:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --text: #1c1f1e;
  --muted: #6b716e;
  --border: #dedcd5;
  --input: #fbfaf7;
  --accent: #1f5f8b;
  --accent-text: #ffffff;
  --glucose: #1f6fb2;
  --insulin: #c7771a;
  --error: #b42318;
  --grid: #ebe9e2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151716;
    --card: #1e2120;
    --text: #e8eae8;
    --muted: #9aa19d;
    --border: #343938;
    --input: #252928;
    --accent: #5fa8dc;
    --accent-text: #0e1a22;
    --glucose: #6cb4ea;
    --insulin: #e9a34b;
    --error: #f97066;
    --grid: #2b302e;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
[hidden] { display: none !important; }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: max(12px, env(safe-area-inset-top)) 16px calc(24px + env(safe-area-inset-bottom));
}
h1 { font-size: 1.35rem; margin: 0; }
h2 { font-size: 1.05rem; margin: 0 0 12px; }
.muted { color: var(--muted); margin: 0; font-size: 0.9rem; }
.hint { font-size: 0.8rem; margin-top: 6px; }
.error { color: var(--error); margin: 4px 0 10px; font-size: 0.92rem; }
.unit { color: var(--muted); font-weight: 400; font-size: 0.85rem; }

.top {
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; margin: 4px 0 14px;
}
.top-actions { display: flex; gap: 8px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}

.field { margin-bottom: 12px; }
label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 4px; }
input {
  width: 100%;
  min-width: 0;
  font: inherit;
  font-size: 17px; /* >= 16px keeps iOS from zooming into the field */
  color: var(--text);
  background: var(--input);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 12px;
  -webkit-appearance: none;
  appearance: none;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
input[type="datetime-local"] { min-height: 46px; }

.row { display: flex; gap: 8px; align-items: stretch; }
.row input { flex: 1; }
.grow { flex: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

button, .button {
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center;
  white-space: nowrap;
  touch-action: manipulation;
}
button.primary {
  background: var(--accent); color: var(--accent-text); border-color: var(--accent);
  padding: 12px 16px;
}
button.ghost { background: transparent; }
button:disabled { opacity: 0.6; }

.chart-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.chart-head h2 { margin: 0; }
.ranges { display: flex; gap: 4px; flex-wrap: wrap; }
.ranges button { padding: 6px 9px; font-size: 0.85rem; border-radius: 8px; }
.ranges button.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.chart { width: 100%; height: 340px; }

.day { margin-top: 14px; }
.day:first-child { margin-top: 0; }
.day-head { font-size: 0.85rem; color: var(--muted); font-weight: 600; margin-bottom: 4px; }
.entry {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 9px 0;
  border-top: 1px solid var(--grid);
}
.entry-time { font-variant-numeric: tabular-nums; font-weight: 600; }
.entry-values { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.pill { font-size: 0.88rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; font-variant-numeric: tabular-nums; }
.pill.glucose { color: var(--glucose); border: 1px solid var(--glucose); }
.pill.insulin { color: var(--insulin); border: 1px solid var(--insulin); }
.entry-note { color: var(--muted); font-size: 0.88rem; width: 100%; }
.entry-actions { display: flex; gap: 4px; }
.entry-actions button { padding: 6px 9px; font-size: 0.82rem; }
.entry.editing { background: color-mix(in srgb, var(--accent) 10%, transparent); border-radius: 8px; }

.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; }
.login-card h1 { margin-bottom: 2px; }
.login-card p.muted { margin-bottom: 18px; }
.login-card button { width: 100%; margin-top: 12px; }

@media (max-width: 420px) {
  .top h1 { font-size: 1.2rem; }
  .chart { height: 300px; }
  .top-actions .button, .top-actions button { padding: 8px 10px; font-size: 0.88rem; }
}