/*
 * Презентации для учителей: плеер и слайды.
 *
 * Слайд — сцена 1600×900 логических пикселей. Скрипт масштабирует её
 * под окно целиком (transform), поэтому все размеры внутри слайда
 * заданы в пикселях сцены и одинаково выглядят на проекторе, ноутбуке
 * и телефоне.
 */

/* ——— Цвета слайдов: тёмная тема (по умолчанию) и светлая ——— */
.dk {
    --s-bg0: #050A17;
    --s-bg1: #0B1733;
    --s-bg2: #12244B;
    --s-ink: #F4F7FD;
    --s-ink2: #C4CFE3;
    --s-mut: #8391AE;
    --s-line: rgba(160, 185, 230, .16);
    --s-card: rgba(255, 255, 255, .045);
    --s-card2: rgba(255, 255, 255, .08);
    --s-a: #FFB23F;      /* главный акцент — фирменный оранжевый */
    --s-a2: #FF7A45;
    --s-c: #4FD1FF;      /* голубой */
    --s-g: #3DDC97;      /* зелёный — «верно» */
    --s-r: #FF6B7A;      /* красный — «неверно» */
    --s-v: #B69CFF;      /* фиолетовый */
    --s-p: #FF8FD0;      /* розовый */
    --s-y: #FFE06B;
    --s-shadow: 0 30px 80px -40px rgba(0, 0, 0, .8);
    --s-glow: .55;
}
.dk.dk--light {
    --s-bg0: #F3F6FB;
    --s-bg1: #FFFFFF;
    --s-bg2: #E8EEF8;
    --s-ink: #0D1A30;
    --s-ink2: #34435E;
    --s-mut: #66758F;
    --s-line: rgba(20, 40, 80, .14);
    --s-card: rgba(15, 35, 75, .035);
    --s-card2: rgba(15, 35, 75, .07);
    --s-a: #D97A00;
    --s-a2: #E2531B;
    --s-c: #0A84C6;
    --s-g: #0E9F63;
    --s-r: #D92D45;
    --s-v: #6D4AE0;
    --s-p: #C4287F;
    --s-y: #B58300;
    --s-shadow: 0 24px 60px -40px rgba(20, 40, 80, .5);
    --s-glow: .18;
}

/* ——— Сброс общих стилей сайта (style.css) внутри плеера и на странице ——— */
.dkp main { background: none; border: 0; border-radius: 0; box-shadow: none; }
.dkp h1, .dkp h2, .dkp h3, .dkp h4 { font-family: inherit; padding: 0; border: 0; margin-top: 0; }
.dkp h1::after, .dkp h2::before { content: none; }
.dkp p { text-align: left; hyphens: manual; -webkit-hyphens: manual; color: inherit; }
.dkp strong { color: inherit; }
.sl h1, .sl h2, .sl h3, .sl h4, .sl p, .sl li, .sl strong, .sl td, .sl th { color: inherit; }
.sl ul, .sl ol { padding-left: 0; margin-bottom: 0; }
.sl li { margin-bottom: 0; }

/* ——— Страница презентации ——— */
.dkp { --pw: 1240px; background: #F4F6FA; color: #0F1B2D; font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; }
.dkp main { max-width: var(--pw); margin: 0 auto; padding: 18px 20px 72px; }
.dkp-crumbs { display: flex; flex-wrap: wrap; gap: 6px 8px; font-size: 13.5px; color: #66758F; margin: 4px 0 14px; }
.dkp-crumbs a { color: #3B4A66; text-decoration: none; font-weight: 600; }
.dkp-crumbs a:hover { color: #D97A00; }
.dkp-crumbs i { font-style: normal; opacity: .5; }
.dkp-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 12px 28px; margin-bottom: 18px; }
.dkp-head h1 { margin: 0; font-size: clamp(26px, 3.2vw, 40px); line-height: 1.12; font-weight: 850; letter-spacing: -.03em; text-wrap: balance; }
.dkp-head h1 small { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: #D97A00; }
.dkp-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.dkp-meta span { display: inline-flex; align-items: center; gap: 6px; padding: 7px 12px; border-radius: 999px; background: #fff; border: 1px solid #E3E8F1; font-size: 13.5px; font-weight: 650; color: #3B4A66; }
.dkp-meta svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ——— Плеер ——— */
.dk { position: relative; border-radius: 22px; overflow: hidden; background: var(--s-bg0); box-shadow: 0 40px 90px -50px rgba(10, 20, 45, .75), 0 0 0 1px rgba(10, 20, 45, .06); outline: none; }
.dk:focus-visible { box-shadow: 0 0 0 3px #F5A623, 0 40px 90px -50px rgba(10, 20, 45, .75); }
.dk__view { position: relative; width: 100%; aspect-ratio: 16 / 9; overflow: hidden; background: var(--s-bg0); cursor: pointer; touch-action: pan-y; user-select: none; -webkit-user-select: none; }
.dk__stage { position: absolute; left: 0; top: 0; width: 1600px; height: 900px; transform-origin: 0 0; }
.dk__bar { display: flex; align-items: center; gap: 6px; padding: 10px 12px; background: #0B1428; color: #DCE4F2; }
.dk--light .dk__bar { background: #fff; color: #1C2A44; border-top: 1px solid #E3E8F1; }
.dk__btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-width: 42px; height: 42px; padding: 0 12px; border: 0; border-radius: 12px; background: rgba(255, 255, 255, .07); color: inherit; font: 650 14px/1 'Inter', system-ui, sans-serif; cursor: pointer; transition: background .15s; }
.dk--light .dk__btn { background: #F0F3F9; }
.dk__btn:hover { background: rgba(255, 255, 255, .14); }
.dk--light .dk__btn:hover { background: #E3E9F4; }
.dk__btn:focus-visible { outline: 2px solid #F5A623; outline-offset: 2px; }
.dk__btn svg { width: 20px; height: 20px; flex: none; stroke: currentColor; fill: none; stroke-width: 2.1; stroke-linecap: round; stroke-linejoin: round; }
.dk__btn--main { background: #F5A623; color: #1A1204; }
.dk__btn--main:hover { background: #FFBC4A; }
.dk--light .dk__btn--main { background: #F5A623; }
.dk--light .dk__btn--main:hover { background: #FFBC4A; }
.dk__num { min-width: 74px; padding: 0 8px; font: 700 14px/1 'Inter', system-ui, sans-serif; font-variant-numeric: tabular-nums; text-align: center; color: inherit; opacity: .85; }
.dk__sp { flex: 1; }
.dk__prog { position: absolute; left: 0; right: 0; bottom: 0; height: 4px; background: rgba(255, 255, 255, .06); z-index: 5; pointer-events: none; }
.dk__prog i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--s-a), var(--s-a2)); transition: width .35s ease; }
.dk__hint { position: absolute; right: 18px; bottom: 16px; z-index: 6; padding: 8px 12px; border-radius: 10px; background: rgba(5, 10, 23, .72); color: #E8EEF8; font: 600 13px/1.2 'Inter', system-ui, sans-serif; pointer-events: none; opacity: 0; transition: opacity .3s; }
.dk__hint.on { opacity: 1; }
.dk__black { position: absolute; inset: 0; z-index: 8; background: #000; display: none; }
.dk.is-black .dk__black { display: block; }
.dk__laser { position: absolute; z-index: 9; width: 18px; height: 18px; margin: -9px 0 0 -9px; border-radius: 50%; background: #FF2D3D; box-shadow: 0 0 0 4px rgba(255, 45, 61, .35), 0 0 24px 6px rgba(255, 45, 61, .6); pointer-events: none; display: none; }
.dk.is-laser .dk__view { cursor: none; }
.dk.is-laser .dk__laser.on { display: block; }

/* Кнопки, которые на узком экране не помещаются, прячем — всё доступно в меню клавиш */
@media (max-width: 640px) {
    .dk { border-radius: 14px; margin: 0 -8px; }
    .dk__btn--opt { display: none; }
    .dk__btn { min-width: 40px; height: 40px; padding: 0 10px; }
    .dk__btn span { display: none; }
    .dk__num { min-width: 60px; }
}

/* ——— Во весь экран (API или запасной вариант для iPhone) ——— */
.dk:fullscreen, .dk.is-full { border-radius: 0; display: flex; flex-direction: column; width: 100vw; height: 100vh; height: 100dvh; background: var(--s-bg0); }
.dk.is-full { position: fixed; inset: 0; z-index: 2147483000; }
.dk:fullscreen .dk__view, .dk.is-full .dk__view { flex: 1; aspect-ratio: auto; height: auto; }
.dk:fullscreen .dk__bar, .dk.is-full .dk__bar { position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); z-index: 7; border-radius: 16px; opacity: 0; transition: opacity .25s; box-shadow: 0 16px 40px -18px rgba(0, 0, 0, .7); }
.dk:fullscreen.show-bar .dk__bar, .dk.is-full.show-bar .dk__bar { opacity: 1; }
.dk:fullscreen .dk__view, .dk.is-full .dk__view { cursor: none; }
.dk:fullscreen.show-bar .dk__view, .dk.is-full.show-bar .dk__view { cursor: pointer; }
html.dk-lock, html.dk-lock body { overflow: hidden; }

/* ——— Обзор всех слайдов ——— */
.dk__ov { position: absolute; inset: 0; z-index: 10; display: none; overflow-y: auto; padding: 22px; background: rgba(4, 8, 18, .94); backdrop-filter: blur(6px); }
.dk.is-ov .dk__ov { display: block; }
.dk__ovh { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; color: #E8EEF8; font: 800 16px/1.2 'Inter', system-ui, sans-serif; }
.dk__ovg { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.dk__th { position: relative; display: block; padding: 0; border: 2px solid transparent; border-radius: 12px; overflow: hidden; background: var(--s-bg0); cursor: pointer; aspect-ratio: 16 / 9; text-align: left; }
.dk__th:hover, .dk__th:focus-visible { border-color: #F5A623; outline: none; }
.dk__th.cur { border-color: #4FD1FF; }
.dk__th .dk__thin { position: absolute; left: 0; top: 0; width: 1600px; height: 900px; transform-origin: 0 0; pointer-events: none; }
.dk__th b { position: absolute; left: 8px; top: 8px; z-index: 2; min-width: 28px; padding: 4px 7px; border-radius: 8px; background: rgba(5, 10, 23, .8); color: #fff; font: 800 13px/1 'Inter', system-ui, sans-serif; text-align: center; }

/* ——— Под плеером: заметки, содержание, помощь ——— */
.dkp-notes { margin-top: 16px; display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: start; padding: 16px 18px; border-radius: 16px; background: #FFF8EB; border: 1px solid #FBE0B0; }
.dkp-notes[hidden] { display: none; }
.dkp-notes svg { width: 22px; height: 22px; stroke: #C26A00; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; margin-top: 1px; }
.dkp-notes b { display: block; font-size: 12px; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; color: #B36200; margin-bottom: 5px; }
.dkp-notes p { margin: 0; font-size: 15.5px; line-height: 1.55; color: #3A2A10; }

.dkp-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 22px; margin-top: 30px; }
@media (max-width: 900px) { .dkp-grid { grid-template-columns: 1fr; } }
.dkp-box { padding: 24px 24px 22px; border-radius: 20px; background: #fff; border: 1px solid #E3E8F1; }
.dkp-box h2 { margin: 0 0 14px; font-size: 20px; font-weight: 850; letter-spacing: -.02em; }
.dkp-box p { margin: 0 0 12px; font-size: 15.5px; line-height: 1.6; color: #3B4A66; }
.dkp-toc { margin: 0; padding: 0; list-style: none; counter-reset: t; columns: 2; column-gap: 22px; }
@media (max-width: 560px) { .dkp-toc { columns: 1; } }
.dkp-toc li { break-inside: avoid; counter-increment: t; }
.dkp-toc a { display: grid; grid-template-columns: 30px 1fr; gap: 6px; padding: 7px 8px; margin: 0 -8px; border-radius: 10px; color: #1C2A44; text-decoration: none; font-size: 14.5px; line-height: 1.35; font-weight: 550; }
.dkp-toc a::before { content: counter(t); font-weight: 800; color: #9AA6BD; font-variant-numeric: tabular-nums; }
.dkp-toc a:hover { background: #F4F6FA; color: #D97A00; }
.dkp-toc a.cur { background: #FFF4E0; }
.dkp-toc a.cur::before { color: #D97A00; }
.dkp-keys { display: grid; grid-template-columns: auto 1fr; gap: 8px 14px; margin: 0; font-size: 14.5px; color: #3B4A66; align-items: center; }
.dkp-keys dt { display: flex; gap: 4px; flex-wrap: wrap; }
.dkp-keys dd { margin: 0; }
.dkp-keys kbd { display: inline-block; min-width: 26px; padding: 4px 7px; border-radius: 7px; background: #F0F3F9; border: 1px solid #DCE3EF; border-bottom-width: 2px; font: 700 12.5px/1 'Inter', system-ui, sans-serif; text-align: center; color: #1C2A44; }
.dkp-links { display: grid; gap: 10px; margin-top: 18px; }
.dkp-links a { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 14px; background: #F4F6FA; color: #0F1B2D; text-decoration: none; font-weight: 700; font-size: 15px; transition: background .15s; }
.dkp-links a:hover { background: #FFF1D6; }
.dkp-links a small { display: block; margin-top: 2px; font-weight: 550; font-size: 13px; color: #66758F; }
.dkp-links svg { width: 22px; height: 22px; flex: none; stroke: #D97A00; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.dkp-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.dkp-pn a { display: block; padding: 16px 18px; border-radius: 16px; background: #fff; border: 1px solid #E3E8F1; color: #0F1B2D; text-decoration: none; transition: border-color .15s, transform .15s; }
.dkp-pn a:hover { border-color: #F5A623; transform: translateY(-1px); }
.dkp-pn a small { display: block; font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: #8391AE; margin-bottom: 5px; }
.dkp-pn a b { font-size: 15.5px; line-height: 1.35; }
.dkp-pn a.nx { text-align: right; grid-column: 2; }

/* ================================================================
   СЛАЙДЫ
   ================================================================ */
.sl {
    position: absolute; inset: 0; overflow: hidden;
    display: flex; flex-direction: column;
    padding: 64px 96px 70px;
    color: var(--s-ink);
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    font-size: 34px; line-height: 1.38; letter-spacing: -.01em;
    background:
        radial-gradient(1100px 700px at 88% -10%, color-mix(in srgb, var(--s-bg2) 100%, transparent), transparent 70%),
        radial-gradient(900px 600px at -5% 110%, color-mix(in srgb, var(--s-bg2) 70%, transparent), transparent 70%),
        linear-gradient(180deg, var(--s-bg1), var(--s-bg0));
    visibility: hidden; opacity: 0;
    transition: opacity .45s ease, visibility 0s linear .45s;
}
.sl.cur { visibility: visible; opacity: 1; transition: opacity .45s ease, visibility 0s; z-index: 2; }
.sl::before { /* лёгкая шестиугольная сетка — «химический» фон */
    content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: calc(var(--s-glow) * .22);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='84' height='97' viewBox='0 0 84 97'%3E%3Cpath d='M42 1l40 23v46L42 96 2 70V24z' fill='none' stroke='%237fa2e8' stroke-width='1.4'/%3E%3C/svg%3E");
    background-size: 84px 97px;
    -webkit-mask-image: radial-gradient(900px 600px at 100% 0%, #000, transparent 75%);
    mask-image: radial-gradient(900px 600px at 100% 0%, #000, transparent 75%);
}
.sl > * { position: relative; }
.sl > .sl__body { position: static; }
.sl.cur { isolation: isolate; }
.sl__kick { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; font-size: 21px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--s-a); }
.sl__kick::before { content: ""; width: 34px; height: 4px; border-radius: 4px; background: linear-gradient(90deg, var(--s-a), var(--s-a2)); }
.sl h2 { margin: 0 0 34px; font-size: 62px; line-height: 1.06; font-weight: 850; letter-spacing: -.035em; text-wrap: balance; }
.sl h2 em, .sl .hl { font-style: normal; color: var(--s-a); }
.sl h3 { margin: 0 0 14px; font-size: 36px; line-height: 1.15; font-weight: 800; letter-spacing: -.02em; }
.sl p { margin: 0 0 18px; }
.sl__body { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.sl__body--c { justify-content: center; }
.sl__foot { position: absolute; left: 96px; right: 96px; bottom: 26px; display: flex; justify-content: space-between; align-items: center; font-size: 17px; font-weight: 650; color: var(--s-mut); letter-spacing: .02em; }
.sl__foot b { color: var(--s-ink2); font-weight: 800; }
.sl__foot b i { font-style: normal; color: var(--s-a); }
.sl-notes { display: none; }

/* Текстовые приёмы */
.sl .mut { color: var(--s-mut); }
.sl .ink2 { color: var(--s-ink2); }
.sl .sm { font-size: 27px; line-height: 1.42; }
.sl .xs { font-size: 22px; line-height: 1.4; }
.sl .lg { font-size: 42px; line-height: 1.25; font-weight: 700; }
.sl .c-a { color: var(--s-a); } .sl .c-c { color: var(--s-c); } .sl .c-g { color: var(--s-g); }
.sl .c-r { color: var(--s-r); } .sl .c-v { color: var(--s-v); } .sl .c-p { color: var(--s-p); } .sl .c-y { color: var(--s-y); }
.sl b, .sl strong { font-weight: 800; }
.sl .u { text-decoration: underline; text-decoration-thickness: 4px; text-underline-offset: 8px; text-decoration-color: var(--s-a); }
.sl .center { text-align: center; }
.sl .mt { margin-top: 26px; } .sl .mt2 { margin-top: 44px; } .sl .mb0 { margin-bottom: 0; }
.sl .auto { margin-top: auto; }

/* Раскладки */
.sl .cols { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: start; }
.sl .cols--mid { align-items: center; }
.sl .cols--st { align-items: stretch; }
.sl .cols3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; align-items: stretch; }
.sl .cols4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; align-items: stretch; }
.sl .cols-6-4 { display: grid; grid-template-columns: 1.5fr 1fr; gap: 44px; align-items: center; }
.sl .cols-4-6 { display: grid; grid-template-columns: 1fr 1.5fr; gap: 44px; align-items: center; }
.sl .row { display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
.sl .row--c { justify-content: center; }
.sl .fill { flex: 1; min-height: 0; }

/* Карточки */
.sl .cd { padding: 32px 36px; border-radius: 30px; background: var(--s-card); border: 1.5px solid var(--s-line); box-shadow: var(--s-shadow); }
.sl .cd > :last-child { margin-bottom: 0; }
.sl .cd h3 { font-size: 32px; }
.sl .cd--a { border-color: color-mix(in srgb, var(--s-a) 55%, transparent); background: color-mix(in srgb, var(--s-a) 8%, transparent); }
.sl .cd--c { border-color: color-mix(in srgb, var(--s-c) 55%, transparent); background: color-mix(in srgb, var(--s-c) 8%, transparent); }
.sl .cd--g { border-color: color-mix(in srgb, var(--s-g) 55%, transparent); background: color-mix(in srgb, var(--s-g) 8%, transparent); }
.sl .cd--r { border-color: color-mix(in srgb, var(--s-r) 55%, transparent); background: color-mix(in srgb, var(--s-r) 8%, transparent); }
.sl .cd--v { border-color: color-mix(in srgb, var(--s-v) 55%, transparent); background: color-mix(in srgb, var(--s-v) 8%, transparent); }
.sl .cd--a h3 { color: var(--s-a); } .sl .cd--c h3 { color: var(--s-c); } .sl .cd--g h3 { color: var(--s-g); }
.sl .cd--r h3 { color: var(--s-r); } .sl .cd--v h3 { color: var(--s-v); }
.sl .cd--tight { padding: 22px 26px; border-radius: 24px; }

/* Определение */
.sl .def { position: relative; padding: 30px 38px 32px 44px; border-radius: 28px; background: linear-gradient(135deg, color-mix(in srgb, var(--s-a) 16%, transparent), color-mix(in srgb, var(--s-a) 4%, transparent)); border: 1.5px solid color-mix(in srgb, var(--s-a) 45%, transparent); font-size: 38px; line-height: 1.34; }
.sl .def::before { content: ""; position: absolute; left: 0; top: 26px; bottom: 26px; width: 7px; border-radius: 0 7px 7px 0; background: linear-gradient(180deg, var(--s-a), var(--s-a2)); }
.sl .def small { display: block; margin-bottom: 8px; font-size: 20px; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; color: var(--s-a); }
.sl .def b { color: var(--s-a); }
.sl .def--c { background: linear-gradient(135deg, color-mix(in srgb, var(--s-c) 15%, transparent), color-mix(in srgb, var(--s-c) 4%, transparent)); border-color: color-mix(in srgb, var(--s-c) 45%, transparent); }
.sl .def--c::before { background: var(--s-c); } .sl .def--c small, .sl .def--c b { color: var(--s-c); }
.sl .def--g { background: linear-gradient(135deg, color-mix(in srgb, var(--s-g) 15%, transparent), color-mix(in srgb, var(--s-g) 4%, transparent)); border-color: color-mix(in srgb, var(--s-g) 45%, transparent); }
.sl .def--g::before { background: var(--s-g); } .sl .def--g small, .sl .def--g b { color: var(--s-g); }
.sl .def--v { background: linear-gradient(135deg, color-mix(in srgb, var(--s-v) 15%, transparent), color-mix(in srgb, var(--s-v) 4%, transparent)); border-color: color-mix(in srgb, var(--s-v) 45%, transparent); }
.sl .def--v::before { background: var(--s-v); } .sl .def--v small, .sl .def--v b { color: var(--s-v); }

/* Списки */
.sl ul.ls { margin: 0; padding: 0; list-style: none; display: grid; gap: 16px; }
.sl ul.ls > li { position: relative; padding-left: 44px; }
.sl ul.ls > li::before { content: ""; position: absolute; left: 6px; top: .5em; width: 16px; height: 16px; border-radius: 5px; transform: rotate(45deg); background: linear-gradient(135deg, var(--s-a), var(--s-a2)); }
.sl ul.ls--c > li::before { background: var(--s-c); }
.sl ul.ls--g > li::before { background: var(--s-g); }
.sl ul.ls--r > li::before { background: var(--s-r); }
.sl ul.ls--v > li::before { background: var(--s-v); }
.sl ul.ls--sm { gap: 11px; font-size: 29px; line-height: 1.36; }
.sl ul.ls--sm > li { padding-left: 38px; }
.sl ul.ls--sm > li::before { width: 13px; height: 13px; left: 5px; }
.sl ol.nm { margin: 0; padding: 0; list-style: none; counter-reset: n; display: grid; gap: 18px; }
.sl ol.nm > li { counter-increment: n; position: relative; padding-left: 68px; min-height: 50px; }
.sl ol.nm > li::before { content: counter(n); position: absolute; left: 0; top: -2px; width: 50px; height: 50px; border-radius: 16px; display: grid; place-items: center; font-size: 26px; font-weight: 850; color: #1A1204; background: linear-gradient(135deg, var(--s-a), var(--s-a2)); }

/* Метки */
.sl .tag { display: inline-flex; align-items: center; gap: 10px; padding: 8px 18px; border-radius: 999px; font-size: 22px; font-weight: 800; letter-spacing: .02em; background: var(--s-card2); border: 1.5px solid var(--s-line); color: var(--s-ink2); white-space: nowrap; vertical-align: middle; }
.sl .tag--a { color: var(--s-a); border-color: color-mix(in srgb, var(--s-a) 50%, transparent); background: color-mix(in srgb, var(--s-a) 12%, transparent); }
.sl .tag--c { color: var(--s-c); border-color: color-mix(in srgb, var(--s-c) 50%, transparent); background: color-mix(in srgb, var(--s-c) 12%, transparent); }
.sl .tag--g { color: var(--s-g); border-color: color-mix(in srgb, var(--s-g) 50%, transparent); background: color-mix(in srgb, var(--s-g) 12%, transparent); }
.sl .tag--r { color: var(--s-r); border-color: color-mix(in srgb, var(--s-r) 50%, transparent); background: color-mix(in srgb, var(--s-r) 12%, transparent); }
.sl .tag--v { color: var(--s-v); border-color: color-mix(in srgb, var(--s-v) 50%, transparent); background: color-mix(in srgb, var(--s-v) 12%, transparent); }
.sl .kw { color: var(--s-a); font-weight: 800; }

/* Таблица */
.sl table.tb { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 28px; line-height: 1.3; border-radius: 24px; overflow: hidden; border: 1.5px solid var(--s-line); }
.sl table.tb th { padding: 18px 24px; text-align: left; font-size: 21px; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; color: var(--s-a); background: var(--s-card2); }
.sl table.tb td { padding: 16px 24px; border-top: 1.5px solid var(--s-line); vertical-align: middle; }
.sl table.tb tr:nth-child(even) td { background: var(--s-card); }
.sl table.tb td.big, .sl table.tb th.big { font-size: 34px; font-weight: 800; }
.sl table.tb .ctr { text-align: center; }

/* Химические формулы и уравнения (разметка из tools/organic/chem.mjs) */
.sl .f { font-weight: 700; white-space: nowrap; letter-spacing: 0; }
.sl .f sub, .sl .rx sub { font-size: .66em; line-height: 0; vertical-align: -.3em; }
.sl .f sup, .sl .rx sup { font-size: .62em; line-height: 0; vertical-align: .62em; }
.sl .f .b, .sl .rx .b { padding: 0 .05em; }
.sl .ox { position: relative; display: inline-block; margin-top: .62em; line-height: 1.1; }
.sl .ox > i { position: absolute; left: 50%; bottom: 100%; transform: translateX(-50%); margin-bottom: -.12em; font-style: normal; font-size: .56em; font-weight: 850; line-height: 1; color: var(--s-c); letter-spacing: 0; white-space: nowrap; }
.sl .ox > i.m { color: var(--s-r); }
.sl .ox > i.p { color: var(--s-g); }
.sl .ox > i.z { color: var(--s-mut); }
.sl .ox > i.a { color: var(--s-a); }
.sl .rx { display: flex; flex-direction: column; align-items: center; gap: 14px; justify-content: center; margin: 12px 0; padding: 22px 28px; border-radius: 24px; background: var(--s-card); border: 1.5px solid var(--s-line); }
.sl .rx__eq { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 10px 2px; font-size: 40px; font-weight: 700; line-height: 1.2; }
.sl .rx__sp { display: inline-flex; flex-direction: column; align-items: center; white-space: nowrap; }
.sl .rx__row { display: inline-flex; align-items: baseline; white-space: nowrap; }
.sl .rx__lab { margin-top: 6px; font-size: 20px; font-weight: 650; color: var(--s-mut); }
.sl .rx__k { margin-right: .08em; color: var(--s-a); font-weight: 850; }
.sl .rx__plus { margin: 0 .45em; color: var(--s-mut); font-weight: 400; align-self: center; }
.sl .rx__txt { font-size: 26px; color: var(--s-mut); font-weight: 650; }
.sl .rx__arr { display: inline-grid; grid-template-rows: auto 14px auto; align-items: center; justify-items: center; min-width: 110px; margin: 0 .5em; align-self: center; }
.sl .rx__c { min-height: 1em; padding: 0 6px; font-size: 22px; font-weight: 700; line-height: 1.2; color: var(--s-ink2); white-space: nowrap; }
.sl .rx__c--b { color: var(--s-mut); }
.sl .rx__line { position: relative; width: 100%; height: 3px; background: var(--s-ink); border-radius: 3px; }
.sl .rx__line::after { content: ""; position: absolute; right: -1px; top: 50%; width: 14px; height: 14px; border-top: 3px solid var(--s-ink); border-right: 3px solid var(--s-ink); transform: translateY(-50%) rotate(45deg); }
.sl .rx__line--eq { height: 14px; background: none; }
.sl .rx__line--eq::after { content: none; }
.sl .rx__line--eq i { position: absolute; left: 0; right: 0; height: 3px; background: var(--s-ink); border-radius: 3px; }
.sl .rx__line--eq i:first-child { top: 0; } .sl .rx__line--eq i:last-child { bottom: 0; }
.sl .rx__line--eq i:first-child::after, .sl .rx__line--eq i:last-child::before { content: ""; position: absolute; width: 14px; height: 3px; background: var(--s-ink); border-radius: 3px; }
.sl .rx__line--eq i:first-child::after { right: 0; top: 0; width: 16px; transform: rotate(35deg); transform-origin: right center; }
.sl .rx__line--eq i:last-child::before { left: 0; top: 0; width: 16px; transform: rotate(35deg); transform-origin: left center; }

/* Рисунки */
.sl svg.fig { display: block; max-width: 100%; height: auto; overflow: visible; }
.sl .fig-c { display: flex; justify-content: center; align-items: center; }
.sl .cap { margin-top: 12px; font-size: 22px; font-weight: 700; color: var(--s-mut); text-align: center; letter-spacing: .02em; }
.sl .cap b { color: var(--s-ink); }
/* Модель атома: электроны медленно вращаются по оболочкам */
.sl .atom .orb { fill: none; stroke: var(--s-line); stroke-width: 2.5; }
.sl .atom .orb--hl { stroke: color-mix(in srgb, var(--s-a) 60%, transparent); stroke-width: 3.5; }
.sl .atom .spin { transform-box: view-box; transform-origin: 50% 50%; }
.sl.cur .atom .spin { animation: dk-spin var(--t, 30s) linear infinite; }
.sl .atom .nuc-t { font-size: 34px; font-weight: 850; fill: #fff; text-anchor: middle; dominant-baseline: central; }
.sl .atom .lbl { font-size: 22px; font-weight: 800; fill: var(--s-mut); text-anchor: middle; }
.sl .atom .lbl--a { fill: var(--s-a); }
@keyframes dk-spin { to { transform: rotate(360deg); } }
/* Схема строения: +Z )2 )8 )3 */
.sl .scheme .arc { fill: none; stroke: var(--s-ink); stroke-width: 4; stroke-linecap: round; }
.sl .scheme .z { font-size: 50px; font-weight: 850; fill: var(--s-ink); text-anchor: middle; dominant-baseline: central; }
.sl .scheme .zb { fill: color-mix(in srgb, var(--s-a) 16%, transparent); stroke: var(--s-a); stroke-width: 3; }
.sl .scheme .ne { font-size: 40px; font-weight: 850; fill: var(--s-c); text-anchor: middle; }
.sl .scheme .ne--out { fill: var(--s-a); }
/* Шаростержневые модели */
.sl .mol .bond { stroke: color-mix(in srgb, var(--s-ink2) 70%, transparent); stroke-linecap: round; }
.sl .mol .at-t { font-size: 30px; font-weight: 850; text-anchor: middle; dominant-baseline: central; fill: #fff; paint-order: stroke; stroke: rgba(0, 0, 0, .35); stroke-width: 3px; }
.sl .mol .at-t--d { fill: #152033; stroke: rgba(255, 255, 255, .5); }

/* Периодическая таблица (фрагмент главных подгрупп) */
.sl .pt { display: grid; grid-template-columns: 70px repeat(8, 1fr); gap: 8px; }
.sl .pt__h { display: grid; place-items: center; font-size: 22px; font-weight: 850; color: var(--s-mut); }
.sl .pt__p { display: grid; place-items: center; font-size: 22px; font-weight: 850; color: var(--s-mut); }
.sl .pt__e { position: relative; padding: 8px 10px 9px; border-radius: 14px; background: var(--s-card); border: 1.5px solid var(--s-line); line-height: 1; min-height: 88px; display: flex; flex-direction: column; justify-content: space-between; transition: background .35s, border-color .35s, box-shadow .35s, opacity .35s; }
.sl .pt__e i { font-style: normal; font-size: 17px; font-weight: 750; color: var(--s-mut); }
.sl .pt__e b { font-size: 36px; font-weight: 850; letter-spacing: -.02em; }
.sl .pt__e small { font-size: 17px; font-weight: 800; color: var(--s-c); letter-spacing: .01em; }
.sl .pt__e.met b { color: var(--s-ink); }
.sl .pt__e.nm b { color: var(--s-ink); }
.sl .pt__e.hl { background: color-mix(in srgb, var(--s-a) 20%, transparent); border-color: var(--s-a); box-shadow: 0 0 0 3px color-mix(in srgb, var(--s-a) 25%, transparent), 0 0 40px -6px color-mix(in srgb, var(--s-a) 70%, transparent); }
.sl .pt__e.hl2 { background: color-mix(in srgb, var(--s-c) 20%, transparent); border-color: var(--s-c); box-shadow: 0 0 0 3px color-mix(in srgb, var(--s-c) 25%, transparent); }
.sl .pt__e.hl3 { background: color-mix(in srgb, var(--s-g) 20%, transparent); border-color: var(--s-g); }
.sl .pt--dim .pt__e:not(.hl):not(.hl2):not(.hl3) { opacity: .38; }
.sl .pt--sm .pt__e { min-height: 70px; padding: 6px 8px; }
.sl .pt--sm .pt__e b { font-size: 30px; }
.sl .pt--sm .pt__e i, .sl .pt--sm .pt__e small { font-size: 15px; }
.sl .pt-wrap { position: relative; }
.sl .pt-wrap--h { padding-top: 58px; }
.sl .pt-wrap--v { padding-left: 58px; }
.sl .pt-arr { position: absolute; display: flex; align-items: center; gap: 14px; font-size: 23px; font-weight: 850; white-space: nowrap; }
.sl .pt-arr i { position: relative; flex: 1; background: currentColor; border-radius: 5px; }
.sl .pt-arr--h { left: 78px; right: 10px; top: 0; height: 44px; color: var(--s-c); }
.sl .pt-wrap--v .pt-arr--h { left: 136px; }
.sl .pt-arr--h i { height: 5px; }
.sl .pt-arr--h i::after { content: ""; position: absolute; right: 0; top: 50%; width: 18px; height: 18px; border-top: 5px solid; border-right: 5px solid; transform: translateY(-50%) rotate(45deg); border-radius: 2px; }
.sl .pt-arr--v { left: 0; top: 100px; bottom: 10px; width: 44px; flex-direction: column; color: var(--s-v); }
.sl .pt-wrap--h .pt-arr--v { top: 158px; }
.sl .pt-arr--v span { writing-mode: vertical-rl; }
.sl .pt-arr--v i { width: 5px; }
.sl .pt-arr--v i::after { content: ""; position: absolute; bottom: 0; left: 50%; width: 18px; height: 18px; border-bottom: 5px solid; border-right: 5px solid; transform: translateX(-50%) rotate(45deg); border-radius: 2px; }

/* Стрелка-тренд: подпись и направление */
.sl .trend { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; font-size: 28px; font-weight: 750; }
.sl .trend__ln { position: relative; height: 6px; border-radius: 6px; background: linear-gradient(90deg, color-mix(in srgb, var(--tc, var(--s-a)) 25%, transparent), var(--tc, var(--s-a))); }
.sl .trend__ln::after { content: ""; position: absolute; right: -4px; top: 50%; width: 22px; height: 22px; border-top: 6px solid var(--tc, var(--s-a)); border-right: 6px solid var(--tc, var(--s-a)); border-radius: 3px; transform: translateY(-50%) rotate(45deg); }
.sl .trend--c { --tc: var(--s-c); } .sl .trend--g { --tc: var(--s-g); } .sl .trend--v { --tc: var(--s-v); } .sl .trend--r { --tc: var(--s-r); }

/* Задание из КИМ и разбор */
.sl .task { padding: 30px 36px; border-radius: 28px; background: var(--s-card); border: 1.5px solid var(--s-line); font-size: 31px; line-height: 1.4; }
.sl .task__q { margin: 0 0 18px; font-weight: 650; }
.sl .task__q b { color: var(--s-a); }
.sl ol.opts { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; counter-reset: o; }
.sl ol.opts > li { counter-increment: o; position: relative; display: flex; align-items: center; gap: 16px; padding: 8px 16px 8px 70px; min-height: 56px; border-radius: 18px; border: 1.5px solid transparent; transition: background .35s, border-color .35s, opacity .35s; }
.sl ol.opts > li::before { content: counter(o); position: absolute; left: 12px; top: 50%; transform: translateY(-50%); width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center; font-size: 23px; font-weight: 850; background: var(--s-card2); color: var(--s-ink2); transition: background .35s, color .35s; }
.sl ol.opts > li > .t { flex: 1; }
.sl ol.opts--az > li:nth-child(1)::before { content: "А"; }
.sl ol.opts--az > li:nth-child(2)::before { content: "Б"; }
.sl ol.opts--az > li:nth-child(3)::before { content: "В"; }
.sl ol.opts--az > li:nth-child(4)::before { content: "Г"; }
.sl .vd { flex: none; display: inline-flex; align-items: center; gap: 8px; padding: 7px 14px; border-radius: 12px; font-size: 21px; font-weight: 800; white-space: nowrap; max-width: 520px; background: var(--s-card2); color: var(--s-ink2); }
.sl .vd.ok { background: color-mix(in srgb, var(--s-g) 18%, transparent); color: var(--s-g); }
.sl .vd.no { background: color-mix(in srgb, var(--s-r) 14%, transparent); color: var(--s-r); }
.sl .vd svg { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.sl ol.opts > li:has(> .vd.ok.on) { background: color-mix(in srgb, var(--s-g) 10%, transparent); border-color: color-mix(in srgb, var(--s-g) 45%, transparent); }
.sl ol.opts > li:has(> .vd.ok.on)::before { background: var(--s-g); color: #062014; }
.sl ol.opts > li:has(> .vd.no.on) > .t { opacity: .55; }
.sl .ans { display: inline-flex; align-items: center; gap: 18px; padding: 16px 28px; border-radius: 22px; background: linear-gradient(135deg, color-mix(in srgb, var(--s-g) 22%, transparent), color-mix(in srgb, var(--s-g) 8%, transparent)); border: 2px solid var(--s-g); font-size: 34px; font-weight: 800; }
.sl .ans small { font-size: 20px; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; color: var(--s-g); }
.sl .ans b { font-size: 44px; letter-spacing: .12em; color: var(--s-ink); }
.sl .why { font-size: 27px; line-height: 1.42; color: var(--s-ink2); }
.sl .why b { color: var(--s-ink); }

/* Сопоставление: формулы ↔ ответы */
.sl .match { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.sl .match h4 { margin: 0 0 12px; font-size: 20px; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; color: var(--s-mut); }

/* Итоговые «шпаргалки» и шаги алгоритма */
.sl .steps { display: grid; gap: 18px; counter-reset: st; }
.sl .steps > div { counter-increment: st; display: grid; grid-template-columns: 64px 1fr; gap: 22px; align-items: start; padding: 22px 26px; border-radius: 24px; background: var(--s-card); border: 1.5px solid var(--s-line); }
.sl .steps > div::before { content: counter(st); width: 64px; height: 64px; border-radius: 20px; display: grid; place-items: center; font-size: 32px; font-weight: 850; color: #1A1204; background: linear-gradient(135deg, var(--s-a), var(--s-a2)); }
.sl .steps--sm > div { padding: 16px 22px; grid-template-columns: 52px 1fr; font-size: 29px; }
.sl .steps--sm > div::before { width: 52px; height: 52px; border-radius: 16px; font-size: 26px; }

/* Большие цифры и «плашки» */
.sl .num-xl { font-size: 150px; line-height: .9; font-weight: 900; letter-spacing: -.05em; background: linear-gradient(135deg, var(--s-a), var(--s-a2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sl .kv { display: grid; grid-template-columns: auto 1fr; gap: 12px 26px; align-items: baseline; }
.sl .kv dt { font-weight: 850; color: var(--s-a); }
.sl .kv dd { margin: 0; }
.sl .vs { display: grid; place-items: center; width: 84px; height: 84px; border-radius: 50%; background: var(--s-card2); font-size: 30px; font-weight: 900; color: var(--s-mut); }
.sl .big-arrow { font-size: 64px; font-weight: 300; color: var(--s-a); line-height: 1; }
.sl .warn { display: flex; gap: 22px; align-items: flex-start; padding: 26px 30px; border-radius: 26px; background: color-mix(in srgb, var(--s-r) 10%, transparent); border: 1.5px solid color-mix(in srgb, var(--s-r) 45%, transparent); }
.sl .warn::before { content: "!"; flex: none; width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center; font-size: 34px; font-weight: 900; color: #fff; background: var(--s-r); }
.sl .warn > div > :last-child { margin-bottom: 0; }
.sl .tip { display: flex; gap: 22px; align-items: flex-start; padding: 24px 30px; border-radius: 26px; background: color-mix(in srgb, var(--s-c) 10%, transparent); border: 1.5px solid color-mix(in srgb, var(--s-c) 40%, transparent); }
.sl .tip::before { content: ""; flex: none; width: 56px; height: 56px; border-radius: 50%; background: var(--s-c) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23051224' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 18h6M10 21h4M12 3a6 6 0 0 0-4 10.5c.7.7 1 1.5 1 2.5h6c0-1 .3-1.8 1-2.5A6 6 0 0 0 12 3z'/%3E%3C/svg%3E") center / 30px no-repeat; }
.sl .tip > div > :last-child { margin-bottom: 0; }

/* ——— Титульный слайд ——— */
.sl--title { padding: 80px 110px; justify-content: center; }
.sl--title::after { content: ""; position: absolute; right: -180px; top: -160px; width: 820px; height: 820px; border-radius: 50%; background: radial-gradient(circle, color-mix(in srgb, var(--s-a) 34%, transparent), transparent 62%); opacity: var(--s-glow); pointer-events: none; z-index: -1; }
.sl--title .ti-badge { display: inline-flex; align-items: center; gap: 16px; align-self: flex-start; padding: 12px 24px 12px 14px; border-radius: 999px; background: var(--s-card2); border: 1.5px solid var(--s-line); font-size: 24px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--s-ink2); }
.sl--title .ti-badge i { font-style: normal; display: grid; place-items: center; min-width: 50px; height: 50px; padding: 0 10px; border-radius: 999px; background: linear-gradient(135deg, var(--s-a), var(--s-a2)); color: #1A1204; font-size: 26px; font-weight: 900; letter-spacing: 0; }
.sl--title h1 { margin: 36px 0 26px; max-width: 960px; font-size: 92px; line-height: .98; font-weight: 900; letter-spacing: -.045em; text-wrap: balance; }
.sl--title h1 em { font-style: normal; background: linear-gradient(92deg, #FFD27A 0%, var(--s-a) 45%, var(--s-a2) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.dk--light .sl--title h1 em { background: linear-gradient(92deg, #E08A00, #E2531B); -webkit-background-clip: text; background-clip: text; }
.sl--title .ti-sub { max-width: 860px; font-size: 34px; line-height: 1.4; color: var(--s-ink2); }
.sl--title .ti-foot { display: flex; gap: 14px; margin-top: 54px; flex-wrap: wrap; }
.sl--title .ti-art { position: absolute; right: 90px; top: 50%; transform: translateY(-50%); width: 560px; }

/* ——— Раздел ——— */
.sl--sec { justify-content: center; padding-left: 130px; }
.sl--sec .sec-n { font-size: 190px; line-height: .85; font-weight: 900; letter-spacing: -.06em; color: transparent; -webkit-text-stroke: 3px color-mix(in srgb, var(--s-a) 70%, transparent); }
.sl--sec h2 { margin: 26px 0 18px; font-size: 84px; max-width: 1150px; }
.sl--sec p { max-width: 1050px; font-size: 34px; color: var(--s-ink2); }
.sl--sec .sec-art { position: absolute; right: 110px; top: 50%; transform: translateY(-50%); }

/* ——— Появление по шагам ——— */
.sl .s { opacity: 0; transform: translateY(18px); transition: opacity .5s ease, transform .5s cubic-bezier(.2, .7, .2, 1); }
.sl .s.on { opacity: 1; transform: none; }
.sl .s.s-pop { transform: scale(.85); }
.sl .s.s-pop.on { transform: none; }
.sl .s.s-left { transform: translateX(-40px); }
.sl .s.s-left.on { transform: none; }
.sl .s.s-fade { transform: none; }
.sl g.s, .sl circle.s, .sl path.s, .sl text.s, .sl line.s { transform: none; transition: opacity .5s ease; }
/* Выделение по шагу: элемент уже виден, шаг его подсвечивает */
.sl .s-hl { transition: background .4s, box-shadow .4s, color .4s, border-color .4s; }
.sl .s-hl.on { background: color-mix(in srgb, var(--s-a) 18%, transparent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--s-a) 55%, transparent); border-radius: 12px; }
.sl .s-hl.s { opacity: 1; transform: none; }
.sl .pt__e.s-mark.on { background: color-mix(in srgb, var(--s-a) 20%, transparent); border-color: var(--s-a); box-shadow: 0 0 0 3px color-mix(in srgb, var(--s-a) 25%, transparent), 0 0 40px -6px color-mix(in srgb, var(--s-a) 70%, transparent); }
.sl .pt__e.s-mark { opacity: 1; transform: none; }
/* Зачёркивание по шагу */
.sl .s-x { position: relative; }
.sl .s-x.s { opacity: 1; transform: none; }
.sl .s-x::after { content: ""; position: absolute; left: -4px; right: -4px; top: 52%; height: 4px; border-radius: 4px; background: var(--s-r); transform: scaleX(0); transform-origin: left; transition: transform .45s ease; }
.sl .s-x.on::after { transform: scaleX(1); }

@media (prefers-reduced-motion: reduce) {
    .sl, .sl .s, .sl .s-x::after { transition: none !important; }
    .sl.cur .atom .spin { animation: none; }
}

/* Обзор: миниатюры показывают все шаги */
.dk__thin .sl { visibility: visible; opacity: 1; transition: none; isolation: isolate; }
.dk__thin .sl .s { opacity: 1; transform: none; transition: none; }
.dk__thin .sl .atom .spin { animation: none !important; }

/* ——— Печать: каждый слайд — отдельная страница, все шаги видны ——— */
@media print {
    @page { size: 1600px 900px; margin: 0; }
    html, body { background: #fff !important; }
    body.dkp > *:not(main), .dkp main > *:not(.dk), .dk__bar, .dk__prog, .dk__ov, .dk__hint, .dk__black, .dk__laser { display: none !important; }
    .dkp main { max-width: none; padding: 0; margin: 0; }
    .dk { border-radius: 0; box-shadow: none; overflow: visible; background: none; }
    .dk__view { aspect-ratio: auto; overflow: visible; height: auto; }
    .dk__stage { position: static; transform: none !important; width: auto; height: auto; }
    .sl { position: relative; width: 1600px; height: 900px; visibility: visible !important; opacity: 1 !important; break-after: page; page-break-after: always; transition: none; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
    .sl .s { opacity: 1 !important; transform: none !important; transition: none !important; }
    .sl .s-x::after { transform: scaleX(1); transition: none; }
    .sl .atom .spin { animation: none !important; }
    /* Текст с градиентной заливкой печатается сплошным цветом: PDF-движки рисуют его прямоугольником */
    .sl--title h1 em, .sl .num-xl { background: none !important; color: var(--s-a) !important; -webkit-text-fill-color: var(--s-a); }
}

/* Ответ к разбору — в правом верхнем углу, на уровне заголовка */
.sl .ans-tr { position: absolute; right: 96px; top: 62px; z-index: 2; }
.sl--sec:has(.sec-art) h2, .sl--sec:has(.sec-art) p { max-width: 820px; }
.sl .center svg.fig { margin-left: auto; margin-right: auto; }
.sl .pt--lg { gap: 10px; }
.sl .pt--lg .pt__e { min-height: 128px; padding: 12px 14px; }
.sl .pt--lg .pt__e b { font-size: 50px; }
.sl .pt--lg .pt__e i { font-size: 20px; }
.sl .pt--lg .pt__e small { font-size: 23px; }
.sl .ti-art svg, .sl .sec-art svg { max-width: 100%; height: auto; }
.sl--title .ti-art { width: 520px; right: 80px; }
.sl--title:has(.ti-art) h1, .sl--title:has(.ti-art) .ti-sub { max-width: 820px; }
.sl--sec .sec-art { width: 500px; display: flex; justify-content: center; }
.sl--title:has(.ti-art) h1 { font-size: 82px; }
.sl .big-f { font-size: 104px; line-height: 1.15; font-weight: 800; letter-spacing: -.01em; }
.sl table.tb td.big { white-space: nowrap; }
/* Титул задания 7: сетка формул по классам */
.sl .cls-art { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.sl .cls-art .tag { justify-content: center; padding: 16px 8px; border-radius: 22px; font-size: 32px; }
.sl:has(.ans-tr) > h2 { max-width: 1080px; }
/* Ряд активности металлов */
.sl .act-art, .sl .act-row { display: flex; flex-wrap: wrap; gap: 12px; }
.sl .act-art { width: 520px; justify-content: center; }
.sl .act-art span, .sl .act-row span { display: grid; place-items: center; min-width: 100px; height: 100px; padding: 0 10px; border-radius: 22px; font-size: 40px; font-weight: 850; color: var(--s-ink); background: color-mix(in srgb, var(--s-v) 16%, transparent); border: 1.5px solid color-mix(in srgb, var(--s-v) 45%, transparent); }
.sl .act-row { justify-content: center; gap: 10px; }
.sl .act-row span { min-width: 72px; height: 76px; font-size: 32px; border-radius: 18px; }
.sl .act-art span.h, .sl .act-row span.h { background: color-mix(in srgb, var(--s-a) 22%, transparent); border-color: var(--s-a); color: var(--s-a); }
.sl .act-art span.h ~ span, .sl .act-row span.n { background: color-mix(in srgb, var(--s-c) 14%, transparent); border-color: color-mix(in srgb, var(--s-c) 45%, transparent); }
.sl .ti-art .rx__eq { font-size: 30px; } .sl .ti-art .rx__arr { min-width: 70px; }
/* Титул задания 10: вещество → реагенты */
.sl .pair-art { display: grid; gap: 16px; }
.sl .pair-art div { display: grid; grid-template-columns: 150px 50px 1fr; align-items: center; padding: 18px 24px; border-radius: 22px; background: var(--s-card); border: 1.5px solid var(--s-line); font-size: 36px; font-weight: 800; }
.sl .pair-art b { color: var(--s-a); }
.sl .pair-art i { font-style: normal; color: var(--s-mut); }
.sl .pair-art span { color: var(--s-ink); white-space: nowrap; }
.sl table.tb.tb--sm td { padding: 10px 22px; } .sl table.tb.tb--sm th { padding: 12px 22px; }
.sl .types-art { display: grid; gap: 14px; }
.sl .types-art div { display: grid; grid-template-columns: 1fr 50px 1fr; align-items: center; padding: 16px 24px; border-radius: 22px; background: var(--s-card); border: 1.5px solid var(--s-line); font-size: 38px; font-weight: 850; }
.sl .types-art div:nth-child(1) b { color: var(--s-a); } .sl .types-art div:nth-child(2) b { color: var(--s-v); }
.sl .types-art div:nth-child(3) b { color: var(--s-c); } .sl .types-art div:nth-child(4) b { color: var(--s-g); }
.sl .types-art i { font-style: normal; color: var(--s-mut); text-align: center; }
/* Шкала степеней окисления (задание 15) */
.sl .ox-axis { display: grid; gap: 18px; width: 100%; }
.sl .ox-axis__n { display: grid; grid-template-columns: repeat(11, 1fr); gap: 6px; }
.sl .ox-axis__n span { display: grid; place-items: center; height: 64px; border-radius: 14px; background: var(--s-card2); border: 1.5px solid var(--s-line); font-size: 26px; font-weight: 850; }
.sl .ox-axis__n span.z { background: color-mix(in srgb, var(--s-a) 20%, transparent); border-color: var(--s-a); color: var(--s-a); }
.sl .ox-axis--big .ox-axis__n span { height: 96px; font-size: 38px; border-radius: 20px; }
.sl .ox-axis__a { position: relative; padding: 14px 24px; font-size: 24px; font-weight: 650; border-radius: 16px; }
.sl .ox-axis--big .ox-axis__a { font-size: 32px; }
.sl .ox-axis__a b { font-weight: 850; }
.sl .ox-axis__a--r { color: var(--s-g); background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--s-g) 18%, transparent)); text-align: right; }
.sl .ox-axis__a--l { color: var(--s-r); background: linear-gradient(270deg, transparent, color-mix(in srgb, var(--s-r) 18%, transparent)); }
.sl .ox-axis__a--r::after { content: "→"; margin-left: 12px; font-weight: 900; }
.sl .ox-axis__a--l::before { content: "←"; margin-right: 12px; font-weight: 900; }
.sl .ti-art .ox-axis__n { grid-template-columns: repeat(6, 1fr); }
.sl .def--r { background: linear-gradient(135deg, color-mix(in srgb, var(--s-r) 15%, transparent), color-mix(in srgb, var(--s-r) 4%, transparent)); border-color: color-mix(in srgb, var(--s-r) 45%, transparent); }
.sl .def--r::before { background: var(--s-r); } .sl .def--r small, .sl .def--r b { color: var(--s-r); }
.sl .cls-art--2 { grid-template-columns: 1fr 1fr; }
.sl .cls-art--2 .tag { font-size: 30px; }
/* Расчётные задания 18–22: формула и дроби */
.sl .calc-art { display: flex; justify-content: center; }
.sl .calc-art__f { margin: 0; padding: 34px 44px; border-radius: 30px; background: var(--s-card); border: 1.5px solid var(--s-line); font-size: 54px; font-weight: 800; white-space: nowrap; }
.sl .ti-art .calc-art__f { font-size: 36px; padding: 26px 24px; }
.sl .frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 .15em; font-size: .82em; line-height: 1.2; }
.sl .frac > span:first-child { padding: 0 .2em .08em; border-bottom: 4px solid currentColor; }
.sl .frac > span:last-child { padding: .08em .2em 0; }
.sl .mass-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.sl .mass-grid > span { display: flex; justify-content: space-between; align-items: baseline; padding: 18px 22px; border-radius: 18px; background: var(--s-card); border: 1.5px solid var(--s-line); font-size: 34px; font-weight: 850; color: var(--s-ink); }
.sl .mass-grid > span > b { color: var(--s-a); font-size: 30px; }
/* Электронный баланс (задание 20) */
.sl .bal { display: grid; gap: 12px; }
.sl .bal > div { display: grid; grid-template-columns: 1fr 90px 280px; align-items: center; gap: 16px; padding: 8px 24px; border-radius: 20px; background: var(--s-card); border: 1.5px solid var(--s-line); }
.sl .bal--big > div { grid-template-columns: 1fr 90px 90px 280px; }
.sl .bal__e { font-size: 40px; font-weight: 800; }
.sl .bal__k { display: grid; place-items: center; height: 64px; border-left: 3px solid var(--s-ink2); font-size: 40px; font-weight: 900; color: var(--s-a); }
.sl .bal__lcm { display: grid; place-items: center; font-size: 22px; font-weight: 900; color: var(--s-mut); border-left: 3px solid var(--s-ink2); height: 100%; }
.sl .bal__r { font-size: 26px; font-weight: 800; }
.sl .ti-art .bal > div { grid-template-columns: 1fr 60px; padding: 12px 18px; }
.sl .ti-art .bal__r { grid-column: 1 / -1; font-size: 22px; }
.sl .ti-art .bal__e { font-size: 34px; }
/* Цепочка превращений (задание 21) */
.sl .chain { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 12px 14px; }
.sl .chain > span { padding: 18px 26px; border-radius: 22px; background: var(--s-card); border: 1.5px solid var(--s-line); font-size: 44px; font-weight: 850; white-space: nowrap; }
.sl .chain > span.x { color: var(--s-a); border-color: var(--s-a); background: color-mix(in srgb, var(--s-a) 14%, transparent); }
.sl .chain i { font-style: normal; font-size: 44px; font-weight: 400; color: var(--s-mut); }
.sl .chain--sm > span { padding: 10px 20px; font-size: 36px; border-radius: 18px; }
.sl .chain--sm i { font-size: 36px; }
.sl .chain--xs > span { padding: 8px 14px; font-size: 28px; border-radius: 14px; }
.sl .chain--xs i { font-size: 28px; }
.sl .ti-art .chain { flex-wrap: wrap; }
.sl .ti-art .chain { gap: 10px; } .sl .ti-art .chain > span { font-size: 32px; padding: 12px 14px; } .sl .ti-art .chain i { font-size: 30px; }
.sl .chain--col { flex-direction: column; flex-wrap: nowrap; gap: 6px; } .sl .chain--col i { transform: rotate(90deg); line-height: 1; }
.sl .ti-art .chain--col > span { font-size: 48px; padding: 14px 30px; } .sl .ti-art .chain--col i { font-size: 40px; }
/* Схема расчёта (задание 22) */
.sl .flow { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.sl .flow > span { padding: 10px 26px; border-radius: 18px; background: var(--s-card); border: 1.5px solid var(--s-line); font-size: 36px; font-weight: 850; }
.sl .flow > span.x { color: var(--s-a); border-color: var(--s-a); background: color-mix(in srgb, var(--s-a) 14%, transparent); }
.sl .flow i { font-style: normal; font-size: 21px; font-weight: 800; color: var(--s-mut); }
.sl .flow i::before { content: "↓ "; color: var(--s-c); }
.sl .mass-grid--3 { grid-template-columns: repeat(3, 1fr); }