/* roulang page: index */
:root {
      /* 主色系 */
      --primary-onyx: #1A1D23;
      --primary-amber: #D49B3E;
      --amber-hover: #B8832E;
      --secondary-slate: #2C3038;
      --warm-white: #F4F1EA;
      --data-teal: #0EA5A6;
      --alert-red: #C94A3E;
      
      /* 文字 */
      --text-dark: #1A1D23;
      --text-light: #F4F1EA;
      --text-muted: rgba(244, 241, 234, 0.7);
      --text-slate: #5A5E66;
      
      /* 圆角与阴影 */
      --radius-sm: 8px;
      --radius-chip: 20px;
      --radius-xs: 6px;
      --shadow-card: 0 2px 12px rgba(26,29,35,0.08);
      --shadow-hover: 0 8px 24px rgba(26,29,35,0.16);
      --transition-base: 0.25s ease;
      
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--text-dark);
      line-height: 1.8;
      font-size: 16px;
      margin: 0;
      padding-top: 64px;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      letter-spacing: -0.5px;
    }
    
    h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary-amber);
    }
    
    h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 1.2rem;
    }
    
    h3 {
      font-size: 24px;
      font-weight: 700;
    }
    
    .section-title {
      color: var(--primary-onyx);
      position: relative;
      display: inline-block;
      margin-bottom: 2.5rem;
    }
    
    .section-title.light {
      color: var(--warm-white);
    }
    
    .text-mono {
      font-family: var(--font-mono);
      font-weight: 600;
    }
    
    .text-amber {
      color: var(--primary-amber);
    }
    
    .text-teal {
      color: var(--data-teal);
    }
    
    .bg-onyx {
      background-color: var(--primary-onyx);
    }
    
    .bg-slate {
      background-color: var(--secondary-slate);
    }
    
    .bg-warm {
      background-color: var(--warm-white);
    }
    
    .bg-footer {
      background-color: #15171B;
    }
    
    /* 按钮重置 Bootstrap */
    .btn-custom {
      border-radius: var(--radius-sm);
      padding: 12px 28px;
      font-weight: 600;
      transition: var(--transition-base);
      border: none;
      font-size: 16px;
    }
    
    .btn-primary-custom {
      background-color: var(--primary-amber);
      color: var(--primary-onyx);
      border: 2px solid var(--primary-amber);
    }
    
    .btn-primary-custom:hover, .btn-primary-custom:focus {
      background-color: var(--amber-hover);
      border-color: var(--amber-hover);
      color: var(--primary-onyx);
      box-shadow: 0 4px 12px rgba(212,155,62,0.3);
    }
    
    .btn-outline-custom {
      background: transparent;
      color: var(--primary-amber);
      border: 2px solid var(--primary-amber);
    }
    
    .btn-outline-custom:hover, .btn-outline-custom:focus {
      background-color: var(--primary-amber);
      color: var(--primary-onyx);
      border-color: var(--primary-amber);
    }
    
    .btn-light-custom {
      background-color: transparent;
      color: var(--warm-white);
      border: 2px solid var(--warm-white);
    }
    .btn-light-custom:hover {
      background-color: var(--warm-white);
      color: var(--primary-onyx);
    }
    
    /* 导航栏 */
    .navbar {
      background-color: var(--primary-onyx);
      height: 64px;
      z-index: 1030;
      box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    }
    
    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-amber) !important;
      letter-spacing: 0.5px;
    }
    
    .nav-chip {
      background: transparent;
      color: var(--warm-white);
      border-radius: var(--radius-chip);
      padding: 6px 18px;
      font-size: 15px;
      font-weight: 500;
      margin: 0 4px;
      transition: var(--transition-base);
      text-decoration: none;
      display: inline-block;
    }
    
    .nav-chip:hover, .nav-chip.active {
      background-color: var(--secondary-slate);
      color: white;
    }
    
    .nav-chip.active {
      background-color: var(--primary-amber);
      color: var(--primary-onyx);
      font-weight: 600;
    }
    
    .navbar-toggler {
      border: none;
      color: var(--warm-white);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(244, 241, 234, 0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    
    .offcanvas {
      background-color: var(--primary-onyx);
    }
    
    /* Hero 区域 */
    .hero-section {
      background-color: var(--primary-onyx);
      min-height: 85vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    
    .hero-grid-bg {
      position: absolute;
      top:0; left:0; right:0; bottom:0;
      background-image: 
        linear-gradient(rgba(244,241,234,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(244,241,234,0.05) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
    }
    
    .data-preview-card {
      background-color: var(--secondary-slate);
      border-radius: var(--radius-sm);
      padding: 24px;
      box-shadow: var(--shadow-card);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    
    .mini-stat .number {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--data-teal);
    }
    .mini-stat .label {
      color: var(--warm-white);
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    
    /* 卡片系统 */
    .card-custom {
      background-color: var(--secondary-slate);
      border-radius: var(--radius-sm);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      border: none;
      color: white;
    }
    
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    .card-light {
      background-color: white;
      color: var(--text-dark);
      box-shadow: 0 4px 16px rgba(0,0,0,0.04);
    }
    
    .icon-wrap {
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-amber);
      font-size: 32px;
      margin-bottom: 16px;
      transition: var(--transition-base);
    }
    
    .card-custom:hover .icon-wrap {
      color: var(--data-teal);
      transform: scale(1.1);
    }
    
    .service-link {
      color: var(--primary-amber);
      text-decoration: none;
      font-weight: 500;
    }
    .service-link:hover {
      text-decoration: underline;
      color: var(--data-teal);
    }
    
    /* 对比区 */
    .compare-badge {
      font-size: 18px;
      font-weight: 700;
    }
    .traditional-side {
      background-color: rgba(201,74,62,0.08);
      border-left: 4px solid var(--alert-red);
    }
    .db-side {
      background-color: rgba(212,155,62,0.1);
      border-left: 4px solid var(--primary-amber);
    }
    
    /* 案例卡片 */
    .case-img {
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-sm) var(--radius-sm) 0 0;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-tag {
      background-color: var(--data-teal);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
    }
    
    /* FAQ 手风琴覆盖 */
    .accordion-button {
      background-color: var(--primary-onyx);
      color: var(--warm-white);
      font-weight: 500;
      border-radius: var(--radius-xs) !important;
      padding: 16px 20px;
      font-size: 16px;
    }
    .accordion-button:not(.collapsed) {
      background-color: var(--primary-onyx);
      color: var(--primary-amber);
      box-shadow: none;
    }
    .accordion-button::after {
      filter: brightness(0) invert(0.8);
    }
    .accordion-body {
      background-color: #3A3E47;
      color: var(--warm-white);
      font-size: 15px;
      line-height: 1.7;
    }
    
    /* 表单 */
    .form-control-custom {
      background-color: var(--secondary-slate);
      border: none;
      border-radius: var(--radius-sm);
      padding: 14px 18px;
      color: var(--warm-white);
      font-size: 16px;
    }
    .form-control-custom::placeholder {
      color: #8A8F98;
    }
    .form-control-custom:focus {
      background-color: #3A3E47;
      box-shadow: 0 0 0 2px var(--primary-amber);
      color: white;
    }
    
    /* 回到顶部 */
    .back-to-top {
      position: fixed;
      bottom: 24px;
      right: 24px;
      width: 44px;
      height: 44px;
      background-color: var(--primary-amber);
      color: var(--primary-onyx);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      z-index: 999;
      transition: var(--transition-base);
      box-shadow: 0 4px 12px rgba(0,0,0,0.25);
    }
    .back-to-top:hover {
      background-color: var(--amber-hover);
    }
    
    footer a {
      color: var(--warm-white);
      text-decoration: none;
      transition: var(--transition-base);
    }
    footer a:hover {
      color: var(--primary-amber);
    }
    
    /* 响应式调整 */
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      body { font-size: 15px; }
      .navbar-nav { gap: 8px; }
      .data-preview-card { grid-template-columns: 1fr; }
    }