:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --fg: #1c2024;
  --muted: #646b75;
  --border: #dfe3e8;
  --grid: rgba(0, 0, 0, 0.07);
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --ok: #15803d;
  --bad: #b91c1c;
  --radius: 8px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --surface: #1b1e23;
    --fg: #e6e8eb;
    --muted: #99a1ab;
    --border: #2d3239;
    --grid: rgba(255, 255, 255, 0.08);
    --accent: #3b82f6;
    --ok: #4ade80;
    --bad: #f87171;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
h1, h2, h3 { margin: 0; line-height: 1.2; }
h2 { font-size: 15px; }
p { margin: 0; }
a { color: var(--accent); }
code { font-size: 12px; }
.muted { color: var(--muted); }
small { display: block; color: var(--muted); font-size: 12px; }

button {
  font: inherit;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 11px;
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--muted); }
button:disabled { opacity: 0.45; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
button.ghost { border-color: transparent; background: none; color: var(--muted); }
button.link { border: 0; background: none; padding: 0; color: var(--accent); font-size: inherit; text-decoration: underline; }
button:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

input, select {
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 8px;
  width: 100%;
  margin-top: 4px;
}
input:user-invalid { border-color: var(--bad); }
label { display: block; font-size: 13px; }

.topbar {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.brand { font-weight: 700; font-size: 17px; }
.tagline { font-size: 13px; }

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
  max-width: 1300px;
  width: 100%;
  margin: 0 auto;
  align-items: start;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}
.side { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}
.stack { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.add-reading { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; align-items: end; }
.add-reading .wide { grid-column: 1 / -1; }
h3 { font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
small.inline { display: inline; }
.settings { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.settings .wide { grid-column: 1 / -1; }

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
th, td { padding: 5px 8px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-size: 12px; font-weight: 600; color: var(--muted); }
.num { text-align: right; }
#readings-wrap { max-height: 320px; overflow-y: auto; }
.readings td.actions { width: 1%; }
.readings td.actions button + button { margin-left: 4px; }
tr.editing td { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.readings button { padding: 1px 7px; }
tr.warn td { color: var(--bad); }

.status:empty { display: none; }
.status.error { color: var(--bad); border-color: var(--bad); }

.changes { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.change { border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 12px; }
.change .years { font-weight: 600; margin-bottom: 4px; }
.change .big { font-size: 22px; font-weight: 650; font-variant-numeric: tabular-nums; }
.change.saved .big, .change.saved .verdict { color: var(--ok); }
.change.worse .big, .change.worse .verdict { color: var(--bad); }

.chart { width: 100%; min-height: 240px; }
.uplot { font-family: inherit; }
.u-legend { font-size: 12px; color: var(--fg); }

.footer { padding: 12px 16px 20px; font-size: 12px; text-align: center; }