:root {
  --bg: #ffffff;
  --ink: #222222;
  --muted: #6b6b6b;
  --line: #e6e6e6;
  --accent: #c8693a;
  --link: #a9501f;
  --cube-t: #f3d9b8;
  --cube-l: #d9a979;
  --cube-r: #bd8556;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; color-scheme: light; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
a { color: var(--link); }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; width: 100%; }

/* language */
html:not([data-lang]) .ko { display: none; }
html[data-lang="ko"] .en { display: none; }
html[data-lang="en"] .ko { display: none; }

/* header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: .01em; }
.header-right { display: flex; align-items: center; gap: 16px; }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 2px; background: var(--bg); }
.lang button {
  font: inherit; font-size: .85rem; font-weight: 600; border: 0; background: transparent; color: var(--muted);
  padding: 4px 12px; border-radius: 999px; cursor: pointer; line-height: 1.4;
}
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.lang button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* document pages */
.doc { padding: 40px 0 56px; }
.doc .wrap { max-width: 720px; }
.doc h1 { font-size: 1.9rem; margin: 0 0 6px; letter-spacing: -.01em; }
.doc h2 { font-size: 1.15rem; margin: 30px 0 6px; }
.doc p, .doc li { margin: 6px 0; }
.doc .meta { color: var(--muted); font-size: .9rem; margin: 0 0 8px; }

/* footer */
.site-footer { margin-top: auto; border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: .9rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.site-footer a { color: var(--muted); }