:root{--bg:#f4f5f7;--card:#fff;--ink:#1c1e24;--muted:#6b7280;--line:#e3e5ea;--accent:#2457c5;--accent-soft:#e8effc;--ok:#1f8a4c;--ok-soft:#e5f5ec;--bad:#c62828;--bad-soft:#fdeaea;--warn:#b26a00;--warn-soft:#fff4e0;--radius:10px}
*{box-sizing:border-box}
.hidden{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:break-word}
button,a.btn{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
button{font:inherit;cursor:pointer}
a{color:var(--accent)}
header.site{background:var(--card);border-bottom:1px solid var(--line);padding:16px 22px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
header.site .hl{flex:1;min-width:200px}
header.site h1{margin:0;font-size:22px}
header.site h1 a{color:inherit;text-decoration:none}
header.site .course{font-size:13px;margin-top:4px;color:var(--muted)}header.site .course a{color:var(--accent);text-decoration:none}header.site .course a:hover{text-decoration:underline}header.site .course b{color:var(--ink)}
header.site .sub{color:var(--muted);font-size:13px;margin-top:3px}
main{max-width:1100px;margin:0 auto;padding:20px 18px 60px}
.btn{font:inherit;border:1px solid var(--line);background:var(--card);color:var(--ink);padding:7px 14px;border-radius:8px;cursor:pointer;text-decoration:none;display:inline-block}
.btn:hover{border-color:#b9bec8}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:#1d49a6}
.btn.small{padding:4px 10px;font-size:13px}
.btn.danger{background:var(--bad);border-color:var(--bad);color:#fff}
.btn:disabled{opacity:.45;cursor:default}
.muted{color:var(--muted)}.small{font-size:12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.tag{font-size:12px;padding:2px 8px;border-radius:999px;background:#eef0f4;color:#3b4252;white-space:nowrap}
.tag.ok{background:var(--ok-soft);color:var(--ok)}.tag.bad{background:var(--bad-soft);color:var(--bad)}.tag.warn{background:var(--warn-soft);color:var(--warn)}.tag.acc{background:var(--accent-soft);color:var(--accent)}
.userbar{display:flex;align-items:center;gap:10px;font-size:14px;flex-wrap:wrap}
.userbar .av{width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
/* login */
.card.login{display:block;max-width:720px;margin:30px auto}
.login h1{font-size:22px;margin:0 0 6px}
.login .userlist{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin:16px 0}
.userbtn{display:flex;gap:12px;align-items:center;text-align:left;border:1.5px solid var(--line);background:var(--card);border-radius:10px;padding:10px 12px;color:var(--ink);font:inherit;cursor:pointer}
.userbtn:hover{border-color:var(--accent);background:var(--accent-soft)}
.userbtn .av{flex:0 0 38px;height:38px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:17px}
.newuser{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.newuser input{font:inherit;padding:8px 12px;border:1.5px solid var(--line);border-radius:8px;flex:1;min-width:200px}
/* index */
.stats{display:flex;gap:22px;flex-wrap:wrap;margin:0 0 18px;font-size:14px;color:var(--muted)}
.stats b{color:var(--ink);font-size:18px;display:block}
.viewseg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden;margin-bottom:14px;background:var(--card);flex-wrap:wrap}
.viewseg button{border:0;background:transparent;padding:9px 18px;color:var(--muted)}
.viewseg button.on{background:var(--accent);color:#fff}
.tools{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:16px}
.tools input,.tools select{font:inherit;padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:#fff}
.tools input{min-width:220px}
.famnote{color:var(--muted);font-size:14px;margin:-4px 0 14px}
h2.decade{font-size:17px;margin:24px 0 10px;padding-bottom:6px;border-bottom:1px solid var(--line)}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.ccard{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:13px 15px;display:flex;flex-direction:column;gap:7px;text-decoration:none;color:inherit}
.ccard:hover{border-color:#b9bec8;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.ccard .t{font-weight:600}
.ccard .meta{display:flex;flex-wrap:wrap;gap:6px}
.ccard .res{font-size:13px;color:var(--muted)}
.ccard .res b{color:var(--ok)}
.empty{color:var(--muted);padding:30px;text-align:center}
.mlist{display:grid;gap:8px}
.mrow{display:flex;gap:10px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:10px 14px;text-decoration:none;color:inherit;flex-wrap:wrap}
.mrow:hover{border-color:#b9bec8}
.mrow .t{font-weight:600;flex:1;min-width:160px}
/* test page */
header.top{position:sticky;top:0;z-index:10;background:var(--card);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;padding:9px 18px;flex-wrap:wrap}
header.top .title{font-weight:600;flex:1;min-width:150px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
header.top .title a{color:inherit;text-decoration:none}
.htools{display:flex;align-items:center;gap:8px}
.timer{font-variant-numeric:tabular-nums;font-weight:600;font-size:18px;padding:3px 12px;border-radius:8px;background:var(--accent-soft);color:var(--accent)}
.timer.low{background:var(--bad-soft);color:var(--bad)}
.timer.paused{background:var(--warn-soft);color:var(--warn)}
body.test{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}
.tmain{max-width:860px;width:100%;flex:1}
.qhead{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.qnum{background:var(--ink);color:#fff;font-weight:600;padding:3px 10px;border-radius:6px}
.flag{border:1px solid var(--line);background:var(--card);border-radius:6px;padding:4px 10px;font-size:13px}
.flag.on{background:var(--warn-soft);border-color:var(--warn);color:var(--warn)}
.stem{font-size:16.5px;line-height:1.7}
.stem p{margin:0 0 12px}
.stem hr.shared{border:0;border-top:1px dashed var(--line);margin:4px 0 14px}
img.fig{max-width:100%;height:auto;display:block;margin:10px auto;cursor:zoom-in}
img.texfb{vertical-align:middle;max-width:100%}
img.texfb.d{display:block;margin:8px auto}
.katex{font-size:1.08em}
.katex-display{overflow-x:auto;overflow-y:hidden;padding:2px 0}
.choices{display:grid;gap:9px;margin:18px 0 6px}
.ch{display:flex;align-items:stretch;gap:0;border:1.5px solid var(--line);border-radius:9px;background:var(--card);overflow:hidden}
.ch .pick{flex:1;display:flex;align-items:center;gap:12px;text-align:left;border:0;background:transparent;padding:10px 12px;color:var(--ink);min-height:48px}
.ch .let{flex:0 0 30px;height:30px;border-radius:50%;border:1.5px solid #9aa1ad;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px}
.ch .x{border:0;border-left:1px solid var(--line);background:transparent;color:var(--muted);padding:0 14px;font-size:13px}
.ch:hover{border-color:#b9bec8}
.ch.sel{border-color:var(--accent);background:var(--accent-soft)}
.ch.sel .let{background:var(--accent);border-color:var(--accent);color:#fff}
.ch.crossed .pick{opacity:.4;text-decoration:line-through}
.ch.right{border-color:var(--ok);background:var(--ok-soft)}.ch.right .let{background:var(--ok);border-color:var(--ok);color:#fff}
.ch.wrong{border-color:var(--bad);background:var(--bad-soft)}.ch.wrong .let{background:var(--bad);border-color:var(--bad);color:#fff}
.choices.letters{grid-template-columns:repeat(5,1fr)}
.choices.letters .ch .pick{justify-content:center}
.aime{display:flex;gap:10px;align-items:center;margin:18px 0;flex-wrap:wrap}
.aime input{font:600 22px/1 inherit;width:130px;padding:10px 12px;border:1.5px solid var(--line);border-radius:9px;text-align:center;font-variant-numeric:tabular-nums}
.aime input:focus{outline:0;border-color:var(--accent)}
.aime input.right{border-color:var(--ok);background:var(--ok-soft)}.aime input.wrong{border-color:var(--bad);background:var(--bad-soft)}
.qnav{display:flex;justify-content:space-between;gap:10px;margin-top:20px}
.feedback{margin:14px 0;padding:12px 14px;border-radius:9px;font-weight:600}
.feedback.ok{background:var(--ok-soft);color:var(--ok)}.feedback.bad{background:var(--bad-soft);color:var(--bad)}.feedback.info{background:#eef0f4;color:#3b4252;font-weight:400}
.sols{margin-top:18px}
.sol{border:1px solid var(--line);border-radius:9px;margin:10px 0;background:#fcfcfd}
.sol>summary{cursor:pointer;padding:10px 14px;font-weight:600}
.sol .body{padding:0 16px 12px;line-height:1.7}
.sol .body .c{text-align:center}
.sol .body pre{white-space:pre-wrap}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:7px}
.grid button{border:1.5px solid var(--line);background:var(--card);border-radius:7px;padding:8px 0;font-weight:600;position:relative}
.grid button.ans{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.grid button.cur{outline:2px solid var(--ink);outline-offset:1px}
.grid button.flg::after{content:"";position:absolute;top:3px;right:3px;width:7px;height:7px;border-radius:50%;background:var(--warn)}
.grid button.ok{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}
.grid button.bad{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}
.modal{position:fixed;inset:0;background:rgba(20,22,28,.45);z-index:50;display:flex;align-items:center;justify-content:center;padding:16px}
.modal .card{max-width:560px;width:100%;max-height:85vh;overflow:auto}
.modal.zoom{background:rgba(20,22,28,.85);cursor:zoom-out}
.modal.zoom img{max-width:96vw;max-height:92vh;background:#fff;border-radius:6px;padding:8px}
.bottombar{position:sticky;bottom:0;background:var(--card);border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:10px;padding:9px 18px calc(9px + env(safe-area-inset-bottom))}
.bottombar .pos{color:var(--muted);font-size:14px}
.opts{display:grid;gap:10px;margin:16px 0}
.opt{display:flex;gap:10px;align-items:flex-start;border:1.5px solid var(--line);border-radius:9px;padding:11px 13px;cursor:pointer}
.opt input{margin-top:4px}
.opt.on{border-color:var(--accent);background:var(--accent-soft)}
.scorebox{display:flex;gap:26px;flex-wrap:wrap;margin:10px 0 18px}
.scorebox div{font-size:14px;color:var(--muted)}
.scorebox b{display:block;font-size:26px;color:var(--ink)}
table.rev{width:100%;border-collapse:collapse;font-size:14px}
table.rev th,table.rev td{border-bottom:1px solid var(--line);padding:7px 8px;text-align:left}
table.rev tr.click{cursor:pointer}
table.rev tr.click:hover{background:#f7f8fa}
.ok-t{color:var(--ok);font-weight:600}.bad-t{color:var(--bad);font-weight:600}
/* dashboard */
.dgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px;margin:14px 0}
.bar{height:10px;border-radius:5px;background:#eef0f4;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--accent)}
.brow{display:grid;grid-template-columns:110px 1fr 70px;gap:10px;align-items:center;font-size:14px;margin:7px 0}
svg.trend{width:100%;height:auto;display:block}
@media (max-width:640px){
  header.site{padding:12px 16px}
  main{padding:14px 16px 60px}
  header.top{padding:8px 12px;gap:8px}
  header.top .title{flex-basis:100%;order:-1;font-size:14px}
  .stem{font-size:16px}
  .tools input{min-width:0;flex:1}
  .choices.letters{grid-template-columns:repeat(5,1fr);gap:6px}
  .bottombar{padding:8px 12px calc(8px + env(safe-area-inset-bottom))}
  .brow{grid-template-columns:90px 1fr 60px}
  .viewseg button{padding:8px 13px}
}
/* topic notes */
.note{line-height:1.65}
.note .lead{font-size:16px}
.note h3{font-size:15px;margin:16px 0 6px;text-transform:uppercase;letter-spacing:.03em;color:var(--muted)}
.note ul{padding-left:22px;margin:0}
.note li{margin:4px 0}
.note .ex{border-left:3px solid var(--accent);background:#f8faff;padding:6px 14px;border-radius:0 8px 8px 0}
.note .ex summary{cursor:pointer;color:var(--accent)}
.dom{margin:22px 0 8px;font-size:18px}
.tcards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px}
.tcard{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px;text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:6px}
.tcard:hover{border-color:#b9bec8;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.tcard .nm{font-weight:600}
.tcard .ds{font-size:13px;color:var(--muted)}
.mexam{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 12px}
.figmiss{display:inline-block;margin:8px 0;padding:6px 12px;border:1px dashed var(--line);border-radius:8px;font-size:13px}

/* physics: questions are images cut from the exam booklets */
.qstem img.qimg{display:block;max-width:100%;height:auto;margin:0 0 10px;background:#fff;border-radius:6px;cursor:zoom-in}
.qstem img.qimg.shared{margin-bottom:14px;padding-bottom:10px;border-bottom:1px dashed var(--line)}
.sg img.qimg{display:block;max-width:100%;height:auto;margin:0 0 12px;background:#fff;border:1px solid var(--line);border-radius:6px;cursor:zoom-in}
.expl .body p{margin:0 0 10px}
/* topic simulations (sims/*.js) */
.sims{margin:18px 0 6px}
.sim{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;margin:0 0 16px}
.sim-h{margin:0 0 8px;font-size:15px}
.sim-cv{width:100%}
.sim-cv canvas{display:block;width:100%;border-radius:6px;border:1px solid var(--line);touch-action:pan-y}
.sim-ctl{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin-top:10px}
.sim-sl{display:flex;align-items:center;gap:6px;font-size:13px}
.sim-sl input[type=range]{width:120px}
.sim-sl output{min-width:52px;color:var(--muted);font-variant-numeric:tabular-nums}
.sim-sl select{font:inherit;padding:3px 6px;border:1px solid var(--line);border-radius:6px;background:var(--card)}
.sim-tg{font-size:13px;display:flex;align-items:center;gap:5px}
.sim-cap{margin:10px 0 0;font-size:13px;color:var(--muted)}
@media (pointer:coarse){.sim-sl input[type=range]{width:150px;height:28px}}
/* questions retyped from photos (data/rt/*.js): printed-exam look, always on white like the photos */
.rt{font-family:"Times New Roman",Times,serif;font-size:18px;line-height:1.55;color:#111;background:#fff;padding:14px 18px;border-radius:6px;overflow-x:auto}
.rt p{margin:0 0 .55em}
.rt .katex{font-size:1.08em}
.rt-fig{margin:4px auto 12px;text-align:center}
.rt-fig svg{max-width:min(100%,400px);height:auto;display:inline-block}
.rt-fig figcaption{font-size:16px;margin-top:2px}
.rt-table table{border-collapse:collapse;margin:0 auto}
.rt-table th,.rt-table td{border:1px solid #111;padding:4px 12px;text-align:center;font-weight:normal}
.rt-ch{list-style:none;padding:0;margin:.5em 0 0}
.rt-col li{margin:.4em 0 .4em .4em}
.rt-row{display:flex;flex-wrap:wrap;gap:.45em 2.4em;margin-left:.4em}
.rt-l{margin-right:.35em}
/* retyped free-response parts, graph choices, figure rows, kept scan figures (pipeline/retype, blocks format) */
.rt-fig svg{max-width:min(100%,var(--rtw,400px))}
.rt-part{display:flex;align-items:baseline;gap:.5em;margin:.35em 0 .6em}
.rt-pl{flex:0 0 auto;min-width:1.7em}
.rt-pb{flex:1 1 auto;min-width:0}
.rt-figrow{display:flex;flex-wrap:wrap;justify-content:center;gap:4px 22px}
.rt-figrow .rt-fig{margin:4px 0 10px;flex:1 1 170px;min-width:0}
.rt-tcap{font-size:16px;margin:4px 0 2px;text-align:center}
.rt-table{overflow-x:auto;overflow-y:hidden;padding-bottom:3px}
.rt-kept img{max-width:100%;height:auto}
.rt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));gap:.6em 1.4em;margin-left:.2em}
.rt-grid li,.rt-col li{display:flex;align-items:baseline;gap:.2em}
.rt-c{min-width:0}
.rt-cfig{margin:0;display:inline-block;vertical-align:top}
.rt-cfig svg{max-width:min(100%,var(--rtw,240px));height:auto;display:block}
.rt-cfig figcaption{font-size:15px;text-align:center}
.rt .katex-display{margin:.5em 0;overflow-x:auto;overflow-y:hidden;padding-bottom:4px}
@media (max-width:520px){.rt{font-size:17px;padding:12px 12px}.rt-row{gap:.4em 1.6em}}
.rt-list{margin:.2em 0 .6em .6em;display:grid;grid-template-columns:max-content minmax(0,1fr);column-gap:.6em;row-gap:.4em;align-items:baseline}.rt-li{display:contents}.rt-lil{flex:0 0 auto;min-width:2.1em;text-align:right}.rt-lit{min-width:0}
.rt-nw{white-space:nowrap}
.rt-table .rt-dr{border-right:3px double #111}.rt-table .rt-db{border-bottom:3px double #111}.rt-table .rt-nb{border:0}
.rt-table table.rt-open{border-style:hidden}
.rt-table table.rt-vrules{border:1px solid #111}.rt-table table.rt-vrules td,.rt-table table.rt-vrules th{border-top:0;border-bottom:0}.rt-table table.rt-vrules .rt-sb,.rt-table .rt-sb{border-bottom:1px solid #111}.rt-table table.rt-vrules .rt-db{border-bottom:3px double #111}
.rt-figrow .rt-table{flex:0 1 auto;align-self:center}
.rt-parth{display:block}.rt-ph{font-weight:bold;margin:.2em 0 .3em}
.rt-cb .rt-stem p{margin:0 0 .3em}.rt-cb .rt-list{margin:.1em 0 .2em 0}
.rt-lil.rt-in{position:relative;left:1.4em}.rt-lil.rt-in+.rt-lit{padding-left:1.4em}.rt-table table.rt-norules td,.rt-table table.rt-norules th{border:0}
.rt-list.rt-lrow{display:flex;flex-wrap:wrap;gap:.4em 2.6em}.rt-lrow .rt-li{display:flex;align-items:baseline;gap:.5em}
.rt-table table.rt-open.rt-vrules{border-style:hidden}

/* deeper level notes: lessons + worked-example ladder */
.note b{color:#1d2b4f}.note u{text-decoration-color:#e8590c;text-decoration-thickness:2px;text-underline-offset:3px}
.note i{color:#3b4a6b}
.note .lessons{display:flex;flex-direction:column;gap:10px}
.note .lesson{border:1px solid var(--line);border-radius:10px;padding:10px 14px 8px;background:var(--card)}
.note .lesson h4{margin:0 0 6px;font-size:16px;display:flex;align-items:center;gap:8px}
.note .lesson .ln{flex:none;width:24px;height:24px;border-radius:50%;background:var(--accent);color:#fff;font-size:13px;display:inline-flex;align-items:center;justify-content:center}
.note .lesson p{margin:6px 0}
.note .lesson .key{background:#fff8e1;border-left:3px solid #f0b429;padding:6px 10px;border-radius:0 6px 6px 0}
.note .seen{font-size:13px;color:var(--muted)}.note .seen b{color:var(--muted)}
.note .ex + .ex{margin-top:10px}
.note .ex .tier{display:inline-block;font-size:12px;font-weight:700;padding:1px 8px;border-radius:10px;margin-right:4px;vertical-align:1px;background:#e3ecff;color:#2851b5}
.note .ex-c .tier{background:#fff1d6;color:#9a5b00}.note .ex-c{border-left-color:#f0b429}
.note .ex-x .tier{background:#ffe0e0;color:#b42318}.note .ex-x{border-left-color:#e5484d}
.note ol.steps{padding-left:24px;margin:6px 0}.note ol.steps li{margin:5px 0}
.note .insight{background:#eef7ee;padding:6px 10px;border-radius:6px}
.note .tier.calc{background:#e9e3ff;color:#5b3cc4}
/* animated step-by-step solutions (viz.js) */
.vz{margin:10px 0 6px;border:1px solid var(--line);border-radius:10px;background:#fff;padding:10px 12px 8px}
.vz-fig{display:flex;justify-content:center}
.vz-svg{width:100%;max-width:480px;max-height:360px;height:auto;overflow:visible}
.vz-t{font-family:"Cambria Math","Times New Roman",serif;paint-order:stroke;stroke:#fff;stroke-width:3px;stroke-linejoin:round}
.vz-t.b{font-weight:700}
.vz-cap{min-height:3.2em;margin:8px 2px 6px;padding:8px 12px;background:var(--accent-soft);border-radius:8px;line-height:1.55}
.vz-bar{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.vz-b{font:inherit;font-size:13px;border:1px solid var(--line);background:var(--card);border-radius:7px;padding:4px 10px;cursor:pointer;color:var(--ink)}
.vz-b:hover{border-color:var(--accent)}
.vz-play{background:var(--accent);border-color:var(--accent);color:#fff;min-width:84px}
.vz-dots{display:inline-flex;gap:4px;margin:0 6px;flex-wrap:wrap}
.vz-dots i{width:9px;height:9px;border-radius:50%;background:var(--line);cursor:pointer}
.vz-dots i.past{background:#9db4e6}.vz-dots i.on{background:var(--accent)}
.vz-o{transition:opacity .35s}
.vz-dr{stroke-dasharray:1;stroke-dashoffset:1;animation:vzdraw .8s ease forwards}
@keyframes vzdraw{to{stroke-dashoffset:0}}
.vz-pop{transform-box:fill-box;transform-origin:center;animation:vzpop .45s ease}
@keyframes vzpop{0%{transform:scale(0)}70%{transform:scale(1.5)}100%{transform:scale(1)}}
.vz-fade{animation:vzfade .7s ease}
@keyframes vzfade{from{opacity:0}}
.vz-hl{animation:vzhl 1.4s ease-in-out 2}
@keyframes vzhl{50%{filter:drop-shadow(0 0 4px #ffb300) drop-shadow(0 0 2px #ffb300)}}
.note .ex .vz-h{font-weight:600;color:var(--accent);margin:10px 0 0;font-size:14px}
@media (prefers-reduced-motion:reduce){.vz-dr,.vz-pop,.vz-fade,.vz-hl{animation:none;stroke-dasharray:none}}
.vz-svg.vz-3d{cursor:grab;touch-action:none}.vz-svg.vz-3d:active{cursor:grabbing}
.vz-hint{fill:#9aa3b5;font-size:15px;font-style:italic}