/* roulang page: index */
:root {
      --primary-red: #E63946;
      --primary-red-deep: #C1121F;
      --accent-gold: #F4A261;
      --accent-gold-deep: #C77D3A;
      --dark-charcoal: #1D1D1D;
      --gray-bg: #FAFAFA;
      --gray-light: #F5F5F5;
      --gray-border: #E5E5E5;
      --text-primary: #1D1D1D;
      --text-secondary: #555555;
      --text-on-dark: #F0F0F0;
      --white: #FFFFFF;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-pill: 50px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 12px 28px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.06);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --transition: 0.25s ease;
      --header-height: 72px;
    }

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

    html {
      scroll-behavior: smooth;
    }

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

    h1 {
      font-size: 3rem; /* 48px */
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 2.5rem; /* 40px */
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }

    h3 {
      font-size: 1.5rem; /* 24px */
      font-weight: 600;
      margin-bottom: 8px;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: all var(--transition);
      border: none;
      outline: none;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary-red);
      color: var(--white);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      box-shadow: 0 8px 18px rgba(230, 57, 70, 0.25);
    }

    .btn-primary:hover {
      background: var(--primary-red-deep);
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(230, 57, 70, 0.35);
    }

    .btn-outline {
      background: transparent;
      color: var(--text-primary);
      border: 2px solid var(--text-primary);
      padding: 12px 30px;
      border-radius: var(--radius-pill);
    }

    .btn-outline:hover {
      background: var(--text-primary);
      color: var(--white);
      border-color: var(--text-primary);
    }

    .btn-white {
      background: var(--white);
      color: var(--primary-red);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      box-shadow: 0 8px 18px rgba(0,0,0,0.1);
    }

    .btn-white:hover {
      background: rgba(255,255,255,0.9);
      transform: scale(1.03);
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title h2 {
      color: var(--text-primary);
    }

    .section-title p {
      color: var(--text-secondary);
      font-size: 1.125rem;
      max-width: 700px;
      margin: 0 auto;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(244, 162, 97, 0.12);
      color: var(--accent-gold-deep);
      font-weight: 600;
      font-size: 0.8125rem;
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--gray-border);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      color: var(--primary-red);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: #333;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color var(--transition), border-color var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-red);
      border-bottom-color: var(--primary-red);
    }

    .mega-trigger {
      position: relative;
      cursor: pointer;
      font-weight: 500;
      color: #333;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .mega-panel {
      position: absolute;
      top: 100%;
      right: 0;
      margin-top: 16px;
      background: var(--white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      width: 320px;
      padding: 20px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(8px);
      transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      z-index: 101;
    }

    .mega-trigger:hover .mega-panel,
    .mega-trigger:focus-within .mega-panel {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    .mega-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.9rem;
      color: var(--text-primary);
      padding: 6px;
      border-radius: 6px;
      transition: background var(--transition);
    }

    .mega-item:hover {
      background: var(--gray-light);
      color: var(--primary-red);
    }

    .mega-cta {
      grid-column: span 2;
      margin-top: 8px;
    }

    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--text-primary);
      background: none;
      border: none;
      padding: 8px;
    }

    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.06);
        border-bottom: 1px solid var(--gray-border);
      }

      .nav-links.active {
        display: flex;
      }

      .hamburger {
        display: block;
      }

      .mega-panel {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        width: 100%;
        margin-top: 12px;
        padding: 12px;
        display: none;
        background: var(--gray-light);
      }

      .mega-trigger:hover .mega-panel,
      .mega-trigger:focus-within .mega-panel {
        display: grid;
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: var(--white);
    }

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

    .hero-content h1 {
      margin-bottom: 20px;
      color: var(--text-primary);
    }

    .hero-content .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .stats-row {
      display: flex;
      gap: 28px;
      flex-wrap: wrap;
    }

    .stat-item {
      display: flex;
      flex-direction: column;
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-red);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-secondary);
    }

    .hero-visual {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: linear-gradient(135deg, rgba(230,57,70,0.1) 0%, rgba(244,162,97,0.08) 100%);
    }

    .hero-visual img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-lg);
      object-fit: cover;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
    }

    /* 核心优势不对称网格 */
    .value-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }

    .value-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

    .value-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .value-card.large {
      grid-row: span 2;
    }

    .value-card i {
      color: var(--primary-red);
      font-size: 2rem;
      margin-bottom: 16px;
    }

    .small-cards {
      display: grid;
      gap: 24px;
    }

    @media (max-width: 768px) {
      .value-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 功能分组交替 */
    .feature-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .feature-row.reverse {
      direction: rtl;
    }

    .feature-row.reverse .feature-text {
      direction: ltr;
    }

    .feature-text ul {
      list-style: none;
      margin: 20px 0;
    }

    .feature-text li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
      color: var(--text-secondary);
    }

    .feature-text li i {
      color: var(--primary-red);
    }

    .feature-image img {
      border-radius: var(--radius-lg);
      width: 100%;
    }

    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
      }
    }

    /* 场景卡片滚动 */
    .scenarios-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }

    .scenario-card {
      flex: 0 0 280px;
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      transition: var(--transition);
    }

    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .scenario-card img {
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
      height: 180px;
      object-fit: cover;
      width: 100%;
    }

    .scenario-info {
      padding: 20px;
    }

    .tags {
      display: flex;
      gap: 8px;
      margin-top: 12px;
    }

    .tag {
      border: 1px solid var(--primary-red);
      color: var(--primary-red);
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 20px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: var(--gray-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      gap: 24px;
    }

    .case-logo {
      width: 80px;
      height: 80px;
      background: #ddd;
      border-radius: var(--radius-md);
      flex-shrink: 0;
    }

    .case-metric {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-red);
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
    }

    .pricing-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: var(--transition);
      border: 2px solid transparent;
    }

    .pricing-card.featured {
      border-color: var(--primary-red);
      position: relative;
      transform: scale(1.02);
    }

    .popular-badge {
      background: var(--primary-red);
      color: white;
      font-size: 0.8rem;
      padding: 4px 16px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }

    .price {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--text-primary);
      margin: 20px 0;
    }

    /* FAQ */
    .faq-list details {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

    .faq-list summary {
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-list details[open] summary {
      color: var(--primary-red);
      border-left: 3px solid var(--primary-red);
      padding-left: 12px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #E63946 0%, #F4A261 100%);
      border-radius: var(--radius-lg);
      padding: 80px 40px;
      text-align: center;
      color: white;
    }

    /* 页脚 */
    .site-footer {
      background: var(--dark-charcoal);
      color: #CCCCCC;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      section {
        padding: 60px 0;
      }
    }