:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --surface: rgba(255, 255, 255, 0.82);
  --text: #171923;
  --muted: #626776;
  --line: rgba(22, 28, 45, 0.12);
  --accent: #635bff;
  --accent-soft: rgba(99, 91, 255, 0.1);
  --button-bg: #574ee3;
  --button-text: #fff;
  --shadow: 0 24px 70px rgba(40, 43, 70, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101116;
    --surface: rgba(28, 30, 38, 0.88);
    --text: #f3f4f8;
    --muted: #a8adba;
    --line: rgba(255, 255, 255, 0.11);
    --accent: #9b95ff;
    --accent-soft: rgba(155, 149, 255, 0.13);
    --button-bg: #aaa5ff;
    --button-text: #111218;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.25);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% -10%, var(--accent-soft), transparent 34rem),
    var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans KR", sans-serif;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 10;
  padding: 9px 13px;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.shell {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 30px 0;
}

.brand {
  color: var(--text);
  font-size: 18px;
  font-weight: 750;
  letter-spacing: -0.02em;
  text-decoration: none;
}

nav { display: flex; gap: 18px; }
nav a { color: var(--muted); font-size: 14px; text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); font-weight: 650; }

.hero { padding: 60px 0 34px; }
.eyebrow {
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

h1 {
  max-width: 720px;
  margin: 10px 0 16px;
  font-size: clamp(38px, 7vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.lede { max-width: 700px; margin: 0; color: var(--muted); font-size: 19px; }
.updated { margin-top: 20px; color: var(--muted); font-size: 14px; }

.card {
  margin: 24px 0 72px;
  padding: clamp(24px, 6vw, 58px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.language + .language {
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--line);
}

h2 { margin: 0 0 18px; font-size: 28px; letter-spacing: -0.035em; }
h3 { margin: 28px 0 8px; font-size: 18px; letter-spacing: -0.02em; }
p { margin: 8px 0 18px; }
ul { margin: 14px 0 24px; padding-left: 22px; }
li + li { margin-top: 14px; }
strong { font-weight: 720; }
code {
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--accent-soft);
  font: 0.88em ui-monospace, SFMono-Regular, Menlo, monospace;
  overflow-wrap: anywhere;
}

.notice {
  margin: 0 0 30px;
  padding: 18px 20px;
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  background: var(--accent-soft);
}

.contact {
  display: inline-flex;
  margin-top: 10px;
  padding: 11px 16px;
  border-radius: 10px;
  background: var(--button-bg);
  color: var(--button-text);
  font-weight: 700;
  text-decoration: none;
}

footer {
  padding: 0 0 52px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 560px) {
  header { align-items: flex-start; flex-direction: column; }
  .hero { padding-top: 30px; }
  .card { border-radius: 18px; }
}