:root {
  --primary: #1f6feb;
  --primary-d: #155bb5;
  --bg: #f2f4f7;
  --card: #ffffff;
  --text: #1f2329;
  --muted: #8a909c;
  --line: #e6e8eb;
  --warn: #e34c4c;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  padding-bottom: env(safe-area-inset-bottom);
}
.app-bar {
  position: sticky; top: 0; z-index: 10;
  background: var(--primary); color: #fff;
  padding: 12px 16px; display: flex; align-items: baseline; gap: 10px;
  padding-top: calc(12px + env(safe-area-inset-top));
}
.brand { font-weight: 700; font-size: 17px; }
.brand-sub { font-size: 12px; opacity: .85; }

.view { display: none; padding: 14px; }
.view.active { display: block; }

.card {
  background: var(--card); border-radius: 14px; padding: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.hint { font-size: 13px; color: var(--muted); margin: 14px 0 8px; }
.hint:first-child { margin-top: 0; }
.tip { font-size: 12px; color: var(--muted); margin-top: 12px; line-height: 1.5; }
.tip.warn { color: #b4533b; background: #fdf0ec; padding: 8px 10px; border-radius: 8px; }

.doc-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.doc-tab {
  padding: 10px; border: 1px solid var(--line); background: #fff; border-radius: 10px;
  font-size: 14px; color: var(--text); cursor: pointer;
}
.doc-tab.active { border-color: var(--primary); background: #eaf2ff; color: var(--primary-d); font-weight: 600; }

textarea {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px;
  font-size: 15px; font-family: inherit; resize: vertical; background: #fafbfc;
}
textarea:focus { outline: none; border-color: var(--primary); background: #fff; }

.row { display: flex; gap: 10px; margin-top: 14px; }
.row.qrr { justify-content: space-between; }
.btn {
  flex: 1; padding: 12px; border-radius: 10px; border: none; font-size: 15px;
  cursor: pointer; font-weight: 600;
}
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:active { background: var(--primary-d); }
.btn.ghost { background: #eef0f3; color: var(--text); }
.btn.danger { background: #fdecec; color: var(--warn); }
.btn.link { background: none; color: var(--primary); font-weight: 500; flex: none; padding: 6px 0; }
.btn:disabled { opacity: .5; }

.field { margin-bottom: 12px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.field textarea { background: #fafbfc; }

.fmt-row { display: flex; gap: 8px; }
.fmt-btn {
  flex: 1; padding: 10px; border: 1px solid var(--line); background: #fff; border-radius: 10px;
  font-size: 14px; cursor: pointer;
}
.fmt-btn.active { border-color: var(--primary); background: #eaf2ff; color: var(--primary-d); font-weight: 600; }

.meta { font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
.meta b { color: var(--text); }
.plain {
  white-space: pre-wrap; word-break: break-all; background: #f6f8fa; border-radius: 8px;
  padding: 10px; font-size: 13px; margin: 8px 0 0; max-height: 200px; overflow: auto;
}

.qr-card { text-align: center; display: flex; flex-direction: column; align-items: center; }
.qr-idx { font-size: 14px; font-weight: 600; margin-bottom: 10px; }
.qr-wrap { background: #fff; padding: 10px; border-radius: 12px; border: 1px solid var(--line); }
#qr-canvas { display: block; }
.burn { width: 100%; margin: 14px 0 4px; }
.burn-track { height: 6px; background: #eceef1; border-radius: 4px; overflow: hidden; }
.burn-bar { height: 100%; width: 100%; background: #2bb673; transition: width 1s linear, background .3s; }
.burn-text { font-size: 12px; color: var(--muted); margin-top: 4px; }
.frame-prompt { font-size: 13px; color: var(--warn); margin: 8px 0; }