/* Deck styles — low visual density. One idea per slide. */

html, body { height: 100%; }

body {
  background: var(--surface-deep);
  color: var(--ink);
  overflow-x: hidden;
}

.deck {
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  overflow-y: auto;
  height: 100vh;
}

.slide {
  scroll-snap-align: start;
  scroll-snap-stop: always;
  height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(2rem, 6vh, 5rem) clamp(1.5rem, 6vw, 6rem);
  position: relative;
  background: var(--surface);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 5%, transparent);
}

.slide-inner {
  width: 100%;
  max-width: 1120px;
  position: relative;
  z-index: 1;
}

.slide.ink {
  background: var(--ink);
  color: var(--ink-inverted);
}
.slide.ink h1, .slide.ink h2, .slide.ink h3 { color: var(--ink-inverted); }
.slide.ink p, .slide.ink li { color: color-mix(in srgb, var(--ink-inverted) 85%, transparent); }
.slide.ink .eyebrow { color: var(--accent); }

.slide.cream { background: var(--surface-soft); }

.slide h1 { font-size: clamp(2.6rem, 6vw, 5rem); line-height: 1.05; font-weight: 500; }
.slide h2 { font-size: clamp(1.8rem, 3.5vw, 3rem); line-height: 1.15; margin-bottom: 1rem; font-weight: 600; }
.slide h3 { font-size: 1.5rem; font-weight: 600; }
.slide p  { font-size: clamp(1rem, 1.2vw, 1.2rem); line-height: 1.6; max-width: 64ch; }
.slide .eyebrow { font-size: 0.78rem; letter-spacing: 0.22em; }

.slide-no {
  position: absolute;
  bottom: 1.2rem;
  right: 1.5rem;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
}
.slide.ink .slide-no { color: color-mix(in srgb, var(--ink-inverted) 55%, transparent); }

.slide-brand {
  position: absolute;
  top: 1.2rem;
  left: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
}
.slide.ink .slide-brand { color: color-mix(in srgb, var(--ink-inverted) 70%, transparent); }
.slide-brand img { width: 20px; height: 20px; }

.pull-quote {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3.6rem);
  line-height: 1.15;
  max-width: 24ch;
  font-weight: 500;
}

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 1.5rem; } }

.split-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
@media (max-width: 900px) { .split-3 { grid-template-columns: 1fr; } }

/* Comparison matrix */
.matrix { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
.matrix th, .matrix td { text-align: left; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--rule); }
.matrix th { font-weight: 600; font-family: var(--font-serif); color: var(--ink); background: var(--surface-soft); }
.matrix td { color: var(--ink-soft); vertical-align: top; }
.matrix tr.us td { background: color-mix(in srgb, var(--accent) 9%, transparent); color: var(--ink); font-weight: 500; }
.matrix .yes { color: var(--ok); font-weight: 600; }
.matrix .no  { color: var(--danger); font-weight: 600; }
.matrix .mid { color: var(--accent); font-weight: 600; }

/* Help overlay */
.help {
  position: fixed;
  inset: auto 1rem 1rem auto;
  background: var(--ink);
  color: var(--ink-inverted);
  padding: 0.75rem 0.9rem;
  border-radius: 6px;
  font-size: 0.75rem;
  box-shadow: var(--shadow-2);
  z-index: 40;
  display: none;
  max-width: 320px;
}
.help.show { display: block; }
.help kbd {
  font-family: monospace;
  background: color-mix(in srgb, var(--ink-inverted) 15%, transparent);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-size: 0.72rem;
}

.progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; background: color-mix(in srgb, var(--ink) 8%, transparent); z-index: 30; }
.progress > span { display: block; height: 100%; background: var(--accent); width: 0%; transition: width 180ms var(--ease); }

.mini-nav { position: fixed; bottom: 1rem; left: 1rem; display: flex; gap: 0.4rem; z-index: 30; }
.mini-nav button {
  appearance: none;
  background: var(--ink);
  color: var(--ink-inverted);
  border: 0;
  border-radius: 6px;
  padding: 0.45rem 0.7rem;
  font-size: 0.8rem;
  cursor: pointer;
  box-shadow: var(--shadow-1);
}
.mini-nav button:hover { opacity: 0.9; }
.mini-nav button.primary { background: var(--accent); color: var(--ink); }

/* Principle cards */
.principle { padding: 1.25rem 1.5rem; border: 1px solid var(--rule); border-radius: 8px; background: var(--surface-raised); }
.principle .num { font-family: var(--font-serif); font-size: 0.8rem; color: var(--accent); letter-spacing: 0.14em; text-transform: uppercase; font-weight: 600; }
.principle h3 { margin: 0.25rem 0 0.4rem; font-size: 1.1rem; }
.principle p { font-size: 0.92rem; margin: 0; color: var(--ink-soft); }

/* PRINT — 1 slide per A4 landscape page, suitable for browser Save-as-PDF */
@media print {
  @page { size: A4 landscape; margin: 10mm; }
  body { background: white; }
  .deck { overflow: visible; height: auto; scroll-snap-type: none; }
  .help, .mini-nav, .progress { display: none !important; }
  .slide {
    page-break-after: always;
    page-break-inside: avoid;
    height: auto;
    min-height: 180mm;
    padding: 14mm 18mm;
    border: 0;
  }
  .slide.ink { background: var(--ink) !important; color: var(--ink-inverted) !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .slide.ink h1, .slide.ink h2, .slide.ink h3 { color: var(--ink-inverted) !important; }
  .slide h1 { font-size: 32pt; }
  .slide h2 { font-size: 22pt; }
  .slide p, .slide li { font-size: 11pt; }
  .slide .eyebrow { font-size: 9pt; }
  .slide-no { bottom: 6mm; right: 8mm; }
  .slide-brand { top: 6mm; left: 8mm; }
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}