/* BOND LAB — стили. Сцена 1600×900 масштабируется под любой экран (см. app.js → fit). */
:root{
  --bg:#060a13; --ink:#f3f7ff; --ink2:#b3c1dd; --ink3:#7586aa;
  --line:rgba(130,175,255,.2); --line2:rgba(130,175,255,.38);
  --panel:rgba(110,150,255,.055);
  --cy:#55d9ff; --teal:#3ef0c8; --vio:#a98bff; --warm:#ffb057; --red:#ff6f72; --ok:#4be3a0;
  --mono:"JetBrains Mono","Cascadia Mono","Cascadia Code",Consolas,"SFMono-Regular",Menlo,"DejaVu Sans Mono",monospace;
  --sans:"Inter","Segoe UI Variable Display","Segoe UI",system-ui,-apple-system,"Helvetica Neue","Noto Sans",Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden;background:#02040a;color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
button:focus-visible{outline:2px solid var(--cy);outline-offset:3px}
b{font-weight:650;color:#fff}

#stage{position:absolute;left:50%;top:50%;width:1600px;height:900px;-webkit-transform-origin:center;transform-origin:center;-webkit-transform:translate(-50%,-50%) scale(.5);transform:translate(-50%,-50%) scale(.5);overflow:hidden;overflow:clip;
  background:radial-gradient(1200px 700px at 72% 38%,#0f1c3d 0%,transparent 62%),radial-gradient(900px 600px at 8% 100%,#1a1340 0%,transparent 60%),var(--bg)}
.bg-grid{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;opacity:.55;
  background-image:linear-gradient(rgba(120,170,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(120,170,255,.07) 1px,transparent 1px),linear-gradient(rgba(120,170,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(120,170,255,.035) 1px,transparent 1px);
  background-size:160px 160px,160px 160px,32px 32px,32px 32px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 45%,#000 30%,transparent 85%);mask-image:radial-gradient(ellipse at 50% 45%,#000 30%,transparent 85%)}
#dust{position:absolute;top:0;right:0;bottom:0;left:0;width:1600px;height:900px;pointer-events:none}

.mono,.kicker,.label{font-family:var(--mono);text-transform:uppercase;letter-spacing:.14em;font-size:15px;color:var(--ink3)}
.kicker{color:var(--cy);font-size:16px}
.k-ion{color:var(--vio)} .k-cov{color:var(--cy)} .k-met{color:var(--warm)} .k-hb{color:var(--teal)}
.label{margin:18px 0 10px}

/* ── панели управления презентацией ── */
#topbar{position:absolute;left:0;right:0;top:0;height:60px;display:flex;align-items:center;gap:28px;padding:0 70px;border-bottom:1px solid var(--line);transition:opacity .5s;z-index:5}
.logo{font-weight:800;letter-spacing:.22em;font-size:17px;display:flex;align-items:center;gap:12px}
.logo-mark{width:22px;height:10px;border-radius:5px;background:linear-gradient(90deg,var(--vio),var(--cy));position:relative;box-shadow:0 0 14px rgba(85,217,255,.6)}
.top-sec{font-family:var(--mono);font-size:15px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink2);flex:1}
.top-hint{font-family:var(--mono);font-size:13px;letter-spacing:.1em;color:var(--ink3)}
.is-title #topbar{opacity:0;pointer-events:none}

#bottombar{position:absolute;left:0;right:0;bottom:0;height:64px;display:flex;align-items:center;gap:26px;padding:0 70px;border-top:1px solid var(--line);z-index:5;background:linear-gradient(transparent,rgba(4,7,14,.7))}
.ic-btn{display:inline-flex;align-items:center;gap:10px;height:40px;padding:0 14px;border:1px solid var(--line);border-radius:8px;font-family:var(--mono);font-size:14px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink2);transition:.2s}
.ic-btn:hover{border-color:var(--cy);color:#fff;background:rgba(85,217,255,.1)}
.ic-btn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.ic-next{border-color:var(--line2);color:#fff}
.ic-btn:disabled{opacity:.3;pointer-events:none}
.nav{display:flex;align-items:center;gap:10px}
.counter{font-family:var(--mono);font-size:16px;letter-spacing:.1em;min-width:92px;text-align:center;color:var(--ink)}
.progress{flex:1;display:flex;gap:6px;align-items:center;height:40px}
.progress button{flex:1;height:26px;position:relative}
.progress button::after{content:"";position:absolute;left:0;right:0;top:11px;height:4px;border-radius:2px;background:rgba(130,175,255,.2);transition:.3s}
.progress button.done::after{background:rgba(85,217,255,.55)}
.progress button.cur::after{background:#fff;box-shadow:0 0 12px var(--cy);height:6px;top:10px}
.progress button:hover::after{background:var(--cy)}

/* ── слайды ── */
.slide{position:absolute;left:0;right:0;top:60px;bottom:64px;padding:22px 70px 14px;opacity:0;visibility:hidden;transform:translateX(70px);transition:opacity .5s ease,transform .7s cubic-bezier(.2,.7,.2,1),visibility 0s .5s;display:flex;flex-direction:column}
.slide.past{transform:translateX(-70px)}
.slide.active{opacity:1;visibility:visible;transform:none;transition:opacity .6s ease .1s,transform .7s cubic-bezier(.2,.7,.2,1) .1s,visibility 0s}
.slide.active .rise{animation:rise .8s cubic-bezier(.2,.7,.2,1) both;animation-delay:calc(var(--i,0)*110ms + 250ms)}
@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
.head{margin-bottom:16px}
.head.center{text-align:center}
h2{font-size:46px;line-height:1.1;font-weight:750;letter-spacing:-.01em;margin-top:8px}
.body.cols{display:grid;grid-template-columns:1fr 430px;gap:30px;flex:1;min-height:0}
.side{display:flex;flex-direction:column;min-height:0}
.side>*{flex-shrink:0}
.lead{font-size:22px;line-height:1.42;color:var(--ink2)}

.panel{position:relative;border:1px solid var(--line);border-radius:14px;background:var(--panel);overflow:hidden}
.panel::before,.panel::after{content:"";position:absolute;width:18px;height:18px;border:2px solid var(--cy);opacity:.8;pointer-events:none;z-index:2}
.panel::before{left:-1px;top:-1px;border-right:0;border-bottom:0;border-radius:14px 0 0 0}
.panel::after{right:-1px;bottom:-1px;border-left:0;border-top:0;border-radius:0 0 14px 0}
.viz{display:flex;flex-direction:column;align-items:stretch;justify-content:center}
.viz svg,.viz canvas{display:block;width:100%;height:auto}
.model-note{position:absolute;left:18px;bottom:12px;font-family:var(--mono);font-size:13px;letter-spacing:.06em;color:var(--ink3);text-transform:uppercase}
svg text{font-family:var(--sans);fill:var(--ink)}
svg .t-mono{font-family:var(--mono);letter-spacing:.08em}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:10px 20px;border:1px solid var(--line2);border-radius:10px;font-size:18px;font-weight:600;color:var(--ink);background:rgba(120,160,255,.08);transition:.2s;text-align:center}
.btn:hover{border-color:var(--cy);background:rgba(85,217,255,.16)}
.btn-main{background:linear-gradient(135deg,#2bb8ff,#7a6bff);border-color:transparent;color:#fff;box-shadow:0 6px 26px rgba(70,150,255,.35)}
.btn-main:hover{filter:brightness(1.15);background:linear-gradient(135deg,#2bb8ff,#7a6bff)}
.btn-ghost{background:none;color:var(--ink2)}
.btn-wide{width:100%}
.btn-xl{font-size:22px;letter-spacing:.08em;text-transform:uppercase;padding:20px 34px;border-radius:12px;font-family:var(--mono)}
.btn-xl .arr{transition:transform .25s}.btn-xl:hover .arr{transform:translateX(6px)}
.btn:disabled{opacity:.35;pointer-events:none}
.btn[aria-pressed="true"]{border-color:var(--warm);background:rgba(255,176,87,.18);color:#fff}
.btn-col{display:flex;flex-direction:column;gap:8px;margin-top:auto}
.btn-col .btn{min-height:42px;font-size:16px;padding:6px 14px}
.btn-row{display:flex;gap:12px;margin-top:18px}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{padding:8px 14px;border:1px solid var(--line2);border-radius:999px;font-size:17px;color:var(--ink2);transition:.2s}
.chip:hover{border-color:var(--cy);color:#fff}
.chip.on{background:var(--cy);border-color:var(--cy);color:#041220;font-weight:650}
.def{margin-top:14px;padding:14px 16px;border-left:3px solid var(--cy);background:rgba(85,217,255,.07);border-radius:0 10px 10px 0;font-size:19px;line-height:1.42;color:var(--ink);min-height:84px}
.status{margin-top:14px;font-family:var(--mono);font-size:16px;line-height:1.4;color:var(--teal);min-height:46px}
.props{list-style:none;display:flex;flex-direction:column;gap:9px}
.props li{position:relative;padding-left:22px;font-size:18px;line-height:1.38;color:var(--ink2)}
.props li::before{content:"";position:absolute;left:2px;top:.55em;width:8px;height:8px;border-radius:50%;background:var(--cy);box-shadow:0 0 8px var(--cy)}
.props-warn{margin-top:14px}
.props-warn li{font-size:17px}
.props-warn li::before{background:var(--warm);box-shadow:0 0 8px var(--warm);border-radius:2px}
.foot-note{margin-top:16px;font-size:19px;line-height:1.4;color:var(--ink2);max-width:1300px}

.seg{display:grid;gap:0;border:1px solid var(--line2);border-radius:10px;overflow:hidden}
.seg-2{grid-template-columns:1fr 1fr}.seg-3{grid-template-columns:repeat(3,1fr)}
.seg button{padding:11px 6px;font-size:16px;font-weight:600;color:var(--ink2);border-right:1px solid var(--line);transition:.2s}
.seg button:last-child{border-right:0}
.seg button:hover{color:#fff;background:rgba(85,217,255,.1)}
.seg button.on{background:var(--cy);color:#041220}
.seg-big button{font-size:19px;padding:14px 6px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.08em}
#polMols{margin-top:12px}
#hbHeat{margin-top:10px}

/* ── титул ── */
.slide-title{top:0;bottom:64px;padding:0}
#titleCanvas{position:absolute;top:0;right:0;bottom:0;left:0;width:1600px;height:836px}
.hero{position:absolute;left:90px;top:150px;width:800px}
.hero .kicker{font-size:17px}
h1{font-size:156px;line-height:.95;font-weight:800;letter-spacing:-.02em;margin:18px 0 14px;
  background:linear-gradient(100deg,#fff 20%,#9be6ff 60%,#a98bff 100%);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 34px rgba(85,217,255,.28))}
.hero-sub{font-family:var(--mono);font-size:30px;letter-spacing:.2em;text-transform:uppercase;color:#fff}
.hero-q{font-size:28px;line-height:1.35;color:var(--ink2);margin:26px 0 38px;max-width:640px}
.title-cap{position:absolute;right:70px;bottom:20px;font-family:var(--mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink3)}

/* ── слайд 1 ── */
.viz-ctrl{display:flex;align-items:center;gap:14px;padding:6px 22px 16px}
input[type=range]{flex:1;-webkit-appearance:none;appearance:none;height:6px;border-radius:3px;background:rgba(130,175,255,.3);outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:26px;height:26px;border-radius:50%;background:#fff;box-shadow:0 0 0 5px rgba(85,217,255,.35),0 0 18px var(--cy);cursor:grab}
input[type=range]::-moz-range-thumb{width:26px;height:26px;border:0;border-radius:50%;background:#fff;box-shadow:0 0 0 5px rgba(85,217,255,.35),0 0 18px var(--cy);cursor:grab}
#whySvg .shell{fill:none;stroke:rgba(160,220,255,.45);stroke-width:1.5;stroke-dasharray:4 6;transition:.3s}
#whySvg .nuc,#whySvg .cloud,#whySvg .el,#whySvg .atomring,#whySvg .bondglow{transition:opacity .3s,stroke-width .3s}
#whySvg .atomring{fill:none;stroke:#fff;stroke-width:2.5;opacity:0}
#whySvg[data-hl="atom"] .atomring{opacity:1}
#whySvg[data-hl="nuc"] .cloud,#whySvg[data-hl="nuc"] .shell,#whySvg[data-hl="nuc"] .el{opacity:.2}
#whySvg[data-hl="nuc"] .nuc{stroke:#fff;stroke-width:4}
#whySvg[data-hl="shell"] .shell{stroke:#fff;stroke-width:3.5;stroke-dasharray:none}
#whySvg[data-hl="shell"] .nuc{opacity:.35}
#whySvg[data-hl="val"] .cloud,#whySvg[data-hl="val"] .nuc{opacity:.3}
#whySvg[data-hl="val"] .el{stroke:#fff;stroke-width:5}
#whySvg .el{fill:#bff4ff;stroke:rgba(85,217,255,.5);stroke-width:3}

/* ── слайд 2 ── */
.types{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;flex:1;min-height:0}
.type-card{--c:var(--cy);text-align:left;display:flex;flex-direction:column;padding:26px 28px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(180deg,rgba(120,160,255,.08),rgba(120,160,255,.02));transition:transform .3s,border-color .3s,box-shadow .3s;position:relative;overflow:hidden}
.t-ion{--c:var(--vio)} .t-cov{--c:var(--cy)} .t-met{--c:var(--warm)} .t-hb{--c:var(--teal)}
.type-card::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;background:var(--c);box-shadow:0 0 22px var(--c)}
.type-card:hover{transform:translateY(-8px);border-color:var(--c);box-shadow:0 20px 60px rgba(0,0,0,.45),0 0 0 1px var(--c) inset}
.type-art{height:250px;display:flex;align-items:center;justify-content:center;margin-bottom:8px}
.type-art svg{width:100%;height:100%}
.type-name{font-family:var(--mono);font-size:34px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--c)}
.type-card p{font-size:21px;line-height:1.4;color:var(--ink2);margin-top:12px;flex:1}
.type-go{font-family:var(--mono);font-size:15px;letter-spacing:.12em;text-transform:uppercase;color:var(--c);margin-top:14px}

/* мини-иконки */
.ico .ring{fill:none;stroke:rgba(160,210,255,.5);stroke-width:1.4;stroke-dasharray:3 4}
.ico .e{fill:#bff4ff}
.ico text{font-weight:700;font-size:18px;text-anchor:middle;dominant-baseline:central;fill:#06101f}
.ico .lbl{fill:#fff;font-size:15px}
.ico .hb{stroke:var(--teal);stroke-width:3;stroke-dasharray:3 7;stroke-linecap:round}
.ico .cb{stroke:#fff;stroke-width:5;stroke-linecap:round}
.ico .arrow{stroke:#fff;stroke-width:2.5;fill:none;stroke-linecap:round;stroke-linejoin:round}
.ico-ionic .ia{animation:ia 2.6s ease-in-out infinite}.ico-ionic .ib{animation:ib 2.6s ease-in-out infinite}
@keyframes ia{50%{transform:translateX(7px)}}@keyframes ib{50%{transform:translateX(-7px)}}
.ico-cov .e,.ico-polar .e{animation:pulse 1.8s ease-in-out infinite}
@keyframes pulse{50%{opacity:.45}}
.ico-metal .e{animation:drift 3.2s ease-in-out infinite alternate}
.ico-metal .e:nth-child(odd){animation-duration:2.3s;animation-direction:alternate-reverse}
@keyframes drift{from{transform:translate(-9px,5px)}to{transform:translate(11px,-6px)}}

/* ── ионная ── */
.steps{list-style:none;counter-reset:s;margin:12px 0 0;display:flex;flex-direction:column;gap:3px}
.steps li{counter-increment:s;display:flex;align-items:center;gap:12px;font-size:17px;color:var(--ink3);padding:3px 0;transition:.3s}
.steps li::before{content:counter(s);width:26px;height:26px;border-radius:50%;border:1px solid var(--line2);display:grid;place-items:center;font-family:var(--mono);font-size:13px;flex:none;transition:.3s}
.steps li.done{color:var(--ink2)}.steps li.done::before{background:rgba(85,217,255,.25);border-color:var(--cy);color:#fff}
.steps li.cur{color:#fff;font-weight:650}.steps li.cur::before{background:#fff;color:#041220;border-color:#fff;box-shadow:0 0 14px var(--cy)}
#ionText{min-height:118px;font-size:18px;margin-top:10px}
.overlay-canvas{position:absolute;top:0;right:0;bottom:0;left:0;width:100%!important;height:100%!important;opacity:0;transition:opacity .7s;pointer-events:none}
.show-lattice .overlay-canvas{opacity:1}
.show-lattice #ionSvg{opacity:0}
#ionSvg{transition:opacity .6s}
.lat-cap{position:absolute;left:24px;right:24px;top:18px;font-size:24px;opacity:0;transition:opacity .7s .5s;pointer-events:none;color:var(--ink)}
.lat-cap span{display:block;font-size:15px;font-family:var(--mono);letter-spacing:.04em;color:var(--ink2);margin-top:6px;line-height:1.5;text-transform:none}
.show-lattice .lat-cap{opacity:1}
.show-lattice .model-note{opacity:0}
#ionSvg .sh{fill:none;stroke:rgba(160,205,255,.4);stroke-width:1.4}
#ionSvg .e{fill:#bff4ff;stroke:rgba(85,217,255,.45);stroke-width:3}
#ionSvg .vac{fill:none;stroke:#fff;stroke-width:1.6;stroke-dasharray:3 3}

/* ── ковалентная ── */
.tabs{position:absolute;left:18px;top:16px;display:flex;gap:8px;z-index:3}
.tabs button{min-width:74px;padding:9px 12px;border:1px solid var(--line2);border-radius:9px;font-family:var(--mono);font-size:20px;font-weight:700;color:var(--ink2);background:rgba(6,10,19,.6);transition:.2s}
.tabs button:hover{border-color:var(--cy);color:#fff}
.tabs button.on{background:var(--cy);color:#041220;border-color:var(--cy)}
.lw-ring{fill:rgba(120,190,255,.07);stroke:rgba(160,215,255,.5);stroke-width:1.3;stroke-dasharray:4 5}
.lw-sym{font-weight:750;text-anchor:middle;dominant-baseline:central;fill:#06101f}
.lw-e{stroke:rgba(6,10,19,.7);stroke-width:1.5}
.lw-pair{fill:rgba(255,255,255,.1);stroke:#fff;stroke-width:1.6}
.lw-delta{font-size:26px;font-weight:700;text-anchor:middle;fill:#fff}
.info{margin-top:16px;display:grid;grid-template-columns:auto 1fr;gap:9px 16px;align-items:baseline;flex:1;align-content:start}
.info dt{font-family:var(--mono);font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink3)}
.info dd{font-size:20px;line-height:1.3;color:var(--ink)}
.info dd.big{font-family:var(--mono);font-size:30px;font-weight:700;color:var(--cy)}
.info-live{flex:none}

.mult{display:grid;grid-template-columns:1fr 430px;gap:30px;flex:1;min-height:0}
.mult-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.mcard{border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:16px 16px 20px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;transition:.25s}
.mcard:hover{border-color:var(--cy);transform:translateY(-5px)}
.mcard svg{width:100%;height:auto}
.mcard .mf{font-family:var(--mono);font-size:62px;font-weight:700;letter-spacing:.04em;margin-top:6px}
.mcard .mn{font-family:var(--mono);font-size:15px;letter-spacing:.14em;text-transform:uppercase;color:var(--cy);margin-top:8px}
.mcard .ms{font-size:22px;color:var(--ink2);margin-top:16px;line-height:1.6}
.mult-side{display:flex;flex-direction:column}
.mult-side .label{margin-top:0}
.bars{display:flex;flex-direction:column;gap:12px;margin-bottom:16px}
.bar{display:grid;grid-template-columns:78px 1fr 56px;gap:12px;align-items:center;font-family:var(--mono);font-size:19px}
.bar i{display:block;height:20px;border-radius:4px;background:linear-gradient(90deg,#2bb8ff,#7a6bff);width:0;transition:width 1.1s cubic-bezier(.2,.7,.2,1)}
.bar.extra i{background:linear-gradient(90deg,#ffb057,#ff6f72)}
.bar span:last-child{text-align:right;color:var(--ink2)}

/* ── металл ── */
.prop-btns{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.prop-btns button{padding:12px 10px;border:1px solid var(--line2);border-radius:10px;font-size:17px;font-weight:600;color:var(--ink2);transition:.2s}
.prop-btns button:hover{border-color:var(--warm);color:#fff}
.prop-btns button.on{background:var(--warm);border-color:var(--warm);color:#1c1002}
.hint-next{margin-top:auto;font-family:var(--mono);font-size:14px;letter-spacing:.08em;text-transform:uppercase;color:var(--warm)}
#metalText{border-left-color:var(--warm);background:rgba(255,176,87,.07);min-height:138px}
.cwrap{position:relative}
.battery{position:absolute;left:50%;top:88.8%;transform:translate(-50%,-50%);white-space:nowrap;display:flex;align-items:stretch;border:2px solid var(--line2);border-radius:12px;background:#0b1224;overflow:hidden;transition:.25s;box-shadow:0 0 0 0 rgba(255,176,87,0)}
.battery:hover{border-color:var(--warm)}
.bat-pole{width:44px;display:grid;place-items:center;font-size:28px;font-weight:800;background:rgba(130,175,255,.12)}
.bat-body{padding:8px 16px;display:flex;flex-direction:column;align-items:center;width:268px}
.bat-body b{font-family:var(--mono);font-size:15px;letter-spacing:.12em;text-transform:uppercase}
.bat-body i{font-style:normal;font-size:15px;color:var(--ink3);margin-top:2px}
.battery[aria-pressed="true"]{border-color:var(--warm);box-shadow:0 0 34px rgba(255,176,87,.45)}
.battery[aria-pressed="true"] .bat-pole{background:var(--warm);color:#1c1002}
.battery[aria-pressed="true"] i{color:var(--warm)}
.battery:not([aria-pressed="true"]){animation:attn 2.2s ease-in-out infinite}
@keyframes attn{50%{box-shadow:0 0 0 8px rgba(85,217,255,.14)}}

/* ── сравнение ── */
.cmp{display:flex;flex-direction:column;gap:8px;flex:1;min-height:0;justify-content:center}
.cmp-row{display:grid;grid-template-columns:260px repeat(3,1fr);gap:8px}
.cmp-row>*{padding:15px 20px;border-radius:10px;background:rgba(120,160,255,.06);font-size:21px;line-height:1.3;display:flex;align-items:center;transition:background .25s,opacity .25s,box-shadow .25s}
.cmp-row>.cmp-k{background:none;font-family:var(--mono);font-size:14px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink3);padding-left:0}
.cmp-row .big{font-family:var(--mono);font-size:27px;font-weight:700}
.cmp-head>*{background:none;padding:6px 20px}
.cmp-head button{font-family:var(--mono);font-size:25px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;gap:14px;border-bottom:3px solid var(--c);border-radius:10px 10px 0 0;color:var(--c);text-align:left}
.cmp-head span{width:92px;height:56px;flex:none}.cmp-head span svg{width:100%;height:100%}
.c-ion{--c:var(--vio)}.c-cov{--c:var(--cy)}.c-met{--c:var(--warm)}
.cmp-row:not(.cmp-head):hover>*:not(.cmp-k){background:rgba(85,217,255,.16)}
.cmp-row:not(.cmp-head):hover>.cmp-k{color:#fff}
.cmp[data-c="1"] .cmp-row>*:nth-child(2),.cmp[data-c="2"] .cmp-row>*:nth-child(3),.cmp[data-c="3"] .cmp-row>*:nth-child(4){background:rgba(255,255,255,.14);box-shadow:inset 0 0 0 1px rgba(255,255,255,.35)}
.cmp[data-c] .cmp-row>*:not(.cmp-k){opacity:.45}
.cmp[data-c="1"] .cmp-row>*:nth-child(2),.cmp[data-c="2"] .cmp-row>*:nth-child(3),.cmp[data-c="3"] .cmp-row>*:nth-child(4){opacity:1}

/* ── водородная ── */
#hbSvg .cov{stroke:#fff;stroke-width:7;stroke-linecap:round;transition:opacity .3s}
#hbSvg .hbl{stroke:var(--teal);stroke-width:4;stroke-dasharray:2 11;stroke-linecap:round;transition:opacity .25s}
#hbSvg[data-h="cov"] .hbl,#hbSvg[data-h="cov"] .l-hb{opacity:.12}
#hbSvg[data-h="hb"] .cov,#hbSvg[data-h="hb"] .l-cov{opacity:.15}
#hbSvg[data-h="cov"] .cov{stroke:var(--cy);filter:drop-shadow(0 0 8px var(--cy))}
#hbSvg[data-h="hb"] .hbl{stroke-width:6;filter:drop-shadow(0 0 8px var(--teal))}
#hbText{border-left-color:var(--teal);background:rgba(62,240,200,.07);min-height:96px;margin-bottom:14px;font-size:18px}
#hbSeg{margin-top:14px}

/* ── конструктор ── */
.build{display:grid;grid-template-columns:540px 1fr;gap:30px;flex:1;min-height:0}
.build-left{display:flex;flex-direction:column}
.task{padding:16px 18px;border:1px solid var(--line2);border-radius:12px;background:rgba(85,217,255,.07);font-size:21px;line-height:1.35}
.task small{display:block;font-family:var(--mono);font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--cy);margin-bottom:6px}
.palette{display:flex;gap:10px}
.atom-btn{width:74px;height:74px;border-radius:50%;font-size:26px;font-weight:800;color:#06101f;border:3px solid transparent;transition:.2s;box-shadow:inset -8px -10px 18px rgba(0,0,0,.35)}
.atom-btn:hover{transform:scale(1.1);border-color:#fff}
.a-H{background:#e2ecff}.a-O{background:#ff7070}.a-Cl{background:#66e28e}.a-Na{background:#ba96ff}
.bench{margin-top:12px;display:flex;gap:10px;align-items:center;min-height:86px;padding:8px 14px;border:1px dashed var(--line2);border-radius:12px}
.bench .atom-btn{width:66px;height:66px;font-size:23px}
.bench .ph{color:var(--ink3);font-size:17px}
.bench .plus{color:var(--ink3);font-size:26px}
.mech{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.mech button{padding:12px 10px;border:1px solid var(--line2);border-radius:10px;text-align:left;display:flex;flex-direction:column;gap:4px;transition:.2s}
.mech b{font-size:17px;line-height:1.2}.mech span{font-size:14px;color:var(--ink3);line-height:1.25}
.mech button:hover{border-color:var(--cy)}
.mech button.on{background:var(--cy);border-color:var(--cy)}.mech button.on b,.mech button.on span{color:#041220}
.build-right{display:flex;flex-direction:column;padding:18px 24px 20px}
.score{font-family:var(--mono);font-size:16px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink2);display:flex;justify-content:space-between}
.score b{color:var(--cy);font-size:22px}
#cSvg{flex:1;min-height:0;width:100%}
.feedback{min-height:104px;padding:14px 18px;border-radius:12px;font-size:20px;line-height:1.4;background:rgba(120,160,255,.07);border-left:4px solid var(--line2);color:var(--ink2)}
.feedback.ok{border-left-color:var(--ok);background:rgba(75,227,160,.1);color:#fff}
.feedback.bad{border-left-color:var(--red);background:rgba(255,111,114,.1);color:#fff}
.feedback strong{display:block;font-family:var(--mono);font-size:14px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:4px}
.feedback.ok strong{color:var(--ok)}.feedback.bad strong{color:var(--red)}
#cNext{align-self:flex-end;margin-top:12px}

/* ── викторина ── */
.quiz{flex:1;min-height:0;display:grid;grid-template-columns:1fr 640px;gap:30px}
.q-left{border:1px solid var(--line);border-radius:14px;background:var(--panel);padding:26px 30px;display:flex;flex-direction:column}
.q-meta{display:flex;justify-content:space-between;font-family:var(--mono);font-size:15px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink3)}
.q-meta b{color:var(--cy)}
.q-dots{display:flex;gap:6px;margin:14px 0 20px}
.q-dots i{flex:1;height:5px;border-radius:3px;background:rgba(130,175,255,.2)}
.q-dots i.ok{background:var(--ok)}.q-dots i.bad{background:var(--red)}.q-dots i.cur{background:#fff}
.q-text{font-size:36px;line-height:1.25;font-weight:650}
.q-art{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;margin-top:10px}
.q-art svg{max-height:290px;width:auto;height:100%}
.art-row{display:flex;gap:26px;align-items:center;justify-content:center;width:100%}
.art-row svg{width:168px;height:auto;flex:none}
.q-exp{display:none;gap:18px;align-items:center;padding:14px 18px;border-radius:12px;background:rgba(120,160,255,.08);border-left:4px solid var(--line2);margin-top:12px}
.q-exp.show{display:flex;animation:rise .5s both}
.q-exp svg{width:120px;height:72px;flex:none}
.q-exp p{font-size:19px;line-height:1.4}
.q-exp.ok{border-left-color:var(--ok)}.q-exp.bad{border-left-color:var(--red)}
.q-exp strong{font-family:var(--mono);font-size:14px;letter-spacing:.14em;text-transform:uppercase;display:block;margin-bottom:3px}
.q-exp.ok strong{color:var(--ok)}.q-exp.bad strong{color:var(--red)}
.q-right{display:flex;flex-direction:column;gap:12px}
.opt{padding:18px 22px;border:1px solid var(--line2);border-radius:12px;text-align:left;font-size:22px;line-height:1.3;display:flex;gap:16px;align-items:center;transition:.2s;background:rgba(120,160,255,.05)}
.opt i{font-style:normal;font-family:var(--mono);font-size:16px;width:34px;height:34px;border:1px solid var(--line2);border-radius:8px;display:grid;place-items:center;flex:none;color:var(--ink3)}
.opt:hover{border-color:var(--cy);background:rgba(85,217,255,.1);transform:translateX(5px)}
.locked .opt{pointer-events:none}
.locked .opt:not(.ok):not(.bad){opacity:.45}
.opt.ok{border-color:var(--ok);background:rgba(75,227,160,.16)}.opt.ok i{background:var(--ok);color:#041220;border-color:var(--ok)}
.opt.bad{border-color:var(--red);background:rgba(255,111,114,.14)}.opt.bad i{background:var(--red);color:#fff;border-color:var(--red)}
.q-next{margin-top:auto;align-self:flex-end}
.pool{display:flex;gap:10px;flex-wrap:wrap;min-height:66px;padding:10px;border:1px dashed var(--line2);border-radius:12px;align-items:center}
.pool:empty::after{content:"все карточки расставлены";color:var(--ink3);font-size:16px;padding-left:8px}
.dchip{padding:10px 20px;border-radius:10px;background:#fff;color:#06101f;font-family:var(--mono);font-size:24px;font-weight:700;cursor:grab;touch-action:none;user-select:none;position:relative;z-index:1;transition:box-shadow .2s}
.dchip.sel{box-shadow:0 0 0 4px var(--cy),0 0 22px var(--cy)}
.dchip.drag{z-index:20;cursor:grabbing;box-shadow:0 14px 34px rgba(0,0,0,.6)}
.zone{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:70px;padding:8px 10px 8px 20px;border:1px solid var(--line2);border-radius:12px;font-size:21px;background:rgba(120,160,255,.05);transition:.2s}
.zone:hover{border-color:var(--cy)}
.zone .slot{min-width:130px;min-height:52px;border:1px dashed var(--line2);border-radius:10px;display:flex;align-items:center;justify-content:center}
.zone.ok{border-color:var(--ok);background:rgba(75,227,160,.14)}.zone.bad{border-color:var(--red);background:rgba(255,111,114,.12)}
.zone small{display:none;font-family:var(--mono);font-size:15px;color:var(--ok);margin-left:auto}
.zone.bad small{display:block}
.locked .dchip{pointer-events:none}
.q-hint{font-family:var(--mono);font-size:14px;letter-spacing:.06em;color:var(--ink3);text-transform:uppercase}
.q-end{grid-column:1/-1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
.q-end .num{font-family:var(--mono);font-size:150px;font-weight:800;line-height:1;background:linear-gradient(100deg,#fff,#9be6ff 60%,#a98bff);-webkit-background-clip:text;background-clip:text;color:transparent}
.q-end .num small{font-size:60px}
.q-end p{font-size:26px;color:var(--ink2);margin:14px 0 8px;max-width:800px}
.q-end .q-dots{width:520px}
.q-end .btn-row{margin-top:20px}

/* ── финал ── */
.fin-title{font-size:62px;text-transform:uppercase;letter-spacing:.04em;background:linear-gradient(100deg,#fff 20%,#9be6ff 60%,#a98bff);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 30px rgba(85,217,255,.3))}
.fin-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.fin-card{border:1px solid var(--line);border-top:3px solid var(--c);border-radius:14px;background:var(--panel);padding:10px 20px 18px;text-align:center}
.fin-card canvas,.fin-card svg,.fin-ico{display:block;width:100%;height:250px}
.fin-ico svg{height:100%}
.fin-card b{display:block;font-family:var(--mono);font-size:22px;letter-spacing:.1em;text-transform:uppercase;color:var(--c)}
.fin-card p{font-size:18px;line-height:1.35;color:var(--ink2);margin-top:8px}
.fin-score{margin-top:22px;text-align:center;font-family:var(--mono);font-size:18px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink2);min-height:26px}
.fin-score b{color:var(--cy);font-size:24px}
.fin-quote{margin-top:14px;text-align:center;font-size:36px;font-weight:650;line-height:1.3}
.fin-actions{display:flex;gap:12px;justify-content:center;margin-top:22px}

/* ── оверлеи ── */
.overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:rgba(3,6,12,.84);backdrop-filter:blur(8px);z-index:20;display:flex;align-items:center;justify-content:center}
.overlay[hidden]{display:none}
.overlay-box{width:1180px;max-height:780px;border:1px solid var(--line2);border-radius:16px;background:#0a1122;padding:28px 34px;animation:rise .35s both}
.overlay-narrow{width:980px}
.overlay-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.overlay-head .kicker{font-size:20px}
.toc-list{display:grid;grid-template-columns:repeat(3,1fr);gap:8px 22px}
.toc-list button{display:flex;gap:14px;align-items:baseline;padding:11px 14px;border-radius:10px;text-align:left;font-size:20px;line-height:1.25;color:var(--ink2);transition:.15s;border:1px solid transparent}
.toc-list button i{font-style:normal;font-family:var(--mono);font-size:15px;color:var(--ink3)}
.toc-list button small{display:block;font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink3);margin-bottom:2px}
.toc-list button:hover{background:rgba(85,217,255,.1);color:#fff;border-color:var(--line2)}
.toc-list button.cur{border-color:var(--cy);color:#fff}
.notes-list{padding-left:26px;display:flex;flex-direction:column;gap:12px}
.notes-list li{font-size:20px;line-height:1.42;color:var(--ink2)}
.notes-list li::marker{font-family:var(--mono);color:var(--cy)}

@media (prefers-reduced-motion:reduce){.slide,.slide.active{transition:opacity .2s}.slide.active .rise{animation:none}}