:root {
  --bg: #f7f8fa;
  --card: #fff;
  --text: #1c2430;
  --muted: #5b6573;
  --brand: #c2410c;
  --brand-dark: #9a3412;
  --ok: #166534;
  --ok-bg: #ecfdf3;
  --warn-bg: #fff7e6;
  --warn: #8a4b00;
  --err: #b42318;
  --line: #dde2e8;
  --radius: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
a { color: var(--brand-dark); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid #f59e0b; outline-offset: 2px; }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; background: #fff; padding: 8px; z-index: 10; }

.site-header { background: #fff; border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; padding-top: 10px; padding-bottom: 10px; }
.logo { font-weight: 800; font-size: 1.3rem; text-decoration: none; color: var(--text); }
.logo span { color: var(--brand); }
.nav { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: .95rem; }
.nav a { text-decoration: none; padding: 6px 0; }
.nav a:hover { text-decoration: underline; }

main { padding: 20px 0 40px; }
h1 { font-size: 1.6rem; line-height: 1.3; margin: .2em 0 .5em; }
h2 { font-size: 1.25rem; margin-top: 1.8em; }
h3 { font-size: 1.05rem; margin: 0 0 .5em; }
.lead { font-size: 1.05rem; color: var(--muted); }
.muted { color: var(--muted); }

.grid { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 700px) { .grid-2 { grid-template-columns: 1fr 1fr; } .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.card h2, .card h3 { margin-top: 0; }
.card .btn { margin-top: 6px; }

.btn {
  display: inline-block; min-height: 44px; padding: 10px 18px; border-radius: 10px; border: 0;
  background: var(--brand); color: #fff; font-size: 1rem; font-weight: 600; text-decoration: none; cursor: pointer;
}
.btn:hover { background: var(--brand-dark); }
.btn.secondary { background: #fff; color: var(--brand-dark); border: 1px solid var(--brand); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }

fieldset { border: 1px solid var(--line); border-radius: var(--radius); background: #fff; padding: 12px 14px 14px; margin: 0; min-width: 0; }
legend { font-weight: 700; padding: 0 6px; }
.field { margin-top: 10px; }
.field label { display: block; font-weight: 600; font-size: .95rem; }
.field .hint { display: block; font-size: .85rem; color: var(--muted); font-weight: 400; }
input, select {
  width: 100%; min-height: 44px; font-size: 16px; padding: 8px 10px; border: 1px solid #b8c0cb; border-radius: 8px; background: #fff; color: var(--text);
}
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.result { margin-top: 18px; display: grid; gap: 12px; }
.result:focus { outline: none; }
.result-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
.result-card.best { border: 2px solid var(--ok); background: var(--ok-bg); }
.kv { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-weight: 700; text-align: right; }
.errors { color: var(--err); margin: 0; padding-left: 1.2em; }
.warn { background: var(--warn-bg); color: var(--warn); padding: 10px 12px; border-radius: 8px; }
.note { background: #fff; border-left: 4px solid var(--brand); padding: 10px 14px; border-radius: 0 8px 8px 0; }

table { border-collapse: collapse; width: 100%; background: #fff; font-size: .95rem; }
th, td { border: 1px solid var(--line); padding: 8px; text-align: left; vertical-align: top; }
.table-wrap { overflow-x: auto; }
code { background: #eef1f4; padding: 1px 5px; border-radius: 4px; font-size: .92em; }

.breadcrumb { font-size: .9rem; color: var(--muted); margin-bottom: 4px; }
.site-footer { border-top: 1px solid var(--line); background: #fff; padding: 20px 0; font-size: .92rem; color: var(--muted); }
.site-footer ul { list-style: none; padding: 0; margin: 8px 0; display: flex; flex-wrap: wrap; gap: 6px 16px; }