:root {
  color-scheme: light;
  --ink: #14211c;
  --muted: #52615b;
  --line: #d6ded9;
  --paper: #fbfcf9;
  --panel: #ffffff;
  --green: #0b6b47;
  --green-soft: #e7f5ee;
  --red: #a12b2b;
  --red-soft: #fff0ef;
  --amber: #7b5700;
  --amber-soft: #fff6d8;
  --blue: #174f75;
  --shadow: 0 12px 32px rgb(20 33 28 / 8%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 5% 5%, rgb(11 107 71 / 8%), transparent 32rem),
    var(--paper);
  line-height: 1.55;
}

a { color: var(--blue); }
a:hover { text-decoration-thickness: 2px; }

code {
  padding: 0.1rem 0.3rem;
  border-radius: 0.25rem;
  background: #eef2ef;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.wrap {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 780px; margin-bottom: 0.7rem; font-size: clamp(2rem, 5vw, 4.5rem); line-height: 0.98; letter-spacing: -0.045em; }
h2 { margin-bottom: 0.8rem; font-size: clamp(1.35rem, 2vw, 1.8rem); line-height: 1.15; }
h3 { margin-bottom: 0.45rem; font-size: 1rem; }

.eyebrow {
  margin-bottom: 0.7rem;
  color: var(--green);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lede { max-width: 760px; margin-bottom: 0; color: var(--muted); font-size: 1.08rem; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 1rem;
  padding-block: 1rem 3rem;
}

.panel {
  padding: clamp(1.1rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--panel);
  box-shadow: var(--shadow);
}

label { display: block; margin: 1rem 0 0.4rem; font-weight: 750; }
select, textarea, button { font: inherit; }
select, textarea {
  width: 100%;
  border: 1px solid #9eaba4;
  border-radius: 0.55rem;
  background: white;
  color: var(--ink);
}
select { padding: 0.7rem; }
textarea { min-height: 17rem; padding: 0.8rem; resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.93rem; line-height: 1.5; }
select:focus, textarea:focus, button:focus-visible, .table-scroll:focus-visible { outline: 3px solid rgb(23 79 117 / 32%); outline-offset: 2px; }

.format-help { margin-top: 0.75rem; color: var(--muted); font-size: 0.9rem; }
.format-help p, .format-help ul { margin-bottom: 0.5rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.1rem; }

button {
  min-height: 2.8rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--green);
  border-radius: 0.55rem;
  background: var(--green);
  color: white;
  font-weight: 760;
  cursor: pointer;
}
button:hover { filter: brightness(0.93); }
button.secondary { background: white; color: var(--green); }
button.quiet { border-color: transparent; background: transparent; color: var(--muted); }

.result { align-self: start; border-top: 0.35rem solid var(--amber); }
.result[data-status="INVALID"] { border-top-color: var(--red); }
.result[data-status="VALID_SO_FAR"], .result[data-status="VALID_COMPLETE"] { border-top-color: var(--green); }
.result:focus { outline: none; }
.result-facts { display: grid; grid-template-columns: minmax(9rem, auto) 1fr; gap: 0.45rem 0.8rem; margin: 1.2rem 0 0; }
.result-facts dt { color: var(--muted); font-weight: 680; }
.result-facts dd { margin: 0; overflow-wrap: anywhere; }

.error-card, .unknown-note, .callout { margin: 1rem 0 0; padding: 0.9rem; border-radius: 0.65rem; }
.error-card { border: 1px solid #e5a5a1; background: var(--red-soft); }
.error-card p:last-child { margin-bottom: 0; }
.unknown-note { background: var(--amber-soft); color: var(--amber); }
.callout { border-left: 0.3rem solid var(--green); background: var(--green-soft); }
.fine { color: var(--muted); font-size: 0.88rem; }

.trace-panel, .limits, .sources { grid-column: 1 / -1; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.section-heading > p { max-width: 28rem; color: var(--muted); font-size: 0.9rem; }
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 0.65rem; }
table { width: 100%; min-width: 940px; border-collapse: collapse; font-size: 0.88rem; }
th, td { padding: 0.7rem; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { background: #f1f5f2; font-size: 0.75rem; letter-spacing: 0.02em; text-transform: uppercase; }
tbody tr:last-child td { border-bottom: 0; }
.invalid-row { background: var(--red-soft); }
.columns { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.columns ul, .sources ul { padding-left: 1.2rem; }
.footer { padding-bottom: 2.5rem; color: var(--muted); font-size: 0.88rem; }

@media (max-width: 780px) {
  .site-header { padding-top: 2.25rem; }
  .layout { grid-template-columns: 1fr; }
  .trace-panel, .limits, .sources { grid-column: 1; }
  .columns { grid-template-columns: 1fr; gap: 1rem; }
  .section-heading { display: block; }
  .result-facts { grid-template-columns: 1fr; gap: 0.1rem; }
  .result-facts dd { margin-bottom: 0.65rem; }
  .actions button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}