/* ============================================================
   Adam Web Presentation — Warm Academic Design
   Ported from MATH 3850 Course Guide design system.
   ============================================================ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;0,8..60,700;1,8..60,400&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-base: #17171c;
  --bg-raised: #1e1e25;
  --bg-surface: #25252e;
  --bg-surface-alt: #2a2a34;
  --bg-hover: #30303c;

  --text-primary: #e8e4dc;
  --text-secondary: #a8a49c;
  --text-muted: #706c64;

  --accent-warm: #d4956a;
  --accent-gold: #c9a84c;
  --accent-sage: #6aab8e;
  --accent-blue: #6b8fbd;
  --accent-rose: #c47070;
  --accent-lilac: #9b89b6;

  --border-subtle: #2e2e38;
  --border-medium: #3a3a46;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ===========================================
   SLIDE LAYOUT
   =========================================== */
.slide {
  display: none;
  width: 100vw;
  height: 100vh;
  padding: 36px 72px 56px;
  overflow-y: auto;
  flex-direction: column;
  scrollbar-width: thin;
  scrollbar-color: var(--border-medium) transparent;
}
.slide::-webkit-scrollbar { width: 6px; }
.slide::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: 3px; }
.slide.active {
  display: flex;
}

.slide-inner {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  flex: 1;
}

/* Title slide centering */
.slide.title-slide {
  justify-content: center;
  align-items: center;
  text-align: center;
}
.slide.title-slide .slide-inner {
  max-width: 800px;
}

/* ===========================================
   TYPOGRAPHY (larger for projection)
   =========================================== */
h1 {
  font-family: 'Source Serif 4', Georgia, serif;
  color: var(--text-primary);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 12px;
}

h2 {
  font-family: 'Source Serif 4', Georgia, serif;
  color: var(--accent-warm);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 32px 0 14px 0;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  font-style: italic;
  font-family: 'Source Serif 4', Georgia, serif;
  margin-bottom: 16px;
}

p { margin-bottom: 14px; line-height: 1.75; }
p:last-child { margin-bottom: 0; }
strong { color: var(--text-primary); font-weight: 600; }

.tag {
  display: inline-block;
  background: var(--accent-lilac);
  color: var(--bg-base);
  padding: 2px 14px;
  border-radius: 3px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
  font-family: 'Inter', sans-serif;
}

.section-label {
  display: inline-block;
  color: var(--accent-lilac);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
  font-family: 'Inter', sans-serif;
}

/* ===========================================
   CONTENT COMPONENTS (from course guide)
   =========================================== */

/* Analogy boxes */
.analogy {
  background: var(--bg-raised);
  border-left: 3px solid var(--accent-warm);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 18px 0;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1rem;
  line-height: 1.75;
}

/* Formula boxes */
.formula-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-top: 3px solid var(--accent-blue);
  border-radius: var(--radius-sm);
  padding: 22px 26px;
  margin: 20px 0;
}

/* Why boxes */
.why-box {
  background: rgba(106, 171, 142, 0.07);
  border: 1px solid rgba(106, 171, 142, 0.2);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 18px 0;
}
.why-box h3 {
  color: var(--accent-sage);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

/* Note boxes */
.note {
  background: var(--bg-raised);
  border-left: 3px solid var(--accent-lilac);
  padding: 14px 18px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 16px 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Result/finding boxes */
.result-box {
  background: rgba(106, 171, 142, 0.07);
  border: 1px solid rgba(106, 171, 142, 0.2);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 18px 0;
}
.result-box h3 {
  color: var(--accent-sage);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

/* Algorithm boxes */
.algo-box {
  border-left: 3px solid var(--accent-blue);
  padding: 18px 22px;
  margin: 18px 0;
  background: var(--bg-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.92rem;
  line-height: 1.85;
}
.algo-box .algo-title {
  color: var(--accent-warm);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 12px;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.02em;
}

/* Algorithm sections (init/loop) */
.algo-section {
  border-left: 3px solid;
  padding-left: 14px;
  margin: 16px 0;
}
.algo-section.init { border-color: var(--accent-gold); }
.algo-section.loop { border-color: var(--accent-sage); }
.algo-section .section-title {
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.algo-section.init .section-title { color: var(--accent-gold); }
.algo-section.loop .section-title { color: var(--accent-sage); }

.algo-line {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  gap: 10px;
  align-items: start;
  padding: 8px 12px;
  margin: 2px 0;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
}
.algo-line:nth-child(even) { background: var(--bg-raised); }
.algo-line .num {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-family: 'JetBrains Mono', monospace;
  text-align: right;
}
.algo-line .formula {
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
}
.algo-line .explain {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: right;
  font-style: italic;
  font-family: 'Inter', sans-serif;
  white-space: nowrap;
}

/* Breakdown grids */
.breakdown {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 5px 18px;
  margin: 14px 0;
  font-size: 0.95rem;
}
.breakdown dt {
  color: var(--accent-warm);
  text-align: right;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
}
.breakdown dd {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Tables */
.step-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 0.92rem;
  font-family: 'Inter', sans-serif;
}
.step-table th {
  background: var(--bg-surface);
  color: var(--accent-warm);
  padding: 10px 14px;
  text-align: center;
  border-bottom: 2px solid var(--border-medium);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.step-table td {
  padding: 8px 14px;
  border-bottom: 1px solid var(--border-subtle);
  text-align: center;
  color: var(--text-secondary);
}
.step-table tr:hover td {
  background: var(--bg-surface);
  color: var(--text-primary);
}
.step-table .highlight td {
  color: var(--accent-sage);
  font-weight: 600;
}

/* ===========================================
   CODE BLOCKS
   =========================================== */
.code-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-top: 3px solid var(--accent-blue);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 16px 0;
  overflow-x: auto;
}
.code-block pre {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-primary);
  white-space: pre;
}
.code-block .code-title {
  color: var(--accent-warm);
  font-weight: 700;
  font-size: 0.82rem;
  margin-bottom: 10px;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* Syntax colors */
.code-block .kw { color: var(--accent-lilac); }      /* keywords: class, def, for, if, return */
.code-block .fn { color: var(--accent-blue); }        /* function names */
.code-block .cm { color: var(--text-muted); font-style: italic; }  /* comments */
.code-block .st { color: var(--accent-sage); }        /* strings */
.code-block .nb { color: var(--accent-gold); }        /* builtins: np, self */
.code-block .op { color: var(--text-secondary); }     /* operators */
.code-block .num { color: var(--accent-rose); }       /* numbers */

/* ===========================================
   LAYOUT UTILITIES
   =========================================== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}
.three-col {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.col-card {
  background: var(--bg-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
}
.col-card h3 {
  color: var(--accent-warm);
  margin-bottom: 10px;
  font-size: 1.05rem;
}

/* Plot images */
.plot-img {
  width: 100%;
  object-fit: contain;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* Stacked plot layout: two graphs vertically with side panel */
.plot-stack {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.plot-stack .plot-img {
  width: 100%;
  max-height: 34vh;
  object-fit: contain;
}

/* Three-plot horizontal row for hyperparameters */
.plot-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}
.plot-row-3 .plot-img {
  width: 100%;
}

.plot-caption {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 3px;
  margin-bottom: 0;
  font-style: italic;
}

/* Utility */
.hl { color: var(--accent-sage); font-weight: 600; }
.warm { color: var(--accent-warm); font-weight: 600; }
.gold { color: var(--accent-gold); font-weight: 600; }
.blue { color: var(--accent-blue); }
.rose { color: var(--accent-rose); }
.muted { color: var(--text-muted); }
.mono { font-family: 'JetBrains Mono', monospace; }
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-sm { margin-top: 12px; }
.mb-sm { margin-bottom: 12px; }

/* SVG styling */
svg text { font-family: 'Inter', system-ui, sans-serif; }

/* KaTeX */
.katex { font-size: 1.1em; }
.katex-display { margin: 16px 0; overflow-x: auto; padding: 4px 0; }

/* ===========================================
   PROGRESS BAR + SLIDE COUNTER
   =========================================== */
.progress-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--bg-surface);
  z-index: 400;
}
.progress-fill {
  height: 100%;
  background: var(--accent-warm);
  transition: width 0.3s ease;
}

.slide-counter {
  position: fixed;
  bottom: 10px;
  right: 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  z-index: 400;
}

.nav-hint {
  position: fixed;
  bottom: 10px;
  left: 20px;
  font-size: 0.7rem;
  color: var(--text-muted);
  z-index: 400;
  font-family: 'Inter', sans-serif;
  opacity: 0.6;
}

/* Speaker notes removed; script is a separate PDF */

/* ===========================================
   SCROLLBAR
   =========================================== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

::selection {
  background: rgba(212, 149, 106, 0.3);
  color: var(--text-primary);
}

/* ===========================================
   RESPONSIVE
   =========================================== */
@media (max-width: 900px) {
  .slide { padding: 32px 24px 60px; }
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.3rem; }
  .two-col, .three-col { grid-template-columns: 1fr; }
  .breakdown { grid-template-columns: 1fr; }
  .breakdown dt { text-align: left; }
}