:root{--font-editorial:"Songti SC","STSong","Noto Serif CJK SC","Times New Roman",serif;font-family:var(--font-editorial);color:#d4d4ce;background:#04070c;font-synthesis:none}*{box-sizing:border-box}body{margin:0;overflow:hidden;cursor:default}#world,#world canvas,#loading-particles{cursor:default}#world,#world canvas{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}#world{opacity:0;transition:opacity 1.2s}.ready #world{opacity:1}.signature{position:fixed;z-index:6;top:clamp(24px,4vw,48px);left:clamp(24px,4vw,52px);display:flex;align-items:baseline;gap:9px;pointer-events:none;color:#e0e2dda6;text-shadow:0 1px 18px #0008;font-weight:400}.signature-city{font-family:var(--font-editorial);font-size:17px;letter-spacing:3px}.dot{font-size:11px;opacity:.55;margin:0 3px}.signature-author{font-family:var(--font-editorial);font-size:15px;font-style:normal;letter-spacing:.6px}#status{position:fixed;top:48%;width:100%;text-align:center;font-size:10px;letter-spacing:4px;color:#c5cdd18c}[hidden]{display:none!important}@media(max-width:600px){.signature{gap:5px}.signature-city{font-size:14px;letter-spacing:2px}.signature-author{font-size:12px}}@media(prefers-reduced-motion:reduce){#world{transition:none}}
/* A small architectural colophon; the centre of the image remains open. */
.editorial-frame{position:fixed;inset:0;z-index:4;pointer-events:none;--ink:#c7bf9f;--caption-opacity:0;--frame-opacity:.36;--reveal:0}
.frame-rule{position:absolute;left:clamp(24px,4vw,52px);top:85px;width:126px;height:1px;background:linear-gradient(90deg,#d5c9ab80,transparent);opacity:var(--frame-opacity)}
.scene-caption{position:absolute;left:clamp(24px,4vw,52px);bottom:clamp(35px,6vh,66px);display:grid;grid-template-columns:25px auto 86px;gap:18px;align-items:center;max-width:calc(100vw - 70px);opacity:var(--caption-opacity);color:var(--ink);text-shadow:0 1px 16px #000}
.scene-caption:before{content:"";position:absolute;z-index:-1;inset:-35px -48px -32px -45px;background:radial-gradient(ellipse at 35% 65%,#03060db8,transparent 73%)}
.caption-kicker{font:400 9px/1.5 var(--font-editorial);letter-spacing:3px;color:var(--ink);opacity:.8;white-space:nowrap}
.scene-caption h1{font:400 clamp(24px,2.7vw,36px)/1.5 var(--font-editorial);letter-spacing:3px;color:#e6e4db;margin:9px 0 8px;white-space:normal;text-wrap:balance;max-width:540px}.scene-caption h1 span{display:inline-block;will-change:transform,opacity,filter}
.scene-caption p{font:400 10px/1.9 var(--font-editorial);letter-spacing:1.5px;color:#c3c6c3b5;margin:0}

.sound-toggle{position:fixed;z-index:7;top:clamp(22px,4vw,43px);right:clamp(22px,4vw,52px);display:flex;align-items:center;gap:10px;border:1px solid #e0dbcf1c;border-radius:30px;background:#080d165c;color:#c5c6c2ad;padding:9px 12px;cursor:pointer;font:10px/1.2 var(--font-editorial);letter-spacing:1px;opacity:0;transition:opacity .6s,background .3s}.ready .sound-toggle{opacity:1}.sound-toggle:hover{background:#1a253185;color:#e8e4d9}.sound-toggle:focus-visible{outline:1px solid #c4c6bc;outline-offset:4px}.sound-bars{display:flex;align-items:center;gap:2px;height:13px}.sound-bars i{display:block;width:1px;height:3px;background:currentColor}.sound-bars i:nth-child(2){height:10px}.sound-bars i:nth-child(3){height:6px}.sound-bars i:nth-child(4){height:12px}.sound-toggle[data-playing="true"] .sound-bars i{animation:sound-breathe 1.4s ease-in-out infinite alternate}.sound-bars i:nth-child(2){animation-delay:-.7s!important}.sound-bars i:nth-child(3){animation-delay:-.3s!important}.sound-bars i:nth-child(4){animation-delay:-1s!important}.sound-toggle[data-on="true"] .sound-label{display:none}@keyframes sound-breathe{to{transform:scaleY(.3)}}
@media(max-width:600px){.frame-rule{top:69px;width:87px}.scene-caption{left:22px;right:22px;bottom:34px;max-width:none;grid-template-columns:17px minmax(0,1fr);gap:12px}.scene-caption h1{font-size:25px;letter-spacing:2px}.caption-kicker{font-size:8px;letter-spacing:1.5px}.scene-caption p{font-size:9px;letter-spacing:.7px}.architecture-mark{display:none}.sound-toggle{top:64px;right:20px;padding:8px 10px}.sound-label{font-size:9px}.folio{font-size:14px}.caption-seal{font-size:9px}}
@media(prefers-reduced-motion:reduce){.sound-bars i{animation:none!important}.scene-caption h1 span{will-change:auto}.sound-toggle{transition:none}}
/* Free-floating light grains around a fixed Beijing loading title. */
.loading-screen{position:fixed;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;background:radial-gradient(ellipse at 48% 46%,#152021 0%,#0a1216 40%,#04090e 85%);opacity:1;visibility:visible;transition:opacity 1s ease,visibility 0s 1s;pointer-events:none}
#loading-particles{position:absolute;inset:0;width:100%;height:100%}.loading-poem{position:absolute;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;align-items:center;gap:14px;color:#dfd2bbaa;font-family:var(--font-editorial)}.loading-poem>span{font-size:28px;letter-spacing:12px;padding-left:12px}.loading-poem>i{width:20px;height:1px;background:#d1b99455}.loading-poem>small{font-size:10px;letter-spacing:5px;padding-left:5px;opacity:.52}
.loading-screen #status{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;top:auto}
body:not(.ready) .signature{opacity:0}.signature{transition:opacity 1.2s ease}.ready .loading-screen{opacity:0;visibility:hidden}
.load-error .loading-screen{opacity:1;visibility:visible;transition:none}.load-error .loading-poem{display:none}.load-error .loading-screen #status{position:absolute;top:65%;clip-path:none;white-space:normal;width:auto;height:auto;margin:24px 20px 0;font-size:11px;line-height:1.8;letter-spacing:2px}
@media(prefers-reduced-motion:reduce){.loading-screen,.signature{transition:none}}
.loading-poem>span{font-size:clamp(24px,4vw,30px);letter-spacing:7px;padding-left:7px;white-space:nowrap}.loading-progress{--loaded:0;position:relative;width:184px;height:30px;margin-top:8px}.loading-track{position:absolute;left:0;right:0;bottom:0;height:1px;background:#bcc3bc26}.loading-track i{display:block;width:100%;height:1px;background:#c9b590;transform:scaleX(var(--loaded));transform-origin:left;transition:transform .65s ease}.loading-gate{position:absolute;width:24px;height:24px;bottom:1px;left:calc(var(--loaded)*100%);transform:translateX(-50%);stroke:#c9b590;stroke-width:.8;fill:none;transition:left .65s ease;opacity:.82}.load-error .loading-progress{display:none}@media(prefers-reduced-motion:reduce){.loading-track i,.loading-gate{transition:none}}
.prelude-caption{position:fixed;z-index:5;left:clamp(25px,4vw,52px);bottom:clamp(35px,6vh,65px);pointer-events:none;text-shadow:0 2px 16px #000;max-width:calc(100vw - 50px)}.prelude-caption small{font:9px/1.5 var(--font-editorial);letter-spacing:2.8px;color:#c1bdabb3}.prelude-caption h1{font:400 clamp(24px,2.7vw,36px)/1.5 var(--font-editorial);letter-spacing:5px;color:#e3dfd3;margin:9px 0}.prelude-caption p{font:400 10px/1.8 var(--font-editorial);letter-spacing:2px;color:#bbc0b8b5;margin:0}@media(max-width:600px){.prelude-caption small{font-size:8px;letter-spacing:1.6px}.prelude-caption h1{font-size:25px}}
/* Text-only scene captions: no side illustrations, seal or geometric baseline. */
.scene-caption{display:block;max-width:calc(100vw - 70px)}.scene-caption h1{margin-bottom:13px}@media(max-width:600px){.scene-caption{max-width:calc(100vw - 44px)}}

/* One type family across signature, captions, loading and controls. */
.signature-author{font-weight:400}.caption-kicker{text-transform:uppercase}.loading-poem>small,#status,.sound-toggle{font-weight:400}.prelude-caption h1{letter-spacing:3px}.prelude-caption p{line-height:1.9;letter-spacing:1.5px}

/* Minimal loading: a single centred progress line, no artwork or label. */
.loading-screen{background:#04090e}.loading-poem{inset:50% auto auto 50%;transform:translate(-50%,-50%);gap:0}.loading-progress{width:min(184px,50vw);height:2px;margin:0}.loading-track{height:2px}.loading-track i{height:2px}