/* roulang page: index */
:root {
      --bg-base: #0F1115;
      --bg-surface: #181B22;
      --bg-card: #20242D;
      --bg-alt: #13151A;
      --primary: #00FF87;
      --primary-dim: rgba(0, 255, 135, 0.15);
      --secondary: #60EFFF;
      --accent-orange: #FF5E3A;
      --text-main: #E6EDF3;
      --text-muted: #8B949E;
      --text-sub: #ADBAC7;
      --border-color: rgba(255, 255, 255, 0.08);
      --border-hover: #00FF87;
      --radius-sm: 6px;
      --radius-md: 12px;
      --font-stack: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --container-max: 1280px;
    }

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

    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.65;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      outline: none;
      transition: all 0.2s ease;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部系统栏 */
    .sys-topbar {
      background: #090B0E;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--text-muted);
      padding: 6px 0;
    }
    .sys-topbar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .sys-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--primary);
    }
    .sys-badge::before {
      content: '';
      width: 6px;
      height: 6px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
    }
    .sys-links {
      display: flex;
      gap: 16px;
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(15, 17, 21, 0.85);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: #fff;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      border: 2px solid var(--primary);
      border-radius: 4px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .logo-icon::after {
      content: '';
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 2px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-sub);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      transition: all 0.25s ease;
    }
    .btn-primary {
      background: var(--primary);
      color: #05140C;
    }
    .btn-primary:hover {
      background: #33ff9f;
      box-shadow: 0 0 20px rgba(0, 255, 135, 0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-dim);
    }

    /* 斜切 Hero (按活力品牌规范) */
    .hero-section {
      position: relative;
      background: var(--bg-alt);
      padding: 90px 0 130px;
      clip-path: polygon(0 0, 100% 0, 100% 94%, 0 100%);
      border-bottom: 2px solid var(--primary);
      background-image: linear-gradient(rgba(15, 17, 21, 0.88), rgba(15, 17, 21, 0.95)), url('/assets/images/d1ec1b5c9ae6208f.webp');
      background-size: cover;
      background-position: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 46px;
      line-height: 1.18;
      font-weight: 800;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-content h1 span {
      background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 16px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 620px;
    }
    .hero-meta-bar {
      display: flex;
      gap: 20px;
      align-items: center;
      margin-bottom: 36px;
    }
    .broadcast-card {
      background: rgba(24, 27, 34, 0.9);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      backdrop-filter: blur(10px);
    }
    .broadcast-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
      border-bottom: 1px solid var(--border-color);
      padding-bottom: 12px;
    }
    .live-tag {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent-orange);
      display: flex;
      align-items: center;
      gap: 6px;
      text-transform: uppercase;
    }
    .live-tag::before {
      content: '';
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent-orange);
      box-shadow: 0 0 8px var(--accent-orange);
    }
    .countdown-box {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px;
      margin: 20px 0;
      text-align: center;
    }
    .countdown-unit {
      background: #0F1115;
      padding: 12px 6px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255,255,255,0.04);
    }
    .countdown-num {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: block;
      font-family: monospace;
    }
    .countdown-lbl {
      font-size: 11px;
      color: var(--text-muted);
    }

    /* 板块通用布局 */
    .section-wrap {
      padding: 85px 0;
      position: relative;
    }
    .section-wrap.alt-bg {
      background-color: var(--bg-alt);
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-tag {
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      display: inline-block;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }
    .section-intro {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 680px;
      line-height: 1.7;
    }

    /* 卡片体系 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .base-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      flex-direction: column;
    }
    .base-card:hover {
      border-color: var(--primary);
      box-shadow: 0 10px 30px rgba(0, 255, 135, 0.1);
      transform: translateY(-3px);
    }
    .card-thumb {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .card-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .card-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 10px;
      color: #fff;
    }
    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex: 1;
    }

    /* 架构拓扑区块 (#overview) */
    .topo-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .topo-metrics {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .metric-badge {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 16px;
    }
    .metric-val {
      font-size: 26px;
      font-weight: 700;
      color: var(--secondary);
      font-family: monospace;
      margin-bottom: 4px;
    }
    .metric-name {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 渲染解构流程 (#philosophy) */
    .pipeline-band {
      background: linear-gradient(180deg, #13151A 0%, #090A0D 100%);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 90px 0;
    }
    .pipeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
      position: relative;
    }
    .pipeline-step-item {
      background: rgba(24, 27, 34, 0.8);
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius-md);
      position: relative;
    }
    .step-idx {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
      font-family: monospace;
    }

    /* 关键指标带状条 (#metrics) */
    .metrics-bar {
      background: #08090C;
      border-top: 1px solid rgba(255,255,255,0.06);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 50px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      text-align: center;
    }
    .huge-num {
      font-size: 42px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
      font-family: monospace;
    }
    .metric-caption {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 手风琴 FAQ (#faq) */
    .accordion-group {
      max-width: 860px;
      margin: 0 auto;
    }
    .accordion-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .accordion-trigger {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      background: transparent;
      color: #fff;
      font-size: 16px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-trigger:hover {
      color: var(--primary);
    }
    .accordion-symbol {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.2s ease;
    }
    .accordion-content {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }
    .accordion-item.active .accordion-content {
      display: block;
    }
    .accordion-item.active .accordion-symbol {
      transform: rotate(45px);
    }

    /* 合作伙伴墙 (#partners) */
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
    }
    .partner-chip {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 24px 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      font-weight: 600;
      color: var(--text-sub);
      font-size: 14px;
      letter-spacing: 0.5px;
    }

    /* 转化区 (#cta) */
    .cta-banner {
      background: linear-gradient(135deg, rgba(0, 255, 135, 0.1) 0%, rgba(96, 239, 255, 0.05) 100%), #14171E;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 60px 48px;
      text-align: center;
      position: relative;
    }
    .cta-banner h2 {
      font-size: 34px;
      margin-bottom: 16px;
    }
    .cta-banner p {
      max-width: 600px;
      margin: 0 auto 30px;
      color: var(--text-muted);
    }
    .cta-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
    }

    /* 页脚 */
    .site-footer {
      background: #080A0D;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      font-size: 14px;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 15px;
      margin-bottom: 16px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .card-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .topo-wrap { grid-template-columns: 1fr; }
      .partner-grid { grid-template-columns: repeat(3, 1fr); }
      .pipeline-steps { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .sys-topbar { display: none; }
      .hero-content h1 { font-size: 34px; }
      .card-grid-3, .card-grid-2, .card-grid-4 { grid-template-columns: 1fr; }
      .pipeline-steps { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
      .cta-actions { flex-direction: column; }
    }