/* Карточный интерфейс: каждое задание — отдельная карточка на мягком фоне. */

/* Шрифты лежат рядом с сайтом: Google Fonts из России открывается через раз. */
@font-face { font-family: "Onest"; font-weight: 400; font-display: swap; src: url("fonts/onest-cyrillic-400-normal.woff2") format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "Onest"; font-weight: 400; font-display: swap; src: url("fonts/onest-latin-400-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212, U+2215; }
@font-face { font-family: "Onest"; font-weight: 500; font-display: swap; src: url("fonts/onest-cyrillic-500-normal.woff2") format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "Onest"; font-weight: 500; font-display: swap; src: url("fonts/onest-latin-500-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212, U+2215; }
@font-face { font-family: "Onest"; font-weight: 600; font-display: swap; src: url("fonts/onest-cyrillic-600-normal.woff2") format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "Onest"; font-weight: 600; font-display: swap; src: url("fonts/onest-latin-600-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2212, U+2215; }
@font-face { font-family: "Unbounded"; font-weight: 500; font-display: swap; src: url("fonts/unbounded-cyrillic-500-normal.woff2") format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "Unbounded"; font-weight: 500; font-display: swap; src: url("fonts/unbounded-latin-500-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+2000-206F; }
@font-face { font-family: "Unbounded"; font-weight: 700; font-display: swap; src: url("fonts/unbounded-cyrillic-700-normal.woff2") format("woff2"); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: "Unbounded"; font-weight: 700; font-display: swap; src: url("fonts/unbounded-latin-700-normal.woff2") format("woff2"); unicode-range: U+0000-00FF, U+2000-206F; }
/* Символы формул — из DejaVu Sans, тем же шрифтом подписаны картинки dm_figures. */
@font-face { font-family: "DM Math"; font-display: swap; src: url("fonts/dejavu-math.woff2") format("woff2"); }

:root {
  --bg: #f4f4f7;
  --paper: #f4f4f7;
  --card: #ffffff;
  --sunken: #f7f7fa;
  --ink: #17161c;
  --muted: #676473;
  --line: #e5e3eb;
  --line-strong: #cfccd8;
  --accent: #5b3fd9;
  --accent-ink: #4a2fc2;
  --accent-soft: #efebff;
  --on-accent: #ffffff;
  --ok: #17804c;
  --ok-soft: #e4f5eb;
  --bad: #c2321f;
  --bad-soft: #fdece9;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 1px 2px rgba(22, 18, 44, 0.04), 0 6px 20px -8px rgba(22, 18, 44, 0.08);
  --shadow-lg: 0 2px 6px rgba(22, 18, 44, 0.06), 0 18px 48px -12px rgba(22, 18, 44, 0.22);
  --wide: 46rem;

  --body: "Onest", "DM Math", system-ui, sans-serif;
  --display: "Unbounded", "Onest", "DM Math", system-ui, sans-serif;

  font-family: var(--body);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  color-scheme: light;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f13;
    --paper: #0f0f13;
    --card: #18181f;
    --sunken: #131318;
    --ink: #edecf2;
    --muted: #a19eac;
    --line: #2a2933;
    --line-strong: #3b3946;
    --accent: #a795ff;
    --accent-ink: #c0b3ff;
    --accent-soft: rgba(167, 149, 255, 0.13);
    --on-accent: #120d2a;
    --ok: #6fd3a0;
    --ok-soft: rgba(111, 211, 160, 0.12);
    --bad: #ff8a80;
    --bad-soft: rgba(255, 138, 128, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 18px 48px -12px rgba(0, 0, 0, 0.7);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { scroll-padding-top: calc(5rem + env(safe-area-inset-top, 0px)); }

body { margin: 0; min-height: 100vh; background: var(--bg); }

h1, h2, p { margin: 0; }
img { max-width: 100%; height: auto; }
a { color: var(--accent-ink); text-underline-offset: 0.18em; }
a:hover { color: var(--accent); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- страница ---------- */

.sheet {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 2.75rem 1.25rem 9rem;
  padding-bottom: calc(9rem + env(safe-area-inset-bottom, 0px));
  min-height: 100vh;
}

.intro { margin-bottom: 2rem; }
h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.75rem, 5.2vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
  text-wrap: balance;
}
.lead { color: var(--muted); max-width: 36rem; font-size: 1.04rem; text-wrap: pretty; }
.lead p + p { margin-top: 0.5rem; }
.meta { display: flex; flex-wrap: wrap; gap: 0.4rem; color: var(--muted); font-size: 0.88rem; margin-top: 1rem; }
.muted { color: var(--muted); }

h2 {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 2.75rem 0 0.9rem 0.25rem;
}

/* ---------- кнопки и поля ---------- */

.btn {
  font: inherit;
  font-weight: 500;
  border-radius: 999px;
  cursor: pointer;
  border: 1px solid transparent;
  padding: 0.65rem 1.25rem;
  line-height: 1.2;
  transition: background-color 0.15s, border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: var(--on-accent); box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--accent) 60%, transparent); }
.btn.primary:hover { background: var(--accent-ink); }
.btn.primary:disabled { opacity: 0.55; cursor: default; box-shadow: none; }
.btn.quiet { background: var(--card); color: var(--ink); border-color: var(--line); padding: 0.45rem 0.95rem; font-size: 0.9rem; }
.btn.quiet:hover { border-color: var(--line-strong); background: var(--sunken); }

.field-label { display: block; font-weight: 600; font-size: 0.92rem; margin-bottom: 0.5rem; }
.field-error { display: block; color: var(--bad); font-size: 0.88rem; margin-top: 0.45rem; }

input[type="text"], input[type="password"], input[type="date"], select, textarea {
  font: inherit;
  color: var(--ink);
  background: var(--sunken);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.65rem 0.85rem;
  width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s, background-color 0.15s;
}
input[type="text"]:focus, textarea:focus, select:focus, input[type="password"]:focus, input[type="date"]:focus {
  border-color: var(--accent);
  background: var(--card);
  box-shadow: 0 0 0 4px var(--accent-soft);
  outline: none;
}
textarea { resize: vertical; }

/* ---------- начало ---------- */

.start {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  display: grid;
  gap: 1.5rem;
  margin-bottom: 1rem;
}
.started .start { display: none; }

.group-field input {
  max-width: 12rem;
  font-family: var(--display);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.group-field input::placeholder { color: var(--muted); opacity: 0.45; letter-spacing: 0.06em; }
.group-field input.invalid { border-color: var(--bad); box-shadow: 0 0 0 4px var(--bad-soft); }

.modes { border: 0; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; }
.modes legend { padding: 0; }
.mode {
  position: relative;
  display: grid;
  gap: 0.2rem;
  padding: 0.9rem 1rem 0.9rem 2.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--sunken);
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}
.mode::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 1.1rem;
  width: 1.05rem;
  height: 1.05rem;
  border-radius: 50%;
  border: 1.5px solid var(--line-strong);
  background: var(--card);
  transition: border 0.15s;
}
.mode:hover { border-color: var(--line-strong); }
.mode input { position: absolute; opacity: 0; pointer-events: none; }
.mode:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.mode:has(input:checked)::before { border: 5px solid var(--accent); }
.mode:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.mode-name { font-weight: 600; }
.mode-desc { color: var(--muted); font-size: 0.88rem; line-height: 1.4; }
.start .btn.primary { justify-self: start; padding: 0.85rem 2.2rem; font-size: 1.02rem; }

/* до начала вопросы видны, но неактивны */
body.quiz:not(.started) .questions,
body.quiz:not(.started) .feedback { opacity: 0.45; pointer-events: none; user-select: none; }

/* ---------- задание ---------- */

.q {
  position: relative;
  padding: 1.35rem 1.5rem 1.5rem;
  margin-bottom: 0.9rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.q.is-right { border-color: color-mix(in srgb, var(--ok) 45%, var(--line)); }
.q.is-wrong { border-color: color-mix(in srgb, var(--bad) 45%, var(--line)); }
.q-body { min-width: 0; }
.q-text .katex, .explanation-body .katex, .opt-body .katex { white-space: normal; }
.q-text p, .explanation-body p, .explanation-body li { overflow-x: auto; overflow-y: hidden; }

.q-num {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  height: 1.85rem;
  padding: 0 0.75rem;
  margin-bottom: 0.9rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-family: var(--display);
  font-weight: 500;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}
.is-right .q-num { background: var(--ok-soft); color: var(--ok); }
.is-wrong .q-num { background: var(--bad-soft); color: var(--bad); }
.is-right .q-num::after, .is-wrong .q-num::after { font-family: var(--body); font-size: 0.8rem; font-weight: 600; }
.is-right .q-num::after { content: "верно"; }
.is-wrong .q-num::after { content: "ошибка"; }

.q-text { font-size: 1.04rem; }
.q-text > * + * { margin-top: 0.6rem; }
.q-text p { margin: 0; }
.q-text img, .explanation img, .hint img {
  display: block;
  margin: 0.9rem 0;
  border-radius: 12px;
  cursor: zoom-in;
  max-height: 26rem;
  max-width: min(100%, 30rem);
  width: auto;
}
img.fig { background: var(--card); padding: 0.4rem; border: 1px solid var(--line); }
img.photo { background: #fff; }

@media (prefers-color-scheme: dark) {
  img.fig-png { filter: invert(0.88) hue-rotate(180deg); background: #fff; }
  #zoom img.fig-png { filter: invert(0.88) hue-rotate(180deg); }
}

/* формулы KaTeX */
.katex { font-size: 1.08em; }
.math-block { overflow-x: auto; overflow-y: hidden; padding: 0.2rem 0; }
@media (max-width: 34rem) { .math-block .katex-display > .katex { font-size: 0.95em; } }
.opt-body .katex { font-size: 1.04em; }
.q-text ol, .q-text ul, .explanation ol, .explanation ul { padding-left: 1.3rem; margin: 0.4rem 0; }
.q-text table, .explanation table { border-collapse: collapse; margin: 0.6rem 0; }
.q-text td, .q-text th, .explanation td, .explanation th { border: 1px solid var(--line); padding: 0.35rem 0.65rem; }

.note { color: var(--muted); font-size: 0.9rem; margin-top: 1rem; }

/* варианты */
.options { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0.5rem; margin-top: 1.1rem; }
.note + .options { margin-top: 0.5rem; }

.opt {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 0.85rem;
  padding: 0.75rem 0.9rem;
  background: var(--sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}
.opt input { position: absolute; opacity: 0; pointer-events: none; }
.opt:hover { border-color: var(--line-strong); background: var(--card); }
.opt:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.opt:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.opt-body { padding-top: 0.15rem; overflow-wrap: anywhere; min-width: 0; overflow-x: auto; }

.badge {
  display: grid;
  place-items: center;
  width: 1.8rem;
  height: 1.8rem;
  border: 1.5px solid var(--line-strong);
  background: var(--card);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}
.single .badge { border-radius: 50%; }
.multiple .badge { border-radius: 7px; }
.opt:has(input:checked) .badge { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

.options.pictures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pictures .opt { grid-template-columns: 1fr; justify-items: center; padding: 0.65rem; }
.pictures .badge { justify-self: start; }
.pictures .opt-body img { display: block; border-radius: 8px; }
.pictures .opt-body img.fig { padding: 0; background: transparent; border: 0; }
@media (prefers-color-scheme: dark) { .pictures .opt-body img.fig-png { background: #fff; } }

/* краткий ответ */
.answer-field { margin-top: 1.1rem; }
.format { color: var(--muted); font-size: 0.88rem; margin-bottom: 0.5rem; }
.text-input { max-width: 22rem; font-size: 1.08rem !important; }
.format-warn { color: var(--bad); font-size: 0.88rem; margin-top: 0.45rem; }

/* подсказки и кнопки у задания */
.hints { display: grid; gap: 0.5rem; margin-top: 1rem; }
.hints:not(:has(.hint:not([hidden]))) { display: none; }
.hint {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font-size: 0.96rem;
  animation: appear 0.2s ease-out;
}
.hint-label { font-weight: 600; font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent-ink); margin-bottom: 0.25rem; }

.q-tools { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1.1rem; }
.q-tools:empty, .q-tools:not(:has(button:not([hidden]))) { display: none; }
.check-btn { display: none; }
.mode-practice .check-btn { display: inline-block; }
.mode-practice .q-tools .check-btn { border-color: var(--accent); color: var(--accent-ink); }
.q.locked .q-tools { display: none; }
.q.locked .opt { cursor: default; }
.q.locked .opt:not(.key, .miss):hover { border-color: var(--line); background: var(--sunken); }
.q.locked .opt:not(.key, .miss):has(input:checked) { border-color: var(--line); background: var(--sunken); }
.q.locked input { pointer-events: none; }

/* разбор */
.review { margin-top: 1.1rem; display: grid; grid-template-columns: minmax(0, 1fr); gap: 0.7rem; animation: appear 0.25s ease-out; }
.verdict { font-weight: 600; }
.is-right .verdict { color: var(--ok); }
.is-wrong .verdict { color: var(--bad); }
.key-line strong { font-weight: 600; }

.q.locked .opt.key { border-color: var(--ok); background: var(--ok-soft); }
.q.locked .opt.key .badge { background: var(--ok); border-color: var(--ok); color: var(--card); }
.q.locked .opt.miss { border-color: var(--bad); background: var(--bad-soft); }
.q.locked .opt.miss .badge { background: var(--bad); border-color: var(--bad); color: var(--card); }
.text-input.right { border-color: var(--ok); background: var(--ok-soft); }
.text-input.wrong { border-color: var(--bad); background: var(--bad-soft); }

.explanation {
  background: var(--sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.explanation summary {
  cursor: pointer;
  padding: 0.75rem 1rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent-ink);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.explanation summary::-webkit-details-marker { display: none; }
.explanation summary::before {
  content: "";
  width: 0.42rem;
  height: 0.42rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.15s;
}
.explanation[open] summary::before { transform: rotate(45deg); }
.explanation-body { padding: 0 1rem 1rem; }

/* опора на лекцию в пояснениях: > **Слайд 12.** «…» */
.q-text blockquote, .explanation-body blockquote, .lead blockquote {
  margin: 0;
  padding: 0.65rem 0.9rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 0.94rem;
}
.lead blockquote { background: var(--accent-soft); border-color: transparent; }
.q-text blockquote > * + *, .explanation-body blockquote > * + * { margin-top: 0.4rem; }
.explanation-body blockquote ul { margin: 0.3rem 0 0; padding-left: 1.2rem; list-style: disc; }
.explanation-body li + li, .q-text li + li { margin-top: 0.3rem; }
.explanation-body table, .q-text table { font-size: 0.92rem; display: block; overflow-x: auto; max-width: 100%; }
.explanation-body th, .q-text th { background: var(--accent-soft); font-weight: 600; text-align: left; }
.explanation-body > * + * { margin-top: 0.6rem; }

.only-wrong .q.is-right { display: none; }

@keyframes appear { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

/* ---------- верхняя панель ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.65rem max(1.25rem, calc((100vw - var(--wide)) / 2 + 1.25rem));
  padding-top: calc(0.65rem + env(safe-area-inset-top, 0px));
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border-bottom: 1px solid var(--line);
}
.topbar-back {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  padding: 0.35rem 0.8rem;
  margin-left: -0.8rem;
  border-radius: 999px;
  transition: background-color 0.15s;
}
.topbar-back:hover { background: var(--card); color: var(--ink); }
.topbar-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--muted);
}
.topbar-count {
  font: inherit;
  font-family: var(--display);
  font-size: 0.8rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  background: var(--ink);
  color: var(--bg);
  border: 0;
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.15s;
}
.topbar-count:hover { transform: translateY(-1px); }
.progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; }
#progress-bar { height: 100%; width: 0; background: var(--accent); border-radius: 0 2px 2px 0; transition: width 0.3s; }

/* ---------- нижняя панель: плавающая ---------- */

.actionbar {
  position: fixed;
  left: 50%;
  bottom: calc(0.9rem + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  width: min(calc(var(--wide) - 1.5rem), calc(100% - 1.5rem));
  z-index: 10;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  flex-wrap: wrap;
  padding: 0.6rem 0.6rem 0.6rem 1.2rem;
  background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow-lg);
}
.started:not(.finished) .actionbar { display: flex; }
.action-note { color: var(--muted); font-size: 0.9rem; flex: 1 1 12rem; }
.actions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-left: auto; }

/* ---------- итог ---------- */

.result {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.6rem;
  margin-bottom: 1.5rem;
  display: grid;
  gap: 1.1rem;
}
.score {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.4rem, 9vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.score small {
  display: inline-block;
  vertical-align: middle;
  font-family: var(--body);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  margin-left: 0.75rem;
}
.result-facts { color: var(--muted); margin-top: -0.4rem; }
.result-blocks { display: grid; gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.result-block { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.94rem; padding: 0.6rem 0.9rem; background: var(--sunken); }
.result-block + .result-block { border-top: 1px solid var(--line); }
.result-block-score { font-variant-numeric: tabular-nums; font-weight: 600; white-space: nowrap; }
.result-actions { display: flex; flex-wrap: wrap; gap: 0.6rem 1.2rem; align-items: center; }
.toggle { display: inline-flex; align-items: center; gap: 0.5rem; cursor: pointer; font-size: 0.94rem; }
.toggle input { accent-color: var(--accent); width: 1.1rem; height: 1.1rem; }
.save-status { color: var(--muted); font-size: 0.86rem; }
.save-status:empty { display: none; }

/* ---------- карта заданий ---------- */

.map-grid, .result-map { display: grid; grid-template-columns: repeat(auto-fill, minmax(2.6rem, 1fr)); gap: 0.4rem; }
.map-grid button, .result-map button {
  font: inherit;
  font-size: 0.86rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  aspect-ratio: 1;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--sunken);
  color: var(--ink);
  cursor: pointer;
  position: relative;
  transition: transform 0.12s;
}
.map-grid button:hover, .result-map button:hover { transform: translateY(-1px); }
.map-grid .answered { border-color: transparent; background: var(--accent); color: var(--on-accent); }
.map-grid .right, .result-map .right { border-color: transparent; background: var(--ok-soft); color: var(--ok); }
.map-grid .wrong, .result-map .wrong { border-color: transparent; background: var(--bad-soft); color: var(--bad); }
.map-grid .hinted::after {
  content: "";
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.8;
}

dialog { border: 0; padding: 0; color: var(--ink); background: var(--card); }
dialog::backdrop { background: rgba(12, 10, 24, 0.45); backdrop-filter: blur(3px); }

#map {
  width: min(28rem, 100vw);
  max-height: 80vh;
  margin: auto auto 0;
  border-radius: 24px 24px 0 0;
  padding: 1.2rem 1.2rem calc(1.2rem + env(safe-area-inset-bottom, 0px));
  box-shadow: var(--shadow-lg);
}
@media (min-width: 40rem) { #map { margin: auto; border-radius: 24px; } }
.map-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; font-weight: 600; }

#zoom { background: #fff; border-radius: 16px; max-width: 96vw; max-height: 94vh; }
#zoom img { display: block; max-width: 96vw; max-height: 94vh; }

/* ---------- главная ---------- */

.tests { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.tests li { position: relative; }
.tests li::before {
  content: attr(data-num);
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-family: var(--display);
  font-size: 0.82rem;
  font-weight: 500;
  pointer-events: none;
  z-index: 1;
  transition: background-color 0.15s, color 0.15s, transform 0.15s;
}
.tests li:hover::before { background: var(--accent); color: var(--on-accent); transform: translateY(calc(-50% - 1px)); }
.tests a {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.15rem 1rem;
  padding: 1.05rem 1.2rem 1.05rem 4.5rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.tests a:hover { border-color: var(--line-strong); transform: translateY(-1px); box-shadow: var(--shadow-lg); color: inherit; }
.t-title { font-weight: 600; font-size: 1.08rem; }
.t-meta { grid-column: 1; color: var(--muted); font-size: 0.88rem; }
.t-status { grid-column: 2; grid-row: 1 / span 2; align-self: center; font-size: 0.8rem; font-weight: 500; white-space: nowrap; }
.t-status:not(:empty) { padding: 0.3rem 0.75rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent-ink); }
.t-status.done { background: var(--ok-soft); color: var(--ok); }

/* ---------- статистика ---------- */

.admin .sheet { max-width: 60rem; }
.stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  align-items: end;
  margin-bottom: 1.75rem;
  padding: 1.1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.stats-row label { min-width: 12rem; flex: 1 1 12rem; }
.stats-scroll {
  overflow-x: auto;
  margin: 0.4rem 0 1rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.stats { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.stats th, .stats td { text-align: left; padding: 0.65rem 0.9rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.stats tbody tr:last-child td { border-bottom: 0; }
.stats tbody tr:hover td { background: var(--sunken); }
.stats th { font-weight: 500; color: var(--muted); font-size: 0.8rem; letter-spacing: 0.02em; background: var(--sunken); }
.bar { display: inline-block; height: 0.5rem; background: var(--accent); border-radius: 999px; vertical-align: middle; margin-right: 0.55rem; }
.low { color: var(--bad); font-weight: 600; }
.low .bar { background: var(--bad); }
.wrong-list { margin: 0; padding-left: 1.1rem; color: var(--muted); font-size: 0.88rem; }
.login {
  display: grid;
  gap: 1rem;
  max-width: 24rem;
  padding: 1.5rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.login .btn.primary { justify-self: start; }

/* ---------- узкие экраны ---------- */

@media (max-width: 34rem) {
  :root { font-size: 16px; }
  .sheet { padding: 1.75rem 0.75rem 9rem; }
  .q { padding: 1.1rem 1rem 1.2rem; border-radius: 18px; }
  .start, .result { padding: 1.2rem; }
  .modes { grid-template-columns: 1fr; }
  .topbar-title { display: none; }
  .topbar-back { flex: 1; margin-left: -0.5rem; }
  .opt { padding: 0.7rem 0.75rem; gap: 0.7rem; }
  .tests a { padding-left: 4.1rem; }
  .tests li::before { left: 0.9rem; width: 2.3rem; height: 2.3rem; }
  .actionbar { padding-left: 1rem; border-radius: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ---------- режим во время прохождения ---------- */

.mode-later { color: var(--muted); font-size: 0.9rem; margin-top: -0.6rem; }
.mode-bar { display: none; align-items: center; gap: 0.7rem; flex-wrap: wrap; margin: 0 0 1rem; }
.started:not(.finished) .mode-bar { display: flex; }
.mode-bar-label { color: var(--muted); font-size: 0.9rem; }
.seg { display: inline-flex; background: var(--card); border: 1.5px solid var(--line); border-radius: 999px; padding: 3px; }
.seg button {
  font: inherit;
  font-size: 0.9rem;
  border: 0;
  background: none;
  color: var(--muted);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
}
.seg button[aria-checked="true"] { background: var(--accent); color: var(--on-accent); font-weight: 500; }

/* подсказки — в тренировке; уже открытые остаются видны */
.hint-btn { display: none; }
.mode-practice .hint-btn:not([hidden]) { display: inline-block; }

/* ---------- «вернуться позже» ---------- */

.flag-btn[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.q.flagged:not(.locked) .q-num::after {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
}
.map-grid .flagged { border-style: dashed; border-color: var(--accent); }
.finished .flag-btn { display: none; }

/* ---------- примечания к ответам ---------- */

.opt-note, .answer-note {
  font-size: 0.93rem;
  color: var(--ink);
  border-top: 1px dashed var(--line);
  margin-top: 0.5rem;
  padding-top: 0.45rem;
}
.opt-note > * { margin: 0; }
.opt-note > * + * { margin-top: 0.35rem; }
.answer-note { border: 0; margin: 0; padding: 0.55rem 0.8rem; border-radius: var(--radius); background: var(--bad-soft); }
.pictures .opt-note { text-align: left; width: 100%; }

.result-kind { font-weight: 600; color: var(--accent-ink); margin-bottom: -0.5rem; }