/* roulang page: index */
:root {
      --primary-dark: #0F141C;
      --primary-card: #151D28;
      --accent-green: #00E599;
      --accent-hover: #05F196;
      --accent-orange: #FF5E3A;
      --slate-gray: #2D3748;
      --light-gray-bg: #F4F6F9;
      --text-heading: #111827;
      --text-body: #4B5563;
      --text-muted: #9CA3AF;
      --border-color: #E5E7EB;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-pill: 9999px;
      --shadow-sm: 0 2px 8px rgba(15, 20, 28, 0.04);
      --shadow-hover: 0 12px 24px -4px rgba(15, 20, 28, 0.12);
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      color: var(--text-body);
      background-color: #FFFFFF;
      line-height: 1.8;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-heading);
      font-weight: 700;
      letter-spacing: -0.015em;
    }

    p {
      margin-bottom: 1.25rem;
    }

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

    .container {
      max-width: 1240px;
    }

    /* 顶部双行导航 */
    .top-subnav {
      background-color: #0B0E14;
      font-size: 0.85rem;
      color: #9CA3AF;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .top-subnav a {
      color: #9CA3AF;
    }
    .top-subnav a:hover {
      color: #FFFFFF;
    }
    .lang-pill {
      background: rgba(255,255,255,0.08);
      border-radius: var(--radius-pill);
      padding: 2px 10px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .lang-pill .active-lang {
      color: var(--accent-green);
      font-weight: 600;
    }

    .main-nav-wrapper {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(15, 20, 28, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .brand-logo-text {
      color: #FFFFFF;
      font-size: 1.35rem;
      font-weight: 800;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-logo-text .logo-geom {
      width: 26px;
      height: 26px;
      background: var(--accent-green);
      transform: skewX(-15deg);
      display: inline-block;
      box-shadow: 0 0 12px rgba(0,229,153,0.5);
    }
    .nav-link {
      color: #D1D5DB !important;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 18px 12px !important;
      transition: color 0.2s ease;
    }
    .nav-link:hover {
      color: var(--accent-green) !important;
    }
    .btn-cta-green {
      background-color: var(--accent-green);
      color: #0F141C;
      font-weight: 700;
      border-radius: var(--radius-pill);
      padding: 9px 24px;
      border: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-cta-green:hover {
      background-color: var(--accent-hover);
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(0, 229, 153, 0.25);
    }
    .btn-outline-tech {
      border: 1px solid rgba(255,255,255,0.25);
      color: #FFFFFF;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 9px 22px;
      background: transparent;
      transition: all 0.25s ease;
    }
    .btn-outline-tech:hover {
      background: rgba(255,255,255,0.1);
      color: #FFFFFF;
      border-color: #FFFFFF;
    }

    /* 板块排版通用 */
    .section-spacing {
      padding: 90px 0;
    }
    .bg-light-alt {
      background-color: var(--light-gray-bg);
    }
    .bg-dark-pro {
      background-color: var(--primary-dark);
      color: #F3F4F6;
    }
    .bg-dark-pro h2, .bg-dark-pro h3, .bg-dark-pro h4 {
      color: #FFFFFF;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      margin-bottom: 14px;
      background: rgba(0, 229, 153, 0.12);
      color: #059669;
      border: 1px solid rgba(0, 229, 153, 0.3);
    }
    .bg-dark-pro .section-badge {
      color: var(--accent-green);
      background: rgba(0, 229, 153, 0.15);
      border-color: rgba(0, 229, 153, 0.3);
    }

    /* 1. Hero 蓝图设定：新品发布，倒计时环 + 卖点要点 + 预约购买 */
    .hero-section {
      background: linear-gradient(135deg, rgba(15, 20, 28, 0.94), rgba(11, 14, 20, 0.97)), url('/assets/images/6552fd08953116e5.jpg') center/cover no-repeat;
      color: #FFFFFF;
      padding: 100px 0 90px;
      position: relative;
    }
    .countdown-ring-box {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.12);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-md);
      padding: 30px;
      text-align: center;
    }
    .countdown-timer-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin: 24px 0;
    }
    .timer-unit {
      background: #0B0E14;
      border: 1px solid rgba(0, 229, 153, 0.3);
      border-radius: 8px;
      padding: 12px 16px;
      min-width: 72px;
    }
    .timer-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent-green);
      line-height: 1;
      font-variant-numeric: tabular-nums;
    }
    .timer-lbl {
      font-size: 0.75rem;
      color: #9CA3AF;
      margin-top: 4px;
    }

    /* 通用卡片提升 */
    .app-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
      height: 100%;
    }
    .app-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #CBD5E1;
    }

    /* 8. 关键效能数据 */
    .metric-counter {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-green);
      line-height: 1.1;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }

    /* FAQ 手风琴 */
    .accordion-button:not(.collapsed) {
      color: #0F141C;
      background-color: rgba(0, 229, 153, 0.08);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: rgba(0, 229, 153, 0.5);
    }

    /* 移动端浮动吸底条 */
    .mobile-sticky-bottom {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: #0F141C;
      border-top: 1px solid rgba(255,255,255,0.15);
      padding: 10px 16px;
      z-index: 1040;
    }
    @media (max-width: 768px) {
      .mobile-sticky-bottom {
        display: flex;
        gap: 12px;
      }
      body {
        padding-bottom: 64px;
      }
      .metric-counter {
        font-size: 2.2rem;
      }
    }