:root {
  --bg: #f6f7f8; --panel: #fff; --ink: #1c2227; --muted: #5f6a72; --line: #dde2e5;
  --accent: #1f4d6b; --ok-bg: #e3f2e6; --ok-ink: #1f5a2c; --bad-bg: #fbe3e3; --bad-ink: #8a1f1f;
  --note-bg: #eef3f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181b; --panel: #1c2226; --ink: #e6eaed; --muted: #9aa5ad; --line: #2e363c;
    --accent: #8fc1e0; --ok-bg: #1b3322; --ok-ink: #a6dcb2; --bad-bg: #3d1d1d; --bad-ink: #f3b0b0;
    --note-bg: #1f2a31;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
header { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; justify-content: space-between;
  padding: 14px 20px; background: var(--panel); border-bottom: 1px solid var(--line); }
header nav { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
a { color: var(--accent); }
.brand { font-weight: 700; text-decoration: none; color: var(--ink); }
main { max-width: 960px; margin: 0 auto; padding: 20px 16px 48px; }
footer { text-align: center; padding: 12px; font-size: 13px; }
h1 { font-size: 22px; } h2 { font-size: 17px; margin-top: 24px; }
.muted, .help { color: var(--muted); } .help { font-size: 13px; margin: 2px 0 8px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.card { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px;
  color: inherit; text-decoration: none; }
.card h2 { margin-top: 0; } .narrow { max-width: 420px; }
.price { font-size: 20px; font-weight: 700; }
label { display: block; font-size: 14px; color: var(--muted); margin: 10px 0 4px; }
label.check { color: var(--ink); }
input[type=text], input[type=email], textarea, select { width: 100%; padding: 8px 10px; border: 1px solid var(--line);
  border-radius: 6px; background: var(--bg); color: var(--ink); font: inherit; }
textarea { min-height: 120px; }
button { margin-top: 12px; background: var(--accent); color: var(--panel); border: 0; padding: 8px 18px;
  border-radius: 6px; font: inherit; font-weight: 600; cursor: pointer; }
button.link { background: none; color: var(--accent); padding: 0; margin: 0; font-weight: 400; }
form.inline { display: inline; }
.note { background: var(--note-bg); padding: 10px 12px; border-radius: 6px; margin: 12px 0; }
.note.bad { background: var(--bad-bg); color: var(--bad-ink); } .note.ok { background: var(--ok-bg); color: var(--ok-ink); }
table { width: 100%; border-collapse: collapse; font-size: 14px; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }
.result { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px; overflow-x: auto; }
pre { white-space: pre-wrap; }