/* Alteria-Red 공통 스타일 — 헤더 메뉴 · 푸터 · 문서 본문
   기본 테마: 루비(밝은 바탕).  body.theme-alpha: AlphaSecret 다크 + 골드. */
:root{
  --paper:#FBF7F7;
  --mist:#F4ECEE;
  --ink:#3A0A12;
  --ink-soft:#6E4A51;
  --ruby:#A4152F;
  --ruby-deep:#6B0D1E;
  --ruby-bright:#D12A4C;
  --line:#E6D3D7;
  --card:#FFFFFF;
  --pad: clamp(20px, 5vw, 72px);
  --font: "Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",system-ui,sans-serif;
}
body.theme-alpha{
  --paper:#0F1115;
  --mist:#171A21;
  --ink:#E7EAF0;
  --ink-soft:#8B93A7;
  --ruby:#D9B25E;        /* 이 테마에서 강조색은 골드 */
  --ruby-deep:#B8913F;
  --ruby-bright:#FBEBB8;
  --line:#252A34;
  --card:#171A21;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{margin:0}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  word-break:keep-all;
  overflow-wrap:anywhere;
  overflow-x:hidden;
  min-height:100svh;
  display:flex;
  flex-direction:column;
}
a{color:var(--ruby)}
a:focus-visible,button:focus-visible{outline:2px solid var(--ruby-bright);outline-offset:3px;border-radius:6px}

/* ---------- 헤더 ---------- */
.site-header{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:calc(14px + env(safe-area-inset-top,0px)) var(--pad) 14px;
  background:color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter:saturate(1.4) blur(14px);
  -webkit-backdrop-filter:saturate(1.4) blur(14px);
  border-bottom:1px solid color-mix(in srgb, var(--line) 70%, transparent);
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:760;letter-spacing:-.02em;white-space:nowrap}
.brand img{width:34px;height:auto;display:block}
.brand b{color:var(--ruby);font-weight:760}
body.theme-alpha .brand b{color:#E35D74} /* 다크 페이지에서도 Alteria-Red 는 루비 */
.nav{display:flex;align-items:center;gap:clamp(12px,2.4vw,28px);font-size:.9375rem}
.nav a{color:var(--ink-soft);text-decoration:none;font-weight:560;letter-spacing:-.01em;padding:6px 0;position:relative;white-space:nowrap}
.nav a:hover{color:var(--ink)}
.nav a[aria-current="page"]{color:var(--ink)}
.nav a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;background:var(--ruby)}
.nav .ext::after{content:" ↗";font-size:.8em;opacity:.7}

@media (max-width: 560px){
  .site-header{flex-wrap:wrap;row-gap:8px}
  .brand span{font-size:.95rem}
  .nav{width:100%;justify-content:flex-start;font-size:.875rem;gap:18px}
}

/* ---------- 푸터 ---------- */
.site-footer{
  margin-top:auto;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;
  padding:20px var(--pad) calc(24px + env(safe-area-inset-bottom,0px));
  border-top:1px solid var(--line);
  font-size:.8125rem;color:var(--ink-soft);
}
.site-footer p{margin:0}
.site-footer a{color:inherit;text-decoration:underline;text-underline-offset:3px}
.site-footer b{color:var(--ruby);font-weight:650}

/* ---------- 문서(개인정보처리방침 등) ---------- */
.doc{width:100%;max-width:52rem;margin:0 auto;padding:clamp(28px,6vh,64px) var(--pad) 64px}
.doc .eyebrow{font-size:.8125rem;font-weight:650;letter-spacing:.14em;color:var(--ruby);text-transform:uppercase;margin:0 0 10px}
.doc h1{font-size:clamp(1.75rem,1.2rem + 2.2vw,2.6rem);line-height:1.2;letter-spacing:-.035em;margin:0 0 12px;font-weight:740}
.doc .meta{color:var(--ink-soft);font-size:.9375rem;margin:0 0 28px}
.doc h2{font-size:1.1875rem;letter-spacing:-.02em;margin:44px 0 12px;padding-top:4px;font-weight:720;scroll-margin-top:90px}
.doc h3{font-size:1rem;margin:24px 0 8px;font-weight:680}
.doc p,.doc li{line-height:1.8;font-size:.98rem;color:color-mix(in srgb, var(--ink) 88%, var(--ink-soft))}
.doc ul,.doc ol{padding-left:1.3em}
.doc li+li{margin-top:4px}
.doc .toc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin:8px 0 8px}
.doc .toc ol{margin:0;columns:2;column-gap:28px}
@media (max-width:640px){.doc .toc ol{columns:1}}
.doc .toc a{color:var(--ink);text-decoration:none}
.doc .toc a:hover{color:var(--ruby);text-decoration:underline}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:12px;margin:12px 0;background:var(--card)}
.doc table{width:100%;border-collapse:collapse;font-size:.9rem;min-width:560px}
.doc th,.doc td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line);line-height:1.6}
.doc th{background:var(--mist);font-weight:680;white-space:nowrap}
.doc tr:last-child td{border-bottom:0}
.note{background:color-mix(in srgb, var(--ruby) 7%, var(--card));border:1px solid color-mix(in srgb, var(--ruby) 22%, var(--line));border-radius:12px;padding:14px 18px;margin:16px 0}
.note p{margin:0}

@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
}