/* roulang page: index */
:root {
      --qh-bg-base: #0D0F12;
      --qh-bg-surface: #14181D;
      --qh-bg-elevated: #1B2129;
      --qh-brand-neon: #00FF88;
      --qh-brand-cyan: #00E5FF;
      --qh-text-main: #E6EDF3;
      --qh-text-muted: #8B949E;
      --qh-border-line: rgba(255, 255, 255, 0.08);
      --qh-border-hover: rgba(0, 255, 136, 0.35);
      --qh-radius: 8px;
      --qh-shadow: 0 16px 36px rgba(0, 0, 0, 0.55);
      --qh-transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background-color: var(--qh-bg-base);
      color: var(--qh-text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--qh-transition);
    }

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

    /* 顶部双行联动导航 */
    .qh-header {
      position: sticky;
      top: 0;
      z-index: 1040;
      background: rgba(13, 15, 18, 0.92);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--qh-border-line);
    }

    .qh-header-topbar {
      background: #090B0D;
      font-size: 0.78rem;
      color: var(--qh-text-muted);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
      padding: 6px 0;
    }

    .qh-status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .qh-status-dot {
      width: 7px;
      height: 7px;
      background-color: var(--qh-brand-neon);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--qh-brand-neon);
    }

    .qh-main-nav {
      padding: 14px 0;
    }

    .qh-brand-title {
      font-size: 1.28rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qh-brand-logo-mark {
      width: 32px;
      height: 32px;
      border-radius: 6px;
      background: linear-gradient(135deg, var(--qh-brand-neon), var(--qh-brand-cyan));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0D0F12;
      font-weight: 900;
      font-size: 1rem;
    }

    .qh-nav-link {
      font-size: 0.92rem;
      color: var(--qh-text-muted);
      padding: 6px 14px;
      border-radius: 4px;
      font-weight: 500;
    }

    .qh-nav-link:hover, .qh-nav-link.active {
      color: #fff;
      background: rgba(255, 255, 255, 0.05);
    }

    .qh-btn-cta {
      background: var(--qh-brand-neon);
      color: #0D0F12;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 9px 20px;
      border-radius: var(--qh-radius);
      border: 1px solid var(--qh-brand-neon);
      transition: var(--qh-transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .qh-btn-cta:hover {
      background: #00e078;
      color: #000;
      box-shadow: 0 0 20px rgba(0, 255, 136, 0.35);
      transform: translateY(-1px);
    }

    .qh-btn-outline {
      background: transparent;
      color: var(--qh-text-main);
      font-weight: 600;
      font-size: 0.9rem;
      padding: 9px 20px;
      border-radius: var(--qh-radius);
      border: 1px solid var(--qh-border-line);
      transition: var(--qh-transition);
    }

    .qh-btn-outline:hover {
      border-color: var(--qh-text-muted);
      background: rgba(255, 255, 255, 0.04);
      color: #fff;
    }

    /* 板块共有视觉 */
    section {
      padding: 90px 0;
      position: relative;
      border-bottom: 1px solid var(--qh-border-line);
    }

    .qh-section-header {
      margin-bottom: 54px;
    }

    .qh-kicker {
      text-transform: uppercase;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.12em;
      color: var(--qh-brand-neon);
      margin-bottom: 12px;
      display: inline-block;
    }

    .qh-section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: #fff;
      letter-spacing: -0.03em;
      line-height: 1.25;
      margin-bottom: 16px;
    }

    .qh-section-desc {
      font-size: 1rem;
      color: var(--qh-text-muted);
      max-width: 680px;
      line-height: 1.7;
    }

    .qh-card {
      background: var(--qh-bg-surface);
      border: 1px solid var(--qh-border-line);
      border-radius: var(--qh-radius);
      padding: 32px 28px;
      height: 100%;
      transition: var(--qh-transition);
      position: relative;
    }

    .qh-card:hover {
      border-color: var(--qh-border-hover);
      transform: translateY(-3px);
      box-shadow: var(--qh-shadow);
    }

    /* 秒杀与倒计时横幅组件 (Hero 顶部) */
    .qh-flash-banner {
      background: linear-gradient(90deg, #1B2129 0%, #14181D 100%);
      border: 1px solid rgba(0, 255, 136, 0.25);
      border-radius: var(--qh-radius);
      padding: 14px 24px;
      margin-bottom: 32px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .qh-timer-unit {
      background: #090B0D;
      padding: 3px 8px;
      border-radius: 4px;
      font-family: monospace;
      font-weight: 700;
      color: var(--qh-brand-neon);
      font-size: 1rem;
      border: 1px solid rgba(255,255,255,0.08);
    }

    /* 板块细节与自定义结构 */
    .qh-hero {
      background: radial-gradient(circle at 80% 20%, rgba(0, 229, 255, 0.08) 0%, transparent 60%),
                  radial-gradient(circle at 20% 70%, rgba(0, 255, 136, 0.05) 0%, transparent 50%),
                  var(--qh-bg-base);
      padding-top: 50px;
      padding-bottom: 100px;
    }

    .qh-hero-h1 {
      font-size: 3.1rem;
      font-weight: 900;
      line-height: 1.15;
      letter-spacing: -0.04em;
      color: #fff;
      margin-bottom: 24px;
    }

    .qh-hero-h1 span {
      background: linear-gradient(90deg, #fff 0%, var(--qh-brand-neon) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .qh-hero-intro {
      font-size: 1.12rem;
      color: var(--qh-text-muted);
      line-height: 1.75;
      margin-bottom: 36px;
    }

    .qh-hero-visual {
      border: 1px solid var(--qh-border-line);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 24px 60px rgba(0,0,0,0.7);
      position: relative;
    }

    .qh-metric-tag {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(13, 15, 18, 0.88);
      backdrop-filter: blur(12px);
      border: 1px solid var(--qh-border-line);
      border-radius: 6px;
      padding: 12px 18px;
    }

    /* 6宫格卡片修饰 */
    .qh-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: rgba(0, 255, 136, 0.08);
      color: var(--qh-brand-neon);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 20px;
      border: 1px solid rgba(0, 255, 136, 0.15);
    }

    /* 步骤轴 */
    .qh-step-card {
      position: relative;
      background: var(--qh-bg-surface);
      border: 1px solid var(--qh-border-line);
      border-radius: var(--qh-radius);
      padding: 30px;
      height: 100%;
    }

    .qh-step-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(255, 255, 255, 0.1);
      line-height: 1;
      margin-bottom: 14px;
    }

    /* 数字看板 */
    .qh-metrics-row {
      background: var(--qh-bg-surface);
      border: 1px solid var(--qh-border-line);
      border-radius: 12px;
      padding: 40px 20px;
    }

    .qh-metric-val {
      font-size: 2.8rem;
      font-weight: 800;
      color: #fff;
      letter-spacing: -0.04em;
      line-height: 1;
      margin-bottom: 8px;
    }

    .qh-metric-val span {
      color: var(--qh-brand-neon);
      font-size: 1.8rem;
    }

    /* 手风琴改造 */
    .accordion-item {
      background-color: var(--qh-bg-surface);
      border: 1px solid var(--qh-border-line);
      margin-bottom: 12px;
      border-radius: var(--qh-radius) !important;
      overflow: hidden;
    }

    .accordion-button {
      background-color: var(--qh-bg-surface);
      color: #fff;
      font-weight: 600;
      font-size: 1.05rem;
      box-shadow: none !important;
      padding: 22px 24px;
    }

    .accordion-button:not(.collapsed) {
      background-color: var(--qh-bg-elevated);
      color: var(--qh-brand-neon);
    }

    .accordion-button::after {
      filter: invert(1);
    }

    .accordion-body {
      background-color: var(--qh-bg-elevated);
      color: var(--qh-text-muted);
      line-height: 1.7;
      padding: 22px 24px;
      border-top: 1px solid var(--qh-border-line);
    }

    /* 页脚 */
    .qh-footer {
      background: #090B0D;
      padding: 70px 0 30px;
      color: var(--qh-text-muted);
      font-size: 0.9rem;
    }

    .qh-footer-title {
      color: #fff;
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 20px;
      letter-spacing: 0.02em;
    }

    .qh-footer-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .qh-footer-list li {
      margin-bottom: 10px;
    }

    .qh-footer-list a:hover {
      color: var(--qh-brand-neon);
    }

    @media (max-width: 991.98px) {
      .qh-hero-h1 {
        font-size: 2.3rem;
      }
      section {
        padding: 60px 0;
      }
      .qh-section-title {
        font-size: 1.75rem;
      }
    }