:root {
  --bg: #f6f8fa;
  --card: #ffffff;
  --ink: #17202b;
  --muted: #5b6573;
  --line: #e3e8ee;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #e7f5f3;
  --good: #15803d;
  --warn: #b45309;
  --bad: #b91c1c;
  --code: #eef2f6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --card: #171d24;
    --ink: #e6ebf0;
    --muted: #9aa5b1;
    --line: #2a333d;
    --accent: #2dd4bf;
    --accent-ink: #062925;
    --accent-soft: #12302d;
    --good: #4ade80;
    --warn: #fbbf24;
    --bad: #f87171;
    --code: #1f2730;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }

.top { border-bottom: 1px solid var(--line); background: var(--card); }
.top .wrap { display: flex; align-items: center; gap: 18px; height: 56px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--ink); text-decoration: none; }
.brand img { width: 26px; height: 26px; border-radius: 6px; }
.top nav { display: flex; gap: 16px; margin-left: auto; font-size: 15px; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a[aria-current] { color: var(--ink); font-weight: 600; }

header.hero { padding: 36px 0 8px; }
h1 { font-size: clamp(28px, 5vw, 40px); line-height: 1.15; margin: 0 0 10px; letter-spacing: -0.01em; }
.lede { color: var(--muted); font-size: 18px; margin: 0; max-width: 680px; }
h2 { font-size: 24px; line-height: 1.25; margin: 44px 0 12px; }
h3 { font-size: 18px; margin: 26px 0 8px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; margin: 22px 0; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.tabs button {
  font: inherit; font-size: 15px; padding: 7px 14px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: transparent; color: var(--ink);
}
.tabs button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: var(--muted); }
input, select {
  font: inherit; font-size: 16px; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 9px; padding: 8px 10px; width: 100%;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
[hidden] { display: none !important; }

.result { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 16px; }
.big { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.big b { font-size: 40px; line-height: 1; color: var(--accent); font-variant-numeric: tabular-nums; }
.big span { color: var(--muted); }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; margin: 14px 0 0; }
.facts div { background: var(--bg); border-radius: 10px; padding: 10px 12px; }
.facts small { display: block; color: var(--muted); font-size: 13px; }
.facts strong { font-size: 18px; font-variant-numeric: tabular-nums; }
.note { margin: 12px 0 0; padding: 10px 12px; border-radius: 10px; font-size: 14.5px; background: var(--accent-soft); }
.note.warn { background: color-mix(in srgb, var(--warn) 14%, transparent); }

.tablewrap { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 14px; }
tr.hl td { background: var(--accent-soft); font-weight: 600; }

.cta {
  display: grid; grid-template-columns: 1fr; gap: 18px; align-items: center;
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; margin: 36px 0;
}
@media (min-width: 760px) { .cta { grid-template-columns: 1.1fr 1fr; } }
.cta h2 { margin: 0 0 8px; font-size: 22px; }
.cta p { margin: 0 0 14px; color: var(--muted); }
.cta img { width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); display: block; }
.btns { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 16px; border-radius: 10px; font-weight: 600; text-decoration: none;
  border: 1px solid var(--accent); color: var(--accent);
}
.btn.primary { background: var(--accent); color: var(--accent-ink); }

details { border-bottom: 1px solid var(--line); padding: 12px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 0; color: var(--muted); }

code { background: var(--code); padding: 1px 5px; border-radius: 5px; font-size: 0.92em; }
footer.site { margin-top: 56px; padding: 22px 0 36px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer.site p { margin: 4px 0; }