/* Deck: a fixed canvas scaled to fit the window, one slide at a time.
   Colours, fonts and sizes come from theme.css. */

:root {
  --canvas-w: 1600;
  --canvas-h: 900;
  --scale: 1; /* set by deck.js */
}

@media screen and (max-aspect-ratio: 3/4) {
  :root {
    --canvas-w: 640;
    --canvas-h: 1200;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: var(--backdrop);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: var(--fs-body);
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, p, ol, ul, dl, dd { margin: 0; padding: 0; }
ol, ul { list-style: none; }
a { color: inherit; }
h1, h2, h3 { text-wrap: balance; }
.nowrap { white-space: nowrap; }
p, li, dd { text-wrap: pretty; }

/* Canvas */

.deck {
  position: absolute;
  top: 50%;
  left: 50%;
  width: calc(var(--canvas-w) * 1px);
  height: calc(var(--canvas-h) * 1px);
  transform: translate(-50%, -50%) scale(var(--scale));
  background: var(--paper);
  overflow: hidden;
  touch-action: pan-y pinch-zoom;
}

/* Slides */

.slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: var(--pad-y) var(--pad-x) calc(var(--pad-y) + var(--gap-m));
  opacity: 0;
  visibility: hidden;
}

.slide.is-active {
  opacity: 1;
  visibility: visible;
}

/* Motion. deck.js adds .is-ready once the canvas is fitted, and tags each slide's pieces
   with .reveal and their order in --i. The leaving slide fades out quickly; the arriving
   one fades in while its pieces rise into place one after another. */
.deck.is-ready .slide {
  transition:
    opacity var(--dur-out) var(--ease),
    visibility 0s linear var(--dur-out);
}

.deck.is-ready .slide.is-active {
  transition:
    opacity var(--dur-in) var(--ease),
    visibility 0s;
}

.deck.is-ready .reveal {
  opacity: 0;
  transform: translateY(var(--rise));
  transition:
    opacity var(--dur-out) var(--ease),
    transform var(--dur-out) var(--ease);
}

.deck.is-ready .slide.is-active .reveal {
  opacity: 1;
  transform: none;
  transition:
    opacity var(--dur-reveal) var(--ease),
    transform var(--dur-reveal) var(--ease);
  transition-delay: calc(var(--delay-in) + var(--i, 0) * var(--stagger));
}

/* Theme switch: a cross-fade of the whole page where the browser supports view transitions */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: var(--dur-theme);
  animation-timing-function: var(--ease);
}

/* Shared type */

.kicker,
.eyebrow {
  margin-bottom: var(--gap-s);
  font-size: var(--fs-small);
  font-weight: var(--weight-strong);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--accent);
}

.title {
  margin-bottom: var(--gap-l);
  font-family: var(--font-display);
  font-size: var(--fs-title);
  font-weight: var(--weight-display);
  letter-spacing: var(--tracking-display);
  line-height: 1.05;
}

.statement {
  max-width: 17ch;
  font-family: var(--font-display);
  font-size: var(--fs-statement);
  font-weight: var(--weight-display);
  letter-spacing: var(--tracking-display);
  line-height: 1.08;
}

h3 {
  font-size: var(--fs-lead);
  font-weight: var(--weight-strong);
  line-height: 1.15;
}

/* 01 · Cover */

.s-cover { justify-content: center; }

.mark {
  position: absolute;
  top: var(--pad-y);
  left: var(--pad-x);
  width: 52px;
  height: 52px;
}

.mark__top { fill: var(--mark-top); }
.mark__right { fill: var(--mark-right); }
.mark__left { fill: var(--mark-left); }

.cover-name {
  margin-bottom: var(--gap-m);
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: var(--weight-display);
  letter-spacing: var(--tracking-display);
  line-height: 0.95;
}

.s-cover .lead {
  max-width: 32ch;
  font-size: var(--fs-lead);
  line-height: 1.25;
  color: var(--ink-soft);
}

.cover-meta {
  margin-top: var(--gap-l);
  color: var(--ink-muted);
}

.hint {
  position: absolute;
  top: var(--pad-y);
  right: var(--pad-x);
  font-size: var(--fs-small);
  color: var(--ink-muted);
}

.hint__touch { display: none; }

@media (hover: none) and (pointer: coarse) {
  .hint__keys { display: none; }
  .hint__touch { display: inline; }
}

/* Statement */

.s-statement { justify-content: center; }

.statement-sub {
  max-width: 34ch;
  margin-top: var(--gap-m);
  font-size: var(--fs-lead);
  line-height: 1.3;
  color: var(--ink-soft);
}

.aside {
  margin-top: var(--gap-xl);
  color: var(--ink-muted);
}

/* Columns: numbered points side by side */

.columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-l);
  margin-top: auto;
  counter-reset: point;
}

.columns li {
  padding-top: var(--gap-m);
  border-top: var(--rule-w) solid var(--rule);
  counter-increment: point;
}

.columns li::before {
  content: counter(point, decimal-leading-zero);
  display: block;
  margin-bottom: var(--gap-m);
  font-size: var(--fs-small);
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.columns p {
  margin-top: var(--gap-s);
  color: var(--ink-soft);
}

/* Numbers */

.figures {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-l) var(--gap-l);
  margin-top: auto;
}

.figures div {
  padding-top: var(--gap-s);
  border-top: var(--rule-w) solid var(--rule);
}

.figures dt {
  font-family: var(--font-display);
  font-size: var(--fs-figure);
  letter-spacing: var(--tracking-display);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.figures dd {
  max-width: 24ch;
  color: var(--ink-soft);
}

/* Story: one short paragraph, outcomes on the side */

.story {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--gap-xl);
  align-items: end;
  margin-top: auto;
}

.story > p {
  max-width: 30ch;
  font-size: var(--fs-lead);
  line-height: 1.3;
}

.outcomes li {
  padding: var(--gap-s) 0;
  border-top: var(--rule-w) solid var(--rule);
  color: var(--ink-soft);
}

.outcomes strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-figure);
  font-weight: var(--weight-display);
  letter-spacing: var(--tracking-display);
  line-height: 1.1;
  color: var(--ink);
}

/* Lines: a short list read out one by one */

.lines { margin-top: auto; }

.lines li {
  padding: var(--gap-m) 0;
  border-bottom: var(--rule-w) solid var(--rule);
  font-size: var(--fs-lead);
  line-height: 1.25;
}

.lines li:first-child { border-top: var(--rule-w) solid var(--rule); }

/* Timeline */

.timeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--gap-m);
  margin-top: auto;
}

.timeline li {
  position: relative;
  padding-top: var(--gap-m);
  border-top: var(--rule-w) solid var(--rule);
}

.timeline li::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline li:last-child::before {
  background: var(--accent-2);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent-2) 22%, transparent);
}

.timeline .year {
  display: block;
  margin-bottom: var(--gap-s);
  font-size: var(--fs-small);
  font-variant-numeric: tabular-nums;
  letter-spacing: var(--tracking-caps);
  color: var(--ink-muted);
}

.timeline h3 { font-size: var(--fs-body); }

.timeline p {
  margin-top: 8px;
  font-size: var(--fs-small);
  line-height: 1.4;
  color: var(--ink-soft);
}

/* Tools */

.tools { margin-top: auto; }

.tools div {
  display: grid;
  grid-template-columns: 220px 1fr;
  align-items: baseline;
  padding: var(--gap-m) 0;
  border-bottom: var(--rule-w) solid var(--rule);
}

.tools div:first-child { border-top: var(--rule-w) solid var(--rule); }

.tools dt {
  font-size: var(--fs-small);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--ink-muted);
}

.tools dd { font-size: var(--fs-lead); line-height: 1.25; }

/* Contact */

.s-close { justify-content: center; }

.contact {
  margin-top: var(--gap-xl);
  font-size: var(--fs-lead);
  line-height: 1.6;
}

.contact a {
  text-decoration: none;
  border-bottom: var(--rule-w) solid var(--rule);
  transition: border-color 150ms;
}

.contact a:hover,
.contact a:focus-visible {
  border-color: var(--accent);
  outline: none;
}

/* Footer and controls */

.deck-footer {
  position: absolute;
  right: var(--pad-x);
  bottom: var(--pad-foot);
  left: var(--pad-x);
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-small);
  color: var(--ink-muted);
}

.deck.at-start .deck-footer__name { visibility: hidden; }

.deck-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.deck-nav button {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  color: inherit;
  cursor: pointer;
}

.deck-nav svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.deck-nav button {
  transition: color 200ms var(--ease), background-color 200ms var(--ease);
}

.deck-nav button:not(:disabled):hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--ink) 7%, transparent);
}

.theme-toggle { margin-right: 16px; }
.icon-moon { display: none; }
:root[data-theme="light"] .icon-sun { display: none; }
:root[data-theme="light"] .icon-moon { display: block; }
.deck-nav button:disabled { opacity: 0.3; cursor: default; }
.deck-nav button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.deck-count {
  min-width: 4.5em;
  text-align: center;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.deck-count__sep { margin: 0 0.4em; opacity: 0.5; }

.progress {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: var(--progress-h);
  background: var(--rule);
}

.progress__bar {
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
}

.deck.is-ready .progress__bar { transition: transform var(--dur-reveal) var(--ease); }

/* Portrait canvas: stack everything */

@media screen and (max-aspect-ratio: 3/4) {
  .mark { position: static; order: -2; width: 44px; height: 44px; margin-bottom: var(--gap-m); }
  .hint { position: static; order: -1; margin-bottom: auto; }
  .columns,
  .story { grid-template-columns: 1fr; gap: var(--gap-m); }
  .columns li::before { margin-bottom: var(--gap-s); }
  .figures { grid-template-columns: repeat(2, 1fr); gap: var(--gap-m); }
  .timeline { grid-template-columns: 1fr; gap: var(--gap-s); }
  .timeline li { padding: 0 0 0 var(--gap-m); border-top: 0; border-left: var(--rule-w) solid var(--rule); }
  .timeline li::before { top: 8px; left: -6px; }
  .tools div { grid-template-columns: 1fr; gap: 4px; }
}

/* Reduced motion: keep a short fade, drop the movement */
@media (prefers-reduced-motion: reduce) {
  :root {
    --rise: 0px;
    --stagger: 0ms;
    --delay-in: 0ms;
    --dur-in: 200ms;
    --dur-reveal: 200ms;
  }
}

/* Print / Save as PDF: one slide per page */

@media print {
  @page { size: 1600px 900px; margin: 0; }

  html, body { height: auto; overflow: visible; }

  body {
    background: var(--paper);
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .deck {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    transform: none;
  }

  .slide,
  .deck.is-ready .slide {
    position: relative;
    width: 1600px;
    height: 900px;
    opacity: 1;
    visibility: visible;
    transition: none;
    break-after: page;
  }

  .deck.is-ready .slide .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .deck-footer,
  .progress,
  .hint { display: none; }
}