:root {
  --bg: #ffffff;
  --bg-soft: #f4f6f8;
  --ink: #16202a;
  --ink-soft: #4a5868;
  --line: #dde3e9;
  --accent: #0f5e73;
  --accent-soft: #e3f0f3;
  --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f151b;
    --bg-soft: #161f27;
    --ink: #e8edf2;
    --ink-soft: #a3b0bd;
    --line: #26323d;
    --accent: #5fb7cc;
    --accent-soft: #15303a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", "Pretendard", "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  line-height: 1.65;
  font-size: 17px;
}
:lang(ko) body, body:lang(ko) { word-break: keep-all; overflow-wrap: anywhere; }
a { color: var(--accent); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav.main { display: flex; gap: 20px; font-size: 15px; }
nav.main a { color: var(--ink-soft); text-decoration: none; }
nav.main a:hover { color: var(--ink); }
nav.main a.lang { color: var(--accent); font-weight: 600; }
@media (max-width: 640px) { nav.main a:not(.lang) { display: none; } }

.hero { padding: 88px 0 72px; background: linear-gradient(180deg, var(--accent-soft), var(--bg)); }
.hero .eyebrow { font-size: 14px; font-weight: 600; color: var(--accent); letter-spacing: 0.04em; text-transform: uppercase; margin: 0 0 14px; }
.hero h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 20px; max-width: 18em; }
.hero p.lead { font-size: clamp(17px, 2vw, 20px); color: var(--ink-soft); max-width: 40em; margin: 0 0 32px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 8px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; }
@media (prefers-color-scheme: dark) { .btn { color: #0f151b; } }

section { padding: 72px 0; }
section.soft { background: var(--bg-soft); }
h2 { font-size: clamp(24px, 3.2vw, 32px); letter-spacing: -0.015em; margin: 0 0 12px; }
.section-lead { color: var(--ink-soft); max-width: 42em; margin: 0 0 40px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); gap: 24px; }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: 14px; padding: 28px; }
section.soft .card { background: var(--bg); }
.card .num { font-size: 13px; font-weight: 700; color: var(--accent); letter-spacing: 0.06em; }
.card h3 { font-size: 21px; margin: 6px 0 10px; letter-spacing: -0.01em; }
.card p { color: var(--ink-soft); margin: 0 0 14px; }
.card ul { margin: 0; padding-left: 18px; }
.card li { margin: 6px 0; }

.principles { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); gap: 20px; }
.principles div { border-top: 3px solid var(--accent); padding-top: 14px; }
.principles h3 { font-size: 17px; margin: 0 0 6px; }
.principles p { color: var(--ink-soft); margin: 0; font-size: 15px; }

.about { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
@media (max-width: 760px) { .about { grid-template-columns: 1fr; } }
dl.facts { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 10px 20px; font-size: 15px; }
dl.facts dt { color: var(--ink-soft); }
dl.facts dd { margin: 0; }

footer.site { border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: 14px; color: var(--ink-soft); }
footer.site p { margin: 4px 0; }