/* ============ SkillLab styles ============ */
:root {
  --bg: #0b0f17;
  --bg-soft: #0f1420;
  --card: #141a28;
  --card-hover: #182036;
  --border: #232d42;
  --border-soft: #1b2436;
  --text: #e7ecf5;
  --muted: #93a1b8;
  --faint: #64748b;
  --accent: #8b5cf6;
  --accent-2: #22d3ee;
  --grad: linear-gradient(135deg, #8b5cf6 0%, #22d3ee 100%);
  --ok: #34d399;
  --ok-bg: rgba(52, 211, 153, .12);
  --err: #f87171;
  --err-bg: rgba(248, 113, 113, .12);
  --warn: #fbbf24;
  --warn-bg: rgba(251, 191, 36, .12);
  --code-bg: #0d1119;
  --radius: 14px;
  --mono: ui-monospace, "Cascadia Code", Consolas, "JetBrains Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, "Inter", Ubuntu, sans-serif;
  font-size: 15.5px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; width: 100%; max-width: 1180px; margin: 0 auto; padding: 28px 22px 60px; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============ Topbar ============ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 15, 23, .85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.topbar-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 22px;
  display: flex; align-items: center; justify-content: space-between; height: 60px;
}
.brand {
  font-size: 20px; font-weight: 800; letter-spacing: .3px; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.brand:hover { text-decoration: none; }
.brand-icon { font-size: 22px; }
.brand-accent { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.mainnav { display: flex; gap: 6px; }
.mainnav a {
  color: var(--muted); padding: 8px 14px; border-radius: 10px; font-weight: 600; font-size: 14.5px;
}
.mainnav a:hover { color: var(--text); background: var(--card); text-decoration: none; }
.mainnav a.active { color: var(--text); background: var(--card); box-shadow: inset 0 -2px 0 var(--accent); }

/* ============ Hero / Catalog ============ */
.hero {
  border: 1px solid var(--border); border-radius: 20px; padding: 36px 34px;
  background:
    radial-gradient(600px 220px at 12% 0%, rgba(139, 92, 246, .18), transparent 60%),
    radial-gradient(600px 220px at 88% 100%, rgba(34, 211, 238, .14), transparent 60%),
    var(--card);
  margin-bottom: 26px;
}
.hero h1 { margin: 0 0 10px; font-size: 30px; line-height: 1.25; }
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); margin: 0 0 18px; max-width: 760px; }
.hero-stats { display: flex; gap: 26px; flex-wrap: wrap; }
.hstat { display: flex; flex-direction: column; }
.hstat b { font-size: 22px; }
.hstat span { color: var(--faint); font-size: 13px; }

.toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin: 22px 0 16px; }
.search {
  flex: 1; min-width: 240px; max-width: 420px;
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  border-radius: 12px; padding: 10px 14px; font-size: 14.5px; outline: none;
}
.search:focus { border-color: var(--accent); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  background: var(--card); border: 1px solid var(--border); color: var(--muted);
  padding: 7px 14px; border-radius: 999px; font-size: 13.5px; cursor: pointer; font-weight: 600;
}
.chip:hover { color: var(--text); border-color: var(--accent); }
.chip.active { background: var(--grad); color: #fff; border-color: transparent; }

.tracks-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 16px;
}
.track-card {
  position: relative; display: block; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; color: var(--text);
  transition: border-color .15s, transform .15s, background .15s; overflow: hidden;
}
.track-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad); opacity: 0; transition: opacity .15s;
}
.track-card:hover { text-decoration: none; border-color: var(--accent); background: var(--card-hover); transform: translateY(-2px); }
.track-card:hover::before { opacity: 1; }
.tc-head { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.tc-icon {
  width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 24px; flex-shrink: 0; background: color-mix(in srgb, var(--tc-color) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--tc-color) 35%, transparent);
}
.tc-title { font-size: 17px; font-weight: 700; line-height: 1.3; }
.tc-subtitle { color: var(--faint); font-size: 12.5px; margin-top: 2px; }
.tc-desc { color: var(--muted); font-size: 13.5px; min-height: 40px; }
.tc-foot { display: flex; align-items: center; justify-content: space-between; margin-top: 14px; gap: 10px; }
.tc-meta { color: var(--faint); font-size: 12.5px; display: flex; gap: 12px; flex-wrap: wrap; }
.tc-progress { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted); font-weight: 600; }
.bar { height: 6px; background: var(--border-soft); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--grad); border-radius: 99px; }
.tc-bar { width: 110px; }

.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 11.5px; font-weight: 700;
  background: var(--border-soft); color: var(--muted);
}
.badge.level-Начальный { background: rgba(52,211,153,.14); color: var(--ok); }
.badge.level-Средний { background: rgba(251,191,36,.14); color: var(--warn); }
.badge.level-Продвинутый { background: rgba(248,113,113,.14); color: var(--err); }

/* ============ Track page ============ */
.breadcrumb { color: var(--faint); font-size: 13.5px; margin-bottom: 16px; display: flex; gap: 8px; flex-wrap: wrap; }
.breadcrumb a { color: var(--muted); }
.track-hero {
  border: 1px solid var(--border); border-radius: 18px; background: var(--card);
  padding: 26px 28px; margin-bottom: 22px;
}
.th-top { display: flex; gap: 18px; align-items: flex-start; flex-wrap: wrap; }
.th-icon {
  width: 64px; height: 64px; border-radius: 16px; font-size: 34px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--tc-color) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--tc-color) 35%, transparent);
}
.track-hero h1 { margin: 4px 0 6px; font-size: 26px; }
.track-hero .desc { color: var(--muted); max-width: 720px; }
.th-meta { display: flex; gap: 18px; color: var(--faint); font-size: 13.5px; margin-top: 12px; flex-wrap: wrap; }
.th-actions { margin-top: 18px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.th-progress-wrap { display: flex; align-items: center; gap: 14px; margin-top: 6px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; border-radius: 12px; cursor: pointer;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 10px 18px; font-size: 14.5px; font-weight: 700; font-family: inherit;
  transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn-primary { background: var(--grad); border: none; color: #fff; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 9px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.prereq {
  margin-top: 16px; padding: 12px 16px; border-radius: 12px; font-size: 13.5px;
  background: var(--warn-bg); color: #fcd34d; border: 1px solid rgba(251,191,36,.25);
}

.lab-list { display: flex; flex-direction: column; gap: 10px; }
.lab-row {
  display: flex; align-items: center; gap: 16px; padding: 16px 18px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); transition: border-color .15s, background .15s;
}
.lab-row:hover { text-decoration: none; border-color: var(--accent); background: var(--card-hover); }
.lab-num {
  width: 40px; height: 40px; border-radius: 12px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 15px;
  background: var(--border-soft); color: var(--muted);
}
.lab-num.exam { background: rgba(139,92,246,.16); color: var(--accent); }
.lab-row.done .lab-num { background: var(--ok-bg); color: var(--ok); }
.lab-row-main { flex: 1; min-width: 0; }
.lab-row-title { font-weight: 700; font-size: 15.5px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.lab-row-sub { color: var(--faint); font-size: 13px; margin-top: 3px; }
.lab-status { font-size: 13px; font-weight: 700; color: var(--faint); white-space: nowrap; }
.lab-status.done { color: var(--ok); }
.lab-status.inprogress { color: var(--warn); }
.badge-type {
  font-size: 11px; padding: 2px 9px; border-radius: 999px; font-weight: 700;
  background: rgba(139,92,246,.14); color: #c4b5fd;
}
.badge-type.exam { background: rgba(251,191,36,.13); color: var(--warn); }

/* ============ Lab page ============ */
.lab-hero h1 { margin: 6px 0 10px; font-size: 25px; }
.lab-hero .meta { display: flex; gap: 16px; color: var(--faint); font-size: 13.5px; flex-wrap: wrap; }
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--border); margin: 24px 0 24px; flex-wrap: wrap; }
.tab {
  padding: 11px 20px; color: var(--muted); font-weight: 700; font-size: 14.5px; cursor: pointer;
  border-radius: 12px 12px 0 0; border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tab:hover { color: var(--text); background: var(--card); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); background: var(--card); }
.tab .done-dot { color: var(--ok); margin-left: 6px; }

.goals {
  background: var(--card); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 12px; padding: 16px 20px; margin-bottom: 22px;
}
.goals h3 { margin: 0 0 8px; font-size: 14.5px; color: var(--accent-2); }
.goals ul { margin: 0; padding-left: 20px; color: var(--muted); }
.goals li { margin: 4px 0; }

.section { margin-bottom: 30px; }
.section > h2 {
  font-size: 19px; padding-bottom: 8px; border-bottom: 1px solid var(--border-soft); margin: 0 0 14px;
}

/* Markdown content */
.md h3 { font-size: 16.5px; margin: 20px 0 8px; color: #cbd5e1; }
.md p { margin: 10px 0; color: #c7d0de; }
.md ul, .md ol { margin: 10px 0; padding-left: 24px; color: #c7d0de; }
.md li { margin: 4px 0; }
.md blockquote {
  margin: 14px 0; padding: 10px 16px; border-left: 3px solid var(--accent);
  background: var(--card); border-radius: 0 10px 10px 0; color: var(--muted);
}
.md table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 14px; }
.md th, .md td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.md th { background: var(--card); color: #cbd5e1; }
.md td { color: #b9c3d3; }
.md code {
  font-family: var(--mono); font-size: 13px; background: var(--code-bg);
  border: 1px solid var(--border-soft); padding: 1.5px 6px; border-radius: 6px; color: #a5f3fc;
}
.md hr { border: none; border-top: 1px solid var(--border); margin: 18px 0; }
.md strong { color: var(--text); }

/* Code blocks */
.codeblock {
  border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin: 14px 0;
  background: var(--code-bg);
}
.codeblock-head, .term-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 7px 12px; background: #161d2c; border-bottom: 1px solid var(--border-soft);
  font-size: 12px; color: var(--faint); font-family: var(--mono);
}
.copy-btn {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  border-radius: 7px; padding: 3px 10px; font-size: 12px; cursor: pointer; font-family: inherit;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.codeblock pre, .term pre {
  margin: 0; padding: 14px 16px; overflow-x: auto; font-family: var(--mono);
  font-size: 13.5px; line-height: 1.6; color: #d7e0ee; white-space: pre;
}

/* Terminal (practice commands) */
.terminal { border: 1px solid var(--border); border-radius: 12px; overflow: hidden; margin: 12px 0; background: #0a0e15; }
.terminal pre .prompt { color: var(--ok); user-select: none; margin-right: 8px; }
.terminal pre .cmd { color: #e8edf7; }

/* Expected result */
.result-block {
  border: 1px solid rgba(52, 211, 153, .3); border-radius: 12px; overflow: hidden;
  margin: 12px 0; background: rgba(52, 211, 153, .05);
}
.result-head {
  padding: 7px 12px; font-size: 12.5px; font-weight: 700; color: var(--ok);
  background: rgba(52, 211, 153, .1); border-bottom: 1px solid rgba(52, 211, 153, .2);
}
.result-block pre {
  margin: 0; padding: 12px 16px; overflow-x: auto; font-family: var(--mono);
  font-size: 13px; line-height: 1.55; color: #b7e4d0; white-space: pre-wrap;
}

/* Practice steps */
.step {
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--card);
  margin-bottom: 14px; overflow: hidden;
}
.step.done { border-color: rgba(52, 211, 153, .4); }
.step-head { display: flex; align-items: center; gap: 14px; padding: 14px 18px; }
.step-num {
  width: 32px; height: 32px; border-radius: 10px; background: var(--border-soft); color: var(--muted);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 14px; flex-shrink: 0;
}
.step.done .step-num { background: var(--ok-bg); color: var(--ok); }
.step-title { flex: 1; font-weight: 700; font-size: 15px; }
.step-check {
  display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); font-weight: 600;
  background: transparent; border: 1px solid var(--border); border-radius: 9px; padding: 7px 13px;
  cursor: pointer; white-space: nowrap; font-family: inherit;
}
.step-check:hover { border-color: var(--ok); color: var(--text); }
.step.done .step-check { border-color: rgba(52,211,153,.4); color: var(--ok); background: var(--ok-bg); }
.step-body { padding: 0 18px 16px; }
.practice-progress { display: flex; align-items: center; gap: 14px; margin: 18px 0; }
.practice-progress .bar { flex: 1; }
.practice-progress span { font-size: 13.5px; color: var(--muted); font-weight: 700; white-space: nowrap; }

.notice {
  border-radius: 12px; padding: 13px 18px; margin: 16px 0; font-size: 14px; border: 1px solid;
}
.notice.ok { background: var(--ok-bg); border-color: rgba(52,211,153,.3); color: #a7f3d0; }
.notice.warn { background: var(--warn-bg); border-color: rgba(251,191,36,.3); color: #fde68a; }
.notice.info { background: rgba(139,92,246,.1); border-color: rgba(139,92,246,.3); color: #ddd6fe; }

/* ============ Quiz ============ */
.quiz-box { max-width: 780px; }
.quiz-meta { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.quiz-dots { display: flex; gap: 6px; }
.qdot { width: 26px; height: 6px; border-radius: 99px; background: var(--border-soft); }
.qdot.current { background: var(--accent); }
.qdot.answered { background: var(--ok); }
.qcard {
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--card); padding: 24px;
}
.qtext { font-size: 17px; font-weight: 700; margin: 0 0 18px; line-height: 1.5; }
.qopts { display: flex; flex-direction: column; gap: 10px; }
.qopt {
  text-align: left; display: flex; gap: 12px; align-items: flex-start;
  background: var(--bg-soft); border: 1px solid var(--border); color: #c7d0de;
  border-radius: 12px; padding: 13px 16px; font-size: 14.5px; cursor: pointer; font-family: inherit;
  line-height: 1.5; transition: border-color .12s;
}
.qopt:hover { border-color: var(--accent); }
.qopt .letter {
  width: 26px; height: 26px; border-radius: 8px; background: var(--border-soft); color: var(--muted);
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 13px; flex-shrink: 0;
}
.qopt.picked { border-color: var(--accent); background: rgba(139,92,246,.1); }
.qopt.picked .letter { background: var(--accent); color: #fff; }
.qopt.correct { border-color: var(--ok); background: var(--ok-bg); }
.qopt.correct .letter { background: var(--ok); color: #06281c; }
.qopt.wrong { border-color: var(--err); background: var(--err-bg); }
.qopt.wrong .letter { background: var(--err); color: #2d0606; }
.qopt:disabled { cursor: default; }
.qexplain {
  margin-top: 16px; padding: 13px 16px; border-radius: 12px; font-size: 14px; color: var(--muted);
  background: var(--bg-soft); border: 1px solid var(--border-soft);
}
.qexplain b { color: var(--text); }
.qactions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

.score-hero { text-align: center; padding: 34px 20px; border: 1px solid var(--border); border-radius: 18px; background: var(--card); }
.score-hero .big { font-size: 44px; font-weight: 900; margin: 8px 0; }
.score-hero .big.pass { color: var(--ok); }
.score-hero .big.fail { color: var(--err); }
.ring-lg { margin: 0 auto; }

.review-item {
  border: 1px solid var(--border); border-radius: 12px; padding: 14px 18px; margin-top: 10px; background: var(--card);
}
.review-item.ok { border-left: 3px solid var(--ok); }
.review-item.bad { border-left: 3px solid var(--err); }
.review-q { font-weight: 700; margin-bottom: 6px; }
.review-a { font-size: 13.5px; color: var(--muted); }
.review-a b.ok { color: var(--ok); }
.review-a b.bad { color: var(--err); }

/* ============ Progress page ============ */
.progress-hero {
  display: flex; gap: 30px; align-items: center; flex-wrap: wrap;
  border: 1px solid var(--border); border-radius: 18px; background: var(--card);
  padding: 26px 30px; margin-bottom: 22px;
}
.progress-hero h1 { margin: 0 0 6px; font-size: 24px; }
.progress-hero p { color: var(--muted); margin: 0; }
.progress-rows { display: flex; flex-direction: column; gap: 12px; }
.prow { display: flex; align-items: center; gap: 16px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 18px; }
.prow .tc-icon { width: 38px; height: 38px; font-size: 20px; border-radius: 10px; }
.prow-main { flex: 1; min-width: 120px; }
.prow-title { font-weight: 700; font-size: 14.5px; }
.prow .bar { margin-top: 7px; }
.prow-pct { font-weight: 800; font-size: 14px; width: 52px; text-align: right; color: var(--muted); }
.ring { transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--border-soft); }
.ring-val { fill: none; stroke: url(#gradStroke); stroke-linecap: round; }
.ring text { transform: rotate(90deg); transform-origin: center; }

.labnav { display: flex; justify-content: space-between; gap: 12px; margin-top: 34px; }

/* ============ Грейды ============ */
.grade-section { margin-bottom: 26px; }
.grade-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 18px; margin-bottom: 10px;
  background: linear-gradient(90deg, rgba(139, 92, 246, .12), rgba(34, 211, 238, .07));
  border: 1px solid var(--border); border-radius: 12px;
}
.grade-title { font-weight: 800; font-size: 15.5px; letter-spacing: .2px; }
.grade-sub { color: var(--faint); font-size: 13px; margin-top: 2px; }
.badge-grade {
  font-size: 11px; padding: 2px 9px; border-radius: 999px; font-weight: 700;
  background: rgba(34, 211, 238, .13); color: #67e8f9; white-space: nowrap;
}

/* ============ Панель синхронизации ============ */
.sync-panel {
  border: 1px solid var(--border); border-radius: 14px; background: var(--card);
  padding: 16px 20px; margin-bottom: 20px;
}
.sync-panel.ok { border-color: rgba(52, 211, 153, .35); background: linear-gradient(90deg, rgba(52,211,153,.07), transparent 60%), var(--card); }
.sync-title { font-weight: 800; font-size: 15.5px; }
.sync-sub { color: var(--muted); font-size: 13.5px; margin-top: 4px; }
.sync-form { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.sync-input { max-width: 220px; min-width: 160px; }
.sync-actions { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.sync-status { color: var(--faint); font-size: 12.5px; margin-top: 10px; min-height: 1em; }
.sync-status.err { color: var(--err); }
.sync-status code { font-family: var(--mono); background: var(--code-bg); padding: 1px 5px; border-radius: 5px; }

.empty { color: var(--faint); text-align: center; padding: 40px 0; }

@media (max-width: 720px) {
  main { padding: 18px 14px 40px; }
  .hero { padding: 24px 20px; }
  .th-top { flex-direction: column; }
  .lab-row { flex-wrap: wrap; }
}