:root {
  --paper: #f8fbfd;
  --sky: #e6f1f8;
  --blue: #255da2;
  --deep: #173d64;
  --ink: #16354e;
  --muted: #526d80;
  --line: #c9dbe7;
  --serif: "Songti SC", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", sans-serif;
  --edge: 8.5vw;
}
* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { background: var(--paper); color: var(--ink); font: 400 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
button { color: inherit; font: inherit; cursor: pointer; touch-action: manipulation; }
button:focus-visible { outline: 3px solid var(--blue); outline-offset: 4px; }
button:disabled { opacity: .3; cursor: default; }
h1, h2, p { margin: 0; }
.backdrop { width: 100%; height: 100vh; height: 100dvh; position: relative; overflow: hidden; isolation: isolate; touch-action: pan-y; }
.scenery { position: absolute; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.scenery-image { width: 100%; height: 100%; position: absolute; inset: 0; object-fit: cover; object-position: 60% center; }
.city { opacity: 1; transition: opacity 800ms cubic-bezier(.2,.6,.2,1); }
.garden { opacity: 0; object-position: center; transition: opacity 800ms cubic-bezier(.2,.6,.2,1); }
.scenery-wash { position: absolute; inset: 0; background: linear-gradient(180deg,rgba(248,251,253,.22),rgba(248,251,253,.38) 48%,rgba(248,251,253,.06)); }
.flowing-veil { position: absolute; inset: 0; overflow: hidden; }
#fog-canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; }
.fog-ready #fog-canvas { opacity: 1; }
.fog-ready .flowing-veil { display: none; }
.veil { position: absolute; width: 180%; height: 145%; left: -40%; top: -25%; background: radial-gradient(ellipse 36% 26% at 50% 56%,rgba(248,251,253,.32),rgba(248,251,253,.13) 52%,transparent 75%); filter: blur(28px); animation: veil-flow 22s cubic-bezier(.4,0,.6,1) infinite alternate; }
.veil-two { background: radial-gradient(ellipse 31% 24% at 62% 42%,rgba(248,251,253,.23),rgba(230,241,248,.08) 52%,transparent 76%); animation-name: veil-return; animation-duration: 28s; animation-delay: -14s; }
.veil-three { top: 30%; height: 90%; background: radial-gradient(ellipse 45% 19% at 45% 62%,rgba(248,251,253,.22),transparent 74%); animation-duration: 32s; animation-delay: -21s; }
.event-brand { position: absolute; z-index: 3; top: 7.2%; left: 50%; transform: translateX(-50%); display: flex; align-items: center; gap: clamp(12px,1vw,22px); }
.event-brand > img { width: clamp(44px,4.2vw,84px); height: clamp(44px,4.2vw,84px); object-fit: contain; border-radius: 50%; }
.brand-wordmark { font: 600 clamp(20px,1.85vw,38px)/1.4 var(--serif); white-space: nowrap; text-align: center; }
.brand-wordmark small { display: block; margin-top: 5px; color: var(--muted); font: 400 clamp(7px,.65vw,13px)/1.5 var(--sans); letter-spacing: .13em; }
.slide { position: absolute; inset: 0; opacity: 0; transform: translateX(22px); transition: opacity 280ms cubic-bezier(.2,.7,.2,1), transform 280ms cubic-bezier(.2,.7,.2,1); pointer-events: none; }
.slide.is-active { opacity: 1; transform: translateX(0); pointer-events: auto; }
.backdrop.is-reversing .slide:not(.is-active) { transform: translateX(-22px); }
.theme-content { position: absolute; top: 32%; left: var(--edge); right: var(--edge); text-align: center; }
.programme { color: var(--deep); font-size: clamp(14px,1.25vw,25px); font-weight: 500; letter-spacing: .1em; margin-bottom: 30px; }
h1 { font-weight: 700; font-family: var(--serif); line-height: 1.3; letter-spacing: .025em; }
h1 span { display: block; }
.title-primary { font-size: clamp(44px,5.7vw,116px); }
.title-secondary { margin-top: 14px; font-size: clamp(31px,4.0vw,82px); }
.edition { margin-top: 28px; color: var(--blue); font-size: clamp(17px,1.6vw,32px); letter-spacing: .18em; }
.organizers { position: absolute; bottom: 13%; left: var(--edge); right: var(--edge); color: var(--ink); font-size: clamp(14px,1.3vw,26px); font-weight: 600; line-height: 1.85; text-align: center; }
.organizers::before { content: ""; display: block; height: 1px; background: var(--line); width: min(540px,34vw); margin: 0 auto 20px; }
.organizers p { display: flex; align-items: baseline; justify-content: center; gap: 24px; }
.organizers p > span { flex-shrink: 0; color: var(--deep); letter-spacing: .18em; }
.cue-content { position: absolute; inset: 29% var(--edge) 24%; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.event-context { color: var(--deep); font-size: clamp(16px,1.65vw,34px); font-weight: 500; letter-spacing: .08em; text-align: center; text-wrap: balance; }
.event-context span { white-space: nowrap; }
.cue-content h2 { margin-top: 32px; font: 700 clamp(70px,10.2vw,204px)/1.35 var(--serif); letter-spacing: .2em; padding-left: .2em; white-space: nowrap; }
.cue-edition { margin-top: 32px; color: var(--blue); font-size: clamp(15px,1.45vw,29px); letter-spacing: .24em; }
.cue-edition::before { content: ""; display: block; width: 48px; height: 1px; background: #7e9fbc; margin: 0 auto 24px; }
.backdrop[data-page="4"] .garden { opacity: 1; }
.backdrop[data-page="4"] .city { opacity: 0; }
.backdrop[data-page="4"] .scenery-wash { background: linear-gradient(180deg,rgba(248,251,253,.28),rgba(248,251,253,.48) 44%,rgba(248,251,253,.12)); }
.break-slide .cue-content { inset-block: 26% 28%; }
.presentation-controls { position: absolute; z-index: 5; left: 50%; bottom: max(18px,env(safe-area-inset-bottom)); transform: translate(-50%,0); display: flex; align-items: center; gap: 10px; padding: 8px 12px; border: 1px solid var(--line); background: rgba(248,251,253,.96); transition: opacity 240ms cubic-bezier(.2,.7,.2,1), transform 240ms cubic-bezier(.2,.7,.2,1); white-space: nowrap; }
.presentation-controls button { background: none; border: 0; min-width: 44px; min-height: 44px; padding: 8px 10px; }
.presentation-controls button:hover { background: var(--sky); }
.presentation-controls button:active { background: #d6e8f4; transform: translateY(1px); }
.icon-button { display: grid; place-items: center; }
.presentation-controls svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: square; stroke-linejoin: miter; }
.slide-navigation { display: flex; align-items: center; gap: 6px; }
.slide-navigation button { font-size: 13px; border-bottom: 2px solid transparent; color: var(--muted); }
.slide-navigation button > span { font-size: 10px; margin-right: 6px; }
.slide-navigation button[aria-current="page"] { color: var(--blue); border-bottom-color: var(--blue); }
.control-divider { width: 1px; height: 22px; background: var(--line); margin: 0 4px; }
.utility-button { display: inline-flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }
.play-icon { display: none; }
.is-paused .pause-icon { display: none; }
.is-paused .play-icon { display: block; }
.is-paused .veil, .is-away .veil { animation-play-state: paused; }
.is-idle { cursor: none; }
.is-idle .presentation-controls:not(:focus-within) { opacity: 0; transform: translate(-50%,10px); pointer-events: none; }
.presentation-notice { position: absolute; z-index: 6; bottom: 100px; left: 50%; transform: translateX(-50%); color: var(--deep); background: var(--paper); font-size: 14px; padding: 10px 18px; border: 1px solid var(--line); opacity: 0; pointer-events: none; }
.presentation-notice:not(:empty) { opacity: 1; }
.no-script { position: absolute; bottom: 20px; left: var(--edge); color: var(--muted); font-size: 14px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@keyframes veil-flow { from { transform: translate3d(-14%,-3%,0) rotate(-5deg); } to { transform: translate3d(15%,6%,0) rotate(5deg); } }
@keyframes veil-return { from { transform: translate3d(13%,7%,0) rotate(4deg); } to { transform: translate3d(-12%,-5%,0) rotate(-6deg); } }
@media (max-width: 1000px) {
  .presentation-controls { gap: 4px; padding: 6px; }
  .slide-navigation { gap: 0; }
  .slide-navigation button { padding-inline: 8px; }
  .slide-navigation button > span { display: none; }
  .utility-button > span { display: none; }
  .control-divider { margin-inline: 2px; }
}
@media (max-width: 680px) {
  :root { --edge: 7vw; }
  .event-brand { top: 6%; }
  .event-brand > img { width: 44px; height: 44px; }
  .brand-wordmark { font-size: 20px; }
  .brand-wordmark small { font-size: 7px; letter-spacing: .05em; margin-top: 3px; }
  .theme-content { top: 29%; right: var(--edge); }
  .programme { font-size: 12px; letter-spacing: .02em; margin-bottom: 24px; }
  .title-primary { font-size: clamp(38px,10.8vw,64px); }
  .title-secondary { font-size: clamp(25px,6.9vw,44px); margin-top: 12px; white-space: nowrap; }
  .edition { margin-top: 24px; font-size: 18px; }
  .organizers { bottom: 21%; font-size: 13px; line-height: 1.9; }
  .organizers p { gap: 14px; }
  .organizers::before { width: 48vw; margin-bottom: 16px; }
  .cue-content { inset: 29% var(--edge) 29%; }
  .event-context { font-size: 16px; letter-spacing: .025em; }
  .event-context > span { display: block; }
  .cue-content h2 { font-size: clamp(52px,13vw,82px); margin-top: 30px; letter-spacing: .14em; padding-left: .14em; }
  .cue-edition { font-size: 16px; margin-top: 28px; letter-spacing: .16em; }
  .presentation-controls { display: grid; grid-template-columns: 44px minmax(0,1fr) 44px; grid-template-rows: auto auto; width: 340px; max-width: 96vw; gap: 2px 4px; padding: 6px; bottom: max(12px,env(safe-area-inset-bottom)); }
  .presentation-controls button { min-width: 44px; padding: 7px; }
  .slide-navigation { grid-column: 1 / -1; grid-row: 1; justify-content: stretch; }
  .slide-navigation button { flex: 1; font-size: 12px; min-width: 0; padding-inline: 5px; }
  .slide-navigation button > span { display: none; }
  #previous-slide { grid-column: 1; grid-row: 2; }
  #next-slide { grid-column: 3; grid-row: 2; }
  #motion-toggle { grid-column: 2; grid-row: 2; justify-self: start; }
  #fullscreen-toggle { grid-column: 2; grid-row: 2; justify-self: end; }
  .utility-button > span { display: inline; }
  .control-divider { display: none; }
  .presentation-controls svg { width: 18px; height: 18px; }
}
@media (max-height: 570px) and (min-width: 570px) {
  .event-brand { top: 6%; }
  .event-brand > img { width: 42px; height: 42px; }
  .brand-wordmark { font-size: 21px; }
  .brand-wordmark small { font-size: 7px; }
  .theme-content { top: 26%; }
  .programme { font-size: 12px; margin-bottom: 12px; }
  .title-primary { font-size: 8.5vh; }
  .title-secondary { font-size: 6.5vh; margin-top: 5px; }
  .edition { font-size: 16px; margin-top: 10px; }
  .organizers { bottom: 19%; font-size: 11px; line-height: 1.6; }
  .organizers::before { margin-bottom: 8px; }
  .cue-content { inset-block: 28% 23%; }
  .event-context { font-size: 15px; }
  .cue-content h2 { font-size: 19vh; margin-top: 12px; }
  .cue-edition { margin-top: 12px; font-size: 14px; }
  .cue-edition::before { margin-bottom: 10px; }
  .presentation-controls { display: flex; width: max-content; max-width: 96vw; gap: 4px; padding: 6px; }
  .slide-navigation button { flex: initial; font-size: 12px; }
  .utility-button > span { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .slide, .city, .garden, .scenery-wash, .presentation-controls { transition: none; }
}