:root {
  --bg: #0b1530;
  --bg-panel: #122046;
  --bg-panel-2: #182a5e;
  --accent: #2563eb;        /* Bakai blue */
  --accent-2: #60a5fa;       /* Lighter blue for highlights */
  --bakai-red: #dc2626;      /* Bakai red accent */
  --danger: #ef4444;
  --warn: #f59e0b;
  --text: #e6edf7;
  --muted: #94a3b8;
  --border: #1e3a8a33;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 18px 80px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}

.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: 0.4px;
}

.brand-mark {
  width: 30px; height: 30px;
  background-image: url("/img/logo.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  display: inline-block;
  flex-shrink: 0;
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.25);
}

.card + .card { margin-top: 18px; }

h1, h2, h3 { margin-top: 0; }

label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }

input[type="text"], input[type="email"], input[type="password"],
select, textarea {
  width: 100%;
  background: var(--bg-panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 13px;
  font-size: 15px;
  outline: none;
  transition: border 0.15s ease;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }

.field { margin-bottom: 14px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent);
  color: #ffffff;
  border: none;
  border-radius: 10px;
  padding: 11px 18px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.05s ease, filter 0.15s ease;
}
.btn:hover { filter: brightness(1.08); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-danger { background: var(--danger); color: white; }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab {
  padding: 8px 14px; border-radius: 10px;
  background: var(--bg-panel-2); color: var(--muted); cursor: pointer;
  border: 1px solid var(--border); font-size: 14px;
}
.tab.active { background: var(--accent); color: #ffffff; border-color: transparent; font-weight: 600; }

.alert {
  border-radius: 10px; padding: 12px 14px; margin: 12px 0; font-size: 14px;
  background: rgba(239, 68, 68, 0.12); color: #fca5a5; border: 1px solid rgba(239, 68, 68, 0.4);
}
.alert.ok { background: rgba(16,185,129,0.12); color: #6ee7b7; border-color: rgba(16,185,129,0.4); }

.muted { color: var(--muted); }
.row { display: flex; gap: 10px; align-items: center; }
.row.spread { justify-content: space-between; }
.tag {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 12px; background: var(--bg-panel-2); color: var(--muted);
  border: 1px solid var(--border);
}
.tag.ok { color: #6ee7b7; border-color: rgba(16,185,129,0.4); background: rgba(16,185,129,0.1); }
.tag.fail { color: #fca5a5; border-color: rgba(239,68,68,0.4); background: rgba(239,68,68,0.1); }

/* Exam-specific */
.exam-progress {
  background: var(--bg-panel-2);
  height: 8px; border-radius: 999px; overflow: hidden; margin: 8px 0 16px;
}
.exam-progress > div {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0%; transition: width 0.2s ease;
}

.exam-timer {
  position: fixed; top: 18px; right: 18px;
  background: var(--bg-panel); border: 1px solid var(--border);
  padding: 10px 16px; border-radius: 12px; font-weight: 700;
  font-variant-numeric: tabular-nums;
  z-index: 10;
}
.exam-timer.warn { color: var(--warn); border-color: var(--warn); }
.exam-timer.danger {
  color: white; background: var(--danger); border-color: var(--danger);
  animation: pulse 1s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.exam-hint {
  background: rgba(245, 158, 11, 0.10);
  border: 1px solid rgba(245, 158, 11, 0.45);
  color: #fcd34d;
  border-radius: 10px;
  padding: 10px 14px;
  margin: 4px 0 14px;
  font-size: 14px;
  line-height: 1.45;
}
.exam-hint .lbl { font-weight: 700; margin-right: 6px; }

.option-card {
  display: block; width: 100%; text-align: left;
  background: var(--bg-panel-2); border: 1px solid var(--border);
  padding: 14px 16px; border-radius: 12px; margin-bottom: 10px;
  color: var(--text); cursor: pointer; font-size: 15px;
  transition: border 0.12s ease, background 0.12s ease;
}
.option-card:hover { border-color: var(--accent); }
.option-card.selected {
  background: rgba(16,185,129,0.12);
  border-color: var(--accent);
}
.option-card.correct { background: rgba(16,185,129,0.15); border-color: var(--accent); }
.option-card.wrong   { background: rgba(239,68,68,0.15);  border-color: var(--danger); }
.option-card .marker { font-weight: 700; margin-right: 10px; color: var(--accent-2); }

table {
  width: 100%; border-collapse: collapse; font-size: 14px;
}
th, td {
  text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border);
}
th { color: var(--muted); font-weight: 600; font-size: 13px; }
tbody tr:hover { background: rgba(255,255,255,0.02); }

.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px; margin-bottom: 18px;
}
.stat-card {
  background: var(--bg-panel-2); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px;
}
.stat-card .v { font-size: 26px; font-weight: 700; }
.stat-card .k { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }

.cat-bar {
  display: flex; align-items: center; gap: 10px; margin: 6px 0;
}
.cat-bar .lbl { width: 180px; font-size: 13px; color: var(--muted); }
.cat-bar .track {
  flex: 1; height: 10px; background: var(--bg-panel-2); border-radius: 999px; overflow: hidden;
}
.cat-bar .track > div {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2));
}
.cat-bar .pct { width: 60px; text-align: right; font-variant-numeric: tabular-nums; }

footer.app-footer {
  text-align: center; margin-top: 40px; font-size: 12px; color: var(--muted);
}

@media (max-width: 640px) {
  .exam-timer { top: 10px; right: 10px; padding: 8px 12px; font-size: 14px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .cat-bar .lbl { width: 110px; }
}