/* roulang page: index */
:root {
      --primary-color: #0F5B47;
      --primary-dark: #0A3F31;
      --primary-light: #167A60;
      --accent-color: #FF6B35;
      --accent-hover: #E85520;
      --dark-surface: #111827;
      --dark-card: #1F2937;
      --light-surface: #F8FAFC;
      --border-color: #E2E8F0;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --font-stack: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Inter", -apple-system, sans-serif;
      --card-radius: 12px;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-stack);
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    /* 顶部服务条与导航 */
    .site-topbar {
      background-color: var(--dark-surface);
      color: #94A3B8;
      font-size: 13px;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .site-navbar {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1020;
      padding: 12px 0;
    }

    .brand-logo-text {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-color);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }

    .nav-search-input {
      background-color: #F1F5F9;
      border: 1px solid #CBD5E1;
      border-radius: 6px;
      font-size: 13px;
      padding: 5px 12px;
      color: var(--text-main);
      width: 170px;
      transition: all 0.2s ease;
    }

    .nav-search-input:focus {
      outline: none;
      border-color: var(--primary-color);
      background-color: #FFFFFF;
      width: 210px;
    }

    .nav-link {
      font-weight: 500;
      font-size: 15px;
      color: #334155 !important;
      padding: 8px 14px !important;
      border-radius: 6px;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary-color) !important;
      background-color: rgba(15, 91, 71, 0.06);
    }

    /* 按钮与徽章 */
    .btn-main-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
      color: #FFFFFF !important;
      padding: 12px 28px;
      border-radius: 8px;
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      box-shadow: 0 4px 14px rgba(15, 91, 71, 0.25);
    }

    .btn-main-primary:hover {
      background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(15, 91, 71, 0.35);
    }

    .btn-main-accent {
      background-color: var(--accent-color);
      color: #FFFFFF !important;
      padding: 12px 28px;
      border-radius: 8px;
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .btn-main-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 107, 53, 0.3);
    }

    .btn-main-outline {
      border: 1.5px solid rgba(255, 255, 255, 0.4);
      color: #FFFFFF !important;
      padding: 11px 26px;
      border-radius: 8px;
      font-weight: 600;
      background: transparent;
    }

    .btn-main-outline:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: #FFFFFF;
    }

    .badge-soft-primary {
      background-color: rgba(15, 91, 71, 0.1);
      color: var(--primary-color);
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .badge-soft-accent {
      background-color: rgba(255, 107, 53, 0.12);
      color: var(--accent-color);
      font-weight: 600;
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 13px;
    }

    /* 板块通用 */
    section {
      padding: 85px 0;
      position: relative;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
      position: relative;
    }

    .section-title::after {
      content: "";
      display: block;
      width: 48px;
      height: 4px;
      background-color: var(--accent-color);
      border-radius: 2px;
      margin-top: 12px;
    }

    .section-title-center::after {
      margin-left: auto;
      margin-right: auto;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      max-width: 820px;
    }

    .card-custom {
      background: #FFFFFF;
      border-radius: var(--card-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      overflow: hidden;
      height: 100%;
    }

    .card-custom:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #CBD5E1;
    }

    /* 首屏轮播 */
    .hero-carousel .carousel-item {
      min-height: 560px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.82) 55%, rgba(15, 23, 42, 0.45) 100%);
      display: flex;
      align-items: center;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 800;
      color: #FFFFFF;
      line-height: 1.25;
      margin-bottom: 20px;
    }

    .hero-snippet {
      background-color: rgba(15, 23, 42, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 8px;
      padding: 16px 20px;
      font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
      font-size: 13px;
      color: #38BDF8;
      margin-top: 24px;
    }

    /* 流程连接线 */
    .process-step-num {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #FFFFFF;
      font-weight: 700;
      font-size: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      box-shadow: 0 0 0 6px rgba(15, 91, 71, 0.15);
    }

    /* 深色架构板块 */
    .dark-section {
      background-color: var(--dark-surface);
      color: #F8FAFC;
    }

    .dark-section .section-title {
      color: #FFFFFF;
    }

    .arch-code-window {
      background: #0B1120;
      border: 1px solid #334155;
      border-radius: 12px;
      padding: 24px;
      font-family: monospace;
      font-size: 14px;
      color: #94A3B8;
    }

    /* 统计卡片 */
    .stat-number {
      font-size: 44px;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1;
      margin-bottom: 8px;
      font-family: "Inter", sans-serif;
    }

    /* 页脚 */
    footer {
      background-color: #0B0F19;
      color: #94A3B8;
      font-size: 14px;
      padding: 60px 0 30px;
      border-top: 1px solid #1E293B;
    }

    footer h5 {
      color: #F1F5F9;
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    footer ul {
      list-style: none;
      padding: 0;
    }

    footer ul li {
      margin-bottom: 10px;
    }

    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin: 40px 0 24px;
    }

    @media (max-width: 991px) {
      .hero-title {
        font-size: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .hero-carousel .carousel-item {
        min-height: 480px;
      }
    }