:root {
      --bg: #f5f7fb;
      --bg-card: #ffffff;
      --bg-chip: #eef2ff;
      --border-subtle: #dde3f0;
      --accent: #2563eb;
      --accent-soft: rgba(37, 99, 235, 0.1);
      --accent-strong: #1d4ed8;
      --text-main: #111827;
      --text-muted: #6b7280;
      --text-soft: #607D8B;
      --danger: #dc2626;
      --success: #16a34a;
      --warning: #d97706;
      --shadow-card: 0 8px 24px rgba(15, 23, 42, 0.08);
      --radius-xl: 16px;
      --radius-pill: 999px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: "Lato", system-ui, -apple-system, BlinkMacSystemFont,
        "Segoe UI", sans-serif;
      background: radial-gradient(circle at top left, #e0edff, #f5f7fb 40%);
      color: var(--text-main);
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    /* Top navbar (similar style to breakouts.html / report.html) */
    .nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid #e5e7eb;
    }

    .nav-inner {
      max-width: 99%;
      margin: 0 auto;
      padding: 0.75rem 1.25rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .nav-left {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .nav-logo {
      width: 32px;
      height: 32px;
      border-radius: 12px;
      background: radial-gradient(circle at 20% 20%, #4f46e5, #1d4ed8);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #f9fafb;
      font-size: 0.9rem;
      font-weight: 700;
    }

    .nav-title {
      font-weight: 700;
      font-size: 1rem;
      letter-spacing: 0.03em;
      color: #111827;
    }

    .nav-sub {
      font-size: 0.75rem;
      color: var(--text-soft);
    }

    .nav-right {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .nav-link {
      padding: 0.45rem 0.85rem;
      border-radius: 999px;
      color: var(--text-muted);
      border: 1px solid transparent;
      font-size: .80rem;
    }

    .nav-link:hover {
      background: #eef2ff;
      color: var(--accent-strong);
    }

    .nav-link.active {
      border-color: var(--accent);
      background: var(--accent-soft);
      color: var(--accent-strong);
      font-weight: 600;
    }

    /* Layout */
    .page {
      max-width: 99%;
      margin: 1.5rem auto 2.5rem;
      padding: 0 1.25rem;
    }
    .has-sub .sub-menu {
      display: none;
      position: absolute;
      top:50px;
      background: white;
      border: 1px solid #ddd;
      border-radius: 6px;
      min-width: 180px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.12);
      padding: 8px 0;
      z-index: 99;
    }
    
    .has-sub:hover .sub-menu {
      display: block;
    }
    
    .sub-link {
      display: block;
      padding: 8px 14px;
      text-decoration: none;
      color: #333;
      white-space: nowrap;
    }
    
    .sub-link:hover {
      background: #eef2ff;
      color: #2563eb;
    }