:root {
  --bg: #f7f6f2; --surface: #ffffff; --ink: #1d2124; --muted: #5b6268; --line: #dcd9d0; --field-line: #858a8e;
  --accent: #1f6f5c; --accent-ink: #ffffff;
  --warn-bg: #fff4dc; --warn-ink: #6b4a00; --bad: #a3271c;
  --radius: 12px; --gap: 16px;
  --fs-s: 0.8125rem; --fs-m: 0.875rem; --fs-l: 0.9375rem;
  font-family: system-ui, -apple-system, "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15181a; --surface: #1e2225; --ink: #e8e6e1; --muted: #a3a9ad; --line: #353a3e; --field-line: #747b80;
    --accent: #5cc0a3; --accent-ink: #0d1f1a;
    --warn-bg: #3a2f14; --warn-ink: #f3d68f; --bad: #ff8a7d;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #15181a; --surface: #1e2225; --ink: #e8e6e1; --muted: #a3a9ad; --line: #353a3e; --field-line: #747b80;
  --accent: #5cc0a3; --accent-ink: #0d1f1a;
  --warn-bg: #3a2f14; --warn-ink: #f3d68f; --bad: #ff8a7d;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.7; font-size: 16px; word-break: keep-all; overflow-wrap: anywhere; }
a { color: var(--accent); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.top { background: var(--surface); border-bottom: 1px solid var(--line); }
.top .in { max-width: 860px; margin: 0 auto; padding: 12px 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; }
.brand { font-weight: 700; font-size: 1.125rem; color: var(--ink); text-decoration: none; }
.brand span { color: var(--accent); }
.top nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: var(--fs-l); }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover, .top nav a[aria-current="page"] { color: var(--ink); }
.top nav a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 6px; }

.wrap { max-width: 860px; margin: 0 auto; padding: 24px 16px 48px; }
.crumb { font-size: var(--fs-m); color: var(--muted); margin-bottom: 8px; }
.crumb a { color: var(--muted); }
h1 { font-size: 1.625rem; line-height: 1.35; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 40px 0 12px; }
h3 { font-size: 1.0625rem; margin: 24px 0 8px; }
.lead { color: var(--muted); margin: 0 0 16px; }
.meta { font-size: var(--fs-m); color: var(--muted); }

.notice { background: var(--warn-bg); color: var(--warn-ink); border-radius: var(--radius); padding: 12px 16px; font-size: var(--fs-l); margin: 16px 0; }
.notice strong { font-weight: 700; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin: 16px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--gap); }
.grid.calcs { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 560px) { .grid.calcs { grid-template-columns: 1fr; } }
.grid .card { margin: 0; display: flex; flex-direction: column; }
.grid .card h3, .promo h3 { margin-top: 0; }
.grid .card p, .promo p { color: var(--muted); font-size: var(--fs-l); margin: 0; flex: 1; }
.card h3 a, .list a { color: var(--ink); text-decoration: none; }
.card h3 a:hover, .list a:hover { text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 4px; }
.tag { display: block; font-size: var(--fs-s); color: var(--muted); margin-bottom: 4px; }

.list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.list li { display: grid; grid-template-columns: 1fr auto; gap: 4px 16px; align-items: baseline; padding: 16px 0; border-bottom: 1px solid var(--line); max-width: none; }
.list a { font-weight: 700; font-size: 1.0625rem; }
.list .tag { margin: 0; white-space: nowrap; }
.list p { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: var(--fs-l); max-width: 70ch; }

form .row { display: grid; gap: 8px; margin-bottom: 16px; }
form label, form legend { font-weight: 600; font-size: var(--fs-l); }
form .hint { font-size: var(--fs-s); color: var(--muted); font-weight: 400; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
fieldset.group { border-top: 1px solid var(--line); padding-top: 12px; margin-top: 4px; }
input[type="text"], input[type="number"], input[type="date"], select {
  width: 100%; font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--field-line);
  border-radius: 8px; padding: 10px 12px; min-height: 44px;
}
.choices { display: flex; flex-wrap: wrap; gap: 8px; }
.choices label { font-weight: 400; display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--field-line); border-radius: 8px; padding: 8px 12px; background: var(--bg); cursor: pointer; min-height: 44px; }
.choices input { accent-color: var(--accent); width: 18px; height: 18px; margin: 0; }
.check { display: flex; align-items: flex-start; gap: 8px; font-weight: 400 !important; }
.check input { accent-color: var(--accent); width: 20px; height: 20px; margin: 4px 0 0; flex: none; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .two { grid-template-columns: 1fr; } }
button { font: inherit; font-weight: 700; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 8px; padding: 12px 20px; cursor: pointer; min-height: 44px; }
button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
a.btn { display: inline-block; font-weight: 700; background: var(--accent); color: var(--accent-ink); border-radius: 8px; padding: 12px 20px; min-height: 44px; text-decoration: none; }

.out { margin-top: 16px; }
.out .big { font-size: 2rem; line-height: 1.2; font-weight: 700; font-variant-numeric: tabular-nums; margin: 4px 0 8px; color: var(--accent); }
.out .why { color: var(--muted); font-size: var(--fs-l); margin: 0; }
.out .err { color: var(--bad); font-weight: 600; }
.out .warn { color: var(--warn-ink); background: var(--warn-bg); border-radius: 8px; padding: 8px 12px; font-size: var(--fs-l); margin-top: 8px; }
table { width: 100%; border-collapse: collapse; font-size: var(--fs-l); margin: 12px 0; }
th, td { border-bottom: 1px solid var(--line); padding: 8px; text-align: left; vertical-align: top; overflow-wrap: break-word; }
th { font-weight: 600; color: var(--muted); }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; }
td.n { white-space: nowrap; }
.table-scroll { overflow-x: auto; }

/* 광고를 붙이기 전까지는 빈 상자를 보이지 않는다 */
.ad-slot { display: none; }

.sources { font-size: var(--fs-l); }
.sources ul { padding-left: 1.2em; }
.sources li { margin-bottom: 4px; }
article p, article li { max-width: 70ch; }
article ul, article ol { padding-left: 1.3em; }
blockquote { margin: 12px 0; padding: 4px 16px; border-left: 2px solid var(--accent); }

footer { border-top: 1px solid var(--line); background: var(--surface); }
footer .in { max-width: 860px; margin: 0 auto; padding: 20px 16px 32px; font-size: var(--fs-m); color: var(--muted); }
footer a { color: var(--muted); }
footer nav { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-bottom: 8px; }
[hidden] { display: none !important; }