/* roulang page: index */
:root {
      --primary: #E8614D;
      --primary-hover: #D04A38;
      --primary-light: #FDE8E4;
      --secondary-bg: #F7EFE6;
      --deep-blue: #1A2A3A;
      --accent-green: #2A9D8F;
      --gray-50: #F9FAFB;
      --gray-100: #F3F4F6;
      --gray-200: #E5E7EB;
      --gray-400: #9CA3AF;
      --gray-500: #6B7280;
      --gray-600: #4B5563;
      --gray-700: #374151;
      --gray-800: #1F2937;
      --gray-900: #111827;
      --white: #ffffff;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-hover: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -6px rgba(0,0,0,0.04);
      --transition: 0.25s ease;
      --max-width: 1280px;
      --nav-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      background-color: var(--white);
      color: var(--gray-700);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      font-weight: 600;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航栏 SaaS 命令栏风格 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--gray-200);
      z-index: 100;
      transition: box-shadow var(--transition);
    }
    .site-header.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--deep-blue);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--gray-700);
    }
    .nav-links a {
      padding: 6px 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);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .search-trigger {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--gray-50);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--gray-600);
      transition: background var(--transition);
    }
    .search-trigger:hover {
      background: var(--gray-100);
    }
    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 8px 18px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9rem;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 2px 6px rgba(232,97,77,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 14px rgba(232,97,77,0.3);
      transform: translateY(-1px);
    }
    .mobile-menu-btn {
      display: none;
      font-size: 1.8rem;
      color: var(--gray-700);
      background: none;
      border: none;
    }
    @media (max-width: 1024px) {
      .nav-links, .header-actions .btn-outline, .header-actions .btn-primary {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 56px 0;
      }
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--deep-blue);
      margin-bottom: 1rem;
      text-align: center;
    }
    .section-subtitle {
      color: var(--gray-500);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 3rem;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, #FDF8F5 0%, var(--secondary-bg) 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--deep-blue);
      line-height: 1.3;
      margin-bottom: 1.25rem;
    }
    .hero-left .sub {
      font-size: 1.2rem;
      color: var(--gray-600);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 2rem;
    }
    .hero-stats {
      display: flex;
      gap: 2rem;
      color: var(--gray-600);
      font-size: 0.9rem;
    }
    .hero-stats strong {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      display: block;
    }
    .hero-right img {
      width: 100%;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-hover);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-left .sub, .hero-cta, .hero-stats {
        justify-content: center;
        margin-left: auto;
        margin-right: auto;
      }
      .hero-right {
        margin-top: 2rem;
      }
    }
    @media (max-width: 640px) {
      .hero-left h1 {
        font-size: 2rem;
      }
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) {
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.5rem;
      margin-bottom: 16px;
    }
    .feature-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 64px;
    }
    .feature-row.reverse {
      direction: rtl;
    }
    .feature-row.reverse .feature-text {
      direction: ltr;
    }
    .feature-text h3 {
      font-size: 1.5rem;
      color: var(--deep-blue);
      margin-bottom: 1rem;
    }
    .feature-list {
      list-style: none;
      margin: 1.5rem 0;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 0.75rem;
      color: var(--gray-700);
    }
    .feature-list li::before {
      content: "✓";
      color: var(--accent-green);
      font-weight: 700;
    }
    .feature-image img {
      border-radius: var(--radius-md);
      width: 100%;
    }
    @media (max-width: 1024px) {
      .feature-row {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .feature-row.reverse {
        direction: ltr;
      }
    }

    .scenario-card {
      background: var(--gray-50);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: border 0.2s;
      border: 1px solid transparent;
    }
    .scenario-card:hover {
      border-color: var(--primary);
    }
    .case-highlight {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-green);
    }
    .pricing-card {
      border: 1px solid var(--gray-200);
      text-align: center;
      padding: 32px 24px;
    }
    .pricing-card.recommended {
      border: 2px solid var(--primary);
      position: relative;
    }
    .badge {
      background: var(--primary);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--deep-blue);
      margin: 1rem 0;
    }

    .faq-item {
      border-bottom: 1px solid var(--gray-200);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: var(--deep-blue);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--gray-600);
      padding-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .cta-banner {
      background: var(--deep-blue);
      color: white;
      text-align: center;
      padding: 72px 24px;
      border-radius: var(--radius-lg);
      background-image: radial-gradient(circle at 20% 30%, rgba(232,97,77,0.2) 0%, transparent 40%);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      color: #ccc;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    footer {
      background: var(--deep-blue);
      padding: 60px 0 30px;
    }