/* Учебная среда, «Опыт крупным планом»: компоненты всех типов страниц. Токены в tokens.css. 17.10.2026, дизайнер-сайтов.
   Две поверхности: сцена (тёмная, светлый текст) и бумага (.paper, .sheet и формы инструментов) — на бумаге переопределяются те же переменные. */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;background:var(--night)}
body{margin:0;background:var(--night);color:var(--ink);font:400 var(--fs-body)/var(--lh-body) var(--f-text);position:relative;overflow-x:hidden;font-variant-numeric:tabular-nums}
img,svg{max-width:100%;height:auto}
img{display:block}
a{color:var(--link);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--lime);outline-offset:2px}
h1,h2{font-family:var(--f-display);font-weight:800;line-height:1.08;letter-spacing:-.025em;text-wrap:balance;margin:0;color:var(--ink)}
h3{font:700 1.125rem/1.3 var(--f-text);margin:0;color:var(--ink)}
h1{font-size:var(--fs-h1);overflow-wrap:break-word}
h2{font-size:var(--fs-h2)}
h1 em,h2 em{font-style:normal;color:var(--lime)}
p{margin:0 0 .8em}
ul,ol{padding-left:1.4em}
li{margin:.35em 0}
b,strong{font-weight:700}
small,.meta,.muted{font:400 var(--fs-small)/1.5 var(--f-text);color:var(--mute)}
.nw,.u{white-space:nowrap}
.wrap,.shell{max-width:var(--wrap);margin:0 auto;padding:0 56px;position:relative;z-index:2}
.skip,.skip-link{position:absolute;left:-999px;top:0;background:var(--lime);color:var(--on-lime);padding:10px 16px;z-index:30;font:700 1rem/1 var(--f-text)}
.skip:focus,.skip-link:focus{left:16px}
[hidden]{display:none!important}

/* бумага: те же переменные, светлые значения */
.paper,.sheet,.tool-section,.lesson-form,.lesson-preview,.pdf-preview img,.consent-paper{
  --ink:var(--p-ink);--mute:var(--p-mute);--line:var(--p-line);--link:var(--p-link);--field:var(--p-field);color:var(--ink)}
.paper,.tool-section,.lesson-form,.lesson-preview{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:36px 40px}

/* сцена раздела: картинка справа, затемнение слева как в концепте (0,95 → 0,84 на 38 % → 0 на 60 %) */
.scene{position:absolute;left:0;right:0;top:0;height:var(--scene-h);overflow:hidden;z-index:0;pointer-events:none}
.scene img{position:absolute;right:0;top:0;width:min(100%,1600px);height:100%;object-fit:cover;object-position:100% 50%}
.scene::before{content:"";position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,rgba(6,19,18,.8) 0,rgba(6,19,18,0) 150px),linear-gradient(90deg,rgba(6,19,18,.95) 0%,rgba(6,19,18,.84) 38%,rgba(6,19,18,0) 60%),linear-gradient(0deg,var(--night) 0%,rgba(6,19,18,0) 45%)}
@media (min-width:1601px){.scene::after{content:"";position:absolute;top:0;bottom:0;right:1600px;width:120px;margin-right:-120px;background:linear-gradient(90deg,var(--night),rgba(6,19,18,0));z-index:1}}

/* шапка: лаймовое кольцо, три раздела */
.top{position:relative;z-index:5;height:var(--top-h)}
.top .wrap{display:flex;align-items:center;gap:12px 36px;height:100%}
.logo{display:flex;align-items:center;gap:12px;font:800 1.1875rem/1 var(--f-display);letter-spacing:-.01em;color:var(--ink);text-decoration:none;white-space:nowrap;min-height:var(--tap)}
.logo i{flex:0 0 30px;width:30px;height:30px;border-radius:50%;background:var(--lime);box-shadow:0 0 22px rgba(212,255,58,.55);position:relative}
.logo i::after{content:"";position:absolute;left:9px;top:9px;width:12px;height:12px;border-radius:50%;background:var(--night)}
.nav{display:flex;gap:0 28px;margin-left:auto;font:700 1rem/1 var(--f-text)}
.nav a{color:var(--mute);text-decoration:none;min-height:var(--tap);display:inline-flex;align-items:center;border-bottom:2px solid transparent;white-space:nowrap}
.nav a:hover{color:var(--ink)}
.nav a[aria-current]{color:var(--ink);border-color:var(--lime)}

/* крошки, кикер, шапка страницы */
.crumbs,.breadcrumbs{font:400 var(--fs-small)/1.45 var(--f-text);color:var(--mute);padding:8px 0 0;margin:0}
.crumbs a,.breadcrumbs a{color:var(--mute)}
.crumbs [aria-current]{color:var(--ink)}
.kicker{display:inline-flex;gap:10px;align-items:center;font:700 .8125rem/1.2 var(--f-text);letter-spacing:.16em;text-transform:uppercase;color:var(--lime);margin:0}
.kicker::before{content:"";flex:0 0 34px;height:2px;background:var(--lime)}
.page-head{position:relative;z-index:2;padding-top:18px;max-width:640px}
.page-head h1{margin-top:14px}
.page-head .kicker+h1{margin-top:16px}
.page-head>p:not(.kicker):not(.dates),.lead{font-size:1.125rem;color:var(--mute);max-width:36em;margin:16px 0 0}
.page-head>p b,.lead b{color:var(--ink)}
.title-row{display:flex;gap:18px;align-items:flex-start;margin-top:14px}
.title-row h1{flex:1;min-width:0;margin:0}
.dates{font:400 var(--fs-small)/1.5 var(--f-text);color:var(--mute);margin:12px 0 0}
.page-head .next-sheet{margin:8px 0 0}
.sec{margin-top:var(--section)}
.sec>h2,.sec-head{margin-bottom:var(--block)}
.sec-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px 20px;flex-wrap:wrap}
.sec-head h2{margin:0}
.sec-head a{font:700 1rem/1.3 var(--f-text)}
.prose{max-width:var(--measure)}
.prose h2,.paper h2{margin:var(--section) 0 14px}
.prose h2:first-child,.paper>h2:first-child,.paper>section:first-child>h2:first-child{margin-top:0}
.prose h3,.paper h3{margin:24px 0 8px}

/* паспорт листа: плитка 72 px у H1 */
.plaque{flex:0 0 72px;width:72px;height:72px;border-radius:12px;background:var(--night-2);box-shadow:inset 0 0 0 1.5px rgba(212,255,58,.55);display:grid;grid-template-rows:auto 1fr auto;padding:5px 7px;color:var(--ink)}
.plaque .pl-top,.plaque .pl-bot{font:700 .6875rem/1.1 var(--f-text);color:var(--mute)}
.plaque .pl-bot{text-align:right}
.plaque b{display:grid;place-items:center;font:700 1.75rem/1 var(--f-text);color:var(--lime)}

/* кнопки: лаймовая главная, остальные контуром; на бумаге контурная становится тёмной */
.actions,.btns{display:flex;flex-wrap:wrap;gap:12px;margin:0}
.page-head .actions{margin-top:24px}
.btn,button,.button,.file-button{font:700 1rem/1.1 var(--f-text);min-height:var(--tap);padding:0 20px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;cursor:pointer;text-align:center;
  border:0;background:rgba(234,244,241,.06);color:var(--ink);box-shadow:inset 0 0 0 1.5px rgba(234,244,241,.4)}
.btn-main,#export-missing,.consent #consent-yes{background:var(--lime);color:var(--on-lime);box-shadow:0 0 0 1px rgba(212,255,58,.4),0 14px 40px rgba(212,255,58,.22)}
.btn-main{min-height:var(--btn-h);font-size:1.0625rem;padding:0 26px;border-radius:14px}
.btn-main small{font:400 .9375rem/1 var(--f-text);opacity:.8;color:inherit}
.btn:hover,button:hover{box-shadow:inset 0 0 0 2px var(--ink)}
.btn-main:hover,#export-missing:hover{box-shadow:0 0 0 2px var(--ink),0 14px 40px rgba(212,255,58,.3)}
.paper .btn:not(.btn-main),.sheet .btn:not(.btn-main),.tool-section button:not(#export-missing):not(.text-button),.lesson-form button:not(.text-button),.paper button:not(.text-button),.file-button{background:var(--p-ink);color:#fff;box-shadow:none}
.btn-pen[aria-pressed=true]{box-shadow:inset 0 0 0 1.5px var(--lime);color:var(--lime)}
.sheet .btn-pen[aria-pressed=true]{color:#fff;box-shadow:inset 0 0 0 2px var(--pen)}
.text-button,button.text-button{background:none;box-shadow:none;color:var(--link);text-decoration:underline;padding:0 4px;min-height:var(--tap)}
.js-only{display:none}
.js .js-only{display:inline-flex}
.file-button input{position:absolute;width:1px;height:1px;opacity:0}
.file-button{position:relative}

/* таблицы: цифры Manrope с tnum; лист — фиксированная раскладка, первый столбец 13 % */
.scroll,.table-wrap,.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
table{border-collapse:collapse;width:100%;font:400 .9375rem/1.4 var(--f-text);font-variant-numeric:tabular-nums;color:var(--ink)}
th,td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top}
thead th{font-weight:700;font-size:.8125rem;line-height:1.2;color:var(--mute);vertical-align:bottom;border-bottom:2px solid var(--ink);white-space:nowrap}
tbody th{font-weight:700}
td.n,th.n{text-align:right}
.num{font-variant-numeric:tabular-nums}
sub,sup{line-height:0;font-size:.72em}
table.fx{table-layout:fixed}
table.fx col.c1{width:13%}
table.fx th,table.fx td{text-align:center;padding:8px 2px}
table.fx thead th{white-space:normal;line-height:1.1;padding:4px 2px 6px}
.scroll-hint{display:none;font:400 var(--fs-small)/1.4 var(--f-text);color:var(--mute);margin:4px 0 0}

/* ответы: рукописные красные; в HTML есть всегда, прячет CSS при работающем JS */
.ans{color:var(--pen-text);font:700 1.5rem/1 var(--f-hand)}
.ans::after{content:"✓";font:700 .8125rem/1 var(--f-text);margin-left:2px;vertical-align:.35em}
.ans-block{color:var(--pen-text);font:700 1.375rem/1.25 var(--f-hand);margin:10px 0 0}
.ans-block p{margin:.3em 0}
.ans-block b,.ans-block strong{font-weight:700}
.js .answers-hidden .ans,.js .answers-hidden .ans-block{display:none}
.js .home-sheet.answers-hidden .ans{display:inline;visibility:hidden}
.js .home-sheet.answers-hidden .ans-block{display:block;visibility:hidden}
.js .home-sheet.answers-hidden .score{visibility:hidden}

/* лист: бумага в сцене */
.sheet{position:relative;background:var(--paper);border-radius:10px;padding:26px 28px 24px;box-shadow:var(--shadow)}
.grid-paper{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='22' height='22'%3E%3Cpath d='M21.5 0V21.5H0' fill='none' stroke='%23E6EBE9'/%3E%3C/svg%3E");background-size:22px 22px}
.sheet-head{display:flex;justify-content:space-between;flex-wrap:wrap;gap:4px 12px;font:700 .75rem/1.3 var(--f-text);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);margin:0 0 10px}
.sheet-head .dates{margin:0;text-transform:none;letter-spacing:0;font-weight:400}
.sheet h2{font-size:1.5rem;margin:6px 0 4px}
.sheet h3{font:700 1rem/1.35 var(--f-text);margin:22px 0 10px}
.sheet p{margin:4px 0}
.sheet .note{font-size:var(--fs-small);color:var(--mute);margin:10px 0}
.line{height:30px;border-bottom:1px solid var(--p-field)}
.diagram{display:block;margin:12px 0 4px;max-width:520px;color:var(--ink)}
.formula-tag{position:absolute;z-index:3;font:700 1.125rem/1 var(--f-text);background:var(--lime);color:var(--on-lime);padding:10px 14px;border-radius:12px;transform:rotate(-8deg);box-shadow:0 12px 30px rgba(0,0,0,.4);white-space:nowrap}
.score{display:inline-block;font:700 1.375rem/1 var(--f-hand);color:var(--pen-text);transform:rotate(-4deg);border:2px solid var(--pen);border-radius:10px;padding:5px 10px}
.sheet-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:14px;flex-wrap:wrap}

/* ячейка самопроверки */
.chk{white-space:nowrap}
.sheet td.chk input{display:block;margin:0 auto;min-height:36px;width:100%;max-width:4.6em;height:36px;border:1.5px solid var(--p-field);border-radius:6px;background:#fff;color:var(--ink);font:400 1rem/1 var(--f-text);text-align:center;padding:0 4px}
.chk .mk{display:inline-block;width:14px;margin-top:4px;vertical-align:middle}
.chk .ans{display:block;margin-top:4px}
.sheet .chk.is-ok input{border-color:var(--ok);background:var(--good-bg)}
.chk.is-ok .mk{height:8px;border-left:2.5px solid var(--ok);border-bottom:2.5px solid var(--ok);transform:rotate(-45deg) translateY(-3px)}
.sheet .chk.is-bad input{border-color:var(--pen-text);background:var(--pen-bg)}
.chk.is-bad .mk::before{content:"×";color:var(--pen-text);font:700 1.25rem/1 var(--f-text)}
.check-row-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:14px}
.check-result{font:700 1rem/1.4 var(--f-text);margin:0}
.check-result.bad{color:var(--pen-text)}
.check-result.good{color:var(--ok)}

/* страница листа и материала: колонка бумаги + правая колонка на сцене */
.layout{display:grid;gap:var(--section);margin-top:40px;position:relative;z-index:2}
.layout>*{min-width:0}
.main-col{display:grid;gap:28px;min-width:0}
.rail{font:400 1rem/1.5 var(--f-text)}
.rail h2{font-size:1.0625rem;margin:0 0 12px}
.rail>*+h2{margin-top:28px}
.rail ul{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.rail li{border-bottom:1px solid var(--line);padding:12px 0;margin:0}
.rail li span{display:block;color:var(--mute);font-size:var(--fs-small)}
.rail table{font-size:.9375rem}
.pdf-preview{margin:0 0 var(--block)}
.pdf-preview img{border-radius:6px;background:#fff;width:100%;max-width:300px;aspect-ratio:210/297;object-fit:cover;object-position:top;box-shadow:var(--shadow);transform:rotate(2deg)}
.pdf-preview figcaption{margin-top:14px}
.rule-box{border:2px solid var(--lime);border-radius:12px;padding:12px 16px;margin:12px 0}
.paper .rule-box{border-color:var(--p-ink)}
.formula{font:700 1.5rem/1.3 var(--f-text);margin:4px 0}
.sticky-dl{position:fixed;left:0;right:0;bottom:var(--consent-h,0px);background:rgba(6,19,18,.94);backdrop-filter:blur(8px);border-top:1px solid var(--line);padding:10px 16px;display:flex;gap:12px;z-index:8}
.sticky-dl .btn{flex:1}
@media (min-width:900px){
  .layout{grid-template-columns:minmax(0,1fr) 300px;align-items:start}
  .rail{position:sticky;top:24px}
  .sticky-dl{display:none!important}
}
@media (max-width:899px){.rail .pdf-preview img{max-width:220px}}

/* текст материала на бумаге */
.article-body{max-width:var(--measure)}
.article-body h2{margin:var(--section) 0 14px}
.article-body h2:first-child{margin-top:0}
.article-body h3{margin:var(--block) 0 8px}
.article-body table{margin:12px 0}
.article-body figure{margin:var(--block) 0}
.article-body figcaption{font-size:var(--fs-small);color:var(--mute);margin-top:8px}
.article-body .worksheet{border:1px solid var(--line);border-radius:10px;padding:18px;margin:var(--block) 0;background-color:#fff;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='22' height='22'%3E%3Cpath d='M21.5 0V21.5H0' fill='none' stroke='%23E6EBE9'/%3E%3C/svg%3E");background-size:22px 22px;overflow-x:auto}
.article-body .drawing-space{min-height:160px;border:1.5px dashed var(--p-field);border-radius:8px;margin:12px 0;padding:8px;color:var(--mute)}
.article-body .graph,.article-body .displacement{display:block;width:100%;max-width:620px;height:auto;margin:var(--block) 0}
.small-note,.article-body .small-note{font-size:var(--fs-small);color:var(--mute);overflow-wrap:anywhere}
.article-body .writing-lines div{height:30px;border-bottom:1px solid var(--p-field)}
.sources,.related{max-width:var(--measure);margin-top:var(--section);font:400 1rem/1.55 var(--f-text)}
.sources h2,.related h2{font-size:1.125rem;margin:0 0 12px}
.sources li,.related li{margin:.5em 0}
.sources p{color:var(--mute);font-size:var(--fs-small)}
.related ul{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:10px}
.related li{margin:0}
.related a{display:inline-flex;align-items:center;min-height:var(--tap);padding:8px 14px;border-radius:999px;background:rgba(21,26,25,.06);box-shadow:inset 0 0 0 1px var(--line);text-decoration:none;font-weight:700;color:var(--ink)}
.related a:hover{box-shadow:inset 0 0 0 1.5px var(--ink)}
.toc ul{list-style:none;padding:0;margin:0}
.toc a{color:var(--ink);text-decoration:none}
.toc a:hover{color:var(--lime)}

/* карточки: превью настоящего листа на сцене */
.shelf{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 20px}
.shelf.wide{grid-template-columns:minmax(0,1fr)}
@media (min-width:700px){.shelf{grid-template-columns:repeat(3,minmax(0,1fr))}.shelf.wide{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:900px){.shelf{grid-template-columns:repeat(4,minmax(0,1fr))}.shelf.wide{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (min-width:1100px){.shelf{grid-template-columns:repeat(5,minmax(0,1fr))}}
.card{display:block;text-decoration:none;color:var(--ink);font-family:var(--f-text)}
.card img{width:100%;border-radius:8px;background:#fff;aspect-ratio:210/297;object-fit:cover;object-position:top;box-shadow:0 18px 40px rgba(0,0,0,.45);transition:transform .2s}
.card.wide img{aspect-ratio:760/480;border-radius:12px}
.card:hover img{transform:translateY(-4px) rotate(-1deg)}
.card b{display:block;font-weight:700;font-size:1.0625rem;line-height:1.3;margin-top:14px}
.card span{display:block;font-size:var(--fs-small);color:var(--mute);margin-top:4px;line-height:1.45}
.card:hover b{color:var(--lime)}
.card:focus-visible{outline-offset:6px}

/* главная: герой на весь экран из концепта В1 */
main{display:block;position:relative;z-index:2;min-height:calc(var(--scene-h) - var(--top-h))}
.home main{position:relative}
.hero{position:relative;overflow-x:clip;height:calc(100vh - var(--top-h));min-height:calc(760px - var(--top-h));max-height:calc(940px - var(--top-h))}
.stage{display:contents}
.stage>img.bg{position:absolute;left:0;right:0;top:calc(-1 * var(--top-h));width:100%;height:calc(100% + var(--top-h));object-fit:cover;object-position:100% 50%;z-index:0}
.hero::before{content:"";position:absolute;left:0;right:0;top:calc(-1 * var(--top-h));bottom:0;z-index:1;background:linear-gradient(90deg,rgba(6,19,18,.95) 0%,rgba(6,19,18,.84) 38%,rgba(6,19,18,0) 60%);pointer-events:none}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:90px;z-index:1;background:linear-gradient(0deg,var(--night),rgba(6,19,18,0));pointer-events:none}
.copy{position:relative;z-index:2;max-width:min(640px,calc(100% - 480px));padding:clamp(24px,5vh,56px) 0 0 56px}
.copy h1{font-size:clamp(2.25rem,1.2rem + 2.3vw,3.25rem);line-height:1.06;margin:22px 0}
.copy .lead{font-size:1.1875rem;margin:0}
.btns{margin-top:32px}
.chips{display:flex;gap:10px;margin-top:30px;flex-wrap:wrap;max-width:560px}
.chips a{display:inline-flex;align-items:center;min-height:40px;font:700 .875rem/1 var(--f-text);padding:0 14px;border-radius:999px;background:rgba(234,244,241,.07);box-shadow:inset 0 0 0 1px rgba(234,244,241,.18);color:var(--ink);text-decoration:none}
.chips a:hover{box-shadow:inset 0 0 0 1.5px var(--lime)}
.chips b{color:var(--lime);margin-left:6px}
.lab{position:absolute;z-index:2;right:40px;bottom:14px;width:430px}
.lab .back{position:absolute;right:-30px;top:-74px;width:300px;transform:rotate(8deg);border-radius:4px;box-shadow:0 30px 60px rgba(0,0,0,.55);opacity:.96}
.home-sheet{transform:rotate(-3deg);padding:22px 24px 20px}
.home-sheet .formula-tag{left:-64px;top:-34px}
.home-sheet h2{font-size:1.4375rem}
.home-sheet h3{margin:4px 0 10px;font:400 .875rem/1.3 var(--f-text);color:#33403D}
.home-sheet td{height:40px;vertical-align:middle}
.home-sheet .ans-block{font-size:1.125rem;margin-top:8px}
.home-sheet .open-full{display:inline-block;margin-top:10px;font:700 .875rem/1.3 var(--f-text)}
.home-sheet .btn{min-height:40px;padding:0 14px;font-size:.875rem;border-radius:10px}
.below{position:relative;z-index:2;padding-top:56px}
.before{display:grid;gap:16px;list-style:none;margin:20px 0 0;padding:0}
.board-band h2{margin-top:14px}
.before li{margin:0;background:var(--night-2);border-radius:var(--radius);padding:20px 22px;box-shadow:inset 0 0 0 1px var(--line)}
.before a{font:700 1.0625rem/1.3 var(--f-text);color:var(--ink);text-decoration:none}
.before a::before{content:"";display:block;width:26px;height:3px;background:var(--lime);margin-bottom:14px}
.before a:hover{color:var(--lime)}
.before span{display:block;color:var(--mute);font-size:var(--fs-small);margin-top:6px}
@media (min-width:900px){.before{grid-template-columns:repeat(3,1fr)}}
.packs td:first-child{font-weight:700}
.packs td.n{white-space:nowrap}
.board-band{position:relative;z-index:2;margin-top:64px;background:var(--night-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:56px 0}
.board-band .tools{display:grid;gap:var(--block);margin-top:24px}
.board-band .tool{border-radius:var(--radius);padding:22px;box-shadow:inset 0 0 0 1px var(--line);background:rgba(6,19,18,.55)}
.board-band .tool p{margin:8px 0 14px;font-size:1rem;color:var(--mute)}
.board-band .tool a{font-weight:700}
@media (min-width:900px){.board-band .tools{grid-template-columns:repeat(3,1fr)}}

/* каталог: поиск и фильтры-таблетки */
.search-label{display:block;font:700 1rem/1.4 var(--f-text);margin-top:24px;max-width:520px}
input[type=search],input[type=text],input[type=number],input:not([type]),textarea,select{display:block;width:100%;min-height:var(--tap);border:1.5px solid var(--field);border-radius:10px;background:rgba(234,244,241,.05);color:var(--ink);font:400 1rem/1.4 var(--f-text);padding:8px 12px;margin-top:6px}
.paper input,.paper textarea,.paper select,.tool-section input,.lesson-form input,.lesson-form textarea{background:#fff}
input::placeholder,textarea::placeholder{color:var(--mute);opacity:1}
textarea{min-height:88px}
.filters{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.filter{min-height:var(--tap);padding:0 16px;border-radius:999px;background:rgba(234,244,241,.07);box-shadow:inset 0 0 0 1px rgba(234,244,241,.22);font-size:.9375rem}
.filter.active,.filter[aria-pressed=true]{background:var(--lime);color:var(--on-lime);box-shadow:none}
.empty{color:var(--mute)}

/* инструменты: формы на бумаге */
.tool-section,.lesson-editor{margin-top:40px}
.tool-toolbar{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-bottom:14px}
.inventory-table{min-width:720px}
.inventory-table input{margin:0;min-height:40px;padding:6px 8px}
.inventory-table input[aria-invalid=true]{border-color:var(--pen-text);background:var(--pen-bg)}
.inventory-table output{display:block;text-align:right;padding-top:8px}
.tool-section .inventory-table td.no-print button{min-height:40px;padding:0 12px;background:#fff;color:var(--pen-text);box-shadow:inset 0 0 0 1.5px var(--pen-text);font-size:.9375rem}
.inventory-summary{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 20px;border-radius:10px;background:#EEF0EA;padding:14px 18px;margin:14px 0;font:400 1rem/1.4 var(--f-text)}
.tool-section .actions,.lesson-form .actions{margin-top:14px}
.status{font:400 1rem/1.4 var(--f-text);color:var(--ok);min-height:1.4em;margin:12px 0}
.status.error{color:var(--pen-text)}
details{margin-top:var(--block);border-top:1px solid var(--line);padding-top:12px}
summary{cursor:pointer;font:700 1rem/1.4 var(--f-text);color:var(--link);min-height:var(--tap);display:flex;align-items:center}
.tool-followup{margin-top:var(--section);max-width:var(--measure)}
.lesson-editor{display:grid;gap:28px}
.lesson-editor>*{min-width:0}
.lesson-form label{display:block;font:700 1rem/1.4 var(--f-text);margin:0 0 14px}
.lesson-form h2{margin:24px 0 12px}
.lesson-form .row{display:grid;gap:0 14px}
.check-row{display:flex!important;align-items:center;gap:10px;min-height:var(--tap)}
.check-row input{width:22px;height:22px;accent-color:var(--p-ink);margin:0;flex:0 0 22px;min-height:0}
.time-summary{font:700 1rem/1.4 var(--f-text)}
.lesson-preview h2{margin:0 0 8px}
.lesson-preview h3{margin:var(--block) 0 4px;font-size:1rem}
@media (min-width:700px){.lesson-form .row{grid-template-columns:1fr 1fr}}
@media (min-width:1000px){.lesson-editor{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);align-items:start}.lesson-preview{position:sticky;top:24px}}

/* служебные страницы: заголовок на сцене, текст на бумаге */
.shell.page-head{max-width:var(--wrap)}
.shell.page-head>*{max-width:640px}
.shell.tool-section{max-width:none;margin:40px max(56px,calc((100% - var(--wrap)) / 2 + 56px)) 0}
.paper.narrow{max-width:calc(var(--measure) + 80px)}
.service{margin-top:40px}
.paper figure img{border-radius:10px}

/* подвал */
.foot{position:relative;z-index:2;border-top:1px solid var(--line);margin-top:80px;padding:36px 0 48px;font:400 .9375rem/1.5 var(--f-text);color:var(--mute)}
.foot .logo{margin-bottom:14px;font-size:1rem}
.foot .logo i{flex-basis:24px;width:24px;height:24px}.foot .logo i::after{left:7px;top:7px;width:10px;height:10px}
.foot a,.foot .text-button{color:var(--mute)}
.foot p{margin:0 0 12px;max-width:var(--measure)}
.foot-links{display:flex;flex-wrap:wrap;gap:4px 24px;margin:0;padding:0;list-style:none}
.foot-links li{margin:0}
.foot-links a,.foot-links .text-button{display:inline-flex;align-items:center;min-height:var(--tap);padding:0;font:400 .9375rem/1.3 var(--f-text);box-shadow:none}
.board-band+.foot{margin-top:0}

/* полоса согласия Метрики: внизу, не выше 120 px, две кнопки одного веса */
.consent{position:fixed;left:0;right:0;bottom:0;z-index:10;background:rgba(12,33,31,.97);backdrop-filter:blur(8px);border-top:1px solid rgba(212,255,58,.35);padding:8px 16px}
.consent p{margin:0 0 6px;font:400 .9375rem/1.35 var(--f-text);color:var(--ink);max-width:720px}
.consent a{color:var(--lime)}
.consent div{display:flex;gap:12px}
.consent button{flex:1;min-height:var(--tap);padding:0 14px}
.consent #consent-yes{background:rgba(234,244,241,.06);color:var(--ink);box-shadow:inset 0 0 0 1.5px rgba(234,244,241,.4)}
@media (max-width:399px){.consent p{font-size:.875rem}}
@media (min-width:700px){.consent{display:flex;align-items:center;justify-content:center;gap:20px}.consent p{margin:0}.consent div{flex:0 0 auto}.consent button{flex:0 0 auto}}

/* телефон и планшет */
@media (max-width:820px){
  .wrap,.shell{padding:0 16px}
  .shell.tool-section{margin:28px 16px 0}
  .top .wrap{flex-wrap:wrap;align-content:center;gap:6px 0}
  .logo{font-size:1rem;gap:10px;min-height:36px}
  .logo i{flex-basis:24px;width:24px;height:24px}.logo i::after{left:7px;top:7px;width:10px;height:10px}
  .nav{margin-left:0;width:100%;gap:0 20px;font-size:.9375rem}
  .nav a{min-height:40px}
  .scene img{width:100%;object-position:72% 40%}
  .scene::before{background:linear-gradient(180deg,rgba(6,19,18,.68) 0%,rgba(6,19,18,.76) 55%,var(--night) 100%)}
  .page-head{padding-top:10px}
  h1{font-size:clamp(1.375rem,6.2vw,1.75rem)}
  .page-head>p:not(.kicker):not(.dates),.lead{font-size:1rem;margin-top:12px}
  .title-row{gap:12px}
  .plaque{flex-basis:60px;width:60px;height:60px;padding:4px 6px}.plaque b{font-size:1.4rem}
  .page-head .actions{margin-top:18px}
  .btn-main{flex:1 1 auto}
  .paper,.tool-section,.lesson-form,.lesson-preview{padding:22px 18px;border-radius:12px}
  .sheet{padding:18px 14px 16px}
  .layout{margin-top:28px}
  table{font-size:.875rem}
  th,td{padding:8px 6px}
  /* главная на телефоне: текст, затем полоса картинки 330 px, лист заходит на неё */
  .hero{height:auto;min-height:0;max-height:none;padding-bottom:20px}
  .hero::before,.hero::after{display:none}
  .copy{max-width:none;padding:6px 16px 0}
  .kicker{font-size:.6875rem}
  .copy h1{font-size:1.625rem;margin:10px 0}
  .copy .lead{font-size:1rem}
  .btns{margin-top:18px;gap:10px}
  .btns .btn{flex:1 1 auto;padding:0 14px}.btn-main small{display:none}
  .chips{margin-top:16px;gap:8px}.chips a{font-size:.8125rem;padding:0 11px;min-height:36px}
  .stage{display:block;position:relative;margin-top:22px;padding-top:240px}
  .stage>img.bg{top:0;height:330px;object-position:68% 40%;-webkit-mask:linear-gradient(180deg,#000 70%,transparent);mask:linear-gradient(180deg,#000 70%,transparent)}
  .lab{position:relative;right:auto;bottom:auto;width:auto;margin:0 16px}
  .lab .back{width:140px;right:-4px;top:-46px}
  .home-sheet{transform:rotate(-1.5deg);padding:18px 14px 16px}
  .home-sheet h2{font-size:1.1875rem}
  .home-sheet .formula-tag{left:auto;right:12px;top:-22px;font-size:.9375rem}
  table.fx thead th{font-size:.71875rem}
  .home-sheet .ans,.sheet .ans{font-size:1.3125rem}
  .below{padding-top:36px}
  .board-band{margin-top:48px;padding:40px 0}
}
@media (max-width:479px){.scroll-hint{display:block}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* печать HTML-страницы: только содержание, чёрным по белому, без сцены, шапки и кнопок */
@media print{
  @page{size:A4;margin:15mm}
  :root{--ink:#000;--mute:#333;--line:#999;--link:#000;--p-ink:#000;--p-mute:#333}
  html,body{background:#fff!important;color:#000;font-size:11pt;line-height:1.45}
  .scene,.stage>img.bg,.lab .back,.formula-tag,.hero::before,.hero::after,.top,.foot,.consent,.sticky-dl,.actions,.btns,.chips,.kicker,.no-print,.crumbs,.breadcrumbs,.rail,.skip,.skip-link,.check-row-actions,.tool-toolbar,.lesson-form,.board-band,.scroll-hint,.filters,.search-label,.js-only,.plaque{display:none!important}
  .wrap,.shell{max-width:none;padding:0}
  .layout,.lesson-editor,.hero,.lab,.stage{display:block;position:static;height:auto;min-height:0;max-height:none;margin:0;padding:0;width:auto}
  .copy{max-width:none;padding:0}
  .paper,.sheet,.tool-section,.lesson-preview,.grid-paper,.article-body .worksheet{background:#fff!important;box-shadow:none!important;border:0;padding:0;transform:none!important}
  h1,h2,h3,h1 em{color:#000}
  h1{font-size:22pt}h2{font-size:15pt;break-after:avoid}h3{break-after:avoid}
  table,tr,figure,.worksheet{break-inside:avoid}
  .scroll,.table-wrap,.table-scroll{overflow:visible}
  table{min-width:0!important;font-size:9.5pt}
  th,td{border-color:#777}
  a{color:#000;text-decoration:none}
  .chk input{border:0;border-bottom:1px solid #777;border-radius:0;background:none}
  .inventory-table input{display:none}
  .print-value{display:inline;white-space:pre-wrap}
  .inventory-summary{background:none;padding:8pt 0}
  .inventory-summary span{display:none}
  img{max-width:60%}
}
.print-value{display:none}