/* Задачник harmful.online — «Тетрадь» (редизайн 02.11.2026). Поверх /assets/styles.css: шрифты и токены сайта
   (--bg, --ink, --accent, --rule, --sans/--serif/--mono). Одна колонка и одна ось на всех экранах (--p-col),
   лист в клетку, решённое «закрашивается чернилами». Рамка с тенью — только у листа задачи; остальное — строки
   и тонкие линии. Тёмная тема по настройке устройства: токены сайта переопределяются только на этой странице,
   чтобы подвал и карточка cookie не остались светлыми пятнами. */

body[data-page="practice"] {
  --p-paper: #fffdf9;
  --p-grid: rgba(167, 70, 42, .055);
  --p-doing: #efd9a6;
  --p-doing-ink: #4f3b0f;
  --p-hard-bg: #fbeee6;
  --p-ok: #2d6a4f;
  --p-ok-bg: #e2efe6;
  --p-part: #7d5210;
  --p-part-bg: #f5ead2;
  --p-track: #e4d9c6;
  --p-new: #8f8574;
  --p-focus: #2b5fb4;
  --p-shadow: rgba(23, 22, 26, .9);
  --p-heat-1: #ecd9b4; --p-heat-2: #d9b06a; --p-heat-3: #b9822f; --p-heat-4: #7d5210;
  --p-col: 50rem;
}
@media (prefers-color-scheme: dark) {
  html:has(body[data-page="practice"]) { background: #1d1b18; color-scheme: dark; }
  body[data-page="practice"] {
    --bg: #1d1b18; --bg-2: #25221e; --ink: #f3eee5; --ink-2: #d2c9bb; --meta: #a8a092; --rule: #4a443b;
    --accent: #e8875c; --accent-ink: #f2a581; --accent-bg: #3a2820;
    --p-paper: #25221e;
    --p-grid: rgba(243, 238, 229, .035);
    --p-doing: #5e4c1f;
    --p-doing-ink: #f6e2ae;
    --p-hard-bg: #3a2620;
    --p-ok: #8fcaa3;
    --p-ok-bg: #1d3328;
    --p-part: #e5bf6e;
    --p-part-bg: #3a3020;
    --p-track: #403a32;
    --p-new: #847b6e;
    --p-focus: #8cb4ff;
    --p-shadow: rgba(0, 0, 0, .55);
    --p-heat-1: #5e4b25; --p-heat-2: #7a6230; --p-heat-3: #b9924a; --p-heat-4: #f0d58c;
    color-scheme: dark;
  }
  body[data-page="practice"] .ft { --ft-meta: #b0a796; --ft-grid: rgba(74, 68, 59, .7); }
  body[data-page="practice"] .pr-statement img, body[data-page="practice"] .pr-rich img { background: #fff; border-radius: 4px; }
}

/* ---------- основа ---------- */
.pr { min-height: 60vh; background: var(--bg); }
.pr [hidden] { display: none !important; }
.pr h1:focus { outline: none; }
/* только свои иконки: SVG внутри KaTeX (стрелки векторов, корни) не трогаем */
.pr svg:not(.katex svg) { width: 1em; height: 1em; flex: none; }
.pr-boot { padding: var(--s5) var(--s3); }
.pr-boot-text { color: var(--meta); margin-top: var(--s2); }
.pr-vh { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; margin: -1px; padding: 0; border: 0; }

.pr-col, .pr-bar { max-width: calc(var(--p-col) + 2.5rem); margin: 0 auto; padding-left: max(1.25rem, env(safe-area-inset-left, 0px)); padding-right: max(1.25rem, env(safe-area-inset-right, 0px)); }
.pr-page { padding: 1.6rem 0 4.5rem; }
.pr-page.is-wide .pr-col { max-width: 84rem; }
.pr-eyebrow { font: 500 .72rem/1.3 var(--mono); letter-spacing: .09em; text-transform: uppercase; color: var(--meta); margin: 0 0 .5rem; }
.pr-lead { color: var(--ink-2); max-width: 40rem; margin: .6rem 0 0; }
.pr-code { font: 500 .74rem/1 var(--mono); letter-spacing: .02em; color: var(--meta); }
.pr-stp-code { font: 600 1rem/1.4 var(--mono); color: var(--ink); user-select: all; white-space: nowrap; }
.pr-gl { display: inline-flex; font-size: .95em; }
.pr-h2 { font: 700 1.3rem/1.2 var(--serif); margin: 2.2rem 0 .8rem; }
.pr-row { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; margin: 1rem 0 0; }
.pr-note { margin: .6rem 0 0; font-size: .875rem; color: var(--ink-2); }
.pr-note:empty { display: none; }
.pr-fine { font-size: .78rem; line-height: 1.45; color: var(--meta); margin: .7rem 0 0; }
.pr-sub { font-size: .875rem; color: var(--meta); margin: 0 0 1rem; max-width: 40rem; }
.pr-empty-note { font-size: .9rem; color: var(--ink-2); }
.pr .up { color: var(--p-ok); }
.pr .down { color: var(--accent-ink); }

/* кнопки и ссылки */
.pr-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem; min-height: 2.9rem; padding: .65rem 1.15rem;
  border: 1.5px solid var(--ink); background: var(--ink); color: var(--bg); font: 600 .95rem/1.2 var(--sans);
  text-decoration: none; cursor: pointer; transition: background-color .12s, border-color .12s, transform .12s;
}
.pr-btn:hover { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.pr-btn:active { transform: translateY(1px); }
.pr-btn:disabled { opacity: .55; cursor: default; }
.pr-btn-lg { min-height: 3.25rem; padding: .8rem 1.4rem; font-size: 1.02rem; }
.pr-btn-line { background: transparent; color: var(--ink); }
.pr-btn-line:hover { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.pr-btn-danger { background: var(--accent-ink); border-color: var(--accent-ink); color: var(--bg); }
.pr-btn-go { background: var(--p-ok); border-color: var(--p-ok); color: var(--bg); }
.pr-btn-go:hover { background: var(--ink); border-color: var(--ink); }
.pr-link { background: none; border: 0; padding: .4rem .2rem; font: inherit; font-size: .95rem; color: var(--accent-ink); text-decoration: underline; text-underline-offset: .2em; text-decoration-thickness: 1px; cursor: pointer; min-height: 2.75rem; display: inline-flex; align-items: center; }
.pr-link:hover { color: var(--ink); }
.pr-link:disabled { opacity: .55; cursor: default; }
.pr a:focus-visible, .pr button:focus-visible, .pr summary:focus-visible, .pr input:focus-visible { outline: 3px solid var(--p-focus); outline-offset: 2px; }

.pr-meter { display: block; height: 4px; background: var(--p-track); overflow: hidden; }
.pr-meter i { display: block; height: 100%; background: var(--ink); }

/* уровни задач и состояния тем: всегда словом, цвет только помогает */
.pr-lv { display: inline-flex; align-items: center; font: 500 .7rem/1 var(--mono); letter-spacing: .03em; padding: .22rem .4rem; border: 1px solid var(--rule); color: var(--ink-2); white-space: nowrap; }
.pr-lv.lv-core { border-color: var(--ink); background: var(--ink); color: var(--bg); }
.pr-lv.lv-star, .pr-lv.lv-star2 { border-color: var(--accent); color: var(--accent-ink); }
.pr-st { display: inline-flex; align-items: center; gap: .3rem; font-size: .8rem; font-weight: 600; white-space: nowrap; }
.pr-st.is-done { color: var(--p-ok); }
.pr-st.is-hard { color: var(--accent-ink); }

/* ---------- полоса задачника ---------- */
.pr-nav { background: var(--dark); color: var(--on-dark); border-top: 1px solid #37322b; }
.pr-nav .pr-bar { display: flex; align-items: stretch; gap: .25rem; min-height: 3rem; }
.pr-nav-logo { display: flex; align-items: center; font: 700 1.05rem/1 var(--serif); color: var(--on-dark); text-decoration: none; margin-right: 1.2rem; }
.pr-nav-tabs { display: flex; align-items: stretch; min-width: 0; }
.pr-nav-tabs a { display: flex; align-items: center; padding: 0 .9rem; color: var(--on-dark-2); text-decoration: none; font-size: .95rem; border-bottom: 3px solid transparent; white-space: nowrap; }
.pr-nav-tabs a:hover { color: var(--on-dark); }
.pr-nav-tabs a.is-here { color: var(--on-dark); border-bottom-color: var(--accent-lit); }
.pr-nav a:focus-visible { outline: 3px solid #8cb4ff; outline-offset: -3px; }

.pr-crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: .1rem .6rem; font-size: .875rem; color: var(--meta); margin: -.4rem 0 .6rem; }
.pr-crumbs a { display: inline-flex; align-items: center; gap: .3rem; color: var(--ink); font-weight: 600; text-decoration: none; min-height: 2.75rem; }
.pr-crumbs a:hover { color: var(--accent-ink); }
.pr-crumbs .sep { color: var(--rule); }

/* ---------- заголовок экрана ---------- */
.pr-head { margin-bottom: 1.6rem; }
.pr-head h1, .pr-empty h1, .pr-land h1 { font: 700 clamp(2rem, 1.4rem + 2vw, 2.9rem)/1.06 var(--serif); letter-spacing: -0.022em; margin: 0; text-wrap: balance; }
.pr-head .pr-eyebrow { display: flex; flex-wrap: wrap; gap: .4rem; align-items: baseline; }
.pr-sum { margin: .7rem 0 0; color: var(--ink-2); font-size: .95rem; }
.pr-empty { padding: 2rem 0; }
.pr-empty .pr-lead { margin-bottom: 1.2rem; }

/* ---------- «Продолжить» ---------- */
.pr-go {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: .9rem 1.5rem;
  background: var(--p-paper); border: 1.5px solid var(--ink); padding: 1.2rem 1.4rem; margin: 0 0 2rem;
}
.pr-go-main { min-width: 0; }
.pr-go .pr-eyebrow { color: var(--accent-ink); margin-bottom: .3rem; }
.pr-go h2 { font: 700 1.4rem/1.2 var(--serif); margin: 0; text-wrap: balance; }
.pr-go-meta { margin: .35rem 0 0; font-size: .9rem; color: var(--ink-2); }
.pr-go-alt { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: center; gap: 0 1rem; padding-top: .5rem; border-top: 1px dashed var(--rule); font-size: .9rem; color: var(--meta); }
.pr-go-alt .pr-link { font-size: .9rem; min-height: 2.5rem; }
.pr-go > .pr-note { grid-column: 1 / -1; margin: 0; }

.pr-hello { border-left: 3px solid var(--accent); background: var(--p-paper); padding: 1rem 1.2rem 1.1rem; margin: 0 0 1.5rem; }
.pr-hello h2 { font: 700 1.15rem/1.2 var(--serif); margin: 0 0 .5rem; }
.pr-hello ul { margin: 0 0 1rem; padding-left: 1.1rem; color: var(--ink-2); display: grid; gap: .35rem; font-size: .95rem; }

/* ---------- курс: спринты и темы ---------- */
.pr-course { border-top: 2px solid var(--ink); }
.pr-sp { border-bottom: 1px solid var(--rule); }
.pr-sp > summary {
  list-style: none; cursor: pointer; display: grid; grid-template-columns: 5.2rem minmax(0, 1fr) 9rem minmax(0, 13rem); gap: .3rem 1rem;
  align-items: center; min-height: 3.6rem; padding: .6rem 0;
}
.pr-sp > summary::-webkit-details-marker { display: none; }
.pr-sp > summary:hover .pr-sp-t { color: var(--accent-ink); }
.pr-sp-n { font: 500 .72rem var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--meta); display: flex; align-items: center; gap: .45rem; }
.pr-sp-n::before { content: "+"; font: 600 1rem/1 var(--mono); color: var(--accent); width: .8rem; }
.pr-sp[open] .pr-sp-n::before { content: "−"; }
.pr-sp-t { font: 700 1.1rem/1.25 var(--serif); }
.pr-sp-p { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: .55rem; font: .74rem var(--mono); color: var(--ink-2); }
.pr-sp-c { justify-self: end; text-align: right; }
.pr-credit-chip { display: inline-flex; align-items: center; gap: .3rem; font: 500 .74rem/1.3 var(--mono); color: var(--ink-2); }
.pr-credit-chip.is-passed { color: var(--p-ok); }
.pr-credit-chip.is-honours { color: var(--p-ok); font-weight: 700; }
.pr-sp[open] > summary { border-bottom: 1px solid var(--rule); }
.pr-sp-more { margin: .2rem 0 .6rem; }
.pr-sp-more .pr-link { font-size: .875rem; }

.pr-topics { list-style: none; margin: 0; padding: 0; }
.pr-topics li + li { border-top: 1px solid color-mix(in srgb, var(--rule) 55%, transparent); }
.pr-trow {
  position: relative; display: grid; grid-template-columns: 2.6rem minmax(0, 1fr) auto 4.5rem 3.4rem; gap: .2rem .9rem; align-items: center;
  min-height: 3.1rem; padding: .55rem .5rem .6rem 0; color: var(--ink); text-decoration: none;
}
.pr-trow .pr-meter { height: 5px; }
.pr-trow.s-hard .pr-meter i { background: var(--accent); }
.pr-trow.s-text .pr-meter { visibility: hidden; }
.pr-trow:hover .pr-trow-t > span:first-child { text-decoration: underline; text-underline-offset: .18em; text-decoration-thickness: 1px; }
.pr-trow.is-cur { background: color-mix(in srgb, var(--p-doing) 35%, transparent); }
.pr-trow.s-new .pr-trow-t > span:first-child, .pr-trow.s-text .pr-trow-t > span:first-child { color: var(--ink-2); }
.pr-trow-t { min-width: 0; display: flex; flex-wrap: wrap; align-items: baseline; gap: .2rem .6rem; font-size: .98rem; line-height: 1.3; }
.pr-trow-lv { display: inline-flex; flex-wrap: wrap; gap: .2rem .3rem; min-width: 0; max-width: 100%; }
.pr-trow-n { font: .78rem var(--mono); color: var(--ink-2); text-align: right; white-space: nowrap; }
.pr-trow.s-text .pr-trow-n { color: var(--meta); }

/* зачёт спринта */
.pr-credit { border: 1.5px solid var(--ink); background: var(--p-paper); padding: 1rem 1.2rem 1.1rem; margin: 0 0 1.5rem; }
.pr-credit h2 { font: 700 1.15rem/1.2 var(--serif); margin: 0 0 .6rem; }
.pr-credit-row { display: grid; grid-template-columns: 8.5rem minmax(0, 1fr) minmax(0, 11rem); gap: .8rem; align-items: center; padding: .35rem 0; font-size: .9rem; }
.pr-credit-row > span:last-child { display: inline-flex; align-items: center; gap: .3rem; color: var(--ink-2); }
.pr-credit-row.is-ok > span:last-child { color: var(--p-ok); font-weight: 600; }
.pr-credit-row .pr-meter { height: 6px; }

/* ---------- тема: задачи строками ---------- */
.pr-ktasks { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--ink); counter-reset: none; }
.pr-ktasks li { border-bottom: 1px solid var(--rule); }
.pr-krow { display: grid; grid-template-columns: 2.4rem minmax(0, 1fr) auto minmax(0, 12rem); gap: .3rem .9rem; align-items: center; min-height: 3rem; padding: .45rem 0; color: var(--ink); text-decoration: none; }
.pr-krow:hover .pr-krow-t { text-decoration: underline; text-underline-offset: .18em; text-decoration-thickness: 1px; }
.pr-krow-i { font: 600 .95rem var(--mono); width: 2rem; height: 2rem; display: grid; place-items: center; border: 1.5px dashed var(--p-new); color: var(--meta); }
.pr-krow.k-first .pr-krow-i, .pr-krow.k-solved .pr-krow-i { background: var(--ink); border: 1.5px solid var(--ink); color: var(--bg); }
.pr-krow.k-tried .pr-krow-i { border: 1.5px solid var(--ink); background: linear-gradient(0deg, var(--p-doing) 50%, var(--p-paper) 50%); color: var(--p-doing-ink); }
.pr-krow.k-exhausted .pr-krow-i { border: 1.5px solid var(--accent); color: var(--accent-ink); background: var(--p-hard-bg); }
.pr-krow-t { font-size: .95rem; display: flex; flex-wrap: wrap; gap: .2rem .7rem; align-items: baseline; }
.pr-dw { font-size: .8rem; color: var(--meta); }
.pr-krow-s { justify-self: end; display: inline-flex; align-items: center; gap: .3rem; font-size: .82rem; color: var(--ink-2); text-align: right; }
.pr-krow.k-first .pr-krow-s, .pr-krow.k-solved .pr-krow-s { color: var(--p-ok); }
.pr-krow.k-exhausted .pr-krow-s { color: var(--accent-ink); }
.pr-mats { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .2rem 1.5rem; }

/* онбординг и раскрывашки */
.pr-onb { background: var(--p-paper); border: 1.5px solid var(--ink); padding: 1.2rem 1.3rem; margin: 0 0 1.5rem; }
.pr-onb .pr-eyebrow { color: var(--accent-ink); }
.pr-rich { max-width: 42rem; color: var(--ink-2); }
.pr-rich p { margin: 0 0 .7rem; }
.pr-rich p:last-child { margin-bottom: 0; }
.pr-rich ul, .pr-rich ol { margin: 0 0 .7rem; padding-left: 1.2rem; }
.pr-about { margin: 0 0 1.2rem; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.pr-about > summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: .5rem; min-height: 2.9rem; font-weight: 600; }
.pr-about > summary::-webkit-details-marker { display: none; }
.pr-about > summary::before { content: "+"; font-family: var(--mono); color: var(--accent); width: 1em; flex: none; }
.pr-about[open] > summary::before { content: "−"; }
.pr-about .pr-rich { padding-bottom: 1rem; }

/* ---------- задача ---------- */
.pr-tbar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin: -.6rem 0 .2rem; }
.pr-back { display: inline-flex; align-items: center; gap: .45rem; min-height: 2.75rem; min-width: 0; color: var(--ink); font-weight: 600; text-decoration: none; font-size: .95rem; }
.pr-back:hover { color: var(--accent-ink); }
.pr-back-t { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pr-pager { display: inline-flex; gap: .3rem; flex: none; }
.pr-pager a { width: 2.75rem; height: 2.75rem; display: grid; place-items: center; border: 1.5px solid var(--rule); color: var(--ink); font-size: 1.05rem; }
.pr-pager a:hover { border-color: var(--ink); }
.pr-strip { margin: 0 0 .9rem; }
.pr-strip > summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: .6rem; min-height: 2.5rem; font: 500 .78rem var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); }
.pr-strip > summary::-webkit-details-marker { display: none; }
.pr-strip > summary span { text-transform: none; letter-spacing: 0; font-family: var(--sans); font-size: .85rem; color: var(--accent-ink); text-decoration: underline; text-underline-offset: .2em; text-decoration-thickness: 1px; }
.pr-strip[open] > summary span { text-decoration: none; color: var(--meta); }
.pr-strip ol { list-style: none; margin: .3rem 0 .4rem; padding: 0; display: flex; flex-wrap: wrap; gap: .35rem; }
.pr-cell { display: grid; place-items: center; width: 2.75rem; height: 2.75rem; border: 1.5px dashed var(--p-new); font: 600 .9rem var(--mono); color: var(--meta); text-decoration: none; background: var(--p-paper); }
.pr-cell:hover { border-color: var(--ink); color: var(--ink); }
.pr-cell.k-first, .pr-cell.k-solved { background: var(--ink); border: 1.5px solid var(--ink); color: var(--bg); }
.pr-cell.k-tried { border: 1.5px solid var(--ink); color: var(--p-doing-ink); background: linear-gradient(0deg, var(--p-doing) 50%, var(--p-paper) 50%); }
.pr-cell.k-exhausted { border: 1.5px solid var(--accent); color: var(--accent-ink); background: var(--p-hard-bg); }
.pr-cell.is-cur { outline: 3px solid var(--accent-lit); outline-offset: 2px; }
.pr-modeline { margin: 0 0 .9rem; font-size: .875rem; color: var(--ink-2); }
.pr-modeline a { color: var(--accent-ink); }

.pr-sheet { background: var(--p-paper); border: 1.5px solid var(--ink); box-shadow: 6px 6px 0 var(--p-shadow); padding: 1.5rem 1.9rem 1.6rem; min-width: 0; }
.pr-tmeta { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem 1rem; margin: 0 0 .9rem; font-size: .82rem; color: var(--meta); }
.pr-statement { font: 400 1.3rem/1.6 var(--serif); margin: 0 0 1.4rem; max-width: 100%; overflow-x: auto; overflow-y: hidden; padding: 2px; }
.pr-statement p { margin: 0 0 .6rem; }
.pr-statement img { display: block; max-width: 100%; height: auto; margin: .8rem 0; }
.pr-statement table { max-width: 100%; border-collapse: collapse; font-size: .9em; }
.pr-statement td, .pr-statement th { border: 1px solid var(--rule); padding: .3rem .5rem; }
.pr-statement h2 { font: 700 1.5rem/1.2 var(--serif); margin: 0 0 1rem; }
.pr-statement h3 { font-size: 1.15rem; margin: 1rem 0 .5rem; }
.pr-statement strong, .pr-statement b { font-weight: 700; }
.pr .katex { font-size: 1.08em; }
.pr .katex-display { overflow-x: auto; overflow-y: hidden; padding: .2em 0; }
.pr-embed { position: relative; width: 100%; aspect-ratio: 4 / 5; max-height: 80vh; background: var(--bg-2); border: 1px solid var(--rule); margin: .8rem 0; }
.pr-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.pr-gap { margin: 0 !important; height: .35rem; overflow: hidden; }
.pr-blank-ghost { display: inline-block; min-width: 3.5em; border-bottom: 2px dashed var(--meta); color: transparent; }

.pr-answer fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
.pr-legend-t { padding: 0; margin: 0 0 .7rem; font-size: .85rem; color: var(--meta); }

/* действия под ответом */
.pr-act { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1.1rem; margin-top: 1.4rem; padding-top: 1.1rem; border-top: 1px dashed var(--rule); }
.pr-act .pr-btn-lg { min-width: 10rem; }
.pr-tries { font-size: .875rem; color: var(--ink-2); }
.pr-tries:empty { display: none; }
.pr-kbd { margin-left: auto; font: .72rem var(--mono); color: var(--meta); }
.pr-kbd:empty { display: none; }
@media (hover: none) { .pr-kbd { display: none; } }
.pr-skip { font-size: .9rem; color: var(--meta); }
.pr-act > .pr-note { flex-basis: 100%; margin: 0; }
.pr-result:empty { display: none; }
.pr-result { margin-top: 1rem; padding: .9rem 1rem; border: 1.5px solid var(--rule); background: var(--bg); }
.pr-result:has(.pr-verdict.is-correct) { background: var(--p-ok-bg); border-color: var(--p-ok); }
.pr-result:has(.pr-verdict.is-wrong) { background: var(--accent-bg); border-color: var(--accent); }
.pr-result:has(.pr-verdict.is-partial) { background: var(--p-part-bg); border-color: var(--p-part); }
.pr-result:has(.pr-verdict.is-check) { border-color: var(--p-part); }
.pr-opts { display: grid; grid-template-columns: minmax(0, 1fr); gap: .6rem; }
.pr-opts.is-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pr-opt {
  position: relative; display: flex; align-items: center; gap: .9rem; min-height: 4rem; padding: .8rem 1rem;
  border: 2px solid var(--rule); border-bottom-width: 4px; border-radius: 14px; background: var(--bg); cursor: pointer;
  font-size: 1.15rem; transition: border-color .12s, background-color .12s, transform .1s;
}
.pr-opt:hover { border-color: var(--meta); }
.pr-opt:active { transform: translateY(1px); }
.pr-opt input { position: absolute; opacity: 0; width: 1px; height: 1px; margin: 0; }
.pr-opt-k { flex: none; width: 1.8rem; height: 1.8rem; display: grid; place-items: center; border: 1.5px solid var(--rule); border-radius: 8px; font: 600 .8rem var(--mono); color: var(--meta); }
.pr-opt-k:empty { border-style: dashed; }
.pr-opt-text { min-width: 0; flex: 1; overflow-x: auto; overflow-y: hidden; padding: .15rem 0; }
.pr-opt-text p { margin: 0; }
.pr-opt-mark { flex: none; width: 1.25rem; height: 1.25rem; border: 1.5px solid var(--meta); border-radius: 50%; }
.pr-opt input[type="checkbox"] ~ .pr-opt-mark { border-radius: 4px; }
.pr-opt:has(input:checked) { border-color: var(--accent-lit); background: color-mix(in srgb, var(--accent-lit) 12%, var(--bg)); }
.pr-opt:has(input:checked) .pr-opt-k { background: var(--accent-lit); border-color: var(--accent-lit); color: #17161a; }
.pr-opt:has(input:checked) .pr-opt-mark { border-color: var(--accent-lit); background: var(--accent-lit); box-shadow: inset 0 0 0 3px var(--bg); }
.pr-opt:has(input:focus-visible) { outline: 3px solid var(--p-focus); outline-offset: 2px; }
.pr fieldset:disabled .pr-opt { cursor: default; transform: none; }
.pr fieldset:disabled .pr-opt:not(:has(input:checked)) { opacity: .6; }
.pr-solve.is-ok .pr-opt:has(input:checked) { border-color: var(--p-ok); background: var(--p-ok-bg); }

.pr-field { display: grid; gap: .35rem; max-width: 30rem; }
.pr-label { font-size: .85rem; color: var(--ink-2); }
.pr-input, .pr-blank {
  font: 500 1.35rem var(--mono); color: var(--ink); background: var(--bg); border: 2px solid var(--ink); border-radius: 0;
  padding: .6rem .8rem; min-height: 3.25rem; width: 100%;
}
.pr-input:focus, .pr-blank:focus { outline: 3px solid var(--p-focus); outline-offset: 1px; }
.pr-input:disabled, .pr-blank:disabled { background: var(--bg-2); color: var(--ink-2); }
.pr-input.is-math { font-size: 1.1rem; }
.pr-confirm { max-width: 16rem; font: inherit; min-height: 2.9rem; }
.pr-help { margin: .4rem 0 0; font-size: .85rem; color: var(--meta); max-width: 40rem; }
.pr-help code, .pr-preview code { font-family: var(--mono); font-size: .92em; background: var(--bg-2); padding: 0 .3em; }
.pr-blank { display: inline-block; width: 6.5em; max-width: 100%; font-size: 1.05rem; padding: .25rem .5rem; min-height: 2.6rem; margin: .2rem .3rem; vertical-align: middle; border-width: 0 0 2px; background: color-mix(in srgb, var(--p-doing) 35%, transparent); }
.pr-preview { margin-top: .8rem; padding: .7rem 1rem; background: var(--bg-2); min-height: 4.2rem; max-width: 100%; overflow-x: auto; }
.pr-preview .pr-eyebrow { margin-bottom: .3rem; }
.pr-preview-math { font-size: 1.2rem; min-height: 1.6rem; }
.pr-preview-warn { margin: .3rem 0 0; font-size: .85rem; color: var(--p-part); }
.pr-preview-empty { color: var(--meta); font-size: .85rem; }

/* соответствие: у каждой строки ряд кнопок */
.pr-match-key { list-style: none; margin: 0 0 1rem; padding: .7rem 1rem; background: var(--bg-2); display: grid; gap: .5rem; }
.pr-match-key li { display: grid; grid-template-columns: 1.6rem minmax(0, 1fr); gap: .6rem; align-items: baseline; min-width: 0; }
.pr-match-key b { font-family: var(--mono); color: var(--accent-ink); }
.pr-match-key li > span { min-width: 0; overflow-x: auto; overflow-y: hidden; }
.pr-match-rows { display: grid; gap: .6rem; }
.pr-match-row { border: 1.5px solid var(--rule); background: var(--bg); padding: .7rem 1rem; display: grid; gap: .6rem; }
.pr-match-left { display: flex; gap: .6rem; align-items: baseline; min-width: 0; overflow-x: auto; overflow-y: hidden; font-size: 1.1rem; }
.pr-match-i { font: .8rem var(--mono); color: var(--meta); flex: none; }
.pr-match-pick { display: flex; flex-wrap: wrap; gap: .4rem; }
.pr-letter { position: relative; }
.pr-letter input { position: absolute; opacity: 0; width: 1px; height: 1px; margin: 0; }
.pr-letter > span { display: grid; place-items: center; min-width: 2.9rem; min-height: 2.9rem; padding: .25rem .6rem; border: 1.5px solid var(--rule); border-radius: 10px; cursor: pointer; background: var(--p-paper); }
.pr-match-pick.is-letters .pr-letter > span { font-family: var(--mono); }
.pr-letter > span:hover { border-color: var(--ink); }
.pr-letter input:checked + span { background: var(--accent-lit); border-color: var(--accent-lit); color: #17161a; }
.pr-letter input:focus-visible + span { outline: 3px solid var(--p-focus); outline-offset: 2px; }
.pr-letter.is-used input:not(:checked) + span { opacity: .55; }
.pr-match-chosen { font-size: .85rem; color: var(--ink-2); overflow-x: auto; overflow-y: hidden; }
.pr-match-chosen:empty { display: none; }
.pr fieldset:disabled .pr-letter > span { cursor: default; }

.pr-verdict { display: flex; gap: .8rem; align-items: flex-start; padding: .2rem 0; }
.pr-verdict-ic { flex: none; width: 2.4rem; height: 2.4rem; border-radius: 50%; display: grid; place-items: center; font-size: 1.25rem; color: var(--bg); background: var(--meta); }
.pr-verdict-t b { display: block; font: 700 1.2rem/1.25 var(--sans); }
.pr-verdict-t p { margin: .15rem 0 0; color: var(--ink); font-size: .95rem; }
.pr-verdict.is-correct .pr-verdict-ic { background: var(--p-ok); }
.pr-verdict.is-correct b { color: var(--p-ok); }
.pr-verdict.is-wrong .pr-verdict-ic { background: var(--accent); }
.pr-verdict.is-wrong b { color: var(--accent-ink); }
.pr-verdict.is-partial .pr-verdict-ic { background: var(--p-part); }
.pr-verdict.is-partial b { color: var(--p-part); }
.pr-verdict.is-check { border-left: 3px solid var(--p-part); padding-left: .8rem; }
.pr-aid:empty { display: none; }
.pr-sol-link { margin-top: .1rem; padding-left: 0; font-weight: 600; }
.pr-aid { display: grid; gap: 0; margin: 1rem 0 0; }
.pr-aid .pr-about { margin: 0; max-width: none; }
.pr-aid .pr-about + .pr-about { border-top: 0; }
.pr-aid .is-solution > summary { color: var(--ink); }
.pr-aid-note { margin: 0; padding: .7rem 0; font-size: .9rem; color: var(--ink-2); border-top: 1px dashed var(--rule); border-bottom: 1px dashed var(--rule); }

/* «Спросить куратора» — под подсказками */
.pr-ask[hidden] { display: none; }
.pr-ask { margin: 1rem 0 0; }
.pr-aid:not(:empty) + .pr-ask { margin-top: 0; }
.pr-ask-note { margin: 0; padding: .7rem 0; font-size: .9rem; color: var(--ink-2); border-bottom: 1px dashed var(--rule); }
.pr-ask > :first-child { border-top: 1px dashed var(--rule); }
.pr-aid:not(:empty) + .pr-ask > :first-child { border-top: 0; }
.pr-ask-form { display: grid; gap: .45rem; padding: .9rem 0 1rem; border-bottom: 1px dashed var(--rule); max-width: 40rem; }
.pr-ask-lead { margin: 0 0 .3rem; font-size: .9rem; color: var(--ink-2); }
.pr-ask-warn, .pr-ask-err { margin: 0; font-size: .85rem; color: var(--accent-ink); }
.pr-ask-text { font: 1rem/1.45 var(--sans); color: var(--ink); background: var(--bg); border: 1.5px solid var(--ink); border-radius: 0; padding: .55rem .7rem; width: 100%; resize: vertical; }
.pr-ask-text:focus { outline: 3px solid var(--p-focus); outline-offset: 1px; }
.pr-ask-form .pr-row { margin-top: .3rem; }
.pr-hint { margin-top: .6rem; padding-top: .6rem; border-top: 1px dashed var(--rule); }
.pr-hint .pr-eyebrow { margin-bottom: .2rem; }
@media (prefers-reduced-motion: no-preference) {
  .pr-verdict { animation: pr-rise .22s ease-out; }
  @keyframes pr-rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
}

/* ---------- профиль ---------- */
.pr-kpis dd { font: 700 2.6rem/1 var(--serif); margin: 0 0 .35rem; }
.pr-kpis dt { font-size: .85rem; color: var(--ink-2); }
.pr-sec h2 { font: 700 1.45rem/1.2 var(--serif); margin: 0 0 .3rem; }
.pr-div { display: grid; gap: .1rem; margin-bottom: .8rem; }
.pr-drow { display: grid; grid-template-columns: 2.2rem minmax(0, 12rem) 1fr 2.8rem; gap: .7rem; align-items: center; font-size: .88rem; color: var(--ink); text-decoration: none; padding: .3rem 0; }
.pr-drow:hover .t { text-decoration: underline; }
.pr-drow .t { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pr-drow b { font: 600 .82rem var(--mono); text-align: right; }
.pr-dbar { position: relative; height: 14px; background: linear-gradient(90deg, transparent calc(50% - 1px), var(--ink) calc(50% - 1px), var(--ink) calc(50% + 1px), transparent 0); }
.pr-dbar i { position: absolute; top: 2px; bottom: 2px; }
.pr-dbar i.up { background: var(--p-ok); }
.pr-dbar i.down { background: var(--accent); }
.pr-heat { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 6px; }
.pr-heat-days { display: grid; grid-template-rows: repeat(7, 1fr); gap: 3px; font: .62rem var(--mono); color: var(--meta); }
.pr-heat-days span { display: flex; align-items: center; }
.pr-heat-grid { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); gap: 3px; }
.pr-heat-w { display: grid; grid-template-rows: repeat(7, 1fr); gap: 3px; }
.pr-heat i, .pr-heat-key i { display: block; aspect-ratio: 1; border-radius: 3px; }
.pr-heat .none { background: transparent; }
.l0 { background: var(--p-track); }
.l1 { background: var(--p-heat-1); }
.l2 { background: var(--p-heat-2); }
.l3 { background: var(--p-heat-3); }
.l4 { background: var(--p-heat-4); }
.pr-heat-key { display: flex; align-items: center; gap: 4px; justify-content: flex-end; font: .7rem var(--mono); color: var(--meta); margin: .7rem 0 0; }
.pr-heat-key i { width: 12px; }
.pr-account .pr-row { margin-top: .6rem; }
.pr-danger { border-top: 1px solid var(--rule); margin-top: 1.2rem; padding-top: 1rem; max-width: 40rem; }
.pr-danger h3 { font-size: 1.05rem; margin: 0 0 .3rem; }
.pr-danger p { color: var(--ink-2); font-size: .875rem; margin: 0; }

.pr-wait { display: grid; gap: .7rem; max-width: 34rem; }
.pr-wait p { margin: 0; }
.pr-wait-line { display: flex; align-items: center; gap: .6rem; color: var(--ink-2); font-size: .9rem; }
.pr-spin { width: 1rem; height: 1rem; border: 2px solid var(--p-track); border-top-color: var(--accent); border-radius: 50%; animation: pr-spin 1s linear infinite; flex: none; }
@keyframes pr-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .pr-spin { animation-duration: 3s; } }

/* ---------- статистика (админ) ---------- */
.pr-adm-filters { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1.2rem; margin: 0 0 1.2rem; }
.pr-adm-filters .pr-chip { text-decoration: none; display: inline-flex; align-items: center; gap: .35rem; }
.pr-adm-filters .pr-chip small { color: inherit; opacity: .7; font-size: .75rem; }
.pr-adm-check { display: inline-flex; align-items: center; gap: .45rem; font-size: .9rem; color: var(--ink-2); min-height: 2.75rem; cursor: pointer; }
.pr-adm-check input { width: 1.1rem; height: 1.1rem; accent-color: var(--accent); }
.pr-adm-select { width: auto; max-width: 100%; font: 400 .9rem var(--sans); padding: .55rem .7rem; min-height: 2.75rem; }
.pr-kpis dd small { font-size: 1.2rem; color: var(--meta); }
.pr-adm-scroll { overflow-x: auto; margin: 0 -.25rem; padding: 0 .25rem; }
.pr-adm-t { width: 100%; border-collapse: collapse; font-size: .875rem; font-variant-numeric: tabular-nums; }
.pr-adm-t th { font: 500 .7rem/1.2 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--meta); text-align: left; padding: .5rem .55rem; border-bottom: 1.5px solid var(--ink); white-space: nowrap; }
.pr-adm-t td { padding: .45rem .55rem; border-bottom: 1px solid var(--rule); vertical-align: top; white-space: nowrap; }
.pr-adm-t td.t { white-space: normal; min-width: 11rem; }
.pr-adm-t .n { text-align: right; }
.pr-adm-t td small { display: block; font-size: .72rem; color: var(--meta); }
.pr-adm-t a { color: var(--ink); }
.pr-adm-t .is-none, .pr-adm-per .is-none { color: var(--meta); }
.pr-adm-per span + span { margin-left: .5rem; }
.pr-adm-cal { display: inline-block; font: 500 .72rem/1.3 var(--mono); letter-spacing: .03em; padding: .15rem .45rem; border-radius: 999px; background: var(--bg-2); color: var(--ink-2); }
.pr-adm-cal.is-easy { background: var(--p-doing); color: var(--p-doing-ink); }
.pr-adm-cal.is-hard { background: var(--p-hard-bg); color: var(--accent-ink); }
.pr-adm-cal.is-ok { background: var(--p-ok-bg); color: var(--p-ok); }
.pr-adm-barh { width: 30%; min-width: 6rem; }
.pr-adm-bar { display: block; height: .55rem; margin-top: .35rem; background: var(--p-heat-3); min-width: 1px; }
.pr-solve.is-ok .pr-opt:has(input:checked) .pr-opt-k { background: var(--p-ok); border-color: var(--p-ok); color: var(--bg); }
.pr-solve.is-ok .pr-opt:has(input:checked) .pr-opt-mark { background: var(--p-ok); border-color: var(--p-ok); }

/* ---------- теория: карточки как в Anki ---------- */
.pr-cards-sum { margin: 0 0 .5rem; color: var(--ink-2); }
.pr-flash { margin-top: 1rem; }
.pr-flash-meta { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin: 0 0 1rem; }
.pr-flash-meta .pr-eyebrow { margin: 0; }
.pr-flash-meta .pr-code { color: var(--meta); }
.pr-flash-q, .pr-flash-a .pr-rich { font-size: 1.08rem; line-height: 1.55; overflow-wrap: anywhere; }
.pr-flash-q { color: var(--ink); }
.pr-flash-q .katex-display, .pr-flash-a .katex-display { overflow-x: auto; overflow-y: hidden; }
.pr-flash .katex { white-space: normal; }
.pr-flash-a hr { border: 0; border-top: 1.5px dashed var(--rule); margin: 1.2rem 0; }
.pr-flash-act { margin-top: 1.4rem; }
.pr-flash-act .pr-kbd { margin-left: .35rem; }
.pr-flash-done { font: 700 1.6rem/1.2 var(--serif); margin: 0; }
.pr-flash .pr-fine { margin-top: .8rem; }
.pr-grades { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .5rem; }
.pr-grade {
  display: grid; justify-items: center; gap: .15rem; min-height: 3.6rem; padding: .55rem .4rem; position: relative;
  border: 1.5px solid var(--ink); background: var(--p-paper); color: var(--ink); font: 500 .8rem/1.2 var(--sans); cursor: pointer;
}
.pr-grade b { font-size: .98rem; font-weight: 600; }
.pr-grade span { color: var(--ink-2); }
.pr-grade .pr-kbd { position: absolute; top: .3rem; right: .4rem; margin: 0; font-size: .65rem; color: var(--meta); }
.pr-grade:hover { background: var(--ink); color: var(--bg); }
.pr-grade:hover span { color: inherit; }
.pr-grade:focus-visible { outline: 2px solid var(--p-focus); outline-offset: 2px; }
.pr-grade:disabled { opacity: .55; cursor: default; }
.pr-grade.g-again { border-color: var(--accent); }
.pr-grade.g-again b { color: var(--accent-ink); }
.pr-grade.g-hard b { color: var(--p-part); }
.pr-grade.g-good b { color: var(--p-ok); }
.pr-grade:hover b { color: inherit; }
@media (max-width: 34rem) {
  .pr-grades { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pr-flash { padding: 1.2rem 1rem 1.3rem; }
}

.pr-cardlist { margin: 0; padding-left: 1.6rem; display: grid; gap: .35rem; }
.pr-cardlist details { border-bottom: 1px solid var(--rule); padding: .35rem 0 .45rem; }
.pr-cardlist summary { cursor: pointer; line-height: 1.5; overflow-wrap: anywhere; }
.pr-cardlist summary:focus-visible { outline: 2px solid var(--p-focus); outline-offset: 2px; }
.pr-cardlist-a { margin: .5rem 0 .3rem; padding: .6rem .8rem; background: var(--p-paper); border-left: 3px solid var(--accent); line-height: 1.55; overflow-wrap: anywhere; overflow-x: auto; }

/* профиль: числа строкой, разделы — линиями */
.pr-kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--rule); margin: 0 0 .5rem; }
.pr-kpis > div { padding: .9rem 1rem .9rem 0; display: flex; flex-direction: column-reverse; justify-content: flex-end; }
.pr-kpis > div + div { padding-left: 1rem; border-left: 1px solid var(--rule); }
.pr-kpis dd small { font-size: 1rem; color: var(--meta); font-weight: 400; }
.pr-sec { margin-top: 1rem; }
.pr-sec .pr-h2 { margin-top: 2rem; }
.pr-heat { max-width: 34rem; }
.pr-heat-key { max-width: 34rem; }

/* ---------- мини-карта спринта и клетки темы ---------- */
.pr-sp > summary { grid-template-columns: 5.2rem minmax(0, 1fr) auto minmax(0, 12rem); }
.pr-sp-p { display: flex; align-items: center; gap: .7rem; }
.pr-map { display: inline-flex; flex-wrap: wrap; gap: 4px; }
.pr-map i {
  width: 15px; height: 15px; display: block; border: 1.5px solid var(--ink);
  background: linear-gradient(0deg, var(--ink) var(--f), transparent var(--f));
}
.pr-map i.s-new { border: 1.5px dashed var(--p-new); background: transparent; }
.pr-map i.s-hard { border-color: var(--accent); background: linear-gradient(0deg, var(--accent) var(--f), var(--p-hard-bg) var(--f)); }
.pr-map i.is-cur { outline: 2px solid var(--accent-lit); outline-offset: 2px; }

.pr-fill { display: flex; flex-wrap: wrap; gap: 4px; margin-top: .7rem; }
.pr-fill i { width: 14px; height: 14px; display: block; border: 1.5px dashed var(--p-new); }
.pr-fill i.k-first, .pr-fill i.k-solved { border: 1.5px solid var(--p-ok); background: var(--p-ok); }
.pr-fill i.k-tried { border: 1.5px solid var(--ink); background: linear-gradient(0deg, var(--p-doing) 50%, transparent 50%); }
.pr-fill i.k-exhausted { border: 1.5px solid var(--accent); background: var(--p-hard-bg); }
.pr-fill.is-big { gap: 6px; margin: 1.1rem 0 .2rem; }
.pr-fill.is-big i { width: 26px; height: 26px; }
.pr-fill.is-big i.k-first, .pr-fill.is-big i.k-solved { border-color: var(--ink); background: var(--ink); }
@media (prefers-reduced-motion: no-preference) {
  /* только что решённая задача заливается снизу вверх */
  .pr-fill i.is-just { animation: pr-fillup .7s ease-out .15s both; }
  /* на итоге темы решённые клетки заливаются по очереди */
  .pr-fill.is-play i.k-first, .pr-fill.is-play i.k-solved { animation: pr-fillup .45s ease-out both; animation-delay: calc(var(--i) * 70ms + .2s); }
  @keyframes pr-fillup { from { background-size: 100% 0%; } to { background-size: 100% 100%; } }
  .pr-fill i { background-repeat: no-repeat; background-position: bottom; }
  .pr-fill i.k-first, .pr-fill i.k-solved { background-image: linear-gradient(currentColor, currentColor); background-color: transparent; }
  .pr-fill i.k-first, .pr-fill i.k-solved { color: var(--p-ok); }
  .pr-fill.is-big i.k-first, .pr-fill.is-big i.k-solved { color: var(--ink); }
  .pr-win h2 { animation: pr-rise .35s ease-out both; }
}

/* итог темы и зачёт */
.pr-win { border: 2px solid var(--ink); background: var(--p-paper); box-shadow: 6px 6px 0 var(--p-shadow); padding: 1.4rem 1.6rem 1.5rem; margin: 0 0 2rem; }
.pr-win .pr-eyebrow { color: var(--accent-ink); margin-bottom: .3rem; }
.pr-win h2 { font: 700 clamp(1.8rem, 1.3rem + 1.6vw, 2.5rem)/1.08 var(--serif); letter-spacing: -0.02em; margin: 0; }
.pr-win.is-credit, .pr-win.is-honours { border-color: var(--p-ok); box-shadow: 6px 6px 0 var(--p-ok); }
.pr-win.is-credit h2, .pr-win.is-honours h2 { color: var(--p-ok); }
.pr-win-n { margin: .7rem 0 0; color: var(--ink-2); }
.pr-win-c { margin: .4rem 0 0; font-weight: 600; }
.pr-win .pr-row { margin-top: 1.3rem; }

/* ---------- лендинг ---------- */
.pr-land { padding: 3rem 0 4rem; }
.pr-land h1 { max-width: 22ch; }
.pr-login { margin-top: 1.8rem; }
.pr-access { font-size: .9rem; color: var(--ink-2); margin: 1.6rem 0 0; max-width: 40rem; border-left: 2px solid var(--rule); padding-left: .9rem; }
.pr-access a { color: var(--accent-ink); }
.pr-land .pr-access .pr-link { font-size: inherit; min-height: 0; padding: 0; }
.pr-stp-nudge { border: 1.5px solid var(--ink); background: var(--p-paper); padding: 1rem 1.2rem; margin: 1.4rem 0 0; }
.pr-stp-nudge p { margin: 0; max-width: 44rem; }
.pr-stp-nudge .pr-row { margin-top: .8rem; flex-wrap: wrap; gap: .4rem 1rem; align-items: center; }
@media (max-width: 760px) { .pr-stp-nudge { padding: .9rem 1rem; } }
.pr-land-list { list-style: none; margin: 2.4rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 2rem; border-top: 2px solid var(--ink); }
.pr-land-list li { display: grid; gap: .25rem; padding: .9rem 0; border-bottom: 1px solid var(--rule); }
.pr-land-list b { font: 700 1.05rem/1.2 var(--serif); }
.pr-land-list span { font-size: .9rem; color: var(--ink-2); line-height: 1.45; }

/* ---------- теория: колоды строками ---------- */
.pr-decks { list-style: none; padding: 0; margin: 0; border-top: 2px solid var(--ink); }
.pr-decks li { border-bottom: 1px solid var(--rule); }
.pr-deck { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto 4.5rem 3.4rem; gap: .9rem; align-items: center; min-height: 3.1rem; padding: .55rem 0; color: var(--ink); text-decoration: none; }
.pr-deck:hover .pr-deck-t { text-decoration: underline; text-underline-offset: .18em; text-decoration-thickness: 1px; }
.pr-deck-t { font-size: .98rem; }
.pr-deck-d { font-size: .82rem; font-weight: 600; color: var(--accent-ink); white-space: nowrap; }
.pr-deck-n { font: .78rem var(--mono); color: var(--ink-2); text-align: right; white-space: nowrap; }
.pr-deck .pr-meter { height: 5px; }
.pr-cardall { margin-top: 2rem; }
.pr-cardall .pr-cardlist { margin-bottom: 1rem; }

/* ---------- телефон ---------- */
@media (max-width: 760px) {
  .pr-col, .pr-bar { padding-left: max(1rem, env(safe-area-inset-left, 0px)); padding-right: max(1rem, env(safe-area-inset-right, 0px)); }
  .pr-page { padding: 1.1rem 0 3rem; }
  .pr-nav .pr-bar { padding-left: max(.25rem, env(safe-area-inset-left, 0px)); }
  .pr-nav-tabs { overflow-x: auto; scrollbar-width: none; }
  .pr-nav-tabs a { padding: 0 .85rem; }
  .pr-head { margin-bottom: 1.2rem; }
  .pr-head h1, .pr-empty h1 { font-size: 1.9rem; }

  .pr-go { grid-template-columns: minmax(0, 1fr); padding: 1rem; }
  .pr-go .pr-btn { width: 100%; }
  .pr-go h2 { font-size: 1.25rem; }

  .pr-sp > summary { grid-template-columns: minmax(0, 1fr) auto; gap: .35rem .8rem; padding: .7rem 0; }
  .pr-sp-n { grid-column: 1; grid-row: 1; }
  .pr-sp-t { grid-column: 1 / -1; grid-row: 2; }
  .pr-sp-p { grid-column: 1 / -1; grid-row: 3; }
  .pr-sp-c { grid-column: 2; grid-row: 1; }
  .pr-trow { grid-template-columns: 2.3rem minmax(0, 1fr) 3.4rem; }
  .pr-trow .pr-meter { display: none; }
  .pr-trow-s { grid-column: 2; grid-row: 2; }
  .pr-trow-s:empty { display: none; }
  .pr-trow-n { grid-column: 3; grid-row: 1; }

  .pr-credit-row { grid-template-columns: minmax(0, 1fr) auto; }
  .pr-credit-row .pr-meter { grid-column: 1 / -1; grid-row: 2; }

  .pr-krow { grid-template-columns: 2.4rem minmax(0, 1fr) auto; }
  .pr-krow-s { grid-column: 2 / -1; grid-row: 2; justify-self: start; }
  .pr-krow-s:empty { display: none; }

  .pr-tbar { margin-top: -.4rem; }
  .pr-sheet { padding: 1.1rem 1rem 1.2rem; box-shadow: 4px 4px 0 var(--p-shadow); margin: 0 -.25rem; }
  .pr-statement { font-size: 1.12rem; }
  .pr-opts.is-grid { grid-template-columns: minmax(0, 1fr); }
  .pr-opt { min-height: 3.6rem; font-size: 1.08rem; padding: .7rem .8rem; gap: .7rem; }
  .pr-act { gap: .5rem .9rem; }
  .pr-act .pr-btn-lg { flex: 1 1 100%; min-width: 0; }
  .pr-act .pr-tries { flex: 1; }
  .pr-result { padding: .8rem; }
  .pr-verdict-ic { width: 2rem; height: 2rem; font-size: 1.05rem; }
  .pr-verdict-t b { font-size: 1.08rem; }

  .pr-kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pr-kpis > div:nth-child(3) { border-left: 0; padding-left: 0; }
  .pr-kpis > div:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .pr-kpis dd { font-size: 2rem; }
  .pr-drow { grid-template-columns: 2.2rem minmax(0, 1fr) 2.8rem; }
  .pr-drow .pr-dbar { grid-column: 1 / -1; grid-row: 2; }

  .pr-land { padding: 2rem 0 3rem; }
  .pr-win { padding: 1.1rem 1rem 1.2rem; box-shadow: 4px 4px 0 var(--p-shadow); }
  .pr-win .pr-btn { width: 100%; }
  .pr-fill.is-big i { width: 22px; height: 22px; }
  .pr-land-list { grid-template-columns: minmax(0, 1fr); }
  .pr-deck { grid-template-columns: minmax(0, 1fr) 3.4rem; }
  .pr-deck .pr-meter { display: none; }
  .pr-deck-d { grid-column: 1; grid-row: 2; }
  .pr-deck-d:empty { display: none; }
  .pr-adm-t td.t { min-width: 8rem; }
}

/* админка: таблицы в рамках, фильтры-чипы */
.pr-box { background: var(--p-paper); border: 1.5px solid var(--ink); padding: 1.3rem 1.4rem; min-width: 0; margin-top: 1.5rem; }
.pr-box h2 { font: 700 1.35rem/1.2 var(--serif); margin: 0 0 .4rem; }
.pr-chips { display: flex; flex-wrap: wrap; gap: .4rem; }
.pr-chip { font: 500 .85rem var(--sans); color: var(--ink-2); background: transparent; border: 1.5px solid var(--rule); border-radius: 999px; padding: .4rem .85rem; min-height: 2.75rem; cursor: pointer; }
.pr-chip:hover { border-color: var(--ink); color: var(--ink); }
.pr-chip.is-on { background: var(--p-doing); border-color: var(--p-doing); color: var(--p-doing-ink); }
@media (max-width: 760px) { .pr-box { padding: 1.1rem 1rem; } }

/* Четыре вкладки (у админа пять) помещаются на узком телефоне без прокрутки. */
@media (max-width: 400px) {
  .pr-nav-tabs a { padding: 0 .55rem; font-size: .9rem; }
}

/* ---------- атлас на главной («Атлас 2.0», 02.11.2026) ---------- */
/* Общая ось: полоса задачника и колонка — 60rem; текст и формы на остальных страницах — не шире 50rem, по левому краю. */
.pr-col, .pr-bar { max-width: calc(60rem + 2.5rem); }
.pr-page:not(.is-atlas):not(.is-wide) .pr-col > * { max-width: var(--p-col); }
body[data-page="practice"] { --p-done: #17161a; --p-done-ink: #fbf9f5; --p-here: #a7462a; --p-here-ink: #fff; --p-hatch: rgba(167, 70, 42, .22); }
@media (prefers-color-scheme: dark) {
  body[data-page="practice"] { --p-done: #e9e1d2; --p-done-ink: #1d1b18; --p-here: #e8875c; --p-here-ink: #1d1b18; --p-hatch: rgba(232, 135, 92, .22); }
}

.pr-head-atlas { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: .6rem 2rem; }
.pr-head-atlas .pr-sum { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem .8rem; margin: 0 0 .3rem; }
.pr-head-atlas .pr-sum b { color: var(--ink); }
.pr-wk { display: inline-flex; gap: 3px; }
.pr-wk i { width: 10px; height: 10px; border: 1px solid var(--rule); display: block; }
.pr-wk i.on { background: var(--ink); border-color: var(--ink); }
.pr-wk i.today { outline: 1.5px solid var(--accent); outline-offset: 1px; }

.pr-fill.is-dots { margin: 0; gap: 4px; }
.pr-fill.is-dots i { width: 12px; height: 12px; border: 1.5px solid var(--ink); }
.pr-fill.is-dots i.k-first, .pr-fill.is-dots i.k-solved { background: var(--ink); color: var(--ink); }
.pr-fill.is-dots i.k-new { border-style: solid; border-color: var(--ink-2); }
.pr-fill i.is-cur { outline: 2px solid var(--accent); outline-offset: 1px; }
.pr-go-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .35rem .8rem; }

.pr-atlas-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem 1.5rem; margin: 0 0 .75rem; }
.pr-atlas-head h2 { font: 700 1.35rem/1.2 var(--serif); margin: 0; }

.pr-band { display: grid; grid-template-columns: 12.5rem minmax(0, 1fr); gap: 1rem 1.5rem; padding: 1.4rem 0 1.5rem; border-top: 1px solid var(--rule); }
.pr-atlas > .pr-band:first-of-type, .pr-atlas-head + .pr-band { border-top: 2px solid var(--ink); }
.pr-band-k { margin: 0; font: 500 .72rem/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--meta); }
.pr-band-k b { color: var(--accent-ink); font-weight: 500; }
.pr-band-t { font: 700 1.12rem/1.25 var(--serif); margin: .3rem 0 .55rem; text-wrap: balance; }
.pr-band-t a { color: var(--ink); text-decoration: none; }
.pr-band-t a:hover { text-decoration: underline; text-underline-offset: .18em; text-decoration-thickness: 1px; }
.pr-band-p { display: flex; align-items: center; gap: .55rem; margin: 0; font: 500 .78rem/1 var(--mono); color: var(--meta); }
.pr-band-p .pr-meter { flex: 1; max-width: 7rem; }
.pr-band-c { display: flex; flex-wrap: wrap; gap: .2rem .9rem; margin: .7rem 0 0; font: 500 .76rem/1.2 var(--mono); color: var(--ink-2); }
.pr-band-v { margin: .3rem 0 0; font-size: .8rem; color: var(--meta); display: flex; align-items: center; gap: .3rem; flex-wrap: wrap; }
.pr-band-v.is-ok { color: var(--p-ok); font-weight: 600; }
.pr-band-v span { font-weight: 400; color: var(--meta); }

.pr-tiles { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(9.75rem, 1fr)); gap: .6rem; align-content: start; }
.pr-tiles > li { display: flex; min-width: 0; }
.pr-tile {
  --p: 0%; --fill: var(--p-doing); position: relative; flex: 1; min-width: 0; display: flex; flex-direction: column; justify-content: space-between; gap: .4rem;
  min-height: 6.4rem; padding: .6rem .7rem .55rem; color: var(--ink); text-decoration: none;
  background: linear-gradient(to top, var(--fill) var(--p), var(--p-paper) var(--p)); border: 1.5px solid var(--ink-2);
  transition: transform .14s ease, box-shadow .14s ease, border-color .14s;
}
.pr-tile-top { display: flex; justify-content: space-between; align-items: center; gap: .4rem; min-height: 1rem; }
.pr-tile-t { font: 500 .92rem/1.25 var(--sans); overflow-wrap: normal; hyphens: manual; text-wrap: balance; }
.pr-tile-n { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: .25rem .4rem; font: 500 .74rem/1 var(--mono); color: var(--ink-2); }
.pr-tile-lv { display: inline-flex; flex-wrap: wrap; justify-content: flex-end; gap: .2rem .5rem; margin-left: auto; }
.pr-tile-f { display: inline-flex; align-items: center; gap: .25rem; font: 600 .7rem/1 var(--mono); }
.pr-tile-f.is-hard { color: var(--accent-ink); }
.pr-tile-go { opacity: 0; transform: translateX(-4px); transition: .14s; display: inline-flex; }
.pr-tile:hover, .pr-tile:focus-visible { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 0 var(--ink); border-color: var(--ink); }
.pr-tile:hover .pr-tile-go, .pr-tile:focus-visible .pr-tile-go { opacity: 1; transform: none; }
.pr-tile:active { transform: none; box-shadow: 1px 1px 0 0 var(--ink); }
.pr-tile.s-new { border-style: dashed; border-color: var(--p-new); }
.pr-tile.s-new .pr-tile-t { color: var(--ink-2); }
.pr-tile.s-doing .pr-tile-n { color: var(--p-doing-ink); }
.pr-tile.s-done { --p: 100%; --fill: var(--p-done); color: var(--p-done-ink); border-color: var(--p-done); }
.pr-tile.s-done .pr-code, .pr-tile.s-done .pr-tile-n { color: var(--p-done-ink); }
.pr-tile.s-done:hover { box-shadow: 4px 4px 0 0 var(--accent); }
.pr-tile.s-hard { border-color: var(--accent); background: linear-gradient(to top, transparent var(--p), var(--p-paper) var(--p)), repeating-linear-gradient(-45deg, var(--p-hatch) 0 3px, var(--p-hard-bg) 3px 8px); }
.pr-tile.s-text { border-style: dotted; border-color: var(--p-new); color: var(--ink-2); }
.pr-tile.is-here { border: 2.5px solid var(--p-here); }
.pr-tile.is-here::before { content: "вы здесь"; position: absolute; top: -.62rem; left: .55rem; padding: .12rem .4rem; background: var(--p-here); color: var(--p-here-ink); font: 600 .66rem/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }

/* свёрнутый спринт: строка с мини-картой, раскрывается в те же плитки */
.pr-band.is-folded { display: block; padding: 0; }
.pr-band.is-folded > summary {
  list-style: none; cursor: pointer; display: grid; grid-template-columns: 5.2rem minmax(0, 1fr) auto minmax(0, 12rem); gap: .3rem 1rem;
  align-items: center; min-height: 3.6rem; padding: .6rem 0;
}
.pr-band.is-folded > summary::-webkit-details-marker { display: none; }
.pr-band.is-folded > summary:hover .pr-sp-t { color: var(--accent-ink); }
.pr-band.is-folded[open] .pr-sp-n::before { content: "−"; }
.pr-band-in { display: grid; grid-template-columns: 12.5rem minmax(0, 1fr); gap: 1rem 1.5rem; padding: .4rem 0 1.5rem; }
@media (prefers-reduced-motion: reduce) { .pr-tile, .pr-tile-go { transition: none; } }

@media (max-width: 760px) {
  .pr-head-atlas .pr-sum { font-size: .9rem; }
  .pr-band, .pr-band-in { grid-template-columns: minmax(0, 1fr); gap: .8rem; padding: 1.15rem 0 1.25rem; }
  .pr-band.is-folded { padding: 0; }
  .pr-band-in { padding-top: .2rem; }
  .pr-band-h { display: grid; grid-template-columns: minmax(0, 1fr) auto; column-gap: .75rem; }
  .pr-band-k, .pr-band-t { grid-column: 1; }
  .pr-band-p { grid-column: 2; grid-row: 1 / span 2; align-self: start; flex-direction: column; align-items: flex-end; gap: .4rem; }
  .pr-band-p .pr-meter { width: 4.5rem; flex: none; }
  .pr-band-c, .pr-band-v { grid-column: 1 / -1; }
  .pr-tiles { grid-template-columns: 1fr 1fr; gap: .5rem; }
  .pr-tile { min-height: 5.6rem; padding: .55rem .6rem .5rem; }
  .pr-tile-t { font-size: .86rem; }
  .pr-tile-go { opacity: .55; transform: none; }
  .pr-band.is-folded > summary { grid-template-columns: minmax(0, 1fr) auto; gap: .35rem .8rem; padding: .7rem 0; }
  .pr-band.is-folded .pr-sp-n { grid-column: 1; grid-row: 1; }
  .pr-band.is-folded .pr-sp-t { grid-column: 1 / -1; grid-row: 2; }
  .pr-band.is-folded .pr-sp-p { grid-column: 1 / -1; grid-row: 3; }
  .pr-band.is-folded .pr-sp-c { grid-column: 2; grid-row: 1; }
}

/* вкладки: на компьютере — с пояснением, на телефоне — коротко */
.pr-tab-x { color: inherit; opacity: .7; }
@media (max-width: 760px) { .pr-tab-x { display: none; } }


/* графа «Тренажёр» под школьной математикой */
.pr-drill > summary .pr-sp-n { color: var(--accent-ink); }
.pr-band-why { margin: .6rem 0 0; font-size: .86rem; line-height: 1.5; color: var(--ink-2); }
.pr-drill .pr-tile { min-height: 5.4rem; }

/* вступления тем школьного спринта приходят с подзаголовками — не крупнее заголовка блока */
.pr-rich h2, .pr-rich h3 { font: 700 1.02rem/1.3 var(--sans); color: var(--ink); margin: 1rem 0 .4rem; }
.pr-code { white-space: nowrap; }

/* перенос со Stepik в профиле */
.pr-stp-form { max-width: 40rem; }
.pr-stp-form .pr-row { margin-top: .4rem; flex-wrap: nowrap; }
.pr-stp-in { font: 400 1rem var(--sans); min-height: 2.9rem; flex: 1; min-width: 0; }
.pr-stp-who { display: flex; align-items: center; gap: .4rem; margin: 0 0 .4rem; font-weight: 600; color: var(--p-ok); }
.pr-stp-who a { color: var(--ink); }
@media (max-width: 760px) { .pr-stp-form .pr-row { flex-wrap: wrap; } .pr-stp-form .pr-btn { width: 100%; } }

/* ---------- карточки на телефоне и в Anki ---------- */
.pr-howto { margin-bottom: 1.6rem; max-width: 44rem; }
.pr-howto h3 { font: 700 1.05rem/1.3 var(--serif); margin: 1.3rem 0 .4rem; }
.pr-howto ol, .pr-apkg { margin: 0; padding-left: 1.4rem; display: grid; gap: .35rem; line-height: 1.5; }
.pr-howto p { line-height: 1.55; }
.pr-apkg .pr-fine { margin-left: .3rem; }
.pr-ios-share { vertical-align: -.15em; color: var(--p-focus); }
.pr-warn { border-left: 3px solid var(--accent); background: var(--p-hard-bg); padding: .7rem .9rem; margin: .4rem 0 1rem; line-height: 1.5; }
.pr-howto .pr-about { margin-top: .8rem; }
.pr-howto .pr-about > div, .pr-howto .pr-about h3 { margin-left: .2rem; }

/* своя полоса задачника вместо шапки сайта (02.11.2026) */
.pr-nav { border-top: 0; }
.pr-brand { display: flex; align-items: center; gap: .9rem; margin-right: 1.4rem; }
.pr-brand-site { font: 700 1.05rem/1 var(--serif); color: var(--on-dark-2); text-decoration: none; white-space: nowrap; }
.pr-brand-site i { font-style: normal; color: var(--accent-lit); }
.pr-brand-site:hover { color: var(--on-dark); }
.pr-brand .pr-nav-logo { margin: 0; padding-left: .9rem; border-left: 1px solid #4a443b; }
.pr-atlas-lead { margin: 0; font-size: .85rem; color: var(--meta); }
.pr-foot { border-top: 1px solid var(--rule); background: var(--bg); padding: 1.2rem 0 1.6rem; font-size: .8rem; color: var(--meta); }
.pr-foot .ft-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .6rem 2rem; border: 0; padding: 0; margin: 0; }
.pr-foot .ft-service { display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; }
.pr-foot a { color: var(--ink-2); }
.pr-foot .ft-req { display: flex; flex-wrap: wrap; gap: .2rem 1rem; margin: 0; }
@media (max-width: 760px) {
  .pr-nav .pr-bar { flex-wrap: wrap; padding-left: max(1rem, env(safe-area-inset-left, 0px)); }
  .pr-brand { width: 100%; min-height: 2.6rem; margin: 0; border-bottom: 1px solid #37322b; }
  .pr-nav-logo { display: flex; }
  .pr-nav-tabs { margin-left: -.85rem; }
}

/* ---------- первый вход: попап «как устроен задачник» ---------- */
.pr-welcome {
  width: min(36rem, calc(100vw - 2rem)); max-height: calc(100vh - 2rem); padding: 0; border: 1.5px solid var(--ink);
  background: var(--p-paper); color: var(--ink); box-shadow: 8px 8px 0 var(--p-shadow); font-family: var(--sans);
}
.pr-welcome::backdrop { background: rgba(28, 26, 23, .55); }
.pr-w-in { padding: 1.5rem 1.5rem 1.3rem; }
.pr-welcome .pr-eyebrow { color: var(--accent-ink); }
.pr-welcome h2 { font: 700 1.6rem/1.15 var(--serif); margin: .2rem 0 .8rem; text-wrap: balance; }
.pr-welcome p { color: var(--ink-2); margin: 0 0 .7rem; line-height: 1.5; }
.pr-w-list { margin: 0 0 .4rem; padding-left: 1.1rem; display: grid; gap: .45rem; color: var(--ink-2); line-height: 1.45; }
.pr-w-list b { color: var(--ink); }
.pr-w-tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .45rem; margin: .2rem 0 1rem; }
.pr-w-tile { --fill: var(--p-doing); display: flex; align-items: flex-end; min-height: 4.2rem; padding: .45rem; border: 1.5px solid var(--ink-2);
  background: linear-gradient(to top, var(--fill) var(--p), var(--p-paper) var(--p)); font: 500 .72rem/1.2 var(--sans); }
.pr-w-tile.s-new { border-style: dashed; border-color: var(--p-new); color: var(--ink-2); }
.pr-w-tile.s-done { --fill: var(--p-done); color: var(--p-done-ink); border-color: var(--p-done); }
.pr-w-tile.s-hard { border-color: var(--accent); color: var(--accent-ink);
  background: linear-gradient(to top, transparent var(--p), var(--p-paper) var(--p)), repeating-linear-gradient(-45deg, var(--p-hatch) 0 3px, var(--p-hard-bg) 3px 8px); }
.pr-w-card { border: 1.5px solid var(--ink); background: var(--bg); padding: 1rem 1.1rem; margin: 0 0 1rem; display: grid; gap: .8rem; justify-items: start; }
.pr-w-card .pr-rich { color: var(--ink); max-width: none; }
.pr-w-ans { width: 100%; }
.pr-w-ans hr { border: 0; border-top: 1.5px dashed var(--rule); margin: 0 0 .8rem; }
.pr-w-fine { font-size: .85rem; border-left: 2px solid var(--rule); padding-left: .8rem; }
.pr-w-foot { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: 1.2rem; }
.pr-w-foot .pr-row { margin: 0; }
.pr-w-dots { display: flex; gap: 6px; }
.pr-w-dots i { width: .55rem; height: .55rem; border-radius: 50%; background: var(--p-track); }
.pr-w-dots i.on { background: var(--accent); }
.pr-welcome a:focus-visible, .pr-welcome button:focus-visible { outline: 3px solid var(--p-focus); outline-offset: 2px; }
.pr-welcome svg { width: 1em; height: 1em; }
@media (max-width: 520px) {
  .pr-w-in { padding: 1.2rem 1rem 1rem; }
  .pr-w-tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .pr-w-foot .pr-btn { width: 100%; }
}

/* ---------- спокойная гамма прогресса (02.11.2026, просьба владельца) ----------
   Решённое — светло-зелёным, пройденное — плотнее и с зелёной галочкой; «вы здесь» — рамка чернилами.
   «Идёт трудно» — как было: штриховка и кирпичная рамка (владелец: «нормально было сделано»). Одни и те же цвета у плиток, мини-карты, клеток задач и полосок. */
body[data-page="practice"] { --p-fill: #dcefe0; --p-fill-strong: #bfe0c7; --p-fill-ink: #1f5136; }
@media (prefers-color-scheme: dark) {
  body[data-page="practice"] { --p-fill: #1e3828; --p-fill-strong: #2a5239; --p-fill-ink: #cdeed6; }
}
.pr-meter i { background: var(--p-ok); }

.pr-tile { --fill: var(--p-fill); }
.pr-tile.s-doing { --fill: var(--p-fill); }
.pr-tile.s-doing .pr-tile-n { color: var(--p-fill-ink); }
.pr-tile.s-done { --fill: var(--p-fill-strong); color: var(--ink); border-color: var(--p-ok); }
.pr-tile.s-done .pr-code, .pr-tile.s-done .pr-tile-n { color: var(--p-fill-ink); }
.pr-tile.s-done .pr-tile-f { color: var(--p-ok); }
.pr-tile.s-done:hover { box-shadow: 4px 4px 0 0 var(--p-ok); }
.pr-tile.is-here { border: 2px solid var(--ink); }
.pr-tile.is-here::before { background: var(--ink); color: var(--bg); }

.pr-map i { border-color: var(--ink-2); background: linear-gradient(0deg, var(--p-fill-strong) var(--f), transparent var(--f)); }
.pr-map i.s-done { border-color: var(--p-ok); background: var(--p-fill-strong); }
.pr-map i.is-cur { outline-color: var(--ink); }

.pr-krow.k-first .pr-krow-i, .pr-krow.k-solved .pr-krow-i,
.pr-cell.k-first, .pr-cell.k-solved { background: var(--p-fill-strong); border: 1.5px solid var(--p-ok); color: var(--p-fill-ink); }
.pr-krow.k-tried .pr-krow-i, .pr-cell.k-tried { background: linear-gradient(0deg, var(--p-fill) 50%, var(--p-paper) 50%); border: 1.5px solid var(--ink-2); color: var(--ink); }
.pr-cell.is-cur { outline-color: var(--ink); }

.pr-fill.is-dots i.k-first, .pr-fill.is-dots i.k-solved,
.pr-fill.is-big i.k-first, .pr-fill.is-big i.k-solved { background: var(--p-fill-strong); border-color: var(--p-ok); color: var(--p-fill-strong); }
.pr-fill.is-dots i.k-tried { background: linear-gradient(0deg, var(--p-fill) 50%, transparent 50%); border-color: var(--ink-2); }
.pr-fill i.is-cur { outline-color: var(--ink); }
@media (prefers-reduced-motion: no-preference) {
  .pr-fill.is-big i.k-first, .pr-fill.is-big i.k-solved { color: var(--p-fill-strong); background-color: transparent; }
}

.pr-trow .pr-meter i { background: var(--p-ok); }
.pr-trow.is-cur { background: color-mix(in srgb, var(--p-fill) 60%, transparent); }

.pr-w-tile { --fill: var(--p-fill); }
.pr-w-tile.s-done { --fill: var(--p-fill-strong); color: var(--p-fill-ink); border-color: var(--p-ok); }
.pr-wk i.on { background: var(--p-ok); border-color: var(--p-ok); }

/* текст: без висячих слов и рваных переносов */
.pr p, .pr li, .pr-welcome p, .pr-welcome li { text-wrap: pretty; }
.pr h1, .pr h2, .pr h3, .pr-tile-t, .pr-go h2 { text-wrap: balance; }
body[data-page="practice"] { --p-heat-1: #d6ecda; --p-heat-2: #a9d6b3; --p-heat-3: #6fb383; --p-heat-4: #2d6a4f; }
@media (prefers-color-scheme: dark) {
  body[data-page="practice"] { --p-heat-1: #1f3a2a; --p-heat-2: #2a5a3c; --p-heat-3: #4a8f63; --p-heat-4: #8fcaa3; }
}

.pr-steps { list-style: decimal; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 12rem), 1fr)); gap: 1.2rem 1rem; padding-left: 1.4rem; }
.pr-steps li p { margin: 0 0 .5rem; line-height: 1.45; }
.pr-shot { display: block; width: 100%; max-width: 15rem; height: auto; border: 1px solid var(--rule); border-radius: 1.6rem; background: #fff; }
.pr-homecta { background: var(--p-paper); border: 1.5px solid var(--accent); padding: 1.1rem 1.2rem 1.2rem; margin: 0 0 1.6rem; }
.pr-homecta .pr-eyebrow { color: var(--accent-ink); margin-bottom: .3rem; }
.pr-homecta h2 { font: 700 1.3rem/1.2 var(--serif); margin: 0 0 .4rem; text-wrap: balance; }
.pr-homecta > p { margin: 0; line-height: 1.5; color: var(--ink-2); }
.pr-homecta .pr-row { margin-top: .8rem; }
.pr-homecta-howto { margin-top: 1rem; padding-top: 1rem; border-top: 1px dashed var(--rule); }
.pr-x { display: inline-flex; align-items: center; justify-content: center; width: 2.6rem; height: 2.6rem; padding: 0; border: 0; background: none; color: var(--meta); cursor: pointer; border-radius: 50%; flex: none; }
.pr-x:hover { color: var(--ink); background: var(--bg-2); }
.pr-x:focus-visible { outline: 2px solid var(--p-focus); outline-offset: 2px; }
.pr-ankirow { position: relative; padding-right: 2.8rem; }
.pr-ankirow .pr-x { position: absolute; right: 0; top: 50%; transform: translateY(-50%); }
.pr-homecta { position: relative; }
.pr-homecta-x { position: absolute; top: .35rem; right: .35rem; }
.pr-homecta h2 { padding-right: 2.2rem; }

/* ---------- знаки: полка в профиле, тост, «Поздравляем!», «Поделиться» ---------- */
.pr-badge-img { display: inline-block; width: var(--sz); height: var(--sz); flex: none; }
.pr-badge-img img { display: block; width: 100%; height: 100%; }
.pr-ach-gh { font: 500 .72rem/1.3 var(--mono); letter-spacing: .09em; text-transform: uppercase; color: var(--meta); margin: 1.6rem 0 .6rem; }
.pr-ach-gh span { color: var(--ink-2); margin-left: .4rem; }
.pr-ach-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .5rem; }
.pr-ach { display: flex; align-items: center; gap: .8rem; padding: .6rem .7rem; text-align: left; font: inherit; color: var(--ink);
  background: var(--p-paper); border: 1.5px solid var(--rule); cursor: pointer; min-width: 0; }
.pr-ach:hover { border-color: var(--ink); }
.pr-ach:focus-visible { outline: 3px solid var(--p-focus); outline-offset: 2px; }
.pr-ach.is-done { background: var(--bg-2); }
.pr-ach-t { display: grid; gap: .2rem; min-width: 0; }
.pr-ach-t b { font-weight: 600; font-size: .92rem; line-height: 1.25; }
.pr-ach.is-new .pr-ach-t b { color: var(--ink-2); }
.pr-ach-hint { font-size: .8rem; line-height: 1.35; color: var(--ink-2); }
.pr-ach-prog { display: flex; align-items: center; gap: .5rem; font: .72rem/1.2 var(--mono); color: var(--meta); flex-wrap: wrap; }
.pr-ach-bar { width: 4rem; height: 5px; background: var(--p-track); border-radius: 3px; overflow: hidden; flex: none; }
.pr-ach-bar i { display: block; height: 100%; background: var(--p-ok); border-radius: 3px; }
.pr-ach-done { display: inline-flex; align-items: center; gap: .3rem; font: .72rem/1.2 var(--mono); color: var(--p-ok); }
@media (max-width: 640px) { .pr-ach-grid { grid-template-columns: minmax(0, 1fr); } }

.pr-achd { width: min(30rem, calc(100vw - 2rem)); }
.pr-ach-dhead { display: flex; align-items: center; gap: 1rem; margin-bottom: .8rem; }
.pr-ach-dhead h2 { margin: 0; }
.pr-ach-sub { font-size: .85rem; color: var(--meta) !important; margin: .2rem 0 0 !important; }
.pr-ach-steps { list-style: none; margin: .4rem 0 .8rem; padding: 0; display: grid; gap: .4rem; }
.pr-ach-steps li { display: grid; grid-template-columns: 1.1rem 6rem minmax(0, 1fr); align-items: baseline; gap: .5rem; font-size: .88rem; color: var(--meta); }
.pr-ach-steps li.on { color: var(--ink); }
.pr-ach-steps li svg { color: var(--p-ok); align-self: center; }
.pr-ach-steps li i { width: .7rem; height: .7rem; border: 1.5px solid var(--p-new); border-radius: 50%; align-self: center; }
.pr-ach-steps li span { color: var(--ink-2); font-size: .8rem; }

.pr-toasts { position: fixed; z-index: 60; left: 50%; transform: translateX(-50%); bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
  width: min(23rem, calc(100vw - 2rem)); display: grid; gap: .5rem; pointer-events: none; }
@media (min-width: 900px) { .pr-toasts { left: auto; right: 1.5rem; top: 5rem; bottom: auto; transform: none; } }
.pr-toast { position: relative; pointer-events: auto; background: var(--p-paper); color: var(--ink); border: 1.5px solid var(--ink);
  box-shadow: 6px 6px 0 var(--p-shadow); overflow: hidden; animation: pr-toast-in .25s ease-out; transition: opacity .25s, transform .25s; }
.pr-toast.is-out { opacity: 0; transform: translateY(8px); }
.pr-toast-in { display: flex; align-items: center; gap: .8rem; padding: .7rem 2.4rem .8rem .7rem; color: inherit; text-decoration: none; }
.pr-toast-in > span:last-child { display: grid; gap: .15rem; min-width: 0; }
.pr-toast .pr-eyebrow { margin: 0; color: var(--accent-ink); }
.pr-toast b { font: 700 1.05rem/1.2 var(--serif); }
.pr-toast-txt { font-size: .82rem; color: var(--ink-2); line-height: 1.35; }
.pr-toast-x { position: absolute; top: .45rem; right: .45rem; border: 0; background: none; color: var(--meta); padding: .3rem; cursor: pointer; }
.pr-toast-timer { position: absolute; left: 0; bottom: 0; height: 3px; width: 100%; background: var(--p-ok); transform-origin: left; animation: pr-toast-timer 5s linear forwards; }
@keyframes pr-toast-in { from { opacity: 0; transform: translateY(10px); } }
@keyframes pr-toast-timer { to { transform: scaleX(0); } }

.pr-cel { width: min(26rem, calc(100vw - 2rem)); text-align: center; overflow: hidden; }
.pr-cel-art { position: relative; height: 15rem; display: grid; place-items: center; overflow: hidden; }
.pr-cel-rays { position: absolute; inset: -40%; background: repeating-conic-gradient(from 0deg, #ffe7a3 0 7deg, transparent 7deg 22.5deg);
  opacity: .55; animation: pr-rays 30s linear infinite; }
.pr-cel-art .pr-badge-img { position: relative; animation: pr-pop .5s cubic-bezier(.2, 1.4, .4, 1); }
.pr-confetti { position: absolute; inset: 0; pointer-events: none; }
.pr-confetti i { position: absolute; top: -10px; left: var(--x); width: 9px; height: 5px; transform: rotate(var(--r)); animation: pr-fall 2.4s var(--d) ease-in forwards; opacity: 0; }
.pr-cel-in { padding-top: .4rem; }
.pr-cel-in h2 { margin-top: 0; }
.pr-cel .pr-row { justify-content: center; }
.pr-cel-more { margin: .9rem 0 0 !important; font-size: .9rem; }
.pr-cel-more a { display: inline-flex; align-items: center; gap: .3rem; color: var(--ink); }
.pr-cel-sum { text-align: left; }
.pr-cel-sum .pr-row { justify-content: flex-start; }
.pr-cel-list { list-style: none; margin: .4rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(8.5rem, 1fr)); gap: .6rem;
  max-height: 40vh; overflow: auto; }
.pr-cel-list li { display: flex; align-items: center; gap: .5rem; font-size: .85rem; line-height: 1.25; }
.pr-cel-list small { display: block; color: var(--meta); font: .7rem/1.3 var(--mono); }
@keyframes pr-rays { to { transform: rotate(360deg); } }
@keyframes pr-pop { from { transform: scale(.6); opacity: 0; } }
@keyframes pr-fall { 0% { opacity: 1; transform: translateY(0) rotate(var(--r)); } 100% { opacity: 0; transform: translateY(16rem) rotate(calc(var(--r) + 300deg)); } }

.pr-share .pr-w-in > h2 { margin-bottom: .6rem; }
.pr-seg { display: inline-flex; padding: 3px; background: var(--bg-2); border: 1.5px solid var(--rule); }
.pr-seg button { border: 0; background: none; padding: .4rem .9rem; font: 500 .85rem var(--sans); color: var(--ink-2); cursor: pointer; }
.pr-seg button[aria-pressed="true"] { background: var(--p-paper); color: var(--ink); box-shadow: 0 0 0 1.5px var(--ink); }
.pr-share-prev { margin: .8rem 0; display: grid; place-items: center; min-height: 12rem; background: var(--bg-2); }
.pr-share-prev img { display: block; max-width: 100%; max-height: 22rem; }
.pr-share-name { display: flex; align-items: center; gap: .5rem; font-size: .88rem; color: var(--ink-2); cursor: pointer; }
.pr-share .pr-row .pr-btn { flex: 1 1 auto; justify-content: center; }

@media (prefers-reduced-motion: reduce) {
  .pr-cel-rays, .pr-confetti i, .pr-cel-art .pr-badge-img, .pr-toast { animation: none; }
  .pr-confetti { display: none; }
  .pr-toast-timer { animation-duration: 5s; }
}

/* ---------- доступ по уровню подписки (server/access.py): закрытое видно с замком и названием уровня ---------- */
.pr-lock { display: inline-flex; align-items: center; gap: .25rem; font: 500 .74rem/1.3 var(--mono); color: var(--meta); white-space: nowrap; }
.pr-lock svg, .pr-band-v svg, .pr-credit-chip svg, .pr-locked-more svg, .pr-note > svg, .pr-sub > svg, .pr-sum > svg { vertical-align: -.12em; margin-right: .2rem; }
.pr-trow.is-locked .pr-trow-t > span:first-child, .pr-deck.is-locked .pr-deck-t { color: var(--meta); }
.pr-trow.is-locked .pr-meter { visibility: hidden; }
.pr-trow.is-locked .pr-trow-n { color: var(--meta); display: inline-flex; align-items: center; justify-content: flex-end; gap: .25rem; }
.pr-tile.is-locked { border-style: dashed; border-color: var(--p-new); background: var(--bg); color: var(--meta); }
.pr-tile.is-locked .pr-tile-t { color: var(--ink-2); }
.pr-tile-f.is-lock { color: var(--meta); }
.pr-tile-n .pr-lock { font-size: .7rem; }
.pr-deck.is-locked .pr-deck-n { display: inline-flex; align-items: center; justify-content: flex-end; gap: .25rem; color: var(--meta); font: .78rem var(--mono); }
.pr-deck.is-locked .pr-deck-d { color: var(--meta); font-size: .8rem; }
.pr-locked { border: 1.5px dashed var(--ink-2); background: var(--p-paper); padding: 1.1rem 1.3rem 1.2rem; margin: 0 0 1.8rem; }
.pr-locked .pr-eyebrow { display: flex; align-items: center; gap: .35rem; color: var(--accent-ink); margin-bottom: .3rem; }
.pr-locked h2 { font: 700 1.3rem/1.2 var(--serif); margin: 0 0 .5rem; text-wrap: balance; }
.pr-locked > p { margin: 0 0 .4rem; color: var(--ink-2); }
.pr-locked .pr-row, .pr-plan .pr-row, .pr-credit .pr-row, .pr-win .pr-row + .pr-note { margin-top: .9rem; }
.pr-plan { border-left: 3px solid var(--p-new); padding: .2rem 0 .2rem 1rem; margin: -1rem 0 2rem; color: var(--ink-2); font-size: .95rem; }
.pr-plan > p { margin: 0 0 .3rem; }
.pr-locked-more { margin-top: .9rem; }
@media (max-width: 40rem) {
  .pr-locked { padding: 1rem; }
  .pr-locked .pr-btn, .pr-plan .pr-btn { width: 100%; }
}
.pr-band-v.is-lock { display: block; }
.pr-sp-p > span:last-child { display: inline-flex; align-items: center; gap: .2rem; }
.pr-locked .pr-fine a, .pr-plan .pr-fine a { color: var(--accent-ink); }
/* «Как открыть задачник» по шагам: на странице входа и под замками. Номер в кружке, заголовок шага, пояснение. */
.pr-open { max-width: 44rem; margin: 1.6rem 0 0; }
.pr-open-h { font: 700 1.25rem/1.25 var(--serif); margin: 0 0 .4rem; }
.pr-open-list { list-style: none; counter-reset: pr-open; margin: 0; padding: 0; border-top: 2px solid var(--ink); }
.pr-open-list > li { counter-increment: pr-open; display: grid; grid-template-columns: 2.4rem minmax(0, 1fr); column-gap: .9rem; row-gap: .2rem; padding: .85rem 0; border-bottom: 1px solid var(--rule); }
.pr-open-list > li::before { content: counter(pr-open); grid-row: span 2; display: grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%; background: var(--accent); color: var(--bg); font: 700 .9rem/1 var(--mono); }
.pr-open-list b { font: 700 1.02rem/1.3 var(--sans); color: var(--ink); align-self: center; }
.pr-open-list span { font-size: .92rem; line-height: 1.5; color: var(--ink-2); }
.pr-open-list a { color: var(--accent-ink); white-space: nowrap; }
.pr-open .pr-fine { margin-top: .6rem; }
.pr-locked .pr-open, .pr-plan .pr-open { margin-top: 1.1rem; }
.pr-open-a { display: block; margin-top: .3rem; font-style: normal; }
.pr-locked .pr-open-h, .pr-plan .pr-open-h { font-size: 1.05rem; margin-bottom: .35rem; }