/* roulang page: index */
:root {
      --bg-canvas: #0B0E14;
      --bg-surface: #141824;
      --bg-card: #1B2032;
      --color-primary: #00FF88;
      --color-secondary: #00D2FF;
      --color-accent: #7928CA;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 255, 136, 0.4);
      --font-stack: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    body {
      background-color: var(--bg-canvas);
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.75;
      overflow-x: hidden;
      letter-spacing: -0.01em;
    }

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

    /* 顶部通知条 */
    .top-bar {
      height: 38px;
      background: #070A0F;
      font-size: 13px;
      border-bottom: 1px solid var(--border-subtle);
    }
    .top-bar a:hover {
      color: var(--color-primary);
    }

    /* 主导航 */
    .navbar-cyber {
      background: rgba(11, 14, 20, 0.88);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid var(--border-subtle);
      transition: all 0.3s ease;
    }
    .navbar-brand {
      font-weight: 800;
      font-size: 1.35rem;
      color: var(--text-main);
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .brand-glow {
      color: var(--color-primary);
      text-shadow: 0 0 16px rgba(0, 255, 136, 0.45);
    }
    .nav-link {
      color: var(--text-muted) !important;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 0.5rem 1rem !important;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--color-primary) !important;
    }

    /* 核心按钮风格 */
    .btn-cyber-primary {
      background: var(--color-primary);
      color: #05080E;
      font-weight: 700;
      border: 1px solid var(--color-primary);
      border-radius: 6px;
      padding: 0.65rem 1.6rem;
      box-shadow: 0 0 20px rgba(0, 255, 136, 0.25);
      transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    }
    .btn-cyber-primary:hover {
      background: #00e077;
      color: #000;
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
    }
    .btn-cyber-outline {
      background: rgba(255, 255, 255, 0.03);
      color: var(--text-main);
      font-weight: 600;
      border: 1px solid var(--border-subtle);
      border-radius: 6px;
      padding: 0.65rem 1.6rem;
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }
    .btn-cyber-outline:hover {
      border-color: var(--color-secondary);
      color: var(--color-secondary);
      background: rgba(0, 210, 255, 0.05);
    }

    /* 区域统一间距与标题排版 */
    .section-wrap {
      padding: 90px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 50px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.78rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: 50px;
      background: rgba(0, 255, 136, 0.1);
      border: 1px solid rgba(0, 255, 136, 0.25);
      color: var(--color-primary);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 16px;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 760px;
      line-height: 1.8;
    }

    /* 卡片体系 */
    .cyber-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      padding: 30px;
      transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
      height: 100%;
      position: relative;
      overflow: hidden;
    }
    .cyber-card:hover {
      border-color: var(--color-primary);
      transform: translateY(-4px);
      box-shadow: 0 12px 35px rgba(0, 255, 136, 0.12);
    }
    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: 10px;
      background: rgba(0, 255, 136, 0.08);
      border: 1px solid rgba(0, 255, 136, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      color: var(--color-primary);
      margin-bottom: 22px;
    }

    /* 首屏 Hero */
    #hero {
      position: relative;
      padding: 130px 0 100px;
      background-size: cover;
      background-position: center;
      border-bottom: 1px solid var(--border-subtle);
    }
    #hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(11,14,20,0.85) 0%, rgba(11,14,20,0.96) 100%);
      z-index: 1;
    }
    #hero .container {
      position: relative;
      z-index: 2;
    }
    .hero-h1 {
      font-size: 3.1rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      background: linear-gradient(135deg, #FFFFFF 30%, #A5F3FC 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 步骤卡片指引 */
    .workflow-step {
      position: relative;
      padding: 28px;
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      height: 100%;
    }
    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--color-primary);
      color: #05080E;
      font-weight: 800;
      border-radius: 8px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
    }

    /* 数据指标条 */
    .metric-box {
      border-right: 1px solid var(--border-subtle);
      padding: 24px 20px;
      text-align: center;
    }
    .metric-box:last-child {
      border-right: none;
    }
    .metric-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--color-primary);
      font-family: monospace;
      letter-spacing: -0.04em;
    }

    /* 常见问题手风琴 */
    .accordion-item {
      background: var(--bg-card) !important;
      border: 1px solid var(--border-subtle) !important;
      border-radius: 10px !important;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .accordion-button {
      background: var(--bg-card) !important;
      color: var(--text-main) !important;
      font-weight: 700;
      padding: 20px 24px;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      color: var(--color-primary) !important;
      border-bottom: 1px solid var(--border-subtle);
    }
    .accordion-button::after {
      filter: invert(1);
    }
    .accordion-body {
      color: var(--text-muted);
      padding: 20px 24px;
      line-height: 1.8;
      font-size: 0.96rem;
    }

    /* 底部收口与页脚 */
    #cta {
      background: radial-gradient(circle at center, #1B2032 0%, #0B0E14 100%);
      border-top: 1px solid var(--border-subtle);
      border-bottom: 1px solid var(--border-subtle);
    }
    .footer-top {
      padding: 80px 0 40px;
      border-bottom: 1px solid var(--border-subtle);
    }
    .footer-bottom {
      padding: 25px 0;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 响应式调整 */
    @media (max-width: 991px) {
      .hero-h1 { font-size: 2.3rem; }
      .section-title { font-size: 1.85rem; }
      .metric-box { border-right: none; border-bottom: 1px solid var(--border-subtle); }
      .metric-box:last-child { border-bottom: none; }
    }