/* roulang page: index */
:root {
      --primary: #00E075;
      --primary-hover: #00c767;
      --accent: #FF5722;
      --bg-dark: #0F1115;
      --bg-surface: #181B22;
      --bg-elevated: #21252E;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-light: rgba(255, 255, 255, 0.15);
      --text-white: #FFFFFF;
      --text-muted: #A0A6B5;
      --text-dark: #525866;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      background-color: var(--bg-dark);
      color: var(--text-white);
      font-family: var(--font-stack);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1); }
    img { max-width: 100%; height: auto; display: block; }
    
    /* 顶部双行导航 */
    .top-sub-bar {
      background: #08090C;
      font-size: 0.8rem;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border-subtle);
      padding: 6px 0;
    }
    .top-main-nav {
      background: rgba(15, 17, 21, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
      position: sticky;
      top: 0;
      z-index: 1030;
      padding: 14px 0;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 800;
      color: #fff;
      letter-spacing: -0.02em;
    }
    .brand-logo-wrap .logo-badge {
      background: var(--primary);
      color: #000;
      padding: 4px 8px;
      border-radius: 6px;
      font-size: 0.9rem;
      font-weight: 900;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .nav-link-custom {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 6px 14px;
      border-radius: 6px;
    }
    .nav-link-custom:hover {
      color: var(--primary);
      background: rgba(255, 255, 255, 0.03);
    }
    .btn-action-glow {
      background: var(--primary);
      color: #000;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 30px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 18px rgba(0, 224, 117, 0.25);
      border: none;
    }
    .btn-action-glow:hover {
      background: var(--primary-hover);
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 224, 117, 0.35);
    }
    
    /* 通用组件 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }
    .section-bg-alt {
      background-color: #13161C;
    }
    .section-title-wrap {
      margin-bottom: 45px;
    }
    .badge-label {
      background: rgba(0, 224, 117, 0.12);
      color: var(--primary);
      border: 1px solid rgba(0, 224, 117, 0.3);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.78rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .section-head-title {
      font-size: clamp(1.8rem, 3vw, 2.5rem);
      font-weight: 800;
      line-height: 1.25;
      color: #fff;
    }
    .section-head-desc {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 680px;
      margin-top: 10px;
    }
    .card-ui {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: 14px;
      transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s, box-shadow 0.25s;
      overflow: hidden;
    }
    .card-ui:hover {
      border-color: rgba(0, 224, 117, 0.35);
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    }

    /* 板块一：Hero 优惠券墙/权益入口大横幅 */
    .hero-banner-section {
      padding: 60px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(0, 224, 117, 0.12) 0%, transparent 60%),
                  linear-gradient(180deg, #0F1115 0%, #151820 100%);
      border-bottom: 1px solid var(--border-subtle);
    }
    .hero-h1 {
      font-size: clamp(2.3rem, 4.5vw, 3.6rem);
      font-weight: 900;
      line-height: 1.15;
      letter-spacing: -0.03em;
      margin-bottom: 20px;
    }
    .hero-intro {
      font-size: 1.12rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      max-width: 640px;
    }
    .coupon-card-main {
      background: linear-gradient(135deg, #1C222C 0%, #161A22 100%);
      border: 2px dashed rgba(0, 224, 117, 0.5);
      border-radius: 16px;
      padding: 30px;
      position: relative;
      box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
    }
    .coupon-badge-top {
      position: absolute;
      top: -14px;
      right: 25px;
      background: var(--accent);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 4px 14px;
      border-radius: 12px;
      box-shadow: 0 4px 12px rgba(255, 87, 34, 0.4);
    }
    .coupon-value {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      font-family: monospace;
    }

    /* 板块二：数据看板 */
    .metric-box {
      padding: 24px 20px;
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      text-align: center;
    }
    .metric-value {
      font-size: 2.5rem;
      font-weight: 800;
      color: #fff;
      font-family: monospace;
      letter-spacing: -0.03em;
    }
    .metric-value span { color: var(--primary); font-size: 1.4rem; }

    /* 板块三：Bento Grid 核心矩阵 */
    .bento-grid {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 20px;
    }
    .bento-col-4 { grid-column: span 4; }
    .bento-col-6 { grid-column: span 6; }
    .bento-col-8 { grid-column: span 8; }
    .bento-col-12 { grid-column: span 12; }
    @media (max-width: 991px) {
      .bento-col-4, .bento-col-6, .bento-col-8 { grid-column: span 12; }
    }

    /* 板块十：动态卡片 */
    .news-card-thumb {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }

    /* 手风琴样式重置 */
    .accordion-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      margin-bottom: 12px;
      border-radius: 10px !important;
      overflow: hidden;
    }
    .accordion-button {
      background: var(--bg-surface);
      color: #fff;
      font-weight: 600;
      box-shadow: none !important;
      padding: 20px;
    }
    .accordion-button:not(.collapsed) {
      background: var(--bg-elevated);
      color: var(--primary);
    }
    .accordion-button::after {
      filter: invert(1);
    }
    .accordion-body {
      background: var(--bg-surface);
      color: var(--text-muted);
      border-top: 1px solid var(--border-subtle);
      padding: 20px;
    }

    /* 邀请裂变条 */
    .progress-bar-custom {
      height: 10px;
      background: rgba(255, 255, 255, 0.08);
      border-radius: 5px;
      overflow: hidden;
    }
    .progress-fill {
      height: 100%;
      background: var(--primary);
      width: 65%;
      border-radius: 5px;
    }

    /* 页脚 */
    .site-footer {
      background: #0B0D11;
      border-top: 1px solid var(--border-subtle);
      padding: 60px 0 30px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .footer-heading {
      color: #fff;
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 18px;
    }
    .footer-list {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-list li { margin-bottom: 10px; }
    .footer-list a:hover { color: var(--primary); }
    .footer-bottom {
      border-top: 1px solid var(--border-subtle);
      margin-top: 40px;
      padding-top: 25px;
      font-size: 0.8rem;
      color: var(--text-dark);
    }