:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1b1f2a;
  --muted: #6b7280;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --border: #e5e7eb;
  --good: #059669;
  --warn: #dc2626;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .05);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --card: #181b24;
    --text: #e7e9ee;
    --muted: #9aa1ad;
    --accent: #818cf8;
    --accent-soft: #232647;
    --border: #2a2e3a;
    --shadow: 0 1px 3px rgba(0, 0, 0, .4);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
header.site {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 20;
}
header.site .wrap {
  display: flex; align-items: center; gap: 16px;
  height: 56px;
}
.logo { font-weight: 800; font-size: 20px; color: var(--text); letter-spacing: -.5px; }
.logo em { color: var(--accent); font-style: normal; }
/* 모바일에서 메뉴가 잘리는데 스크롤바를 숨겨둬서 더 있다는 힌트가 없다.
   오른쪽 끝을 흐리게 처리해 "옆으로 더 있음"을 시각적으로 알린다. */
.nav-wrap { margin-left: auto; position: relative; min-width: 0; }
.nav-wrap::after {
  content: ""; position: absolute; right: 0; top: 0; bottom: 0; width: 28px;
  background: linear-gradient(to right, transparent, var(--card));
  pointer-events: none;
}
nav.top { display: flex; gap: 14px; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
nav.top::-webkit-scrollbar { display: none; }
nav.top a { color: var(--muted); font-size: 14px; }
nav.top a:hover, nav.top a.on { color: var(--accent); }

main { padding: 28px 0 48px; }
h1 { font-size: 26px; letter-spacing: -.5px; margin: 0 0 6px; }
.sub { color: var(--muted); margin: 0 0 22px; font-size: 15px; }
h2 { font-size: 20px; margin: 36px 0 12px; letter-spacing: -.3px; }
h3 { font-size: 16px; margin: 20px 0 8px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 20px;
}

/* Forms */
label.f { display: block; font-size: 13.5px; font-weight: 600; color: var(--muted); margin: 14px 0 5px; }
label.f:first-child { margin-top: 0; }
input[type=text], input[type=number], input[type=date], select, textarea {
  width: 100%;
  padding: 11px 13px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 16px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > div { flex: 1 1 180px; }
.seg { display: inline-flex; border: 1.5px solid var(--border); border-radius: 10px; overflow: hidden; flex-wrap: wrap; }
.seg button {
  border: 0; background: var(--card); color: var(--muted);
  padding: 9px 16px; font-size: 14px; font-weight: 600; cursor: pointer; font-family: inherit;
}
.seg button.on { background: var(--accent); color: #fff; }
button.go {
  margin-top: 18px; width: 100%;
  background: var(--accent); color: #fff; border: 0;
  padding: 13px; border-radius: 10px;
  font-size: 16px; font-weight: 700; cursor: pointer; font-family: inherit;
}
button.go:hover { filter: brightness(1.08); }
button.ghost {
  background: var(--accent-soft); color: var(--accent); border: 0;
  padding: 9px 14px; border-radius: 9px; font-size: 14px; font-weight: 600; cursor: pointer; font-family: inherit;
}
button.copy-result { margin-top: 16px; width: 100%; padding: 11px; }

/* Results */
.result { display: none; }
.result.show { display: block; }
.big {
  font-size: 30px; font-weight: 800; color: var(--accent); letter-spacing: -1px;
  margin: 4px 0 2px; word-break: keep-all;
}
.big small { font-size: 16px; color: var(--muted); font-weight: 600; }
table.rt { width: 100%; border-collapse: collapse; font-size: 14.5px; margin-top: 12px; }
table.rt th, table.rt td { padding: 9px 8px; border-bottom: 1px solid var(--border); text-align: right; }
table.rt th { color: var(--muted); font-weight: 600; text-align: left; }
table.rt tr.total td { font-weight: 800; color: var(--accent); border-top: 2px solid var(--border); }
.scroll { overflow-x: auto; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin-top: 8px; }
.stat { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.stat b { display: block; font-size: 21px; letter-spacing: -.5px; }
.stat span { font-size: 12.5px; color: var(--muted); }

/* Tool cards on home */
.tools { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.tool-card {
  display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; color: var(--text);
  box-shadow: var(--shadow); transition: transform .12s ease, border-color .12s ease;
}
.tool-card:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }
.tool-card .ico { font-size: 26px; }
.tool-card b { display: block; margin: 8px 0 3px; font-size: 16.5px; }
.tool-card span { font-size: 13.5px; color: var(--muted); }

/* SEO content */
.seo { font-size: 15px; color: var(--text); }
.seo p, .seo li { color: var(--muted); }
.seo strong { color: var(--text); }
details.faq {
  border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 16px; margin-bottom: 10px; background: var(--card);
}
details.faq summary { font-weight: 700; cursor: pointer; font-size: 15px; }
details.faq p { margin: 10px 0 2px; font-size: 14.5px; color: var(--muted); }

.disclaimer { font-size: 12.5px; color: var(--muted); margin-top: 14px; }

/* Ads */
.ad-slot { margin: 22px 0; text-align: center; min-height: 0; }
.ad-slot ins { display: block; }
.coupang-slot { margin: 22px 0; text-align: center; }

.related { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.related a {
  background: var(--accent-soft); color: var(--accent);
  padding: 7px 13px; border-radius: 999px; font-size: 13.5px; font-weight: 600;
}
.related a:hover { text-decoration: none; filter: brightness(.97); }

footer.site {
  border-top: 1px solid var(--border);
  padding: 26px 0 40px; color: var(--muted); font-size: 13px;
  background: var(--card);
}
footer.site a { color: var(--muted); margin-right: 14px; }

@media (max-width: 560px) {
  h1 { font-size: 22px; }
  .big { font-size: 25px; }
  .card { padding: 17px; }
}