/* roulang page: index */
:root {
      --primary: #005AFF;
      --primary-hover: #0047CC;
      --primary-light: rgba(0,90,255,0.1);
      --secondary: #00C9A7;
      --bg: #F5F6FA;
      --white: #FFFFFF;
      --text: #1F2329;
      --text-secondary: #86909C;
      --text-foot: rgba(255,255,255,0.7);
      --border-light: #E8EBF0;
      --deep-bg: #0A1A3F;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --radius: 16px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04), 0 0 1px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08), 0 0 1px rgba(0,0,0,0.08);
      --shadow-nav: 0 1px 4px rgba(0,0,0,0.04);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --spacing-xs: 8px;
      --spacing-sm: 16px;
      --spacing-md: 24px;
      --spacing-lg: 32px;
      --spacing-xl: 48px;
      --spacing-2xl: 64px;
      --max-width: 1200px;
      --transition: 200ms ease-out;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 var(--spacing-lg);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius);
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: var(--shadow-nav);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.92);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--text);
      font-weight: 400;
      font-size: 18px;
    }

    .nav-links {
      display: flex;
      gap: var(--spacing-lg);
      align-items: center;
    }

    .nav-links a {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 16px;
      padding: 8px 0;
      transition: color var(--transition);
      position: relative;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a:focus-visible {
      color: var(--primary);
      outline: none;
    }

    .btn-primary-nav {
      background: var(--primary);
      color: var(--white) !important;
      padding: 12px 28px !important;
      border-radius: 30px;
      font-weight: 500;
      box-shadow: 0 4px 10px rgba(0,90,255,0.25);
      transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
      margin-left: 8px;
    }
    .btn-primary-nav:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 16px rgba(0,90,255,0.35);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, #F5F6FA 0%, #FFFFFF 100%);
      min-height: 80vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-text h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text);
      margin-bottom: var(--spacing-md);
    }
    .hero-text .highlight {
      color: var(--primary);
      position: relative;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: var(--spacing-lg);
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      gap: var(--spacing-sm);
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 500;
      font-size: 16px;
      box-shadow: 0 4px 14px rgba(0,90,255,0.3);
      transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
      animation: pulse-glow 2s infinite;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 0 0 rgba(0,90,255,0.4); }
      70% { box-shadow: 0 0 0 12px rgba(0,90,255,0); }
      100% { box-shadow: 0 0 0 0 rgba(0,90,255,0); }
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 8px 22px rgba(0,90,255,0.4);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 14px 36px;
      border-radius: 30px;
      font-weight: 500;
      transition: background var(--transition), border-color var(--transition);
    }
    .btn-secondary:hover {
      background: rgba(0,90,255,0.05);
      border-color: var(--primary-hover);
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 420px;
      box-shadow: var(--shadow-card-hover);
      display: flex;
      align-items: center;
      justify-content: center;
      backdrop-filter: blur(2px);
      position: relative;
      overflow: hidden;
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-title h2 {
      font-size: 32px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-secondary);
      font-size: 18px;
    }

    /* 优势卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--spacing-md);
    }
    .feature-card {
      background: var(--white);
      padding: 32px 28px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition), box-shadow var(--transition);
      text-align: center;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(0,90,255,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--primary);
      font-size: 28px;
    }
    .feature-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }

    /* 产品网格 6项 */
    .grid-2x3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--spacing-md);
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      align-items: flex-start;
      gap: 20px;
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 26px;
      color: var(--secondary);
      background: rgba(0,201,167,0.1);
      padding: 12px;
      border-radius: 12px;
    }
    .service-text h3 {
      font-size: 20px;
      margin-bottom: 6px;
    }

    /* 场景图文 */
    .scene-row {
      display: flex;
      gap: 48px;
      align-items: center;
      margin-bottom: 64px;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-img {
      flex: 1;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .scene-content {
      flex: 1;
    }
    .scene-content h3 {
      font-size: 24px;
      margin-bottom: 16px;
    }

    /* 数据案例 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--spacing-md);
      margin-top: 30px;
    }
    .stat-card {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius);
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--radius);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
      border-left: 4px solid transparent;
      transition: border-color var(--transition);
    }
    .faq-item.active {
      border-left-color: var(--primary);
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: transparent;
      width: 100%;
      border: none;
      text-align: left;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #FAFBFC;
      padding: 0 28px;
      color: #5A6270;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 28px;
    }
    .arrow {
      font-size: 18px;
      transition: transform var(--transition);
    }
    .faq-item.active .arrow {
      transform: rotate(180deg);
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--deep-bg);
      border-radius: 32px;
      padding: 64px var(--spacing-xl);
      text-align: center;
      color: white;
      margin: 40px 0;
    }
    .cta-banner h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }
    .btn-light {
      background: white;
      color: var(--primary);
      padding: 14px 40px;
      border-radius: 30px;
      font-weight: 600;
      margin-top: 24px;
      display: inline-block;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-bg);
      color: white;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-links a {
      display: block;
      color: var(--text-foot);
      margin-bottom: 8px;
      font-size: 15px;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      color: var(--text-foot);
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .grid-2x3, .grid-3 { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .hamburger { display: flex; }
      .nav-links { display: none; position: absolute; top: 72px; left:0; width:100%; background: white; flex-direction: column; padding: 24px; box-shadow: var(--shadow-nav); }
      .nav-links.active { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .grid-3, .grid-2x3 { grid-template-columns: 1fr; }
      .scene-row, .scene-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }