/* ─────────────────────────────────────────────────────────────
   Page 19 — Presentations (slide grammar)
   ───────────────────────────────────────────────────────────── */

.deck-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
@media (max-width: 900px) { .deck-row { grid-template-columns: 1fr; } }
.slide {
  aspect-ratio: 16 / 9;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.10);
  padding: 6%;
  display: flex;
  flex-direction: column;
  isolation: isolate;
}
.slide.dark {
  background:
    radial-gradient(ellipse 70% 90% at 70% 30%, rgba(47,55,255,0.32), transparent 60%),
    radial-gradient(ellipse 60% 80% at 20% 80%, rgba(132,82,255,0.18), transparent 60%),
    linear-gradient(180deg, #000000, #050818);
  color: #FFFFFF;
}
.slide.dark::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.5) 0.5px, transparent 0.5px);
  background-size: 100px 100px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black, transparent 85%);
}
.slide.light { background: #FFFFFF; color: #000; border-color: rgba(0,0,0,0.08); }
.slide > * { position: relative; z-index: 1; }

.slide .top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.slide.dark .top img { height: 14px; }
.slide.light .top img { height: 14px; }
.slide .top .ix {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.slide.dark .top .ix { color: rgba(255,255,255,0.55); }
.slide.light .top .ix { color: #767781; }
.slide .foot {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.slide.dark .foot { color: rgba(255,255,255,0.55); }
.slide.light .foot { color: #93949D; }
.slide .foot b { font-weight: 500; }
.slide.dark .foot b { color: #FFFFFF; }
.slide.light .foot b { color: #000; }

/* Title slide */
.slide.title .body {
  flex: 1;
  display: grid;
  align-items: center;
}
.slide.title h3 {
  font-size: clamp(20px, 2.6vw, 36px);
  letter-spacing: -0.026em;
  line-height: 1.05;
  font-weight: 600;
  margin: 0 0 8px;
  text-wrap: balance;
  max-width: 14ch;
}
.slide.title .sub {
  font-family: var(--font-mono);
  font-size: clamp(8px, 0.9vw, 11px);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.slide.title.dark .sub { color: rgba(255,255,255,0.55); }
.slide.title.light .sub { color: #767781; }

/* Section opener */
.slide.opener {
  align-items: flex-start;
}
.slide.opener .num {
  font-size: clamp(56px, 8vw, 120px);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.9;
  color: rgba(255,255,255,0.18);
  margin: 0;
}
.slide.opener .body {
  margin-top: auto;
}
.slide.opener h3 {
  font-size: clamp(18px, 2.2vw, 28px);
  letter-spacing: -0.024em;
  font-weight: 600;
  margin: 0;
  text-wrap: balance;
  max-width: 18ch;
}
.slide.opener .ey {
  font-family: var(--font-mono);
  font-size: clamp(8px, 0.9vw, 11px);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-300);
  margin-bottom: 10px;
}

/* Data slide */
.slide.data .body {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4%;
  align-items: center;
  padding: 4% 0;
}
.slide.data .number {
  font-size: clamp(40px, 6.4vw, 96px);
  font-weight: 600;
  letter-spacing: -0.032em;
  line-height: 0.95;
  margin: 0 0 6px;
  color: #FFFFFF;
}
.slide.data .delta {
  font-family: var(--font-mono);
  font-size: clamp(8px, 0.9vw, 11px);
  letter-spacing: 0.08em;
  color: var(--teal-300);
}
.slide.data .insight {
  font-size: clamp(11px, 1.3vw, 16px);
  line-height: 1.35;
  letter-spacing: -0.014em;
  color: #FFFFFF;
  margin: 0;
  text-wrap: balance;
}
.slide.data .ey {
  font-family: var(--font-mono);
  font-size: clamp(7px, 0.8vw, 10px);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  margin-bottom: 8px;
}

/* Quote slide */
.slide.quote .body {
  flex: 1;
  display: grid;
  align-items: center;
}
.slide.quote h3 {
  font-size: clamp(16px, 1.9vw, 24px);
  letter-spacing: -0.018em;
  line-height: 1.3;
  font-weight: 500;
  margin: 0 0 14px;
  text-wrap: balance;
}
.slide.quote h3::before {
  content: "“";
  color: var(--blue-300);
  font-size: 1.4em;
  line-height: 0.5;
  margin-right: 6px;
  vertical-align: -0.1em;
}
.slide.quote .who {
  font-family: var(--font-mono);
  font-size: clamp(7px, 0.8vw, 10px);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.slide.quote.dark .who { color: rgba(255,255,255,0.6); }
.slide.quote.light .who { color: #767781; }

/* Closing slide */
.slide.closing .body {
  flex: 1;
  display: grid;
  place-items: center;
  text-align: center;
}
.slide.closing h3 {
  font-size: clamp(18px, 2.4vw, 32px);
  letter-spacing: -0.024em;
  line-height: 1.05;
  font-weight: 600;
  margin: 0 0 12px;
  text-wrap: balance;
  max-width: 16ch;
}
.slide.closing .cta {
  display: inline-block;
  background: #FFFFFF;
  color: #000;
  padding: 8px 16px;
  border-radius: 4px;
  font-size: clamp(8px, 0.9vw, 11px);
  font-weight: 500;
}

/* Slide info caption */
.slide-info {
  padding: 14px 4px 4px;
}
.slide-info .ix {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-300);
  margin-bottom: 4px;
}
.slide-info .name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.008em;
  color: var(--fg-default);
  margin-bottom: 4px;
}
.slide-info p {
  font-size: 12.5px;
  color: var(--fg-secondary);
  line-height: 1.55;
  margin: 0;
}

/* Format ratios row */
.ratio-row {
  display: grid;
  grid-template-columns: 1.6fr 1.2fr 0.6fr;
  gap: 14px;
  align-items: end;
}
@media (max-width: 720px) { .ratio-row { grid-template-columns: 1fr; } }
.ratio-cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ratio-cell .frame {
  background:
    radial-gradient(ellipse at 50% 50%, rgba(47,55,255,0.18), transparent 65%),
    linear-gradient(180deg, #000000, #050818);
  border: 1px solid rgba(255,255,255,0.10);
  display: grid;
  place-items: center;
  color: rgba(255,255,255,0.55);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.ratio-cell.r-16x9 .frame { aspect-ratio: 16 / 9; }
.ratio-cell.r-4x3  .frame { aspect-ratio: 4 / 3; }
.ratio-cell.r-9x16 .frame { aspect-ratio: 9 / 16; }
.ratio-cell .meta .name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--fg-default);
}
.ratio-cell .meta p {
  font-size: 12px;
  color: var(--fg-muted);
  line-height: 1.5;
  margin: 4px 0 0;
}

/* Speaker notes block */
.notes-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
@media (max-width: 820px) { .notes-card { grid-template-columns: 1fr; } }
.notes-card .left {
  padding: 28px 30px;
  background:
    radial-gradient(ellipse 60% 100% at 100% 0%, rgba(47,55,255,0.10), transparent 65%),
    rgba(255,255,255,0.02);
  border-right: 1px solid var(--border-subtle);
}
@media (max-width: 820px) { .notes-card .left { border-right: 0; border-bottom: 1px solid var(--border-subtle); } }
.notes-card .right {
  padding: 28px 30px;
}
.notes-card .ix {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-300);
  margin-bottom: 8px;
}
.notes-card h4 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.008em;
  margin: 0 0 12px;
  color: var(--fg-default);
}
.notes-card p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--fg-secondary);
  margin: 0 0 10px;
}
.notes-card .right p {
  font-style: italic;
  color: var(--fg-muted);
}
.notes-card .right p::before { content: "→ "; color: var(--blue-300); font-style: normal; }