:root {
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --bg: #f8fafc;
  --card: #ffffff;
  --good: #16a34a;
  --bad: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

header.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 16px 24px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
header.topbar h1 { font-size: 18px; margin: 0; }
header.topbar span { color: var(--muted); font-size: 13px; }

main { max-width: 880px; margin: 0 auto; padding: 24px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}

h2 { font-size: 16px; margin: 0 0 12px; }
label { display: block; font-size: 13px; font-weight: 600; margin: 12px 0 4px; }
input[type="text"], textarea, select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
}
textarea { min-height: 70px; resize: vertical; }

button {
  cursor: pointer;
  border: none;
  border-radius: 6px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
}
button.primary { background: var(--accent); color: white; }
button.primary:hover { background: var(--accent-dark); }
button.secondary { background: #eef2ff; color: var(--accent-dark); }
button.danger { background: #fee2e2; color: var(--bad); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.question-block {
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 14px;
  position: relative;
}
.question-block .qnum { font-size: 12px; color: var(--muted); font-weight: 700; text-transform: uppercase; }

.tools-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 4px; }
.tools-row label { display: flex; align-items: center; gap: 6px; font-weight: 400; margin: 0; }

.set-list-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.set-list-item img { width: 90px; height: 60px; object-fit: cover; border-radius: 6px; }
.set-list-item .meta { flex: 1; }
.set-list-item .meta h3 { margin: 0 0 4px; font-size: 14px; }
.set-list-item .meta p { margin: 0; color: var(--muted); font-size: 12px; }

.badge {
  display: inline-block;
  background: #eef2ff;
  color: var(--accent-dark);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
  margin-right: 6px;
}

.status-msg { font-size: 13px; margin-top: 10px; }
.status-msg.ok { color: var(--good); }
.status-msg.err { color: var(--bad); }

/* --- student practice page --- */
.stimulus-photo { width: 100%; max-height: 380px; object-fit: contain; border-radius: 10px; border: 1px solid var(--line); background: #000; }
.question-text { font-size: 18px; font-weight: 600; margin: 16px 0; }
.record-controls { display: flex; gap: 10px; align-items: center; margin: 16px 0; }
.rec-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--bad); display: none; }
.rec-dot.live { display: inline-block; animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.2; } }

.feedback-panel { margin-top: 20px; }
.step-list { list-style: none; padding: 0; margin: 8px 0; }
.step-list li { padding: 6px 10px; border-radius: 6px; margin-bottom: 6px; font-size: 14px; }
.step-list li.covered { background: #f0fdf4; color: var(--good); }
.step-list li.missing { background: #fef2f2; color: var(--bad); }

.set-picker-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.set-picker-card { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--card); cursor: pointer; text-decoration: none; color: inherit; display: block; }
.set-picker-card img { width: 100%; height: 120px; object-fit: cover; display: block; }
.set-picker-card .label { padding: 10px; font-size: 14px; font-weight: 600; }