/* Fallback tokens (home-screen app); inside Telegram the --tg-theme-* variables win. */
:root {
  color-scheme: light;
  --fb-bg: #f2f2f7; --fb-card: #ffffff; --fb-text: #111114; --fb-hint: #6d6d73; --fb-sep: #e2e2e7;
  --fb-accent: #2a78d6; --fb-accent-text: #ffffff;
  --good: #16803c; --good-bg: #e6f4ea; --bad: #c62f2f; --bad-bg: #fbe9e9; --warn: #9a6400;
  --heat-0: #e9e9ee; --heat-1: #b7d3f6; --heat-2: #6da7ec; --heat-3: #2a78d6; --heat-4: #184f95;
  --bar: #2a78d6; --track: #e9e9ee;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --fb-bg: #000000; --fb-card: #1c1c1e; --fb-text: #ffffff; --fb-hint: #8e8e93; --fb-sep: #38383a;
    --fb-accent: #3987e5;
    --good: #4cc771; --good-bg: #12301c; --bad: #ff6b6b; --bad-bg: #3a1717; --warn: #e6a700;
    --heat-0: #2c2c2e; --heat-1: #104281; --heat-2: #256abf; --heat-3: #5598e7; --heat-4: #9ec5f4;
    --bar: #3987e5; --track: #2c2c2e;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --fb-bg: #000000; --fb-card: #1c1c1e; --fb-text: #ffffff; --fb-hint: #8e8e93; --fb-sep: #38383a;
  --fb-accent: #3987e5;
  --good: #4cc771; --good-bg: #12301c; --bad: #ff6b6b; --bad-bg: #3a1717; --warn: #e6a700;
  --heat-0: #2c2c2e; --heat-1: #104281; --heat-2: #256abf; --heat-3: #5598e7; --heat-4: #9ec5f4;
  --bar: #3987e5; --track: #2c2c2e;
}
:root {
  --bg: var(--tg-theme-secondary-bg-color, var(--fb-bg));
  --card: var(--tg-theme-section-bg-color, var(--tg-theme-bg-color, var(--fb-card)));
  --text: var(--tg-theme-text-color, var(--fb-text));
  --hint: var(--tg-theme-hint-color, var(--fb-hint));
  --sep: var(--tg-theme-section-separator-color, var(--fb-sep));
  --accent: var(--tg-theme-button-color, var(--fb-accent));
  --accent-text: var(--tg-theme-button-text-color, var(--fb-accent-text));
  --link: var(--tg-theme-link-color, var(--fb-accent));
  --safe-bottom: max(env(safe-area-inset-bottom), var(--tg-safe-area-inset-bottom, 0px));
  --radius: 14px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
html { background: var(--bg); }
body {
  margin: 0; min-height: 100vh; background: var(--bg); color: var(--text);
  font: 16px/1.4 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  padding: env(safe-area-inset-top) 0 calc(72px + var(--safe-bottom));
  overscroll-behavior-y: none; -webkit-text-size-adjust: 100%;
}
body.in-ex { padding-bottom: calc(24px + var(--safe-bottom)); }
body.in-ex #tabs { display: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1 { font-size: 28px; line-height: 1.15; margin: 8px 0 2px; letter-spacing: -0.02em; }
h2 { font-size: 19px; margin: 0 0 4px; }
p { margin: 0; }
.hint { color: var(--hint); }
.small { font-size: 13px; }

#view { max-width: 560px; margin: 0 auto; padding: 12px 16px 0; }
.page > * + * { margin-top: 12px; }
.section-title {
  font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--hint);
  margin: 22px 4px 6px !important;
}
.card { background: var(--card); border-radius: var(--radius); padding: 16px; }
.card.list { padding: 0 0 0 16px; overflow: hidden; }
.empty { color: var(--hint); font-size: 15px; padding: 4px 4px 0; }

/* buttons & fields */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px;
  padding: 10px 18px; border-radius: 12px; font-weight: 600; font-size: 17px; transition: opacity .15s, transform .1s;
}
.btn:active { transform: scale(0.98); opacity: 0.85; }
.btn[disabled] { opacity: 0.45; pointer-events: none; }
.btn.primary { background: var(--accent); color: var(--accent-text); }
.btn.secondary { background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--link); }
.btn.ghost { color: var(--link); font-weight: 500; }
.btn.wide { width: 100%; }
.btn.tall { flex-direction: column; gap: 2px; min-height: 64px; }
.btn.tall small { font-weight: 400; font-size: 13px; opacity: 0.85; }
.field {
  width: 100%; font: inherit; font-size: 17px; color: var(--text); background: var(--card);
  border: 1px solid var(--sep); border-radius: 12px; padding: 12px 14px; outline: none; appearance: none;
}
.field:focus { border-color: var(--accent); }
.field::placeholder { color: var(--hint); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 14px; border-radius: 999px; background: var(--card); font-size: 15px; font-weight: 500;
  border: 1px solid var(--sep);
}
.chip.on { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.chip .n { opacity: 0.6; margin-left: 4px; font-weight: 400; }
.row {
  display: flex; align-items: center; gap: 12px; width: 100%; text-align: left; padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--sep); min-height: 52px;
}
.row:last-child { border-bottom: 0; }
.row .grow { flex: 1; min-width: 0; }
.chev { color: var(--link); font-size: 15px; white-space: nowrap; }

/* tabs */
#tabs {
  position: fixed; left: 0; right: 0; bottom: 0; display: flex; justify-content: center;
  background: var(--card); border-top: 1px solid var(--sep); padding: 6px 4px calc(6px + var(--safe-bottom));
  z-index: 10;
}
#tabs button {
  flex: 1; max-width: 140px; display: flex; flex-direction: column; align-items: center; gap: 2px;
  font-size: 11px; font-weight: 500; color: var(--hint); padding: 4px 0;
}
#tabs svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
#tabs button.on { color: var(--accent); }

/* home */
.hello h1 { margin-top: 4px; }
.streak { display: flex; align-items: center; gap: 14px; }
.streak .flame { font-size: 40px; line-height: 1; }
.streak .big { font-size: 30px; font-weight: 700; line-height: 1.1; font-variant-numeric: tabular-nums; }
.streak .big span { font-size: 17px; font-weight: 600; }
.streak .today { margin-left: auto; text-align: right; }
.streak .today b { display: block; font-size: 22px; font-variant-numeric: tabular-nums; }
.session p { margin: 2px 0 14px; }
.session.done h2 { color: var(--good); }

/* conjugation picker */
.actions { display: grid; gap: 10px; }
.look { margin-top: 10px !important; }

/* vocab */
.add { display: flex; gap: 8px; }
.add .btn { flex: none; }
.vocab-row { cursor: pointer; align-items: flex-start; }
.vocab-row s { color: var(--bad); text-decoration-thickness: 1.5px; }
.vocab-row .more { margin-top: 8px; display: none; }
.vocab-row.open .more { display: block; }
.vocab-row .del { color: var(--bad); font-size: 15px; margin-top: 8px; padding: 6px 0; }
.dots { display: flex; gap: 3px; padding-top: 7px; flex: none; }
.dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--track); }
.dots i.on { background: var(--good); }
.tag {
  display: inline-block; font-size: 12px; font-weight: 600; color: var(--hint); border: 1px solid var(--sep);
  border-radius: 6px; padding: 0 6px; margin-right: 6px;
}

/* stats */
.kpis { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.kpi { background: var(--card); border-radius: var(--radius); padding: 14px 16px; }
.kpi b { display: block; font-size: 28px; line-height: 1.15; font-variant-numeric: tabular-nums; }
.kpi span { color: var(--hint); font-size: 14px; }
.heat-wrap { display: flex; gap: 6px; }
.heat-days { display: grid; grid-template-rows: repeat(7, 1fr); gap: 3px; font-size: 10px; color: var(--hint); width: 10px; }
.heat-days span { display: flex; align-items: center; }
.heat { flex: 1; display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; grid-template-rows: repeat(7, auto); gap: 3px; }
.heat button { aspect-ratio: 1; border-radius: 4px; background: var(--heat-0); }
.heat button.l1 { background: var(--heat-1); } .heat button.l2 { background: var(--heat-2); }
.heat button.l3 { background: var(--heat-3); } .heat button.l4 { background: var(--heat-4); }
.heat button.sel { outline: 2px solid var(--text); outline-offset: 1px; }
.heat button.today { box-shadow: inset 0 0 0 1.5px var(--accent); }
.heat-foot { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; gap: 8px; }
.legend { display: flex; align-items: center; gap: 3px; font-size: 12px; color: var(--hint); flex: none; }
.legend i { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }
.bars { display: grid; gap: 12px; }
.bar-row .top { display: flex; justify-content: space-between; font-size: 15px; margin-bottom: 4px; }
.bar-row .top span { color: var(--hint); font-variant-numeric: tabular-nums; }
.track { height: 8px; border-radius: 4px; background: var(--track); overflow: hidden; }
.fill { height: 100%; border-radius: 4px; background: var(--bar); }
.cat-row { display: flex; justify-content: space-between; padding: 10px 16px 10px 0; border-bottom: 1px solid var(--sep); }
.cat-row:last-child { border-bottom: 0; }

/* exercise */
.ex-top {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
  background: var(--bg); padding: 6px 0 10px; margin: -12px 0 0;
}
.ex-top .close { font-size: 22px; width: 36px; height: 36px; border-radius: 50%; background: var(--card); flex: none; }
.ex-top .count { font-size: 14px; color: var(--hint); font-variant-numeric: tabular-nums; flex: none; }
.progress { flex: 1; height: 8px; border-radius: 4px; background: var(--track); overflow: hidden; }
.progress div { height: 100%; background: var(--accent); border-radius: 4px; transition: width .3s; }
.qcard { text-align: center; padding: 22px 16px; }
.qcard .label { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--hint); }
.qcard .verb { font-size: 30px; font-weight: 700; margin-top: 4px; letter-spacing: -0.01em; }
.qcard .meaning { color: var(--hint); }
.pill {
  display: inline-block; margin-top: 10px; padding: 4px 12px; border-radius: 999px; font-size: 14px; font-weight: 600;
  background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--link);
}
.qcard .person { font-size: 24px; margin-top: 14px; }
.qcard .person b { font-weight: 700; }
.qcard .prompt { font-size: 21px; font-weight: 600; margin-top: 8px; line-height: 1.35; }
textarea.answer { resize: none; overflow: hidden; min-height: 52px; font-size: 19px; display: block; }
.accents { display: flex; gap: 6px; }
.accents button {
  flex: 1; height: 40px; border-radius: 10px; background: var(--card); font-size: 19px; border: 1px solid var(--sep);
}
.ex-buttons { display: flex; gap: 10px; }
.ex-buttons .btn.primary { flex: 1; }
.qcard.ok { box-shadow: inset 0 0 0 2px var(--good); }
.qcard.ko { box-shadow: inset 0 0 0 2px var(--bad); }
.qcard.answered { padding: 14px 16px; }
.qcard .compact { font-size: 16px; color: var(--hint); }
.qcard .compact b { color: var(--text); }
.verdict { margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--sep); }
.verdict-title { font-weight: 700; font-size: 18px; }
.qcard.ok .verdict-title { color: var(--good); }
.qcard.ko .verdict-title { color: var(--bad); }
.verdict .yours { color: var(--hint); font-size: 15px; margin-top: 4px; }
.verdict .yours s { color: var(--bad); text-decoration-thickness: 1.5px; }
.verdict .expected { font-size: 22px; font-weight: 700; margin-top: 4px; }
.verdict .note { margin-top: 6px; font-size: 15px; color: var(--hint); }
.answer-box { display: grid; gap: 12px; }
.details { display: grid; gap: 12px; }
.details:empty { display: none; }
.rule { border-left: 4px solid var(--accent); }
.rule p { font-size: 15px; line-height: 1.45; }
.rule-title { font-weight: 700; font-size: 15px; margin-bottom: 4px; }
.quiz-icon { font-size: 22px; width: 30px; text-align: center; flex: none; }
.score { font-size: 14px; color: var(--hint); font-variant-numeric: tabular-nums; white-space: nowrap; }
.fill.done { background: var(--good); }
.conj-table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 16px; }
.conj-table td { padding: 4px 0; border-top: 1px solid color-mix(in srgb, var(--text) 10%, transparent); }
.conj-table td:first-child { color: var(--hint); width: 38%; padding-right: 8px; }
.conj-table tr.hl td { font-weight: 700; }
.conj-table tr.hl td:first-child { color: inherit; }
.waiting { display: flex; align-items: center; gap: 10px; color: var(--hint); }

/* table drill */
.fill-rows { display: grid; gap: 8px; margin-top: 14px; text-align: left; }
.fill-row { display: grid; grid-template-columns: 30% 1fr; align-items: center; gap: 10px; }
.fill-row label { color: var(--hint); font-size: 16px; text-align: right; }
.fill-row .field { padding: 10px 12px; }
.fill-row.ok .field { border-color: var(--good); background: var(--good-bg); }
.fill-row.ko .field { border-color: var(--bad); background: var(--bad-bg); }
.fill-row .fix { grid-column: 2; color: var(--bad); font-weight: 600; font-size: 15px; margin-top: -4px; }
.fill-row.ok .fix { color: var(--warn); }

/* result */
.result { text-align: center; padding: 28px 16px; }
.result .score { font-size: 52px; font-weight: 800; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.review-row { padding: 10px 16px 10px 0; border-bottom: 1px solid var(--sep); }
.review-row:last-child { border-bottom: 0; }

/* verb table */
.verb-head { text-align: center; padding: 8px 0 4px; }
.verb-head .verb { font-size: 30px; font-weight: 700; }
.tense-grid { display: grid; gap: 12px; }
.tense-grid h2 { font-size: 15px; color: var(--link); margin: 0; }

.spinner {
  width: 26px; height: 26px; margin: 40px auto; border-radius: 50%;
  border: 3px solid var(--track); border-top-color: var(--accent); animation: spin .8s linear infinite;
}
.waiting .spinner { margin: 0; width: 18px; height: 18px; border-width: 2.5px; }
@keyframes spin { to { transform: rotate(360deg); } }
.error { color: var(--bad); }
.toast {
  position: fixed; left: 50%; bottom: calc(84px + var(--safe-bottom)); transform: translateX(-50%);
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-size: 15px;
  max-width: calc(100% - 32px); z-index: 20; box-shadow: 0 4px 16px rgba(0,0,0,.2); animation: rise .2s ease-out;
}
@keyframes rise { from { transform: translate(-50%, 8px); opacity: 0; } }
.shake { animation: shake .3s; }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }