/* =========================================================================
   Python-тренажёр — оформление.
   Две темы (светлая/тёмная), адаптив под телефон, печать: 1 задача = 1 лист.
   ========================================================================= */

:root {
  --bg: #f2f5fa;
  --panel: #ffffff;
  --panel2: #f5f7fc;
  --ink: #131a26;
  --muted: #5f6b83;
  --line: #e0e6f1;
  --accent: #3776ab;
  --accent-soft: rgba(55, 118, 171, .12);
  --accent2: #f0b429;
  --good: #22c55e;
  --bad: #ef4444;
  --code-bg: #10151f;
  --code-ink: #e7edf5;
  --shadow: 0 10px 30px rgba(19, 26, 38, .07);
}

html[data-theme="dark"] {
  --bg: #0d1117;
  --panel: #161b25;
  --panel2: #1c2230;
  --ink: #e7edf5;
  --muted: #99a4ba;
  --line: #29313f;
  --accent: #5aa9e6;
  --accent-soft: rgba(90, 169, 230, .16);
  --accent2: #ffd43b;
  --good: #34d399;
  --bad: #f87171;
  --code-bg: #0b0f16;
  --code-ink: #e7edf5;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

code, pre, .mono { font-family: ui-monospace, "Cascadia Mono", Consolas, "Courier New", monospace; }

.app {
  display: grid;
  grid-template-columns: 276px minmax(0, 1fr);
  min-height: 100vh;
}

/* ------------------------------- боковая панель ------------------------- */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-right: 1px solid var(--line);
}

.brand { display: flex; gap: 10px; align-items: center; padding: 16px 16px 12px; }
.brand .logo { font-size: 26px; line-height: 1; }
.brand b { display: block; font-size: 15px; }
.brand small { display: block; color: var(--muted); font-size: 11.5px; }

.sidebar-nav { flex: 1; overflow-y: auto; padding: 4px 10px 14px; }

.topic { margin-bottom: 14px; }
.topic-head {
  display: flex; align-items: center; gap: 7px;
  padding: 4px 6px 6px; font-size: 12.5px; font-weight: 600; color: var(--muted);
}
.topic-head .t-name { flex: 1; }
.t-count { font-size: 11px; background: var(--panel2); border-radius: 999px; padding: 1px 8px; }
.t-count.full { background: rgba(34, 197, 94, .16); color: #16a34a; }

.chips { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 6px; padding: 0 6px; }
.tchip {
  position: relative; height: 38px; border-radius: 10px; cursor: pointer;
  border: 1.5px solid var(--line); background: var(--panel2); color: var(--ink);
  font-size: 13.5px; font-weight: 600; font-family: inherit;
}
.tchip:hover { border-color: var(--accent); }
.tchip.done { border-color: var(--good); background: rgba(34, 197, 94, .13); color: #15803d; }
html[data-theme="dark"] .tchip.done { color: #6ee7b7; }
.tchip.cur { outline: 2px solid var(--accent); outline-offset: 1px; }
.tchip i { position: absolute; right: 3px; bottom: 1px; font-style: normal; font-size: 8.5px; color: var(--accent2); }

.sidebar-foot {
  padding: 10px 16px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 8px;
  color: var(--muted); font-size: 11px;
}

/* ---------------------------------- основа ------------------------------ */
.main { padding: 0 22px 70px; min-width: 0; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 12px 0; margin-bottom: 16px;
  background: var(--bg); border-bottom: 1px solid var(--line);
}
.progress-wrap { flex: 1; min-width: 170px; display: flex; align-items: center; gap: 10px; }
.progress { flex: 1; height: 8px; background: var(--panel2); border-radius: 999px; overflow: hidden; }
.progress i { display: block; height: 100%; width: 0; border-radius: 999px; background: linear-gradient(90deg, var(--accent), #2ec4b6); transition: width .3s; }
.progress-txt { font-size: 12.5px; color: var(--muted); white-space: nowrap; }
.tb-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.xp { font-size: 13px; background: var(--panel2); border-radius: 999px; padding: 5px 12px; white-space: nowrap; }

/* --------------------------------- кнопки ------------------------------- */
.btn {
  border: 1.5px solid var(--line); background: var(--panel); color: var(--ink);
  border-radius: 10px; padding: 9px 16px; font: 600 14.5px/1.2 inherit; cursor: pointer;
  transition: transform .08s, border-color .15s, background .15s;
}
.btn:hover:not(:disabled) { transform: translateY(-1px); border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.ghost { background: transparent; color: var(--muted); }
.btn.small { padding: 6px 10px; font-size: 12.5px; border-radius: 9px; }
.btn:disabled { opacity: .45; cursor: default; }

/* ---------------------------------- лист -------------------------------- */
.sheet {
  max-width: 880px; margin: 0 auto;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 18px; box-shadow: var(--shadow);
  padding: 22px 24px 24px;
}
.sheet-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.chip { background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 4px 11px; font-size: 12.5px; font-weight: 600; }
.sheet-head .num { color: var(--muted); font-size: 12.5px; }
.sheet-head .level { margin-left: auto; color: var(--accent2); font-size: 12px; letter-spacing: 2px; }

.sheet-title { margin: 2px 0 10px; font-size: 21px; line-height: 1.25; }

.topic-intro {
  background: var(--panel2); border-left: 4px solid var(--accent);
  border-radius: 10px; padding: 12px 14px; margin-bottom: 14px;
  font-size: 14px; color: var(--muted);
}
.prompt { font-size: 15.5px; margin-bottom: 14px; }
.prompt code, .topic-intro code, .opt code, .mrow code, .hint-note code {
  background: rgba(127, 127, 127, .16); border-radius: 6px; padding: 1px 6px;
  font-size: 13.5px; font-family: ui-monospace, Consolas, monospace;
}
.hint-note { font-size: 12.5px; color: var(--muted); margin-bottom: 8px; }

/* ---------------------------------- код --------------------------------- */
.code-wrap { background: var(--code-bg); border-radius: 12px; padding: 14px 16px; overflow-x: auto; }
pre.code { margin: 0; color: var(--code-ink); font-size: 14.5px; line-height: 1.75; white-space: pre; }
.tk-str { color: #98c379; }
.tk-kw  { color: #c678dd; }
.tk-num { color: #d19a66; }
.tk-com { color: #6b7684; font-style: italic; }
.tk-bi  { color: #61afef; }

/* пропуски для ввода */
.blank { display: inline-block; min-width: 22px; border-bottom: 2px dashed rgba(255, 255, 255, .35); }
.blank-input {
  font: inherit; color: #fff; text-align: center;
  background: rgba(255, 255, 255, .09); border: 1.5px solid rgba(255, 255, 255, .28);
  border-radius: 8px; padding: 1px 7px; margin: 0 2px; outline: none;
}
.blank-input::placeholder { color: rgba(255, 255, 255, .35); }
.blank-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(55, 118, 171, .35); }
.blank-input.good { border-color: var(--good); background: rgba(34, 197, 94, .18); }
.blank-input.bad { border-color: var(--bad); background: rgba(239, 68, 68, .18); }

/* ------------------------------ вариант ответа --------------------------- */
.opts { display: grid; gap: 8px; }
.opt {
  display: flex; align-items: center; gap: 11px; text-align: left; width: 100%;
  background: var(--panel2); border: 1.5px solid var(--line); border-radius: 12px;
  padding: 11px 14px; color: var(--ink); font: 15px/1.4 inherit; cursor: pointer;
}
.opt:hover { border-color: var(--accent); }
.opt .mk {
  width: 21px; height: 21px; flex: 0 0 auto; border-radius: 6px;
  border: 2px solid var(--line); display: grid; place-items: center;
  font-size: 13px; line-height: 1; color: #fff;
}
.opt.multi .mk { border-radius: 50%; }
.opt .mk::after { content: "✓"; opacity: 0; }
.opt.picked { border-color: var(--accent); background: var(--accent-soft); }
.opt.picked .mk { background: var(--accent); border-color: var(--accent); }
.opt.picked .mk::after { opacity: 1; }
.opt.good { border-color: var(--good); background: rgba(34, 197, 94, .13); }
.opt.good .mk { background: var(--good); border-color: var(--good); }
.opt.good .mk::after { opacity: 1; }
.opt.bad { border-color: var(--bad); background: rgba(239, 68, 68, .12); }
.opt.bad .mk { background: var(--bad); border-color: var(--bad); }
.opt.bad .mk::after { content: "✕"; opacity: 1; }
.opt.locked { cursor: default; }
.opt.locked:hover { border-color: inherit; }

/* ------------------------------ ввод ответа ----------------------------- */
.answer-row { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.answer-label { font-size: 14px; color: var(--muted); }
.answer-input {
  flex: 1; min-width: 0; font: 14.5px ui-monospace, Consolas, monospace;
  background: var(--panel2); border: 1.5px solid var(--line); color: var(--ink);
  border-radius: 10px; padding: 9px 12px; outline: none;
}
.answer-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.answer-input.good { border-color: var(--good); background: rgba(34, 197, 94, .12); }
.answer-input.bad { border-color: var(--bad); background: rgba(239, 68, 68, .12); }

/* --------------------------- перетаскивание деталей --------------------- */
.slot {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 88px; height: 27px; margin: 0 3px; padding: 0 6px;
  border: 2px dashed rgba(255, 255, 255, .4); border-radius: 8px; vertical-align: middle;
}
.slot.over { border-color: var(--accent2); background: rgba(240, 180, 41, .15); }
.slot.filled { border-style: solid; border-color: transparent; }
.slot.good { border-color: var(--good); border-style: solid; }
.slot.bad { border-color: var(--bad); border-style: solid; }

.pool-bar { margin-top: 14px; }
.pool-label { display: block; font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.pool {
  display: flex; flex-wrap: wrap; gap: 8px; min-height: 48px; padding: 10px;
  background: var(--panel2); border: 1.5px dashed var(--line); border-radius: 12px;
}
.pool.over { border-color: var(--accent2); }
.token, .item {
  background: #22304a; color: #e7edf5; border: 1px solid #3b4d70;
  border-radius: 999px; padding: 4px 13px; font: 13.5px ui-monospace, Consolas, monospace;
  cursor: grab; user-select: none;
}
.token.sel, .item.sel { outline: 2px solid var(--accent2); outline-offset: 1px; }
.token.dragging, .item.dragging { opacity: .45; }
.slot .token { background: #2c3d5e; }
.item.good { border-color: var(--good); }
.item.bad { border-color: var(--bad); }

/* ------------------------------- цепочка -------------------------------- */
.reorder { display: grid; gap: 8px; }
.rline {
  display: flex; align-items: center; gap: 10px;
  background: var(--code-bg); border: 1.5px solid transparent;
  border-radius: 10px; padding: 6px 10px;
}
.rline.over { border-color: var(--accent2); }
.rline.good { border-color: var(--good); }
.rline.bad { border-color: var(--bad); }
.rhandle { color: #5b6478; cursor: grab; font-size: 14px; }
.rpos { width: 20px; text-align: center; font-size: 11.5px; color: #8b95a7; }
.rtext { flex: 1; margin: 0; font-size: 13.5px; line-height: 1.6; color: var(--code-ink); white-space: pre; overflow-x: auto; }
.rmove {
  width: 26px; height: 24px; flex: 0 0 auto; cursor: pointer;
  background: rgba(255, 255, 255, .08); color: #cfd8e6;
  border: 1px solid rgba(255, 255, 255, .16); border-radius: 6px; font-size: 10px;
}
.rmove:disabled { opacity: .3; cursor: default; }

/* ------------------------------- корзины -------------------------------- */
.buckets { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; }
.bucket { background: var(--panel2); border: 1.5px dashed var(--line); border-radius: 14px; padding: 10px; }
.bucket-head { font-size: 12.5px; font-weight: 600; color: var(--muted); margin-bottom: 8px; }
.bucket-zone { display: flex; flex-wrap: wrap; gap: 8px; min-height: 58px; align-content: flex-start; }
.bucket-zone.over { outline: 2px dashed var(--accent2); outline-offset: 2px; border-radius: 8px; }

/* ---------------------------- сопоставление ----------------------------- */
.match { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.mcol { display: grid; gap: 8px; align-content: start; }
.mcol-head { font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.mrow {
  display: flex; align-items: center; gap: 10px; justify-content: space-between;
  background: var(--panel2); border: 1.5px solid var(--line); border-radius: 10px;
  padding: 10px 12px; cursor: pointer; color: var(--ink); font: inherit; text-align: left;
}
.mrow:hover { border-color: var(--accent); }
.mrow.sel { border-color: var(--accent); background: var(--accent-soft); }
.mrow.paired { border-color: var(--accent); }
.mrow.good { border-color: var(--good); background: rgba(34, 197, 94, .13); }
.mrow.bad { border-color: var(--bad); background: rgba(239, 68, 68, .12); }
.mrow .mtxt { font-size: 14px; }
.badge {
  width: 24px; height: 24px; flex: 0 0 auto; border-radius: 50%;
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
  background: var(--accent); color: #fff;
}
.badge:empty { background: transparent; border: 2px dashed var(--line); }

/* ------------------------- отклик, разбор, оценка ----------------------- */
.feedback {
  margin-top: 14px; border-radius: 12px; padding: 12px 14px;
  font-size: 14.5px; border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}
.feedback.ok { border-color: var(--good); background: rgba(34, 197, 94, .12); }
.feedback.bad { border-color: var(--bad); background: rgba(239, 68, 68, .11); }
.feedback.hint { border-color: var(--accent2); background: rgba(240, 180, 41, .14); }
.feedback.warn { border-color: var(--accent); background: var(--accent-soft); }

.stars { margin-top: 10px; font-size: 14px; }
.explain { margin-top: 12px; background: var(--panel2); border-radius: 12px; padding: 14px; font-size: 14.5px; }

.actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 18px; }

.pager { display: flex; align-items: center; justify-content: space-between; gap: 12px; max-width: 880px; margin: 22px auto 0; }
.pager-info { font-size: 12.5px; color: var(--muted); }

/* -------------------------------- бургер -------------------------------- */
.burger {
  display: none; position: fixed; right: 14px; bottom: 14px; z-index: 60;
  width: 52px; height: 52px; border-radius: 50%; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  font-size: 22px; box-shadow: var(--shadow);
}

/* -------------------------------- адаптив ------------------------------- */
@media (max-width: 900px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0; width: 280px;
    transform: translateX(-102%); transition: transform .2s ease; z-index: 50;
    box-shadow: var(--shadow);
  }
  .app.nav-open .sidebar { transform: none; }
  .main { padding: 0 14px 80px; }
  .burger { display: block; }
  .sheet { padding: 18px 16px 20px; border-radius: 14px; }
  .sheet-title { font-size: 19px; }
  .match { grid-template-columns: 1fr; }
  .sheet-head .level { margin-left: 0; }
}

/* --------------------------- печать: 1 задача = 1 лист ------------------ */
#print-root { display: none; }

@media print {
  @page { margin: 12mm; }
  /* печатаем всегда в светлых цветах, даже если включена тёмная тема */
  :root, html[data-theme="dark"] {
    --bg: #fff; --panel: #fff; --panel2: #fff; --ink: #111; --muted: #444;
    --line: #ccc; --accent: #1f5080; --accent-soft: #eef3f8;
    --code-bg: #f6f8fa; --code-ink: #111; --shadow: none;
  }
  body { background: #fff; }
  .app, .burger, .topbar, .pager { display: none !important; }
  #print-root { display: block !important; }

  .sheet {
    background: #fff; color: #111;
    max-width: none; margin: 0; border: 0; box-shadow: none;
    padding: 0 0 6mm; border-radius: 0;
    break-after: page; page-break-after: always;
  }
  .sheet:last-child { break-after: auto; page-break-after: auto; }
  .sheet-title { font-size: 16pt; }
  .prompt { font-size: 11pt; }
  .code-wrap { border: 1px solid #ccc; background: #f6f8fa; overflow: visible; }
  pre.code, .rtext { color: #111; font-size: 10.5pt; white-space: pre-wrap; }
  .tk-str, .tk-kw, .tk-num, .tk-bi { color: #111; }
  .tk-com { color: #666; }
  .blank { border-bottom-color: #999; }
  .blank-input, .answer-input { background: #fff; color: #111; border: 1px solid #999; }
  .rline { background: #f6f8fa; border: 1px solid #ddd; }
  .rmove, .rhandle { display: none; }
  .rpos { color: #555; }
  .pool { border-style: solid; border-color: #ccc; background: #fff; }
  .token, .item { background: #eef2f8; color: #111; border: 1px solid #bbb; }
  .answers-key {
    margin-top: 8mm; padding-top: 3mm; border-top: 1px dashed #999;
    font-size: 9.5pt; color: #333;
  }
  .topic-intro, .explain, .feedback, .stars, .actions { display: none !important; }
}