/* roulang page: index */
/* 设计变量与主题规范 */
    :root {
      --primary-blue: #1A56DB;
      --primary-blue-hover: #1E40AF;
      --accent-cyan: #06B6D4;
      --accent-orange: #F97316;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark-navy: #0F172A;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light-muted: #94A3B8;
      --border-color: #E2E8F0;
      --border-focus: #BFDBFE;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.02);
      --shadow-hover: 0 20px 30px -10px rgba(26, 86, 219, 0.12), 0 10px 15px -3px rgba(15, 23, 42, 0.06);
      --transition-standard: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* 基础通用重置 */
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-standard);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 顶部服务状态条 */
    .top-status-bar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.8125rem;
      color: var(--text-muted);
      padding: 6px 0;
    }
    .status-indicator {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: #10B981;
      margin-right: 6px;
      box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
      animation: pulseGreen 2s infinite;
    }
    @keyframes pulseGreen {
      0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.5); }
      70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
      100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }

    /* 分段标签导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.25rem;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .brand-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.1rem;
    }
    
    /* 分段芯片导航控件 (Segmented Tab Chips) */
    .nav-chip-container {
      background-color: #EEF2F6;
      padding: 4px;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
    }
    .nav-chip-item {
      padding: 6px 14px;
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 20px;
      transition: var(--transition-standard);
      white-space: nowrap;
    }
    .nav-chip-item:hover {
      color: var(--primary-blue);
      background-color: rgba(255, 255, 255, 0.6);
    }
    .nav-chip-item.active {
      background-color: #FFFFFF;
      color: var(--primary-blue);
      font-weight: 600;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    }

    /* 自定义按钮样式 */
    .btn-custom-primary {
      background-color: var(--primary-blue);
      color: #ffffff;
      border: 1px solid transparent;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9375rem;
      transition: var(--transition-standard);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-custom-primary:hover {
      background-color: var(--primary-blue-hover);
      color: #ffffff;
      box-shadow: 0 6px 16px rgba(26, 86, 219, 0.28);
      transform: translateY(-2px);
    }
    .btn-custom-outline {
      background-color: transparent;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9375rem;
      transition: var(--transition-standard);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-custom-outline:hover {
      background-color: #FFFFFF;
      border-color: var(--primary-blue);
      color: var(--primary-blue);
      transform: translateY(-2px);
    }
    .btn-custom-accent {
      background: linear-gradient(135deg, var(--accent-orange), #EA580C);
      color: #ffffff;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 1rem;
      transition: var(--transition-standard);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-custom-accent:hover {
      box-shadow: 0 8px 20px rgba(234, 88, 12, 0.35);
      transform: translateY(-2px);
      color: #ffffff;
    }

    /* 统一 Section 结构样式 */
    .section-wrap {
      padding: 85px 0;
      position: relative;
    }
    .section-wrap.bg-alt {
      background-color: #FFFFFF;
    }
    .section-wrap.bg-dark-section {
      background-color: var(--bg-dark-navy);
      color: #F8FAFC;
    }
    .section-header {
      max-width: 780px;
      margin: 0 auto 50px auto;
      text-align: center;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      background-color: #EFF6FF;
      color: var(--primary-blue);
      font-size: 0.8125rem;
      font-weight: 700;
      border-radius: 20px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
    }
    .section-tag.dark-mode {
      background-color: rgba(6, 182, 212, 0.15);
      color: var(--accent-cyan);
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 800;
      letter-spacing: -0.6px;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .section-title.text-white {
      color: #FFFFFF !important;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.75;
      margin: 0;
    }
    .section-desc.text-light {
      color: var(--text-light-muted) !important;
    }

    /* 现代卡片设计与阴影系统 */
    .modern-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-md);
      transition: var(--transition-standard);
      height: 100%;
      position: relative;
    }
    .modern-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--border-focus);
      transform: translateY(-4px);
    }
    .modern-card.dark-card {
      background: #1E293B;
      border-color: #334155;
      color: #F8FAFC;
    }
    .modern-card.dark-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: 0 15px 35px rgba(6, 182, 212, 0.12);
    }

    /* 板块 1：Hero 区 (API / 协议级终端视角 + 仿真控制台视窗) */
    .hero-section {
      padding: 70px 0 90px 0;
      background: radial-gradient(circle at top right, rgba(239, 246, 255, 0.8) 0%, rgba(248, 250, 252, 1) 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -1px;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-h1 span.highlight {
      background: linear-gradient(120deg, var(--primary-blue), #2563EB);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.125rem;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 30px;
    }
    .hero-terminal-card {
      background: #0B1120;
      border-radius: var(--radius-md);
      border: 1px solid #1E293B;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35);
      color: #94A3B8;
      font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
      font-size: 0.875rem;
      overflow: hidden;
    }
    .terminal-header {
      background: #020617;
      padding: 10px 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid #1E293B;
    }
    .terminal-dots {
      display: flex;
      gap: 6px;
    }
    .terminal-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .terminal-body {
      padding: 20px;
      line-height: 1.6;
    }
    .metric-bubble {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-sm);
      padding: 12px;
      margin-top: 15px;
    }

    /* 指标对比卡片与状态条 */
    .ping-badge-success {
      background-color: #ECFDF5;
      color: #059669;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }
    .ping-badge-danger {
      background-color: #FEF2F2;
      color: #DC2626;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }

    /* 对比表格重构 */
    .compare-table {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }
    .compare-table th {
      background-color: #F8FAFC;
      padding: 16px 20px;
      font-weight: 700;
      color: var(--text-main);
      border-bottom: 2px solid var(--border-color);
    }
    .compare-table td {
      padding: 18px 20px;
      border-bottom: 1px solid var(--border-color);
      color: var(--text-muted);
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }

    /* 统计条 KPI Block */
    .kpi-num {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--primary-blue);
      line-height: 1;
      margin-bottom: 8px;
    }
    .kpi-label {
      font-size: 0.9375rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 手风琴 Accordion 样式定制 */
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm) !important;
      margin-bottom: 14px;
      background: #FFFFFF;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .accordion-button {
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      padding: 18px 24px;
      background: #FFFFFF;
    }
    .accordion-button:not(.collapsed) {
      background-color: #EFF6FF;
      color: var(--primary-blue);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--border-focus);
    }
    .accordion-body {
      padding: 20px 24px;
      color: var(--text-muted);
      line-height: 1.8;
      font-size: 0.95rem;
    }

    /* 底部悬浮转化条 Sticky Floating Bar */
    .sticky-floating-cta {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 1020;
      width: calc(100% - 40px);
      max-width: 1040px;
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 40px;
      padding: 12px 24px;
      box-shadow: 0 20px 35px -5px rgba(0, 0, 0, 0.4);
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: #FFFFFF;
      transition: var(--transition-standard);
    }
    .sticky-floating-cta.hide {
      transform: translate(-50%, 150%);
      opacity: 0;
      pointer-events: none;
    }

    /* 页脚 Footnotes & Trust Signal */
    .site-footer {
      background-color: #0B1120;
      color: #94A3B8;
      padding: 70px 0 30px 0;
      border-top: 1px solid #1E293B;
      font-size: 0.9375rem;
    }
    .footer-heading {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .footer-links-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links-list li {
      margin-bottom: 12px;
    }
    .footer-links-list a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }
    .footer-bottom-bar {
      border-top: 1px solid #1E293B;
      padding-top: 25px;
      margin-top: 50px;
      font-size: 0.8125rem;
      color: #64748B;
    }

    /* 响应式断点适配 */
    @media (max-width: 991.98px) {
      .hero-h1 { font-size: 2.2rem; }
      .section-wrap { padding: 60px 0; }
      .section-title { font-size: 1.75rem; }
      .nav-chip-container { display: none; }
      .sticky-floating-cta {
        flex-direction: column;
        border-radius: var(--radius-md);
        gap: 12px;
        padding: 16px;
        text-align: center;
      }
    }
    @media (max-width: 575.98px) {
      .hero-h1 { font-size: 1.85rem; }
      .kpi-num { font-size: 2.1rem; }
      .compare-table-wrapper { overflow-x: auto; }
      .compare-table { min-width: 540px; }
    }