/* roulang page: index */
:root {
      --primary-deep: #1E2D2F;
      --primary-warm: #2F353B;
      --accent-cyan: #00B4D8;
      --accent-amber: #F4A261;
      --bg-light: #FAFAF8;
      --bg-card: #FFFFFF;
      --bg-faq: #F4F6F5;
      --text-main: #1e2b2c;
      --text-muted: #5f6b6e;
      --border-light: #e6eae9;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --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-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.2px;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
    }
    h3 {
      font-size: 24px;
      line-height: 1.4;
      font-weight: 600;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航重塑 */
    .betano-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      transition: all 0.3s ease;
      border-bottom: 1px solid transparent;
    }
    .betano-nav.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-brand {
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    .nav-brand span {
      color: var(--accent-cyan);
    }
    .navbar-nav .nav-link {
      color: var(--primary-deep) !important;
      font-weight: 500;
      margin: 0 8px;
      padding: 8px 16px;
      border-radius: 20px;
      transition: 0.2s;
    }
    .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
      color: var(--accent-cyan) !important;
      background: rgba(0,180,216,0.08);
    }
    .mega-trigger {
      cursor: pointer;
      color: var(--primary-deep);
      font-weight: 500;
      padding: 8px 16px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: 0.2s;
    }
    .mega-trigger:hover {
      color: var(--accent-cyan);
      background: rgba(0,180,216,0.08);
    }
    .mega-panel {
      position: absolute;
      right: 0;
      top: 100%;
      width: 320px;
      background: white;
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.12);
      padding: 20px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: 0.25s ease;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      border: 1px solid var(--border-light);
    }
    .mega-wrapper:hover .mega-panel {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .mega-item {
      background: #f9fafb;
      border-radius: 10px;
      padding: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 500;
      transition: 0.2s;
      color: var(--text-main);
    }
    .mega-item i {
      color: var(--accent-cyan);
      font-size: 1.2rem;
    }
    .mega-item:hover {
      background: #eef7fa;
    }
    @media (max-width: 768px) {
      .mega-panel {
        position: static;
        width: 100%;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        margin-top: 10px;
        display: none;
      }
      .mega-wrapper.open .mega-panel {
        display: grid;
      }
    }
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #1E2D2F 0%, #141A1C 100%);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200" opacity="0.08"><path d="M20 180 L180 20" stroke="white" stroke-width="1" fill="none"/><circle cx="100" cy="100" r="1.5" fill="white"/></svg>');
      background-size: 60px 60px;
    }
    .hero-title {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.75);
      margin: 24px 0 32px;
    }
    .btn-primary-custom {
      background: var(--accent-cyan);
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      color: #fff;
      transition: 0.25s;
      box-shadow: 0 4px 12px rgba(0,180,216,0.3);
    }
    .btn-primary-custom:hover {
      background: #0096b0;
      box-shadow: 0 8px 20px rgba(0,180,216,0.5);
      color: white;
    }
    .btn-outline-amber {
      border: 2px solid var(--accent-amber);
      color: var(--accent-amber);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: 0.25s;
    }
    .btn-outline-amber:hover {
      background: rgba(244,162,97,0.1);
      border-color: #e0863a;
      color: #e0863a;
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .text-accent {
      color: var(--accent-cyan);
    }
    .bg-faq-light {
      background-color: var(--bg-faq);
    }
    /* 卡片 */
    .advantage-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      height: 100%;
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .card-scenario {
      background: white;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
      height: 100%;
    }
    .card-scenario:hover {
      border: 1px solid var(--accent-cyan);
      box-shadow: var(--shadow-hover);
    }
    .price-card {
      background: white;
      border-radius: 20px;
      padding: 40px 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
      border: 1px solid var(--border-light);
      transition: 0.25s;
    }
    .price-card.recommend {
      border: 2px solid var(--accent-cyan);
      transform: scale(1.03);
    }
    .badge-amber {
      background: var(--accent-amber);
      color: white;
      border-radius: 20px;
      padding: 4px 14px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .accordion-button:not(.collapsed) {
      background-color: #eef7fa;
      color: var(--primary-deep);
      box-shadow: none;
      border-left: 4px solid var(--accent-cyan);
    }
    .accordion-button {
      font-weight: 600;
      background: white;
    }
    footer {
      background: var(--primary-deep);
      color: #ddd;
      padding: 60px 0 30px;
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .feature-row {
        flex-direction: column;
        gap: 30px;
      }
      .feature-row.reverse {
        flex-direction: column;
      }
    }