/* Layout: one narrow working column like a calc sheet; a drawing title block opens the day, exercises sit on one card */
:root {
  --bg: #eef1f3;
  --surface: #ffffff;
  --ink: #15212c;
  --muted: #5a6876;
  --line: #d3dae0;
  --grid: #e3e8ec;
  --accent: #1d5fa8;
  --accent-ink: #ffffff;
  --accent-soft: #e2ecf7;
  --good: #2c7a4b;
  --good-soft: #e3f2e8;
  --bad: #b23b35;
  --bad-soft: #f8e6e4;
  --warn: #9a6512;
  --font-display: "IBM Plex Sans Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f151b; --surface: #17212a; --ink: #e4eaef; --muted: #93a1ae; --line: #2a3743; --grid: #1c2731;
    --accent: #6ea6e6; --accent-ink: #0c1620; --accent-soft: #1b2d42;
    --good: #6cc392; --good-soft: #17301f; --bad: #ec8a83; --bad-soft: #3a1e1c; --warn: #e2b05c;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f151b; --surface: #17212a; --ink: #e4eaef; --muted: #93a1ae; --line: #2a3743; --grid: #1c2731;
  --accent: #6ea6e6; --accent-ink: #0c1620; --accent-soft: #1b2d42;
  --good: #6cc392; --good-soft: #17301f; --bad: #ec8a83; --bad-soft: #3a1e1c; --warn: #e2b05c;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 var(--font-body);
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 16px 40px;
}
.wrap { max-width: 640px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
header.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand b { font: 600 22px/1 var(--font-display); letter-spacing: 0.01em; }
.brand span { font: 12px var(--font-mono); color: var(--muted); }
nav.tabs { display: flex; gap: 4px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 3px; }
nav.tabs button { border: 0; background: transparent; color: var(--muted); font: 500 14px var(--font-body); padding: 6px 12px; border-radius: 6px; cursor: pointer; }
nav.tabs button[aria-current="page"] { background: var(--accent-soft); color: var(--ink); }
button { font-family: inherit; }
button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0; text-wrap: balance; }
h2 { font-size: 20px; }
.label { font: 500 11px var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }

.stamp { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1px solid var(--ink); background: var(--surface); }
.stamp > div { padding: 6px 10px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); min-width: 0; }
.stamp > div:nth-child(3n) { border-right: 0; }
.stamp > div:nth-last-child(-n+3) { border-bottom: 0; }
.stamp .k { font: 10.5px var(--font-mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.stamp .v { font: 500 14px var(--font-body); overflow-wrap: anywhere; }
.stamp .wide { grid-column: span 2; }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.plan { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.plan .n { font: 600 30px/1 var(--font-display); font-variant-numeric: tabular-nums; }
.plan .d { font-size: 13px; color: var(--muted); }
.btn { border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 8px; padding: 10px 16px; font: 500 15px var(--font-body); cursor: pointer; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.05); }
.btn.big { width: 100%; padding: 14px 16px; font-size: 16px; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn[disabled] { opacity: 0.45; cursor: default; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.note { font-size: 13px; color: var(--muted); }

.themes { display: flex; flex-direction: column; gap: 12px; }
.theme-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 12px; align-items: baseline; }
.theme-row .nm { font-weight: 500; }
.theme-row .ct { font: 12px var(--font-mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.bar { grid-column: 1 / -1; display: flex; height: 6px; background: var(--grid); border-radius: 3px; overflow: hidden; }
.bar i { display: block; height: 100%; }
.bar .k { background: var(--good); }
.bar .l { background: var(--accent); opacity: 0.55; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--muted); }
.legend span::before { content: ""; display: inline-block; width: 10px; height: 6px; border-radius: 2px; margin-right: 6px; vertical-align: middle; }
.legend .k::before { background: var(--good); }
.legend .l::before { background: var(--accent); opacity: 0.55; }
.legend .n::before { background: var(--grid); border: 1px solid var(--line); }

.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg button { border: 0; background: var(--surface); color: var(--muted); padding: 6px 12px; font: 500 13px var(--font-body); cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--accent-soft); color: var(--ink); }
.settings { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px 16px; align-items: center; }
.settings .sl { font-size: 14px; }

/* session */
.sess-top { display: flex; align-items: center; gap: 12px; }
.progress { flex: 1; height: 8px; background: var(--grid); border-radius: 4px; overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--accent); transition: width 0.25s; }
.count { font: 12px var(--font-mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 22px 18px; display: flex; flex-direction: column; gap: 18px; min-height: 340px; }
.kind { display: flex; justify-content: space-between; gap: 8px; align-items: center; flex-wrap: wrap; }
.stage { font: 11px var(--font-mono); color: var(--muted); }
.prompt { font: 600 28px/1.15 var(--font-display); overflow-wrap: anywhere; }
.prompt.ru { font: 500 22px/1.3 var(--font-body); }
.sentence { font-size: 19px; line-height: 1.55; }
.sentence .gap { display: inline-block; min-width: 5em; border-bottom: 2px solid var(--accent); }
.sub { font-size: 14px; color: var(--muted); }
.variant { display: inline-block; font: 11px var(--font-mono); padding: 1px 6px; border: 1px solid var(--line); border-radius: 4px; color: var(--muted); margin-left: 6px; vertical-align: middle; }
.options { display: grid; gap: 8px; }
.opt { text-align: left; border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 8px; padding: 12px 14px; font: 16px var(--font-body); cursor: pointer; display: flex; gap: 10px; align-items: baseline; }
.opt:hover:not([disabled]) { border-color: var(--accent); }
.opt .key { font: 11px var(--font-mono); color: var(--muted); min-width: 1.2em; }
.opt.right { border-color: var(--good); background: var(--good-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt[disabled] { cursor: default; }
.speak { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 999px; padding: 6px 12px; font: 500 14px var(--font-body); cursor: pointer; }
.speak svg { width: 16px; height: 16px; }
.speak.huge { padding: 18px 26px; font-size: 16px; align-self: center; }
.tiles { display: flex; flex-wrap: wrap; gap: 8px; }
.tiles.answer { min-height: 52px; padding: 8px; border: 1px dashed var(--line); border-radius: 8px; }
.tile { border: 1px solid var(--line); background: var(--bg); color: var(--ink); border-radius: 6px; padding: 7px 10px; font: 16px var(--font-body); cursor: pointer; }
.tile.used { visibility: hidden; }
input.type { width: 100%; font: 20px var(--font-body); padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); }
.hint { font: 15px var(--font-mono); color: var(--muted); letter-spacing: 0.05em; }
.feedback { border-radius: 10px; padding: 14px; display: flex; flex-direction: column; gap: 8px; }
.feedback.good { background: var(--good-soft); }
.feedback.bad { background: var(--bad-soft); }
.feedback .verdict { font-weight: 600; }
.feedback.good .verdict { color: var(--good); }
.feedback.bad .verdict { color: var(--bad); }
.feedback .term { font: 600 20px var(--font-display); }
.ex { font-size: 15px; }
.ex-ru { font-size: 14px; color: var(--muted); }
.actions { display: flex; gap: 10px; justify-content: flex-end; flex-wrap: wrap; margin-top: auto; }

/* dictionary */
.filters { display: flex; gap: 6px; flex-wrap: wrap; }
.chip { border: 1px solid var(--line); background: var(--surface); color: var(--muted); border-radius: 999px; padding: 4px 12px; font: 500 13px var(--font-body); cursor: pointer; }
.chip[aria-pressed="true"] { border-color: var(--accent); color: var(--ink); background: var(--accent-soft); }
.dict-group { display: flex; flex-direction: column; }
.dict-group h3 { font-size: 16px; padding: 14px 0 6px; border-bottom: 1px solid var(--ink); }
.entry { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 12px; padding: 10px 0; border-bottom: 1px solid var(--line); align-items: center; }
.entry .en { font: 600 17px var(--font-display); overflow-wrap: anywhere; }
.entry .ru { font-size: 14px; color: var(--muted); }
.entry .meta { display: flex; align-items: center; gap: 10px; }
.ticks { display: inline-flex; gap: 3px; }
.ticks i { width: 10px; height: 4px; border-radius: 1px; background: var(--grid); border: 1px solid var(--line); }
.ticks i.on { background: var(--accent); border-color: var(--accent); }
.ticks.known i.on { background: var(--good); border-color: var(--good); }
.entry .due { font: 11px var(--font-mono); color: var(--muted); min-width: 64px; text-align: right; font-variant-numeric: tabular-nums; }
.icon-btn { border: 1px solid var(--line); background: var(--surface); color: var(--ink); border-radius: 999px; width: 32px; height: 32px; display: inline-grid; place-items: center; cursor: pointer; }
.icon-btn svg { width: 15px; height: 15px; }
.result-list { display: flex; flex-direction: column; gap: 6px; }
.result-list div { display: flex; justify-content: space-between; gap: 12px; border-bottom: 1px solid var(--line); padding: 6px 0; font-size: 15px; }
.result-list div span:last-child { color: var(--muted); text-align: right; }
.danger { color: var(--bad); }
@media (max-width: 460px) {
  .prompt { font-size: 24px; }
  .plan .n { font-size: 26px; }
  .stamp { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stamp > div { border-right: 1px solid var(--line) !important; border-bottom: 1px solid var(--line) !important; }
  .stamp > div:nth-child(2n) { border-right: 0 !important; }
  .stamp .wide { grid-column: span 2; border-right: 0 !important; }
  .settings { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .settings .seg { justify-self: start; margin-bottom: 8px; }
}
@media (prefers-reduced-motion: reduce) { .progress i { transition: none; } }

/* login */
.login { max-width: 380px; margin: 8vh auto 0; display: flex; flex-direction: column; gap: 18px; }
.login form { display: flex; flex-direction: column; gap: 12px; }
.login label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--muted); }
.login select { font: 16px var(--font-body); padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); }
.login input[type="checkbox"] { width: 18px; height: 18px; padding: 0; accent-color: var(--accent); }
.login input { font: 17px var(--font-body); padding: 11px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); }
.login .err { color: var(--bad); font-size: 14px; min-height: 1.4em; }
.netbadge { font: 11px var(--font-mono); color: var(--warn); border: 1px solid var(--warn); border-radius: 999px; padding: 2px 8px; }
.loading { padding: 20vh 0; text-align: center; color: var(--muted); }

/* assistant chat */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.chat { display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 88%; padding: 10px 14px; border-radius: 14px; font-size: 15px; line-height: 1.5; overflow-wrap: anywhere; }
.bubble p { margin: 0; }
.bubble p + p { margin-top: 8px; }
.bubble.assistant { align-self: flex-start; background: var(--surface); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.bubble.user { align-self: flex-end; background: var(--accent-soft); border-bottom-right-radius: 4px; }
.bubble.typing { color: var(--muted); }
.proposal { margin-top: 10px; padding: 12px; border: 1px solid var(--accent); border-radius: 10px; display: flex; flex-direction: column; gap: 8px; background: var(--bg); }
.proposal ol { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 4px; }
.proposal .btn { align-self: flex-start; }
.chat-form { display: flex; gap: 8px; align-items: flex-end; position: sticky; bottom: 0; padding-block: 8px; background: var(--bg); }
.chat-form textarea { flex: 1; min-width: 0; resize: vertical; font: 16px/1.4 var(--font-body); padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); }
.linkish { border: 0; background: none; padding: 0; color: var(--accent); font: inherit; cursor: pointer; text-decoration: underline; text-underline-offset: 2px; }