:root {
      --bg: #0b1020;
      --panel: rgba(16, 24, 48, 0.92);
      --panel-2: rgba(23, 35, 69, 0.92);
      --line: rgba(255,255,255,0.08);
      --text: #eef3ff;
      --muted: #b8c4ea;
      --gold: #ffbf1f;
      --blue: #2d65da;
      --green: #1ea54b;
      --red: #d93547;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: Arial, sans-serif;
      background: radial-gradient(circle at top, #1c3472 0%, #0f1834 45%, #070b18 100%);
      color: var(--text);
      min-height: 100vh;
    }
    a { color: inherit; text-decoration: none; }
    .container { max-width: 1380px; margin: 0 auto; padding: 20px; }
    .topnav {
      display: none; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap;
      margin-bottom: 18px; padding: 14px 16px; border-radius: 20px; background: var(--panel); border: 1px solid var(--line);
      box-shadow: 0 18px 50px rgba(0,0,0,0.35);
    }
    .brand { font-size: 24px; font-weight: 800; letter-spacing: .2px; }
    .nav-links, .nav-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
    .nav-link, button, input, select, textarea {
      font-family: inherit;
    }
    .nav-link, button {
      border: 0; border-radius: 14px; padding: 11px 14px; font-size: 15px; font-weight: 700; cursor: pointer;
      transition: transform .15s ease, opacity .15s ease;
    }
    .nav-link:hover, button:hover { transform: translateY(-1px); }
    .nav-link { background: #132344; color: var(--text); }
    .nav-link.active { background: var(--gold); color: #101010; }
    .btn-gold { background: var(--gold); color: #111; }
    .btn-blue { background: var(--blue); color: #fff; }
    .btn-dark { background: #10192f; color: #fff; border: 1px solid var(--line); }
    .btn-green { background: var(--green); color: #fff; }
    .btn-red { background: var(--red); color: #fff; }
    .btn-small { padding: 8px 10px; font-size: 13px; border-radius: 10px; }
    .hidden { display: none !important; }
    .page { display: none; }
    .page.active { display: block; }
    .hero, .panel {
      background: var(--panel); border: 1px solid var(--line); border-radius: 24px; box-shadow: 0 20px 60px rgba(0,0,0,.34);
    }
    .hero { padding: 28px; }
    .hero h1 { margin: 0 0 8px; font-size: 42px; }
    .subtitle { color: var(--muted); font-size: 17px; line-height: 1.55; }
    .grid-2 { display: grid; grid-template-columns: 1.25fr .95fr; gap: 18px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
    .panel { padding: 20px; }
    .panel h2, .panel h3 { margin-top: 0; }
    .muted { color: var(--muted); line-height: 1.55; }
    .badge { display: inline-flex; align-items: center; gap: 8px; background: #132344; border: 1px solid var(--line); padding: 8px 12px; border-radius: 999px; font-size: 13px; font-weight: 700; }
    .stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
    .stat { background: var(--panel-2); border: 1px solid var(--line); border-radius: 16px; padding: 16px; }
    .stat .value { font-size: 28px; font-weight: 800; margin-bottom: 4px; }
    input, select, textarea {
      width: 100%; background: #0e1833; color: #fff; border: 1px solid rgba(255,255,255,.12); border-radius: 14px;
      padding: 12px 14px; font-size: 15px;
    }
    textarea { min-height: 120px; resize: vertical; }
    .form-grid { display: grid; gap: 12px; }
    .auth-wrap { max-width: 960px; margin: 0 auto; }
    .tabs { display: flex; gap: 10px; margin-bottom: 14px; }
    .table-wrap { overflow: auto; }
    table { width: 100%; border-collapse: collapse; }
    th, td { text-align: left; padding: 12px 10px; border-bottom: 1px solid rgba(255,255,255,.08); vertical-align: top; }
    th { color: #ffcf4a; font-size: 14px; }
    .pill { display: inline-block; padding: 5px 10px; border-radius: 999px; font-size: 12px; font-weight: 700; }
    .pill.student { background: rgba(45,101,218,.2); }
    .pill.teacher { background: rgba(255,191,31,.18); color: #ffe79f; }
    .pill.admin { background: rgba(217,53,71,.2); }
    .pill.active { background: rgba(30,165,75,.2); color: #baf5cb; }
    .pill.blocked { background: rgba(217,53,71,.2); color: #ffb0b9; }
    .hub-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 18px; }
    .game-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
    .game-card { background: var(--panel-2); border: 1px solid var(--line); border-radius: 18px; padding: 16px; }
    .kpi-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
    .message { padding: 12px 14px; border-radius: 12px; margin-bottom: 12px; line-height: 1.5; display: none; }
    .message.ok { display: block; background: rgba(30,165,75,.16); border: 1px solid rgba(30,165,75,.4); }
    .message.warn { display: block; background: rgba(255,191,31,.14); border: 1px solid rgba(255,191,31,.35); color: #fff2bf; }
    .message.err { display: block; background: rgba(217,53,71,.16); border: 1px solid rgba(217,53,71,.4); }
    .game-shell { display: grid; gap: 18px; }
    .game-top { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
    .question-box { background: linear-gradient(180deg, #1f3570 0%, #172852 100%); border-radius: 18px; padding: 24px; font-size: 26px; min-height: 120px; display: flex; align-items: center; }
    .answers { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .answer-btn { background: linear-gradient(180deg, #284f9e 0%, #1d3b78 100%); color: white; min-height: 72px; text-align: left; }
    .answer-btn.correct { background: var(--green) !important; }
    .answer-btn.wrong { background: var(--red) !important; }
    .answer-btn.disabled { opacity: .7; pointer-events: none; }
    .ladder { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
    .ladder li { display: flex; justify-content: space-between; gap: 10px; padding: 10px 12px; background: #132342; border: 1px solid var(--line); border-radius: 12px; }
    .ladder li.current { background: linear-gradient(90deg, #ffbf1f 0%, #f6d46e 100%); color: #111; }
    .mini-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; }
    .mini-card { background: #132344; border: 1px solid var(--line); border-radius: 14px; padding: 12px; }
    .footer-note { margin-top: 18px; color: var(--muted); font-size: 13px; line-height: 1.5; }
    .danger-zone { border: 1px solid rgba(217,53,71,.45); background: rgba(217,53,71,.08); border-radius: 18px; padding: 16px; }
    .settings-grid { display:grid; gap:12px; }
    .chart-wrap { display:grid; gap:12px; margin-bottom:14px; }
    .chart-summary { display:grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap:10px; }
    .chart-box { background: var(--panel-2); border: 1px solid var(--line); border-radius: 14px; padding: 12px; }
    .chart-box strong { display:block; font-size: 22px; margin-bottom: 4px; }
    .bar-chart { display:grid; gap:10px; }
    .bar-row { display:grid; grid-template-columns: minmax(120px, 180px) 1fr 56px; gap:10px; align-items:center; }
    .bar-label { font-size: 14px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
    .bar-track { height: 14px; background: #0e1833; border: 1px solid rgba(255,255,255,.08); border-radius: 999px; overflow:hidden; }
    .bar-fill { height:100%; background: linear-gradient(90deg, #2d65da 0%, #ffbf1f 100%); }
    .bar-value { text-align:right; font-size: 13px; color: var(--muted); }
    @media (max-width: 1024px) {
      .grid-2, .hub-layout { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: 1fr; }
    }
    @media (max-width: 760px) {
      .container { padding: 12px; }
      .hero h1 { font-size: 32px; }
      .answers { grid-template-columns: 1fr; }
    }
  


body.authenticated-shell .topnav {
  display: flex;
}

.kpi-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.kpi-card {
  border-radius: 16px;
  padding: 16px;
  border: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.03);
}