:root{--paper:#f4f0e7;--ink:#252a29;--muted:#626860;--accent:#425d50;--line:#252a2926;--panel:#e6e9df;color-scheme:light;font-family:Arial,'Microsoft YaHei','PingFang SC',sans-serif;font-synthesis:none}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--paper);color:var(--ink);line-height:1.8}
a{color:inherit}
button,input{font:inherit}
button{cursor:pointer;color:inherit}
img{max-width:100%;height:auto}
button,a{touch-action:manipulation}
:focus-visible{outline:3px solid var(--accent);outline-offset:5px}
p{margin:0 0 1em}
h1,h2,h3{line-height:1.3;margin:0 0 .7em}
h1{letter-spacing:-.045em;font-size:clamp(46px,6vw,84px);font-weight:500}
h2{font-size:clamp(28px,3.4vw,44px);letter-spacing:-.035em;font-weight:500}
h3{font-size:23px;font-weight:500}
.serif{font-family:Georgia,'Songti SC',SimSun,serif}
.wrap{width:min(1180px,calc(100% - 96px));margin:auto}
.skip{position:fixed;left:12px;top:-90px;z-index:100;background:var(--paper);padding:12px}
.skip:focus{top:8px}
.top{display:flex;gap:24px;align-items:center;justify-content:space-between;padding:22px 0;border-bottom:1px solid var(--line);font-size:12px}
.top a{text-decoration:none}
.top nav{display:flex;gap:24px}
.mark{display:flex;align-items:center;gap:10px;letter-spacing:2px}
.mark i{display:block;width:13px;height:13px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 5px color-mix(in srgb,var(--accent) 16%,transparent)}
.eyebrow{font-size:11px;letter-spacing:2.6px;font-weight:500;color:var(--accent);margin-bottom:22px}
.intro{font-size:18px;line-height:1.9}
.status{font-size:12px;display:flex;flex-wrap:wrap;gap:10px 23px;color:var(--muted);margin:22px 0}
.status span:before{content:'•';margin-right:8px;color:var(--accent)}
.hero{padding:78px 0 65px}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero p{max-width:610px}
.hero-title-note{font-size:15px;color:var(--muted);margin-top:26px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0}
.button{border:1px solid var(--line);padding:11px 21px;background:transparent;border-radius:3px;text-decoration:none;font-size:14px;display:inline-flex;align-items:center;justify-content:center;gap:12px}
.button.primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.button[aria-pressed=true]{background:var(--accent);color:var(--paper)}
.button:hover{border-color:var(--accent)}
.arrow-link{text-underline-offset:5px}
.chapter{padding:75px 0;border-top:1px solid var(--line)}
.chapter-intro{display:grid;grid-template-columns:1fr 1fr;gap:60px;margin-bottom:40px}
.chapter-intro p{max-width:530px;color:var(--muted)}
.decisions{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin:45px 0 5px}
.decisions article{border-top:1px solid var(--line);padding-top:18px}
.decisions b{display:block;color:var(--accent);font:17px Georgia,serif;margin-bottom:22px}
.decisions h3{font-size:21px}
.decisions p{font-size:15px;color:var(--muted)}
.screen{margin:0}
.screen button{padding:0;border:0;display:block;width:100%;background:none}
.screen img{width:100%;display:block;border:1px solid var(--line)}
.screen figcaption{color:var(--muted);font-size:12px;margin-top:12px;line-height:1.8;display:flex;justify-content:space-between;gap:20px}
.gallery{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.gallery .screen img{aspect-ratio:1.5;object-fit:cover;object-position:top}
.demo-label{font-size:11px;letter-spacing:1.5px;color:var(--muted);margin-bottom:24px}
.demo{background:var(--panel);padding:40px;border:1px solid var(--line)}
.demo-output{font-size:17px;min-height:64px;line-height:1.8}
.demo small{font-size:12px;color:var(--muted)}
.demo .controls{display:flex;gap:9px;flex-wrap:wrap;margin:20px 0 0}
.evolution{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin-top:34px}
.evolution article{border-left:1px solid var(--accent);padding:0 0 0 20px}
.evolution h3{font-size:19px}
.evolution p{color:var(--muted);font-size:14px}
.evolution small{display:block;font-size:11px;color:var(--accent);letter-spacing:1.5px;margin-bottom:12px}
.boundary{padding:30px 0 0;max-width:850px;font-size:14px;color:var(--muted)}
.case-footer{padding:35px 0 55px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:24px;font-size:14px}
.case-footer a{text-decoration:none}
.case-footer strong{font-weight:500;font-size:20px;display:block;margin:6px 0}
.lightbox{width:min(1450px,96vw);max-height:94dvh;padding:12px;background:var(--paper);border:1px solid var(--line);color:var(--ink)}
.lightbox::backdrop{background:#111d}
.lightbox img{display:block;width:100%;height:auto}
.lightbox button{position:sticky;top:0;display:block;margin:0 0 10px auto;padding:7px 18px;background:var(--ink);color:var(--paper);border:0}
.lightbox p{margin:10px;font-size:13px}

.knowledge{--paper:#edf1f4;--ink:#243644;--muted:#4b6070;--accent:#3d7296;--panel:#dde6ed}
.cabinet{padding:30px;background:#273b4d;box-shadow:15px 18px 0 #bbcedb;transform:rotate(2deg)}
.cabinet-label{display:block;color:#dce6eb;font:12px Georgia,serif;letter-spacing:3px;margin:5px 0 25px}
.drawer{display:flex;align-items:center;justify-content:space-between;padding:22px;background:#f5f0e4;border-bottom:5px solid #273b4d;font-size:15px}
.drawer i{height:6px;width:40px;border:1px solid #b7a88b;background:#d1c5b0}
.drawer:nth-child(3){transform:translateX(-15px);box-shadow:8px 12px 18px #0003}
.filing-demo{display:grid;grid-template-columns:1fr 1.4fr;gap:45px;align-items:center}
.paper-slip{background:#fffdf7;padding:28px;box-shadow:8px 8px 0 #b8c8d0;transform:rotate(-3deg)}
.paper-slip h3{font-family:Georgia,serif}
.paper-slip .file-line{border-bottom:1px solid #ddd;padding:10px 0;font-size:13px}
.step-track{font-size:13px;word-spacing:12px;color:var(--accent);margin-bottom:20px}

.record{--paper:#f4f0e6;--ink:#232320;--muted:#666459;--accent:#b33e1c;--panel:#e8e1d1}
.record h1{font-size:clamp(52px,6.5vw,94px);font-weight:700}
.record h1 em{font-style:normal;color:var(--accent)}
.record-object{aspect-ratio:1;position:relative;background:#d5e2cf;display:grid;place-items:center;border:1px solid #3332;transform:rotate(3deg)}
.record-object:before{content:'ON RECORD / SIDE A';position:absolute;top:20px;left:22px;font-size:12px;letter-spacing:2px}
.vinyl{width:76%;aspect-ratio:1;border-radius:50%;background:repeating-radial-gradient(circle,#24251f 0 2px,#34352f 3px 4px);display:grid;place-items:center;box-shadow:5px 12px 22px #0004}
.vinyl span{width:37%;aspect-ratio:1;display:grid;place-items:center;background:#d9552e;border-radius:50%;font:48px Georgia,serif;color:#eadcca}
.turntable-demo{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.mini-vinyl{width:min(280px,90%);margin:auto}
.mini-vinyl span{font-size:28px}
.track-title{font-size:32px}
.track-range{width:100%;accent-color:var(--accent);margin:20px 0}
.track-index{letter-spacing:3px;font-size:12px}
.comparison{border-collapse:collapse;width:100%;margin-top:30px;font-size:14px}
.comparison th,.comparison td{text-align:left;border-bottom:1px solid var(--line);padding:14px 9px}
.comparison th{font-weight:500;color:var(--muted)}

.reading{--paper:#f5f3e9;--ink:#304337;--muted:#596552;--accent:#54704a;--panel:#e6eadc}
.reading h1{font-family:Georgia,'Songti SC',SimSun,serif;font-size:clamp(60px,7vw,100px);letter-spacing:.12em}
.specimen{background:#e4e9d9;border:1px solid #aab69f;min-height:360px;display:grid;place-content:center;position:relative;border-radius:50% 50% 0 0}
.plant{position:relative;height:240px;width:220px;margin:auto}
.plant:before{content:'';position:absolute;bottom:15px;left:50%;width:2px;height:175px;background:#506d45;transform:rotate(5deg)}
.leaf{position:absolute;width:75px;height:37px;border-radius:0 100% 0 100%;background:#789264;bottom:95px;left:42px;transform:rotate(30deg)}
.leaf:nth-child(2){left:114px;bottom:140px;transform:rotate(-80deg);background:#9eae84}
.leaf:nth-child(3){left:60px;bottom:170px;transform:rotate(30deg);width:48px;height:25px}
.plant:after{content:'✳';position:absolute;left:99px;top:-19px;color:#b86850;font-size:69px}
.specimen-tag{font-size:12px;letter-spacing:3px;text-align:center}
.stage-demo{display:grid;grid-template-columns:1fr 1.3fr;gap:45px;align-items:center}
.stage-demo .plant{transform:scale(.8)}
.stage-demo[data-stage="0"] .plant{opacity:.35}
.stage-demo[data-stage="1"] .plant:after{color:transparent}
.stage-word{font:40px Georgia,'Songti SC',SimSun,serif;display:block;margin:8px 0 20px}
.note-paper{padding:30px;background:#fffcf2;box-shadow:4px 6px 0 #c6ccb9;transform:rotate(-1deg)}

.film{--paper:#141e2b;--ink:#e9e3d6;--muted:#a9b1bc;--accent:#e1b267;--panel:#1d2a3a;--line:#e9e3d62b;color-scheme:dark}
.film .hero h1{font-family:Georgia,'Songti SC',SimSun,serif}
.film .hero-grid{grid-template-columns:1.1fr 1fr}
.ticket{background:#ede5cf;color:#283445;padding:35px;transform:rotate(-5deg);border-left:10px dotted var(--paper);border-right:10px dotted var(--paper);box-shadow:18px 20px 0 #09131c}
.ticket small{letter-spacing:3px;font-size:10px}
.ticket strong{font-size:36px;display:block;margin:25px 0;font-weight:500}
.ticket .tear{border-top:1px dashed #47526066;padding-top:18px;display:flex;justify-content:space-between;font:13px Georgia,serif}
.rewatch-demo{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.rewatch-note{border-top:1px solid var(--accent);padding-top:25px}
.rewatch-note output{font-family:Georgia,'Songti SC',SimSun,serif;font-size:25px;line-height:1.8}
.ticket-year{font:60px Georgia,serif;color:var(--accent)}

.travel{--paper:#f3eddd;--ink:#344e40;--muted:#536650;--accent:#43664d;--panel:#dfe5cf}
.travel .hero h1{font-family:Georgia,'Songti SC',SimSun,serif;letter-spacing:.02em}
.travel-window{height:340px;border:16px solid #bca276;border-bottom-width:29px;border-radius:140px 140px 12px 12px;overflow:hidden;background:#9acadc;position:relative;box-shadow:0 0 0 2px #726946}
.travel-window img{height:100%;width:160%;max-width:none;object-fit:cover;animation:passing 25s linear infinite alternate;display:block}
.travel-window.paused img{animation-play-state:paused}
.travel-window span{position:absolute;bottom:16px;left:18px;background:#fff4db;padding:4px 12px;font-size:11px}
.scene-demo{background:#dfe5cf;padding:35px}
.scene-demo .travel-window{height:370px;border-radius:120px 120px 10px 10px}
.scene-controls{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px;margin-top:28px}
.scene-controls .controls{margin:0}
.scene-title{font:26px Georgia,'Songti SC',SimSun,serif;margin-top:25px}
@keyframes passing{from{transform:translateX(0)}
to{transform:translateX(-30%)}
}

@media(max-width:900px){.wrap{width:calc(100% - 48px)}
.hero-grid{gap:35px}
.decisions{gap:25px}
.chapter-intro{gap:30px}
.hero{padding-top:55px}
.cabinet{padding:18px}
.drawer{padding:18px}
.travel-window{height:300px}
}

@media(max-width:700px){.wrap{width:calc(100% - 36px)}
.top{font-size:11px;gap:12px;padding:19px 0}
.top nav{gap:16px}
.top nav .optional{display:none}
.mark{letter-spacing:1px}
.hero{padding:48px 0}
.hero-grid,.film .hero-grid,.chapter-intro,.filing-demo,.turntable-demo,.stage-demo,.rewatch-demo{grid-template-columns:1fr;gap:34px}
.hero .intro{font-size:16px}
.hero-grid>div:nth-child(2){max-width:470px;width:100%;margin:0 auto}
.chapter{padding:48px 0}
.chapter-intro{gap:6px;margin-bottom:28px}
.chapter-intro p{font-size:15px}
.decisions,.evolution{grid-template-columns:1fr;gap:26px}
.decisions b{margin-bottom:12px}
.gallery{grid-template-columns:1fr}
.demo{padding:23px}
.demo-output{font-size:16px}
.cabinet{margin:0 12px 16px 2px;box-shadow:10px 12px 0 #bbcedb}
.record-object{margin:5px 10px;width:calc(100% - 20px)!important}
.screen figcaption{display:block}
.screen figcaption span{display:block}
.screen figcaption span:last-child{margin-top:5px}
.knowledge .hero-grid{gap:46px}
.specimen{min-height:310px}
.stage-demo .plant{height:205px}
.film .ticket{margin:5px 12px;box-shadow:10px 12px 0 #09131c}
.travel-window{height:270px}
.scene-demo{padding:18px}
.scene-demo .travel-window{height:260px;border-width:9px;border-bottom-width:18px}
.comparison{font-size:12px}
.comparison th,.comparison td{padding:10px 4px}
.case-footer strong{font-size:16px}
.case-footer{font-size:11px}
.lightbox{padding:7px}
}

@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
*,*:before,*:after{animation:none!important;transition:none!important}
}


/* A deliberate Play click may override the system default for this preview only. */
@media(prefers-reduced-motion:reduce){.travel-window.user-motion img{animation:passing 25s linear infinite alternate!important}
.travel-window.user-motion.paused img{animation-play-state:paused!important}
}