/* roulang page: index */
:root {
      --primary: #1D4ED8;
      --primary-hover: #1E40AF;
      --accent: #0284C7;
      --bg-page: #F8FAFC;
      --bg-surface: #FFFFFF;
      --bg-dark: #0F172A;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-sub: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-muted);
      line-height: 1.75;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.02em;
    }
    a { text-decoration: none; transition: var(--transition); color: inherit; }
    img { max-width: 100%; height: auto; display: block; }

    /* 顶部双行导航系统 */
    .site-header {
      background: #ffffff;
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .header-top {
      border-bottom: 1px solid var(--border-color);
      padding: 10px 0;
      font-size: 0.875rem;
    }
    .brand-logo {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary);
    }
    .brand-logo i {
      font-size: 1.6rem;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-tabs-bar {
      padding: 4px 0;
      background: #ffffff;
    }
    .channel-nav .nav-link {
      color: var(--text-muted);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 18px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-block;
    }
    .channel-nav .nav-link:hover,
    .channel-nav .nav-link.active {
      color: var(--primary);
      background: rgba(29, 78, 216, 0.06);
    }

    /* 基础区块与通用组件 */
    section {
      padding: 85px 0;
      position: relative;
    }
    .section-alt {
      background-color: #ffffff;
    }
    .section-header {
      margin-bottom: 52px;
    }
    .section-title {
      font-size: 2.15rem;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
      max-width: 760px;
      margin: 0 auto;
      line-height: 1.8;
    }
    .badge-soft {
      display: inline-flex;
      align-items: center;
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.825rem;
      font-weight: 600;
      background-color: rgba(2, 132, 199, 0.1);
      color: var(--accent);
      margin-bottom: 16px;
      gap: 6px;
    }
    .btn-main {
      background-color: var(--primary);
      color: #ffffff !important;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 14px rgba(29, 78, 216, 0.25);
    }
    .btn-main:hover {
      background-color: var(--primary-hover);
      border-color: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-outline-main {
      background-color: transparent;
      color: var(--primary) !important;
      font-weight: 600;
      padding: 12px 26px;
      border-radius: var(--radius-sm);
      border: 1.5px solid var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline-main:hover {
      background-color: rgba(29, 78, 216, 0.05);
      transform: translateY(-2px);
    }

    /* 卡片系统 */
    .glass-card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      height: 100%;
      padding: 32px 26px;
    }
    .glass-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(2, 132, 199, 0.35);
    }

    /* 板块1：双栏门户 Hero */
    .hero-portal {
      background: radial-gradient(circle at 15% 20%, rgba(29, 78, 216, 0.04) 0%, transparent 60%),
                  radial-gradient(circle at 85% 75%, rgba(2, 132, 199, 0.05) 0%, transparent 60%),
                  var(--bg-page);
      padding: 90px 0 80px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-portal h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
    }
    .hero-portal .lead-text {
      font-size: 1.08rem;
      color: var(--text-muted);
      line-height: 1.85;
      margin-bottom: 34px;
    }
    .portal-quick-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .quick-entry-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quick-entry-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .entry-icon-wrap {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 14px;
    }

    /* 板块2：痛点与解决方案对比 */
    .contrast-box {
      border-radius: var(--radius-md);
      padding: 32px 28px;
      height: 100%;
      border: 1px solid;
    }
    .contrast-box.pain {
      background: #FFF1F2;
      border-color: #FECDD3;
    }
    .contrast-box.solution {
      background: #EFF6FF;
      border-color: #BFDBFE;
    }

    /* 板块3：平台底座 */
    .engine-banner-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .param-chip {
      background: #F1F5F9;
      border-radius: var(--radius-sm);
      padding: 8px 14px;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-muted);
      display: inline-block;
      margin: 4px;
    }

    /* 板块4：六维核心优势 */
    .advantage-icon-pill {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(29, 78, 216, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      margin-bottom: 20px;
    }

    /* 板块5：三大产品矩阵 */
    .pricing-card {
      border-radius: var(--radius-lg);
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      padding: 36px 30px;
      transition: var(--transition);
      position: relative;
    }
    .pricing-card.featured {
      border-color: var(--primary);
      box-shadow: 0 12px 30px rgba(29, 78, 216, 0.12);
    }
    .pricing-card:hover {
      transform: translateY(-6px);
    }

    /* 板块6：深色工业案例 */
    .dark-narrative-section {
      background-color: var(--bg-dark);
      color: #E2E8F0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .dark-narrative-section h2, .dark-narrative-section h3, .dark-narrative-section h4 {
      color: #ffffff;
    }
    .terminal-window {
      background: #090D16;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 24px;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 0.85rem;
      line-height: 1.7;
      color: #94A3B8;
    }
    .terminal-dots span {
      display: inline-block;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      margin-right: 6px;
    }

    /* 板块7：用户故事时间轴 */
    .step-card {
      position: relative;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      height: 100%;
    }
    .step-badge {
      width: 38px;
      height: 38px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }

    /* 板块8：数据统计条 */
    .metrics-bar-section {
      background: linear-gradient(135deg, #1D4ED8 0%, #0369A1 100%);
      color: #ffffff;
      padding: 64px 0;
    }
    .metric-item-val {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 8px;
      letter-spacing: -0.03em;
    }
    .metric-item-lbl {
      font-size: 0.95rem;
      opacity: 0.9;
    }

    /* 板块9：制作人评价 */
    .quote-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      padding: 30px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }
    .quote-stars {
      color: #F59E0B;
      margin-bottom: 14px;
      font-size: 0.9rem;
    }

    /* 板块10：研发资讯 */
    .news-thumb-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      height: 100%;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .news-thumb-box:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .news-img-wrap {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .news-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .news-thumb-box:hover .news-img-wrap img {
      transform: scale(1.05);
    }
    .news-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
      justify-content: space-between;
    }

    /* 板块11：FAQ 手风琴 */
    .accordion-item {
      border: 1px solid var(--border-color);
      margin-bottom: 14px;
      border-radius: var(--radius-md) !important;
      overflow: hidden;
      background: #ffffff;
    }
    .accordion-button {
      font-weight: 700;
      color: var(--text-main);
      padding: 20px 24px;
      font-size: 1.05rem;
      background: #ffffff;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      color: var(--primary);
      background-color: #EFF6FF;
    }
    .accordion-body {
      padding: 22px 24px;
      color: var(--text-muted);
      line-height: 1.8;
      background-color: #ffffff;
    }

    /* 板块12：转化收口 */
    .cta-stage-card {
      background: linear-gradient(135deg, #FFFFFF 0%, #F0F7FF 100%);
      border: 1.5px solid #BFDBFE;
      border-radius: var(--radius-lg);
      padding: 56px 44px;
      box-shadow: var(--shadow-hover);
    }

    /* 页脚 */
    .site-footer {
      background-color: #0B1120;
      color: #94A3B8;
      padding-top: 72px;
      padding-bottom: 36px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .site-footer h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 20px;
    }
    .footer-links-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-links-list li {
      margin-bottom: 12px;
    }
    .footer-links-list a {
      color: #94A3B8;
      transition: var(--transition);
    }
    .footer-links-list a:hover {
      color: #ffffff;
      padding-left: 4px;
    }
    .footer-bottom {
      margin-top: 56px;
      padding-top: 28px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.85rem;
    }

    @media (max-width: 991.98px) {
      .hero-portal h1 { font-size: 2.15rem; }
      .portal-quick-grid { grid-template-columns: 1fr; }
      section { padding: 60px 0; }
      .section-title { font-size: 1.85rem; }
      .cta-stage-card { padding: 36px 20px; }
    }