:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #eef0f3;
  --border: #d9dde3;
  --text: #1b1f24;
  --muted: #5f6b7a;
  --accent: #0f9d76;
  --accent-soft: rgba(15, 157, 118, .12);
  --ok: #17a34a;
  --ok-soft: rgba(23, 163, 74, .14);
  --bad: #dc2626;
  --bad-soft: rgba(220, 38, 38, .12);
  --warn: #d97706;
  --warn-soft: rgba(217, 119, 6, .16);
  --shadow: 0 1px 2px rgba(0, 0, 0, .06), 0 4px 14px rgba(0, 0, 0, .06);
  --radius: 10px;
  --mono: ui-monospace, "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --g-web: #2563eb;
  --g-data: #7c3aed;
  --g-obs: #db2777;
  --g-platform: #c2570c;
  --g-infra: #0891b2;
  --g-net: #a16207;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --surface: #171b21;
    --surface-2: #1e232b;
    --border: #2b323c;
    --text: #e6e9ee;
    --muted: #8b96a5;
    --accent: #2dd4a4;
    --accent-soft: rgba(45, 212, 164, .12);
    --ok: #34d399;
    --ok-soft: rgba(52, 211, 153, .14);
    --bad: #f87171;
    --bad-soft: rgba(248, 113, 113, .14);
    --warn: #fbbf24;
    --warn-soft: rgba(251, 191, 36, .16);
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 14px rgba(0, 0, 0, .3);
    --g-web: #60a5fa;
    --g-data: #a78bfa;
    --g-obs: #f472b6;
    --g-platform: #fb923c;
    --g-infra: #22d3ee;
    --g-net: #facc15;
    color-scheme: dark;
  }
}

[data-group="web"] { --g: var(--g-web); }
[data-group="data"] { --g: var(--g-data); }
[data-group="obs"] { --g: var(--g-obs); }
[data-group="platform"] { --g: var(--g-platform); }
[data-group="infra"] { --g: var(--g-infra); }
[data-group="net"] { --g: var(--g-net); }

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body.is-dragging, body.is-dragging * { cursor: grabbing !important; user-select: none; }

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { font: 700 18px var(--mono); letter-spacing: -.5px; }
.brand span { color: var(--accent); }
.theme-label { font: 600 13px var(--mono); color: var(--muted); }
.stats { display: flex; gap: 14px; margin-left: auto; font-family: var(--mono); color: var(--muted); }
.stat b { color: var(--text); font-weight: 600; }
.stat.bad b { color: var(--bad); }

.btn {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 7px 14px;
  border-radius: 8px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .4; cursor: default; border-color: var(--border); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .btn.primary { color: #062a20; } }
.btn.ghost { background: transparent; }
.btn:focus-visible, .chip:focus-visible, .zone:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- board / zones ---------- */
.board { overflow: auto; padding: 12px; }

.zones {
  display: grid;
  grid-template-columns: repeat(var(--cols, 6), minmax(0, 1fr));
  gap: 10px;
  min-height: 100%;
}

.col {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
  padding: 8px;
  background: color-mix(in srgb, var(--g) 7%, transparent);
  border-top: 3px solid var(--g);
  border-radius: var(--radius);
}
.col-head {
  padding: 0 4px 2px;
  font: 700 12px var(--mono);
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--g);
}

.zone {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  min-height: 64px;
  padding: 8px 10px 10px;
  background: var(--surface);
  border: 1.5px dashed color-mix(in srgb, var(--g) 45%, var(--border));
  border-radius: var(--radius);
  transition: border-color .15s, background-color .15s, transform .15s;
  cursor: default;
}
.zone-head { display: flex; align-items: baseline; gap: 8px; }
.zone-title { font-weight: 600; font-size: 15px; flex: 1; }
.zone-count { font: 12px var(--mono); color: var(--muted); }
.zone-hint { font-size: 12px; color: var(--muted); }
.no-hints .zone-hint { display: none; }
.zone-items { display: flex; flex-wrap: wrap; gap: 5px; margin-top: auto; }

.armed .zone { cursor: pointer; }
.armed .zone:hover, .zone.over { border-color: var(--accent); background: var(--accent-soft); border-style: solid; }
.zone.over { transform: scale(1.015); }
.zone.ok { border-color: var(--ok); background: var(--ok-soft); border-style: solid; }
.zone.bad { border-color: var(--bad); background: var(--bad-soft); border-style: solid; animation: shake .35s; }
.zone.reveal { border-color: var(--warn); background: var(--warn-soft); border-style: solid; animation: pulse 1s ease-in-out 3; }

.tile {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px 2px 3px;
  font-size: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  color: var(--text);
  font-family: inherit;
}
.tile .ico { width: 20px; height: 20px; border-radius: 50%; }
.tile .ico img { width: 13px; height: 13px; }
.tile .ico-fallback { font-size: 8px; }
.tile.missed { border-color: var(--warn); }
.tile.revealed { border: 1px dashed var(--bad); background: var(--bad-soft); }
.tile.fresh { animation: pop .35s ease-out; }

/* ---------- dock / pool ---------- */
.dock {
  display: flex;
  flex-direction: column;
  max-height: 40dvh;
  background: var(--surface);
  border-top: 1px solid var(--border);
  box-shadow: 0 -4px 14px rgba(0, 0, 0, .06);
}

.dock-head {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border);
}
.dock-actions { display: flex; flex: none; align-self: center; gap: 8px; margin: 6px 12px 6px 0; }

/* Облако карточек над полем категорий; подсказки остаются между ними. */
body.pool-top { grid-template-rows: auto auto 1fr; }
.pool-top .dock {
  grid-row: 2;
  flex-direction: column-reverse;
  border-top: 0;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 14px rgba(0, 0, 0, .06);
}
.pool-top .board { grid-row: 3; }
.pool-top .quiz { grid-row: 2 / 4; }
.pool-top .dock-head { border-bottom: 0; border-top: 1px solid var(--border); }

.feedback {
  flex: 1;
  min-height: 42px;
  padding: 10px 16px;
  color: var(--muted);
}
.feedback.ok { color: var(--text); background: var(--ok-soft); }
.feedback.bad { color: var(--text); background: var(--bad-soft); }
.feedback.info { color: var(--text); background: var(--accent-soft); }
.feedback b { font-weight: 600; }
.feedback .tag { color: var(--muted); font-size: 12px; }
.link {
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
}

/* ---------- вопросы ---------- */
.quiz { display: grid; place-items: start center; padding: 32px 16px; overflow: auto; }
.quiz-card {
  width: min(720px, 100%);
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
}
.quiz-kicker { font: 600 12px var(--mono); letter-spacing: .03em; color: var(--muted); }
.quiz-prompt { margin: 10px 0 20px; font-size: 20px; line-height: 1.35; font-weight: 500; }
.quiz-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.option {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 10px 12px;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
}
.option:hover:not(:disabled) { border-color: var(--accent); }
.option:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.option:disabled { cursor: default; color: var(--text); }
.option.right { border-color: var(--ok); background: var(--ok-soft); }
.option.wrong { border-color: var(--bad); background: var(--bad-soft); }
.option-key { font: 11px var(--mono); color: var(--muted); }
.quiz-feedback { margin-top: 16px; padding: 10px 12px; border-radius: var(--radius); }
.quiz-feedback:empty { display: none; }
.quiz-feedback.ok { background: var(--ok-soft); }
.quiz-feedback.bad { background: var(--bad-soft); }
.result-note { margin: -8px 0 12px; font-size: 13px; color: var(--warn); }

.pool {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  justify-content: center;
  gap: 8px;
  padding: 14px 16px 18px;
  overflow: auto;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 5px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font: inherit;
  font-weight: 500;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  touch-action: pan-y;
  transition: border-color .12s, box-shadow .12s, opacity .12s, transform .12s;
}
.chip:hover { border-color: var(--accent); }
.chip.selected { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); transform: translateY(-2px); }
.chip.dragging { opacity: .3; }
.chip.shake { animation: shake .35s; border-color: var(--bad); }
.chip.leaving { animation: leave .2s ease-in forwards; }

.drag-ghost {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 100;
  pointer-events: none;
  box-shadow: var(--shadow);
  border-color: var(--accent);
  transform-origin: center;
  transition: none;
}

.tip {
  position: fixed;
  z-index: 110;
  transform: translate(-50%, -100%);
  padding: 5px 10px;
  border: 1px solid var(--g);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: var(--shadow);
}
.tip::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 100%;
  margin-left: -5px;
  border: 5px solid transparent;
  border-top-color: var(--g);
}
.tip[hidden] { display: none; }

.ico {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, .08);
  overflow: hidden;
}
.ico img { width: 18px; height: 18px; display: block; pointer-events: none; }
.ico-fallback { color: #fff; font: 700 11px var(--mono); border: 0; }
.ico-none { display: none; }
.chip:has(.ico-none) { padding: 7px 13px; }
.tile:has(.ico-none) { padding: 3px 9px; }
.result-item:has(.ico-none) { grid-template-columns: minmax(0, 1fr); }
.result-item:has(.ico-none) p { grid-column: 1; }

.pool-empty { color: var(--muted); padding: 8px; }

/* ---------- dialogs ---------- */
.dialog {
  width: min(560px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}
.dialog::backdrop { background: rgba(10, 12, 16, .55); }
.dialog h1 { margin: 0 0 6px; font-size: 22px; }
.muted { color: var(--muted); margin: 0 0 16px; }
.error { color: var(--bad); margin: 8px 0 0; }

fieldset { border: 0; padding: 0; margin: 0 0 16px; }
legend { font-weight: 600; margin-bottom: 8px; padding: 0; }
.choices { display: flex; flex-wrap: wrap; gap: 6px; }
.choices label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  background: var(--surface-2);
}
.choices label[data-group]::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--g);
}
.choices input { position: absolute; opacity: 0; pointer-events: none; }
.choices label:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.choices label:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.choices .count { font: 11px var(--mono); color: var(--muted); }

.toggle { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.toggle + .toggle { margin-top: 8px; }

.mastery { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; font: 12px var(--mono); color: var(--muted); }
.mastery-bar { flex: 1; height: 8px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
#masteryFill { height: 100%; width: 0; background: var(--accent); transition: width .3s; }

.actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }
.actions .ghost:first-child { margin-right: auto; }

.result-list { display: flex; flex-direction: column; gap: 8px; max-height: 50dvh; overflow: auto; }
.result-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
}
.result-item .ico { grid-row: span 2; }
.result-item .where { font-size: 12px; color: var(--muted); }
.result-item.skipped { border-style: dashed; border-color: var(--bad); }
.result-head { margin: 12px 0 0; font-size: 13px; font-weight: 600; color: var(--muted); }
.result-item p { grid-column: 2; margin: 0; font-size: 13px; }

@keyframes shake {
  0%, 100% { translate: 0; }
  20% { translate: -5px; }
  40% { translate: 5px; }
  60% { translate: -3px; }
  80% { translate: 3px; }
}
@keyframes pulse { 50% { box-shadow: 0 0 0 4px var(--warn-soft); } }
@keyframes pop { from { scale: .6; opacity: 0; } to { scale: 1; opacity: 1; } }
@keyframes leave { to { scale: .6; opacity: 0; } }

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

@media (max-width: 1100px) {
  .zones { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
}

@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: 8px 12px; }
  .stats { gap: 10px; }
  .dock-head { flex-direction: column; }
  .dock-actions { align-self: flex-end; margin: 0 12px 8px; }
  .dock-actions .btn { padding: 5px 10px; font-size: 13px; }
  .board { padding: 12px; }
  .zones { grid-template-columns: minmax(0, 1fr); gap: 8px; min-height: 0; }
  .col { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-head { grid-column: 1 / -1; }
  .zone { padding: 8px; }
  .zone-title { font-size: 14px; }
  .dock { max-height: 45dvh; }
  .chip { padding: 4px 10px 4px 4px; font-size: 13px; }
  .quiz { padding: 12px; }
  .quiz-card { padding: 16px; }
  .quiz-prompt { font-size: 17px; }
  .quiz-options { grid-template-columns: minmax(0, 1fr); }
  .ico { width: 26px; height: 26px; }
}