/* ITD 140 — Machine Learning I — course export shell
   Design: institutional navy (carried from the syllabus header) + a single
   "best-fit line" vermilion accent, grounded in the module's own lessons
   (1.4 y = mx + b, 1.5 correlation). Mono labels reference the Jupyter/code
   subject matter. Embedded Canvas content keeps its own inline styling. */

:root{
  --navy:#0d2440;
  --navy-2:#163a63;
  --ink:#1c2430;
  --muted:#5b6878;
  --line:#e4ddd0;
  --line-strong:#cdbfa8;
  --paper:#fbf9f4;
  --paper-2:#f3eee3;
  --card:#ffffff;
  --accent:#e0452b;      /* regression line */
  --accent-deep:#b8341f;
  --focus:#1f7ae0;
  --maxw:920px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent-deep);text-underline-offset:2px;text-decoration-thickness:1px}
a:hover{color:var(--accent)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:3px}
img{max-width:100%;height:auto}

.mono{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.eyebrow{
  font-family:"JetBrains Mono",ui-monospace,monospace;
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent-deep);font-weight:600;
}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:20;
  background:rgba(13,36,64,.96);
  -webkit-backdrop-filter:saturate(140%) blur(6px);
  backdrop-filter:saturate(140%) blur(6px);
  border-bottom:1px solid #0a1c33;
}
.topbar-inner{
  max-width:var(--maxw);margin:0 auto;padding:11px 22px;
  display:flex;align-items:center;gap:14px;
}
.topbar a{color:#dce6f2;text-decoration:none;font-size:.86rem}
.topbar a:hover{color:#fff}
.topbar .home{
  font-family:"Space Grotesk","Inter",sans-serif;font-weight:600;
  color:#fff;letter-spacing:-.01em;display:flex;align-items:center;gap:9px;
}
.topbar .tag{font-family:"JetBrains Mono",monospace;font-size:.66rem;color:#7f97b4;
  border:1px solid #2a4a72}
.topbar .crumbs{margin-left:auto;color:#9fb2cb;font-size:.8rem;
  font-family:"JetBrains Mono",monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar .crumbs a{color:#9fb2cb}
.topbar .crumbs .sep{opacity:.5;margin:0 7px}

.mark{width:22px;height:22px;flex:0 0 auto}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--navy);color:#eaf1f9}
.hero-grid{position:absolute;inset:0;opacity:.5}
.hero-inner{
  position:relative;max-width:var(--maxw);margin:0 auto;
  padding:64px 22px 56px;
}
.hero .kicker{font-family:"JetBrains Mono",monospace;font-size:.74rem;
  letter-spacing:.2em;text-transform:uppercase;color:#ff8a6e;font-weight:500}
.hero h1{
  font-family:"Space Grotesk","Inter",sans-serif;
  font-weight:600;letter-spacing:-.02em;line-height:1.04;
  font-size:clamp(2.1rem,5.4vw,3.5rem);margin:.5rem 0 .2rem;color:#fff;
}
.hero .sub{color:#aebfd6;max-width:46ch;font-size:1.02rem;margin:.7rem 0 0}
.hero .meta{
  margin-top:26px;display:flex;flex-wrap:wrap;gap:8px 9px;
  font-family:"JetBrains Mono",monospace;font-size:.74rem;
}
.hero .meta span{
  border:1px solid rgba(255,255,255,.16);
  padding:5px 10px;border-radius:999px;color:#cdd9e9;
}

/* ---------- layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.section{padding:46px 0}
main{min-height:54vh}
.lead{color:var(--muted);max-width:60ch;margin:.4rem 0 0}

/* ---------- module cards (home) ---------- */
.modgrid{display:grid;gap:18px;margin-top:26px}
@media(min-width:680px){.modgrid{grid-template-columns:1fr 1fr}}
.modcard{
  display:block;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:24px 24px 22px;text-decoration:none;color:inherit;
  position:relative;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease;
}
.modcard:hover{transform:translateY(-3px);box-shadow:0 14px 34px -20px rgba(13,36,64,.45);
  border-color:var(--line-strong)}
.modcard .num{
  font-family:"Space Grotesk",sans-serif;font-weight:600;font-size:2.4rem;
  color:var(--accent);line-height:1;letter-spacing:-.03em;
}
.modcard h3{font-family:"Space Grotesk",sans-serif;font-weight:600;
  margin:.5rem 0 .35rem;font-size:1.22rem;letter-spacing:-.01em;color:var(--navy)}
.modcard p{margin:0;color:var(--muted);font-size:.92rem}
.modcard .go{margin-top:16px;font-family:"JetBrains Mono",monospace;font-size:.76rem;
  color:var(--accent-deep);font-weight:600}

/* ---------- module page item list ---------- */
.grouphead{
  display:flex;align-items:baseline;gap:12px;margin:38px 0 4px;
  padding-bottom:8px;border-bottom:2px solid var(--navy);
}
.grouphead:first-of-type{margin-top:18px}
.grouphead h2{font-family:"Space Grotesk",sans-serif;font-weight:600;
  font-size:1.16rem;margin:0;color:var(--navy);letter-spacing:-.01em}
.grouphead .count{font-family:"JetBrains Mono",monospace;font-size:.72rem;color:var(--muted)}

.items{list-style:none;margin:0;padding:0}
.item{border-bottom:1px solid var(--line)}
.item a,.item .row{
  display:flex;align-items:center;gap:14px;padding:14px 6px;
  text-decoration:none;color:inherit;
}
.item a:hover{background:var(--paper-2)}
.item .ico{
  flex:0 0 auto;width:34px;height:34px;border-radius:8px;display:grid;place-items:center;
  background:var(--paper-2);border:1px solid var(--line);color:var(--navy-2);
}
.item .ico svg{width:17px;height:17px;display:block}
.item .body{min-width:0;flex:1}
.item .t{display:block;font-weight:540;color:var(--ink);line-height:1.3}
.item a:hover .t{color:var(--accent-deep)}
.item .d{display:block;font-family:"JetBrains Mono",monospace;font-size:.71rem;color:var(--muted);margin-top:3px}
.item .ext{flex:0 0 auto;color:var(--muted)}
.item.is-sub .t{color:var(--muted)}
.badge{
  flex:0 0 auto;font-family:"JetBrains Mono",monospace;font-size:.64rem;letter-spacing:.06em;
  text-transform:uppercase;padding:3px 8px;border-radius:999px;border:1px solid var(--line-strong);
  color:var(--muted);background:#fff;
}
.badge.pptx{color:#9a3412;border-color:#f0c8a8;background:#fff6ef}
.badge.ext{color:#1d4ed8;border-color:#c2d4f7;background:#f2f6ff}
.badge.dl{color:var(--accent-deep);border-color:#f0c0b6;background:#fff4f1}

/* ---------- content page ---------- */
.page-head{padding:34px 0 22px;border-bottom:1px solid var(--line);margin-bottom:30px}
.page-head .eyebrow{display:block;margin-bottom:9px}
.page-head h1{font-family:"Space Grotesk",sans-serif;font-weight:600;letter-spacing:-.015em;
  font-size:clamp(1.6rem,3.6vw,2.3rem);margin:0;color:var(--navy);line-height:1.12}
.page-head .facts{margin-top:14px;display:flex;flex-wrap:wrap;gap:7px;
  font-family:"JetBrains Mono",monospace;font-size:.72rem}
.page-head .facts span{background:var(--paper-2);border:1px solid var(--line);
  padding:4px 9px;border-radius:6px;color:var(--muted)}
.page-head .facts span b{color:var(--navy);font-weight:600}

/* host for embedded Canvas html — let inline styles lead, just give it room */
.content{padding-bottom:40px}
.content :where(h1,h2,h3,h4){font-family:"Space Grotesk","Inter",sans-serif}
.content table{max-width:100%}
.content img{border-radius:4px}
.content a{word-break:break-word}

.backnav{margin:8px 0 0}
.backnav a{font-family:"JetBrains Mono",monospace;font-size:.78rem;text-decoration:none;
  color:var(--accent-deep);font-weight:600}
.backnav a:hover{text-decoration:underline}

.pager{display:flex;justify-content:space-between;gap:14px;margin:10px 0 8px;
  border-top:1px solid var(--line);padding-top:20px}
.pager a{flex:1;text-decoration:none;border:1px solid var(--line);border-radius:10px;
  padding:12px 15px;color:inherit;background:var(--card);transition:border-color .15s}
.pager a:hover{border-color:var(--line-strong)}
.pager .lbl{font-family:"JetBrains Mono",monospace;font-size:.68rem;color:var(--muted);
  text-transform:uppercase;letter-spacing:.08em}
.pager .ttl{font-weight:560;color:var(--navy);margin-top:3px;font-size:.92rem}
.pager .next{text-align:right}
.pager .ghost{visibility:hidden}

/* ---------- footer ---------- */
footer{background:var(--navy);color:#9fb2cb;margin-top:50px}
footer .wrap{padding:30px 22px;display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;
  font-size:.8rem;font-family:"JetBrains Mono",monospace}
footer a{color:#cdd9e9}
footer .dot{opacity:.4}

@media (prefers-reduced-motion:reduce){*{transition:none!important}}
@media(max-width:520px){
  .topbar .crumbs{display:none}
  .hero-inner{padding:46px 18px 40px}
  .item a,.item .row{padding:13px 4px}
}