/* roulang page: index */
:root {
      --primary-deep: #0B2B26;
      --accent-gold: #C5923C;
      --bg-warm: #F5F3EE;
      --emphasis-green: #1F4F46;
      --text-main: #1E1E1E;
      --text-muted: #5C5C5C;
      --border-light: #D9D3C7;
      --white: #FFFFFF;
      --dark-footer: #1E1E1E;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --radius-sm: 4px;
      --radius-card: 6px;
      --shadow-img: 0 4px 12px rgba(0,0,0,0.04);
      --transition: 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-warm);
      color: var(--text-main);
      font-size: 16px;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-stack);
      font-weight: 600;
      margin-top: 0;
    }
    a {
      color: var(--accent-gold);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: var(--primary-deep);
      text-decoration: none;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 按钮系统 */
    .btn-primary {
      background-color: var(--accent-gold);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: background-color var(--transition), color var(--transition);
      display: inline-block;
      text-align: center;
      line-height: 1.4;
      border: 1px solid transparent;
    }
    .btn-primary:hover {
      background-color: var(--primary-deep);
      color: #F5F3EE;
      border-color: var(--primary-deep);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary-deep);
      border: 1px solid var(--primary-deep);
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition);
      display: inline-block;
      line-height: 1.4;
    }
    .btn-outline:hover {
      background-color: var(--primary-deep);
      color: white;
      border-color: var(--primary-deep);
    }
    .btn-white {
      background: white;
      color: var(--primary-deep);
      border: 1px solid white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      transition: all var(--transition);
    }
    .btn-white:hover {
      background-color: var(--primary-deep);
      color: white;
      border-color: var(--primary-deep);
    }
    /* 导航分屏布局 */
    .site-header {
      background-color: white;
      height: 64px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 40;
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
    }
    .header-inner {
      display: flex;
      width: 100%;
      height: 100%;
      align-items: center;
      justify-content: space-between;
    }
    .brand-area {
      display: flex;
      align-items: center;
      gap: 24px;
      padding-left: 20px;
    }
    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .logo .ding-icon {
      font-size: 26px;
      color: var(--accent-gold);
      font-weight: 400;
    }
    .logo .kaiyuan {
      color: var(--accent-gold);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
      font-size: 14px;
      font-weight: 500;
    }
    .nav-links a {
      color: var(--text-muted);
      transition: color var(--transition);
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--accent-gold);
    }
    .right-cta {
      background: linear-gradient(105deg, #0B2B26 0%, #1F4F46 100%);
      height: 100%;
      display: flex;
      align-items: center;
      padding: 0 28px;
      margin-left: auto;
      position: relative;
      overflow: hidden;
    }
    .right-cta::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: repeating-linear-gradient(45deg, rgba(197,146,60,0.15) 0px, rgba(197,146,60,0.15) 2px, transparent 2px, transparent 8px);
      pointer-events: none;
    }
    .right-cta .btn-nav {
      background: var(--accent-gold);
      color: white;
      padding: 8px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      position: relative;
      z-index: 2;
    }
    /* 汉堡菜单 */
    .hamburger {
      display: none;
      font-size: 24px;
      color: var(--primary-deep);
    }
    @media (max-width: 840px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
        margin-left: 15px;
        cursor: pointer;
      }
      .right-cta {
        padding: 0 16px;
      }
    }
    .mobile-menu {
      display: none;
      position: absolute;
      top: 64px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 20px;
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 8px 12px rgba(0,0,0,0.05);
      z-index: 50;
    }
    .mobile-menu a {
      padding: 12px 0;
      border-bottom: 1px solid #f0ede8;
      color: var(--text-main);
      font-weight: 500;
    }
    .show-mobile {
      display: flex;
    }
    /* Hero 分屏 */
    .hero-split {
      display: flex;
      min-height: 580px;
      background-color: var(--bg-warm);
      margin-top: 0;
    }
    .hero-left {
      width: 50%;
      padding: 80px 40px 80px 20px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .hero-right {
      width: 50%;
      background: linear-gradient(135deg, #0B2B26 0%, #1F4F46 100%);
      position: relative;
      display: flex;
      align-items: flex-end;
      overflow: hidden;
    }
    .hero-right img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 0;
      opacity: 0.9;
      box-shadow: var(--shadow-img);
    }
    .hero-overlay-data {
      position: absolute;
      bottom: 25px;
      left: 20px;
      background: rgba(11, 43, 38, 0.85);
      color: white;
      padding: 12px 24px;
      border-radius: var(--radius-card);
      backdrop-filter: blur(4px);
      font-weight: 600;
      font-size: 18px;
      letter-spacing: 0.5px;
    }
    .tag {
      color: var(--accent-gold);
      font-size: 13px;
      letter-spacing: 2px;
      font-weight: 600;
      margin-bottom: 16px;
      text-transform: uppercase;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary-deep);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 90%;
    }
    .button-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    @media (max-width: 840px) {
      .hero-split {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100%;
      }
      .hero-left {
        padding: 50px 20px;
      }
      h1 {
        font-size: 36px;
      }
    }
    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    h2 {
      font-size: 34px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 48px;
    }
    /* 指标看板 */
    .dashboard-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: space-between;
    }
    .stat-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      flex: 1 1 220px;
      transition: all var(--transition);
    }
    .stat-card:hover {
      border-color: var(--accent-gold);
      box-shadow: 0 2px 0 0 var(--accent-gold);
      background: #FFFFFF;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 36px;
      font-weight: 700;
      color: var(--accent-gold);
    }
    .trend-up {
      color: #1F4F46;
      margin-left: 6px;
    }
    /* 服务矩阵错落卡片 */
    .services-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
    }
    .service-card {
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      flex: 1 1 300px;
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card.middle-card {
      margin-top: -16px;
      border-top: 3px solid var(--accent-gold);
    }
    .service-card:hover {
      border-color: var(--accent-gold);
      box-shadow: 0 2px 0 0 var(--accent-gold);
    }
    .icon-placeholder {
      width: 64px;
      height: 64px;
      background: var(--primary-deep);
      color: var(--accent-gold);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      border-radius: 6px;
      margin-bottom: 20px;
    }
    /* 对比卡片 */
    .compare-row {
      display: flex;
      gap: 24px;
      align-items: center;
    }
    .compare-card {
      flex: 1;
      padding: 32px;
      border-radius: var(--radius-card);
    }
    .before-card {
      background: #F0EDE8;
      border: 1px solid #D9D3C7;
    }
    .after-card {
      background: var(--primary-deep);
      color: white;
    }
    .arrow-icon {
      font-size: 32px;
      color: var(--accent-gold);
      margin: 0 16px;
    }
    @media (max-width: 768px) {
      .compare-row {
        flex-direction: column;
      }
      .arrow-icon {
        transform: rotate(90deg);
        margin: 12px 0;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      transition: background 0.2s;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }
    /* 表单 */
    .cta-section {
      background: var(--primary-deep);
      color: white;
      padding: 70px 0;
    }
    .cta-inner {
      display: flex;
      gap: 50px;
      align-items: center;
    }
    .form-input {
      background: white;
      border: 1px solid #D9D3C7;
      border-radius: var(--radius-sm);
      padding: 12px;
      margin-bottom: 16px;
    }
    .form-input:focus {
      border-color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .cta-inner {
        flex-direction: column;
      }
    }
    .footer-dark {
      background: #1E1E1E;
      color: #B0B0B0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: space-between;
    }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }