/* Resale Ledger — plain CSS, mobile-first, light/dark via prefers-color-scheme. */

:root {
  --bg: #f7f7f5;
  --bg-elevated: #ffffff;
  --text: #1a1a1a;
  --text-muted: #55554f;
  --border: #d9d8d2;
  --accent: #0f5e4c;
  --accent-contrast: #ffffff;
  --link: #0a4f8f;
  --warning-bg: #fff6e0;
  --warning-border: #e0c46b;
  --code-bg: #eeede7;
  --max-width: 880px;
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --bg-elevated: #1d2025;
    --text: #eeeeec;
    --text-muted: #a8a8a2;
    --border: #33363c;
    --accent: #4fd8ab;
    --accent-contrast: #06251c;
    --link: #7db8f0;
    --warning-bg: #2a2410;
    --warning-border: #6b5b1f;
    --code-bg: #22252a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 8px 12px;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

a { color: var(--link); }
a:focus, button:focus, input:focus, select:focus {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
}
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--text);
}
.site-header nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
}
.site-header nav a {
  text-decoration: none;
  color: var(--text-muted);
  padding: 4px 2px;
}
.site-header nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
  border-bottom: 2px solid var(--accent);
}

main { padding: 28px 16px 40px; }

h1 { font-size: 1.7rem; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 32px 0 10px; }
h3 { font-size: 1.05rem; margin: 20px 0 8px; }
p { margin: 0 0 14px; }
.lede { color: var(--text-muted); font-size: 1.05rem; }

.callout {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin: 16px 0;
  font-size: 0.92rem;
}
.callout.small { font-size: 0.85rem; padding: 10px 12px; }

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin: 18px 0;
}

.calc-form {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
@media (min-width: 620px) {
  .calc-form { grid-template-columns: 1fr 1fr; }
  .calc-form .field.full { grid-column: 1 / -1; }
}

.field { display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 0.88rem; font-weight: 600; }
.field .hint { font-size: 0.78rem; color: var(--text-muted); font-weight: 400; }
input, select {
  font: inherit;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  width: 100%;
}

.results { margin-top: 22px; }
.results table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.results caption { text-align: left; font-weight: 700; margin-bottom: 6px; }
.results th, .results td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--border); }
.results td.num, .results th.num { text-align: right; font-variant-numeric: tabular-nums; }
.results tfoot td, .results tfoot th { font-weight: 700; border-top: 2px solid var(--border); border-bottom: none; }

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 14px 0;
}
@media (min-width: 480px) {
  .results-grid { grid-template-columns: repeat(4, 1fr); }
}
.stat {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 10px 10px;
  text-align: center;
}
.stat .label { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em; }
.stat .value { font-size: 1.15rem; font-weight: 700; font-variant-numeric: tabular-nums; }

.compare-table-wrap { overflow-x: auto; }
table.compare { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 560px; }
table.compare th, table.compare td { padding: 8px; border-bottom: 1px solid var(--border); text-align: right; }
table.compare th:first-child, table.compare td:first-child { text-align: left; }
table.compare thead th { border-bottom: 2px solid var(--border); }
table.compare tbody tr:hover { background: var(--code-bg); }

.examples-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; margin: 10px 0 20px; }
.examples-table th, .examples-table td { padding: 7px 8px; border-bottom: 1px solid var(--border); text-align: right; }
.examples-table th:first-child, .examples-table td:first-child { text-align: left; }

.platform-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 18px 0;
}
@media (min-width: 560px) {
  .platform-grid { grid-template-columns: 1fr 1fr; }
}
.platform-grid a {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-decoration: none;
  background: var(--bg-elevated);
  color: var(--text);
}
.platform-grid a:hover { border-color: var(--accent); }
.platform-grid .p-name { font-weight: 700; }
.platform-grid .p-desc { color: var(--text-muted); font-size: 0.85rem; }

.affiliate-card {
  border: 1px dashed var(--accent);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 20px 0;
}
.affiliate-card .disclosure {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.sources-list { font-size: 0.9rem; }
.sources-list li { margin-bottom: 6px; }

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  margin-top: 40px;
}
.site-footer .wrap { padding: 20px 16px 30px; }
.site-footer p { font-size: 0.82rem; color: var(--text-muted); margin: 0 0 8px; }

button.primary {
  background: var(--accent);
  color: var(--accent-contrast);
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-weight: 600;
  cursor: pointer;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}