/* ============================================================
   Outsider Advantage — Business Overview Deck
   Hand-rolled CSS. No utility frameworks.
   Shell Paper ground. Shell Ink type. Signal Indigo x3 only.
   ============================================================ */

:root {
  --shell-ink: #0b0d0f;
  --shell-paper: #f5f4f0;
  --shell-900: #151719;
  --shell-400: #7a7d82;
  --shell-200: #d9d7d1;
  --signal-indigo: #3c4fe8;
  --signal-emerald: #2fb58a;

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;

  --margin-x: 120px;
  --margin-y: 96px;
  --slide-w: 1920px;
  --slide-h: 1080px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  background: var(--shell-paper);
  color: var(--shell-ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  font-feature-settings: "kern", "liga";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

body {
  font-variation-settings: "opsz" 14;
}

/* --------- Deck / slide stage -------- */

.deck {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: var(--margin-y) var(--margin-x);
  display: none;
  opacity: 0;
  background: var(--shell-paper);
  color: var(--shell-ink);
}

.slide.active {
  display: block;
  opacity: 1;
}

.slide.dark {
  background: var(--shell-900);
  color: var(--shell-paper);
}

/* Folio and bottom chrome are NOT animated */
.folio {
  position: absolute;
  top: 48px;
  left: 60px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  color: var(--shell-400);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.slide-title-meta {
  position: absolute;
  bottom: 36px;
  right: 60px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--shell-400);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.slide-counter {
  position: absolute;
  bottom: 36px;
  left: 60px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--shell-400);
  letter-spacing: 0.04em;
}

.progress-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--shell-200);
  width: 100%;
  z-index: 50;
}

.progress-fill {
  height: 100%;
  background: var(--shell-ink);
  width: 0%;
  transition: width 350ms cubic-bezier(0.19, 1, 0.22, 1);
}

/* --------- Type primitives -------- */

.display,
h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 88px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-variation-settings:
    "opsz" 144,
    "wght" 500;
  color: inherit;
}

.display-xl {
  font-size: 112px;
  line-height: 1.02;
}

h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 52px;
  line-height: 1.1;
  letter-spacing: -0.015em;
  font-variation-settings:
    "opsz" 96,
    "wght" 500;
}

h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 30px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  font-variation-settings:
    "opsz" 48,
    "wght" 600;
}

p,
.body {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 19px;
  line-height: 1.6;
  color: var(--shell-ink);
  max-width: 62ch;
  hyphens: auto;
  font-variation-settings:
    "opsz" 14,
    "wght" 400;
}

.mono,
.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--shell-400);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.eyebrow-lg {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--shell-ink);
  font-weight: 500;
  text-transform: uppercase;
}

.meta {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--shell-400);
  letter-spacing: 0.01em;
  line-height: 1.4;
}

.italic {
  font-style: italic;
  font-variation-settings:
    "opsz" 144,
    "wght" 400;
}

.indigo {
  color: var(--signal-indigo);
}

.hairline {
  height: 1px;
  background: var(--shell-200);
  border: 0;
  width: 100%;
}

.hairline-ink {
  height: 1px;
  background: var(--shell-ink);
  border: 0;
  width: 100%;
}

/* ==== Slide-specific grid ==== */

/* Cover */
.cover-frame {
  position: absolute;
  inset: 96px;
  border: 1px solid var(--shell-200);
  pointer-events: none;
}

.cover-inner {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-left: 64px;
  padding-right: 64px;
}

.cover-meta-top {
  position: absolute;
  top: 0;
  left: 64px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--shell-400);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.cover-meta-bottom {
  position: absolute;
  bottom: 0;
  right: 64px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--shell-400);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.cover-title {
  font-size: 104px;
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-variation-settings:
    "opsz" 144,
    "wght" 500;
  max-width: 18ch;
  margin-bottom: 40px;
}

.cover-sub {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--shell-400);
  max-width: 62ch;
  position: relative;
  padding-bottom: 22px;
  line-height: 1.6;
  letter-spacing: 0.01em;
  text-transform: none;
}

.cover-underline-svg {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 18px;
  width: 520px;
  overflow: visible;
}

/* Slide 2 — market truth */
.s2-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 80px;
  height: 100%;
  padding-top: 40px;
}

.s2-wall {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-auto-rows: 1fr;
  gap: 6px;
  align-content: center;
  height: 100%;
}

.s2-wall-tile {
  background: var(--shell-200);
  aspect-ratio: 1;
  opacity: 0.6;
}

.s2-wall-tile:nth-child(3n + 1) {
  opacity: 0.45;
}
.s2-wall-tile:nth-child(4n + 2) {
  opacity: 0.75;
}
.s2-wall-tile:nth-child(5n) {
  opacity: 0.35;
}

.pullquote {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  font-size: 28px;
  line-height: 1.35;
  color: var(--shell-ink);
  padding: 28px 0;
  border-top: 1px solid var(--shell-200);
  border-bottom: 1px solid var(--shell-200);
  max-width: 42ch;
  margin-top: 48px;
  font-variation-settings:
    "opsz" 96,
    "wght" 400;
}

/* Slide 3 — founder origin */
.s3-wrap {
  position: relative;
  height: 100%;
}

.s3-timeline {
  margin-top: 72px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  max-width: 1120px;
  padding-top: 40px;
  position: relative;
}

.s3-timeline::before {
  content: "";
  position: absolute;
  top: 54px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--shell-200);
}

.s3-tl-node {
  position: relative;
  padding-top: 68px;
}

.s3-tl-node::before {
  content: "";
  position: absolute;
  top: 48px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--shell-paper);
  border: 1px solid var(--shell-ink);
}

.s3-tl-year {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 500;
  color: var(--shell-ink);
  margin-bottom: 6px;
  letter-spacing: -0.005em;
}

.s3-tl-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--shell-400);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.s3-sketch-wrap {
  position: absolute;
  right: 80px;
  top: 80px;
  width: 320px;
  height: 240px;
  opacity: 0.6;
}

/* Slide 4 — unseparated practice */
.s4-wrap {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100%;
  gap: 48px;
}

.s4-columns {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 64px;
  padding-top: 24px;
}

.s4-col h3 {
  font-size: 22px;
  font-weight: 500;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--shell-400);
  margin-bottom: 24px;
  line-height: 1.3;
}

.s4-col .item {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.4;
  color: var(--shell-ink);
  padding: 24px 0;
  border-bottom: 1px solid var(--shell-200);
  font-variation-settings:
    "opsz" 48,
    "wght" 400;
}

.s4-divider {
  background: var(--shell-ink);
  width: 1px;
  height: 100%;
}

.s4-footer {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--shell-400);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.model-slot {
  min-height: 360px;
  border: 1px solid var(--shell-200);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--shell-400);
}

/* Slide 5 — what you are buying */
.s5-blocks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 56px;
  max-width: 1280px;
}

.s5-block {
  display: grid;
  grid-template-columns: 80px 1fr 220px;
  gap: 48px;
  padding: 36px 0;
  border-bottom: 1px solid var(--shell-200);
  align-items: start;
}

.s5-block:first-child {
  border-top: 1px solid var(--shell-200);
}

.s5-block-num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--shell-ink);
  letter-spacing: 0.08em;
  font-weight: 500;
  padding-top: 4px;
}

.s5-block-body h3 {
  font-size: 15px;
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--shell-ink);
  margin-bottom: 14px;
}

.s5-block-body p {
  font-size: 19px;
  max-width: 54ch;
}

.s5-block-art {
  width: 160px;
  height: 100px;
  background: var(--shell-900);
  color: var(--shell-paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.s5-block-art.paper {
  background: var(--shell-paper);
  border: 1px solid var(--shell-ink);
  color: var(--shell-ink);
}

/* Slide 6 — five commitments */
.s6-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  margin-top: 56px;
}

.s6-list {
  display: grid;
  gap: 0;
}

.s6-row {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--shell-200);
}

.s6-row:first-child {
  border-top: 1px solid var(--shell-200);
}

.s6-num {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--shell-ink);
}

.s6-body h3 {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.3;
  font-weight: 500;
  margin-bottom: 8px;
  font-variation-settings:
    "opsz" 48,
    "wght" 500;
}

.s6-body p {
  font-size: 16.5px;
  line-height: 1.55;
  color: var(--shell-400);
  max-width: 56ch;
}

/* Slide 7 — Monday morning */
.s7-inventory {
  display: grid;
  gap: 0;
  margin-top: 44px;
  max-width: 1440px;
}

.s7-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 48px;
  padding: 28px 0;
  border-bottom: 1px solid var(--shell-200);
  align-items: start;
}

.s7-row:first-child {
  border-top: 1px solid var(--shell-200);
}

.s7-art {
  width: 140px;
  height: 90px;
  background: var(--shell-900);
  color: var(--shell-paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-align: center;
  padding: 8px;
  line-height: 1.3;
}

.s7-art.paper {
  background: var(--shell-paper);
  border: 1px solid var(--shell-ink);
  color: var(--shell-ink);
}

.s7-art.indigo-dot {
  position: relative;
}

.s7-art.indigo-dot::after {
  content: "";
  position: absolute;
  top: 10px;
  right: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal-indigo);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.85);
  }
}

.s7-body h3 {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.3;
  margin-bottom: 8px;
  font-variation-settings:
    "opsz" 48,
    "wght" 500;
}

.s7-body p {
  font-size: 16.5px;
  color: var(--shell-400);
  max-width: 64ch;
}

/* Slide 8 — calibration day */
.s8-timeline-svg {
  width: 100%;
  height: 220px;
  margin-top: 56px;
}

.s8-phases {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
  max-width: 1440px;
}

.s8-phase {
  padding: 20px 0;
  border-top: 1px solid var(--shell-ink);
}

.s8-phase-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--shell-400);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
}

.s8-phase h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 6px;
  font-variation-settings:
    "opsz" 48,
    "wght" 500;
}

.s8-phase p {
  font-size: 14px;
  color: var(--shell-400);
  line-height: 1.5;
}

.s8-phase.halt .s8-phase-num {
  color: var(--shell-ink);
  font-weight: 600;
}

.s8-phase.locked {
  border-top-color: var(--signal-indigo);
}

.s8-phase.locked .s8-phase-num {
  color: var(--signal-indigo);
  font-weight: 600;
}

/* Slide 9 — evidence */
.s9-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 56px;
  margin-top: 56px;
}

.s9-col .eyebrow-lg {
  display: block;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--shell-200);
}

.s9-ref {
  padding: 14px 0;
  border-bottom: 1px solid var(--shell-200);
  display: block;
  color: inherit;
  text-decoration: none;
  transition:
    padding 300ms ease,
    background 300ms ease;
}
.s9-ref-link:hover {
  padding-left: 12px;
  padding-right: 12px;
  background: var(--shell-100);
}
.s9-ref-link:hover .s9-ref-name {
  color: var(--signal-indigo);
}
.s9-ref-name {
  transition: color 300ms ease;
}

.s9-ref-name {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
  font-variation-settings:
    "opsz" 48,
    "wght" 500;
}

.s9-ref-meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--shell-400);
  margin-top: 4px;
  letter-spacing: 0.02em;
  text-transform: lowercase;
}

.s9-quote {
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1.3;
  font-style: italic;
  margin-bottom: 24px;
  font-variation-settings:
    "opsz" 96,
    "wght" 400;
}

.s9-attr {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--shell-400);
  text-transform: uppercase;
}

.s9-industries {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 2.2;
  color: var(--shell-ink);
}

/* Slide 10 / 11 — who / not-for */
.s10-rows,
.s11-rows {
  margin-top: 56px;
  max-width: 1280px;
}

.s10-row {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 32px;
  padding: 28px 0;
  border-bottom: 1px solid var(--shell-200);
  align-items: start;
}

.s10-row:first-child {
  border-top: 1px solid var(--shell-200);
}

.s10-marker {
  width: 10px;
  height: 10px;
  margin-top: 8px;
  background: var(--shell-400);
}

.s10-row:nth-child(2) .s10-marker {
  opacity: 0.85;
}
.s10-row:nth-child(3) .s10-marker {
  opacity: 0.7;
}
.s10-row:nth-child(4) .s10-marker {
  opacity: 0.55;
}
.s10-row:nth-child(5) .s10-marker {
  opacity: 0.4;
}

.s10-row h3 {
  font-family: var(--mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
  color: var(--shell-ink);
}

.s10-row p {
  font-size: 18px;
  max-width: 90ch;
}

.s11-row {
  padding: 36px 0;
  border-top: 1px solid var(--shell-ink);
}

.s11-row h3 {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 500;
  margin-bottom: 10px;
  font-variation-settings:
    "opsz" 96,
    "wght" 500;
}

.s11-row p {
  font-size: 18px;
  color: var(--shell-400);
  max-width: 74ch;
}

/* Slide 12 — pricing */
.s12-table {
  margin-top: 56px;
  max-width: 1360px;
}

.s12-row {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 48px;
  padding: 28px 0;
  border-bottom: 1px solid var(--shell-200);
  align-items: baseline;
}

.s12-row.headline {
  border-bottom: 1px solid var(--shell-ink);
  padding-bottom: 32px;
}

.s12-row:first-child {
  border-top: 1px solid var(--shell-ink);
}

.s12-row h3 {
  font-family: var(--mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--shell-400);
  margin-bottom: 8px;
}

.s12-row p {
  font-size: 17px;
  max-width: 72ch;
}

.s12-price {
  font-family: var(--mono);
  font-size: 22px;
  text-align: right;
  color: var(--shell-ink);
  letter-spacing: -0.01em;
}

.s12-price.small {
  font-size: 16px;
}

/* Slide 13 — comparison matrix */
.s13-matrix-wrap {
  position: relative;
  margin-top: 40px;
  width: 100%;
  max-width: 1400px;
  height: 560px;
}

.s13-matrix-svg {
  width: 100%;
  height: 100%;
}

.s13-axis-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--shell-400);
  text-transform: uppercase;
}

.s13-legend {
  margin-top: 36px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px 48px;
  max-width: 1200px;
}

.s13-legend-item {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--shell-400);
  padding-left: 18px;
  position: relative;
  line-height: 1.5;
  letter-spacing: 0.02em;
  text-transform: none;
}

.s13-legend-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 8px;
  height: 8px;
  background: var(--shell-400);
}

.s13-legend-item.oa {
  color: var(--signal-indigo);
}

.s13-legend-item.oa::before {
  background: var(--signal-indigo);
}

/* Slide 14 — drift system */
.s14-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  margin-top: 40px;
}

.s14-questions {
  display: grid;
  gap: 0;
}

.s14-q {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--shell-200);
}

.s14-q:first-child {
  border-top: 1px solid var(--shell-200);
}

.s14-q-num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--shell-ink);
  letter-spacing: 0.04em;
}

.s14-q p {
  font-size: 17px;
  line-height: 1.5;
  max-width: 60ch;
}

.s14-cadence {
  padding-top: 8px;
}

.s14-cadence h3 {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--shell-400);
  margin-bottom: 16px;
}

.s14-cadence-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--shell-200);
}

.s14-cadence-label {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--shell-ink);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.s14-cadence-detail {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--shell-400);
  font-variation-settings:
    "opsz" 14,
    "wght" 400;
}

/* Slide 15 — year 1/2/3 */
.s15-years {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-top: 44px;
  position: relative;
}

.s15-timeline-svg {
  position: absolute;
  top: -18px;
  left: 0;
  width: 100%;
  height: 36px;
  pointer-events: none;
}

.s15-col {
  padding: 32px 0 0;
  border-top: 1px solid var(--shell-ink);
}

.s15-year {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--shell-ink);
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 500;
}

.s15-col h3 {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 500;
  line-height: 1.15;
  margin-bottom: 16px;
  font-variation-settings:
    "opsz" 96,
    "wght" 500;
}

.s15-col .mono {
  display: block;
  margin-bottom: 24px;
  text-transform: none;
  color: var(--shell-400);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.s15-col p {
  font-size: 16px;
  line-height: 1.55;
  color: var(--shell-ink);
}

/* Slide 16 — two-question qualifier */
.s16-wrap {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100%;
  gap: 40px;
}

.s16-questions {
  max-width: 1400px;
  margin-top: 32px;
}

.s16-q {
  padding: 28px 0;
  border-top: 1px solid var(--shell-200);
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  align-items: baseline;
}

.s16-q:last-of-type {
  border-bottom: 1px solid var(--shell-200);
}

.s16-q-num {
  font-family: var(--mono);
  font-size: 16px;
  color: var(--shell-ink);
}

.s16-q p {
  font-family: var(--serif);
  font-size: 40px;
  line-height: 1.2;
  font-weight: 400;
  letter-spacing: -0.01em;
  font-variation-settings:
    "opsz" 96,
    "wght" 400;
  max-width: 38ch;
}

.s16-response {
  margin-top: 40px;
  max-width: 900px;
}

.s16-response p {
  font-size: 17px;
  color: var(--shell-400);
  margin-bottom: 16px;
  max-width: 78ch;
}

.s16-contact {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--shell-ink);
  letter-spacing: 0.04em;
  margin-top: 48px;
}

/* Slide 17 — closing stamp */
.s17-wrap {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.s17-close {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 96px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  max-width: 22ch;
  color: var(--shell-ink);
  position: relative;
  padding-bottom: 32px;
  font-variation-settings:
    "opsz" 144,
    "wght" 400;
}

.s17-underline {
  width: 620px;
  height: 12px;
  margin: 0 auto;
  position: relative;
  top: -6px;
}

.s17-meta {
  margin-top: 72px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--shell-400);
  letter-spacing: 0.08em;
  line-height: 1.7;
  text-transform: uppercase;
}

/* Slide 18 — FAQ */
.s18-faq {
  margin-top: 40px;
  max-width: 1200px;
  columns: 2;
  column-gap: 72px;
  column-rule: 1px solid var(--shell-200);
}

.s18-item {
  break-inside: avoid;
  padding: 18px 0;
  border-bottom: 1px solid var(--shell-200);
}

.s18-item h3 {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--shell-ink);
  margin-bottom: 8px;
}

.s18-item p {
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--shell-400);
}

/* ==== Animation staging: elements start hidden ==== */
.anim-in {
  opacity: 0;
}

/* ==== Speaker notes panel ==== */
.notes-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 13, 15, 0.4);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease-out;
}

.notes-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.notes-panel {
  position: fixed;
  top: 64px;
  right: 64px;
  bottom: 64px;
  width: 520px;
  background: var(--shell-paper);
  color: var(--shell-ink);
  padding: 48px;
  box-shadow: -2px 0 0 var(--shell-ink);
  z-index: 101;
  transform: translateX(24px);
  opacity: 0;
  pointer-events: none;
  transition:
    transform 260ms cubic-bezier(0.19, 1, 0.22, 1),
    opacity 200ms ease-out;
  overflow-y: auto;
}

.notes-panel.open {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

.notes-panel .eyebrow {
  margin-bottom: 16px;
  display: block;
}

.notes-panel h2 {
  font-size: 28px;
  line-height: 1.2;
  margin-bottom: 20px;
  font-variation-settings:
    "opsz" 48,
    "wght" 500;
}

.notes-panel p {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
  color: var(--shell-ink);
  font-variation-settings:
    "opsz" 14,
    "wght" 400;
}

.notes-panel .close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--shell-400);
  text-transform: uppercase;
  cursor: pointer;
  padding: 6px 10px;
}

.notes-panel .close:hover {
  color: var(--shell-ink);
}

/* ==== Overview grid ==== */
.overview {
  position: fixed;
  inset: 0;
  background: var(--shell-paper);
  z-index: 200;
  padding: 48px 64px;
  display: none;
  overflow-y: auto;
}

.overview.open {
  display: block;
}

.overview-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 32px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--shell-ink);
}

.overview-head h2 {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
  font-variation-settings:
    "opsz" 48,
    "wght" 500;
}

.overview-head .meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--shell-400);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.thumb {
  position: relative;
  background: var(--shell-paper);
  border: 1px solid var(--shell-200);
  aspect-ratio: 16/9;
  cursor: pointer;
  padding: 12px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 160ms ease-out;
}

.thumb:hover {
  border-color: var(--shell-ink);
}

.thumb.active {
  border-color: var(--signal-indigo);
  border-width: 1px;
  box-shadow: inset 0 0 0 1px var(--signal-indigo);
}

.thumb-num {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--shell-400);
  letter-spacing: 0.08em;
}

.thumb-title {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.25;
  color: var(--shell-ink);
  font-weight: 500;
  font-variation-settings:
    "opsz" 48,
    "wght" 500;
}

/* ==== Viewport scaling (responsive) ==== */
@media (max-width: 1200px) {
  html {
    font-size: 16px;
  }
  .display,
  h1 {
    font-size: 64px;
  }
  .cover-title {
    font-size: 72px;
  }
  h2 {
    font-size: 40px;
  }
  .slide {
    padding: 64px 56px;
  }
  .s16-q p {
    font-size: 28px;
  }
  .s17-close {
    font-size: 60px;
  }
}

@media (max-width: 768px) {
  .s2-grid {
    grid-template-columns: 1fr;
  }
  .s2-wall {
    display: none;
  }
  .s4-columns {
    grid-template-columns: 1fr;
  }
  .s4-divider {
    display: none;
  }
  .s6-grid {
    grid-template-columns: 1fr;
  }
  .s9-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .s13-matrix-wrap {
    height: 360px;
  }
  .s13-legend {
    grid-template-columns: 1fr;
  }
  .s14-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .s15-years {
    grid-template-columns: 1fr;
  }
  .s18-faq {
    columns: 1;
  }
  .notes-panel {
    width: 90vw;
    left: 5vw;
    right: 5vw;
  }
  .overview-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cover-frame {
    inset: 36px;
  }
}

/* ==== Print ==== */
@media print {
  html,
  body {
    background: white;
    overflow: auto;
    height: auto;
    width: auto;
  }

  body {
    font-size: 14px;
  }

  .progress-bar,
  .notes-backdrop,
  .notes-panel,
  .overview {
    display: none !important;
  }

  .deck {
    width: auto;
    height: auto;
    overflow: visible;
  }

  .slide {
    position: static;
    display: block !important;
    opacity: 1 !important;
    width: 11in;
    height: 8.5in;
    padding: 0.75in;
    page-break-after: always;
    page-break-inside: avoid;
    break-after: page;
    overflow: hidden;
  }

  .slide .anim-in {
    opacity: 1 !important;
    transform: none !important;
  }

  .cover-title {
    font-size: 48px;
  }
  .display,
  h1 {
    font-size: 36px;
  }
  h2 {
    font-size: 24px;
  }
  p,
  .body {
    font-size: 13px;
  }
  .s16-q p {
    font-size: 22px;
  }
  .s17-close {
    font-size: 32px;
  }

  .speaker-notes-print {
    display: block !important;
    margin-top: 18px;
    padding-top: 12px;
    border-top: 1px solid var(--shell-400);
    font-size: 11px;
    line-height: 1.4;
    color: var(--shell-400);
    font-family: var(--sans);
  }

  .speaker-notes-print .label {
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--shell-ink);
    margin-bottom: 4px;
    display: block;
  }

  @page {
    size: 11in 8.5in landscape;
    margin: 0.5in;
  }
}

.speaker-notes-print {
  display: none;
}

/* ==== Reduced motion ==== */
@media (prefers-reduced-motion: reduce) {
  .anim-in {
    opacity: 1 !important;
    transform: none !important;
  }
  .progress-fill {
    transition: none;
  }
  .s7-art.indigo-dot::after {
    animation: none;
  }
}

/* ==== Focus ring ==== */
button:focus-visible,
.thumb:focus-visible {
  outline: 2px solid var(--signal-indigo);
  outline-offset: 2px;
}