:root {
  --bg: #f6f7f9; --card: #fff; --text: #1d2330; --muted: #6b7280;
  --line: #e3e6eb; --accent: #2f6fed; --accent-weak: #eaf1ff; --ok: #1a9e5c; --minus: #d9534f;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c; --card: #1d2128; --text: #e7e9ee; --muted: #9aa3b2;
    --line: #2e343e; --accent: #6b9bff; --accent-weak: #22304d; --ok: #3ccf8a; --minus: #ff7b7b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", sans-serif;
  padding: 0 16px 64px;
}
a { color: var(--accent); }
header.top {
  max-width: 720px; margin: 0 auto 24px; padding: 14px 0;
  display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; border-bottom: 1px solid var(--line);
}
header.top .logo { font-weight: 700; color: var(--text); text-decoration: none; margin-right: auto; }
header.top nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
header.top nav a { color: var(--muted); text-decoration: none; }
header.top nav a.on { color: var(--accent); font-weight: 600; }
main { max-width: 720px; margin: 0 auto; }
h1 { font-size: 26px; margin: 0 0 4px; }
.sub { color: var(--muted); margin: 0 0 24px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px; margin-bottom: 16px;
}
label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 6px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.field { min-width: 0; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; min-height: 18px; }
input, select {
  width: 100%; padding: 11px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 9px; outline: none;
}
input:focus, select:focus { border-color: var(--accent); }
.unit { position: relative; }
.unit input { padding-right: 44px; text-align: right; }
.unit span { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 14px; pointer-events: none; }
.check { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--text); font-weight: 500; margin: 0; cursor: pointer; }
.check input { width: auto; }
button {
  font: inherit; font-weight: 600; border: 0; border-radius: 9px; cursor: pointer;
  padding: 11px 16px; background: var(--accent); color: #fff; white-space: nowrap;
}
button.main { width: 100%; margin-top: 18px; padding: 13px; font-size: 16px; }
button.ghost { background: var(--accent-weak); color: var(--accent); padding: 6px 10px; font-size: 13px; }
button.ghost.done { color: var(--ok); }
.seg { display: flex; gap: 4px; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 4px; }
.seg button { flex: 1; background: transparent; color: var(--muted); padding: 8px 6px; font-size: 14px; white-space: normal; }
.seg button.on { background: var(--card); color: var(--accent); box-shadow: 0 1px 3px rgba(0,0,0,.12); }
#msg, .msg { color: var(--minus); font-size: 14px; margin: 10px 0 0; }
.msg:empty { display: none; }

.result { display: none; }
.result h2 { font-size: 16px; margin: 0 0 12px; display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.big {
  background: var(--accent-weak); border-radius: 12px; padding: 18px; text-align: center; margin-bottom: 12px;
}
.big .k { color: var(--muted); font-size: 13px; }
.big .v { font-size: 30px; font-weight: 800; color: var(--accent); letter-spacing: -0.5px; }
.big .s { color: var(--muted); font-size: 13px; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: 9px 6px; border-top: 1px solid var(--line); text-align: right; }
th { font-size: 13px; color: var(--muted); font-weight: 600; background: var(--bg); }
td:first-child, th:first-child { text-align: left; }
td.k { color: var(--muted); font-size: 14px; }
tr.sum td { font-weight: 700; }
td.minus { color: var(--minus); }
.scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.scroll table { min-width: 460px; font-size: 14px; }
details summary { cursor: pointer; color: var(--accent); font-weight: 600; margin: 12px 0 8px; }
.note { color: var(--muted); font-size: 13px; margin: 10px 0 0; }

.guide h2 { font-size: 19px; margin: 0 0 10px; }
.guide h3 { font-size: 16px; margin: 22px 0 6px; }
.guide p, .guide li { margin: 0 0 8px; }
.guide ul, .guide ol { padding-left: 20px; margin: 0 0 8px; }
.guide table { margin: 8px 0 12px; font-size: 14px; }
.faq dt { font-weight: 700; margin-top: 14px; }
.faq dd { margin: 4px 0 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-bottom: 16px; }
.cards a {
  display: block; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px;
  color: var(--text); text-decoration: none;
}
.cards a:hover { border-color: var(--accent); }
.cards b { display: block; font-size: 17px; margin-bottom: 4px; }
.cards span { color: var(--muted); font-size: 14px; }
.related { display: flex; flex-wrap: wrap; gap: 8px; }
.related a { background: var(--accent-weak); padding: 8px 12px; border-radius: 9px; text-decoration: none; font-size: 14px; font-weight: 600; }

.ad { margin: 0 0 16px; min-height: 100px; overflow: hidden; }
.ad:has(ins[data-ad-status="unfilled"]) { display: none; }

footer { max-width: 720px; margin: 24px auto 0; text-align: center; color: var(--muted); font-size: 13px; }
footer a { color: var(--muted); }
.doc { line-height: 1.75; }
.doc h2 { font-size: 17px; margin-top: 28px; }