/* roulang page: index */
:root {
      --primary-deep: #1E1E24;
      --primary-cta: #F85C3C;
      --cta-hover: #E04A2E;
      --bg-warm: #FAF9F7;
      --bg-card: #FFFFFF;
      --bg-hero-panel: #F0EFEC;
      --text-main: #1E1E24;
      --text-secondary: #5A5753;
      --text-muted: #8A8680;
      --border-light: #E8E6E1;
      --border-input: #D1CDC7;
      --shadow-sm: 0 4px 16px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --transition-base: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding-top: 76px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(250,249,247,0.92);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 1030;
      height: 76px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-brand {
      font-size: 22px;
      font-weight: 700;
      letter-spacing: -0.3px;
    }
    .logo-brand span {
      color: var(--primary-cta);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary-cta);
    }
    .cta-btn-nav {
      background: var(--primary-cta);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: background 0.2s, transform 0.15s;
      white-space: nowrap;
    }
    .cta-btn-nav:hover {
      background: var(--cta-hover);
      color: white;
      transform: scale(1.02);
    }
    .status-badge {
      background: #fff;
      color: #d32f2f;
      font-size: 12px;
      padding: 2px 8px;
      border-radius: 20px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background: #d32f2f;
      border-radius: 50%;
      display: inline-block;
    }
    .navbar-toggler {
      border: none;
      background: transparent;
      font-size: 24px;
      color: var(--primary-deep);
    }
    .mobile-menu {
      background: rgba(250,249,247,0.98);
      backdrop-filter: blur(8px);
      padding: 20px;
      border-radius: 0 0 16px 16px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    }
    /* Hero */
    .hero-section {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #FAF9F7 0%, #F0EFEC 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.5px;
      color: var(--primary-deep);
    }
    .hero-sub {
      font-size: 16px;
      color: var(--text-secondary);
      margin: 20px 0 32px;
      max-width: 480px;
    }
    .btn-group-hero {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary-custom {
      background: var(--primary-cta);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: var(--cta-hover);
      transform: scale(1.02);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline-custom:hover {
      background: var(--primary-deep);
      color: white;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .metric-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 20px 16px;
      box-shadow: var(--shadow-sm);
      border-top: 3px solid var(--primary-cta);
      transition: var(--transition-base);
    }
    .metric-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .metric-number {
      font-family: 'Inter', sans-serif;
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-deep);
    }
    .trend-up { color: #2e7d32; margin-left: 6px; }
    /* 通用区块 */
    .section-block {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .divider {
      height: 1px;
      background: #E0DDD8;
      margin: 24px 0 40px;
    }
    /* 核心优势 不等高网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: var(--transition-base);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 28px;
      color: var(--primary-cta);
      margin-bottom: 16px;
    }
    /* 服务矩阵 Z型 */
    .service-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      margin-bottom: 64px;
    }
    .service-img img {
      border-radius: 12px;
      width: 100%;
      height: auto;
      box-shadow: var(--shadow-sm);
    }
    .service-tags span {
      background: #F0EFEC;
      color: var(--primary-deep);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      margin-right: 8px;
    }
    /* 数据对比 */
    .compare-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .before-card, .after-card {
      padding: 24px;
      border-radius: var(--radius-card);
    }
    .before-card {
      background: #f2f0ed;
      border: 1px solid #ddd9d2;
    }
    .after-card {
      background: #fff7f5;
      border: 1px solid #fbc4b8;
    }
    .metric-compare {
      font-size: 28px;
      font-weight: 700;
    }
    /* FAQ */
    .accordion-button {
      background: #FAF9F7;
      font-weight: 600;
      font-size: 18px;
      color: var(--primary-deep);
      box-shadow: none;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-button:not(.collapsed) {
      background: white;
      color: var(--primary-cta);
    }
    .accordion-body {
      background: white;
      color: var(--text-secondary);
      font-size: 15px;
    }
    /* 表单 */
    .form-control {
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      padding: 12px 16px;
      background: white;
    }
    .form-control:focus {
      border-color: var(--primary-cta);
      box-shadow: 0 0 0 3px rgba(248,92,60,0.1);
    }
    .submit-btn {
      background: var(--primary-cta);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border: none;
      border-radius: var(--radius-btn);
      transition: 0.2s;
    }
    .submit-btn:hover {
      background: var(--cta-hover);
      transform: scale(1.02);
    }
    /* 页脚 */
    .footer-dark {
      background: #1E1E24;
      color: #A09B95;
      padding: 48px 0 24px;
    }
    .footer-dark a:hover {
      color: white;
    }
    @media (max-width: 992px) {
      .hero-grid, .service-item {
        grid-template-columns: 1fr;
      }
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .section-title { font-size: 28px; }
      .hero-title { font-size: 36px; }
      .features-grid, .compare-row { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .mobile-menu { display: block; }
    }