/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C62828;
      --secondary: #1D1D1D;
      --accent: #F4A261;
      --accent-light: #FFB703;
      --bg-light: #F9F9F9;
      --bg-white: #FFFFFF;
      --bg-gray: #F1F1F1;
      --text-main: #1D1D1D;
      --text-secondary: #555555;
      --text-muted: #777777;
      --text-light: #AAAAAA;
      --border-light: #E0E0E0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 0.25s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
      letter-spacing: 0;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 700;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    p {
      font-size: 16px;
      line-height: 1.8;
      color: var(--text-secondary);
    }
    .text-muted-custom {
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.6;
    }
    .section {
      padding: 80px 0;
      position: relative;
    }
    .section-title {
      text-align: center;
      margin-bottom: 1.5rem;
      color: var(--text-main);
    }
    .divider {
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--accent), transparent);
      margin: 0 auto 2.5rem auto;
      border-radius: 2px;
    }
    .bg-dark-section {
      background-color: var(--secondary);
    }
    .bg-light-section {
      background-color: var(--bg-light);
    }
    .bg-white-section {
      background-color: var(--bg-white);
    }
    /* 导航 */
    .navbar {
      background: var(--secondary);
      height: 64px;
      padding: 0;
      transition: background 0.3s, backdrop-filter 0.3s;
      z-index: 1020;
    }
    .navbar.scrolled {
      background: rgba(29,29,29,0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 20px;
      color: white !important;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo-icon {
      color: var(--accent);
      font-size: 24px;
    }
    .nav-link {
      color: #CCC !important;
      font-weight: 500;
      font-size: 15px;
      margin: 0 0.5rem;
      padding: 0.5rem 0.75rem !important;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link:focus {
      color: var(--accent) !important;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 70%;
    }
    .search-toggle {
      background: transparent;
      border: none;
      color: #CCC;
      font-size: 18px;
      cursor: pointer;
    }
    .search-box {
      background: #333;
      border: none;
      color: white;
      padding: 8px 16px;
      border-radius: 20px;
      width: 200px;
      outline: none;
    }
    .navbar-toggler {
      border-color: rgba(255,255,255,0.3);
    }
    .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(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    @media (max-width: 768px) {
      .navbar-collapse {
        background: var(--secondary);
        padding: 1rem;
        border-radius: 0 0 12px 12px;
      }
    }
    /* 按钮 */
    .btn-primary-custom {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.3s, transform 0.2s;
      position: relative;
      overflow: hidden;
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      color: white;
      transform: translateY(-1px);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s;
    }
    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
    }
    .btn-accent {
      background: var(--accent);
      color: var(--secondary);
      border: none;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: 0.3s;
    }
    .btn-accent:hover {
      background: var(--accent-light);
      color: #1D1D1D;
    }
    /* 卡片 */
    .card-custom {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      border: none;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-number.red {
      color: var(--primary);
    }
    .service-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
    }
    /* 对比卡片 */
    .compare-card {
      background: var(--bg-gray);
      border-radius: var(--radius-card);
      padding: 2rem;
    }
    .compare-card.wukong {
      background: white;
      border-left: 4px solid var(--primary);
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      background: white;
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: #FAFAFA;
      color: var(--text-main);
    }
    .accordion-item {
      border: none;
      margin-bottom: 1rem;
      border-radius: var(--radius-card) !important;
    }
    /* 表单 */
    .form-control-dark {
      background: #333;
      border: none;
      color: white;
      padding: 12px 16px;
      border-radius: var(--radius-input);
      transition: border 0.2s;
    }
    .form-control-dark:focus {
      border-bottom: 2px solid var(--accent);
      box-shadow: none;
      background: #3a3a3a;
    }
    footer a {
      color: #AAA;
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .section { padding: 50px 0; }
    }