/* МатЛегко — дизайн-система «Calm Intelligence» (ТЗ §8): токены, база, компоненты, витрина, тренажёр. */

@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/fonts/onest/onest-cyrillic-wght-normal.woff2) format('woff2-variations');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: 'Onest';
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url(/fonts/onest/onest-latin-wght-normal.woff2) format('woff2-variations');
  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+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ---------- токены */
:root {
  --paper: #F7F7F2; --surface: #FFFFFF; --mist: #EEF3F1; --lilac-mist: #EFEEF8;
  --ink: #1D2731; --ink-2: #44515E; --muted: #6E7B88; --line: #E3E6E1; --grid: rgba(46,106,142,.08);
  --primary: #2E6A8E; --primary-hover: #255A79; --primary-soft: #E2EEF5; --on-primary: #FFFFFF;
  --sage: #6E9C86; --lilac: #7A74C4; --amber: #E3A640;
  --ok: #2F8A5F; --ok-soft: #E3F3EA; --warn: #A86E14; --warn-soft: #FBF1DE; --bad: #B9473F; --bad-soft: #F9E6E5;
  --radius: 22px; --radius-sm: 12px; --shadow: 0 1px 2px rgba(29,39,49,.05), 0 10px 30px rgba(29,39,49,.07);
  --header-bg: rgba(247,247,242,.78);
  --font: 'Onest', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --gutter: 20px; --section: 96px; --maxw: 1120px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #11171C; --surface: #182027; --mist: #18231F; --lilac-mist: #1D1C2A; --ink: #E7ECEF; --ink-2: #B8C2CB;
    --muted: #8C98A3; --line: #27323B; --grid: rgba(125,179,214,.08); --primary: #7DB3D6; --primary-hover: #98C4E1;
    --primary-soft: #1A2B37; --on-primary: #0E151B; --sage: #8DBBA5; --lilac: #A9A4E8; --amber: #F0BC5E;
    --ok: #5CC08E; --ok-soft: #15281F; --warn: #E3B062; --warn-soft: #2A2214; --bad: #E9837C; --bad-soft: #2C1A19;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.25);
    --header-bg: rgba(17,23,28,.78);
  }
}
@media (max-width: 720px) { :root { --section: 56px; } }
@media (max-width: 360px) { :root { --gutter: 16px; } }

/* ---------- база */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.6 var(--font);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
body.no-scroll { overflow: hidden; }
img, svg { max-width: 100%; }
a { color: var(--primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--primary-hover); }
h1, h2, h3, .h2, .h3 { color: var(--ink); font-weight: 680; letter-spacing: -0.025em; line-height: 1.1; margin: 0 0 .5em; text-wrap: balance; }
h1 { font-size: clamp(2.4rem, 6vw, 4.25rem); line-height: 1.04; }
h2, .h2 { font-size: clamp(1.9rem, 4vw, 2.75rem); }
h3, .h3 { font-size: 1.2rem; letter-spacing: -0.015em; line-height: 1.3; }
p { margin: 0 0 1em; }
.lead { font-size: clamp(1.1rem, 2vw, 1.3rem); color: var(--ink-2); line-height: 1.55; max-width: 40em; text-wrap: pretty; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
.center { text-align: center; }
.center .lead { margin-inline: auto; }
.eyebrow { font-size: .9rem; font-weight: 600; color: var(--primary); letter-spacing: .01em; margin-bottom: 1rem; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--surface); padding: 8px 14px; border-radius: 8px; }
.skip:focus { left: 8px; }
.i { width: 20px; height: 20px; flex: none; }
[hidden] { display: none !important; }

/* ---------- сетка и секции */
.wrap { max-width: calc(var(--maxw) + 2 * var(--gutter)); margin: 0 auto; padding: 0 var(--gutter); }
.narrow { max-width: calc(760px + 2 * var(--gutter)); }
.section { padding: var(--section) 0; }
.page-top { padding-top: calc(var(--section) * .6); }
.bg-mist { background: var(--mist); }
.bg-lilac { background: var(--lilac-mist); }
.section-title { margin-bottom: .7em; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.split { display: grid; gap: 48px; grid-template-columns: 1fr 1.1fr; align-items: center; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 28px; } }
.stack > * + * { margin-top: 16px; }
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .3s ease, transform .3s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- кнопки */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 22px;
  border-radius: 999px; border: 1px solid transparent; font: 600 1rem/1.2 var(--font); text-decoration: none;
  cursor: pointer; transition: background .15s, color .15s, border-color .15s, transform .1s; white-space: nowrap;
  color: var(--ink); background: transparent; -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(.98); }
.btn-primary { background: var(--primary); color: var(--on-primary); }
.btn-primary:hover { background: var(--primary-hover); color: var(--on-primary); }
.btn-soft { background: var(--primary-soft); color: var(--primary); }
.btn-soft:hover { color: var(--primary-hover); background: color-mix(in srgb, var(--primary-soft) 80%, var(--primary) 20%); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn-ghost:hover { border-color: var(--muted); color: var(--ink); }
.btn-lg { min-height: 54px; padding: 0 28px; font-size: 1.05rem; }
.btn-sm { min-height: 44px; padding: 0 16px; font-size: .95rem; }
.btn-block { width: 100%; }
.btn .i { width: 18px; height: 18px; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0; }
.icon-btn {
  display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; border: 0;
  background: transparent; color: var(--ink); cursor: pointer;
}
.icon-btn:hover { background: var(--mist); }
.linklike { background: none; border: 0; padding: 8px 0; color: var(--primary); cursor: pointer; font: inherit; text-decoration: underline; text-underline-offset: 3px; }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; text-decoration: none; }
.link-arrow .i { width: 18px; height: 18px; transition: transform .15s; }
.link-arrow:hover .i { transform: translateX(3px); }

/* ---------- карточки, чипы, формы */
.card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; min-height: 40px; padding: 0 16px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--line); color: var(--ink); font-weight: 500; font-size: .95rem;
  text-decoration: none; cursor: pointer; position: relative;
}
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip:has(input:checked), .chip.is-on { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }
.chip:has(input:focus-visible) { outline: 3px solid var(--primary); outline-offset: 2px; }
.badge { display: inline-block; font-size: .78rem; font-weight: 600; padding: 3px 10px; border-radius: 999px; background: var(--ok-soft); color: var(--ok); vertical-align: middle; margin-right: 10px; letter-spacing: 0; }
.field { display: block; border: 0; padding: 0; margin: 0 0 18px; min-width: 0; }
.field legend, .label { display: block; font-weight: 600; font-size: .95rem; margin-bottom: 8px; padding: 0; }
.input {
  width: 100%; min-height: 50px; padding: 12px 16px; border-radius: var(--radius-sm); border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); font: inherit; transition: border-color .15s, box-shadow .15s;
}
.input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
textarea.input { resize: vertical; line-height: 1.5; }
.alert { padding: 12px 16px; border-radius: var(--radius-sm); margin: 0 0 16px; }
.alert-bad { background: var(--bad-soft); color: var(--bad); }
.alert-ok { background: var(--ok-soft); color: var(--ok); }
.seg { display: inline-flex; gap: 4px; padding: 4px; background: var(--mist); border-radius: 999px; margin: 8px 0 32px; flex-wrap: wrap; }
.seg a, .seg button {
  min-height: 42px; padding: 0 18px; display: inline-flex; align-items: center; border-radius: 999px; border: 0; background: none;
  color: var(--ink-2); font: 600 .95rem var(--font); text-decoration: none; cursor: pointer;
}
.seg .is-on, .seg [aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 3px rgba(29,39,49,.12); }
.seg-full { display: flex; }
.seg-full a { flex: 1; justify-content: center; }
.seg-sm { margin: 0; }
.seg-sm button { min-height: 36px; padding: 0 14px; font-size: .9rem; }

/* ---------- шапка */
.site-header {
  position: sticky; top: 0; z-index: 50; background: var(--header-bg);
  -webkit-backdrop-filter: saturate(180%) blur(16px); backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
}
.header-row { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; flex: none; }
.logo-word { font-size: 1.2rem; letter-spacing: -0.03em; }
.logo-word b { font-weight: 700; color: var(--ink); }
.logo-word i { font-style: normal; font-weight: 700; color: var(--primary); }
.main-nav { display: flex; gap: 4px; margin-left: auto; }
.main-nav a { color: var(--ink-2); text-decoration: none; font-weight: 500; font-size: .97rem; padding: 10px 12px; border-radius: 10px; }
.main-nav a:hover, .main-nav a[aria-current] { color: var(--ink); }
.main-nav .nav-login { display: none; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.header-login { color: var(--ink-2); text-decoration: none; font-weight: 500; padding: 10px 8px; }
.menu-btn { display: none; }
@media (max-width: 960px) {
  .header-row { gap: 12px; min-height: 60px; }
  .header-actions { margin-left: auto; }
  .header-login { display: none; }
  .menu-btn { display: inline-grid; }
  .main-nav {
    position: fixed; inset: 60px 0 auto 0; flex-direction: column; gap: 0; margin: 0; padding: 8px var(--gutter) 24px;
    background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: 0 20px 30px rgba(29,39,49,.08);
    transform: translateY(-8px); opacity: 0; visibility: hidden; transition: opacity .2s, transform .2s, visibility .2s;
  }
  .main-nav a { font-size: 1.25rem; font-weight: 600; padding: 14px 4px; border-bottom: 1px solid var(--line); border-radius: 0; color: var(--ink); }
  .main-nav .nav-login { display: block; border-bottom: 0; color: var(--primary); }
  .nav-open .main-nav { opacity: 1; transform: none; visibility: visible; }
}
@media (max-width: 380px) { .logo-word { font-size: 1.05rem; } .header-actions .btn-sm { padding: 0 14px; } }

/* шапка кабинета */
.cab-tabs { display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none; margin-left: 8px; }
.cab-tabs a { padding: 10px 12px; border-radius: 10px; color: var(--ink-2); text-decoration: none; font-weight: 500; white-space: nowrap; font-size: .95rem; }
.cab-tabs a.is-active { background: var(--primary-soft); color: var(--primary); }
.logout-form { margin-left: auto; }
.logout-form .btn span { display: inline; }
@media (max-width: 900px) {
  .cab-header .header-row { flex-wrap: wrap; padding-bottom: 6px; }
  .cab-tabs { order: 3; width: 100%; margin: 0 calc(-1 * var(--gutter)); padding: 0 var(--gutter); }
  .logout-form .btn span { display: none; }
}

/* ---------- первый экран */
.hero { padding: clamp(40px, 7vw, 96px) 0 var(--section); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero h1 { margin-bottom: .35em; }
.trust { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 22px; color: var(--ink-2); font-size: .95rem; }
.trust li { display: inline-flex; align-items: center; gap: 8px; }
.trust a { color: inherit; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; }
.trust a:hover { color: var(--primary); }
.trust .i { width: 18px; height: 18px; color: var(--muted); }
.i-star { color: var(--amber) !important; fill: var(--amber); }
.notebook {
  background-color: var(--surface);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
}
.hero-visual { position: relative; border-radius: 32px; padding: 72px 36px; box-shadow: inset 0 0 0 1px var(--line); }
.hero-visual .trainer { position: relative; z-index: 1; }
.float-chip {
  position: absolute; z-index: 2; background: var(--surface); border-radius: 999px; padding: 8px 16px; box-shadow: var(--shadow);
  font-size: .95rem; color: var(--ink); white-space: nowrap; animation: bob 7s ease-in-out infinite;
}
.float-chip .katex { font-size: 1.05em; }
.fc-1 { top: 18px; left: 22px; background: var(--primary-soft); }
.fc-2 { top: 14px; right: 18px; animation-delay: -2s; }
.fc-3 { bottom: 20px; left: 36px; animation-delay: -4s; background: var(--ok-soft); }
.fc-4 { bottom: 16px; right: 26px; animation-delay: -5.5s; background: var(--lilac-mist); }
@keyframes bob { 0%, 100% { transform: translateY(0) rotate(-1deg); } 50% { transform: translateY(-8px) rotate(1deg); } }
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-visual { padding: 64px 14px; border-radius: 26px; }
  .fc-2, .fc-4 { display: none; }
  .fc-1 { left: 14px; top: 14px; } .fc-3 { left: auto; right: 14px; bottom: 14px; }
}

/* ---------- витрина */
.icon-bubble { display: inline-grid; place-items: center; width: 48px; height: 48px; border-radius: 14px; background: var(--primary-soft); color: var(--primary); margin-bottom: 18px; }
.icon-bubble .i { width: 24px; height: 24px; }
.help-grid .help-card:nth-child(2) .icon-bubble { background: var(--ok-soft); color: var(--sage); }
.help-grid .help-card:nth-child(3) .icon-bubble { background: var(--lilac-mist); color: var(--lilac); }
.help-grid .help-card:nth-child(4) .icon-bubble { background: var(--warn-soft); color: var(--warn); }
.help-card p { color: var(--ink-2); margin: 0; }
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr)); }
.step { background: var(--surface); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.step p { margin: 0; color: var(--ink-2); }
.step-num { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--primary); color: var(--on-primary); font-weight: 700; margin-bottom: 18px; }
.about { display: grid; grid-template-columns: auto 1fr; gap: 48px; align-items: start; }
.monogram {
  width: 168px; height: 168px; border-radius: 44px; display: grid; place-items: center; font-size: 3.6rem; font-weight: 700;
  letter-spacing: -0.04em; color: var(--lilac); background: var(--surface); box-shadow: var(--shadow);
}
@media (max-width: 720px) { .about { grid-template-columns: 1fr; gap: 24px; } .monogram { width: 96px; height: 96px; border-radius: 28px; font-size: 2.2rem; } }
.more summary { cursor: pointer; color: var(--primary); font-weight: 600; margin-bottom: 12px; list-style: none; }
.more summary::-webkit-details-marker { display: none; }
.more summary::after { content: ' ↓'; }
.more[open] summary::after { content: ' ↑'; }
.more p { color: var(--ink-2); max-width: 40em; }
.facts { list-style: none; padding: 0; margin: 24px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.facts li { background: var(--surface); padding: 8px 16px; border-radius: 999px; font-weight: 500; font-size: .95rem; }
.review { display: flex; flex-direction: column; }
.review blockquote { margin: 12px 0 18px; flex: 1; }
.review blockquote p { margin: 0; color: var(--ink); }
.review footer { display: flex; flex-direction: column; font-size: .92rem; }
.stars { display: flex; gap: 2px; }
.stars .i { width: 16px; height: 16px; }
.masonry { columns: 3 320px; column-gap: 20px; margin: 32px 0 40px; }
.masonry .review { break-inside: avoid; margin-bottom: 20px; }
.price-card { padding: clamp(24px, 4vw, 40px); }
.price-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; border-bottom: 1px solid var(--line); padding-bottom: 20px; margin-bottom: 20px; }
.price-head h3 { margin: 0 0 4px; font-size: 1.35rem; }
.price-head p { margin: 0; }
.price { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; letter-spacing: -0.02em; color: var(--primary); }
.checklist { list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 14px; }
.checklist li { display: flex; gap: 12px; color: var(--ink-2); }
.checklist .i { color: var(--ok); margin-top: 3px; }
.contact-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 28px; }
.topic-card { display: flex; flex-direction: column; }
.topic-card p { flex: 1; }
.topic-levels { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.quarter-title { font-size: 1.35rem; margin: 8px 0 18px; display: flex; align-items: center; }
.quarter-title ~ .grid { margin-bottom: 40px; }
.empty { text-align: center; max-width: 520px; }
.back { display: inline-block; margin-bottom: 16px; text-decoration: none; font-weight: 500; }
.level-chips { margin-bottom: 24px; }
.prose h2 { margin-top: 1.6em; }
.prose p { color: var(--ink-2); }

/* ---------- подвал */
.site-footer { border-top: 1px solid var(--line); padding: 48px 0 56px; font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; }
.footer-grid .logo { margin-bottom: 12px; }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { color: var(--ink-2); text-decoration: none; }
.footer-links a:hover { color: var(--primary); }
.footer-note p { margin: 0 0 8px; }
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr; gap: 24px; } }

/* ---------- окно-шторка */
.sheet {
  border: 0; padding: 0; border-radius: 28px; width: min(560px, calc(100% - 32px)); max-height: calc(100dvh - 48px);
  background: var(--surface); color: var(--ink); box-shadow: 0 30px 80px rgba(0,0,0,.25);
}
.sheet::backdrop { background: rgba(17,23,28,.42); -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); }
.sheet[open] { animation: sheet-in .25s ease; }
.sheet-body { padding: 24px 28px 28px; }
.sheet-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.sheet-head h2 { font-size: 1.5rem; margin: 0; }
.contact-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 6px 0 14px; }
.contact-buttons .btn:first-child { grid-column: 1 / -1; }
.msg { font-size: .95rem; color: var(--ink-2); background: var(--paper); }
@keyframes sheet-in { from { opacity: 0; transform: translateY(16px); } }
@media (max-width: 600px) {
  .sheet { width: 100%; max-width: 100%; margin: auto 0 0; border-radius: 28px 28px 0 0; max-height: 92dvh; }
  .sheet-body { padding: 20px var(--gutter) calc(24px + env(safe-area-inset-bottom)); }
  @keyframes sheet-in { from { transform: translateY(40%); } }
}

/* ---------- вход */
.login-wrap { display: grid; place-items: center; }
.login-card { width: min(440px, 100%); padding: 36px clamp(20px, 5vw, 40px); }
.login-mark { display: flex; justify-content: center; margin-bottom: 18px; }
.login-card .seg { margin: 8px 0 24px; background: var(--paper); }
.login-card .seg .is-on { background: var(--primary-soft); color: var(--primary); }
.input-code { font-size: 1.4rem; letter-spacing: .12em; text-align: center; text-transform: uppercase; font-variant-numeric: tabular-nums; }

/* ---------- расписание */
.sched-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.sched-head p { margin: 0; }
.sched-legend { display: flex; align-items: center; gap: 8px; color: var(--muted); }
.lg { display: inline-block; width: 14px; height: 14px; border-radius: 4px; margin-left: 6px; }
.lg-free { background: var(--surface); box-shadow: inset 0 0 0 1px var(--primary); }
.lg-busy { background: var(--line); }
.sched-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 148px), 1fr)); }
.sched-day { background: var(--surface); border-radius: 18px; padding: 16px 14px; box-shadow: var(--shadow); }
.sched-day h3 { font-size: 1rem; margin-bottom: 12px; }
.sched-slots { display: grid; grid-template-columns: repeat(auto-fill, minmax(58px, 1fr)); gap: 6px; }
.slot {
  min-height: 40px; border-radius: 10px; border: 1px solid color-mix(in srgb, var(--primary) 40%, var(--line)); background: var(--surface);
  color: var(--primary); font: 600 .9rem var(--font); cursor: pointer; font-variant-numeric: tabular-nums;
}
.slot:hover { background: var(--primary-soft); }
.slot.is-busy { background: var(--paper); border-color: transparent; color: var(--muted); text-decoration: line-through; cursor: default; opacity: .7; }
@media (max-width: 600px) { .sched-grid { grid-template-columns: 1fr 1fr; } }

/* ---------- тренажёр */
.trainer { width: 100%; }
.tr-card {
  background-color: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: clamp(20px, 4vw, 32px);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px; background-position: -1px -1px; transition: box-shadow .3s;
}
.tr-card.is-correct { box-shadow: 0 0 0 2px var(--ok), var(--shadow); }
.tr-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-size: .9rem; color: var(--muted); margin-bottom: 14px; }
.tr-topic { font-weight: 600; color: var(--primary); }
.tr-level { color: var(--muted); font-weight: 500; }
.tr-count { font-variant-numeric: tabular-nums; }
.tr-prompt { font-size: clamp(1.2rem, 2.6vw, 1.45rem); line-height: 1.5; font-weight: 500; margin-bottom: 18px; overflow-wrap: anywhere; }
.tr-prompt .katex { font-size: 1.1em; }
.tr-figure { display: block; margin: 0 auto 18px; max-height: 240px; color: var(--ink); }
.tr-answer { margin-bottom: 14px; }
.tr-input { font-size: 1.3rem; font-variant-numeric: tabular-nums; min-height: 56px; }
.tr-input.is-bad { border-color: var(--warn); }
.tr-input[readonly] { border-color: var(--ok); background: var(--ok-soft); }
.tr-preview { min-height: 1.8em; padding: 6px 4px 0; color: var(--muted); font-size: .95rem; }
.tr-sys { margin-top: 4px; }
.tr-choices { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.tr-choice { min-width: 72px; font-size: 1.15rem; }
.tr-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.tr-feedback:empty { display: none; }
.tr-feedback { border-radius: 16px; padding: 14px 16px; margin: 0 0 14px; animation: fb-in .25s ease; }
.fb-title { font-weight: 650; display: flex; align-items: center; gap: 10px; }
.fb-text { margin-top: 4px; color: var(--ink-2); }
.fb-correct { background: var(--ok-soft); color: var(--ok); }
.fb-bad { background: var(--bad-soft); color: var(--bad); }
.fb-warn { background: var(--warn-soft); color: var(--warn); }
.fb-hint { background: var(--primary-soft); color: var(--primary); }
.tick { width: 26px; height: 26px; border-radius: 50%; background: var(--ok); position: relative; animation: pop .35s cubic-bezier(.3,1.6,.5,1); }
.tick::after { content: ''; position: absolute; left: 9px; top: 5px; width: 6px; height: 11px; border: solid var(--surface); border-width: 0 2.5px 2.5px 0; transform: rotate(45deg); }
@keyframes pop { from { transform: scale(.3); opacity: 0; } }
@keyframes fb-in { from { opacity: 0; transform: translateY(-4px); } }
.tr-steps { margin: 0 0 14px; padding: 14px 16px 14px 36px; background: var(--paper); border-radius: 16px; display: grid; gap: 8px; }
.tr-steps li { animation: fb-in .25s ease; }
.tr-final { font-weight: 650; margin: -4px 0 14px; padding-left: 4px; }
.tr-done { text-align: center; }
.tr-done .tr-actions { justify-content: center; margin-top: 8px; }
.tr-score { font-size: 1.6rem; font-weight: 600; margin: 0 0 6px; }
.tr-score b { font-size: 3.2rem; color: var(--primary); letter-spacing: -0.03em; }
.trainer-compact .tr-card { box-shadow: 0 20px 50px rgba(29,39,49,.12); background-image: none; }
.trainer-compact .tr-prompt { font-size: 1.25rem; }

/* клавиатура */
.keypad { display: grid; grid-template-columns: 3fr 2fr; gap: 8px; margin-top: 8px; max-width: 460px; user-select: none; -webkit-user-select: none; }
.keypad-digits { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.keypad-ops { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; align-content: start; }
.keypad-ops[data-n="12"] { grid-template-columns: repeat(3, 1fr); }
/* Мало операций (число): цифры шире, операции — одним столбцом. */
.keypad-narrow { grid-template-columns: 3fr 1fr; }
.keypad-narrow .keypad-ops { grid-template-columns: 1fr; }
.key {
  min-height: 46px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  font: 500 1.15rem var(--font); cursor: pointer; touch-action: manipulation; -webkit-tap-highlight-color: transparent;
}
.key:hover { background: var(--mist); }
.key:active { background: var(--primary-soft); transform: scale(.97); }
.key-digit { font-variant-numeric: tabular-nums; }
.key-del { color: var(--bad); font-family: system-ui, sans-serif; }
@media (pointer: fine) and (min-width: 720px) { .trainer-compact .keypad { display: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}