@font-face{font-family:"LXGW WenKai";src:url("fonts/lxgw-wenkai-subset.woff2") format("woff2");font-display:swap}
@font-face{font-family:"Ma Shan Zheng";src:url("fonts/mashanzheng-subset.woff2") format("woff2");font-display:swap}
:root{--paper:#f4ede2;--card:#fdf9f2;--ink:#241c17;--ink-2:#56483d;--gold:#ab7d3c;--gold-2:#d9b483;--night:#0e0b0a;--pad:clamp(24px,4vw,64px);--serif:"LXGW WenKai",KaiTi,serif;--brush:"Ma Shan Zheng","LXGW WenKai",serif;--ease:cubic-bezier(.22,.7,.2,1);--display:clamp(64px,9vw,144px);--title:clamp(38px,5vw,76px);--body:20px;--small:16px;--micro:14px}
*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden;background:var(--paper);color:var(--ink);font-family:var(--serif);-webkit-font-smoothing:antialiased}h1,h2,h3,p,figure{margin:0}button{font:inherit;color:inherit;cursor:pointer;border:0;border-radius:0;background:none}button:active{transform:translateY(2px)}button:focus-visible,[role=button]:focus-visible{outline:3px solid var(--gold);outline-offset:5px}[hidden]{display:none!important}svg{display:block}.sprite{position:absolute;width:0;height:0;overflow:hidden}
/* A cover divided by a hard horizon. The image is from their own seven photographs. */
.intro{position:fixed;inset:0;z-index:80;background:var(--paper);overflow:hidden;transition:opacity .8s var(--ease),visibility .8s}.intro.is-out{opacity:0;visibility:hidden;pointer-events:none}.intro::before{content:"";position:absolute;inset:46% 0 0;background:var(--ink)}.intro-stage{position:absolute;inset:0}.beat{position:absolute;inset:0;padding:var(--pad);display:flex;flex-direction:column;justify-content:center;opacity:0;visibility:hidden;transform:translateY(25px);transition:opacity .65s var(--ease),transform .8s var(--ease),visibility .65s}.beat.is-on{opacity:1;visibility:visible;transform:none}.beat--landing{padding:0;display:block}.display{position:absolute;left:var(--pad);top:calc(46% - .86em);font-family:var(--brush);font-size:clamp(108px,15.2vw,240px);font-weight:400;line-height:.86;letter-spacing:-.04em;z-index:2}.display>[data-name]{display:block}.display [data-name]{margin-top:.12em;color:var(--paper)}.intro-sub,.start{position:absolute;left:var(--pad);z-index:2}.intro-sub{top:77%;font-size:var(--small);color:var(--gold-2)}.start{top:auto;bottom:var(--pad);left:24.5%;min-width:200px;min-height:56px;padding:14px 24px;background:transparent;color:var(--gold-2);font-size:var(--body);display:flex;align-items:center;justify-content:center;gap:20px;transform:translateX(-50%);transition:color .25s,transform .25s}.start::after{content:"→";transition:transform .25s}.start:active{transform:translate(-50%,2px)}@media(hover:hover){.start:hover{color:var(--paper)}.start:hover::after{transform:translateX(5px)}}.cover-image{position:absolute;left:49%;right:var(--pad);top:var(--pad);bottom:var(--pad);overflow:hidden;background:var(--ink)}.cover-image img{width:100%;height:100%;object-fit:cover;object-position:50% 52%;animation:shutter 1.15s var(--ease) both,photo-drift 24s ease-in-out 1.2s infinite alternate}.cover-image figcaption{display:none}.cover-image::after{content:"";position:absolute;inset:0;background:rgba(14,11,10,.1);pointer-events:none}.intro-hint{position:absolute;bottom:var(--pad);right:calc(var(--pad) + 20px);z-index:2;font-size:var(--micro);color:var(--paper)}.intro-hint.is-off{opacity:0}.intro:has(.beat:not(.beat--landing).is-on)::before{inset:0;background:var(--ink)}.intro:has(.beat:not(.beat--landing).is-on){color:var(--paper)}
.beat:not(.beat--landing){padding-inline:var(--pad);align-items:flex-start}.beat-big{font-family:var(--brush);font-size:var(--display);font-weight:400;line-height:1.1;letter-spacing:-.035em;max-width:11ch;text-wrap:balance}.beat-small{font-size:var(--body);margin-bottom:32px}.beat-big em{font-style:normal;color:inherit}.ch{display:inline-block}.is-on .ch{animation:letter-in .75s var(--ease) both;animation-delay:calc(var(--i)*35ms)}.beat--landing .ch{animation-delay:calc(var(--i)*45ms + 120ms)}.chat{max-width:760px}.chat-text{font-size:clamp(28px,4vw,48px);line-height:1.5}.caret{display:inline-block;background:var(--gold-2);width:3px;height:1em;vertical-align:middle;animation:blink 1s steps(1) infinite}.smiley{display:inline-block;width:.8em;height:.7em;vertical-align:baseline;margin-left:.16em;background:url('assets/smiley.png') center/contain no-repeat}
/* One complete letter within a fixed scene; only the paper scrolls on short screens. */
.story,.deck{position:fixed;inset:0;overflow:hidden}.slide{position:absolute;inset:0;padding:calc(var(--pad) + 35px) var(--pad) 100px;background:var(--paper);opacity:0;visibility:hidden;transform:translateY(7%);transition:opacity .65s var(--ease),transform .8s var(--ease),visibility .65s}.slide.is-active{opacity:1;visibility:visible;transform:none;z-index:2}.slide.is-leaving{opacity:0;transform:translateY(-5%);visibility:visible;z-index:1}.slide-inner{width:100%;height:100%;position:relative}.slide-title{font-family:var(--brush);font-size:var(--title);font-weight:400;line-height:1.05;letter-spacing:-.035em;text-wrap:balance}.slide-letter{background:var(--ink);color:var(--paper)}.slide-letter .slide-inner{display:flex;flex-direction:column;gap:32px;max-width:720px;margin-inline:auto}.slide-letter .slide-head{padding-top:0}.slide-letter .slide-title{max-width:none}.slide-letter .paper{height:auto;flex:1;max-width:none;min-height:0}.paper{width:100%;max-width:760px;display:flex;flex-direction:column;height:100%;min-height:0;padding:0 8px 4px 0;background:none;overflow:auto;overscroll-behavior:contain;touch-action:pan-y;scrollbar-width:thin;scrollbar-color:var(--ink-2) transparent}.paper-greet{font-size:var(--body);line-height:1.6;margin-bottom:20px;flex:none}.paper-body{font-size:var(--body);line-height:1.75;flex:none;overflow:visible}.paper-body p{margin:0 0 .8em}.paper-body p:last-child{margin-bottom:0}.paper-sign{font-size:var(--body);line-height:1.6;text-align:right;margin-top:20px;flex:none}.paper-sign time{display:block}.st{opacity:1}.is-active .slide-head{animation:enter .8s var(--ease) both}.is-active .paper-greet{animation:enter .8s 80ms var(--ease) both}.is-active .paper-body p{animation:enter .8s var(--ease) both;animation-delay:calc(var(--p,0)*70ms + 130ms)}.is-active .paper-sign{animation:enter .8s .3s var(--ease) both}
/* A hand of photographs: drag the stack, choose a memory, open it at full size. */
.slide-photos{background:var(--gold-2);color:var(--ink)}.slide-photos .slide-head{position:absolute;left:0;top:0;width:24%;z-index:2}.slide-photos .slide-title{font-size:clamp(28px,3vw,46px);max-width:5em;line-height:1.15}.photo-stage{position:absolute;inset:0;touch-action:pan-y;isolation:isolate}.photo-track{position:absolute;inset:0 0 92px;transform:translateX(var(--drag,0px));transition:transform .6s var(--ease)}.is-dragging .photo-track{transition:none;cursor:grabbing}.pf-card{position:absolute;left:50%;top:50%;margin:0;cursor:pointer;transition:opacity .65s var(--ease),transform .8s var(--ease);overflow:hidden;transform-origin:50% 70%;will-change:transform}.pf-card.is-active{cursor:zoom-in}.pf-shot,.pf-shot img{display:block;width:100%;height:100%}.pf-shot img{object-fit:cover;object-position:center}.pf-card--portrait .pf-shot img{object-position:50% 35%}.pf-card.is-off{pointer-events:none}.pf-controls{position:absolute;left:50%;bottom:0;width:min(580px,100%);transform:translateX(-50%);display:flex;gap:16px;align-items:center;z-index:6}.pf-dots{display:flex;flex:1;gap:8px;min-width:0;align-items:center}.pf-dot{height:56px;min-width:0;flex:1;padding:0;opacity:.45;overflow:hidden;transition:opacity .3s,transform .5s var(--ease);background:var(--night)}.pf-dot img{display:block;width:100%;height:100%;object-fit:cover}.pf-dot.is-on{opacity:1;transform:translateY(-8px)}.pf-dot:hover{opacity:1}.pf-arrow{width:44px;min-height:48px;flex:none;background:none;color:var(--ink);display:grid;place-items:center;transition:background .25s}.pf-arrow:hover{background:var(--paper)}.pf-arrow svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.5}
/* The final field is a real instrument: the cake, wind feedback and one primary action. */
.slide-cake{background:var(--night);color:var(--paper)}.slide-cake .slide-head{position:absolute;left:0;top:0;width:35%;z-index:1}.slide-cake .slide-title{max-width:6em}.cake-scene{position:absolute;width:min(56vw,76dvh);aspect-ratio:1760/1472;right:0;top:48%;transform:translateY(-50%);transition:transform .8s var(--ease);--wind:0}.cake-photo{display:block;width:100%;height:100%;object-fit:contain}.candles{position:absolute;inset:0;pointer-events:none}.candle{position:absolute;left:var(--x);top:var(--y);width:8%;transform:translate(-50%,-100%)}.candle svg{width:100%;overflow:visible}.flame-w{transform-box:fill-box;transform-origin:50% 100%;transform:skewX(calc(var(--wind)*38deg)) scaleY(calc(1 - var(--wind)*.45));transition:transform .1s linear}.flame{transform-box:fill-box;transform-origin:50% 100%;animation:flicker 1.3s ease-in-out infinite alternate}.candle:nth-child(2) .flame{animation-delay:-.6s}.candle:nth-child(3) .flame{animation-delay:-.9s}.candle.is-out .flame{opacity:0;animation:none;transform:scale(.2);transition:opacity .25s,transform .3s}.smoke circle{opacity:0;fill:var(--paper);transform-box:fill-box;transform-origin:center}.candle.is-out .smoke circle{animation:smoke 1.8s ease-out both}.candle.is-out .smoke circle:nth-child(2){animation-delay:.2s}.candle.is-out .smoke circle:nth-child(3){animation-delay:.4s}.cake-foot{position:absolute;left:0;bottom:0;width:36%;min-height:180px;display:grid;align-items:end}.blow-ui,.cake-done{grid-area:1/1}.blow-ui.listening .btn-main{background:var(--gold-2)}.blow-ui{display:flex;flex-direction:column;align-items:flex-start;gap:14px}.blow-ui.done{visibility:hidden;pointer-events:none}.btn-main{background:var(--paper);color:var(--ink);min-height:112px;width:100%;font-size:clamp(22px,2.2vw,32px);padding:18px;display:flex;align-items:center;justify-content:flex-start;gap:20px;transition:background .2s,transform .2s}.btn-main:hover{background:var(--gold-2)}.btn-main:disabled{opacity:.7;cursor:progress}.btn-ico{width:24px;height:24px;flex:none}#micLabel{text-align:left;line-height:1.35}.pulse{display:none}.blow-alternative{padding:8px 0;min-height:44px;color:var(--gold-2);font-size:var(--small);text-align:left}.blow-status{font-size:var(--micro);line-height:1.5;min-height:22px;color:var(--gold-2)}.cake-done{opacity:0;visibility:hidden;transform:translateY(20px);transition:opacity .6s,transform .6s;cursor:pointer}.cake-done.show{opacity:1;visibility:visible;transform:none}.cake-done .meta{display:none}.done-title{font-family:var(--brush);font-size:var(--title);font-weight:400;line-height:1.1}.done-note{font-size:var(--small);line-height:1.7;margin-top:20px}.done-note:empty{display:none}.reset-label{display:block;font-size:var(--small);color:var(--gold-2);margin-top:28px}.slide-cake:has(.cake-done.show) .slide-head{opacity:0;pointer-events:none}.slide-cake:has(.cake-done.show) .cake-foot{bottom:28%;width:40%}
/* Chapter controls share the same edges as every composition. */
.story-nav{position:fixed;left:var(--pad);right:var(--pad);bottom:max(22px,env(safe-area-inset-bottom));z-index:40;display:flex;align-items:center;justify-content:space-between;gap:20px}.story-nav button{min-height:44px;font-size:var(--small);padding:6px 0}.story-nav button:hover{color:var(--gold)}.story-nav button:disabled{opacity:.3;cursor:default}.tap-hint{display:none}body.is-intro .story-nav{visibility:hidden}body[data-chapter=letter] .story-nav,body[data-chapter=cake] .story-nav{color:var(--paper)}body[data-chapter=photos] .story-nav{color:var(--ink)}.story-nav button[hidden]{display:block!important;visibility:hidden}.music{position:fixed;right:var(--pad);top:var(--pad);z-index:88;width:44px;height:44px;display:grid;place-items:center;background:var(--paper);color:var(--ink);transition:transform .2s}.music svg{width:18px;height:18px}.music.playing svg{animation:music 5s linear infinite}
.lightbox{position:fixed;inset:0;z-index:90;background:var(--night);display:grid;place-items:center;padding:70px var(--pad);opacity:0;visibility:hidden;transition:opacity .35s,visibility .35s;color:var(--paper)}.lightbox.is-open{opacity:1;visibility:visible}.lb-figure{max-width:88vw;max-height:80dvh}.lb-figure img{display:block;max-height:80dvh;max-width:88vw;width:auto;height:auto}.lb-figure figcaption:empty{display:none}.lb-close,.lb-nav{position:absolute;width:48px;height:48px;display:grid;place-items:center;background:var(--paper);color:var(--ink)}.lb-close{right:var(--pad);top:var(--pad)}.lb-nav{bottom:20px}.lb-prev{left:var(--pad)}.lb-next{right:var(--pad)}.lb-nav svg,.lb-close svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.5}.lightbox.is-open~.music{visibility:hidden}
.fx,.grain,.intro-light,.sparks{display:none}@keyframes shutter{from{clip-path:inset(0 100% 0 0);transform:scale(1.1)}to{clip-path:inset(0);transform:scale(1)}}@keyframes photo-drift{from{transform:scale(1)}to{transform:scale(1.07)}}@keyframes letter-in{from{opacity:0;transform:translateY(30px) rotate(3deg)}to{opacity:1;transform:none}}@keyframes enter{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}@keyframes flicker{from{transform:scale(.94,1.04) rotate(-2deg)}to{transform:scale(1,.95) rotate(2deg)}}@keyframes smoke{0%{opacity:0;transform:translateY(0) scale(.5)}15%{opacity:.65}100%{opacity:0;transform:translateY(-65px) scale(2)}}@keyframes blink{50%{opacity:0}}@keyframes music{to{transform:rotate(360deg)}}
@media(max-width:760px){:root{--pad:24px;--body:18px;--display:clamp(44px,12vw,80px);--title:clamp(34px,10vw,54px);--small:16px;--micro:14px}.intro::before{inset:44% 0 0}.display{top:calc(44% - .86em);font-size:clamp(58px,18.5vw,100px);line-height:.82;left:var(--pad)}.display [data-name]{margin-top:.12em}.cover-image{left:42%;right:auto;top:50%;bottom:auto;width:calc(58% - var(--pad));aspect-ratio:4 / 5;transform:translateY(-50%)}.cover-image img{object-position:48% 38%}.intro-sub{top:85%;font-size:16px}.start{left:50%;bottom:max(24px,env(safe-area-inset-bottom));min-width:200px;font-size:18px;min-height:56px}.intro-hint{bottom:max(36px,env(safe-area-inset-bottom));right:var(--pad);font-size:13px;max-width:12em}.beat:not(.beat--landing){justify-content:center}.beat-big{max-width:11ch;line-height:1.15}.beat-small{font-size:18px;margin-bottom:24px}.chat-text{font-size:26px}.slide{padding:calc(var(--pad) + 32px) var(--pad) 91px}.slide-letter{padding-top:32px;padding-bottom:82px}.slide-letter .slide-inner{display:flex;flex-direction:column;gap:14px}.slide-letter .slide-head{padding:0}.slide-letter .slide-title{max-width:none}.paper{height:auto;flex:1;min-height:0;max-width:560px;align-self:center;padding-right:2px}.paper-greet{font-size:16px;line-height:1.6;margin-bottom:16px}.paper-body{font-size:16px;line-height:1.65}.paper-sign{font-size:16px;margin-top:16px}.slide-photos .slide-head{width:100%;position:relative}.slide-photos .slide-title{font-family:var(--serif);font-size:18px;max-width:none;line-height:1.4}.photo-stage{top:0;bottom:0}.photo-track{inset:0 0 84px}.pf-controls{width:100%;bottom:0;gap:6px}.pf-dots{display:flex;flex:1;gap:5px;margin:0;min-width:0}.pf-dot{height:46px;min-height:44px;min-width:0;flex:1}.pf-dot.is-on{transform:translateY(-8px)}.pf-arrow{width:28px;min-height:48px;flex:none}.pf-arrow:hover{background:var(--paper)}.slide-cake .slide-head{width:100%;top:4%}.slide-cake .slide-title{font-size:clamp(32px,9vw,44px);max-width:8em;line-height:1.15}.cake-scene{width:100%;max-width:58dvh;right:50%;top:46%;transform:translate(50%,-50%)}.cake-foot{left:0;bottom:0;width:100%;min-height:120px}.blow-ui{gap:6px;width:100%}.btn-main{min-height:64px;font-size:22px;padding:14px 18px}.blow-alternative{font-size:14px;min-height:40px;padding:6px 0}.blow-status{font-size:14px}.slide-cake:has(.cake-done.show) .slide-head{opacity:1}.slide-cake:has(.cake-done.show) .cake-foot{bottom:0;width:100%;min-height:125px}.done-title{font-size:32px;line-height:1.1}.reset-label{font-size:14px;margin-top:20px}.story-nav{gap:14px;bottom:max(14px,env(safe-area-inset-bottom))}.story-nav button{font-size:14px}.music{width:40px;height:40px}.lb-figure,.lb-figure img{max-width:calc(100vw - 32px)}}
@media(max-height:650px){.slide{padding-top:44px;padding-bottom:76px}.slide-letter{padding-top:24px;padding-bottom:72px}.paper{height:100%}.slide-letter .slide-inner{gap:18px}.paper-greet,.paper-sign{font-size:16px;line-height:1.5;margin-block:10px}.paper-body{font-size:16px;line-height:1.65}.slide-title{font-size:32px}.cake-scene{max-width:48dvh;top:42%}.cake-foot{min-height:100px}.blow-status{min-height:0}.slide-cake .slide-head{top:0}.intro-sub{top:83%}.intro-hint{max-width:10em;font-size:12px}}
/* The music control follows each scene without covering the photograph in a tile. */
.music{background:transparent}
body[data-chapter=letter] .music,body[data-chapter=cake] .music{color:var(--paper)}
body.is-intro .music{color:var(--ink)}
body.is-intro:has(.beat:not(.beat--landing).is-on) .music{color:var(--paper)}
@media(min-width:761px){body.is-intro .music{color:var(--paper)}}
.music:hover{transform:scale(1.08)}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.ch{opacity:1;transform:none}.cover-image img{transform:none}.flame-w{transform:none}}