:root {
  --bg: #f4f6f5;
  --card: #ffffff;
  --text: #1c2624;
  --muted: #5d6b68;
  --border: #d9e0de;
  --primary: #0f766e;
  --primary-text: #ffffff;
  --primary-soft: #e3f2f0;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --warn: #8a5a00;
  --warn-soft: #fff4d6;
  --info: #1d4f91;
  --info-soft: #e8f0fb;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111615;
    --card: #1b2220;
    --text: #e6ecea;
    --muted: #9aa8a5;
    --border: #2f3a37;
    --primary: #2bb3a3;
    --primary-text: #062421;
    --primary-soft: #16302c;
    --danger: #ff8a7a;
    --danger-soft: #3a1c19;
    --warn: #f2c14e;
    --warn-soft: #332a12;
    --info: #8db8f5;
    --info-soft: #172538;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  font-size: 17px;
  line-height: 1.5;
}
main { max-width: 640px; margin: 0 auto; padding: 12px 16px 24px; }
h1 { font-size: 1.15rem; margin: 0; }
h2 { font-size: 1.05rem; margin: 0 0 8px; }
small { color: var(--muted); font-weight: normal; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.topbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; padding-top: max(12px, env(safe-area-inset-top));
  background: var(--primary); color: var(--primary-text);
}
.profile-pick select {
  background: rgba(255,255,255,.15); color: inherit; border: 1px solid rgba(255,255,255,.4);
  border-radius: 999px; padding: 6px 12px; font-size: .95rem; max-width: 45vw;
}
.profile-pick option { color: #000; }

.tabs {
  display: flex; max-width: 640px; margin: 0 auto; padding: 8px 16px 0; gap: 8px;
}
.tabs button {
  flex: 1; padding: 10px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--card); color: var(--text); font-size: 1rem; cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--primary); border-color: var(--primary); color: var(--primary-text); font-weight: 600; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; margin-bottom: 12px;
}
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.card-head h2 { margin: 0; }

.field { display: block; margin-bottom: 12px; }
.label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 4px; }
input[type=number], input[type=text], input[type=datetime-local], select {
  width: 100%; padding: 10px 12px; font-size: 1.05rem;
  border: 1px solid var(--border); border-radius: 10px; background: var(--bg); color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
fieldset { border: none; padding: 0; margin: 0 0 8px; }
legend { font-weight: 700; margin-bottom: 8px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0 8px; }
@media (max-width: 420px) { .grid4 { grid-template-columns: 1fr 1fr; } }

.segmented { display: flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.segmented label { flex: 1; }
.segmented input { position: absolute; opacity: 0; }
.segmented span { display: block; text-align: center; padding: 9px 4px; cursor: pointer; border-right: 1px solid var(--border); }
.segmented label:last-child span { border-right: none; }
.segmented input:checked + span { background: var(--primary); color: var(--primary-text); font-weight: 600; }
.segmented input:focus-visible + span { outline: 2px solid var(--primary); outline-offset: -3px; }

.iob-line { font-size: .92rem; color: var(--muted); background: var(--primary-soft); padding: 8px 12px; border-radius: 10px; }
.iob-line strong { color: var(--text); }

.carb-total { font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.food-list, .log-list { list-style: none; margin: 0 0 12px; padding: 0; }
.food-list li, .log-list li {
  display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--border);
}
.food-list li > div:first-child, .log-main { flex: 1; min-width: 0; }
.food-name { font-weight: 600; }
.food-carbs { font-weight: 700; white-space: nowrap; }
.log-time { width: 5.5em; font-size: .9rem; color: var(--muted); }
.icon-btn {
  border: none; background: transparent; color: var(--muted); font-size: 1rem;
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer;
}
.icon-btn:hover { background: var(--danger-soft); color: var(--danger); }
.food-form { border-top: 1px dashed var(--border); padding-top: 12px; display: grid; gap: 10px; }
.food-form .field { margin: 0; }
.food-inputs { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
.food-preview { color: var(--primary); font-weight: 600; min-height: 1.2em; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 16px; font-size: 1rem; border-radius: 10px; cursor: pointer;
  border: 1px solid transparent; font-weight: 600;
}
.btn.primary { background: var(--primary); color: var(--primary-text); }
.btn.secondary { background: var(--card); color: var(--primary); border-color: var(--primary); }
.btn.danger { background: var(--danger); color: #fff; }
.btn.danger-outline { background: var(--card); color: var(--danger); border-color: var(--danger); }
.btn.big { width: 100%; padding: 16px; font-size: 1.15rem; margin-bottom: 12px; }
.btn.small { padding: 6px 12px; font-size: .9rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; }
.btn-row.end { justify-content: flex-end; margin-top: 16px; }
.file-btn { cursor: pointer; }

.alert { padding: 10px 12px; border-radius: 10px; margin: 8px 0; font-size: .95rem; }
.alert ul { margin: 0; padding-left: 1.2em; }
.alert.warn { background: var(--warn-soft); color: var(--warn); }
.alert.danger { background: var(--danger-soft); color: var(--danger); font-weight: 600; }
.alert.info { background: var(--info-soft); color: var(--info); }

.result { border-radius: var(--radius); padding: 16px; margin-bottom: 12px; border: 2px solid; scroll-margin-top: 70px; }
.result.ok { border-color: var(--primary); background: var(--card); }
.result.blocked { border-color: var(--danger); background: var(--danger-soft); }
.result-head { font-weight: 700; text-align: center; }
.result.blocked .result-head { color: var(--danger); font-size: 1.15rem; }
.block-reason { font-size: 1.05rem; }
.dose { text-align: center; font-size: 1.4rem; font-weight: 700; color: var(--primary); }
.dose span { font-size: 3.6rem; line-height: 1.1; }
.steps { margin: 10px 0; font-size: .93rem; }
.steps summary { cursor: pointer; font-weight: 600; }
.steps ol, .steps ul { margin: 6px 0; padding-left: 1.4em; }
.log-row { display: flex; gap: 10px; align-items: flex-end; margin-top: 12px; }
.log-row .field { flex: 1; margin: 0; }
.log-row .btn { padding: 11px 14px; }

dialog {
  border: none; border-radius: var(--radius); padding: 0; width: min(92vw, 440px); max-height: 90vh; overflow: auto;
  background: var(--card); color: var(--text);
}
dialog::backdrop { background: rgba(0,0,0,.45); }
.dialog-body { padding: 20px; }
.dialog-body h3 { margin: 0 0 12px; }
.diff { width: 100%; border-collapse: collapse; font-size: .95rem; }
.diff td { padding: 6px 4px; border-bottom: 1px solid var(--border); }

.disclaimer {
  max-width: 640px; margin: 0 auto; padding: 0 16px 32px; font-size: .82rem; color: var(--muted); text-align: center;
}
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translateX(-50%);
  background: var(--text); color: var(--bg); padding: 10px 20px; border-radius: 999px; z-index: 20;
}

.btn.full { width: 100%; margin-bottom: 12px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.label-thumb { cursor: zoom-in; display: block; width: 100%; max-height: 200px; object-fit: contain; border-radius: 10px; background: var(--bg); margin-bottom: 8px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 600; margin-top: 8px; }
.check input { width: 20px; height: 20px; margin-top: 2px; flex: none; }
code { font-size: .9em; }
.label-thumb.zoom { max-height: none; cursor: zoom-out; }