/* roulang page: index */
:root {
      --primary: #1E3A5F;
      --primary-dark: #152B45;
      --accent: #C49A2B;
      --accent-light: #d4af37;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --text: #2C3E50;
      --text-light: #5A6B7F;
      --border: #DDE2E8;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --radius: 10px;
      --radius-lg: 16px;
      --radius-btn: 6px;
      --transition: 0.25s ease;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--accent);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      margin-top: 0;
    }
    h1 { font-size: 2.25rem; font-weight: 700; letter-spacing: -0.5px; }
    h2 { font-size: 1.75rem; margin-bottom: 1rem; }
    h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
    .text-accent { color: var(--accent); }
    .text-primary { color: var(--primary); }
    .bg-primary { background-color: var(--primary); }
    .bg-accent { background-color: var(--accent); }

    /* 按钮 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      font-size: 1rem;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      color: white;
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(30,58,95,0.08);
      color: var(--primary-dark);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border-color: var(--accent);
      font-weight: 700;
    }
    .btn-accent:hover {
      background: #b3891f;
      border-color: #b3891f;
      color: white;
    }

    /* 导航 */
    .top-bar {
      background: white;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 100;
      padding: 0.5rem 0;
    }
    .top-bar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      gap: 1.8rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .mega-trigger {
      position: relative;
      cursor: pointer;
      font-weight: 500;
      color: var(--text);
    }
    .mega-panel {
      display: none;
      position: absolute;
      top: 45px;
      right: 0;
      background: white;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      padding: 24px;
      width: 520px;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      z-index: 200;
      border: 1px solid var(--border);
    }
    .mega-trigger:hover .mega-panel {
      display: grid;
    }
    .mega-col h4 {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: var(--text-light);
      margin-bottom: 12px;
    }
    .mega-item {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 8px 0;
      color: var(--text);
      font-size: 0.9rem;
    }
    .mega-item i {
      color: var(--accent);
      width: 20px;
    }
    .news-card {
      background: var(--bg);
      border-radius: 8px;
      padding: 10px;
      margin-bottom: 8px;
      font-size: 0.85rem;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--primary);
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #EDF2F9 0%, #F7F9FC 100%);
      padding: 4rem 0;
      min-height: 500px;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      width: 100%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 1.5rem;
    }

    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 2.5rem;
    }
    .section-title h2 {
      margin-bottom: 0.5rem;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      transition: all var(--transition);
      height: 100%;
      border: 1px solid transparent;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    /* 功能分组交替 */
    .alt-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 60px;
    }
    .alt-row img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }
    .checklist {
      list-style: none;
      padding: 0;
    }
    .checklist li {
      margin-bottom: 12px;
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }
    .checklist i {
      color: var(--accent);
      margin-top: 3px;
    }

    /* 场景卡片 */
    .scene-card {
      background: white;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scene-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .scene-card img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .scene-caption {
      padding: 20px;
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border: 1px solid #e9edf2;
      border-radius: var(--radius);
      padding: 24px;
      transition: border 0.2s;
    }
    .case-card:hover {
      border-color: var(--primary);
    }
    .case-logo {
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .case-stat {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* 价格卡 */
    .pricing-highlight {
      border: 2px solid var(--primary);
      transform: scale(1.02);
      position: relative;
      z-index: 2;
      background: white;
    }

    /* FAQ */
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 500;
      background: white;
      border-radius: 8px;
      padding: 16px 20px;
      border: 1px solid var(--border);
      margin-bottom: 4px;
    }
    .accordion-content {
      background: #fafbfc;
      padding: 16px 20px;
    }

    /* CTA */
    .cta-section {
      background: #F0F4FA;
      background-image: radial-gradient(circle at 10% 20%, rgba(196,154,43,0.05) 0%, transparent 35%);
    }
    .contact-form input,
    .contact-form textarea {
      border: 1px solid var(--border);
      border-radius: var(--radius-btn);
      padding: 12px;
      height: 44px;
      width: 100%;
      margin-bottom: 16px;
    }
    .contact-form textarea {
      height: 100px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #B0C4DE;
      padding: 48px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a {
      color: #B0C4DE;
    }
    .footer a:hover {
      color: white;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 14px;
      border: 1px solid #B0C4DE;
      border-radius: 50%;
      padding: 8px;
      transition: 0.2s;
    }
    .social-icons i:hover {
      background: var(--accent);
      border-color: var(--accent);
      color: white;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-grid, .alt-row, .footer-grid { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: 1fr; }
      h1 { font-size: 1.8rem; }
      section { padding: 48px 0; }
    }

.mobile-show { display: flex !important; flex-direction: column; position: absolute; top: 60px; left: 0; background: white; width: 100%; padding: 20px; box-shadow: 0 8px 20px rgba(0,0,0,0.1); }