:root {
  --acc: #2563eb;
  --muted: #64748b;
  --good: #10b981;
  --warn: #f59e0b;
  --bad: #ef4444;
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

.hidden { display: none !important; }

/* ---------- Login screen ---------- */
#login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.login-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
}

.login-box h1 { font-size: 1.25rem; margin: 0 0 4px; }
.login-box p.sub { color: var(--muted); font-size: 0.9rem; margin: 0 0 20px; }

.login-box label { display: block; font-size: 0.85rem; font-weight: 600; margin: 14px 0 4px; }
.login-box input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 1rem;
}

.login-box button {
  margin-top: 20px; width: 100%; padding: 12px; border: none;
  border-radius: 8px; background: var(--acc); color: white;
  font-size: 1rem; font-weight: 600; cursor: pointer;
}
.login-box button:disabled { opacity: 0.6; cursor: default; }

#login-error {
  margin-top: 12px; padding: 10px 12px; border-radius: 8px;
  background: #fef2f2; color: #b91c1c; font-size: 0.85rem; display: none;
}

.warn-box {
  margin-top: 18px; padding: 10px 12px; border-radius: 8px;
  background: #fffbeb; color: #92400e; font-size: 0.8rem;
}

/* ---------- App header ---------- */
#app-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--card); border-bottom: 1px solid var(--border);
  padding: 10px 20px; display: flex; align-items: center;
  gap: 16px; flex-wrap: wrap;
}

.who { font-size: 0.85rem; }
.who b { display: block; font-size: 0.95rem; }
.spacer { flex: 1; }

.badge {
  font-size: 0.78rem; padding: 4px 10px; border-radius: 999px;
  background: #f1f5f9; color: var(--muted); white-space: nowrap;
}
.badge.alert { background: #fef2f2; color: var(--bad); }
.badge.ok { background: #ecfdf5; color: #047857; }

#submit-btn {
  padding: 10px 18px; border: none; border-radius: 8px;
  background: var(--good); color: white; font-weight: 600; cursor: pointer;
  font-size: 0.9rem;
}
#submit-btn:disabled { background: #94a3b8; cursor: default; }

/* ---------- Main content ---------- */
#exam-wrap { max-width: 880px; margin: 0 auto; padding: 20px 16px 80px; }

.q-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px; margin-bottom: 18px;
  break-inside: avoid; page-break-inside: avoid;
}

.q-card h2 {
  font-size: 1rem; margin: 0 0 4px;
  display: flex; align-items: baseline; gap: 8px;
}
.q-card h2 .pts { font-size: 0.78rem; color: var(--muted); font-weight: 400; }
.q-card .intro { color: var(--muted); font-size: 0.88rem; margin-bottom: 12px; }

.q-part { margin-top: 16px; }
.q-part:first-of-type { margin-top: 10px; }
.q-part > label.part-label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; }

textarea, select, input[type=text], input[type=number] {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 0.92rem; font-family: inherit;
  background: white; color: var(--text);
}
textarea { resize: vertical; min-height: 70px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
@media (max-width: 560px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

.blank-row { display: flex; align-items: center; gap: 8px; margin: 6px 0; font-size: 0.9rem; }
.blank-row .n { color: var(--muted); min-width: 18px; }
.blank-row select { flex: 1; }
.blank-row select.dup { border-color: var(--bad); background: #fef2f2; }

.wordbank {
  display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px;
}
.wordbank span {
  background: #eff6ff; color: var(--acc); border-radius: 999px;
  padding: 4px 10px; font-size: 0.78rem; font-weight: 600;
}

table.mini { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin: 8px 0; }
table.mini th, table.mini td { border: 1px solid var(--border); padding: 6px 8px; text-align: center; }
table.mini th { background: #f8fafc; }
table.mini input { text-align: center; padding: 6px; }

.matrix-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.matrix-table th, .matrix-table td { border: 1px solid var(--border); padding: 6px 8px; }
.matrix-table th { background: #f8fafc; font-weight: 600; text-align: left; }
.matrix-table td { text-align: center; }
.matrix-table select { min-width: 140px; }

.note-box {
  background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 8px;
  padding: 10px 14px; font-size: 0.85rem; color: #1e3a8a; margin: 10px 0;
  white-space: pre-line;
}

.canvas-tool { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.canvas-tool canvas { display: block; width: 100%; touch-action: none; background: white; cursor: crosshair; }
.canvas-toolbar { display: flex; gap: 8px; padding: 6px 8px; background: #f8fafc; border-top: 1px solid var(--border); }
.canvas-toolbar button {
  padding: 6px 10px; border: 1px solid var(--border); background: white;
  border-radius: 6px; font-size: 0.78rem; cursor: pointer;
}
.canvas-toolbar button.active { background: var(--acc); color: white; border-color: var(--acc); }

.save-dot {
  width: 8px; height: 8px; border-radius: 50%; display: inline-block;
  margin-right: 5px; background: var(--good);
}
.save-dot.pending { background: var(--warn); }

#submitted-banner {
  max-width: 880px; margin: 20px auto; padding: 16px 20px;
  background: #ecfdf5; border: 1px solid #a7f3d0; border-radius: 12px;
  color: #047857; font-weight: 600; text-align: center;
}

footer.note {
  max-width: 880px; margin: 0 auto 40px; padding: 0 16px;
  color: var(--muted); font-size: 0.78rem; text-align: center;
}

/* ---------- Word cloud (Q1) ---------- */
.wordcloud {
  position: relative; height: 130px; margin-bottom: 14px;
  background: #f8fafc; border: 1px solid var(--border); border-radius: 10px;
  overflow: hidden;
}
.wordcloud span {
  position: absolute; font-weight: 700; white-space: nowrap;
  user-select: none;
}

/* ---------- Timer badge ---------- */
#timer-badge { font-variant-numeric: tabular-nums; font-weight: 700; }
#timer-badge.warn { background: #fffbeb; color: #b45309; }
#timer-badge.danger { background: #fef2f2; color: var(--bad); }

/* ---------- Lockout overlay ---------- */
#lockout-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(15, 23, 42, 0.75);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.lockout-box {
  background: white; border-radius: 14px; padding: 28px; max-width: 420px;
  text-align: center; box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}
.lockout-box h2 { margin: 0 0 10px; color: var(--bad); font-size: 1.15rem; }
.lockout-box p { margin: 0; color: var(--text); font-size: 0.92rem; }
.lockout-box.warn h2 { color: var(--warn); }
.lockout-box button {
  margin-top: 16px; padding: 10px 18px; border: none; border-radius: 8px;
  background: var(--acc); color: white; font-weight: 600; cursor: pointer; font-size: 0.9rem;
}