/* roulang page: index */
:root {
      --bs-primary: #0A1F3F;
      --bs-danger: #E63946;
      --bs-body-bg: #F8FAFC;
      --bs-body-color: #1E293B;
      --color-accent: #E63946;
      --color-accent-hover: #C1121F;
      --color-dark: #0A1F3F;
      --color-text: #1E293B;
      --color-text-muted: #64748B;
      --color-border: #E2E8F0;
      --color-success: #10B981;
      --color-card-bg: #FFFFFF;
      --color-footer-bg: #0A1F3F;
      --font-mono: 'DIN Alternate', 'Roboto Mono', 'SF Mono', monospace;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bs-body-bg);
      color: var(--color-text);
      line-height: 1.7;
      margin: 0;
      padding-top: 70px; /* 固定导航高度 */
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      line-height: 1.3;
    }
    
    h1 {
      font-size: 2.75rem;
      letter-spacing: -0.5px;
      color: var(--color-dark);
    }
    
    h2 {
      font-size: 2rem;
      text-align: center;
      position: relative;
      margin-bottom: 2.5rem;
      color: var(--color-dark);
    }
    
    h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background-color: var(--color-accent);
      margin: 0.75rem auto 0;
      border-radius: 2px;
    }
    
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--color-dark);
    }
    
    .text-muted {
      color: var(--color-text-muted) !important;
    }
    
    .bg-primary-custom {
      background-color: var(--bs-primary);
    }
    
    .btn {
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
    }
    
    .btn-primary-custom {
      background-color: var(--color-accent);
      border: none;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    
    .btn-primary-custom:hover {
      background-color: var(--color-accent-hover);
      transform: scale(1.03);
      box-shadow: 0 8px 16px rgba(230, 57, 70, 0.3);
      color: white;
    }
    
    .btn-outline-primary-custom {
      background: transparent;
      border: 2px solid var(--color-dark);
      color: var(--color-dark);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    
    .btn-outline-primary-custom:hover {
      background-color: var(--color-dark);
      color: white;
      transform: scale(1.02);
    }
    
    .btn-light-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    
    .btn-light-outline:hover {
      background-color: white;
      color: var(--color-accent);
    }
    
    /* 导航栏 */
    .navbar {
      background-color: white;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      padding: 0.75rem 0;
    }
    
    .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--color-dark) !important;
      letter-spacing: 0.5px;
    }
    
    .navbar-brand i {
      color: var(--color-accent);
      margin-right: 6px;
    }
    
    .nav-link {
      color: var(--color-text) !important;
      font-weight: 500;
      font-size: 0.95rem;
      margin: 0 0.5rem;
      transition: color 0.2s;
    }
    
    .nav-link:hover {
      color: var(--color-accent) !important;
    }
    
    .navbar .btn-primary-custom {
      padding: 8px 20px;
      font-size: 0.9rem;
    }
    
    /* Hero */
    #hero {
      background-color: white;
      padding: 2rem 0 4rem;
    }
    
    .hero-badge {
      background: rgba(10, 31, 63, 0.05);
      color: var(--color-dark);
      border-radius: 30px;
      padding: 0.4rem 1.2rem;
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      margin-right: 0.5rem;
    }
    
    .hero-badge i {
      color: var(--color-accent);
      margin-right: 6px;
    }
    
    .data-highlight {
      font-family: var(--font-mono);
      font-weight: 700;
      color: var(--color-accent);
    }
    
    /* 卡片系统 */
    .card-custom {
      background: var(--color-card-bg);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
    }
    
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    
    .feature-icon {
      width: 64px;
      height: 64px;
      background: rgba(10, 31, 63, 0.05);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.2rem;
    }
    
    .feature-icon i {
      font-size: 2rem;
      color: var(--color-accent);
    }
    
    /* 场景卡片 */
    .scenario-card .card-img-top {
      height: 180px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
    }
    
    /* 案例卡片 */
    .case-logo {
      filter: grayscale(100%);
      transition: filter 0.3s;
      height: 32px;
      margin-bottom: 1rem;
    }
    
    .card-custom:hover .case-logo {
      filter: grayscale(0%);
    }
    
    .case-quote {
      font-style: italic;
      color: var(--color-text-muted);
      border-left: 4px solid var(--color-accent);
      padding-left: 1rem;
    }
    
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--color-success);
    }
    
    /* 手风琴 */
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--color-accent);
      box-shadow: none;
      border-bottom: 2px solid var(--color-accent);
    }
    
    .accordion-button:focus {
      border-color: var(--color-accent);
      box-shadow: none;
    }
    
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--color-border);
    }
    
    /* 价格卡 */
    .pricing-card {
      border-radius: var(--radius-card);
      transition: transform 0.3s;
    }
    
    .pricing-card.recommended {
      transform: scale(1.03);
      border: 2px solid var(--color-accent);
      position: relative;
    }
    
    .recommended-badge {
      background: var(--color-accent);
      color: white;
      font-size: 0.8rem;
      padding: 0.25rem 1rem;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    
    .price-amount {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
    }
    
    /* CTA 区域 */
    #cta {
      background-color: var(--color-accent);
    }
    
    /* 页脚 */
    footer {
      background-color: var(--color-footer-bg);
      color: rgba(255,255,255,0.85);
    }
    
    footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      transition: color 0.2s;
    }
    
    footer a:hover {
      color: white;
    }
    
    footer h5 {
      color: white;
      font-weight: 600;
      margin-bottom: 1rem;
    }
    
    /* 响应式 */
    @media (max-width: 768px) {
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.75rem;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 0 0 12px 12px;
        box-shadow: 0 8px 16px rgba(0,0,0,0.1);
      }
      #hero .row {
        flex-direction: column-reverse;
      }
      .hero-image {
        margin-bottom: 2rem;
      }
    }