/* ==========================================================
   Криптотех — оформление
   Тёмная тема по умолчанию, светлая через :root[data-theme=light]
   ========================================================== */

:root {
  --bg:          #0b0f14;
  --bg-elev:     #111820;
  --bg-elev-2:   #16202b;
  --bg-code:     #0d141c;
  --border:      #1f2c3a;
  --border-soft: #17222e;

  --text:        #dce6f0;
  --text-dim:    #93a7bc;
  --text-faint:  #61758d;

  --accent:      #f0b429;
  --link:        #4cc4d4;
  --link-hover:  #7fdce9;
  --ok:          #46c07a;
  --warn:        #e8873a;
  --bad:         #e2596b;
  --purple:      #a482e8;
  --on-accent:   #12181f;

  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px -12px rgba(0,0,0,.6);

  --font-ui:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-prose: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-mono:  "JetBrains Mono", "Cascadia Code", Consolas, "SF Mono", monospace;

  --sidebar-w: 304px;
  --radius: 10px;
}

:root[data-theme="light"] {
  --bg:          #f8f6f1;
  --bg-elev:     #ffffff;
  --bg-elev-2:   #f0ece2;
  --bg-code:     #f3f0e8;
  --border:      #ded7c9;
  --border-soft: #eae5da;

  --text:        #1c242e;
  --text-dim:    #4e5b68;
  --text-faint:  #828c97;

  --accent:      #9a6b06;
  --link:        #0d7488;
  --link-hover:  #095463;
  --ok:          #1c7f46;
  --warn:        #a9540f;
  --bad:         #a92234;
  --purple:      #5f3cae;
  --on-accent:   #fffaf0;

  --shadow: 0 1px 2px rgba(60,50,30,.08), 0 8px 24px -14px rgba(60,50,30,.25);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

/* ---------------------------- Каркас ---------------------------- */

#app { display: flex; min-height: 100vh; }

#sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  height: 100vh;
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  z-index: 40;
}

.brand {
  padding: 17px 18px 14px;
  border-bottom: 1px solid var(--border-soft);
  display: flex; align-items: center; gap: 10px;
  cursor: pointer; text-decoration: none; color: inherit;
}
.brand-mark {
  width: 34px; height: 34px; flex: 0 0 34px;
  border-radius: 9px;
  background: linear-gradient(145deg, var(--accent), var(--warn));
  color: var(--on-accent);
  display: grid; place-items: center;
  font-size: 17px;
  box-shadow: var(--shadow);
}
.brand-text b { display: block; font-size: 15px; letter-spacing: -.01em; }
.brand-text span { display: block; font-size: 11px; color: var(--text-faint); letter-spacing: .04em; text-transform: uppercase; }

.side-tools { padding: 12px 14px; border-bottom: 1px solid var(--border-soft); }

.search-box { position: relative; }
.search-box input {
  width: 100%; padding: 8px 10px 8px 30px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text);
  font-family: var(--font-ui); font-size: 13.5px;
}
.search-box input:focus { outline: none; border-color: var(--link); }
.search-box::before {
  content: "⌕"; position: absolute; left: 10px; top: 50%; transform: translateY(-54%);
  color: var(--text-faint); font-size: 16px; pointer-events: none;
}

.progress-row { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.progress-bar { flex: 1; height: 6px; background: var(--bg); border-radius: 99px; overflow: hidden; border: 1px solid var(--border-soft); }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--ok), var(--accent)); width: 0%; transition: width .35s ease; }
.progress-label { font-size: 11.5px; color: var(--text-dim); font-variant-numeric: tabular-nums; white-space: nowrap; }

#nav { flex: 1; overflow-y: auto; padding: 8px 8px 40px; scrollbar-width: thin; }
#nav::-webkit-scrollbar { width: 9px; }
#nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 9px; }

.mod { margin-bottom: 1px; }
.mod-head {
  display: flex; align-items: center; gap: 8px; width: 100%;
  padding: 8px 10px; background: none; border: none; color: var(--text);
  font-family: var(--font-ui); font-size: 13.5px; font-weight: 600;
  text-align: left; cursor: pointer; border-radius: 8px; line-height: 1.35;
}
.mod-head:hover { background: var(--bg-elev-2); }
.mod-head .chev { margin-left: auto; color: var(--text-faint); font-size: 9px; transition: transform .18s; }
.mod.open .mod-head .chev { transform: rotate(90deg); }
.mod-head .mod-ico { font-size: 15px; width: 19px; text-align: center; flex: 0 0 19px; }

.mod-lessons { display: none; padding: 2px 0 6px 12px; margin-left: 15px; border-left: 1px solid var(--border-soft); }
.mod.open .mod-lessons { display: block; }

.lesson-link {
  display: flex; align-items: flex-start; gap: 7px;
  padding: 5px 9px; border-radius: 7px;
  color: var(--text-dim); text-decoration: none;
  font-size: 12.8px; line-height: 1.42;
}
.lesson-link:hover { background: var(--bg-elev-2); color: var(--text); }
.lesson-link.active { background: var(--bg-elev-2); color: var(--accent); font-weight: 600; }
.tick {
  flex: 0 0 13px; width: 13px; height: 13px; margin-top: 3px;
  border: 1.5px solid var(--text-faint); border-radius: 4px;
  display: grid; place-items: center; font-size: 9px;
}
.lesson-link.active .tick { border-color: var(--accent); }
.lesson-link.done .tick { background: var(--ok); border-color: var(--ok); }
.lesson-link.done .tick::after { content: "✓"; color: #08120c; font-weight: 900; font-size: 9px; }

/* ---------------------------- Основная колонка ---------------------------- */

#main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

#topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 10px;
  padding: 10px 24px;
  background: color-mix(in srgb, var(--bg) 87%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.crumbs { font-size: 12.5px; color: var(--text-faint); flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.crumbs b { color: var(--text-dim); font-weight: 600; }

.icon-btn {
  background: var(--bg-elev); border: 1px solid var(--border);
  color: var(--text-dim); border-radius: 8px;
  width: 32px; height: 32px; flex: 0 0 32px;
  display: grid; place-items: center; cursor: pointer; font-size: 14px;
}
.icon-btn:hover { color: var(--text); border-color: var(--link); }

#content { padding: 34px 24px 90px; max-width: 880px; width: 100%; margin: 0 auto; }

/* ---------------------------- Типографика ---------------------------- */

.lesson-head { margin-bottom: 24px; }
.lesson-kicker { font-size: 11.5px; letter-spacing: .09em; text-transform: uppercase; color: var(--accent); font-weight: 700; margin-bottom: 8px; }
h1 { font-size: 34px; line-height: 1.18; letter-spacing: -.022em; margin: 0 0 12px; font-weight: 700; }
.lesson-meta { display: flex; gap: 14px; flex-wrap: wrap; font-size: 12.5px; color: var(--text-faint); }

.prose { font-family: var(--font-prose); font-size: 17.5px; line-height: 1.72; }
.prose h2 { font-family: var(--font-ui); font-size: 22px; font-weight: 700; letter-spacing: -.015em; margin: 42px 0 12px; line-height: 1.3; }
.prose h3 { font-family: var(--font-ui); font-size: 17px; font-weight: 700; margin: 28px 0 8px; }
.prose h4 { font-family: var(--font-ui); font-size: 13.5px; font-weight: 700; margin: 22px 0 6px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .05em; }
.prose p { margin: 0 0 15px; }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 23px; }
.prose li { margin-bottom: 7px; }
.prose li::marker { color: var(--accent); }
.prose a { color: var(--link); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--link) 40%, transparent); }
.prose a:hover { color: var(--link-hover); }
.prose strong { color: var(--text); font-weight: 700; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 32px 0; }
.prose > *:first-child { margin-top: 0; }

code {
  font-family: var(--font-mono); font-size: .84em;
  background: var(--bg-code); border: 1px solid var(--border-soft);
  padding: .1em .38em; border-radius: 5px; color: var(--accent);
}
pre {
  background: var(--bg-code); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
  overflow-x: auto; margin: 0 0 18px; font-size: 13px; line-height: 1.62;
}
pre code { background: none; border: none; padding: 0; color: var(--text-dim); font-size: 13px; white-space: pre; }
pre.diagram code { line-height: 1.35; font-size: 12.2px; }
.code-cap { font-family: var(--font-ui); font-size: 11.5px; color: var(--text-faint); margin: -12px 0 18px; }

.table-wrap { overflow-x: auto; margin: 0 0 20px; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-family: var(--font-ui); font-size: 13.5px; }
th, td { padding: 9px 13px; text-align: left; border-bottom: 1px solid var(--border-soft); vertical-align: top; }
th { background: var(--bg-elev); font-weight: 700; font-size: 11.5px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-dim); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--bg-elev); }
td code, th code { white-space: nowrap; }

.note {
  border-left: 3px solid var(--link);
  background: color-mix(in srgb, var(--link) 7%, transparent);
  padding: 13px 16px; border-radius: 0 var(--radius) var(--radius) 0;
  margin: 0 0 20px; font-family: var(--font-ui); font-size: 14.5px; line-height: 1.6;
}
.note p { margin: 0 0 9px; }
.note p:last-child { margin-bottom: 0; }
.note .note-t { display: block; font-weight: 700; font-size: 11.5px; text-transform: uppercase; letter-spacing: .05em; margin-bottom: 5px; color: var(--link); }
.note.warn { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 8%, transparent); }
.note.warn .note-t { color: var(--warn); }
.note.deep { border-color: var(--purple); background: color-mix(in srgb, var(--purple) 8%, transparent); }
.note.deep .note-t { color: var(--purple); }
.note.key { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.note.key .note-t { color: var(--accent); }
.note.y2026 { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 8%, transparent); }
.note.y2026 .note-t { color: var(--ok); }

.formula {
  font-family: var(--font-mono); font-size: 15px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; text-align: center;
  margin: 0 0 20px; color: var(--text); overflow-x: auto;
}
.formula .fn { color: var(--text-faint); font-size: 12px; display: block; margin-top: 8px; font-family: var(--font-ui); }

/* ---------------------------- Демо / тренажёры ---------------------------- */

.demo {
  border: 1px solid var(--border); background: var(--bg-elev);
  border-radius: 12px; margin: 26px 0; overflow: hidden;
  font-family: var(--font-ui); box-shadow: var(--shadow);
}
.demo-head {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; background: var(--bg-elev-2);
  border-bottom: 1px solid var(--border);
  font-size: 11.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--text-dim);
}
.demo-head::before { content: "▶"; color: var(--accent); font-size: 9px; }
.demo-head .tag {
  margin-left: auto; font-size: 10px; letter-spacing: .04em;
  padding: 2px 7px; border-radius: 99px;
  background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent);
}
.demo-head .tag.task { background: color-mix(in srgb, var(--purple) 20%, transparent); color: var(--purple); }
.demo-body { padding: 16px; font-size: 14px; }
.demo-body > p { margin: 0 0 12px; color: var(--text-dim); font-size: 13.5px; line-height: 1.55; }
.demo-body label { display: block; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint); margin-bottom: 5px; font-weight: 600; }
.demo-body input[type="text"], .demo-body input[type="number"], .demo-body textarea, .demo-body select {
  width: 100%; padding: 8px 11px; background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; color: var(--text);
  font-family: var(--font-mono); font-size: 13px;
}
.demo-body textarea { resize: vertical; min-height: 60px; line-height: 1.5; }
.demo-body input:focus, .demo-body textarea:focus, .demo-body select:focus { outline: none; border-color: var(--link); }
.demo-body input[type="range"] { width: 100%; accent-color: var(--accent); padding: 0; }
.demo-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; align-items: flex-end; }
.demo-row > * { flex: 1; min-width: 128px; }
.demo-row > .fixed { flex: 0 0 auto; min-width: 0; }
.demo-out {
  font-family: var(--font-mono); font-size: 12.5px;
  background: var(--bg-code); border: 1px solid var(--border-soft);
  border-radius: 8px; padding: 11px 13px; word-break: break-all;
  line-height: 1.6; color: var(--text-dim);
}
.demo-out + .demo-out { margin-top: 8px; }
.demo-out .hl { color: var(--accent); }
.demo-out .ok, .ok-t { color: var(--ok); }
.demo-out .bad, .bad-t { color: var(--bad); }
.demo-out .dim { color: var(--text-faint); }
.demo-out .pur { color: var(--purple); }
.demo-out .lnk { color: var(--link); }

.btn {
  background: var(--accent); color: var(--on-accent); border: none; border-radius: 8px;
  padding: 9px 16px; font-family: var(--font-ui); font-size: 13.5px; font-weight: 700;
  cursor: pointer; white-space: nowrap;
}
.btn:hover { filter: brightness(1.1); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: none; border: 1px solid var(--border); color: var(--text-dim); }
.btn.ghost:hover { border-color: var(--link); color: var(--text); }
.btn.sm { padding: 6px 11px; font-size: 12px; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); gap: 9px; }
.stat { background: var(--bg); border: 1px solid var(--border-soft); border-radius: 8px; padding: 9px 11px; }
.stat .sv { font-family: var(--font-mono); font-size: 16px; color: var(--accent); font-variant-numeric: tabular-nums; line-height: 1.3; }
.stat .sl { font-size: 10px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint); margin-top: 3px; }
.stat.good .sv { color: var(--ok); }
.stat.bad  .sv { color: var(--bad); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-family: var(--font-mono); font-size: 11.5px;
  padding: 4px 9px; border-radius: 99px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text-dim); cursor: pointer;
}
.chip:hover { border-color: var(--link); color: var(--text); }
.chip.on { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 700; }

.demo svg { max-width: 100%; height: auto; display: block; }
.bitgrid { display: flex; flex-wrap: wrap; gap: 2px; font-family: var(--font-mono); font-size: 9px; line-height: 1; }
.bitgrid i { width: 8px; height: 12px; display: block; border-radius: 2px; background: var(--border); }
.bitgrid i.d { background: var(--bad); }

/* Мини-таблица внутри демо */
.dtable { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 12px; }
.dtable th, .dtable td { padding: 5px 8px; border-bottom: 1px solid var(--border-soft); text-transform: none; letter-spacing: 0; }
.dtable th { background: transparent; color: var(--text-faint); font-size: 10.5px; text-transform: uppercase; }

/* ---------------------------- Квиз ---------------------------- */

.quiz { margin-top: 46px; border-top: 1px solid var(--border); padding-top: 26px; }
.quiz h2 { font-family: var(--font-ui); font-size: 19px; margin: 0 0 18px; }
.q { margin-bottom: 22px; }
.q-text { font-family: var(--font-ui); font-size: 15px; font-weight: 600; margin-bottom: 10px; line-height: 1.5; }
.q-opts { display: flex; flex-direction: column; gap: 7px; }
.q-opt {
  text-align: left; padding: 9px 13px; background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: 8px; color: var(--text-dim);
  font-family: var(--font-ui); font-size: 14px; cursor: pointer; line-height: 1.45;
}
.q-opt:hover { border-color: var(--link); color: var(--text); }
.q-opt.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 13%, transparent); color: var(--text); }
.q-opt.wrong { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 13%, transparent); color: var(--text); }
.q-why { margin-top: 9px; font-size: 13.5px; color: var(--text-dim); border-left: 2px solid var(--accent); padding-left: 11px; display: none; line-height: 1.55; }
.q.answered .q-why { display: block; }

/* ---------------------------- Заметки ---------------------------- */

.notes { margin-top: 34px; }
.notes h3 { font-family: var(--font-ui); font-size: 15px; margin: 0 0 9px; color: var(--text-dim); }
.notes textarea {
  width: 100%; min-height: 90px; padding: 12px 14px;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); font-family: var(--font-ui); font-size: 14.5px; line-height: 1.6; resize: vertical;
}
.notes textarea:focus { outline: none; border-color: var(--accent); }
.notes .saved { font-size: 11.5px; color: var(--ok); margin-top: 6px; height: 14px; }

/* ---------------------------- Низ урока ---------------------------- */

.lesson-foot { margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--border); }
.done-row { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.pager { display: flex; gap: 12px; }
.pager a {
  flex: 1; padding: 13px 16px; border: 1px solid var(--border); border-radius: var(--radius);
  text-decoration: none; color: var(--text); background: var(--bg-elev); font-family: var(--font-ui);
}
.pager a:hover { border-color: var(--accent); }
.pager .pl { display: block; font-size: 10.5px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-faint); margin-bottom: 3px; }
.pager .pt { font-size: 14px; font-weight: 600; line-height: 1.35; }
.pager a.next { text-align: right; }

/* ---------------------------- Главная ---------------------------- */

.hero { padding: 10px 0 6px; }
.hero h1 { font-size: 42px; margin-bottom: 14px; }
.hero .lead { font-family: var(--font-prose); font-size: 19px; color: var(--text-dim); line-height: 1.65; max-width: 64ch; }
.hero-cta { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; align-items: center; }

.home-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px,1fr)); gap: 12px; margin-top: 30px; }
.home-stats .stat { background: var(--bg-elev); }

.sec-title { font-size: 13px; text-transform: uppercase; letter-spacing: .09em; color: var(--text-faint); font-weight: 700; margin: 44px 0 14px; }

.mod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: 13px; }
.mod-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; text-decoration: none; color: var(--text);
  display: flex; flex-direction: column; gap: 7px; transition: .15s;
}
.mod-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.mod-card .mc-top { display: flex; align-items: center; gap: 9px; }
.mod-card .mc-ico { font-size: 20px; }
.mod-card .mc-num { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-faint); margin-left: auto; }
.mod-card .mc-title { font-size: 15.5px; font-weight: 700; line-height: 1.3; }
.mod-card .mc-sum { font-size: 13px; color: var(--text-dim); line-height: 1.5; flex: 1; }
.mod-card .mc-bar { height: 4px; background: var(--bg); border-radius: 99px; overflow: hidden; }
.mod-card .mc-bar i { display: block; height: 100%; background: var(--ok); border-radius: 99px; }
.mod-card .mc-meta { font-size: 11.5px; color: var(--text-faint); font-variant-numeric: tabular-nums; }

.search-results { margin-top: 6px; max-height: 320px; overflow-y: auto; }
.sr-item { display: block; padding: 7px 9px; border-radius: 7px; text-decoration: none; color: var(--text-dim); font-size: 13px; }
.sr-item:hover { background: var(--bg-elev-2); color: var(--text); }
.sr-item small { display: block; color: var(--text-faint); font-size: 11px; }
.sr-item mark { background: color-mix(in srgb, var(--accent) 30%, transparent); color: var(--text); border-radius: 3px; padding: 0 2px; }
.sr-empty { padding: 10px; color: var(--text-faint); font-size: 12.5px; }

/* ---------------------------- Глоссарий ---------------------------- */

.gloss-filter { margin-bottom: 20px; }
.gloss-item { border-bottom: 1px solid var(--border-soft); padding: 14px 0; }
.gloss-item dt { font-family: var(--font-ui); font-weight: 700; font-size: 15.5px; color: var(--accent); margin-bottom: 4px; }
.gloss-item dt small { color: var(--text-faint); font-weight: 500; font-size: 12px; margin-left: 8px; font-family: var(--font-mono); }
.gloss-item dd { margin: 0; font-family: var(--font-prose); font-size: 16.5px; color: var(--text-dim); line-height: 1.6; }

/* ---------------------------- Флеш-карточки ---------------------------- */

.modal-bg {
  position: fixed; inset: 0; background: rgba(0,0,0,.72);
  z-index: 100; display: grid; place-items: center; padding: 20px;
  backdrop-filter: blur(4px);
}
.modal {
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 16px; width: min(560px, 100%); box-shadow: var(--shadow);
  overflow: hidden;
}
.modal-head { display: flex; align-items: center; gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.modal-head b { font-size: 15px; flex: 1; }
.modal-body { padding: 22px 18px; }
.card-face {
  min-height: 160px; display: grid; place-items: center; text-align: center;
  padding: 22px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 12px; cursor: pointer; user-select: none;
}
.card-face .cf-q { font-size: 20px; font-weight: 700; line-height: 1.35; }
.card-face .cf-a { font-family: var(--font-prose); font-size: 16.5px; color: var(--text-dim); line-height: 1.6; }
.card-face .cf-hint { font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .06em; margin-top: 14px; }
.card-ctl { display: flex; gap: 10px; margin-top: 16px; }
.card-ctl .btn { flex: 1; }
.card-count { text-align: center; font-size: 12px; color: var(--text-faint); margin-top: 12px; font-variant-numeric: tabular-nums; }

/* ---------------------------- Экзамен ---------------------------- */

.exam-score { font-family: var(--font-mono); font-size: 44px; color: var(--accent); text-align: center; margin: 10px 0; }

/* ---------------------------- Мобильный ---------------------------- */

#burger { display: none; }
.scrim { display: none; }

@media (max-width: 940px) {
  #sidebar {
    position: fixed; left: 0; top: 0; bottom: 0;
    transform: translateX(-102%); transition: transform .22s ease;
    box-shadow: 0 0 40px rgba(0,0,0,.55);
  }
  body.nav-open #sidebar { transform: none; }
  body.nav-open .scrim { display: block; position: fixed; inset: 0; background: rgba(0,0,0,.55); z-index: 35; }
  #burger { display: grid; }
  #content { padding: 24px 16px 80px; }
  #topbar { padding: 10px 16px; }
  h1 { font-size: 27px; }
  .hero h1 { font-size: 30px; }
  .hero .lead { font-size: 17px; }
  .prose { font-size: 16.5px; }
  .prose h2 { font-size: 20px; }
  .pager { flex-direction: column; }
}

@media print {
  #sidebar, #topbar, .quiz, .lesson-foot, .demo, .notes { display: none; }
  body { background: #fff; color: #000; }
  #content { max-width: none; }
}