:root {
  --primary: #1a56db;
  --primary-dark: #1643a8;
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --ok: #16a34a;
  --warn: #d97706;
  --danger: #dc2626;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
  margin: 0;
  font-family: -apple-system, "PingFang SC", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 17px;
  line-height: 1.6;
}

#progress-bar {
  position: fixed; top: 0; left: 0; right: 0; height: 6px; background: #e5e7eb; z-index: 50;
}
#progress-fill {
  height: 100%; width: 0; background: var(--primary);
  transition: width .4s ease;
}
header {
  position: fixed; top: 6px; left: 0; right: 0; z-index: 40;
  background: rgba(255,255,255,.92); backdrop-filter: blur(8px);
  padding: 14px 20px; font-size: 15px; font-weight: 600; color: var(--muted);
  border-bottom: 1px solid var(--border);
}
main {
  max-width: 760px; margin: 0 auto; padding: 86px 18px 60px;
}
h2 { font-size: 22px; margin: 6px 0 14px; }
h3 { font-size: 18px; margin: 4px 0 8px; }
p { margin: 8px 0; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; margin: 14px 0; box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.card h4 { margin: 12px 0 6px; font-size: 16px; }
.card ul, .card ol { margin: 6px 0 6px 20px; padding: 0; }
.card li { margin: 4px 0; }

.form-row { margin: 14px 0; }
.form-row label { display: block; font-weight: 500; margin-bottom: 6px; }
.form-row input[type=text], .form-row input[type=number], .form-row select, .form-row textarea {
  width: 100%; padding: 12px 14px; font-size: 17px; border: 1px solid var(--border);
  border-radius: 10px; background: #fff; color: var(--text); font-family: inherit;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none; border-color: var(--primary);
}
.form-row textarea { resize: vertical; }

.btn-row { display: flex; gap: 12px; margin: 22px 0; flex-wrap: wrap; }
.btn {
  flex: 1; min-width: 180px; padding: 14px 18px; font-size: 17px; font-weight: 600;
  border: none; border-radius: 12px; background: var(--primary); color: #fff;
  cursor: pointer;
}
.btn:disabled { background: #c7d2fe; cursor: not-allowed; }
.btn-ghost { background: #fff; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-ghost:disabled { color: #a5b4fc; border-color: #c7d2fe; background: #fff; }
.btn-record { background: var(--danger); }
.btn-stop { background: var(--warn); }

/* 量表 */
.scale-block { margin: 18px 0; }
.scale-block h4 { margin: 0 0 10px; }
.q-item { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin: 10px 0; }
.q-item .q-text { font-weight: 500; margin-bottom: 10px; }
.likert { display: flex; justify-content: space-between; align-items: center; gap: 2px; }
.likert .opt { flex: 1; text-align: center; font-size: 15px; }
.likert .opt input { transform: scale(1.4); margin: 4px 0; }
.likert .lbl { font-size: 12px; color: var(--muted); }
.semantic { display: flex; align-items: center; gap: 8px; }
.semantic .side { flex: 0 0 96px; font-size: 14px; color: var(--muted); text-align: center; }
.semantic .opts { flex: 1; display: flex; justify-content: space-between; }
.semantic .opts input { transform: scale(1.5); }
.slider-row { display: flex; align-items: center; gap: 14px; }
.slider-row input[type=range] { flex: 1; height: 34px; }
.slider-row .val { min-width: 52px; text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }

/* 签名板 */
.sign-box { border: 1.5px dashed var(--border); border-radius: 12px; background: #fff; margin: 4px 0; overflow: hidden; }
.sign-box canvas { display: block; width: 100%; height: auto; touch-action: none; background: #fff; }
.sign-tools { display: flex; align-items: center; gap: 12px; margin-top: 8px; }
.sign-tools #sign-status { font-size: 14px; color: var(--muted); }
.btn-sm { flex: 0 0 auto; min-width: 0; padding: 8px 14px; font-size: 14px; }

/* 任务 */
.task-progress { display: flex; gap: 8px; margin: 10px 0; }
.task-progress .dot { flex: 1; height: 6px; border-radius: 3px; background: var(--border); }
.task-progress .dot.active { background: var(--primary); }
.task-progress .dot.done { background: var(--ok); }
#task-examples { margin: 8px 0; }
#task-examples .ex-hint { font-size: 14px; color: var(--muted); margin: 0 0 4px; }
#task-controls .btn-row { margin: 12px 0; }
#rec-status { font-size: 15px; color: var(--muted); margin: 10px 0 0; }
#rec-status.recording { color: var(--danger); font-weight: 600; }
#rec-done-actions { display: flex; gap: 12px; margin-top: 14px; }
#rec-done-actions[hidden] { display: none; }
#rec-done-actions .btn { flex: 1; }
#rec-start, #rec-stop { width: 100%; }

@media (max-width: 520px) {
  main { padding: 86px 12px 50px; }
  .btn { min-width: 140px; padding: 13px 12px; }
}