/* ===== MATLAB Set Ops — presentation web (dark theme) ===== */
:root {
  --bg: #0b1220;
  --bg2: #0f172a;
  --panel: #172033;
  --panel2: #1e293b;
  --line: #2b3a52;
  --text: #e6edf7;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent2: #f472b6;
  --accent3: #4ade80;
  --code-bg: #0a1018;
  --topbar-h: 56px;
  --bottombar-h: 40px;
  --font-body: 'EmbedThai', 'Thonburi', 'Leelawadee UI', 'Tahoma', 'Arial Unicode MS', sans-serif;
  --font-code: 'EmbedCode', 'EmbedThai', 'EmbedSym', 'Menlo', 'Consolas', monospace;
  --font-sym: 'EmbedSym', 'Arial Unicode MS', sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: radial-gradient(1200px 700px at 12% -10%, #16233c 0%, var(--bg) 55%) fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  overflow: hidden;
}

/* ---------- top bar ---------- */
.topbar {
  height: var(--topbar-h);
  display: flex; align-items: center; gap: 16px;
  padding: 0 20px;
  background: rgba(10,17,29,.85);
  border-bottom: 1px solid var(--line);
  position: relative; z-index: 20;
}
.topbar .brand { font-weight: 700; letter-spacing: .2px; font-size: 15px; }
.topbar .brand span { color: var(--accent); }
.topbar .spacer { flex: 1; }
.btn {
  appearance: none; cursor: pointer;
  background: var(--panel2); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 7px 12px; font-family: inherit; font-size: 14px;
  display: inline-flex; align-items: center; gap: 7px;
  transition: .15s;
}
.btn:hover { border-color: var(--accent); color: #fff; background: #22304a; }
.btn .k {
  font-family: var(--font-code); font-size: 11px;
  background: #0a1018; border: 1px solid var(--line); border-radius: 5px;
  padding: 1px 5px; color: var(--muted);
}
.mode-switch { display: flex; background: #0a1018; border: 1px solid var(--line); border-radius: 11px; overflow: hidden; }
.mode-switch button {
  appearance: none; border: 0; background: transparent; color: var(--muted);
  font-family: inherit; font-size: 14px; padding: 7px 14px; cursor: pointer;
}
.mode-switch button.on { background: var(--accent); color: #041018; font-weight: 700; }

/* ---------- stage / slides ---------- */
.stage { position: relative; height: calc(100vh - var(--topbar-h) - var(--bottombar-h)); }
.view { display: none; height: 100%; }
.view.on { display: block; }

.slide {
  position: absolute; inset: 0;
  display: none; overflow: auto;
  padding: 40px 56px 56px;
}
.slide.active { display: block; animation: fade .22s ease; }
@keyframes fade { from { opacity:
0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.slide-inner { max-width: 1180px; margin: 0 auto; }
.slide.cover { display: none; }
.slide.cover.active { display: block; }
.slide.cover .slide-inner { height: 100%; }
.slide h2 {
  font-size: clamp(24px, 2.1vw, 34px);
  margin: 0 0 6px; line-height: 1.25;
}
.slide h2 .file { color: var(--accent); }
.slide .sub { color: var(--muted); margin: 0 0 22px; font-size: 16px; }
.rule { height: 3px; width: 62px; background: var(--accent); border-radius: 3px; margin: 0 0 22px; }

/* ---------- cover ---------- */
.cover { height: 100%; display: flex; flex-direction: column; justify-content: center; gap: 6px; }
.cover .kicker { color: var(--accent); letter-spacing: 3px; font-size: 14px; text-transform: uppercase; }
.cover h1 { font-size: clamp(32px, 4.2vw, 58px); margin: 6px 0 4px; line-height: 1.12; }
.cover h1 em { color: var(--accent); font-style: normal; }
.cover .cover-sub { color: var(--muted); font-size: clamp(16px, 1.5vw, 21px); margin: 0 0 30px; }
.cover-members { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 26px; }
.cover-members div {
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--accent);
  border-radius: 12px; padding: 12px 18px; font-size: 17px;
}
.cover-members span { color: var(--muted); font-family: var(--font-code); font-size: 14px; display: block; }
.cover-meta { color: var(--muted); font-size: 15px; }

/* ---------- figures ---------- */
.fig { display: block; max-width: 100%; max-height: 66vh; margin: 8px auto;
  border-radius: 12px; background: #fff; padding: 6px; box-shadow: 0 10px 40px rgba(0,0,0,.45); }
.fig-cap { text-align: center; color: var(--muted); font-size: 14px; margin-top: 6px; }

/* ---------- lists / boxes ---------- */
.slide ul, .doc ul { margin: 10px 0 0; padding-left: 22px; }
.slide li, .doc li { margin: 7px 0; }
.setbox {
  font-family: var(--font-code); font-size: 19px;
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--accent2);
  border-radius: 10px; padding: 12px 16px; margin: 10px 0; display: inline-block; min-width: 320px;
}
.badge {
  display: inline-block; font-size: 13px; color: var(--accent3);
  background: rgba(74,222,128,.1); border: 1px solid rgba(74,222,128,.35);
  border-radius: 999px; padding: 3px 12px; margin: 0 6px 6px 0;
}

/* ---------- code ---------- */
.code-wrap { position: relative; margin: 14px 0; }
pre {
  margin: 0; background: var(--code-bg); border: 1px solid var(--line);
  border-radius: 12px; padding: 16px 18px; overflow: auto;
  font-family: var(--font-code); font-size: 14.5px; line-height: 1.62;
  tab-size: 4;
}
pre code { font-family: inherit; }
.notes-only { display: none; }

/* fallback highlighter colours (used when CDN unavailable) */
.hl-cmt { color: #6b7f99; font-style: italic; }
.hl-str { color: #f0a86b; }
.hl-kw  { color: #7cc4ff; font-weight: 600; }
.hl-num { color: #c792ea; }
.hl-fn  { color: #4ade80; }

/* highlight.js (CDN) tweaks */
.hljs { background: transparent !important; }

/* dependency diagram */
pre.dep { font-size: 15px; color: #cbd5e1; }

/* ---------- bottom bar ---------- */
.bottombar {
  height: var(--bottombar-h); display: flex; align-items: center; gap: 14px;
  padding: 0 20px; border-top: 1px solid var(--line);
  background: rgba(10,17,29,.85); position: relative; z-index: 20; font-size: 13px; color: var(--muted);
}
.progress { flex: 1; height: 4px; background: #16233c; border-radius: 4px; overflow: hidden; }
.progress i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width .2s; }
.counter { font-family: var(--font-code); color: var(--text); }

/* ---------- presenter notes ---------- */
.notes {
  position: fixed; left: 0; right: 0; bottom: var(--bottombar-h);
  max-height: 42vh; overflow: auto;
  background: rgba(8,14,26,.97); border-top: 2px solid var(--accent);
  padding: 16px 24px 20px; z-index: 30;
  transform: translateY(105%); transition: transform .22s ease;
}
.notes.open { transform: none; }
.notes h4 { margin: 0 0 8px; color: var(--accent); font-size: 14px; letter-spacing: 1px; text-transform: uppercase; }
.notes p { margin: 6px 0; color: #cbd5e1; font-size: 15px; }
.notes .say { color: #e6edf7; }

/* ---------- calculator ---------- */
.calc { display: grid; grid-template-columns: 300px 1fr; gap: 22px; align-items: start; }
.calc-presets { display: flex; flex-direction: column; gap: 10px; }
.preset {
  text-align: left; cursor: pointer; font-family: var(--font-code); font-size: 13.5px;
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--accent);
  color: var(--text); border-radius: 10px; padding: 10px 12px; transition: .15s;
}
.preset:hover { background: #22304a; border-left-color: var(--accent2); }
.preset small { display: block; font-family: var(--font-body); color: var(--muted); margin-top: 4px; }
.calc-out { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: center; }
.calc-rows { font-family: var(--font-code); font-size: 15px; }
.calc-rows .row { padding: 8px 12px; border-bottom: 1px dashed var(--line); display: flex; gap: 12px; }
.calc-rows .lab { color: var(--muted); min-width: 150px; }
.calc-rows .val { color: #fff; font-family: var(--font-sym); }
.calc-rows .row.hi .val { color: var(--accent3); }
svg.venn { width: 100%; max-width: 430px; height: auto; }

/* ---------- document view ---------- */
.doc { height: 100%; overflow: auto; }
.doc-inner { max-width: 960px; margin: 0 auto; padding: 34px 40px 120px; }
.doc h1 { font-size: 30px; margin: 0 0 6px; }
.doc h2 { font-size: 24px; color: var(--accent); margin: 38px 0 10px; border-bottom: 1px solid var(--line); padding-bottom: 8px; }
.doc h3 { font-size: 19px; color: #bae6fd; margin: 26px 0 8px; }
.doc p { margin: 10px 0; }
.doc blockquote { margin: 12px 0; padding: 10px 16px; border-left: 3px solid var(--accent);
  background: rgba(56,189,248,.06); border-radius: 0 8px 8px 0; color: #cbd5e1; }
.doc table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 8px 11px; text-align: left; vertical-align: top; }
.doc th { background: #16233c; color: #bae6fd; }
.doc tr:nth-child(even) td { background: rgba(255,255,255,.02); }
.doc .toc { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; margin: 18px 0; }
.doc .toc a { color: var(--accent); text-decoration: none; margin-right: 14px; }
.doc .toc a:hover { text-decoration: underline; }
.doc .filehead { display: flex; align-items: baseline; gap: 10px; margin-top: 30px; }
.doc .filehead code { color: var(--accent2); font-family: var(--font-code); font-size: 16px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 26px 0; }

.hint { color: var(--muted); font-size: 13px; }
.kbd { font-family: var(--font-code); background: #0a1018; border: 1px solid var(--line);
  border-radius: 5px; padding: 1px 6px; font-size: 12px; color: #cbd5e1; }

@media (max-width: 820px) {
  .calc { grid-template-columns: 1fr; }
  .calc-out { grid-template-columns: 1fr; }
  .slide { padding: 24px 20px 40px; }
  .doc-inner { padding: 20px 18px 90px; }
}