:root {
  --gold: #F5B301;
  --navy: #0B1B3A;
  --navy-2: #13294d;
  --bg: #0b0f1a;
  --card: #131a2b;
  --text: #e8eaf0;
  --muted: #8a93a8;
  --green: #2ecc71;
  --red: #e74c3c;
  --amber: #f39c12;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
.brand-bar {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 22px;
  background: linear-gradient(135deg, var(--navy), var(--navy-2));
  border-bottom: 2px solid var(--gold);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-size: 20px; font-weight: 800; color: var(--gold); letter-spacing: 0.5px; }
.tagline { flex: 1; color: var(--muted); font-size: 13px; }
.lang-select {
  background: var(--navy-2); color: var(--text); border: 1px solid #2a3a60;
  border-radius: 8px; padding: 6px 10px; font-size: 13px;
}
#view { max-width: 760px; margin: 0 auto; padding: 24px 16px 60px; }

/* Auth */
.auth-card {
  background: var(--card); border: 1px solid #23304f; border-radius: 14px;
  padding: 32px; margin-top: 40px; max-width: 420px; margin-left: auto; margin-right: auto;
}
.auth-card h2 { color: var(--gold); margin-bottom: 6px; }
.auth-card p.sub { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.auth-tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.auth-tabs button {
  flex: 1; padding: 8px; background: var(--navy-2); color: var(--muted);
  border: 1px solid #2a3a60; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.auth-tabs button.active { background: var(--gold); color: var(--navy); font-weight: 700; border-color: var(--gold); }
.consent-row { display: flex; gap: 8px; align-items: flex-start; font-size: 13px; color: var(--muted); margin: 8px 0; }
.consent-row input { margin-top: 3px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12.5px; color: var(--muted); margin-bottom: 5px; }
.field input {
  width: 100%; padding: 11px 12px; background: var(--navy-2); color: var(--text);
  border: 1px solid #2a3a60; border-radius: 8px; font-size: 15px;
}
.btn {
  width: 100%; padding: 12px; border: none; border-radius: 8px; cursor: pointer;
  font-size: 15px; font-weight: 700; background: var(--gold); color: var(--navy);
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-ghost { background: var(--navy-2); color: var(--text); border: 1px solid #2a3a60; }
.btn-google {
  background: #fff; color: #333; display: flex; align-items: center; justify-content: center;
  gap: 8px; margin-bottom: 14px;
}
.btn-google:disabled { opacity: 0.5; }
.err { color: var(--red); font-size: 13px; margin-top: 10px; min-height: 18px; }

.plan-grid, .mode-grid, .summary-grid { display:flex; flex-wrap:wrap; gap:8px; margin-top:8px; }
.mode-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(140px,1fr)); gap:10px; }
.mode-card { text-align:left; cursor:pointer; display:flex; flex-direction:column; gap:6px; }
.mode-card span { color:var(--muted); font-size:12px; }
.drill-list { display:flex; flex-direction:column; gap:8px; }
.drill-item { display:flex; justify-content:space-between; align-items:center; cursor:pointer; text-align:left; width:100%; }
.mistake-row { padding:10px 0; border-bottom:1px dashed #23304f; }
.summary-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin:16px 0; text-align:center; }
.summary-grid b { display:block; font-size:22px; color:var(--gold); }
.summary-grid span { font-size:12px; color:var(--muted); }

.practice-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.stat-chip {
  background: var(--card); border: 1px solid #23304f; border-radius: 10px;
  padding: 8px 14px; font-size: 13px;
}
.stat-chip b { color: var(--gold); }
.ring-wrap { display: flex; align-items: center; gap: 12px; }
.ring { width: 46px; height: 46px; border-radius: 50%; position: relative;
  background: conic-gradient(var(--gold) 0deg, #23304f 0deg); }
.ring::after { content: attr(data-label); position: absolute; inset: 5px; border-radius: 50%;
  background: var(--card); display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: var(--gold); }
.ring.locked { background: #23304f; filter: grayscale(0.6); }
.ring.locked::after { color: var(--muted); }
.badge-chip { border-color: var(--gold); color: var(--gold); font-weight: 700; }
.reveal-hint { color: var(--muted); font-style: italic; border-style: dashed; }

.q-card {
  background: var(--card); border: 1px solid #23304f; border-radius: 14px;
  padding: 26px; margin-bottom: 14px;
}
.q-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.q-chip { background: var(--navy-2); color: var(--muted); font-size: 11.5px;
  padding: 4px 10px; border-radius: 20px; border: 1px solid #2a3a60; }
.q-text { font-size: 17.5px; line-height: 1.5; margin-bottom: 20px; }
.opt {
  display: flex; align-items: center; gap: 12px; padding: 13px 16px;
  background: var(--navy-2); border: 1px solid #2a3a60; border-radius: 10px;
  margin-bottom: 10px; cursor: pointer; font-size: 15px; transition: all .15s;
}
.opt:hover { border-color: var(--gold); }
.opt .key { font-weight: 800; color: var(--gold); min-width: 20px; }
.opt.correct { border-color: var(--green); background: rgba(46,204,113,.12); }
.opt.wrong { border-color: var(--red); background: rgba(231,76,60,.12); }
.opt.disabled { pointer-events: none; }

.feedback { border-radius: 10px; padding: 16px; margin-top: 14px; font-size: 14px; line-height: 1.5; }
.feedback.good { background: rgba(46,204,113,.1); border: 1px solid var(--green); }
.feedback.bad { background: rgba(231,76,60,.1); border: 1px solid var(--red); }
.feedback .rationale { margin-top: 10px; color: var(--muted); font-size: 13px; }
.feedback .delta { float: right; font-weight: 700; }

.action-row { display: flex; gap: 10px; margin-top: 16px; }
.action-row .btn { flex: 1; }
.exam-timer { font-size: 22px; font-weight: 800; color: var(--gold); text-align: center; margin-bottom: 14px; }
.exam-timer.danger { color: var(--red); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .4; } }

/* Progress tree */
.p-tree { margin-top: 10px; }
.p-node { display: flex; align-items: center; gap: 8px; padding: 7px 10px; border-radius: 8px; cursor: pointer; font-size: 13.5px; }
.p-node:hover { background: var(--navy-2); }
.p-node .bar { flex: 1; height: 6px; background: #23304f; border-radius: 3px; overflow: hidden; }
.p-node .bar i { display: block; height: 100%; }
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot.green { background: var(--green); } .dot.amber { background: var(--amber); } .dot.red { background: var(--red); } .dot.gray { background: #3a4560; }

/* Leaderboard */
.lb-row { display: flex; align-items: center; gap: 12px; padding: 11px 14px;
  background: var(--card); border: 1px solid #23304f; border-radius: 10px; margin-bottom: 8px; }
.lb-row.me { border-color: var(--gold); }
.lb-rank { font-weight: 800; color: var(--gold); width: 30px; }
.lb-name { flex: 1; }

/* Admin */
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th, .admin-table td { padding: 8px 10px; border-bottom: 1px solid #23304f; text-align: left; }
.empty { color: var(--muted); text-align: center; padding: 40px; font-size: 14px; }
.nav-row { display: flex; gap: 8px; margin-bottom: 20px; }
.nav-row .btn { flex: 0 0 auto; width: auto; padding: 8px 16px; font-size: 13px; }
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--navy-2); border: 1px solid var(--gold); color: var(--gold);
  padding: 12px 22px; border-radius: 30px; font-size: 14px; z-index: 100;
  animation: fadein .3s; }
@keyframes fadein { from { opacity: 0; transform: translateX(-50%) translateY(10px); } }