/* ══════════════════════════════════════════════
   Brooklyn College — Critical AI Literacy Institute
   Dark theme · soft grey-blue hue
   Based on cuny-ai-intro deck engine
   ══════════════════════════════════════════════ */

:root {
  --bg:          #0f1319;
  --fg:          rgba(218,225,232,0.92);
  --muted:       rgba(190,200,215,0.55);
  --accent:      #8aa8c7;
  --part:        #8b9bb5;
  --card:        rgba(180,200,220,0.055);
  --stroke:      rgba(180,200,220,0.13);
  --radius:      14px;
  --header-h:    48px;
  --footer-h:    72px;
  --stage-min:    160px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; background: var(--bg); color: var(--fg); overflow: hidden; touch-action: manipulation; }
body { font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }

.skip-link {
  position: absolute; top: -100px; left: 12px; z-index: 100;
  padding: 8px 16px; background: var(--accent); color: #000;
  border-radius: 6px; font-size: 14px; font-weight: 600;
}
.skip-link:focus { top: 12px; }

/* ── HEADER ── */
header {
  position: fixed; inset: 0 0 auto 0; height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  background: linear-gradient(to bottom, rgba(15,19,25,.72), transparent);
  z-index: 20; pointer-events: none;
}
header .bar { pointer-events: auto; display: flex; align-items: center; gap: 8px; }
.kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  border: 1px solid rgba(180,200,220,0.08); background: transparent;
  padding: 2px 7px; border-radius: 6px; font-size: 11px; opacity: 0.45; color: var(--muted);
  letter-spacing: 0.02em;
}

/* ── STICKY FOOTER SLIDER ── */
.sticky-footer {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 30;
  background: linear-gradient(to top, rgba(15,19,25,.97), rgba(15,19,25,.4) 40%, transparent);
  padding: 10px 16px 12px; pointer-events: none;
  backdrop-filter: blur(12px);
}
.footer-slider {
  max-width: 95vw; margin: 0 auto; pointer-events: auto;
  display: flex; flex-direction: row; gap: 10px; align-items: center;
}
.footer-logo {
  height: clamp(36px, 5vw, 60px); width: auto; flex-shrink: 0;
  opacity: 0.75; pointer-events: none;
  object-fit: contain;
}
.footer-arrow {
  display: inline-flex; width: 28px; height: 28px; flex-shrink: 0;
  border-radius: 6px; border: 1px solid rgba(180,200,220,0.10);
  background: rgba(180,200,220,0.04); color: var(--muted);
  cursor: pointer; align-items: center; justify-content: center;
  font-size: 13px; transition: background 0.15s, opacity 0.15s; opacity: 0.7;
}
.footer-arrow:hover { background: rgba(180,200,220,0.09); opacity: 1; }
.footer-arrow:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.footer-meta {
  display: flex; align-items: center; gap: 8px; flex-shrink: 0;
  font-size: 12px; color: rgba(180,200,220,0.45); font-variant-numeric: tabular-nums;
}
.footer-meta .kbd { font-size: 10px; padding: 1px 6px; opacity: 0.6; }
.footer-deck-link {
  font-size: 13px; color: var(--accent); opacity: 0.6;
  text-decoration: none; letter-spacing: 0.01em;
  transition: opacity 0.15s;
}
.footer-deck-link:hover { opacity: 1; }
.header-deck-link { display: none; }
.slider-track {
  position: relative; flex: 1; height: 3px;
  background: rgba(180,200,220,0.10);
  border-radius: 2px; overflow: visible;
}
.slider-progress {
  position: absolute; top: 0; left: 0; height: 100%;
  background: rgba(180,200,220,0.55);
  width: 5%; transition: width 0.2s ease; border-radius: 2px;
}
.slider-thumb {
  position: absolute; top: -5px; width: 13px; height: 13px;
  left: calc(5% - 6px); border-radius: 50%; pointer-events: none;
  background: rgba(180,200,220,0.80);
  box-shadow: 0 1px 4px rgba(0,0,0,0.5);
  transition: left 0.2s ease, transform 0.15s ease; z-index: 2;
}
.slider-track:hover .slider-thumb { transform: scale(1.2); }
#slide-scrubber {
  position: absolute; top: -10px; left: 0; width: 100%; height: 23px;
  opacity: 0; cursor: grab; margin: 0;
  -webkit-appearance: none; appearance: none; touch-action: manipulation;
}
#slide-scrubber:active { cursor: grabbing; }
#slide-scrubber::-webkit-slider-thumb { -webkit-appearance: none; appearance: none; width: 22px; height: 22px; border-radius: 50%; background: transparent; cursor: grab; }
#slide-scrubber::-moz-range-thumb { width: 22px; height: 22px; border-radius: 50%; background: transparent; cursor: grab; border: none; }
@media (pointer: coarse) {
  .slider-track { height: 6px; border-radius: 3px; }
  .slider-thumb { width: 22px; height: 22px; top: -8px; left: calc(5% - 11px); }
  #slide-scrubber { height: 48px; top: -21px; }
  #slide-scrubber::-webkit-slider-thumb { width: 44px; height: 44px; }
  #slide-scrubber::-moz-range-thumb { width: 44px; height: 44px; }
  .footer-arrow { width: 36px; height: 36px; font-size: 15px; }
}
@media (max-width: 900px) {
  .footer-deck-link { display: none; }
  .header-deck-link {
    display: block; pointer-events: auto;
    font-size: 13px; color: var(--accent); opacity: 0.55;
    text-decoration: none; letter-spacing: 0.01em;
  }
}
@media (max-width: 600px) {
  .sticky-footer { padding: 8px 10px 10px; }
  .footer-meta .kbd { display: none; }
}

/* ── SLIDE HOST ── */
main { height: 100%; position: relative; }

section.slide {
  display: none; position: absolute; inset: 0;
  flex-direction: column;
  padding: var(--header-h) 12px calc(12px + var(--footer-h)); gap: 10px;
  overflow-y: auto; overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}
section.slide.active { display: flex; }

/* ── CONTENT PANEL ── */
.content {
  flex: 0 0 auto;
  display: flex; flex-direction: column; justify-content: flex-start;
  padding: clamp(28px,4vw,48px) clamp(24px,3.5vw,44px);
  border-radius: 16px;
  border: 1px solid rgba(180,200,220,0.05);
  background: rgba(180,200,220,0.025);
  backdrop-filter: blur(6px);
  min-height: 120px;
}
.content:focus { outline: none; }

/* ── STAGE SLOT ── */
.stage {
  flex: 0 0 auto; position: relative; width: 100%;
  height: auto; min-height: var(--stage-min);
  border-radius: 16px;
  border: 1px solid rgba(180,200,220,0.05);
  background: #080b10; overflow: hidden;
}

/* ── TITLE SLIDE ── */
[data-slide="title"] .content {
  justify-content: flex-start;
  padding-top: clamp(16px,2.5vw,40px);
}
[data-slide="title"] {
  flex-direction: column; align-items: stretch;
}
[data-slide="title"] .content {
  flex: 0 0 auto; overflow: visible;
  padding-bottom: clamp(12px,1.5vw,24px);
}
[data-slide="title"] .stage { flex: 1 1 auto; min-height: 80px; }
.title-credit {
  margin-top: clamp(8px,1.5vw,20px);
  display: flex; align-items: center; gap: clamp(16px,2vw,24px);
}
.title-credit .credit-names {
  font-size: clamp(15px,1.5vw,18px); color: var(--fg);
  opacity: 0.7; line-height: 1.5; letter-spacing: 0.005em;
}
.title-divider {
  margin-top: clamp(6px,1vw,14px);
  border-top: 1px solid rgba(180,200,220,0.07);
}
.title-agenda-label {
  margin-top: clamp(10px,1.5vw,18px);
  font-size: clamp(16px,1.6vw,20px); color: var(--part);
  letter-spacing: 0.08em; font-weight: 700;
}
.title-agenda {
  list-style: none; padding: 0; margin-top: 0.3em;
  counter-reset: agenda;
  display: flex; flex-direction: column; gap: 2px;
}
.title-agenda li {
  font-size: clamp(15px,1.5vw,18px); color: var(--fg); opacity: 0.55;
  letter-spacing: 0.02em; line-height: 1.7;
}
.title-agenda li::before {
  content: counter(agenda) '.';
  counter-increment: agenda;
  display: inline-block; width: 1.6em;
  color: var(--part); font-weight: 700; opacity: 1;
}

/* ── STAGE CREDIT LABEL ── */
.stage-credit {
  position: absolute; bottom: 10px; right: 12px; z-index: 2;
  font-size: 11px; color: var(--muted); opacity: 0.5;
  letter-spacing: 0.04em; pointer-events: none;
}

/* ── STAGE FILL (iframes, canvas, video) ── */
.stage-fill { position: absolute; inset: 0; }
.stage-fill iframe, .stage-fill canvas, .stage-fill video { width: 100%; height: 100%; border: none; display: block; }

/* ── STAGE INNER HELPERS ── */
.stageCenter {
  position: relative; width: 100%;
  display: flex; align-items: center; justify-content: center;
  padding: clamp(20px,3vw,36px);
}
.stageInner {
  width: 100%; max-width: 90%;
  color: rgba(218,225,232,0.86); line-height: 1.5;
}

/* step rows */
.step-grid {
  position: relative; width: 100%;
  display: flex; flex-direction: column; gap: 6px; justify-content: center;
  padding: clamp(12px,2vw,24px);
}
.step-row {
  display: flex; gap: 12px; align-items: center; padding: 12px 14px;
  border-bottom: 1px solid rgba(180,200,220,0.06);
}
.step-row:last-child { border-bottom: none; }
.step-num { width: 28px; height: 28px; border-radius: 50%; background: var(--part); color: #fff; flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; }
.step-text { font-size: clamp(15px,1.8vw,22px); color: rgba(218,225,232,0.86); line-height: 1.4; }

/* progressive reveal fragments */
.frag {
  opacity: 0; transform: translateY(5px);
  transition: opacity 0.35s ease, transform 0.35s ease;
  pointer-events: none;
}
.frag.visible {
  opacity: 1; transform: translateY(0); pointer-events: auto;
}

/* ── TYPOGRAPHY ── */
.content h1 { font-size: clamp(32px,5vw,56px); letter-spacing: -0.025em; line-height: 1.08; margin-bottom: 6px; }
.content h2 { font-size: clamp(20px,2.5vw,32px); color: var(--muted); font-weight: 500; letter-spacing: -0.01em; line-height: 1.3; margin-bottom: 8px; }
.content .label { font-size: clamp(14px,1.8vw,22px); letter-spacing: 0.12em; text-transform: uppercase; color: var(--part); font-weight: 700; margin-bottom: 8px; }
.content .date { font-size: clamp(15px,1.6vw,20px); color: var(--fg); opacity: 0.8; margin-top: 14px; }

/* ── SECTION BREAK ── */
.slide-break.active {
  align-items: flex-start; justify-content: flex-end; overflow: hidden;
  padding-bottom: clamp(32px,5vw,60px); padding-left: clamp(20px,5vw,80px);
  background: linear-gradient(140deg, #131a24 0%, var(--bg) 65%);
}
.slide-break .content { background: transparent; border: none; justify-content: flex-end; min-height: unset; }
.slide-break .content .break-tag { font-size: clamp(18px,2.4vw,28px); letter-spacing: 0.15em; text-transform: uppercase; color: var(--part); font-weight: 700; margin-bottom: 12px; }
.slide-break .content h1 { font-size: clamp(42px,8vw,92px); font-weight: 700; letter-spacing: -0.03em; line-height: 1.04; }
.slide-break::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--part); }

/* ── TABLE IN STAGE ── */
.stage-table {
  position: relative; width: 100%;
  padding: clamp(16px,2.5vw,32px);
  overflow-y: auto;
}
.stage-table table {
  width: 100%; border-collapse: collapse;
  font-size: clamp(14px,1.5vw,17px);
}
.stage-table th {
  text-align: left; padding: 8px 12px;
  border-bottom: 2px solid var(--stroke);
  color: var(--part); font-size: 12px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
}
.stage-table th:last-child { text-align: right; }
.stage-table td {
  padding: 6px 12px;
  border-bottom: 1px solid rgba(180,200,220,0.06);
  color: var(--fg);
}
.stage-table td:last-child { text-align: right; }

/* ── IMAGE IN STAGE ── */
.stage-img {
  position: relative; width: 100%; height: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: clamp(12px,2vw,24px);
}
.stage-img img {
  max-width: 100%; max-height: calc(100% - 32px);
  object-fit: contain; border-radius: 8px;
}

/* ── GALLERY (multi-image carousel in stage) ── */
.stage-gallery {
  position: relative; width: 100%; height: 100%;
}
.stage-gallery .gallery-item {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: clamp(8px,1.5vw,16px) clamp(8px,1.5vw,16px) clamp(28px,3vw,40px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.stage-gallery .gallery-item.active {
  position: relative;
  opacity: 1; pointer-events: auto;
}
.stage-gallery .gallery-item img {
  max-width: 100%; max-height: calc(100% - 24px);
  object-fit: contain; border-radius: 8px;
}
.gallery-caption {
  margin-top: 8px; text-align: center;
  font-size: clamp(14px,1.5vw,18px); color: var(--fg); opacity: 0.85;
}
.gallery-dots {
  position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 8px; z-index: 2;
}
.gallery-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: rgba(180,200,220,0.2); border: none; cursor: pointer;
  transition: background 0.2s;
}
.gallery-dot.active { background: var(--accent); }

/* ── CARD IN CONTENT ── */
.content .card {
  padding: clamp(8px,1.2vw,16px) clamp(10px,1.5vw,20px);
  background: rgba(180,200,220,0.04);
  border: 1px solid rgba(180,200,220,0.06);
  border-radius: 10px;
  margin-bottom: 6px;
}
.content .card h4 {
  font-size: clamp(16px,1.6vw,20px);
  color: var(--accent); margin-bottom: 3px; font-weight: 600;
}
.content .card p,
.content .card li {
  font-size: clamp(15px,1.5vw,18px);
  color: var(--muted); line-height: 1.45;
}
.content .card ul { padding-left: 1.1em; margin-top: 2px; }
.content .card li { margin-bottom: 1px; }

/* ── COMPACT CONTENT (dense slides) ── */
.content-compact { padding: clamp(10px,1.5vw,20px) clamp(12px,2vw,24px); }
.content-compact h1 { font-size: clamp(20px,3vw,34px); margin-bottom: 1px; }
.content-compact h2 { font-size: clamp(14px,1.6vw,22px); margin-bottom: 1px; }
.content-compact .label { margin-bottom: 2px; font-size: clamp(11px,1.2vw,16px); }
.content-compact ul { margin-top: 0.15em; padding-left: 1em; }
.content-compact li {
  font-size: clamp(11px,1.1vw,14px); line-height: 1.3; margin-bottom: 1px;
}

/* ── LISTS IN CONTENT ── */
.content ul { padding-left: 1.2em; }
.content li {
  font-size: clamp(16px,1.6vw,20px);
  color: rgba(218,225,232,0.78); line-height: 1.5;
  margin-bottom: 5px;
}
.content li strong { color: var(--fg); }

/* ── DISCUSSION / CLOSING ── */
[data-slide="discussion"] .stage {
  display: flex; align-items: center; justify-content: center;
}
.discussion-links {
  flex-direction: column; gap: clamp(32px,5vw,56px);
  align-items: center; justify-content: center;
  text-align: center;
}
.discussion-link-card {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.discussion-link-label {
  font-size: clamp(18px,2.2vw,28px); font-weight: 700;
  color: var(--fg); opacity: 0.85;
}
.discussion-link-card a {
  font-size: clamp(20px,2.5vw,32px); font-weight: 600;
  color: var(--accent); text-decoration: underline;
  text-underline-offset: 5px; text-decoration-thickness: 2px;
}

/* ── TABLET / DESKTOP ── */
@media (min-width: 720px) {
  section.slide { flex-direction: row; align-items: stretch; overflow: hidden; padding: var(--header-h) clamp(16px,2.5vw,32px) calc(16px + var(--footer-h)); gap: clamp(12px,1.5vw,20px); }
  .content { flex: 1 1 44%; overflow-y: auto; }
  .stage { flex: 1 1 52%; height: auto; align-self: stretch; min-height: unset; }
  [data-slide="title"] { flex-direction: row; }
  [data-slide="title"] .content { flex: 1 1 44%; overflow: visible; max-width: none; margin: 0; }
  [data-slide="title"] .stage { flex: 1 1 52%; min-height: unset; }
  .slide-break.active { flex-direction: column; overflow: hidden; }
  #kbdSwipe { display: none; }
  .stageCenter { position: absolute; inset: 0; width: auto; }
  .step-grid { position: absolute; inset: clamp(12px,2vw,24px); width: auto; overflow-y: auto; }
  .stage-table { position: absolute; inset: 0; width: auto; overflow-y: auto; }
  .stage-img { position: absolute; inset: 0; }
  .stage-gallery { position: absolute; inset: 0; }
  .stage-gallery .gallery-item.active { position: absolute; }
  .stage-gallery .gallery-item img { max-height: calc(100% - 40px); }
}

/* ── LARGE DESKTOP ── */
@media (min-width: 1200px) {
  section.slide { padding: var(--header-h) clamp(28px,3vw,48px) calc(20px + var(--footer-h)); gap: clamp(16px,2vw,28px); }
}
@media (max-width: 480px) {
  .content { padding: 14px 12px; }
  .content h1 { font-size: 26px; }
  .content h2 { font-size: 16px; margin-bottom: 4px; }
  .content .label { font-size: 13px; margin-bottom: 6px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* ── OVERVIEW MODE ── */
body.overview { overflow: auto; }
body.overview header { position: sticky; background: var(--bg); }
body.overview main {
  position: static; height: auto;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px; padding: 16px;
}
body.overview section.slide {
  display: flex !important; position: relative; inset: auto;
  flex-direction: column; aspect-ratio: 16 / 10; overflow: hidden;
  border-radius: 12px; border: 2px solid var(--stroke);
  background: var(--card); cursor: pointer; padding: 14px; gap: 4px;
  transition: border-color 0.15s, transform 0.15s;
}
body.overview section.slide:hover { border-color: rgba(180,200,220,0.25); transform: translateY(-2px); }
body.overview section.slide.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 4px 20px rgba(138,168,199,0.12); }
body.overview section.slide::after {
  content: attr(data-slide-num);
  position: absolute; top: 8px; right: 10px;
  font-size: 11px; font-weight: 700; color: var(--muted); opacity: 0.5;
  font-variant-numeric: tabular-nums; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
body.overview .content { flex: 0 0 auto; padding: 4px 0 0; border: none; background: transparent; backdrop-filter: none; min-height: 0; overflow: visible; }
body.overview .content h1 { font-size: 14px; line-height: 1.25; margin-bottom: 0; }
body.overview .content .label,
body.overview .slide-break .content .break-tag { font-size: 9px; margin-bottom: 4px; letter-spacing: 0.1em; }
body.overview .content h2,
body.overview .content .date,
body.overview .title-credit,
body.overview .title-agenda { display: none; }
body.overview .content ul,
body.overview .content .card { display: none; }
body.overview .stage { display: none; }
body.overview .slide-break { padding: 14px; }
body.overview .slide-break .content { justify-content: center; }
body.overview .slide-break .content h1 { font-size: 13px; }
body.overview .slide-break::before { height: 2px; }
@media (min-width: 720px) {
  body.overview section.slide { flex-direction: column; }
}