/* =========================================================================
   Sound, Systems, Computational Imagination — Guest Lecture Deck
   Patrick Hartono · Universitas Bunda Mulia, Jakarta
   ========================================================================= */

:root {
  /* Palette — DARK (default) */
  --bg:           #0a0a0f;
  --bg-2:         #111118;
  --fg:           #e8e8ec;
  --fg-2:         #9b9ba3;
  --fg-3:         #6b6b73;
  --rule:         #1f1f29;
  --cyan:         #5eead4; /* system, computational, machine */
  --amber:        #fbbf24; /* sound, human, embodied */
  --ph-bg:        #14141c;
  --ph-stripe:    rgba(155,155,163,0.06);
  --grain-opacity: 0.035;
  --grain-blend:  overlay;
  /* p5 sketch background — RGB components so sketches can read via CSS */
  --sketch-bg-r:  10;
  --sketch-bg-g:  10;
  --sketch-bg-b:  15;

  /* Type */
  --serif:  "IBM Plex Serif", "Fraunces", Georgia, serif;
  --sans:   "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono:   "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;

  --type-display:   148px;
  --type-title:     84px;
  --type-section:   64px;
  --type-subtitle:  52px;
  --type-quote:     56px;
  --type-body:      32px;
  --type-list:      30px;
  --type-small:     26px;
  --type-mono:      24px;
  --type-mono-sm:   20px;

  --pad-x:          120px;
  --pad-top:        120px;
  --pad-bottom:     112px;
  --gap-title:      56px;
  --gap-item:       28px;

  --line-tight:     1.08;
  --line-snug:      1.2;
  --line-relaxed:   1.4;
}

/* Palette — LIGHT */
:root[data-theme="light"] {
  --bg:           #f6f4ee;   /* warm off-white */
  --bg-2:         #ecebe3;
  --fg:           #18181f;
  --fg-2:         #555560;
  --fg-3:         #8c8c95;
  --rule:         #d8d6cd;
  --cyan:         #0d7a70;   /* darker teal for contrast on light */
  --amber:        #b45309;   /* darker amber for contrast on light */
  --ph-bg:        #e6e4dc;
  --ph-stripe:    rgba(24,24,31,0.06);
  --grain-opacity: 0.05;
  --grain-blend:  multiply;
  --sketch-bg-r:  246;
  --sketch-bg-g:  244;
  --sketch-bg-b:  238;
}

/* =========================================================================
   Stage container + grain
   ========================================================================= */
html, body {
  margin: 0;
  background: #000;
  font-family: var(--sans);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

deck-stage:not(:defined) { visibility: hidden; }

deck-stage section {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: var(--type-body);
  line-height: var(--line-relaxed);
  overflow: hidden;
  position: relative;
  isolation: isolate;
}

/* Subtle grain — applied to every slide via ::after */
deck-stage section::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  opacity: var(--grain-opacity);
  mix-blend-mode: var(--grain-blend);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

/* =========================================================================
   Slide chrome — corners, progress, footer (per-slide containers)
   ========================================================================= */
.slide-pad {
  position: absolute;
  inset: 0;
  padding: var(--pad-top) var(--pad-x) var(--pad-bottom);
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

.corner {
  position: absolute;
  font-family: var(--mono);
  font-size: var(--type-mono-sm);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--fg-3);
  z-index: 10;
  user-select: none;
}
.corner.tr  { top: 56px;    right: 64px;  text-align: right; }
.corner.bl  { bottom: 56px; left: 64px; }
.corner.br  { bottom: 56px; right: 64px; }
.corner.tl  { top: 56px;    left: 64px; }

.corner .sect-num { color: var(--cyan); margin-right: 12px; }
.corner .slug { color: var(--fg-2); }

/* Footer URL strip */
.source {
  position: absolute;
  left: 64px;
  right: 64px;
  bottom: 24px;
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--fg-3);
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  z-index: 10;
  pointer-events: none;
}
.source a { color: var(--fg-3); text-decoration: none; pointer-events: auto; }
.source a:hover { color: var(--amber); }
.source .lbl { color: var(--cyan); margin-right: 8px; }

/* p5 sketch canvas wrapper */
.sketch-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.sketch-bg canvas { display: block; width: 100%; height: 100%; }

.content { z-index: 2; }

/* =========================================================================
   Typography utilities
   ========================================================================= */
.serif      { font-family: var(--serif); font-weight: 400; }
.sans       { font-family: var(--sans); }
.mono       { font-family: var(--mono); }
.italic     { font-style: italic; }
.upper      { text-transform: uppercase; letter-spacing: 0.18em; }
.t-cyan     { color: var(--cyan); }
.t-amber    { color: var(--amber); }
.t-mute     { color: var(--fg-2); }
.t-faint    { color: var(--fg-3); }

.eyebrow {
  font-family: var(--mono);
  font-size: var(--type-mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 var(--gap-title);
}

.eyebrow.amber { color: var(--amber); }
.eyebrow .dash { color: var(--fg-3); margin: 0 18px; }

.h-display {
  font-family: var(--serif);
  font-size: var(--type-display);
  line-height: var(--line-tight);
  font-weight: 400;
  letter-spacing: -0.02em;
  margin: 0;
}
.h-title {
  font-family: var(--serif);
  font-size: var(--type-title);
  line-height: var(--line-tight);
  font-weight: 400;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: pretty;
}
.h-section {
  font-family: var(--serif);
  font-size: var(--type-section);
  line-height: var(--line-tight);
  letter-spacing: -0.01em;
  margin: 0;
}
.h-subtitle {
  font-family: var(--serif);
  font-size: var(--type-subtitle);
  line-height: var(--line-snug);
  font-weight: 400;
  letter-spacing: -0.005em;
  margin: 0;
}
.h-quote {
  font-family: var(--serif);
  font-size: var(--type-quote);
  line-height: var(--line-snug);
  font-style: italic;
  margin: 0;
  max-width: 1500px;
  text-wrap: pretty;
}
.body {
  font-family: var(--sans);
  font-size: var(--type-body);
  line-height: var(--line-relaxed);
  color: var(--fg);
  max-width: 1200px;
  text-wrap: pretty;
}
.body.tight { max-width: 1000px; }
.body.wide  { max-width: 1500px; }
.lead {
  font-family: var(--sans);
  font-size: var(--type-subtitle);
  line-height: 1.25;
  color: var(--fg);
  font-weight: 300;
  max-width: 1500px;
  text-wrap: pretty;
}

/* =========================================================================
   Layouts
   ========================================================================= */
.fill { flex: 1; }
.col  { display: flex; flex-direction: column; }
.row  { display: flex; flex-direction: row; }
.gap-title  { gap: var(--gap-title); }
.gap-item   { gap: var(--gap-item); }
.gap-32     { gap: 32px; }
.gap-48     { gap: 48px; }
.gap-64     { gap: 64px; }
.gap-80     { gap: 80px; }
.center-y   { justify-content: center; }
.center-x   { align-items: center; }
.between    { justify-content: space-between; }
.flex-1     { flex: 1 1 0; min-width: 0; }

.split-2  { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.split-3  { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 56px; }
.split-asym { display: grid; grid-template-columns: 1.2fr 1fr; gap: 96px; }
.split-asym-r { display: grid; grid-template-columns: 1fr 1.2fr; gap: 96px; }

ul.bullets, ol.bullets {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-item);
}
ul.bullets li, ol.bullets li {
  font-size: var(--type-list);
  line-height: 1.35;
  padding-left: 44px;
  position: relative;
  text-wrap: pretty;
  max-width: 1100px;
}
ul.bullets li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.62em;
  width: 24px;
  height: 1px;
  background: var(--cyan);
}
ul.bullets.amber li::before { background: var(--amber); }
ol.bullets { counter-reset: step; }
ol.bullets li { counter-increment: step; }
ol.bullets li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0; top: 0.1em;
  font-family: var(--mono);
  font-size: 22px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.rule {
  height: 1px;
  background: var(--rule);
  border: 0;
  margin: 0;
}
.rule.amber { background: linear-gradient(90deg, var(--amber), transparent); height: 1px; }
.rule.cyan  { background: linear-gradient(90deg, var(--cyan),  transparent); height: 1px; }

/* Big section divider numbers */
.divider {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-rows: 1fr auto 1fr;
  padding: 0 var(--pad-x);
}
.divider .midline {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 88px;
  align-items: end;
}
.divider .num {
  font-family: var(--mono);
  font-size: 220px;
  line-height: 0.9;
  color: var(--cyan);
  letter-spacing: -0.03em;
}
.divider .num.amber { color: var(--amber); }
.divider .title-wrap { padding-bottom: 18px; }
.divider .kicker {
  font-family: var(--mono);
  font-size: var(--type-mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 24px;
}
.divider .name {
  font-family: var(--serif);
  font-size: 96px;
  line-height: 1;
  letter-spacing: -0.015em;
  font-weight: 400;
}

/* Image / asset placeholder */
.placeholder {
  position: relative;
  background:
    repeating-linear-gradient(
      135deg,
      var(--ph-stripe) 0px,
      var(--ph-stripe) 14px,
      transparent 14px,
      transparent 28px
    ),
    var(--ph-bg);
  border: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-3);
  font-family: var(--mono);
  font-size: var(--type-mono-sm);
  letter-spacing: 0.08em;
  text-align: center;
  padding: 32px;
  box-sizing: border-box;
  overflow: hidden;
}
.placeholder .ph-label { max-width: 80%; }
.placeholder .ph-tag {
  position: absolute;
  top: 20px; left: 24px;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}
.placeholder.ratio-16x9 { aspect-ratio: 16/9; }
.placeholder.ratio-4x3  { aspect-ratio: 4/3; }
.placeholder.ratio-1x1  { aspect-ratio: 1/1; }

.cap {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--fg-2);
  margin-top: 18px;
  letter-spacing: 0.04em;
}

/* Tag pill */
.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 18px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
  padding: 8px 14px;
  border: 1px solid currentColor;
  border-radius: 999px;
  white-space: nowrap;
}
.tag.amber { color: var(--amber); }
.tag.mute  { color: var(--fg-3); border-color: var(--rule); }

/* Project mini-card (current research network) */
.proj-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 32px 32px 28px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
}
.proj-card .head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}
.proj-card .who {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.proj-card .status {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--amber);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.proj-card .title {
  font-family: var(--serif);
  font-size: 38px;
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.proj-card .blurb {
  font-size: 20px;
  line-height: 1.4;
  color: var(--fg-2);
}

/* Source/reference list */
.ref-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 80px;
  row-gap: 22px;
  font-family: var(--mono);
  font-size: 17px;
  line-height: 1.4;
  color: var(--fg-2);
}
.ref-list .ref-head {
  grid-column: 1 / -1;
  font-size: 14px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-top: 18px;
}
.ref-list .ref-head:first-child { margin-top: 0; }
.ref-list a { color: var(--fg-2); text-decoration: none; }
.ref-list a:hover { color: var(--fg); }

/* Big metric / centered focus slide */
.center-stage {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--pad-top) var(--pad-x) var(--pad-bottom);
  text-align: center;
}

.equation {
  font-family: var(--serif);
  font-style: italic;
  font-size: 120px;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.equation .op { color: var(--fg-3); margin: 0 28px; font-style: normal; }
.equation .res { color: var(--amber); font-style: normal; }
.equation .a { color: var(--cyan); font-style: normal; }
.equation .b { color: var(--amber); font-style: normal; }

/* Trajectory map (timeline) */
.timeline {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0;
  margin-top: 32px;
}
.timeline .node {
  position: relative;
  padding: 22px 16px 18px;
  border-top: 1px solid var(--rule);
}
.timeline .node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--cyan);
  border-radius: 50%;
}
.timeline .node:last-child::before { background: var(--amber); }
.timeline .where {
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 0.06em;
  color: var(--fg-3);
}
.timeline .what {
  font-family: var(--serif);
  font-size: 24px;
  line-height: 1.2;
  margin-top: 8px;
  color: var(--fg);
}

/* QR / contact closing */
.qr {
  width: 320px;
  height: 320px;
  background:
    linear-gradient(45deg, transparent 48%, var(--fg-3) 48%, var(--fg-3) 52%, transparent 52%),
    repeating-conic-gradient(var(--fg) 0% 25%, #14141c 0% 50%);
  background-size: 20px 20px;
  border: 12px solid var(--fg);
}

/* Animations */
@keyframes pulse-soft {
  0%, 100% { opacity: 0.45; }
  50%      { opacity: 0.85; }
}
.pulse { animation: pulse-soft 3.6s ease-in-out infinite; }

/* Network diagram (Section 6 overview) */
.network {
  position: relative;
  width: 100%;
  flex: 1;
  min-height: 0;
}
.network svg { width: 100%; height: 100%; display: block; }
.network .node-label {
  position: absolute;
  font-family: var(--mono);
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--fg);
  background: var(--bg);
  padding: 8px 12px;
  border: 1px solid var(--rule);
  transform: translate(-50%, -50%);
  white-space: nowrap;
}
.network .node-label.center {
  background: var(--bg);
  border-color: var(--amber);
  color: var(--amber);
  font-family: var(--serif);
  font-style: italic;
  font-size: 22px;
  padding: 12px 18px;
}
.network .node-label .col {
  font-family: var(--sans);
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 4px;
}

/* Print: deck-stage handles page-per-slide automatically */

/* =========================================================================
   Trinity diagram — three-way contract (slide 13)
   ========================================================================= */
.trinity-diagram {
  position: relative;
  width: 100%;
  max-width: 560px;
  aspect-ratio: 440 / 380;
  margin: 0 auto;
}
.trinity-diagram svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}
.trinity-diagram .node {
  transform-origin: center;
  transform-box: fill-box;
  animation: trinity-pulse 3.6s ease-in-out infinite;
}
.trinity-diagram .node-text  { animation-delay: 0s; }
.trinity-diagram .node-sound { animation-delay: -1.2s; }
.trinity-diagram .node-image { animation-delay: -2.4s; }

@keyframes trinity-pulse {
  0%, 100% { transform: scale(1);    opacity: 0.85; }
  50%      { transform: scale(1.18); opacity: 1;    }
}

.trinity-diagram .t-node-label {
  position: absolute;
  font-family: var(--mono);
  font-size: 18px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  white-space: nowrap;
  pointer-events: none;
}
.trinity-diagram .t-node-label.text  { color: var(--fg); }
.trinity-diagram .t-node-label.sound { color: var(--amber); }
.trinity-diagram .t-node-label.image { color: var(--cyan); }

@media (prefers-reduced-motion: reduce) {
  .trinity-diagram .node { animation: none; }
  .trinity-diagram animateMotion { display: none; }
}

/* =========================================================================
   Theme toggle button — fixed top-right of viewport
   ========================================================================= */
#theme-toggle {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 9999;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 999px;
  color: var(--fg);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  padding: 0;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
#theme-toggle:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.22);
  transform: scale(1.04);
}
:root[data-theme="light"] #theme-toggle {
  background: rgba(0,0,0,0.04);
  border-color: rgba(0,0,0,0.14);
  color: #18181f;
}
:root[data-theme="light"] #theme-toggle:hover {
  background: rgba(0,0,0,0.08);
  border-color: rgba(0,0,0,0.22);
}
#theme-toggle svg { width: 20px; height: 20px; display: block; }
@media print { #theme-toggle { display: none !important; } }