:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --pri: #3b6ef6;
  --pri-d: #2b56c9;
  --text: #1f2733;
  --muted: #7a8699;
  --line: #e3e7ee;
  --ai: #eef2fe;
  --user: #d9f4e5;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: #fff; border-bottom: 1px solid var(--line);
  padding: 10px 16px;
}
.brand { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.progress { height: 5px; background: #eef0f4; border-radius: 3px; overflow: hidden; }
.progress > div { height: 100%; width: 0; background: var(--pri); transition: width .3s; }
#app { max-width: 720px; margin: 0 auto; padding: 16px; }
.card {
  background: var(--card); border-radius: 14px; padding: 22px;
  box-shadow: 0 2px 14px rgba(20, 40, 80, .06); margin-bottom: 18px;
}
h2 { font-size: 19px; margin: 0 0 6px; }
.sub { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.body { margin: 0 0 12px; }
.small { font-size: 13px; color: var(--muted); }
.field { padding: 12px 0; border-bottom: 1px dashed var(--line); }
.field:last-child { border-bottom: none; }
.qtext { font-size: 15px; margin-bottom: 8px; }
.opts { display: flex; flex-wrap: wrap; gap: 10px; }
.opts.col { flex-direction: column; }
.opt { display: flex; align-items: center; gap: 6px; background: #f7f9fc; border: 1px solid var(--line); border-radius: 9px; padding: 9px 12px; cursor: pointer; }
.opt:hover { border-color: var(--pri); }
.opt input { accent-color: var(--pri); }
.likert { display: flex; gap: 6px; margin-top: 4px; }
.lik { flex: 1; text-align: center; border: 1px solid var(--line); border-radius: 8px; padding: 8px 0; cursor: pointer; font-size: 14px; }
.lik input { display: none; }
.lik:has(input:checked) { background: var(--pri); color: #fff; border-color: var(--pri); }
.lik.att { border-color: #f0b429; }
.anchors { display: flex; justify-content: space-between; font-size: 12px; color: var(--muted); margin-top: 4px; }
.slider-row { display: flex; align-items: center; gap: 10px; }
.slider { flex: 1; accent-color: var(--pri); }
.slider-lab { font-size: 12px; color: var(--muted); white-space: nowrap; }
.slider-val { min-width: 34px; text-align: center; font-weight: 600; color: var(--pri); }
.text, textarea, input[type="number"] { width: 100%; border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px; font-size: 15px; font-family: inherit; background: #fff; }
textarea { resize: vertical; }
.actions { margin-top: 18px; text-align: right; }
.btn { background: var(--pri); color: #fff; border: none; border-radius: 9px; padding: 11px 22px; font-size: 15px; cursor: pointer; }
.btn:hover { background: var(--pri-d); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: #fff; color: var(--pri); border: 1px solid var(--pri); margin-left: 8px; }
.check { display: flex; gap: 8px; align-items: flex-start; padding: 10px 0; }
.check input { margin-top: 4px; accent-color: var(--pri); }
.infobox { display: flex; gap: 14px; align-items: flex-start; }
.ai-avatar { flex: 0 0 48px; width: 48px; height: 48px; border-radius: 50%; background: var(--pri); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 20px; }
.chat { display: flex; flex-direction: column; gap: 12px; margin-bottom: 12px; }
.msg { display: flex; }
.msg.user { justify-content: flex-end; }
.msg.ai { justify-content: flex-start; }
.bubble { max-width: 86%; padding: 10px 14px; border-radius: 14px; }
.msg.user .bubble { background: var(--user); border-bottom-right-radius: 4px; }
.msg.ai .bubble { background: var(--ai); border-bottom-left-radius: 4px; }
.ai-name { font-size: 12px; color: var(--pri); font-weight: 600; margin-bottom: 2px; }
.audio-row { margin-top: 8px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.mini { background: #fff; border: 1px solid var(--pri); color: var(--pri); border-radius: 7px; padding: 5px 12px; font-size: 13px; cursor: pointer; }
.mini.play { background: var(--pri); color: #fff; font-weight: 600; padding: 7px 16px; }
.mini.play:active { opacity: .8; }
.audio-status { font-size: 12px; color: #6b7a90; }
.audio-status.warn { color: #c2410c; font-weight: 600; }
.audio-status.done { color: #15803d; font-weight: 600; }
.site-footer { text-align: center; font-size: 12px; color: #93a0b4; padding: 18px 12px 26px; line-height: 1.9; }
.site-footer a { color: #93a0b4; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.site-footer .sep { margin: 0 8px; color: #cbd4e1; }
.cue { background: #fff7e6; border: 1px solid #ffe0a3; color: #8a5a00; border-radius: 9px; padding: 10px 12px; font-size: 14px; margin-bottom: 10px; }
.round-hint { background: #eef2fe; border: 1px solid #cdd9fb; color: #2b56c9; border-radius: 9px; padding: 8px 12px; font-size: 13px; margin-bottom: 8px; text-align: center; font-weight: 600; }
.dialogue-controls { position: sticky; bottom: 0; background: var(--card); padding-top: 8px; }
.code { font-family: ui-monospace, Consolas, monospace; font-size: 20px; font-weight: 700; letter-spacing: 1px; background: #f7f9fc; border: 1px dashed var(--pri); border-radius: 9px; padding: 12px; text-align: center; margin: 12px 0; }
.choice-list { display: flex; flex-direction: column; gap: 10px; }
.center { text-align: center; }