/* roulang page: index */
:root {
      --primary: #0B1E14;
      --accent: #E85D04;
      --accent-hover: #C4480A;
      --bg: #FAFAF7;
      --white: #FFFFFF;
      --text-primary: #1A2A20;
      --text-secondary: #5A6B60;
      --border-light: rgba(11,30,20,0.06);
      --border-medium: #D1D6D3;
      --shadow-sm: 0 4px 12px rgba(11,30,20,0.04);
      --shadow-card: 0 8px 30px rgba(11,30,20,0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: 0.25s ease;
      --font-sans: 'Inter', 'HarmonyOS Sans', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --font-mono: 'Space Grotesk', 'Inter', monospace;
      --container-max: 1280px;
      --section-gap: 120px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: all var(--transition);
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h2 {
      font-size: 2.2rem;
      letter-spacing: -0.3px;
      margin-bottom: 1.5rem;
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    h2::before {
      content: '';
      display: inline-block;
      width: 40px;
      height: 3px;
      background: var(--accent);
      border-radius: 4px;
    }

    .section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      :root { --section-gap: 80px; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      :root { --section-gap: 64px; }
      h2 { font-size: 1.8rem; }
    }

    /* 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(250,250,247,0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.03);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
      max-width: var(--container-max);
      margin: 0 auto;
    }
    .logo {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo .dot {
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
      font-weight: 500;
      color: var(--text-primary);
    }
    .nav-links a {
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }
    .nav-links a:hover::after { width: 100%; }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1.2rem;
    }
    .search-icon {
      font-size: 1.2rem;
      color: var(--text-primary);
    }
    .login-link {
      font-weight: 500;
      color: var(--text-primary);
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 4px 10px rgba(232,93,4,0.2);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-icon, .nav-actions .login-link {
        display: none;
      }
      .hamburger { display: flex; }
      .header { background: rgba(250,250,247,0.9); backdrop-filter: blur(8px); }
      .nav { padding: 12px 0; }
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 3rem;
      background: radial-gradient(circle at 20% 30%, rgba(11,30,20,0.01) 0%, transparent 60%);
    }
    .hero-content { flex: 1; }
    .hero h1 {
      font-size: 3rem;
      color: var(--primary);
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }
    .hero .sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-btns {
      display: flex;
      gap: 1.5rem;
      align-items: center;
      flex-wrap: wrap;
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: rgba(11,30,20,0.04);
    }
    .hero-visual {
      flex: 1;
      background: rgba(11,30,20,0.02);
      border-radius: var(--radius-lg);
      padding: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .dashboard-mock {
      width: 100%;
      background: white;
      border-radius: 16px;
      padding: 20px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .chart-bars {
      display: flex;
      align-items: flex-end;
      gap: 10px;
      height: 100px;
    }
    .bar {
      background: var(--primary);
      width: 100%;
      border-radius: 6px 6px 0 0;
      opacity: 0.8;
    }
    .bar.accent { background: var(--accent); width: 70%; }
    .live-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 120px 0 60px;
        text-align: center;
      }
      .hero h1 { font-size: 2rem; }
      .hero-btns { justify-content: center; }
      .hero-visual { width: 100%; }
    }

    /* 功能矩阵 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 2rem;
    }
    .feature-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-card);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 2rem;
      margin-bottom: 1.2rem;
      color: var(--accent);
    }
    .feature-card h3 {
      font-size: 1.2rem;
      margin-bottom: 0.7rem;
    }
    .feature-card p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin-bottom: 1rem;
    }
    .feature-link {
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--accent);
      margin-top: auto;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 520px) {
      .features-grid { grid-template-columns: 1fr; }
    }

    /* 场景横向滚动 */
    .scenarios-wrapper {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
    }
    .scenarios-wrapper::-webkit-scrollbar { display: none; }
    .scenario-card {
      flex: 0 0 340px;
      scroll-snap-align: start;
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      transition: transform var(--transition);
    }
    .scenario-card:hover { transform: translateY(-4px); }
    .scenario-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s;
    }
    .scenario-card:hover .scenario-img { transform: scale(1.03); }
    .scenario-text {
      padding: 20px;
    }

    /* 案例 */
    .stats-highlight {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
      margin: 2rem 0;
    }
    .stat-item .number {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--accent);
    }
    .case-cards {
      display: grid;
      grid-template-columns: 5fr 3fr 3fr;
      gap: 20px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-light);
    }
    @media (max-width: 768px) {
      .case-cards { grid-template-columns: 1fr; }
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      border: 1px solid var(--border-light);
      text-align: center;
    }
    .plan-card.featured {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
      transform: scale(1.02);
    }
    .plan-price {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      margin: 1rem 0;
    }
    @media (max-width: 768px) {
      .pricing-grid { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 120px;
      margin-top: 12px;
    }
    @media (max-width: 768px) {
      .faq-grid { grid-template-columns: 1fr; }
    }

    /* CTA */
    .cta-dark {
      background: var(--primary);
      color: white;
      padding: 80px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      padding: 60px 0 30px;
    }
    .copyright {
      border-top: 1px solid var(--border-light);
      padding: 20px 0;
      font-size: 0.9rem;
      color: var(--text-secondary);
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      .footer-grid { grid-template-columns: 1fr; }
    }