:root{color-scheme:dark;--bg:#071014;--panel:#101f24;--line:#254249;--txt:#e9f7f0;--muted:#a4bcb9;--acid:#b9fb58;--cyan:#65e4df}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 78% 5%,#194340 0,transparent 38%),var(--bg);color:var(--txt);font:16px/1.55 system-ui,-apple-system,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}a:hover{color:var(--acid)}button,input,select{font:inherit}button{cursor:pointer}header{position:sticky;top:0;z-index:10;background:#081419ec;backdrop-filter:blur(15px);border-bottom:1px solid var(--line)}.bar{max-width:1240px;margin:auto;padding:15px 28px;display:flex;align-items:center;gap:30px}.brand{font-weight:850;letter-spacing:-.04em;font-size:1.3rem;color:var(--acid)}nav{display:flex;gap:23px;flex-wrap:wrap;font-size:.88rem}.right{margin-left:auto}.shell{max-width:1240px;padding:44px 28px 90px;margin:auto}.eyebrow{text-transform:uppercase;letter-spacing:.18em;color:var(--cyan);font-size:.75rem;font-weight:700}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:55px;align-items:end;padding:43px 0 72px;border-bottom:1px solid var(--line)}h1{font-size:clamp(3.2rem,7vw,7rem);line-height:.96;letter-spacing:-.075em;margin:20px 0 27px;font-weight:760}h2{font-size:clamp(2rem,4vw,3.7rem);letter-spacing:-.055em;line-height:1.1;margin:10px 0 25px}h3{font-size:1.3rem;margin:0 0 10px}.lead{font-size:1.23rem;color:#c3d9d5;max-width:650px}.heroaside{border:1px solid var(--line);background:linear-gradient(145deg,#143538,#0b1b21);padding:36px;min-height:380px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}.heroaside:before{content:'H₂O';position:absolute;right:-15px;top:-90px;font-size:11rem;color:#65e4df18;font-weight:800}.heroaside strong{font-size:3.8rem;line-height:1;color:var(--acid);letter-spacing:-.07em}.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 19px;border:1px solid var(--acid);background:var(--acid);color:#071014;font-weight:720;margin:10px 10px 0 0}.btn:hover{background:transparent;color:var(--acid)}.btn.secondary{background:transparent;color:var(--acid)}.btn.secondary:hover{background:var(--acid);color:#071014}.section{padding:65px 0;border-bottom:1px solid var(--line)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.card{border:1px solid var(--line);padding:25px;background:#0d1e23;transition:transform .25s,border-color .25s}.card:hover{transform:translateY(-4px);border-color:var(--cyan)}.card small,.meta{color:var(--muted)}.card .n{color:var(--acid);font-size:.78rem;letter-spacing:.13em}.card p{color:var(--muted)}.row{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:20px 0;border-bottom:1px solid var(--line)}.row:hover{color:var(--acid)}.row strong{display:block}.row small{display:block;color:var(--muted)}.row.disabled{opacity:.55}.pill{border:1px solid var(--line);padding:5px 9px;color:var(--cyan);font-size:.75rem;white-space:nowrap}.track{height:4px;background:#264044;margin-top:14px}.track i{display:block;height:100%;background:var(--acid)}.note{border-left:3px solid var(--acid);padding:18px 23px;background:#142a2c;margin:25px 0;color:#d8e9e4}.prose{max-width:760px;font-size:1.08rem;line-height:1.8}.prose h2{font-size:1.7rem;margin-top:2em}.prose a{color:var(--cyan);text-decoration:underline}.prose pre{overflow:auto}.quiz{max-width:800px}.question{padding:23px;border:1px solid var(--line);margin:15px 0;background:var(--panel)}.question label{display:block;padding:8px 0}.question input[type=text],.question input[type=number],.search input{padding:13px;background:#0b191d;border:1px solid #52716e;color:white;max-width:100%;width:100%}.question select{padding:8px;background:#0b191d;color:white;border:1px solid #52716e}.feedback{min-height:1.5em;color:var(--cyan)}details{border:1px solid var(--line);padding:18px;margin:10px 0;background:var(--panel)}summary{cursor:pointer;font-weight:700}.map{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.map .card{display:flex;justify-content:space-between;align-items:center}.map .card.locked{opacity:.68}footer{padding:40px 28px;color:var(--muted);max-width:1240px;margin:auto}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--acid);outline-offset:3px}@media(max-width:760px){.bar{gap:14px;padding:13px 18px;flex-wrap:wrap}.bar nav{order:3;width:100%;gap:14px}.right{margin-left:auto}.shell{padding:24px 18px 70px}.hero{grid-template-columns:1fr;gap:15px;padding:20px 0 48px}.heroaside{min-height:220px;padding:24px}.grid,.map{grid-template-columns:1fr}.section{padding:42px 0}h1{font-size:3.8rem}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}
@view-transition{navigation:auto}
::view-transition-old(root){animation:page-out .16s ease-out both}
::view-transition-new(root){animation:page-in .22s ease-out both}
html{background:var(--bg)}
[data-theme="light"]{color-scheme:light;--bg:#f7faf8;--panel:#fff;--line:#72968d;--txt:#091f19;--muted:#3d5b53;--acid:#356c00;--cyan:#00645f}
[data-theme="light"] body{background:radial-gradient(circle at 78% 4%,#b4ded3 0,transparent 36%),var(--bg)}
[data-theme="light"] header{background:#fffffff2;border-color:#88a9a1;box-shadow:0 12px 44px #173f351d}
[data-theme="light"] .lead{color:#24473e}[data-theme="light"] .eyebrow{color:#005c57}
[data-theme="light"] .hero h1{background-image:linear-gradient(105deg,#091f19 0%,#356c00 28%,#00645f 50%,#356c00 72%,#091f19 100%)}
[data-theme="light"] .card,[data-theme="light"] .question,[data-theme="light"] details,[data-theme="light"] .note{background:linear-gradient(135deg,#ffffffed,#e5f0ece8);border-color:#72968d;box-shadow:inset 0 1px #fff,0 18px 48px #173f351c}
[data-theme="light"] .heroaside{background:linear-gradient(145deg,#ffffffef,#dcebe6ed);border-color:#397d70;box-shadow:0 25px 70px #173f3526,inset 0 1px #fff}
[data-theme="light"] .benzene-mark:before{background:#f7fcfa}
[data-theme="light"] .btn{color:#fff}[data-theme="light"] .btn.secondary{color:var(--acid)}[data-theme="light"] .btn.secondary:hover{color:#fff}
[data-theme="light"] .question input[type=text],[data-theme="light"] .question input[type=number],[data-theme="light"] .search input,[data-theme="light"] .question select{background:#fff;color:var(--txt);border-color:#7d9e96}
[data-theme="light"] .page-wipe{background:#a7d64a}
body{overflow-x:hidden}
body:before,body:after{content:"";position:fixed;z-index:-2;pointer-events:none;border-radius:50%;filter:blur(90px);opacity:.28;will-change:transform}
body:before{width:38rem;height:38rem;left:-13rem;top:18vh;background:#0ddfc6;animation:orb-a 18s ease-in-out infinite alternate}
body:after{width:32rem;height:32rem;right:-10rem;top:45vh;background:#9cff35;animation:orb-b 22s ease-in-out infinite alternate}
.noise{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.19;background-image:linear-gradient(#ffffff05 1px,transparent 1px),linear-gradient(90deg,#ffffff05 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(to bottom,black,transparent 90%)}
.cursor-glow{position:fixed;z-index:-1;width:26rem;height:26rem;border-radius:50%;pointer-events:none;background:radial-gradient(circle,#5fffe51a,transparent 67%);transform:translate3d(calc(var(--mx,50vw) - 50%),calc(var(--my,30vh) - 50%),0);transition:transform .22s ease-out}
.reading-progress{position:fixed;z-index:80;left:0;top:0;width:var(--read,0%);height:2px;background:linear-gradient(90deg,var(--cyan),var(--acid));box-shadow:0 0 14px var(--acid);transition:width .08s linear}
.brand{display:inline-flex;align-items:center;gap:.72rem;letter-spacing:.08em;font-size:.92rem}
.benzene-mark{position:relative;display:block;width:2.8rem;height:2.45rem;background:var(--acid);clip-path:polygon(25% 0,75% 0,100% 50%,75% 100%,25% 100%,0 50%);filter:drop-shadow(0 0 5px #b9fb58) drop-shadow(0 0 13px #b9fb5899);transition:.45s cubic-bezier(.16,1,.3,1)}
.benzene-mark:before{content:"";position:absolute;inset:3px;background:#081419;clip-path:inherit}
.benzene-mark:after{content:"";position:absolute;width:1.08rem;height:1.08rem;left:50%;top:50%;transform:translate(-50%,-50%);border:2px solid var(--cyan);border-radius:50%;box-shadow:0 0 7px var(--cyan),inset 0 0 7px #65e4df88}
.brand:hover .benzene-mark{transform:rotate(60deg) scale(1.08);filter:drop-shadow(0 0 8px #b9fb58) drop-shadow(0 0 20px #b9fb58cc)}
.brand-copy{line-height:1.05}.brand-copy b{display:block;color:var(--txt);font-size:.92rem}.brand-copy small{display:block;color:var(--cyan);font-size:.63rem;letter-spacing:.18em;margin-top:.26rem}
.header-actions{display:flex;align-items:center;gap:.55rem;margin-left:auto}.theme-toggle,.menu-toggle{min-height:44px;border:1px solid var(--acid);border-radius:999px;background:color-mix(in srgb,var(--acid) 9%,transparent);color:var(--acid);padding:.62rem 1rem;font-weight:800;box-shadow:0 0 0 1px #b9fb5817,inset 0 0 14px #b9fb580d,0 0 18px #b9fb581a;transition:color .25s,background .25s,box-shadow .25s,transform .25s}.theme-toggle:hover,.menu-toggle:hover,.theme-toggle:focus-visible,.menu-toggle:focus-visible{border-color:var(--acid);background:var(--acid);color:#071014;box-shadow:0 0 10px #b9fb5899,0 0 28px #b9fb5866;transform:translateY(-1px)}.theme-toggle[aria-pressed="true"],.menu-toggle[aria-expanded="true"]{background:var(--acid);color:#071014;box-shadow:0 0 12px #b9fb58aa,0 0 32px #b9fb5870}.menu-toggle{display:none}.bar nav a{padding:.45rem .7rem;border-radius:999px;transition:background .25s,color .25s,box-shadow .25s}.bar nav a:hover{background:color-mix(in srgb,var(--acid) 12%,transparent);color:var(--acid);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--acid) 30%,transparent)}
[data-theme="light"] .theme-toggle:hover,[data-theme="light"] .menu-toggle:hover,[data-theme="light"] .theme-toggle[aria-pressed="true"],[data-theme="light"] .menu-toggle[aria-expanded="true"]{color:#fff}
::selection{background:#b9fb58;color:#071014;text-shadow:none}
header{box-shadow:0 12px 44px #0006}
.shell{animation:content-enter .8s cubic-bezier(.16,1,.3,1) both}
h1{letter-spacing:-.035em}.hero{perspective:1000px}.hero h1{letter-spacing:-.025em;background:linear-gradient(105deg,#fff 0%,#b9fb58 25%,#65e4df 50%,#b9fb58 75%,#fff 100%);background-size:220% auto;background-clip:text;color:transparent;animation:title-shine 9s ease-in-out infinite both}
.heroaside{border-color:#65e4df55;background:linear-gradient(145deg,#143538aa,#0b1b21bb);backdrop-filter:blur(20px) saturate(150%);box-shadow:0 25px 70px #0008,inset 0 1px #ffffff16;transform-style:preserve-3d;animation:float-panel 7s ease-in-out infinite}
.heroaside:before{display:none}
.heroaside:after{content:"";position:absolute;inset:-60%;background:conic-gradient(from 90deg,transparent,#65e4df20,transparent 32%);animation:scan 9s linear infinite}
.heroaside>*{position:relative;z-index:1}
.hero-benzene{position:absolute!important;z-index:0!important;right:-3.4rem;top:-2.2rem;width:18rem;height:15.6rem;background:#65e4df2b;clip-path:polygon(25% 0,75% 0,100% 50%,75% 100%,25% 100%,0 50%);filter:drop-shadow(0 0 18px #65e4df35);animation:logo-pulse 5s ease-in-out infinite}.hero-benzene:before{content:"";position:absolute;inset:6px;background:#0d2223;clip-path:inherit}.hero-benzene:after{content:"";position:absolute;width:7rem;height:7rem;left:50%;top:50%;transform:translate(-50%,-50%);border:3px solid #65e4df42;border-radius:50%;box-shadow:0 0 22px #65e4df27,inset 0 0 18px #65e4df1d}[data-theme="light"] .hero-benzene:before{background:#e7f0ed}
.about-gateway{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 0;color:var(--txt);font-size:clamp(2.35rem,5vw,4.6rem);font-weight:820;line-height:.98;letter-spacing:-.025em}.about-gateway span{transition:transform .4s cubic-bezier(.16,1,.3,1),color .3s,text-shadow .3s}.about-gateway .gateway-arrow{display:flex;align-items:center;justify-content:center;width:3.3rem;height:3.3rem;flex:none;border:1px solid var(--acid);border-radius:50%;font:700 1.45rem/1 Arial,sans-serif;color:var(--acid);box-shadow:0 0 18px #b9fb5838;padding:.02rem 0 .12rem .04rem}.about-gateway:hover{color:var(--acid)}.about-gateway:hover span:first-child{transform:translateX(.3rem);text-shadow:0 0 22px #b9fb584f}.about-gateway:hover .gateway-arrow{transform:translate(.12rem,-.12rem);background:var(--acid);color:#071014;box-shadow:0 0 28px #b9fb5875}.gateway-copy{max-width:29rem;color:var(--muted);font-size:1rem}
.card,.question,details,.note{background:linear-gradient(135deg,#13272ecc,#09161bbb);backdrop-filter:blur(22px) saturate(145%);-webkit-backdrop-filter:blur(22px) saturate(145%);box-shadow:inset 0 1px #ffffff14,0 18px 48px #0005}
.card{position:relative;overflow:hidden;isolation:isolate;transform:translateY(0);transition:transform .55s cubic-bezier(.16,1,.3,1),border-color .35s,box-shadow .55s}
.card:before{content:"";position:absolute;z-index:-1;inset:0;background:radial-gradient(22rem circle at var(--cx,50%) var(--cy,50%),#65e4df20,transparent 45%);opacity:0;transition:opacity .35s}
.card:after{content:"";position:absolute;inset:0;border:1px solid transparent;background:linear-gradient(115deg,transparent,#dfffb866,transparent) border-box;mask:linear-gradient(#000 0 0) padding-box,linear-gradient(#000 0 0);mask-composite:exclude;transform:translateX(-110%);transition:transform .8s}
.card:hover{transform:translateY(-9px) scale(1.015);box-shadow:0 26px 75px #0009,0 0 35px #65e4df1f}.card:hover:before{opacity:1}.card:hover:after{transform:translateX(110%)}
.track{overflow:hidden;border-radius:99px;box-shadow:inset 0 0 8px #000}.track i{width:0!important;transform-origin:left;box-shadow:0 0 13px var(--acid);transition:width 1.45s cubic-bezier(.16,1,.3,1)}.track.is-visible i{width:var(--progress)!important}
.row{position:relative;transition:padding .35s,color .35s,background .35s}.row:hover{padding-left:14px;background:linear-gradient(90deg,#65e4df10,transparent)}
.reveal{opacity:0;transform:translateY(35px);filter:blur(8px);transition:opacity .8s cubic-bezier(.16,1,.3,1),transform .8s cubic-bezier(.16,1,.3,1),filter .8s}.reveal.visible{opacity:1;transform:none;filter:none}
.page-wipe{position:fixed;z-index:100;inset:0;pointer-events:none;background:#b9fb58;transform:scaleY(0);transform-origin:bottom;will-change:transform}.transition-arrival .page-wipe{transform:scaleY(1)}.page-wipe.go{animation:cover-page .11s ease-in forwards}.page-wipe.arrive{transform:scaleY(1);transform-origin:top;animation:reveal-page .2s ease-out forwards}
.odptag{display:inline-flex;align-items:center;gap:.9rem;margin-top:1.5rem;color:var(--muted)}.odptag .benzene-mark{width:2.5rem;height:2.2rem;flex:none}.odptag b{color:var(--txt)}
/* Spacious, collision-proof layout for long Russian labels. */
.shell{min-width:0}
.hero{gap:clamp(36px,5vw,72px)}
.section{padding:clamp(62px,7vw,92px) 0}
.grid,.map{gap:clamp(20px,2.5vw,32px);min-width:0}
.grid>*,.map>*{min-width:0}
.map{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{min-width:0;padding:clamp(28px,3vw,40px);overflow-wrap:anywhere;word-break:normal}
.map .card{display:block;align-items:initial;justify-content:initial}
.card .n{display:block;margin:0 0 1rem;line-height:1.45}
.card h3{margin:0 0 .95rem;line-height:1.25;letter-spacing:-.015em}
.card p{margin:0 0 1.4rem;line-height:1.68}
.card small{display:block;line-height:1.55}
.card .track{margin-top:1.15rem}
.row{gap:clamp(24px,4vw,52px);min-width:0}
.row>span:first-child,.row>div{min-width:0;overflow-wrap:anywhere}
.row strong{display:block;margin-bottom:.35rem;line-height:1.38}
.question,details,.note{padding:clamp(24px,3vw,36px)}
h2,h3,.gateway-copy,.prose{overflow-wrap:anywhere;word-break:normal}
@keyframes content-enter{from{opacity:0;transform:translateY(18px);filter:blur(6px)}to{opacity:1;transform:none;filter:none}}
@keyframes page-out{to{opacity:0}}@keyframes page-in{from{opacity:0}}
@keyframes title-shine{0%,100%{background-position:0% center;filter:drop-shadow(0 0 0 transparent)}50%{background-position:100% center;filter:drop-shadow(0 0 12px #65e4df32)}}@keyframes float-panel{0%,100%{transform:translateY(0) rotateX(0) rotateY(0)}50%{transform:translateY(-8px) rotateX(1deg) rotateY(-1deg)}}@keyframes scan{to{transform:rotate(360deg)}}
@keyframes logo-pulse{50%{opacity:.62;transform:scale(1.045) rotate(3deg);filter:drop-shadow(0 0 18px #65e4df66)}}
@keyframes orb-a{to{transform:translate(25vw,22vh) scale(1.25)}}@keyframes orb-b{to{transform:translate(-20vw,-14vh) scale(.8)}}
@keyframes cover-page{to{transform:scaleY(1)}}@keyframes reveal-page{to{transform:scaleY(0)}}
@media(max-width:760px){
  .bar{display:grid;grid-template-columns:1fr auto auto;gap:.55rem;padding:10px 14px}.brand-copy small{display:none}.brand-copy b{font-size:.82rem}.benzene-mark{width:2.3rem;height:2rem}.header-actions{display:contents}.menu-toggle{display:block}.theme-label{display:none}
  .bar nav{grid-column:1/-1;order:4;display:grid;grid-template-columns:1fr 1fr;width:100%;max-height:0;overflow:hidden;opacity:0;gap:0;background:color-mix(in srgb,var(--panel) 86%,transparent);backdrop-filter:blur(24px);border:0 solid var(--line);padding:0;transition:max-height .45s cubic-bezier(.16,1,.3,1),opacity .3s,padding .35s,border-width .35s}
  header.nav-open nav{max-height:18rem;opacity:1;padding:.45rem;border-width:1px}.bar nav a{min-height:48px;display:flex;align-items:center;padding:.7rem;border-bottom:1px solid var(--line)}
  .cursor-glow{display:none}.shell{padding:24px 16px 64px}.hero{grid-template-columns:1fr;gap:28px;padding:18px 0 44px}.hero h1,h1{font-size:clamp(3rem,16vw,4.5rem);letter-spacing:-.02em}.heroaside{min-height:245px;padding:24px;animation:none}.heroaside strong{font-size:3.2rem}
  .grid,.map{grid-template-columns:1fr;gap:18px}.card{padding:26px 24px;min-height:0}.card h3{line-height:1.28}.card p{margin-bottom:1.25rem}.section{padding:52px 0}.btn{width:100%;min-height:48px;margin:10px 0 0}.row{align-items:flex-start;flex-direction:column;gap:14px;padding:22px 4px}.row .pill{align-self:flex-start}.lead{font-size:1.08rem;line-height:1.65}.prose{font-size:1rem;line-height:1.75;overflow-wrap:anywhere}.question,details,.note{padding:22px 20px}.question label{min-height:44px;padding:12px 0}.odptag{align-items:flex-start}footer{padding:34px 16px}.right{margin:0}
}
@media(min-width:761px) and (max-width:980px){.bar{flex-wrap:wrap;gap:16px 22px;padding-block:14px}.bar nav{order:3;width:100%;justify-content:space-between;gap:14px}.theme-label{display:none}.hero{grid-template-columns:1fr 1fr;gap:34px}.grid,.map{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.card{padding:28px}.section{padding:64px 0}}
@media(prefers-reduced-motion:reduce){::view-transition-old(root),::view-transition-new(root),.shell,.hero h1,.heroaside,.heroaside:after,body:before,body:after{animation:none!important}.reveal{opacity:1;transform:none;filter:none}.track i{transition:none}.page-wipe{display:none}}