/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent: #00F0FF;
      --danger: #FF4655;
      --bg: #F5F6FA;
      --card: #FFFFFF;
      --dark-bg: #141832;
      --text: #1A1A2E;
      --text-secondary: #6B7280;
      --text-light: #FFFFFF;
      --border: #E5E7EB;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --transition: 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 39, 0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: background 0.3s;
    }
    #header.scrolled {
      background: rgba(10, 14, 39, 0.98);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      padding: 0 24px;
      max-width: 1280px;
      margin: 0 auto;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M13 2L3 14h9l-2 8 10-12h-9l2-8z"/></svg>') center/contain no-repeat;
      background: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      font-size: 15px;
    }
    .btn-nav:hover {
      background: #33F5FF;
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(10,14,39,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 24px;
      font-weight: 600;
    }
    .mobile-menu .btn-nav {
      margin-top: 20px;
      font-size: 20px;
      padding: 14px 40px;
    }
    /* 首屏 */
    #hero {
      background: linear-gradient(135deg, #0A0E27 0%, #1a1f3a 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 80px;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/hero-bg.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 0;
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-left {
      flex: 1;
      color: white;
    }
    .hero-left h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-left .highlight {
      color: var(--accent);
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #33F5FF;
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      font-weight: 700;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-illustration {
      width: 100%;
      max-width: 500px;
      height: auto;
      filter: drop-shadow(0 0 30px rgba(0,240,255,0.3));
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .section-sub {
      text-align: center;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto 48px;
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--card);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    /* 数据展示 */
    #live-data {
      background: var(--dark-bg);
      color: white;
    }
    .data-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .data-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: var(--radius-card);
      padding: 28px;
      backdrop-filter: blur(4px);
    }
    .data-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }
    .live-badge {
      display: inline-block;
      background: var(--danger);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-left: 8px;
    }
    /* 产品方案 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .product-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
      transition: var(--transition);
      border: 2px solid transparent;
    }
    .product-card.featured {
      border-color: var(--accent);
      box-shadow: 0 0 25px rgba(0,240,255,0.2);
    }
    .hot-tag {
      position: absolute;
      top: 16px;
      right: 16px;
      background: var(--danger);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
    }
    .product-price {
      font-size: 32px;
      font-weight: 800;
      color: var(--accent);
      margin: 12px 0;
    }
    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .case-stat {
      font-size: 36px;
      font-weight: 800;
      color: var(--accent);
    }
    /* FAQ */
    .faq-item {
      background: var(--card);
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid var(--border);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    /* CTA */
    #cta {
      background: var(--primary);
      color: white;
      text-align: center;
    }
    /* 页脚 */
    footer {
      background: var(--primary);
      color: #9CA3AF;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .features-grid, .product-grid, .data-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-container {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; }
      .features-grid, .product-grid, .data-grid, .case-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-left h1 { font-size: 32px; }
      section { padding: 60px 0; }
    }