/* EN5425 course site — HydroAI warm-ivory tokens, minimal build.
   Same palette family as hydroai-dashboard; keep it quiet: type + hairlines, no heroes. */
:root {
  color-scheme: light;
  --page:#f0eee6; --surface:#faf9f5; --ink:#141413; --ink-2:#57554c;
  --muted:#8a877d; --hairline:#e2ded1; --accent:#ae562f; --accent-ink:#fff;
  --wash:rgba(20,20,19,.05); --ok:#3f7048; --warn:#a5771e;
  --serif:"Iowan Old Style",Palatino,"Palatino Linotype",Georgia,"Apple SD Gothic Neo","Malgun Gothic",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page:#1b1a17; --surface:#262521; --ink:#f0eee6; --ink-2:#b7b3a6;
    --muted:#8c887c; --hairline:#3a3831; --accent:#d97757; --accent-ink:#1b1a17;
    --wash:rgba(240,238,230,.06); --ok:#7fae87; --warn:#cfa14a;
  }
}
:root[data-theme="dark"] {
    color-scheme: dark;
    --page:#1b1a17; --surface:#262521; --ink:#f0eee6; --ink-2:#b7b3a6;
    --muted:#8c887c; --hairline:#3a3831; --accent:#d97757; --accent-ink:#1b1a17;
    --wash:rgba(240,238,230,.06); --ok:#7fae87; --warn:#cfa14a;
}
* { box-sizing:border-box; }
[hidden] { display:none !important; }
html { scroll-behavior:smooth; }
body { margin:0; background:var(--page); color:var(--ink); font-family:var(--sans);
  font-size:15px; line-height:1.65; -webkit-font-smoothing:antialiased; }
.wrap { max-width:1280px; margin:0 auto; padding:0 24px 90px; }
a { color:var(--accent); text-decoration:none; }
a:hover { text-decoration:underline; }
:focus-visible { outline:2px solid var(--accent); outline-offset:2px; border-radius:4px; }

/* ---- site nav ---- */
.site-nav { border-bottom:1px solid var(--hairline); background:var(--page);
  position:sticky; top:0; z-index:20; }
.site-nav .in { max-width:1280px; margin:0 auto; padding:10px 24px 8px;
  display:flex; flex-direction:column; gap:5px; }
.site-nav .row { display:flex; align-items:center; gap:6px 18px; flex-wrap:wrap; }
.site-nav .menu { display:flex; align-items:baseline; gap:6px 18px; flex-wrap:wrap; }
.site-nav .row2 { gap:6px 12px; min-height:26px; }
.site-nav .row2 #navAuth { margin-left:auto; }
.site-nav .brand { display:flex; align-items:center; gap:9px; margin-right:10px; color:var(--ink); }
.site-nav .brand a { color:inherit; }
.site-nav .brand a:hover { text-decoration:none; }
.site-nav .logo-link { display:inline-flex; align-items:center; }
.site-nav .brand-t:hover { color:var(--accent); }
.site-nav .logo-chip { background:#fff; border:1px solid var(--hairline); border-radius:6px;
  padding:2px 6px; display:inline-flex; align-items:center; }
.site-nav .logo-chip img { height:18px; width:auto; display:block; }
.site-nav .logo-ha { height:15px; width:auto; }
.site-nav .ha-dark { display:none; }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .site-nav .ha-light { display:none; }
  html:not([data-theme="light"]) .site-nav .ha-dark { display:inline; }
}
html[data-theme="dark"] .site-nav .ha-light { display:none; }
html[data-theme="dark"] .site-nav .ha-dark { display:inline; }
html[data-theme="light"] .site-nav .ha-light { display:inline; }
html[data-theme="light"] .site-nav .ha-dark { display:none; }
.site-nav .brand-t { font-family:var(--serif); font-size:15px; font-weight:700; line-height:1.15;
  display:flex; flex-direction:column; white-space:nowrap; }
.site-nav .brand-t small { font-size:9.5px; font-weight:600; color:var(--muted);
  letter-spacing:.12em; text-transform:uppercase; font-family:var(--sans); }
.site-nav .nav-date { font-size:11.5px; color:var(--muted); align-self:center; white-space:nowrap; }
.site-nav a.item { font-size:13px; color:var(--ink-2); }
.site-nav a.item:hover { color:var(--accent); text-decoration:none; }
.site-nav a.item.on { color:var(--accent); font-weight:600; }
.site-nav .lang-btn { padding:3px 10px; font-size:12px; align-self:center; }

/* ---- bilingual blocks: body[data-lang] picks which one renders ---- */
body[data-lang="en"] .lang-ko { display:none !important; }
body[data-lang="ko"] .lang-en { display:none !important; }
body:not([data-lang]) .lang-ko { display:none !important; } /* pre-JS fallback: English */

/* ---- headers ---- */
.eyebrow { font-size:11.5px; font-weight:600; letter-spacing:.14em; text-transform:uppercase;
  color:var(--accent); margin:38px 0 10px; }
h1 { font-family:var(--serif); font-size:32px; line-height:1.2; margin:0 0 10px; text-wrap:balance; }
h2 { font-family:var(--serif); font-size:22px; margin:44px 0 8px; }
h3 { font-family:var(--serif); font-size:17px; margin:26px 0 8px; }
.lede { color:var(--ink-2); margin:0 0 6px; }
.sub { color:var(--ink-2); font-size:13.5px; margin:0 0 16px; }
.meta { display:flex; flex-wrap:wrap; gap:6px 18px; margin:14px 0 0; font-size:12.5px; color:var(--muted); }
.meta b { color:var(--ink-2); font-weight:600; }

/* ---- cards & rows ---- */
.card { background:var(--surface); border:1px solid var(--hairline); border-radius:12px; padding:16px 18px; }
.cards { display:grid; grid-template-columns:repeat(auto-fit,minmax(250px,1fr)); gap:14px; }
.rows { border-top:1px solid var(--hairline); }
.row { display:flex; gap:14px; padding:12px 2px; border-bottom:1px solid var(--hairline); font-size:13.5px; }
.note { border:1px solid var(--hairline); border-left:3px solid var(--accent); border-radius:0 10px 10px 0;
  background:var(--surface); padding:12px 16px; font-size:13.5px; margin:14px 0; }

/* ---- tables ---- */
.scroll { overflow-x:auto; border:1px solid var(--hairline); border-radius:12px; background:var(--surface); }
table { border-collapse:collapse; width:100%; font-size:13px; }
th, td { padding:9px 12px; text-align:left; vertical-align:top; border-top:1px solid var(--hairline); }
thead th { border-top:none; font-size:10.5px; font-weight:600; letter-spacing:.09em;
  text-transform:uppercase; color:var(--muted); background:var(--wash); white-space:nowrap; }
td.num, th.num, .tnum { font-variant-numeric:tabular-nums; white-space:nowrap; }
tr.phase td { background:var(--wash); font-size:10.5px; font-weight:600; letter-spacing:.09em;
  text-transform:uppercase; color:var(--accent); padding:6px 12px; }

/* ---- pills & badges ---- */
.pill { display:inline-block; padding:1px 9px; border-radius:999px; background:var(--wash);
  border:1px solid var(--hairline); font-size:11px; color:var(--ink-2); white-space:nowrap; }
.pill.acc { color:var(--accent); border-color:var(--accent); background:transparent; }
.pill.fill { background:var(--accent); color:var(--accent-ink); border-color:var(--accent); font-weight:700; }
.st { display:inline-block; min-width:20px; text-align:center; border-radius:6px;
  font-size:11.5px; padding:1px 7px; font-variant-numeric:tabular-nums; }
.st.ok { background:var(--wash); color:var(--ok); border:1px solid var(--hairline); }
.st.due { background:var(--wash); color:var(--warn); border:1px solid var(--hairline); }
.st.late { background:var(--wash); color:var(--warn); border:1px solid var(--warn); font-weight:700; }
.st.miss { background:transparent; color:var(--muted); border:1px dashed var(--hairline); }

/* ---- lists, code ---- */
ul, ol { margin:8px 0; padding-left:22px; }
li { margin:4px 0; }
li::marker { color:var(--muted); }
code { font-family:var(--mono); font-size:.9em; background:var(--wash); padding:1px 5px; border-radius:5px; }
pre { background:var(--surface); border:1px solid var(--hairline); border-radius:12px;
  padding:14px 16px; overflow-x:auto; font-family:var(--mono); font-size:12.5px; line-height:1.6; }
pre code { background:none; padding:0; }
blockquote { margin:10px 0; padding:9px 14px; border-left:3px solid var(--accent);
  background:var(--surface); border-radius:0 8px 8px 0; }

/* ---- buttons ---- */
.btn { display:inline-block; border:1px solid var(--hairline); background:var(--surface); color:var(--ink);
  border-radius:10px; padding:7px 12px; font-size:13px; cursor:pointer; font-family:var(--sans); }
.btn:hover { background:var(--wash); text-decoration:none; }
.btn.primary { background:var(--accent); color:var(--accent-ink); border-color:var(--accent); }

footer.site { margin-top:64px; padding-top:18px; border-top:1px solid var(--hairline);
  font-size:12px; color:var(--muted); line-height:1.8; }
@media print {
  .site-nav, footer.site { display:none; }
  body { background:#fff; color:#000; }
}

/* ---- class gate overlay ---- */
#gateOverlay { position:fixed; inset:0; z-index:1000; background:var(--page);
  display:flex; align-items:center; justify-content:center; padding:24px; }
#gateOverlay .gate-card { background:var(--surface); border:1px solid var(--hairline);
  border-radius:14px; padding:26px 28px; width:min(400px, 94vw); }
#gateOverlay input { width:100%; padding:9px 11px; border:1px solid var(--hairline);
  border-radius:10px; background:var(--page); color:var(--ink); font-size:14px; margin:0 0 10px; }