/* roulang page: index */
:root {
      --primary-deep: #0B3B2F;
      --accent-cyan: #00C9A7;
      --accent-cyan-hover: #00A88C;
      --bg-warm: #F7F9F8;
      --card-white: #FFFFFF;
      --text-main: #1A2E29;
      --text-secondary: #5F6C6A;
      --border-light: #E6EDEA;
      --faq-bg: #F4F6F5;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.08);
      --radius-card: 16px;
      --radius-btn: 40px;
      --radius-faq: 12px;
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, .h1, .h2, .h3 {
      font-family: var(--font-title);
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
    }
    /* 导航自定义 */
    .navbar-custom {
      background: rgba(247, 249, 248, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      padding: 0 16px;
      transition: var(--transition);
    }
    .navbar-custom.scrolled {
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .logo-text {
      font-family: var(--font-title);
      font-weight: 900;
      font-size: 1.8rem;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }
    .logo-text span {
      color: var(--accent-cyan);
    }
    .logo-sub {
      font-size: 0.7rem;
      font-weight: 500;
      color: var(--text-secondary);
      letter-spacing: 1px;
      margin-left: 4px;
    }
    .nav-link-custom {
      font-weight: 500;
      color: var(--text-main) !important;
      padding: 0.5rem 1rem;
      margin: 0 0.2rem;
      position: relative;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-link-custom::after {
      content: '';
      position: absolute;
      left: 1rem;
      bottom: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.2s ease;
    }
    .nav-link-custom:hover::after,
    .nav-link-custom.active::after {
      width: calc(100% - 2rem);
    }
    .btn-primary-custom {
      background: var(--accent-cyan);
      border: none;
      color: #fff;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 26px;
      transition: var(--transition);
      box-shadow: none;
    }
    .btn-primary-custom:hover {
      background: var(--accent-cyan-hover);
      color: #fff;
      box-shadow: 0 4px 10px rgba(0,201,167,0.3);
    }
    .btn-outline-custom {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 10px 26px;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background: var(--primary-deep);
      color: #fff;
    }
    /* Hero区域 */
    .hero-section {
      background: linear-gradient(135deg, rgba(11,59,47,0.02) 0%, rgba(0,201,167,0.03) 100%);
      padding: 80px 0 80px;
      position: relative;
    }
    .hero-decor {
      position: absolute;
      top: 0;
      right: 0;
      width: 45%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 40%, rgba(0,201,167,0.06) 0%, transparent 50%);
      pointer-events: none;
    }
    .hero-title {
      font-size: 44px;
      line-height: 1.2;
      color: var(--primary-deep);
      margin-bottom: 1.2rem;
    }
    .section-title {
      font-size: 32px;
      line-height: 1.3;
      color: var(--primary-deep);
      margin-bottom: 1rem;
    }
    .card-custom {
      background: var(--card-white);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      padding: 2rem 1.5rem;
      transition: var(--transition);
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 1rem;
    }
    .data-number {
      font-family: 'Inter', monospace;
      font-weight: 700;
      font-size: 2rem;
      color: var(--accent-cyan);
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      padding: 2rem 1.5rem;
      transition: var(--transition);
    }
    .pricing-highlight {
      border: 2px solid var(--accent-cyan);
      position: relative;
    }
    .badge-recommend {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent-cyan);
      color: #fff;
      font-weight: 600;
      padding: 4px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    .accordion-button:not(.collapsed) {
      background-color: var(--faq-bg);
      color: var(--primary-deep);
      font-weight: 600;
      box-shadow: none;
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 12px;
      border-radius: var(--radius-faq);
      background: var(--faq-bg);
    }
    .footer-logo {
      font-size: 1.6rem;
      font-weight: 900;
      color: var(--primary-deep);
    }
    .social-icon {
      width: 38px;
      height: 38px;
      border: 1px solid var(--text-secondary);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-right: 8px;
      color: var(--text-secondary);
      transition: var(--transition);
    }
    .social-icon:hover {
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .navbar-collapse {
        background: rgba(247,249,248,0.98);
        padding: 1rem;
        border-radius: 16px;
      }
      .hero-section {
        padding: 40px 0 60px;
      }
    }