/* AI-локатор на Playwright — стили курса */
:root {
  --bg: #f3f5f4;
  --surface: #ffffff;
  --surface-2: #e9eeec;
  --ink: #17201d;
  --ink-2: #4a5752;
  --ink-3: #7b8782;
  --line: #d6dedb;
  --accent: #2c6b58;
  --accent-ink: #ffffff;
  --accent-soft: #dcebe5;
  --pass: #2c7a4b;
  --pass-soft: #e0f1e6;
  --flaky: #9a6a0b;
  --flaky-soft: #f8ecd2;
  --fail: #b3261e;
  --fail-soft: #fbe3e0;
  --code-bg: #1d2523;
  --code-ink: #e3ebe8;
  --code-kw: #8fd3b6;
  --code-str: #f0c987;
  --code-com: #7f928b;
  --code-num: #f2a38f;
  --code-fn: #9cc7ff;
  --radius: 10px;
  --f-display: "Unbounded", "Segoe UI", system-ui, sans-serif;
  --f-body: "Onest", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111615;
    --surface: #182120;
    --surface-2: #1f2a28;
    --ink: #e4ebe8;
    --ink-2: #aab8b3;
    --ink-3: #7a8a84;
    --line: #2b3835;
    --accent: #6cc3a4;
    --accent-ink: #0d1614;
    --accent-soft: #1d3a31;
    --pass: #6fcf97;
    --pass-soft: #173226;
    --flaky: #e8b95a;
    --flaky-soft: #362a12;
    --fail: #f28b82;
    --fail-soft: #3a1c1a;
    --code-bg: #0c1110;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111615;
  --surface: #182120;
  --surface-2: #1f2a28;
  --ink: #e4ebe8;
  --ink-2: #aab8b3;
  --ink-3: #7a8a84;
  --line: #2b3835;
  --accent: #6cc3a4;
  --accent-ink: #0d1614;
  --accent-soft: #1d3a31;
  --pass: #6fcf97;
  --pass-soft: #173226;
  --flaky: #e8b95a;
  --flaky-soft: #362a12;
  --fail: #f28b82;
  --fail-soft: #3a1c1a;
  --code-bg: #0c1110;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
}
a { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}
@media (max-width: 860px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- боковая панель: как дерево тестов в UI mode ---------- */
.side {
  border-right: 1px solid var(--line);
  background: var(--surface);
  padding: 20px 14px;
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  height: 100vh;
  overflow-y: auto;
}
@media (max-width: 860px) {
  .side { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 14px 16px; }
  .side .tree { display: none; }
  .side.open .tree { display: block; }
}
.brand { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; padding: 0 6px 14px; }
.brand a { text-decoration: none; color: var(--ink); }
.brand .name { font-family: var(--f-display); font-weight: 600; font-size: 15px; letter-spacing: 0.01em; line-height: 1.25; }
.brand .sub { display: block; font-family: var(--f-mono); font-size: 11px; color: var(--ink-3); margin-top: 4px; }
.menu-btn { display: none; }
@media (max-width: 860px) { .menu-btn { display: inline-flex; } }

.tree .module { margin-top: 14px; }
.tree .module-title { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-3); padding: 0 6px 6px; }
.tree a {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 8px;
  align-items: start;
  padding: 6px 8px;
  border-radius: 6px;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.35;
}
.tree a:hover { background: var(--surface-2); color: var(--ink); }
.tree a.current { background: var(--accent-soft); color: var(--ink); }
.tree a.draft { color: var(--ink-3); }
.tree .num { font-family: var(--f-mono); font-size: 12px; color: var(--ink-3); margin-right: 4px; }

.mark { font-family: var(--f-mono); font-size: 13px; line-height: 1.35; text-align: center; }
.mark.passed { color: var(--pass); }
.mark.flaky { color: var(--flaky); }
.mark.failed { color: var(--fail); }
.mark.todo { color: var(--ink-3); }

/* ---------- основная колонка ---------- */
.main { padding-block: 32px 80px; padding-inline: 32px; min-width: 0; }
@media (max-width: 600px) { .main { padding-inline: 16px; padding-block: 20px 60px; } }
.col { max-width: 760px; margin: 0 auto; }

.eyebrow { font-family: var(--f-mono); font-size: 12px; color: var(--ink-3); letter-spacing: 0.04em; }
h1 {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1.15;
  margin: 6px 0 12px;
  text-wrap: balance;
}
h2 {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 20px;
  line-height: 1.25;
  margin: 0 0 12px;
  text-wrap: balance;
}
h3 { font-size: 17px; margin: 20px 0 8px; }
p { margin: 0 0 12px; }
ul, ol { margin: 0 0 12px; padding-left: 22px; }
li { margin-bottom: 4px; }
.lead { font-size: 18px; color: var(--ink-2); }

.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 26px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--f-mono); font-size: 12px;
  padding: 3px 9px; border-radius: 999px;
  background: var(--surface-2); color: var(--ink-2);
}
.chip.passed { background: var(--pass-soft); color: var(--pass); }
.chip.flaky { background: var(--flaky-soft); color: var(--flaky); }
.chip.failed { background: var(--fail-soft); color: var(--fail); }

/* шаги урока */
.steps { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 30px; padding: 0; list-style: none; }
.steps a {
  font-size: 13px; text-decoration: none; color: var(--ink-2);
  border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px;
}
.steps a:hover { border-color: var(--accent); color: var(--accent); }

.section { padding: 26px 0; border-top: 1px solid var(--line); scroll-margin-top: 16px; }
.section:first-of-type { border-top: 0; }
.section-kicker { font-family: var(--f-mono); font-size: 12px; color: var(--accent); margin-bottom: 4px; }

code {
  font-family: var(--f-mono);
  font-size: 0.88em;
  background: var(--surface-2);
  padding: 1px 5px;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.55;
  margin: 0 0 14px;
}
pre code { background: none; padding: 0; font-size: inherit; color: inherit; }
.code-wrap { position: relative; }
.code-file {
  font-family: var(--f-mono); font-size: 12px; color: var(--ink-3);
  margin: 0 0 4px;
}
.copy-btn {
  position: absolute; top: 8px; right: 8px;
  font-size: 12px; padding: 3px 8px;
  background: rgba(255,255,255,0.08); color: var(--code-ink);
  border: 1px solid rgba(255,255,255,0.15); border-radius: 6px; cursor: pointer;
  font-family: var(--f-body);
}
.copy-btn:hover { background: rgba(255,255,255,0.16); }
.hljs-keyword, .hljs-built_in, .hljs-literal { color: var(--code-kw); }
.hljs-string, .hljs-attr { color: var(--code-str); }
.hljs-comment { color: var(--code-com); font-style: italic; }
.hljs-number { color: var(--code-num); }
.hljs-title, .hljs-title.function_ { color: var(--code-fn); }
.hljs-meta { color: var(--code-com); }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  margin: 0 0 14px;
}
.callout.warn { border-color: var(--flaky); background: var(--flaky-soft); }

table { border-collapse: collapse; width: 100%; font-size: 14px; }
.table-wrap { overflow-x: auto; margin: 0 0 14px; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--ink-2); font-size: 13px; }

/* ---------- задания ---------- */
.task {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin: 0 0 16px;
}
.task.passed { border-color: color-mix(in srgb, var(--pass) 45%, var(--line)); }
.task-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.task-title { font-weight: 600; font-size: 16px; }
.task-prompt { color: var(--ink); }
.task label { display: block; font-size: 13px; color: var(--ink-2); margin: 10px 0 6px; }
.task textarea {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  line-height: 1.5;
}
.task textarea.mono { font-family: var(--f-mono); font-size: 13px; min-height: 180px; tab-size: 2; }
.task textarea:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }

.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 10px; }
.btn {
  font: inherit; font-size: 14px; font-weight: 500;
  padding: 8px 16px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
}
.btn:hover { border-color: var(--ink-3); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.07); }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn.small { font-size: 13px; padding: 5px 10px; }
.btn.ghost { background: transparent; }
.attempts { font-family: var(--f-mono); font-size: 12px; color: var(--ink-3); }

.hint-list { margin-top: 10px; }
.hint-list details { font-size: 14px; margin-bottom: 6px; }
.hint-list summary { cursor: pointer; color: var(--ink-2); }

.feedback {
  margin-top: 14px;
  border-radius: 8px;
  padding: 12px 14px;
  background: var(--surface-2);
  font-size: 15px;
}
.feedback.passed { background: var(--pass-soft); }
.feedback.flaky { background: var(--flaky-soft); }
.feedback.failed { background: var(--fail-soft); }
.feedback .verdict { font-family: var(--f-mono); font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.feedback.passed .verdict { color: var(--pass); }
.feedback.flaky .verdict { color: var(--flaky); }
.feedback.failed .verdict { color: var(--fail); }
.feedback ul { list-style: none; padding: 0; margin: 8px 0; }
.feedback li { display: grid; grid-template-columns: 20px 1fr; gap: 6px; }
.feedback li .k { font-family: var(--f-mono); }
.feedback .next { margin-top: 8px; font-weight: 500; }
.feedback .thinking { color: var(--ink-2); font-style: italic; }
.feedback pre { margin-top: 8px; }

.history { margin-top: 10px; font-size: 13px; }
.history summary { cursor: pointer; color: var(--ink-3); }
.history .old { border-top: 1px dashed var(--line); padding-top: 8px; margin-top: 8px; color: var(--ink-2); }

.reference { margin-top: 12px; }
.reference summary { cursor: pointer; font-size: 14px; color: var(--accent); }

.mode-note {
  font-size: 13px; color: var(--ink-2);
  background: var(--surface); border: 1px dashed var(--line);
  border-radius: 8px; padding: 10px 12px; margin: 0 0 20px;
}

/* ---------- главная ---------- */
.hero { padding: 10px 0 24px; }
.progress-bar { height: 8px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin: 10px 0 6px; }
.progress-bar span { display: block; height: 100%; background: var(--accent); }
.lesson-grid { display: grid; gap: 10px; margin: 0 0 24px; }
.lesson-card {
  display: grid; grid-template-columns: 48px minmax(0,1fr) auto; gap: 12px; align-items: center;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); text-decoration: none; color: var(--ink);
}
.lesson-card:hover { border-color: var(--accent); }
.lesson-card .n { font-family: var(--f-display); font-size: 20px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.lesson-card .t { font-weight: 500; line-height: 1.35; }
.lesson-card .d { font-size: 13px; color: var(--ink-3); }
@media (max-width: 480px) {
  .lesson-card { grid-template-columns: 36px minmax(0,1fr); }
  .lesson-card .chip { grid-column: 2; justify-self: start; }
}

.pager { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--line); }
.pager a { text-decoration: none; font-size: 14px; }

.toast {
  position: fixed; left: 50%; bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  background: var(--ink); color: var(--bg);
  padding: 8px 14px; border-radius: 8px; font-size: 14px;
}

@media (prefers-reduced-motion: no-preference) {
  .feedback { animation: fade 180ms ease-out; }
  @keyframes fade { from { opacity: 0.4; transform: translateY(3px); } to { opacity: 1; transform: none; } }
}

/* ---------- вопросы наставнику ---------- */
.ask label { display: block; font-size: 13px; color: var(--ink-2); margin: 12px 0 6px; }
.ask textarea {
  width: 100%; min-height: 96px; resize: vertical;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--surface); color: var(--ink); font: inherit; line-height: 1.5;
}
.ask textarea:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.qa-thread { display: grid; gap: 10px; }
.qa-thread:empty { display: none; }
.qa-msg { border-radius: 10px; padding: 10px 14px; font-size: 15px; max-width: 100%; overflow-wrap: anywhere; }
.qa-msg.me { background: var(--accent-soft); justify-self: end; max-width: min(100%, 560px); }
.qa-msg.bot { background: var(--surface); border: 1px solid var(--line); }
.qa-who { font-family: var(--f-mono); font-size: 11px; color: var(--ink-3); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.06em; }
.qa-msg pre { margin: 8px 0 0; }
.qa-msg .thinking { color: var(--ink-2); font-style: italic; }

.code-wrap pre { padding-top: 38px; }

/* ---------- настройки проверки ---------- */
.ai-settings { margin-top: 18px; padding: 12px 8px 0; border-top: 1px solid var(--line); font-size: 13px; color: var(--ink-2); }
.ai-settings summary { cursor: pointer; }
.ai-settings summary strong { color: var(--ink); font-weight: 500; }
.ai-settings p { margin: 8px 0; line-height: 1.45; }
.ai-settings label { display: block; margin: 8px 0 4px; font-size: 12px; color: var(--ink-3); }
.ai-settings input, .ai-settings select {
  width: 100%; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg); color: var(--ink); font: inherit; font-size: 13px;
}
.ai-settings input { font-family: var(--f-mono); }
@media (max-width: 860px) {
  .side .ai-settings { display: none; }
  .side.open .ai-settings { display: block; }
}