/* roulang page: index */
:root {
      --primary: #0A192F;
      --primary-light: #112240;
      --accent: #FF4C29;
      --accent-hover: #e6401f;
      --bg-white: #FFFFFF;
      --bg-light: #F8FAFC;
      --text-heading: #0F172A;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --border-light: rgba(0,0,0,0.05);
      --border-input: #CBD5E1;
      --shadow-card: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
      --shadow-card-hover: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }
    .header.scrolled {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-heading);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--accent), #ff7b4a);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 1rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s;
    }
    .nav-links a:hover {
      color: var(--text-heading);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(255,76,41,0.2);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 20px rgba(255,76,41,0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 28px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-heading);
      border-radius: 2px;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      right: 0;
      width: 70%;
      max-width: 320px;
      height: 100vh;
      background: white;
      box-shadow: -10px 0 25px rgba(0,0,0,0.08);
      padding: 24px;
      flex-direction: column;
      gap: 32px;
      z-index: 200;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, #0b1d3a 0%, #0e2a4a 100%);
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 500;
      margin-bottom: 24px;
      color: #ffb29e;
    }
    h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -1px;
      color: white;
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .data-sphere {
      width: 320px;
      height: 320px;
      background: radial-gradient(circle at 30% 30%, rgba(255,76,41,0.3), rgba(10,25,47,0.9));
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 60px rgba(255,76,41,0.25);
      backdrop-filter: blur(4px);
    }
    .live-stats {
      display: flex;
      gap: 32px;
      margin-top: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      font-feature-settings: "tnum";
      color: var(--accent);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-label {
      text-transform: uppercase;
      font-weight: 600;
      font-size: 0.9rem;
      letter-spacing: 1px;
      color: var(--accent);
      margin-bottom: 8px;
    }
    h2 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--accent), #ff9466);
      border-radius: 2px;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 600px;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 24px;
    }
    .data-card {
      background: white;
      padding: 28px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      text-align: center;
      transition: var(--transition);
    }
    .data-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .data-big {
      font-size: 3rem;
      font-weight: 800;
      font-feature-settings: "tnum";
      color: var(--primary);
      line-height: 1.1;
    }
    .data-label {
      color: var(--text-muted);
      margin-top: 8px;
      font-weight: 500;
    }
    /* Bento 服务矩阵 */
    .bento-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .bento-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      border: 1px solid var(--border-light);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .bento-card.large {
      grid-column: span 2;
      flex-direction: row;
      align-items: center;
      gap: 32px;
    }
    .bento-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .bento-icon {
      font-size: 2rem;
    }
    .bento-title {
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--text-heading);
    }
    /* 对比 */
    .comparison-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .comp-left, .comp-right {
      padding: 40px;
    }
    .comp-left {
      background: #f1f5f9;
      color: #334155;
    }
    .comp-right {
      background: var(--primary);
      color: white;
    }
    .comp-list {
      list-style: none;
      margin-top: 24px;
    }
    .comp-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 20px 0;
      font-weight: 600;
      font-size: 1.1rem;
      text-align: left;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-heading);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 480px;
      margin: 32px auto 0;
    }
    .cta-input {
      background: transparent;
      border: none;
      border-bottom: 2px solid rgba(255,255,255,0.3);
      padding: 14px 4px;
      color: white;
      font-size: 1rem;
      outline: none;
      transition: border 0.2s;
    }
    .cta-input:focus {
      border-bottom-color: var(--accent);
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
      border-top: 1px solid var(--border-light);
    }
    .footer-copy {
      text-align: center;
      padding: 24px 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    @media (max-width: 1024px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .bento-grid {
        grid-template-columns: 1fr 1fr;
      }
      .data-grid {
        grid-template-columns: 1fr 1fr;
      }
      .comparison-container {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu { display: flex; }
      h1 { font-size: 2.5rem; }
      .bento-grid { grid-template-columns: 1fr; }
      .bento-card.large { grid-column: span 1; flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }