:root {
  --bg: #f7f5f0;
  --card: #ffffff;
  --ink: #26221e;
  --muted: #776d64;
  --line: #e4ddd2;
  --field: #fbf9f5;
  --accent: #b45309;
  --accent-soft: #fdf1e3;
  --warn: #b91c1c;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151310;
    --card: #1f1b17;
    --ink: #f2ece4;
    --muted: #a59a8e;
    --line: #382f28;
    --field: #191612;
    --accent: #f59e0b;
    --accent-soft: #2a2117;
    --warn: #f87171;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

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

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 28px 16px 48px;
  display: grid;
  gap: 18px;
}

a {
  color: inherit;
}

code {
  font-size: 0.92em;
  background: var(--accent-soft);
  padding: 1px 5px;
  border-radius: 5px;
}

header .kicker {
  margin: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 4px 0 6px;
  font-size: clamp(28px, 5.5vw, 40px);
  line-height: 1.1;
}

.lede {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

/* ---------- inputs ---------- */

.levels {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 14px;
}

.level {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 8px;
  align-items: baseline;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--field);
}

.level .lvl {
  font-weight: 700;
}

.level .pw {
  color: var(--muted);
  font-size: 12px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.level input {
  grid-column: 1 / -1;
}

input,
select {
  font: inherit;
  width: 100%;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.field {
  display: grid;
  gap: 4px;
  font-size: 14px;
}

.field > span {
  color: var(--muted);
}

.field small {
  color: var(--muted);
}

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 16px;
  margin-bottom: 14px;
}

.check {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 14px;
}

.check input {
  width: auto;
}

button.link {
  font: inherit;
  font-size: 13px;
  justify-self: start;
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
}

/* ---------- outputs ---------- */

.tiles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.tile {
  display: grid;
  gap: 2px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--field);
  border: 1px solid var(--line);
}

.tile.strong {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.tile .label {
  color: var(--muted);
  font-size: 13px;
}

.tile .value {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

.note,
.muted {
  color: var(--muted);
  font-size: 14px;
  margin: 10px 0 0;
}

.merge-out dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 16px;
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.merge-out dt {
  color: var(--muted);
}

.merge-out dd {
  margin: 0;
}

.verdict {
  margin: 14px 0 0;
  padding: 10px 12px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 8px 8px 0;
  font-size: 14px;
}

table.swap {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.swap th,
.swap td {
  text-align: left;
  padding: 7px 8px;
  border-bottom: 1px solid var(--line);
}

.swap th {
  color: var(--muted);
  font-weight: 600;
  font-size: 14px;
}

.swap td:last-child {
  font-weight: 700;
}

.model ul {
  padding-left: 20px;
  margin: 8px 0;
}

.model li {
  margin-bottom: 4px;
}

.sources {
  font-size: 14px;
  color: var(--muted);
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 640px) {
  .levels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid2,
  .tiles {
    grid-template-columns: 1fr 1fr;
  }

  .grid2 .field:first-child,
  .grid2 .field:nth-child(2),
  .grid2 .field.full {
    grid-column: 1 / -1;
  }

  .merge-out dl {
    grid-template-columns: 1fr;
  }

  .merge-out dd {
    margin-bottom: 6px;
  }

  .tile .value {
    font-size: 19px;
  }
}