/* ══════════════════════════════════════════════════════════════════
   slide-deck-base.css — scroll-snap slide engine + nav chrome
   Part of forge slide-templates/ layer.
   Inline AFTER: reset.css, typography.css, aesthetics/<name>.css.

   Relies on forge token contract: --bg, --surface, --border,
   --text, --text-muted, --text-dim, --accent, --accent-dim,
   --accent-glow, --error (all 6 aesthetics must ship these).

   Ships 3 V1 slide types (title, content, closing).
   V2 appends: section, diagram, table, code, quote, image, comparison.
   ══════════════════════════════════════════════════════════════════ */

/* ── Type Scale ── */
:root {
  --fs-display: clamp(48px,  8vw,  120px);
  --fs-heading: clamp(28px,  4vw,  48px);
  --fs-body:    clamp(16px,  2vw,  24px);
  --fs-caption: clamp(10px,  1vw,  14px);
}

/* ── Deck container + slides ── */
html, body { height: 100%; }
body.deck-body { overflow: hidden; }  /* opt-in so non-deck pages unaffected */

.deck {
  height: 100dvh;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  background: var(--bg);
  color: var(--text);
}

.slide {
  height: 100dvh;
  scroll-snap-align: start;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(40px, 6vh, 80px) clamp(40px, 8vw, 120px);
  isolation: isolate;
  opacity: 0;
  transform: translateY(40px) scale(0.98);
  transition:
    opacity   0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide.visible {
  opacity: 1;
  transform: none;
}

/* ── Staggered child reveals (use class="reveal" on children) ── */
.slide .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity   0.5s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide.visible .reveal { opacity: 1; transform: none; }
.slide.visible .reveal:nth-child(1) { transition-delay: 0.10s; }
.slide.visible .reveal:nth-child(2) { transition-delay: 0.20s; }
.slide.visible .reveal:nth-child(3) { transition-delay: 0.30s; }
.slide.visible .reveal:nth-child(4) { transition-delay: 0.40s; }
.slide.visible .reveal:nth-child(5) { transition-delay: 0.50s; }
.slide.visible .reveal:nth-child(6) { transition-delay: 0.60s; }

/* Explicit stagger override via --i (index) */
.slide.visible .reveal[style*="--i"] {
  transition-delay: calc(var(--i) * 0.10s);
}

/* ── Reduced motion — kill switch ── */
@media (prefers-reduced-motion: reduce) {
  .deck { scroll-behavior: auto; }
  .slide,
  .slide .reveal,
  .slide * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    animation: none !important;
  }
  /* Nav chrome lives outside .slide — kill its animations too */
  .deck-progress,
  .deck-dot,
  .deck-hints {
    transition: none !important;
    animation: none !important;
  }
}

/* ══════════════════════════════════════════════════════════════════
   NAV CHROME
   ══════════════════════════════════════════════════════════════════ */

/* ── Progress bar (top) ── */
.deck-progress {
  position: fixed; top: 0; left: 0;
  height: 3px; width: 0;
  background: var(--accent);
  z-index: 100;
  transition: width 0.3s ease;
  pointer-events: none;
}

/* ── Dot indicator (right side) ── */
.deck-dots {
  position: fixed;
  right: clamp(12px, 2vw, 24px); top: 50%;
  transform: translateY(-50%);
  display: flex; flex-direction: column;
  gap: 8px;
  z-index: 100;
  padding: 8px;
  background: color-mix(in srgb, var(--bg) 60%, transparent 40%);
  border-radius: 20px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.deck-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text-dim);
  opacity: 0.3;
  border: none; padding: 0;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.deck-dot:hover  { opacity: 0.6; }
.deck-dot:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  opacity: 1;
}
.deck-dot.active { opacity: 1; transform: scale(1.5); background: var(--accent); }

/* ── Slide counter (bottom right) ── */
.deck-counter {
  position: fixed;
  bottom: clamp(12px, 2vh, 24px);
  right:  clamp(12px, 2vw, 24px);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 12px;
  color: var(--text-dim);
  z-index: 100;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

/* ── Keyboard hints (bottom center) ── */
.deck-hints {
  position: fixed;
  bottom: clamp(12px, 2vh, 24px);
  left: 50%;
  transform: translateX(-50%);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 11px;
  color: var(--text-dim);
  opacity: 0.6;
  z-index: 100;
  transition: opacity 0.5s ease;
  white-space: nowrap;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  pointer-events: none;
}
.deck-hints.faded { opacity: 0; }

/* ══════════════════════════════════════════════════════════════════
   SHARED SLIDE ELEMENTS
   ══════════════════════════════════════════════════════════════════ */

.slide__display {
  font-size: var(--fs-display);
  font-weight: 600;
  letter-spacing: -2px;
  line-height: 0.95;
  text-wrap: balance;
}

.slide__heading {
  font-size: var(--fs-heading);
  font-weight: 600;
  letter-spacing: -0.5px;
  line-height: 1.15;
  text-wrap: balance;
  margin: 0;
}

.slide__body {
  font-size: var(--fs-body);
  line-height: 1.55;
  color: var(--text-muted);
  text-wrap: pretty;
  max-width: 68ch;
}

.slide__subtitle {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: clamp(12px, 1.5vw, 18px);
  color: var(--text-dim);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.slide__label {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--fs-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 12px;
}

.slide__decor {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}

/* Auto-fit wrapper — autoFit() JS applies transform:scale to this */
.slide-inner {
  width: 100%;
  transform-origin: center center;
}

/* ══════════════════════════════════════════════════════════════════
   V1 SLIDE TYPES — title, content, closing
   (V2 appends section, diagram, table, code, quote, image, comparison)
   ══════════════════════════════════════════════════════════════════ */

/* ── title ── opening deck slide */
.slide--title {
  justify-content: center;
  align-items: center;
  text-align: center;
  background-image:
    radial-gradient(ellipse at 50% 30%, var(--accent-dim) 0%, transparent 50%);
}

.slide--title .slide__display {
  color: var(--accent);
  max-width: 20ch;
}

.slide--title .slide__subtitle {
  margin-top: 1.25rem;
}

/* ── content ── bullet / prose body */
.slide--content {
  justify-content: center;
}

.slide--content .slide__heading {
  max-width: 22ch;
  margin-bottom: 1.5rem;
}

.slide--content ul,
.slide--content ol {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  max-width: 68ch;
  font-size: var(--fs-body);
  color: var(--text-muted);
}

.slide--content li {
  padding-left: 1.75rem;
  position: relative;
  line-height: 1.5;
}

.slide--content li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

.slide--content ol {
  counter-reset: slide-ol;
}
.slide--content ol li {
  counter-increment: slide-ol;
}
.slide--content ol li::before {
  content: counter(slide-ol, decimal-leading-zero);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.85em;
}

/* ── closing ── final CTA / sign-off */
.slide--closing {
  justify-content: center;
  align-items: center;
  text-align: center;
  background-image:
    radial-gradient(ellipse at 50% 70%, var(--accent-dim) 0%, transparent 60%);
}

.slide--closing .slide__heading {
  color: var(--accent);
  max-width: 22ch;
}

.slide--closing .slide__body {
  max-width: 50ch;
  margin-top: 1rem;
}

.slide--closing .cta {
  margin-top: 2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  color: var(--accent);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  text-decoration: none;
}

.slide--closing .cta:hover {
  background: var(--accent-dim);
}

/* ══════════════════════════════════════════════════════════════════
   RESPONSIVE — small-screen sanity
   ══════════════════════════════════════════════════════════════════ */

@media (max-height: 600px) {
  .slide { padding: 24px clamp(24px, 6vw, 64px); }
}

@media (max-width: 640px) {
  .deck-dots  { right: 8px; gap: 6px; }
  .deck-dot   { width: 6px; height: 6px; }
  .deck-hints { display: none; }
}

/* ══════════════════════════════════════════════════════════════════
   V2 SLIDE TYPES — section, diagram, table, code, quote, image, comparison
   ══════════════════════════════════════════════════════════════════ */

/* ── section ── breathing-room divider with oversized numeral */
.slide--section {
  justify-content: center;
  text-align: left;
  padding: clamp(40px, 6vh, 80px) clamp(40px, 8vw, 140px);
}
.slide--section .slide__number {
  font-size: clamp(100px, 22vw, 260px);
  font-weight: 200;
  line-height: 0.85;
  opacity: 0.08;
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -55%);
  pointer-events: none;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.slide--section .slide__content {
  position: relative;
  z-index: 1;
}
.slide--section .slide__subtitle {
  margin-top: 1rem;
  color: var(--text-dim);
  max-width: 50ch;
}

/* ── diagram ── in-slide Mermaid or fgraph */
.slide--diagram {
  padding: clamp(24px, 4vh, 48px) clamp(32px, 6vw, 80px);
  justify-content: center;
  gap: 1.25rem;
}
.slide--diagram .slide__heading {
  font-size: clamp(22px, 3vw, 36px);
  margin-bottom: 0.5rem;
  text-align: center;
}
.slide--diagram .slide__diagram-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-height: 75vh;
  overflow: hidden;
}
.slide--diagram .slide__diagram-wrap svg,
.slide--diagram .slide__diagram-wrap .fgraph-wrap {
  width: 100%;
  max-width: 100%;
  max-height: 75vh;
  height: auto;
}
.slide--diagram .slide__caption {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--fs-caption);
  color: var(--text-dim);
  text-align: center;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ── table ── presentation-scale data grid */
.slide--table {
  padding: clamp(32px, 5vh, 60px) clamp(32px, 5vw, 80px);
}
.slide--table .slide__heading {
  font-size: clamp(22px, 3vw, 36px);
  margin-bottom: 1.25rem;
  text-align: center;
}
.slide--table .table-scroll {
  max-height: 70vh;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.slide--table table {
  width: 100%;
  border-collapse: collapse;
  font-size: clamp(14px, 1.6vw, 18px);
}
.slide--table th,
.slide--table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.slide--table th {
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.75em;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: sticky; top: 0;
}
.slide--table tbody tr:hover { background: var(--surface); }
.slide--table td { color: var(--text-muted); }

/* ── code ── code-focused slide */
.slide--code {
  padding: clamp(32px, 5vh, 60px) clamp(32px, 5vw, 80px);
  justify-content: center;
}
.slide--code .slide__heading {
  font-size: clamp(22px, 3vw, 36px);
  margin-bottom: 1rem;
  text-align: center;
}
.slide--code .slide__code-block {
  max-height: 70vh;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  padding: 1rem 1.25rem;
  position: relative;
}
.slide--code .slide__code-filename {
  position: absolute;
  top: -0.75rem; left: 1rem;
  background: var(--bg);
  padding: 0 0.5rem;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 1px;
  text-transform: uppercase;
}
.slide--code pre {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: clamp(13px, 1.5vw, 18px);
  line-height: 1.55;
  color: var(--text);
  white-space: pre;
  overflow-x: auto;
}
.slide--code .hl { color: var(--accent); font-weight: 600; }
.slide--code .cm { color: var(--text-dim); font-style: italic; }

/* ── quote ── pull-quote / callout */
.slide--quote {
  justify-content: center;
  align-items: center;
  text-align: center;
  background-image:
    radial-gradient(ellipse at 50% 50%, var(--accent-dim) 0%, transparent 35%);
}
.slide--quote .slide__quote-mark {
  font-size: clamp(80px, 15vw, 200px);
  line-height: 0.6;
  color: var(--accent);
  opacity: 0.3;
  margin-bottom: 0.5rem;
  font-family: Georgia, serif;
}
.slide--quote blockquote {
  font-size: clamp(24px, 4vw, 48px);
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.5px;
  max-width: 24ch;
  margin: 0 auto;
  color: var(--text);
  text-wrap: balance;
}
.slide--quote cite {
  display: block;
  margin-top: 1.5rem;
  font-style: normal;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: var(--fs-caption);
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dim);
}

/* ── image ── full-bleed image slide */
.slide--image {
  padding: 0;
  position: relative;
  overflow: hidden;
}
.slide--image .slide__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.slide--image .slide__bg--gradient {
  background:
    linear-gradient(135deg, var(--accent) 0%, var(--bg) 100%);
}
.slide--image .slide__scrim {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.55) 70%, rgba(0,0,0,0.85) 100%);
  z-index: 1;
}
.slide--image .slide__content {
  position: relative;
  z-index: 2;
  padding: clamp(40px, 6vh, 80px) clamp(40px, 8vw, 120px);
  margin-top: auto;
  max-width: 70ch;
}
.slide--image .slide__heading,
.slide--image .slide__label,
.slide--image .slide__subtitle {
  color: #fff;
  text-shadow: 0 2px 12px rgba(0,0,0,0.6);
}

/* ── comparison ── 2-column side-by-side */
.slide--comparison {
  padding: clamp(32px, 5vh, 60px) clamp(32px, 5vw, 80px);
}
.slide--comparison .slide__heading {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: clamp(22px, 3vw, 36px);
}
.slide--comparison .slide__columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(16px, 3vw, 40px);
  align-items: stretch;
}
.slide--comparison .slide__col {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.slide--comparison .slide__col h3 {
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 600;
  margin: 0;
  color: var(--text);
}
.slide--comparison .slide__col.accent {
  border-color: var(--accent);
  background: var(--accent-dim);
}
.slide--comparison .slide__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
  font-size: clamp(14px, 1.6vw, 18px);
  color: var(--text-muted);
}
.slide--comparison .slide__col li {
  padding-left: 1.25rem;
  position: relative;
}
.slide--comparison .slide__col li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

@media (max-width: 700px) {
  .slide--comparison .slide__columns { grid-template-columns: 1fr; }
}