/* Парабола — дизайн-система «экзаменационный бланк»: бумага, чернила, красная ручка проверяющего,
   ячейки бланка ответов, засечные заголовки Spectral, текст IBM Plex Sans, цифры IBM Plex Mono. */
:root {
  --paper: #f5f1e8; --paper-2: #fffdf8; --paper-3: #ebe5d7;
  --ink: #17181a; --ink-2: #47464a; --ink-3: #77747a;
  --rule: #d8d0bf; --rule-2: #c3b9a4;
  --pen: #c8361c;          /* красная ручка */
  --pen-soft: #f6ddd5;
  --blue: #1f3d8f;         /* шариковая ручка */
  --blue-soft: #dfe5f4;
  --ok: #1f7a4c; --ok-bg: #dcefe3; --bad: #b4271b; --bad-bg: #f8dcd6;
  --hl: #f4d77a;           /* маркер */
  --f-head: "Spectral", Georgia, "Times New Roman", serif;
  --f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-num: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --x-oge: #c8361c; --x-baza: #1f7a4c; --x-profil: #1f3d8f; --x-teoriya: #8a5a12; --x-strategiya: #6b3fa0; --x-trenazhery: #0f6f7c; --x-spravochnik: #5b5f66;
  --w: 1180px; --gut: clamp(16px, 4vw, 40px);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #141517; --paper-2: #1b1d20; --paper-3: #24272b; --ink: #ece6da; --ink-2: #c3bdb1; --ink-3: #8f8a81;
    --rule: #33363b; --rule-2: #4a4e55; --pen: #ff7a55; --pen-soft: #3a2018; --blue: #8fb0ff; --blue-soft: #1c2640;
    --ok: #6fd39b; --ok-bg: #173325; --bad: #ff8a7a; --bad-bg: #3a1c18; --hl: #8a6d1d;
    --x-oge: #ff7a55; --x-baza: #6fd39b; --x-profil: #8fb0ff; --x-teoriya: #e0b25a; --x-strategiya: #c39bff; --x-trenazhery: #5fd0dc; --x-spravochnik: #b4b8bf;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #141517; --paper-2: #1b1d20; --paper-3: #24272b; --ink: #ece6da; --ink-2: #c3bdb1; --ink-3: #8f8a81;
  --rule: #33363b; --rule-2: #4a4e55; --pen: #ff7a55; --pen-soft: #3a2018; --blue: #8fb0ff; --blue-soft: #1c2640;
  --ok: #6fd39b; --ok-bg: #173325; --bad: #ff8a7a; --bad-bg: #3a1c18; --hl: #8a6d1d;
  --x-oge: #ff7a55; --x-baza: #6fd39b; --x-profil: #8fb0ff; --x-teoriya: #e0b25a; --x-strategiya: #c39bff; --x-trenazhery: #5fd0dc; --x-spravochnik: #b4b8bf;
  color-scheme: dark;
}
.x-oge { --x: var(--x-oge); } .x-baza { --x: var(--x-baza); } .x-profil { --x: var(--x-profil); } .x-teoriya { --x: var(--x-teoriya); }
.x-strategiya { --x: var(--x-strategiya); } .x-trenazhery { --x: var(--x-trenazhery); } .x-spravochnik { --x: var(--x-spravochnik); }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 1.0625rem/1.68 var(--f-body); overflow-x: hidden; }
img, svg, canvas { max-width: 100%; }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--pen); }
:focus-visible { outline: 2px solid var(--pen); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--f-head); font-weight: 700; line-height: 1.15; letter-spacing: -.01em; overflow-wrap: break-word; text-wrap: balance; }
.wrap { width: min(100% - 2 * var(--gut), var(--w)); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: .5rem 1rem; z-index: 50; }
.skip:focus { left: 8px; }
.muted { color: var(--ink-3); }
.num { font-family: var(--f-num); font-feature-settings: "tnum"; }

/* ── Шапка ─────────────────────────────────── */
.top { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--ink); }
.top .wrap { display: flex; align-items: center; gap: .9rem; min-height: 62px; }
.logo { display: inline-flex; align-items: center; gap: .55rem; color: var(--ink); text-decoration: none; font: 700 1.35rem/1 var(--f-head); }
.logo svg { width: 30px; height: 30px; flex: none; }
.nav { display: flex; gap: 0; margin-left: auto; }
.nav a { color: var(--ink); text-decoration: none; font: 500 .92rem var(--f-body); padding: .5rem .7rem; border-left: 1px solid var(--rule); }
.nav a:last-child { border-right: 1px solid var(--rule); }
.nav a:hover { background: var(--paper-3); color: var(--ink); }
.nav a[aria-current="page"] { box-shadow: inset 0 -3px 0 var(--pen); }
.icon-btn { width: 40px; height: 40px; display: inline-grid; place-items: center; border: 1px solid var(--ink); background: transparent; color: var(--ink); cursor: pointer; border-radius: 0; }
.icon-btn:hover { background: var(--ink); color: var(--paper); }
.icon-btn svg { width: 19px; height: 19px; }
.menu-btn { display: none; }
@media (max-width: 1040px) {
  .menu-btn { display: inline-grid; margin-left: auto; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 62px; flex-direction: column; background: var(--paper-2); border-bottom: 1px solid var(--ink); padding: .4rem var(--gut) .8rem; }
  .nav.open { display: flex; }
  .nav a { border: 0; border-bottom: 1px solid var(--rule); padding: .8rem 0; font-size: 1rem; }
  .nav a:last-child { border-right: 0; }
}

/* ── Кнопки ─────────────────────────────────── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .45rem; min-height: 46px; padding: .55rem 1.2rem; border: 1.5px solid var(--ink); background: var(--ink); color: var(--paper); font: 600 .97rem var(--f-body); cursor: pointer; text-decoration: none; border-radius: 0; }
.btn:hover { background: var(--pen); border-color: var(--pen); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.pen { background: var(--pen); border-color: var(--pen); color: #fff; }
.btn.pen:hover { background: var(--ink); border-color: var(--ink); }
.btn.sm { min-height: 38px; padding: .3rem .85rem; font-size: .9rem; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.row { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }

/* ── Главная ─────────────────────────────────── */
.hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 3.5rem); padding-block: clamp(2rem, 5vw, 4rem) 2rem; align-items: center; }
@media (max-width: 900px) { .hero { grid-template-columns: minmax(0, 1fr); } }
.kicker { font: 600 .78rem/1 var(--f-num); letter-spacing: .14em; text-transform: uppercase; color: var(--pen); margin: 0 0 1rem; }
.hero h1 { font-size: clamp(2.1rem, 1.2rem + 3.3vw, 3.9rem); margin: 0 0 1.1rem; }
.hero h1 em { font-style: italic; font-weight: 400; color: var(--pen); }
.hero p.sub { font-size: 1.14rem; color: var(--ink-2); max-width: 52ch; margin: 0 0 1.5rem; }
.plot { background: var(--paper-2); border: 1.5px solid var(--ink); box-shadow: 8px 8px 0 var(--ink); }
.plot-head { display: flex; justify-content: space-between; align-items: center; gap: .5rem; padding: .55rem .9rem; border-bottom: 1px solid var(--ink); font: 600 .78rem var(--f-num); letter-spacing: .1em; text-transform: uppercase; }
.plot canvas { display: block; width: 100%; height: auto; }
.plot-ctl { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.plot-ctl label { display: grid; gap: .2rem; padding: .55rem .8rem; border-right: 1px solid var(--rule); font: 600 .85rem var(--f-num); }
.plot-ctl label:last-child { border-right: 0; }
.plot-ctl input[type=range] { width: 100%; accent-color: var(--pen); }
.plot-out { display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; padding: .6rem .9rem; border-top: 1px solid var(--rule); font: 500 .92rem var(--f-num); }
.plot-out b { color: var(--pen); font-weight: 600; }
.formula { font: 500 1.05rem var(--f-num); text-transform: none; letter-spacing: 0; }

.section { padding-block: clamp(2rem, 5vw, 3.4rem); border-top: 1px solid var(--ink); }
.section > h2 { font-size: clamp(1.7rem, 1.2rem + 1.6vw, 2.5rem); margin: 0 0 .5rem; }
.section > .sub { color: var(--ink-2); max-width: 64ch; margin: 0 0 1.6rem; }
.sec-head { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1rem; align-items: baseline; }
.sec-head .no { font: 600 .9rem var(--f-num); color: var(--pen); }

/* Бланк номеров: сетка ячеек как в бланке ответов */
.sheet-nums { display: grid; gap: 1.6rem; }
.exam-row { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 1rem; align-items: start; }
@media (max-width: 700px) { .exam-row { grid-template-columns: minmax(0, 1fr); } }
.exam-row h3 { margin: 0; font-size: 1.25rem; }
.exam-row h3 small { display: block; font: 500 .82rem var(--f-body); color: var(--ink-3); margin-top: .3rem; }
.cells { display: grid; grid-template-columns: repeat(auto-fill, minmax(46px, 1fr)); border-top: 1.5px solid var(--ink); border-left: 1.5px solid var(--ink); }
.cells a { display: grid; place-items: center; aspect-ratio: 1; border-right: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); font: 600 1.05rem var(--f-num); color: var(--ink); text-decoration: none; background: var(--paper-2); position: relative; }
.cells a.p2 { background: var(--paper-3); }
.cells a:hover { background: var(--x, var(--pen)); color: #fff; }
.cells a .tip { position: absolute; left: 50%; bottom: calc(100% + 6px); transform: translateX(-50%); background: var(--ink); color: var(--paper); font: 500 .78rem/1.3 var(--f-body); padding: .35rem .55rem; white-space: nowrap; pointer-events: none; opacity: 0; transition: opacity .12s; z-index: 5; }
.cells a:hover .tip, .cells a:focus .tip { opacity: 1; }
.legend { display: flex; gap: 1rem; flex-wrap: wrap; font-size: .85rem; color: var(--ink-3); margin-top: .5rem; }
.legend i { display: inline-block; width: 14px; height: 14px; border: 1.5px solid var(--ink); vertical-align: -2px; margin-right: .35rem; }

/* Карточки-страницы: «листы» с номером */
.leaves { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 0; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.leaf { display: grid; gap: .35rem; align-content: start; padding: 1.05rem 1.1rem 1.2rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); text-decoration: none; color: var(--ink); background: var(--paper-2); position: relative; min-width: 0; }
.leaf::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--x, var(--pen)); }
.leaf:hover { background: var(--paper-3); color: var(--ink); }
.leaf i { font: 600 .74rem var(--f-num); letter-spacing: .08em; text-transform: uppercase; color: var(--x, var(--pen)); font-style: normal; }
.leaf b { font: 700 1.12rem/1.25 var(--f-head); }
.leaf span { color: var(--ink-2); font-size: .93rem; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); counter-reset: s; border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
@media (max-width: 900px) { .steps { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 520px) { .steps { grid-template-columns: minmax(0, 1fr); } }
.steps li { counter-increment: s; padding: 1rem 1.1rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--paper-2); }
.steps li::before { content: counter(s, decimal-leading-zero); display: block; font: 600 1.6rem var(--f-num); color: var(--pen); margin-bottom: .2rem; }
.steps b { display: block; font: 700 1.1rem var(--f-head); margin-bottom: .2rem; }
.steps span { color: var(--ink-2); font-size: .95rem; }
.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--ink); }
@media (max-width: 760px) { .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.facts div { padding: 1rem; border-right: 1px solid var(--rule); }
.facts div:last-child { border-right: 0; }
.facts b { display: block; font: 600 2rem/1.1 var(--f-num); }
.facts span { font-size: .9rem; color: var(--ink-2); }
.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.5rem 2.5rem; }
@media (max-width: 760px) { .two { grid-template-columns: minmax(0, 1fr); } }
.two h3 { margin: 0 0 .4rem; font-size: 1.25rem; }
.two p { margin: 0; color: var(--ink-2); }

/* ── Статья ─────────────────────────────────── */
.crumbs { display: flex; flex-wrap: wrap; gap: .4rem; font: 500 .82rem var(--f-num); color: var(--ink-3); padding-top: 1.3rem; }
.crumbs a { color: var(--ink-2); }
.page-head { padding-block: .8rem 1.4rem; border-bottom: 1.5px solid var(--ink); margin-bottom: 1.4rem; }
.page-head h1 { font-size: clamp(1.9rem, 1.2rem + 2.4vw, 3.1rem); margin: .5rem 0 .9rem; max-width: 26ch; }
.task-no { display: inline-flex; align-items: center; gap: .5rem; font: 600 .82rem var(--f-num); letter-spacing: .1em; text-transform: uppercase; color: var(--x, var(--pen)); }
.task-no b { display: inline-grid; place-items: center; min-width: 2.2rem; height: 2.2rem; padding: 0 .3rem; border: 1.5px solid currentColor; font-size: 1.05rem; letter-spacing: 0; }
.meta-line { display: flex; flex-wrap: wrap; gap: .35rem .9rem; font: 500 .82rem var(--f-num); color: var(--ink-3); margin-bottom: 1rem; }
.meta-line span + span::before { content: "·"; margin-right: .9rem; color: var(--rule-2); }
.lead p { text-align: left !important; font-size: 1.16rem; line-height: 1.6; max-width: 70ch; margin: 0; }
.paper { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: clamp(1.2rem, 3vw, 2.8rem); align-items: start; }
@media (max-width: 980px) { .paper { grid-template-columns: minmax(0, 1fr); } }
.margin { position: sticky; top: 80px; font-size: .9rem; max-height: calc(100vh - 100px); overflow: auto; }
@media (max-width: 980px) { .margin { position: static; max-height: none; } }
.toc details > summary { list-style: none; cursor: pointer; font: 600 .74rem var(--f-num); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); padding-bottom: .5rem; border-bottom: 1px solid var(--ink); }
.toc details > summary::-webkit-details-marker { display: none; }
.toc ol { list-style: none; margin: 0; padding: 0; counter-reset: t; }
.toc li { counter-increment: t; border-bottom: 1px solid var(--rule); }
.toc a { display: grid; grid-template-columns: 2.1rem minmax(0, 1fr); padding: .42rem 0; color: var(--ink-2); text-decoration: none; line-height: 1.35; }
.toc a::before { content: "§" counter(t); font: 500 .78rem var(--f-num); color: var(--ink-3); padding-top: .12rem; }
.toc a:hover, .toc a.on { color: var(--pen); }
.toc a.on::before { color: var(--pen); }
.margin .note-pen { margin-top: 1.2rem; font: 400 italic 1.05rem/1.4 var(--f-head); color: var(--pen); border-left: 2px solid var(--pen); padding-left: .7rem; }

.body { min-width: 0; max-width: 760px; border-left: 2px solid var(--pen-soft); padding-left: clamp(0rem, 2.5vw, 1.8rem); }
@media (max-width: 980px) { .body { border-left: 0; padding-left: 0; } }
.body h2 { font-size: clamp(1.45rem, 1.1rem + 1vw, 1.95rem) !important; margin: 2.4rem 0 .8rem; padding-top: .9rem; border-top: 1px solid var(--ink); }
.body h2:first-child { margin-top: 0; }
.body h3 { font-size: clamp(1.15rem, 1rem + .4vw, 1.35rem) !important; margin: 1.7rem 0 .5rem; }
.body p { margin: 0 0 1rem; text-align: left !important; hyphens: auto; }
.body ul, .body ol { margin: 0 0 1.2rem; padding: 0; list-style: none; }
.body li { position: relative; padding-left: 1.7rem; margin-bottom: .55rem; }
.big-dash-list li::before { content: ""; position: absolute; left: .2rem; top: .78em; width: .8rem; height: 1.5px; background: var(--pen); }
.custom-num-list { counter-reset: n; }
.custom-num-list li { counter-increment: n; padding-left: 2.3rem; }
.custom-num-list li::before { content: counter(n); position: absolute; left: 0; top: .1em; width: 1.6rem; height: 1.6rem; display: grid; place-items: center; border: 1.5px solid var(--ink); font: 600 .82rem var(--f-num); }
.text-blue { color: var(--blue); } .b-500 { font-weight: 600; } .mb-3 { margin-bottom: 1.2rem; }
.body blockquote { margin: 1.4rem 0; padding: .9rem 1.1rem; background: var(--paper-2); border: 1px solid var(--ink); position: relative; }
.body blockquote p:last-child { margin-bottom: 0; }
.body blockquote.myth { border-color: var(--pen); background: var(--pen-soft); }
.body blockquote.myth::before { content: "МИФ"; position: absolute; top: -.7rem; left: .9rem; background: var(--pen); color: #fff; font: 600 .7rem var(--f-num); letter-spacing: .12em; padding: .15rem .45rem; }
.body blockquote.note { border-color: var(--blue); background: var(--blue-soft); }
.body blockquote.note::before { content: "NB"; position: absolute; top: -.7rem; left: .9rem; background: var(--blue); color: #fff; font: 600 .7rem var(--f-num); letter-spacing: .12em; padding: .15rem .45rem; }
.body blockquote.task { border: 1.5px solid var(--ink); background: var(--paper-2); }
.body blockquote.task::before { content: "ЗАДАЧА"; position: absolute; top: -.7rem; left: .9rem; background: var(--ink); color: var(--paper); font: 600 .7rem var(--f-num); letter-spacing: .12em; padding: .15rem .45rem; }
.tbl { overflow-x: auto; margin: 0 0 1.3rem; border: 1px solid var(--ink); }
.body table { width: 100%; border-collapse: collapse !important; font-size: .95rem; background: var(--paper-2); }
.body td, .body th { border: 0 !important; border-bottom: 1px solid var(--rule) !important; border-right: 1px solid var(--rule) !important; padding: .55rem .75rem; vertical-align: top; text-align: left; }
.body tr[style*="background"] { background: transparent !important; }
.body tr[style*="background"] td { background: var(--paper-3); font-weight: 600; font-family: var(--f-body); }
.body tbody tr:last-child td { border-bottom: 0 !important; }
.body sup a { font: 600 .72rem var(--f-num); text-decoration: none; color: var(--pen); }
.body figure { margin: 1.4rem 0; border: 1px solid var(--ink); background: var(--paper-2); padding: .8rem; }
.body figure svg { display: block; margin: 0 auto; max-height: 340px; color: var(--ink); }
.body figcaption { font-size: .85rem; color: var(--ink-3); margin-top: .5rem; text-align: center; }
.katex { font-size: 1.06em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: .4rem 0; margin: .8rem 0 1.1rem; }
.math-err { color: var(--bad); font-family: var(--f-num); }

.related { margin-block: 3rem 1rem; }
.related h2 { font-size: 1.5rem; margin: 0 0 1rem; }

/* ── Инструменты: «бланк» ─────────────────────── */
.tool { margin: 1.6rem 0 2rem; background: var(--paper-2); border: 1.5px solid var(--ink); box-shadow: 6px 6px 0 var(--ink); }
.tool-head { display: flex; align-items: center; gap: .6rem; flex-wrap: wrap; padding: .55rem .9rem; border-bottom: 1.5px solid var(--ink); background: var(--paper-3); }
.tool-head .t { font: 600 .76rem var(--f-num); letter-spacing: .12em; text-transform: uppercase; }
.tool-head .sp { flex: 1; }
.tool-head .cnt { font: 500 .82rem var(--f-num); color: var(--ink-2); }
.tool-body { padding: 1rem 1.1rem 1.2rem; }
.tool-foot { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; padding: .7rem 1.1rem; border-top: 1px solid var(--rule); }
.tool .muted { font-size: .9rem; }
.q { font-size: 1.08rem; line-height: 1.65; margin: 0 0 1rem; }
.q svg { display: block; margin: .6rem auto; max-height: 280px; color: var(--ink); }
.ans { display: flex; flex-wrap: wrap; gap: .8rem; align-items: flex-end; }
.ans label { font: 600 .74rem var(--f-num); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); display: grid; gap: .3rem; }
.ans input { width: min(100%, 290px); height: 50px; border: 1.5px solid var(--ink); border-radius: 0; background-image: repeating-linear-gradient(90deg, transparent 0 33px, var(--rule) 33px 34px); background-color: var(--paper-2); color: var(--ink); padding: 0 .55rem; font: 600 1.25rem var(--f-num); letter-spacing: .33em; }
.ans input:focus { outline: 2px solid var(--blue); outline-offset: 1px; }
.verdict { margin-top: .9rem; padding: .7rem .9rem; border: 1.5px solid; font-weight: 600; }
.verdict.ok { border-color: var(--ok); background: var(--ok-bg); color: var(--ok); }
.verdict.bad { border-color: var(--bad); background: var(--bad-bg); color: var(--bad); }
.sol { margin-top: .9rem; padding: .8rem 1rem; border-left: 3px solid var(--pen); background: var(--paper); font-size: .98rem; }
.sol p { margin: 0 0 .5rem; }
.sol p:last-child { margin: 0; }
.chooser { display: flex; flex-wrap: wrap; gap: 0; border: 1px solid var(--ink); width: fit-content; max-width: 100%; }
.chooser button { border: 0; border-right: 1px solid var(--ink); background: transparent; color: var(--ink); font: 600 .85rem var(--f-num); padding: .45rem .75rem; cursor: pointer; }
.chooser button:last-child { border-right: 0; }
.chooser button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.opts { display: grid; gap: .5rem; margin-top: .4rem; }
.opts button { text-align: left; border: 1.5px solid var(--ink); background: var(--paper-2); color: var(--ink); padding: .65rem .85rem; font: 500 1rem var(--f-body); cursor: pointer; display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: .4rem; }
.opts button b { font-family: var(--f-num); }
.opts button:hover { background: var(--paper-3); }
.opts button.ok { border-color: var(--ok); background: var(--ok-bg); }
.opts button.bad { border-color: var(--bad); background: var(--bad-bg); }
.streak { display: flex; gap: 3px; flex-wrap: wrap; }
.streak i { width: 12px; height: 12px; border: 1px solid var(--ink); }
.streak i.ok { background: var(--ok); border-color: var(--ok); } .streak i.bad { background: var(--bad); border-color: var(--bad); }
.ctl { display: grid; gap: .3rem; min-width: 0; }
.ctl label { font: 600 .74rem var(--f-num); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.ctl input, .ctl select { height: 44px; border: 1.5px solid var(--ink); border-radius: 0; background: var(--paper-2); color: var(--ink); padding: 0 .6rem; font: 500 1rem var(--f-body); min-width: 0; }
.grid-ctl { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 180px), 1fr)); gap: .8rem; }
.out-cells { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 160px), 1fr)); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); margin-top: 1rem; }
.out-cells div { padding: .7rem .8rem; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.out-cells b { display: block; font: 600 1.5rem/1.15 var(--f-num); }
.out-cells span { font-size: .82rem; color: var(--ink-2); }
.var-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 330px), 1fr)); gap: 1rem; }
.var-item { border: 1px solid var(--ink); padding: .8rem .9rem; background: var(--paper); min-width: 0; }
.var-item h4 { margin: 0 0 .4rem; font: 600 .82rem var(--f-num); letter-spacing: .08em; text-transform: uppercase; }
.var-item.ok { border-color: var(--ok); background: var(--ok-bg); } .var-item.bad { border-color: var(--bad); background: var(--bad-bg); }
.var-item .ans input { height: 44px; font-size: 1.1rem; width: 100%; }
.timer { font: 600 1.2rem var(--f-num); }
.heat { display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); border-top: 1.5px solid var(--ink); border-left: 1.5px solid var(--ink); }
.heat a, .heat span { display: grid; place-items: center; aspect-ratio: 1; border-right: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); text-decoration: none; color: var(--ink); font: 600 1rem/1.1 var(--f-num); text-align: center; }
.heat small { display: block; font-size: .65rem; font-weight: 500; }
.heat .h0 { background: var(--paper-2); } .heat .h1 { background: var(--bad-bg); } .heat .h2 { background: color-mix(in srgb, var(--hl) 55%, var(--paper-2)); } .heat .h3 { background: var(--ok-bg); }
.cv-wrap { border: 1px solid var(--ink); background: #fff; }
:root[data-theme="dark"] .cv-wrap { background: #fdfbf6; }
.cv-wrap canvas { display: block; width: 100%; height: auto; }
.chk-list { display: grid; gap: .4rem; }
.chk-list label { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: .6rem; align-items: start; padding: .5rem .2rem; border-bottom: 1px solid var(--rule); cursor: pointer; }
.chk-list input { width: 18px; height: 18px; accent-color: var(--pen); margin-top: .2rem; }
.meter { height: 10px; border: 1px solid var(--ink); background: var(--paper); }
.meter i { display: block; height: 100%; background: var(--pen); }
.week { border: 1px solid var(--ink); margin-top: .7rem; }
.week div { display: grid; grid-template-columns: 110px minmax(0, 1fr); border-bottom: 1px solid var(--rule); }
.week div:last-child { border-bottom: 0; }
.week b { padding: .5rem .7rem; font: 600 .82rem var(--f-num); border-right: 1px solid var(--rule); background: var(--paper-3); }
.week span { padding: .5rem .7rem; font-size: .93rem; }

/* ── Служебные ─────────────────────────────────── */
.search-box { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: 1.4rem; }
.search-box input { flex: 1 1 260px; height: 52px; border: 1.5px solid var(--ink); border-radius: 0; background: var(--paper-2); color: var(--ink); padding: 0 1rem; font: 500 1.05rem var(--f-body); }
.search-res { display: grid; gap: 0; border-top: 1px solid var(--ink); }
.search-res a { display: block; padding: .8rem 0; border-bottom: 1px solid var(--rule); text-decoration: none; color: var(--ink); }
.search-res a b { display: block; font: 700 1.1rem var(--f-head); }
.search-res a span { color: var(--ink-2); font-size: .93rem; }
.search-res a i { font: 600 .72rem var(--f-num); color: var(--pen); font-style: normal; text-transform: uppercase; letter-spacing: .08em; }
.sitemap-group { break-inside: avoid; margin-bottom: 1.8rem; }
.sitemap-group h2 { font-size: 1.3rem; border-bottom: 1px solid var(--ink); padding-bottom: .3rem; }
.sitemap-group ul { margin: 0; padding-left: 1.1rem; columns: 2 300px; }
.err-404 { padding-block: 4rem; max-width: 680px; }
.err-404 .big { font: 600 clamp(5rem, 3rem + 10vw, 9rem)/1 var(--f-num); color: var(--pen); }
.err-404 .stamp { display: inline-block; border: 2px solid var(--pen); color: var(--pen); font: 600 .9rem var(--f-num); letter-spacing: .12em; text-transform: uppercase; padding: .3rem .7rem; transform: rotate(-3deg); margin-bottom: 1rem; }
.hub-intro { max-width: 72ch; color: var(--ink-2); margin-bottom: 1.6rem; }
.page { max-width: 760px; }
.page h2 { font-size: 1.5rem; margin: 2rem 0 .6rem; }

/* ── Подвал ─────────────────────────────────── */
.foot { margin-top: 4rem; border-top: 1.5px solid var(--ink); background: var(--paper-2); font-size: .92rem; }
.foot .cols { display: grid; grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr)); gap: 2rem; padding-block: 2.4rem; }
@media (max-width: 860px) { .foot .cols { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 520px) { .foot .cols { grid-template-columns: minmax(0, 1fr); } }
.foot h3 { font: 600 .76rem var(--f-num); letter-spacing: .14em; text-transform: uppercase; margin: 0 0 .7rem; }
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .35rem; }
.foot a { color: var(--ink-2); }
.foot p { color: var(--ink-2); margin: .6rem 0 0; }
.foot .bar { border-top: 1px solid var(--rule); padding-block: 1rem; font: 500 .8rem var(--f-num); color: var(--ink-3); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }
@media print { .top, .foot, .margin, .tool, .related { display: none !important; } body { background: #fff; } .paper { display: block; } .body { border: 0; padding: 0; } }