:root {
  --bg: #f6f7f5;
  --surface: #ffffff;
  --text: #1c2321;
  --muted: #5d6763;
  --border: #dde2df;
  --accent: #0b7a53;
  --accent-soft: #e3f2ec;
  --minus: #a23b2a;
  --plus: #0b7a53;
  --warn-bg: #fff4dc;
  --warn-text: #7a5300;
  --radius: 12px;
  --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(20, 30, 25, 0.06), 0 2px 8px rgba(20, 30, 25, 0.04);
  color-scheme: light;
}

/* Light palette on :root; dark palette for a dark OS setting unless the viewer chose light, and for an explicit dark choice. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121615;
    --surface: #1b201f;
    --text: #e8ecea;
    --muted: #9aa5a0;
    --border: #2d3532;
    --accent: #3ec48f;
    --accent-soft: #183229;
    --minus: #f08a76;
    --plus: #3ec48f;
    --warn-bg: #3a2f14;
    --warn-text: #f3cf7a;
    --shadow: none;
    --on-accent: #0c1411;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #121615;
  --surface: #1b201f;
  --text: #e8ecea;
  --muted: #9aa5a0;
  --border: #2d3532;
  --accent: #3ec48f;
  --accent-soft: #183229;
  --minus: #f08a76;
  --plus: #3ec48f;
  --warn-bg: #3a2f14;
  --warn-text: #f3cf7a;
  --shadow: none;
  --on-accent: #0c1411;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.wrap {
  max-width: 1080px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

h1, h2, h3 { line-height: 1.2; margin: 0; }
h1 { font-size: 1.4rem; }
h2 { font-size: 1.3rem; margin-top: 24px; }
h3 { font-size: 1rem; margin-bottom: 8px; }

.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.header-row {
  display: flex; flex-wrap: wrap; gap: 16px;
  align-items: flex-end; justify-content: space-between;
  padding-top: 20px; padding-bottom: 12px;
}
.subtitle { margin: 2px 0 0; color: var(--muted); }
.header-controls { display: flex; gap: 16px; align-items: flex-end; }
.control { display: flex; flex-direction: column; gap: 4px; font-size: 0.8rem; color: var(--muted); }

.tabs { display: flex; gap: 4px; overflow-x: auto; }
.tabs button {
  appearance: none; border: 0; background: none; color: var(--muted);
  font: inherit; font-weight: 600; padding: 10px 14px; cursor: pointer;
  border-bottom: 3px solid transparent; white-space: nowrap;
}
.tabs button[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.tabs button:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

.intro { color: var(--muted); margin: 6px 0 16px; }

.layout { display: grid; gap: 20px; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); align-items: start; }
@media (max-width: 760px) { .layout { grid-template-columns: minmax(0, 1fr); } }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow);
}

.form { display: flex; flex-direction: column; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 4px; border: 0; padding: 0; margin: 0; min-width: 0; }
.field > span, .field > legend { font-size: 0.85rem; font-weight: 600; padding: 0; }
.field small { color: var(--muted); font-size: 0.78rem; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
[hidden] { display: none !important; }

input[type="number"], select {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; width: 100%;
}
input:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.check { display: flex; gap: 8px; align-items: flex-start; font-size: 0.9rem; cursor: pointer; }
.check input { margin-top: 4px; accent-color: var(--accent); }

.segmented { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; width: fit-content; max-width: 100%; }
.segmented label, .segmented button {
  appearance: none; border: 0; background: var(--surface); color: var(--text);
  font: inherit; font-size: 0.9rem; cursor: pointer; position: relative;
}
.segmented label span, .segmented button { display: block; padding: 6px 12px; }
.segmented label + label, .segmented button + button { border-left: 1px solid var(--border); }
.segmented input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.segmented input:checked + span, .segmented button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); }
.segmented input:focus-visible + span, .segmented button:focus-visible { outline: 2px solid var(--accent); outline-offset: -3px; }

.results { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.stats { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; display: flex; flex-direction: column; gap: 2px; box-shadow: var(--shadow);
}
.stat.primary { background: var(--accent-soft); border-color: var(--accent); }
.stat-label { font-size: 0.8rem; color: var(--muted); font-weight: 600; }
.stat-value { font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat.primary .stat-value { color: var(--accent); }
.stat-extra { font-size: 0.8rem; color: var(--muted); }

.breakdown { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.breakdown th, .breakdown td { padding: 7px 4px; border-bottom: 1px solid var(--border); vertical-align: top; }
.breakdown th { text-align: left; font-weight: 500; }
.breakdown td { text-align: right; white-space: nowrap; }
.breakdown tr:last-child th, .breakdown tr:last-child td { border-bottom: 0; }
.breakdown tr.sub th, .breakdown tr.sub td { color: var(--muted); font-size: 0.88rem; padding-left: 16px; }
.breakdown tr.sub td { padding-left: 4px; }
.breakdown tr.minus td { color: var(--minus); }
.breakdown tr.plus td { color: var(--plus); }
.breakdown tr.total th, .breakdown tr.total td { font-weight: 700; }
.breakdown thead th { font-size: 0.85rem; color: var(--muted); text-align: right; }
.breakdown thead th.winner { color: var(--accent); }
.compare td { width: 30%; }
.card:has(.compare) { overflow-x: auto; }

.alert { margin: 0; padding: 12px 14px; border-radius: var(--radius); font-weight: 600; }
.alert.verdict { background: var(--accent-soft); color: var(--accent); }
.alert.warn { background: var(--warn-bg); color: var(--warn-text); }
.footnote { margin: 0; color: var(--muted); font-size: 0.82rem; }

.faq { margin-top: 40px; max-width: 760px; }
.faq h2 { margin-bottom: 12px; }
.faq details { border-bottom: 1px solid var(--border); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.faq details p { margin: 8px 0 0; color: var(--muted); }
.notes a { color: var(--accent); }

.notes { margin: 32px 0 40px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }
.notes p { margin: 0 0 8px; }

@media (max-width: 480px) {
  .stat-value { font-size: 1.3rem; }
  .tabs button { padding: 10px 10px; }
  .breakdown { font-size: 0.9rem; }
  .compare { font-size: 0.8rem; }
  .compare td { width: auto; padding-left: 2px; padding-right: 2px; }
  .compare tr.sub th { padding-left: 8px; }
}