/* roulang page: index */
:root {
      --brand-primary: #165DFF;
      --brand-hover: #0E42D2;
      --brand-accent: #00B42A;
      --brand-cyan: #0FC6C2;
      --brand-dark: #0F172A;
      --brand-dark-card: #1E293B;
      --text-main: #1D2129;
      --text-muted: #4E5969;
      --text-light: #86909C;
      --bg-page: #F7F8FA;
      --bg-card: #FFFFFF;
      --border-color: #E5E6EB;
      --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(22, 93, 255, 0.12);
      --radius-base: 12px;
      --radius-pill: 999px;
      --transition-smooth: all 0.28s ease-in-out;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a { text-decoration: none; color: inherit; transition: var(--transition-smooth); }
    img { max-width: 100%; height: auto; display: block; }

    /* 顶部双行导航系统 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .header-top {
      padding: 12px 0;
      border-bottom: 1px solid rgba(229, 230, 235, 0.6);
    }
    .brand-logo {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--brand-primary);
      display: inline-flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }
    .header-pills-bar {
      padding: 8px 0;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .header-pills-bar::-webkit-scrollbar { display: none; }
    .nav-pill-item {
      display: inline-block;
      padding: 6px 18px;
      margin-right: 8px;
      border-radius: var(--radius-pill);
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      background: transparent;
      border: 1px solid transparent;
    }
    .nav-pill-item:hover, .nav-pill-item.active {
      color: var(--brand-primary);
      background: rgba(22, 93, 255, 0.08);
      border-color: rgba(22, 93, 255, 0.2);
    }

    /* 核心排版组件 */
    .section-wrap {
      padding: 85px 0;
      position: relative;
    }
    .section-bg-white { background-color: var(--bg-card); }
    .section-bg-light { background-color: var(--bg-page); }
    .section-bg-dark { background-color: var(--brand-dark); color: #F8FAFC; }

    .section-header-block {
      max-width: 820px;
      margin: 0 auto 50px auto;
      text-align: center;
    }
    .section-subtag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--brand-primary);
      background: rgba(22, 93, 255, 0.1);
      border-radius: var(--radius-pill);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 18px;
    }
    .section-bg-dark .section-title { color: #FFFFFF; }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin: 0;
    }
    .section-bg-dark .section-desc { color: #94A3B8; }

    /* 卡片通用系统 */
    .custom-card {
      background: var(--bg-card);
      border-radius: var(--radius-base);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      height: 100%;
    }
    .custom-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(22, 93, 255, 0.3);
    }

    /* 按钮规范 */
    .btn-brand-primary {
      background-color: var(--brand-primary);
      color: #FFFFFF;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 10px 26px;
      border: 1px solid var(--brand-primary);
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-brand-primary:hover {
      background-color: var(--brand-hover);
      color: #FFFFFF;
      border-color: var(--brand-hover);
      box-shadow: 0 4px 12px rgba(22, 93, 255, 0.35);
    }
    .btn-brand-outline {
      background-color: transparent;
      color: var(--brand-primary);
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      border: 1px solid var(--brand-primary);
      transition: var(--transition-smooth);
    }
    .btn-brand-outline:hover {
      background-color: rgba(22, 93, 255, 0.08);
      color: var(--brand-hover);
    }

    /* 1. 首屏轮播Banner */
    .hero-banner-sec {
      position: relative;
      background: linear-gradient(135deg, #EFF4FE 0%, #FFFFFF 100%);
      padding: 60px 0 70px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .carousel-item-inner {
      padding: 20px 0;
    }
    .hero-h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0B2559;
      margin-bottom: 24px;
    }
    .hero-intro {
      font-size: 1.12rem;
      color: #334155;
      line-height: 1.8;
      margin-bottom: 30px;
    }
    .hero-trust-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 36px;
      padding-top: 24px;
      border-top: 1px solid rgba(22, 93, 255, 0.15);
    }
    .trust-tag-item {
      font-size: 0.9rem;
      color: #475569;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-weight: 500;
    }
    .hero-visual-frame {
      position: relative;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(15, 23, 42, 0.12);
      border: 4px solid #FFFFFF;
    }

    /* 2. 技术参数与架构区 */
    .tech-spec-badge {
      display: inline-block;
      padding: 4px 10px;
      background: #E8FFEA;
      color: #00B42A;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .tech-list-row {
      display: flex;
      gap: 16px;
      margin-bottom: 20px;
      align-items: flex-start;
    }
    .tech-icon-circle {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: rgba(22, 93, 255, 0.1);
      color: var(--brand-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-size: 1.2rem;
    }

    /* 3. KPI 看板 */
    .kpi-card {
      padding: 30px 24px;
      background: #FFFFFF;
      border-radius: var(--radius-base);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .kpi-num {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--brand-primary);
      line-height: 1.1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }
    .kpi-tag {
      font-size: 0.8rem;
      padding: 2px 8px;
      border-radius: 4px;
      background: rgba(0, 180, 42, 0.1);
      color: var(--brand-accent);
      font-weight: 600;
      display: inline-block;
      margin-bottom: 10px;
    }

    /* 4. 六大核心优势 */
    .adv-icon-wrapper {
      width: 56px;
      height: 56px;
      border-radius: 14px;
      background: rgba(22, 93, 255, 0.08);
      color: var(--brand-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      transition: var(--transition-smooth);
    }
    .custom-card:hover .adv-icon-wrapper {
      background: var(--brand-primary);
      color: #FFFFFF;
    }

    /* 6. 深色对比板块 */
    .contrast-box {
      border-radius: var(--radius-base);
      padding: 32px;
      height: 100%;
    }
    .contrast-box-negative {
      background: rgba(255, 255, 255, 0.04);
      border: 1px dashed #334155;
    }
    .contrast-box-positive {
      background: var(--brand-dark-card);
      border: 1px solid rgba(15, 198, 194, 0.35);
      position: relative;
    }

    /* 8. 里程碑时间轴 */
    .timeline-milestone-step {
      position: relative;
      padding: 20px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-base);
    }
    .timeline-dot {
      width: 32px;
      height: 32px;
      background: var(--brand-primary);
      color: #FFFFFF;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 12px;
    }

    /* FAQ 交互 */
    .accordion-button:not(.collapsed) {
      color: var(--brand-primary);
      background-color: rgba(22, 93, 255, 0.06);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: rgba(22, 93, 255, 0.3);
      box-shadow: none;
    }
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: 10px !important;
      margin-bottom: 12px;
      overflow: hidden;
    }

    /* 综合商业页脚 */
    .site-footer {
      background: #0B132B;
      color: #94A3B8;
      padding: 70px 0 30px 0;
      border-top: 1px solid #1E293B;
      font-size: 0.95rem;
    }
    .site-footer h5 {
      color: #FFFFFF;
      font-weight: 700;
      margin-bottom: 22px;
      font-size: 1.1rem;
    }
    .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 rgba(148, 163, 184, 0.15);
      padding-top: 25px;
      margin-top: 50px;
      font-size: 0.88rem;
    }

    /* 响应式调整 */
    @media (max-width: 991px) {
      .hero-h1 { font-size: 2.2rem; }
      .section-title { font-size: 1.8rem; }
      .section-wrap { padding: 60px 0; }
    }
    @media (max-width: 767px) {
      .hero-h1 { font-size: 1.85rem; }
      .hero-trust-bar { gap: 12px; }
      .kpi-num { font-size: 2.3rem; }
      .btn-brand-primary, .btn-brand-outline { width: 100%; justify-content: center; }
      .header-actions { display: none !important; }
    }