*{box-sizing:border-box;margin:0;padding:0}
html,body{width:100%;height:100%;background:#05060a;color:#e8ecf5;overflow:hidden;font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,sans-serif}
#stage{position:fixed;inset:0;overflow:hidden;background:radial-gradient(ellipse at 50% 45%,#121a2c 0%,#070910 60%,#030407 100%)}
canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
#cvFar{filter:blur(2.6px) brightness(.8);opacity:0}
#cvNear{opacity:0}
#heat{mix-blend-mode:normal;opacity:0}
#heatGlow{filter:blur(14px) saturate(1.4);mix-blend-mode:screen;opacity:0}
.layer{position:absolute;inset:0;pointer-events:none}
.hidden{display:none!important}

/* ---------- chapter 1: 3D glass slide ---------- */
#s1{perspective:1400px;perspective-origin:50% 45%;opacity:0}
#cam3d{position:absolute;left:50%;top:48%;width:0;height:0;transform-style:preserve-3d}
#glass{position:absolute;width:960px;height:320px;left:-480px;top:-160px;border-radius:10px;
  background:linear-gradient(115deg,rgba(210,230,255,.16),rgba(160,190,230,.06) 40%,rgba(220,235,255,.13));
  border:1px solid rgba(200,225,255,.35);box-shadow:0 0 0 1px rgba(255,255,255,.05) inset,0 0 60px rgba(90,140,255,.18);transform-style:preserve-3d}
#label{position:absolute;left:0;top:0;width:250px;height:100%;border-radius:10px 0 0 10px;
  background:repeating-linear-gradient(45deg,rgba(255,255,255,.10) 0 2px,rgba(255,255,255,.04) 2px 5px),linear-gradient(#d8dde6,#bfc6d2);
  color:#1a2233;padding:28px 22px;opacity:.92}
#label .lb1{font:700 26px/1.2 ui-monospace,Consolas,monospace;letter-spacing:.5px}
#label .lb2{font:500 16px/1.6 ui-monospace,Consolas,monospace;margin-top:6px}
#label .lb3{font-size:16px;margin-top:22px;opacity:.75}
#tissueWrap{position:absolute;left:540px;top:100px;height:119px;width:97px}
/* real scale: 7.6 x 9.3 mm tissue crop on a 75 x 25 mm slide at 12.8 px/mm */
#tissueWrap img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain}
#tisBlur{filter:blur(3px) saturate(.3) brightness(.7);opacity:.75}
#tisSharp{clip-path:inset(0 100% 0 0);filter:drop-shadow(0 0 10px rgba(255,120,200,.35))}
#scanbar{position:absolute;top:-30px;bottom:-30px;width:3px;left:0;background:#bfe3ff;box-shadow:0 0 18px 6px rgba(120,190,255,.75),0 0 60px 18px rgba(80,140,255,.35);opacity:0}
#glassSheen{position:absolute;inset:0;border-radius:10px;background:linear-gradient(100deg,transparent 30%,rgba(255,255,255,.12) 45%,transparent 60%);background-size:250% 100%;mix-blend-mode:screen}
#glassShadow{position:absolute;width:900px;height:120px;left:-450px;top:200px;background:radial-gradient(ellipse,rgba(70,110,255,.22),transparent 70%);filter:blur(20px);transform:rotateX(80deg)}
#scanHud{position:absolute;left:50%;top:13%;transform:translateX(-50%);font:500 clamp(13px,1.2vw,18px)/1 ui-monospace,Consolas,monospace;color:#9fd0ff;letter-spacing:2px;opacity:0;text-shadow:0 0 12px rgba(100,170,255,.8)}

/* depth of field: blurred edges via backdrop filter with radial mask */
#dof{position:absolute;inset:0;pointer-events:none;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);
  -webkit-mask-image:radial-gradient(ellipse 46% 44% at 50% 50%,transparent 55%,#000 100%);mask-image:radial-gradient(ellipse 46% 44% at 50% 50%,transparent 55%,#000 100%);opacity:0}

/* ---------- HUD ---------- */
#scale{position:absolute;left:4vw;bottom:19vh;opacity:0;transition:opacity .6s}
#scaleBar{height:4px;background:#fff;box-shadow:0 0 10px rgba(160,210,255,.9);border-radius:2px}
#scaleTxt{font:600 clamp(13px,1.1vw,17px)/1.6 ui-monospace,Consolas,monospace;color:#dceaff;text-shadow:0 1px 3px #000}
#zoomInfo{position:absolute;right:4vw;bottom:19vh;text-align:right;font:500 clamp(12px,1vw,15px)/1.6 ui-monospace,Consolas,monospace;color:#bcd2f0;opacity:0;transition:opacity .6s;text-shadow:0 1px 3px #000}
#zoomInfo b{color:#fff;font-size:1.35em}
.callout{position:absolute;transform:translate(-50%,-50%);pointer-events:none;opacity:0;transition:opacity .7s}
.callout .ring{position:absolute;left:50%;top:50%;border:2px solid rgba(255,255,255,.9);border-radius:50%;transform:translate(-50%,-50%);box-shadow:0 0 14px rgba(140,200,255,.9),inset 0 0 14px rgba(140,200,255,.5)}
.callout .tx{position:absolute;white-space:nowrap;font-size:clamp(15px,1.4vw,22px);font-weight:700;color:#fff;text-shadow:0 0 12px rgba(80,150,255,.9),0 2px 4px #000;background:rgba(5,10,25,.55);padding:4px 12px;border-radius:6px;border:1px solid rgba(150,200,255,.4)}
#counter{position:absolute;left:4vw;top:14vh;opacity:0;transition:opacity .6s}
#counter .row{display:flex;align-items:baseline;gap:14px;margin-bottom:10px}
#counter .n{font:800 clamp(30px,3.6vw,56px)/1 ui-monospace,Consolas,monospace;color:#fff;text-shadow:0 0 20px rgba(110,180,255,.8)}
#counter .n.tum{color:#7ff0ff;text-shadow:0 0 22px rgba(60,230,255,.9)}
#counter .l{font-size:clamp(14px,1.3vw,20px);color:#b8c8e6}
#counter .sub{font-size:clamp(12px,1vw,15px);color:#8fa3c4;max-width:30vw;line-height:1.5}
#normPanel{position:absolute;right:3.5vw;top:14vh;width:min(30vw,420px);opacity:0;transition:opacity .8s}
#normPanel h3{font-size:clamp(14px,1.25vw,19px);color:#dfe9ff;margin-bottom:10px;font-weight:600}
#normPanel .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
#normPanel .cell{position:relative;aspect-ratio:1;border-radius:6px;overflow:hidden;box-shadow:0 0 0 1px rgba(160,210,255,.35),0 0 18px rgba(80,150,255,.35)}
#normPanel .cell img{position:absolute;inset:0;width:100%;height:100%;transition:opacity 1.2s}
#normPanel .cap{display:flex;justify-content:space-between;font-size:clamp(12px,1vw,15px);color:#9fb3d6;margin-top:8px}
#legend{position:absolute;right:4vw;top:14vh;opacity:0;transition:opacity .8s;font-size:clamp(12px,1.05vw,16px);color:#d5e1f7;background:rgba(6,10,22,.55);padding:12px 16px;border-radius:10px;border:1px solid rgba(140,180,255,.25)}
#legend .cb{width:min(22vw,300px);height:12px;border-radius:6px;background:linear-gradient(90deg,#3d7bff,#9fc0ff 30%,#eeeef4 50%,#ff9a7a 70%,#ff3a2e);box-shadow:0 0 12px rgba(255,120,100,.4);margin:8px 0 4px}
#legend .ends{display:flex;justify-content:space-between;color:#a9b9d6}
#legend .item{display:flex;align-items:center;gap:8px;margin:4px 0}
#legend .sw{width:14px;height:14px;border-radius:3px;display:inline-block}

#split{position:absolute;inset:0;opacity:0;transition:opacity .9s}
.case{position:absolute;bottom:20vh;width:40vw;text-align:center}
.case.l{left:5vw}.case.r{right:5vw}
.case .cid{font:600 clamp(13px,1.15vw,18px)/1.4 ui-monospace,Consolas,monospace;color:#b9c9e6}
.case .score{font:800 clamp(36px,4.6vw,72px)/1.1 ui-monospace,Consolas,monospace;margin:4px 0}
.case .bar{height:10px;width:70%;margin:6px auto;border-radius:5px;background:rgba(255,255,255,.12);position:relative;overflow:hidden}
.case .bar i{position:absolute;left:0;top:0;bottom:0;border-radius:5px}
.case .truth{display:inline-block;margin-top:8px;padding:5px 14px;border-radius:999px;font-size:clamp(13px,1.15vw,18px);font-weight:700}
.case .tsub{font-size:clamp(11px,.9vw,14px);color:#8ea2c4;margin-top:6px}
.case .lbl{font-size:clamp(12px,1vw,15px);color:#9fb3d6}
#table4{position:absolute;left:50%;top:9.5vh;transform:translateX(-50%);width:min(56vw,760px);opacity:0;transition:opacity .9s;background:rgba(6,10,22,.72);border:1px solid rgba(140,180,255,.3);border-radius:12px;padding:12px 18px;box-shadow:0 0 40px rgba(60,100,220,.25)}
#table4 h4{font-size:clamp(13px,1.1vw,17px);color:#dfe9ff;font-weight:600;margin-bottom:6px}
#table4 .axis{position:relative;height:72px;margin:4px 6px 2px}
#table4 .line{position:absolute;left:0;right:0;top:30px;height:2px;background:rgba(200,215,255,.35)}
#table4 .tick{position:absolute;top:36px;font:11px ui-monospace,Consolas,monospace;color:#8ea2c4;transform:translateX(-50%)}
#table4 .dot{position:absolute;top:22px;width:18px;height:18px;border-radius:50%;transform:translateX(-50%);border:2px solid #fff}
#table4 .dl{position:absolute;top:0;transform:translateX(-50%);font:600 11px ui-monospace,Consolas,monospace;white-space:nowrap}
#table4 .note{font-size:clamp(11px,.85vw,13px);color:#8ea2c4}
#finale{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;opacity:0;transition:opacity 1.2s;text-align:center;padding-bottom:14vh}
#finale .big{font-size:clamp(34px,5vw,80px);font-weight:800;letter-spacing:.08em;background:linear-gradient(90deg,#8fd3ff,#ffffff 45%,#ffb38f);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 22px rgba(120,180,255,.55))}
#finale .mid{font-size:clamp(15px,1.5vw,24px);color:#cfdcf5;margin-top:18px}
#finale .chips{display:flex;gap:14px;margin-top:22px;flex-wrap:wrap;justify-content:center}
#finale .chip{padding:8px 18px;border-radius:999px;border:1px solid rgba(160,200,255,.45);background:rgba(20,35,70,.55);font-size:clamp(13px,1.2vw,19px);box-shadow:0 0 16px rgba(80,140,255,.3)}
#finale .src{margin-top:26px;background:rgba(4,6,14,.78);padding:10px 16px;border-radius:8px;font-size:clamp(11px,.85vw,13px);color:#8193b3;max-width:74vw;line-height:1.6}

/* ---------- cinematic overlays ---------- */
.vignette{position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse at 50% 50%,transparent 52%,rgba(0,0,0,.72) 100%)}
.grain{position:absolute;inset:-40px;pointer-events:none;opacity:.07;mix-blend-mode:overlay;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .5 0 0 0 0 .5 0 0 0 0 .5 0 0 0 1.2 -.1'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");animation:grain .9s steps(6) infinite}
@keyframes grain{0%{transform:translate(0,0)}20%{transform:translate(-14px,9px)}40%{transform:translate(11px,-17px)}60%{transform:translate(-7px,15px)}80%{transform:translate(17px,4px)}100%{transform:translate(0,0)}}
.letter{position:absolute;left:0;right:0;height:5.5vh;background:#000;pointer-events:none;z-index:5}
.letter.top{top:0}.letter.bot{bottom:0}

#topbar{position:absolute;left:0;right:0;top:0;height:5.5vh;display:flex;align-items:center;justify-content:space-between;padding:0 2.2vw;z-index:6;font-size:clamp(12px,1vw,15px)}
#brand{color:#cfe0ff;font-weight:700;letter-spacing:.04em}
#brand span{color:#7f8fae;font-weight:400}
#chapName{color:#9fd0ff;font-weight:600;letter-spacing:.06em}
#subs{position:absolute;left:8vw;right:8vw;bottom:9vh;text-align:center;z-index:6;font-size:clamp(18px,2vw,32px);line-height:1.45;font-weight:600;color:#fff;text-shadow:0 0 6px #000,0 2px 10px #000,0 0 22px rgba(0,0,0,.8);min-height:2.9em;display:flex;align-items:flex-end;justify-content:center}
#subs span{background:rgba(0,0,0,.35);padding:2px 14px;border-radius:6px;transition:opacity .25s}
#progress{position:absolute;left:2.2vw;right:2.2vw;bottom:2vh;height:2.2vh;display:flex;gap:6px;z-index:7;align-items:center}
#progress .seg{flex:1;height:5px;background:rgba(255,255,255,.14);border-radius:3px;position:relative;cursor:pointer;overflow:visible}
#progress .seg i{position:absolute;left:0;top:0;bottom:0;background:linear-gradient(90deg,#5aa8ff,#bfe3ff);border-radius:3px;box-shadow:0 0 8px rgba(110,180,255,.9)}
#progress .seg em{position:absolute;bottom:9px;left:0;font-style:normal;font-size:11px;color:#8193b3;white-space:nowrap}
#progress .seg.on em{color:#cfe3ff}
#help{position:absolute;right:2.2vw;top:6.4vh;font-size:11px;color:#56647e;z-index:7}

#intro{position:absolute;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;background:radial-gradient(ellipse at 50% 40%,rgba(20,30,60,.85),rgba(2,3,8,.97));transition:opacity 1s}
.introInner{text-align:center;max-width:860px;padding:20px}
.kicker{color:#7fc2ff;letter-spacing:.3em;font-size:clamp(12px,1.1vw,16px);margin-bottom:18px}
#intro h1{font-size:clamp(40px,6vw,92px);line-height:1.1;font-weight:800;background:linear-gradient(90deg,#9fd8ff,#fff 50%,#ffb59a);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 26px rgba(100,160,255,.5))}
#intro p{margin-top:22px;color:#b9c7e2;font-size:clamp(14px,1.3vw,20px);line-height:1.7}
#startBtn{margin-top:34px;font-size:clamp(18px,1.8vw,26px);padding:14px 46px;border-radius:999px;border:1px solid rgba(170,210,255,.7);background:linear-gradient(180deg,rgba(60,110,230,.55),rgba(25,50,120,.55));color:#fff;cursor:pointer;box-shadow:0 0 30px rgba(80,140,255,.55);font-family:inherit;font-weight:700;letter-spacing:.1em}
#startBtn:hover{box-shadow:0 0 46px rgba(110,170,255,.9)}
#intro .small{margin-top:22px;color:#6f7f9d;font-size:13px}
#sources{position:absolute;inset:0;z-index:30;background:rgba(2,4,10,.86);display:flex;align-items:center;justify-content:center}
.srcInner{max-width:min(980px,92vw);max-height:84vh;overflow:auto;background:#0b1222;border:1px solid rgba(140,180,255,.3);border-radius:14px;padding:22px 28px;font-size:14px;line-height:1.65;color:#cdd8ee}
.srcInner h2{font-size:20px;margin-bottom:10px;display:flex;justify-content:space-between}
.srcInner h2 button{background:none;border:1px solid #4a5a7a;color:#ccd;border-radius:6px;padding:0 10px;cursor:pointer}
.srcInner h3{font-size:15px;color:#9fd0ff;margin:12px 0 4px}
.srcInner li{margin-left:20px}
.srcInner table{border-collapse:collapse;margin:6px 0;font-size:13px}
.srcInner td,.srcInner th{border:1px solid #2a3a5a;padding:3px 8px}
#explore{position:absolute;left:2.2vw;top:8vh;z-index:8;display:flex;flex-direction:column;gap:8px;background:rgba(6,10,22,.7);padding:12px;border-radius:10px;border:1px solid rgba(140,180,255,.3)}
#explore .exTitle{font-weight:700;color:#9fd0ff}
#explore button{font-family:inherit;font-size:13px;padding:6px 12px;border-radius:6px;border:1px solid rgba(160,200,255,.4);background:rgba(30,50,100,.5);color:#fff;cursor:pointer}
#explore .exHint{font-size:12px;color:#8193b3}
body.free #stage{cursor:grab}