:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #f8f9fb;
  --text: #1c2330;
  --muted: #5f6b7a;
  --border: #dde1e7;
  --accent: #1f5fa8;
  --accent-soft: #e6effa;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --warn: #9a5b00;
  --warn-soft: #fff4de;
  --info: #35577f;
  --info-soft: #eef3f9;
  --ok: #17703d;
  --ok-soft: #e7f5ec;
  --ext: #8a4b00;
  --ext-soft: #fff1dc;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05);
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --surface: #171b21;
    --surface-2: #1d222a;
    --text: #e6e9ee;
    --muted: #9aa4b2;
    --border: #2b323c;
    --accent: #7eb0ff;
    --accent-soft: #1b2a40;
    --danger: #ff8a80;
    --danger-soft: #3a1b1b;
    --warn: #f5b04c;
    --warn-soft: #36270f;
    --info: #9dbbe0;
    --info-soft: #1a2432;
    --ok: #6ad492;
    --ok-soft: #14301f;
    --ext: #f3b35c;
    --ext-soft: #33240f;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }

a { color: var(--accent); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ------------------------------------------------------------ header/footer */

.site-header { padding: 28px 0 8px; }
.brand { margin: 0 0 6px; font-weight: 700; letter-spacing: -0.01em; color: var(--muted); }
.brand span { color: var(--accent); }
.site-header h1 { margin: 0 0 6px; font-size: 1.6rem; line-height: 1.25; letter-spacing: -0.015em; }
.lede { margin: 0; color: var(--muted); max-width: 70ch; }

.site-footer { padding: 24px 0 40px; color: var(--muted); font-size: 0.9rem; }

/* ------------------------------------------------------------ cards */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin: 16px 0;
}
.card h2 { margin: 0 0 12px; font-size: 1.05rem; display: flex; align-items: center; gap: 8px; }
.step {
  display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font-size: 0.8rem; font-weight: 700;
}

.layout { display: grid; gap: 0 16px; grid-template-columns: 1fr; }
@media (min-width: 960px) {
  .layout { grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); align-items: start; }
  .layout .col:last-child .card { position: sticky; top: 16px; }
}

/* ------------------------------------------------------------ form */

textarea, input, select {
  font: inherit; color: inherit; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; width: 100%;
}
textarea { resize: vertical; min-height: 86px; font-size: 1rem; }
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
input[type="radio"], input[type="checkbox"] { width: auto; accent-color: var(--accent); }

.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 14px; }
.field { min-width: 0; margin: 0; padding: 0; border: 0; }
.field.wide { grid-column: 1 / -1; }
@media (max-width: 520px) { .fields { grid-template-columns: 1fr; } }
.field > label, .field > legend { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 4px; }
.unit { color: var(--muted); font-weight: 400; }
.req { color: var(--danger); font-weight: 500; font-size: 0.8rem; margin-left: 4px; }
.hint { margin: 4px 0 0; font-size: 0.82rem; color: var(--muted); }
.check { display: flex; gap: 8px; align-items: center; font-size: 0.9rem; }
.input-row { display: flex; gap: 8px; align-items: center; }
.input-row input { flex: 1; }
.is-user { border-color: var(--accent); }

.segmented { display: flex; flex-wrap: wrap; gap: 6px; }
.segmented label {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--surface-2); cursor: pointer; font-size: 0.9rem;
}
.segmented label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
#custom-f { margin-top: 8px; max-width: 180px; }

button.link {
  background: none; border: 0; padding: 0; color: var(--accent); font: inherit; font-size: 0.85rem;
  cursor: pointer; text-decoration: underline; white-space: nowrap;
}

.examples { display: flex; gap: 8px; align-items: baseline; margin-top: 10px; flex-wrap: wrap; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  font: inherit; font-size: 0.82rem; border: 1px solid var(--border); background: var(--surface-2);
  color: var(--text); border-radius: 999px; padding: 4px 10px; cursor: pointer; text-align: left;
}
.chip:hover { border-color: var(--accent); }

/* ------------------------------------------------------------ labels, banners */

.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

.src {
  display: inline-block; font-size: 0.74rem; line-height: 1.3; padding: 1px 7px; border-radius: 999px;
  background: var(--info-soft); color: var(--info); border: 1px solid transparent; margin: 2px 4px 2px 0;
  vertical-align: middle;
}
.src.ext { background: var(--ext-soft); color: var(--ext); border-color: color-mix(in srgb, var(--ext) 35%, transparent); }
.src.user { background: var(--accent-soft); color: var(--accent); }
.src-line { margin-top: 4px; font-size: 0.82rem; color: var(--muted); }

.banner { border-radius: 8px; padding: 10px 12px; margin: 10px 0 0; font-size: 0.9rem; }
.banner.danger { background: var(--danger-soft); color: var(--danger); }
.banner.warn { background: var(--warn-soft); color: var(--warn); }
.banner.info { background: var(--info-soft); color: var(--info); }
.banner.ok { background: var(--ok-soft); color: var(--ok); }
.banner p { margin: 0; }
.banner p + p { margin-top: 4px; }

.flag { display: flex; gap: 8px; align-items: flex-start; }
.flag input { margin-top: 3px; }

.facts { display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; margin: 14px 0 0; font-size: 0.88rem; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }

/* ------------------------------------------------------------ results */

.headline { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 520px) { .headline { grid-template-columns: 1fr; } }
.metric { background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.metric.primary { grid-column: 1 / -1; }
.metric .label { font-size: 0.8rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; }
.metric .value { font-size: 1.9rem; font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; line-height: 1.2; }
.metric.primary .value { font-size: 2.3rem; }
.metric .sub { font-size: 0.9rem; font-variant-numeric: tabular-nums; }
.metric .alt { color: var(--muted); font-size: 0.95rem; font-weight: 500; }
.metric.danger { border-color: var(--danger); }
.tag-excl { display: inline-block; font-size: 0.75rem; font-weight: 700; color: var(--warn); background: var(--warn-soft); padding: 1px 6px; border-radius: 4px; }

.pending { color: var(--muted); padding: 8px 0; }
.pending li { margin: 4px 0; }

.inputs-used { margin: 14px 0 0; padding: 0; list-style: none; font-size: 0.86rem; }
.inputs-used li { padding: 5px 0; border-top: 1px solid var(--border); }
.inputs-used b { font-variant-numeric: tabular-nums; }

.warnings { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 6px; }
.warnings li { border-radius: 8px; padding: 8px 10px; font-size: 0.88rem; border-left: 4px solid; }
.warnings .danger { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); font-weight: 600; }
.warnings .warn { background: var(--warn-soft); color: var(--warn); border-color: var(--warn); }
.warnings .info { background: var(--info-soft); color: var(--info); border-color: var(--info); }
.warnings .wid { font-weight: 700; margin-right: 6px; }

/* ------------------------------------------------------------ table */

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.88rem; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { font-size: 0.78rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.03em; }
td.num, th.num { text-align: right; }
td.label-cell { white-space: normal; min-width: 150px; }
tr.selected td { background: var(--accent-soft); font-weight: 600; }
td.over { color: var(--danger); font-weight: 700; }

/* ------------------------------------------------------------ info */

.info summary { cursor: pointer; font-weight: 600; }
.info h3 { font-size: 0.95rem; margin: 18px 0 6px; }
.info ol, .info ul { padding-left: 20px; margin: 6px 0; }
.info li { margin: 3px 0; }
.info code { font-size: 0.85em; }
.info .src-list li { margin: 8px 0; }