34px; }
      h2 { font-size: 28px; }
      .container { padding: 0 20px; }
      .metrics-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .comparison-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      section { padding: 80px 0; }
    }