/* ============ Токены и темы ============ */
:root {
  --green: #58cc02; --green-dark: #46a302;
  --blue: #1cb0f6; --blue-dark: #1899d6;
  --red: #ff4b4b; --red-dark: #ea2b2b;
  --gold: #ffc800; --gold-dark: #e5a500;
  --orange: #ff9600; --purple: #ce82ff; --pink: #ff86d0;

  --bg: #ffffff; --bg-soft: #f7f7f7; --card: #ffffff;
  --text: #3c3c3c; --muted: #777777; --line: #e5e5e5; --line-strong: #d0d0d0;
  --locked: #e5e5e5; --locked-dark: #cfcfcf;
  --good-bg: #d7ffb8; --good-text: #58a700; --bad-bg: #ffdfe0; --bad-text: #ea2b2b;
  --code-bg: #f6f8fa; --code-text: #24292f;
  --hl-kw: #cf222e; --hl-str: #0a3069; --hl-num: #0550ae; --hl-com: #6e7781; --hl-fn: #8250df; --hl-bi: #953800;
  --shadow: 0 2px 0 var(--line);
  --radius: 16px;
  --font: "Nunito", ui-rounded, "SF Pro Rounded", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
[data-theme="dark"] {
  --bg: #131f24; --bg-soft: #1a2a31; --card: #16252c;
  --text: #f1f7fb; --muted: #8fa3ad; --line: #37464f; --line-strong: #4b5c66;
  --locked: #37464f; --locked-dark: #28363d;
  --good-bg: #1f3a14; --good-text: #79d634; --bad-bg: #3d1d20; --bad-text: #ff7878;
  --code-bg: #0d1117; --code-text: #e6edf3;
  --hl-kw: #ff7b72; --hl-str: #a5d6ff; --hl-num: #79c0ff; --hl-com: #8b949e; --hl-fn: #d2a8ff; --hl-bi: #ffa657;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 16px; }
body { -webkit-font-smoothing: antialiased; }
.shell { padding-left: env(safe-area-inset-left); padding-right: env(safe-area-inset-right); }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
[hidden] { display: none !important; }
h1, h2, h3 { margin: 0 0 .5em; font-weight: 800; }
code, pre, textarea.code { font-family: var(--mono); }

/* ============ Каркас ============ */
.shell { display: grid; grid-template-columns: 240px minmax(0, 1fr) 330px; min-height: 100vh; }
.sidebar { position: sticky; top: 0; height: 100vh; padding: 20px 14px; border-right: 2px solid var(--line); display: flex; flex-direction: column; gap: 6px; }
.logo { font-size: 28px; font-weight: 900; color: var(--green); padding: 4px 14px 22px; letter-spacing: -.5px; }
.nav-link { display: flex; align-items: center; gap: 14px; padding: 10px 14px; border-radius: 12px; border: 2px solid transparent; font-weight: 800; text-transform: uppercase; font-size: 14px; letter-spacing: .6px; color: var(--muted); position: relative; }
.nav-link:hover { background: var(--bg-soft); }
.nav-link.active { color: var(--blue); background: color-mix(in srgb, var(--blue) 12%, transparent); border-color: color-mix(in srgb, var(--blue) 50%, transparent); }
.ni { font-size: 24px; width: 32px; text-align: center; }
.badge { margin-left: auto; background: var(--red); color: #fff; border-radius: 99px; font-size: 12px; padding: 2px 8px; }
main { padding: 24px 40px 80px; max-width: 760px; width: 100%; margin: 0 auto; }
.rail { position: sticky; top: 0; height: 100vh; overflow: auto; padding: 24px 24px 24px 0; display: flex; flex-direction: column; gap: 18px; }
body.focus .sidebar, body.focus .rail { display: none; }
body.focus .shell { grid-template-columns: minmax(0, 1fr); }
body.focus main { max-width: 900px; padding-top: 16px; }

@media (max-width: 1150px) {
  .shell { grid-template-columns: 88px minmax(0, 1fr); }
  .rail { display: none; }
  .sidebar .nav-link span:not(.ni), .logo span { display: none; }
  .sidebar .badge { position: absolute; top: 2px; right: 2px; }
}
@media (max-width: 700px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; bottom: 0; top: auto; left: 0; right: 0; height: auto; flex-direction: row; justify-content: space-around; padding: 6px; border-right: 0; border-top: 2px solid var(--line); background: var(--bg); z-index: 20; }
  .logo { display: none; }
  .nav-link { padding: 8px; }
  main { padding: 16px 16px calc(90px + env(safe-area-inset-bottom)); }
  .sidebar { padding-bottom: calc(6px + env(safe-area-inset-bottom)); }
}

/* ============ Общие элементы ============ */
.btn { --c: var(--green); --cd: var(--green-dark); appearance: none; border: 0; cursor: pointer; background: var(--c); color: #fff; font-weight: 800; text-transform: uppercase; letter-spacing: .8px; font-size: 15px; padding: 13px 22px; border-radius: 14px; box-shadow: 0 4px 0 var(--cd); transition: filter .1s, transform .05s; }
.btn:hover { filter: brightness(1.06); }
.btn:active { transform: translateY(4px); box-shadow: 0 0 0 var(--cd); }
.btn:disabled { --c: var(--locked); --cd: var(--locked-dark); color: var(--muted); cursor: default; transform: none; }
.btn.blue { --c: var(--blue); --cd: var(--blue-dark); }
.btn.red { --c: var(--red); --cd: var(--red-dark); }
.btn.gold { --c: var(--gold); --cd: var(--gold-dark); }
.btn.ghost { --c: var(--bg); --cd: var(--line); color: var(--blue); border: 2px solid var(--line); box-shadow: 0 4px 0 var(--line); }
.btn.small { padding: 8px 14px; font-size: 13px; border-radius: 12px; }
.btn.wide { width: 100%; }
.card { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 18px; }
.muted { color: var(--muted); }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.pill { display: inline-flex; align-items: center; gap: 6px; font-weight: 800; padding: 6px 10px; border-radius: 12px; }
.pill:hover { background: var(--bg-soft); }
.pill.fire { color: var(--orange); } .pill.fire.cold { color: var(--muted); filter: grayscale(1); }
.pill.gem { color: var(--blue); } .pill.heart { color: var(--red); } .pill.lvl { color: var(--purple); }
.bar { height: 16px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--c, var(--green)); border-radius: 99px; transition: width .5s cubic-bezier(.3,1.4,.5,1); position: relative; }
.bar > i::after { content: ""; position: absolute; left: 8px; right: 8px; top: 4px; height: 4px; border-radius: 4px; background: rgba(255,255,255,.3); }
.empty { text-align: center; padding: 60px 20px; }
.empty .big { font-size: 80px; }

/* ============ Правая колонка ============ */
.statbar { display: flex; justify-content: space-between; }
.rail h3 { font-size: 20px; }
.goal-row { display: flex; gap: 14px; align-items: center; }
.goal-row .icon { font-size: 40px; }
.goal-row .bar { flex: 1; }

/* ============ Карта пути ============ */
.topic-tabs { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 6px; margin-bottom: 18px; }
.topic-tab { flex: none; display: flex; gap: 8px; align-items: center; border: 2px solid var(--line); border-radius: 14px; padding: 8px 14px; font-weight: 800; cursor: pointer; background: var(--card); color: var(--text); box-shadow: var(--shadow); }
.topic-tab.active { border-color: var(--tc); color: var(--tc); background: color-mix(in srgb, var(--tc) 10%, var(--card)); }
.topbar { display: flex; align-items: center; gap: 4px; justify-content: flex-end; margin-bottom: 14px; }
@media (min-width: 1151px) { .topbar.path-top { display: none; } }

.unit { margin-bottom: 36px; }
.unit-head { background: var(--tc); color: #fff; border-radius: var(--radius); padding: 18px 20px; display: flex; align-items: center; gap: 16px; box-shadow: 0 4px 0 color-mix(in srgb, var(--tc) 70%, #000); position: sticky; top: 8px; z-index: 5; }
.unit-head .u-icon { font-size: 40px; }
.unit-head small { text-transform: uppercase; font-weight: 800; opacity: .85; letter-spacing: .8px; }
.unit-head h2 { margin: 2px 0 2px; font-size: 22px; }
.unit-head p { margin: 0; opacity: .92; font-size: 15px; }
.nodes { display: flex; flex-direction: column; align-items: center; gap: 18px; padding: 70px 0 10px; }
.node-wrap { position: relative; }
.node { width: 76px; height: 70px; border-radius: 50%; border: 0; cursor: pointer; font-size: 32px; display: grid; place-items: center; background: var(--tc); box-shadow: 0 7px 0 color-mix(in srgb, var(--tc) 65%, #000); color: #fff; transition: transform .05s; position: relative; }
.node:active { transform: translateY(5px); box-shadow: 0 2px 0 color-mix(in srgb, var(--tc) 65%, #000); }
.node.done { background: var(--gold); box-shadow: 0 7px 0 var(--gold-dark); }
.node.locked { background: var(--locked); box-shadow: 0 7px 0 var(--locked-dark); cursor: not-allowed; filter: saturate(0); opacity: .9; }
.node .crown { position: absolute; right: -6px; top: -8px; font-size: 22px; }
/* Кольцо охватывает кнопку вместе с её «объёмной» тенью (7px снизу), иначе кнопка визуально проваливается вниз */
.node-wrap.current::before { content: ""; position: absolute; inset: -9px -9px -16px; border-radius: 50%; border: 6px solid color-mix(in srgb, var(--tc) 25%, transparent); pointer-events: none; }
.start-tip { position: absolute; bottom: calc(100% + 16px); left: 50%; transform: translateX(-50%); background: var(--card); border: 2px solid var(--line); color: var(--tc); font-weight: 900; padding: 8px 14px; border-radius: 12px; white-space: nowrap; animation: bob 1.2s ease-in-out infinite; text-transform: uppercase; letter-spacing: .6px; }
.start-tip::after { content: ""; position: absolute; top: 100%; left: 50%; margin-left: -8px; border: 8px solid transparent; border-top-color: var(--line); }
@keyframes bob { 50% { transform: translate(-50%, -6px); } }
.chest { font-size: 54px; margin-top: 6px; filter: grayscale(1) opacity(.45); }
.chest.earned { filter: none; animation: wiggle 2.5s ease-in-out infinite; }
@keyframes wiggle { 0%, 90%, 100% { transform: rotate(0); } 93% { transform: rotate(-8deg); } 97% { transform: rotate(8deg); } }

.popover { position: absolute; z-index: 10; top: calc(100% + 16px); left: 50%; transform: translateX(-50%); width: 280px; background: var(--tc); color: #fff; border-radius: var(--radius); padding: 16px; box-shadow: 0 8px 30px rgba(0,0,0,.2); text-align: left; }
.popover::before { content: ""; position: absolute; bottom: 100%; left: 50%; margin-left: -10px; border: 10px solid transparent; border-bottom-color: var(--tc); }
.popover h3 { margin: 0 0 4px; font-size: 18px; }
.popover p { margin: 0 0 12px; opacity: .92; }
.popover .btn { --c: #fff; --cd: rgba(0,0,0,.2); color: var(--tc); width: 100%; }
.popover.locked { --tc: var(--locked-dark); color: var(--text); background: var(--card); border: 2px solid var(--line); }
.popover.locked::before { border-bottom-color: var(--line); }

/* ============ Урок ============ */
.lesson-top { display: flex; align-items: center; gap: 16px; margin-bottom: 26px; }
.lesson-top .close { background: none; border: 0; font-size: 28px; color: var(--muted); cursor: pointer; padding: 0 4px; }
.lesson-top .bar { flex: 1; }
.ex-kind { color: var(--purple); font-weight: 900; text-transform: uppercase; letter-spacing: .8px; font-size: 14px; margin-bottom: 6px; }
.ex-kind.new::before { content: "✨ "; }
.prompt { font-size: 17px; font-weight: 500; margin: 0 0 16px; line-height: 1.55; }
.prompt > :first-child { font-size: 22px; font-weight: 800; line-height: 1.3; margin: 0 0 10px; }
.prompt p { margin: .55em 0; }
.prompt ul, .prompt ol { margin: .35em 0 .6em; padding-left: 24px; }
.prompt li { margin: .2em 0; }
.prompt li > ul, .prompt li > ol { margin: .2em 0; }
.prompt pre { font-size: 14px; margin: 8px 0 12px; }
.prompt code { font-size: .85em; }
.theory { font-size: 17px; line-height: 1.6; }
.theory h1, .theory h2, .theory h3 { margin-top: 1em; }
.md code, .prompt code { background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; font-size: .9em; }
.md pre, pre.code-view { background: var(--code-bg); color: var(--code-text); border: 2px solid var(--line); border-radius: 12px; padding: 14px 16px; overflow-x: auto; font-size: 15px; line-height: 1.55; margin: 12px 0; }
.md pre code { background: none; border: 0; padding: 0; }
.hl-kw { color: var(--hl-kw); font-weight: 600; } .hl-str { color: var(--hl-str); } .hl-num { color: var(--hl-num); }
.hl-com { color: var(--hl-com); font-style: italic; } .hl-fn { color: var(--hl-fn); } .hl-bi { color: var(--hl-bi); }

.editor { position: relative; border: 2px solid var(--line); border-radius: 12px; background: var(--code-bg); overflow: hidden; display: grid; grid-template-columns: auto 1fr; font-size: 15px; line-height: 1.55; }
.editor:focus-within { border-color: var(--blue); }
.editor .gutter { padding: 12px 8px 12px 12px; color: var(--muted); text-align: right; user-select: none; font-family: var(--mono); border-right: 1px solid var(--line); white-space: pre; }
.editor .area { display: grid; overflow: auto; max-height: 440px; }
.editor .area > * { grid-area: 1 / 1; }
.editor pre, .editor textarea { margin: 0; padding: 12px 14px; font: inherit; font-family: var(--mono); white-space: pre; tab-size: 4; letter-spacing: 0; border: 0; min-height: 180px; overflow-wrap: normal; }
.editor pre { color: var(--code-text); pointer-events: none; min-width: 100%; }
.editor textarea { width: 100%; height: 100%; resize: none; background: transparent; color: transparent; caret-color: var(--code-text); outline: none; overflow: hidden; }
.editor .gutter { min-height: 180px; }
.editor textarea::selection { background: color-mix(in srgb, var(--blue) 35%, transparent); color: transparent; }
textarea.answer { width: 100%; min-height: 110px; border: 2px solid var(--line); border-radius: 12px; background: var(--code-bg); color: var(--code-text); padding: 12px 14px; font-size: 16px; resize: vertical; outline: none; }
textarea.answer:focus { border-color: var(--blue); }
.tools { display: flex; gap: 10px; margin: 14px 0; flex-wrap: wrap; }
.console { margin-top: 12px; border-radius: 12px; border: 2px solid var(--line); overflow: hidden; }
.console .c-head { padding: 8px 14px; font-weight: 800; font-size: 13px; text-transform: uppercase; letter-spacing: .6px; background: var(--bg-soft); color: var(--muted); }
.console pre { margin: 0; padding: 12px 14px; font-size: 14px; white-space: pre-wrap; max-height: 220px; overflow: auto; background: var(--code-bg); color: var(--code-text); }
.console .err { color: var(--bad-text); }
.tests { list-style: none; margin: 0; padding: 8px 14px 12px; background: var(--code-bg); }
.tests li { padding: 4px 0; font-family: var(--mono); font-size: 14px; }
.tests li.ok { color: var(--good-text); } .tests li.fail { color: var(--bad-text); }
.hintbox { background: color-mix(in srgb, var(--gold) 18%, var(--card)); border: 2px solid var(--gold); border-radius: 12px; padding: 12px 14px; margin: 12px 0; }

.footer { position: fixed; left: 0; right: 0; bottom: 0; border-top: 2px solid var(--line); background: var(--bg); padding: 18px 24px calc(18px + env(safe-area-inset-bottom)); z-index: 30; }
.footer .inner { max-width: 900px; margin: 0 auto; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer.good { background: var(--good-bg); border-color: transparent; color: var(--good-text); }
.footer.bad { background: var(--bad-bg); border-color: transparent; color: var(--bad-text); }
.footer .verdict { font-size: 24px; font-weight: 900; display: flex; align-items: center; gap: 12px; }
.footer .verdict .ico { width: 56px; height: 56px; border-radius: 50%; background: var(--card); display: grid; place-items: center; font-size: 30px; }
.footer .detail { font-weight: 700; margin-top: 2px; white-space: pre-wrap; font-family: var(--mono); font-size: 14px; }
.lesson-body { padding-bottom: 150px; animation: slidein .25s ease-out; }
@keyframes slidein { from { opacity: 0; transform: translateX(24px); } }
.shake { animation: shake .4s; }
@keyframes shake { 20%, 60% { transform: translateX(-8px); } 40%, 80% { transform: translateX(8px); } }

/* ============ Финал урока ============ */
.finish { text-align: center; padding-top: 30px; }
.finish .hero { font-size: 110px; animation: pop .6s cubic-bezier(.3,1.8,.5,1); }
@keyframes pop { from { transform: scale(0); } }
.finish h1 { color: var(--gold-dark); font-size: 34px; }
.tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 26px 0; }
.tile { border-radius: 16px; border: 2px solid var(--c); background: var(--c); overflow: hidden; }
.tile small { display: block; color: #fff; font-weight: 900; text-transform: uppercase; font-size: 13px; padding: 6px; letter-spacing: .6px; }
.tile div { background: var(--card); color: var(--c); font-size: 24px; font-weight: 900; padding: 14px 6px; border-radius: 14px; }
.rewards { display: flex; flex-direction: column; gap: 12px; text-align: left; margin-bottom: 26px; }
.reward { display: flex; align-items: center; gap: 14px; animation: pop .5s both; }
.reward .ri { font-size: 42px; width: 64px; height: 64px; display: grid; place-items: center; background: var(--bg-soft); border-radius: 16px; flex: none; }
.reward b { display: block; font-size: 18px; }
.reward.trophy .ri { background: color-mix(in srgb, var(--gold) 25%, var(--card)); }

/* ============ Модалки, тосты, конфетти ============ */
#overlay:empty { display: none; }
#overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 100; display: grid; place-items: center; padding: 20px; }
.modal { background: var(--card); border-radius: 20px; padding: 28px; max-width: 440px; width: 100%; text-align: center; animation: pop .3s cubic-bezier(.3,1.5,.5,1); }
.modal .big { font-size: 72px; }
.modal .btns { display: flex; flex-direction: column; gap: 12px; margin-top: 20px; }
#toasts { position: fixed; top: calc(16px + env(safe-area-inset-top)); right: 16px; z-index: 200; display: flex; flex-direction: column; gap: 10px; }
.toast { background: var(--card); border: 2px solid var(--line); border-radius: 14px; padding: 12px 16px; display: flex; gap: 12px; align-items: center; box-shadow: 0 8px 24px rgba(0,0,0,.15); animation: toastin .4s cubic-bezier(.3,1.5,.5,1); max-width: 340px; }
.toast .ti { font-size: 32px; }
.toast small { display: block; color: var(--muted); }
@keyframes toastin { from { transform: translateX(120%); } }
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 150; }

/* ============ Награды и статистика ============ */
.section-title { font-size: 26px; margin: 8px 0 18px; }
.trophy-topic { margin-bottom: 22px; }
.trophy-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 12px; }
.medal { width: 104px; text-align: center; font-size: 13px; font-weight: 700; }
.medal .m { width: 84px; height: 84px; margin: 0 auto 6px; border-radius: 50%; display: grid; place-items: center; font-size: 40px; background: radial-gradient(circle at 35% 30%, #fff6c2, var(--gold) 60%, var(--gold-dark)); box-shadow: 0 4px 0 var(--gold-dark); }
.medal.off .m { background: var(--locked); box-shadow: 0 4px 0 var(--locked-dark); filter: grayscale(1); opacity: .6; }
.medal.cup .m { background: radial-gradient(circle at 35% 30%, #e6f7ff, var(--blue) 60%, var(--blue-dark)); box-shadow: 0 4px 0 var(--blue-dark); }
.ach-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.ach { display: flex; gap: 14px; align-items: center; }
.ach .ai { font-size: 40px; width: 64px; height: 64px; flex: none; display: grid; place-items: center; border-radius: 16px; background: color-mix(in srgb, var(--purple) 20%, var(--card)); }
.ach.off .ai { filter: grayscale(1); opacity: .45; background: var(--bg-soft); }
.ach b { display: block; }
.ach .bar { height: 10px; margin-top: 6px; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-bottom: 22px; }
.stat { display: flex; gap: 10px; align-items: center; }
.stat .si { font-size: 28px; }
.stat b { font-size: 22px; display: block; }
.stat small { color: var(--muted); font-weight: 700; }
.heatmap { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 14px); gap: 4px; overflow-x: auto; padding-bottom: 4px; }
.heatmap i { width: 14px; height: 14px; border-radius: 4px; background: var(--line); }
.heatmap i[data-l="1"] { background: color-mix(in srgb, var(--green) 35%, var(--line)); }
.heatmap i[data-l="2"] { background: color-mix(in srgb, var(--green) 65%, var(--line)); }
.heatmap i[data-l="3"] { background: var(--green); }
.heatmap i.goal { outline: 2px solid var(--gold); outline-offset: -2px; }
.xpbars { display: flex; align-items: flex-end; gap: 6px; height: 140px; margin-top: 10px; }
.xpbars div { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; height: 100%; justify-content: flex-end; font-size: 11px; color: var(--muted); font-weight: 700; }
.xpbars span { width: 100%; background: var(--blue); border-radius: 6px 6px 3px 3px; min-height: 3px; }
.xpbars .today span { background: var(--green); }

/* ============ Настройки / админка ============ */
.form { display: flex; flex-direction: column; gap: 14px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-weight: 800; font-size: 14px; }
.form label small { font-weight: 600; color: var(--muted); }
.input, select.input { width: 100%; border: 2px solid var(--line); border-radius: 12px; background: var(--bg-soft); color: var(--text); padding: 10px 12px; font: inherit; font-size: 15px; outline: none; }
.input:focus { border-color: var(--blue); }
textarea.input { min-height: 90px; resize: vertical; font-family: var(--mono); font-size: 14px; }
textarea.input.prose { font-family: inherit; }
.choice { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 10px; }
.choice button { border: 2px solid var(--line); background: var(--card); color: var(--text); border-radius: 14px; padding: 12px; cursor: pointer; font-weight: 800; box-shadow: var(--shadow); }
.choice button.on { border-color: var(--blue); color: var(--blue); background: color-mix(in srgb, var(--blue) 10%, var(--card)); }
.switch { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.toggle { width: 52px; height: 30px; border-radius: 99px; background: var(--line-strong); border: 0; position: relative; cursor: pointer; flex: none; }
.toggle::after { content: ""; position: absolute; top: 3px; left: 3px; width: 24px; height: 24px; border-radius: 50%; background: #fff; transition: left .15s; }
.toggle.on { background: var(--green); }
.toggle.on::after { left: 25px; }
.settings > .card { margin-bottom: 16px; }

.admin { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 18px; align-items: start; }
body.wide main { max-width: 1200px; }
@media (max-width: 950px) { .admin { grid-template-columns: 1fr; } }
.tree { font-size: 14px; max-height: calc(100vh - 140px); overflow: auto; padding: 10px; }
.tree ul { list-style: none; margin: 0; padding-left: 14px; }
.tree > ul { padding-left: 0; }
.tree .t-item { display: flex; align-items: center; gap: 6px; padding: 5px 8px; border-radius: 8px; cursor: pointer; font-weight: 700; }
.tree .t-item:hover { background: var(--bg-soft); }
.tree .t-item.sel { background: color-mix(in srgb, var(--blue) 15%, transparent); color: var(--blue); }
.tree .t-item span.lbl { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree .add { color: var(--blue); font-weight: 800; font-size: 13px; padding: 4px 8px; cursor: pointer; }
.tree .add:hover { text-decoration: underline; }
.tree .kind { font-size: 11px; color: var(--muted); }
.admin-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: space-between; margin-top: 8px; }
.result-box { font-family: var(--mono); font-size: 13px; white-space: pre-wrap; padding: 10px 12px; border-radius: 10px; background: var(--code-bg); border: 2px solid var(--line); max-height: 240px; overflow: auto; }
.result-box.ok { border-color: var(--green); } .result-box.fail { border-color: var(--red); }
.node-wrap:has(.popover) .start-tip { display: none; }
.reward span { display: block; }
.topic-tab small { font-weight: 700; }
.theory p, .prompt p { margin: .4em 0; }
.node-wrap:has(.popover) { z-index: 20; }
.nodes .node-wrap.current:not(:first-child) { margin-top: 44px; }

/* ============ Подписи уроков на карте ============ */
.node-label { position: absolute; top: 50%; transform: translateY(-50%); width: max-content; max-width: 170px; line-height: 1.25; pointer-events: none; }
.node-label.right { left: calc(100% + 16px); text-align: left; }
.node-label.left { right: calc(100% + 16px); text-align: right; }
.node-label b { display: block; font-size: 15px; font-weight: 800; }
.node-label small { color: var(--muted); font-weight: 700; font-size: 12px; }
.node-wrap.current .node-label b { color: var(--tc); }
.node-wrap.locked .node-label b { color: var(--muted); }
.node-wrap:has(.popover) .node-label { visibility: hidden; }
@media (max-width: 700px) { .node-label { max-width: 120px; } .node-label b { font-size: 13px; } }

/* ============ О приложении ============ */
.about { display: flex; flex-direction: column; gap: 16px; }
.about-hero { text-align: center; padding: 10px 0 6px; }
.about-hero .big { font-size: 72px; }
.about-hero p { max-width: 560px; margin: 0 auto; line-height: 1.5; }
.about-sec { line-height: 1.6; }
.about-sec h2 { display: flex; align-items: center; gap: 10px; font-size: 22px; }
.about-sec p { margin: .5em 0; }
.about-sec ul { margin: .4em 0; padding-left: 22px; }
.about-sec li { margin: .3em 0; }
.chip { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 13px; font-weight: 800; background: var(--green); color: #fff; }
.chip.gold { background: var(--gold); }
.chip.gray { background: var(--locked); color: var(--muted); }
.table-wrap { overflow-x: auto; }
.about-table { border-collapse: collapse; width: 100%; margin: 8px 0; }
.about-table td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.about-table td:last-child { white-space: nowrap; color: var(--blue); }
.levels { display: grid; grid-template-columns: repeat(auto-fill, minmax(78px, 1fr)); gap: 8px; }
.levels div { text-align: center; border: 2px solid var(--line); border-radius: 12px; padding: 6px; }
.levels b { display: block; font-size: 20px; color: var(--purple); }
.levels small { color: var(--muted); font-weight: 700; }
.ach-mini { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 8px; }
.ach-mini div { display: grid; grid-template-columns: 34px 1fr; column-gap: 8px; align-items: center; }
.ach-mini span { grid-row: span 2; font-size: 26px; }
.ach-mini small { color: var(--muted); font-size: 12px; line-height: 1.3; }
kbd { font-family: var(--mono); font-size: 12px; border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 6px; padding: 1px 6px; background: var(--bg-soft); }
@media (max-width: 700px) { .about-table td:last-child { white-space: normal; } }

/* ============ Дневная цель выполнена ============ */
.goal-done { font-size: 20px; font-weight: 900; color: var(--good-text); }

/* ============ Урок: сегментная шкала и навигация ============ */
.segs { flex: 1; display: flex; gap: 5px; align-items: center; min-width: 0; }
.seg { flex: 1; height: 16px; min-width: 6px; border: 0; padding: 0; border-radius: 99px; background: var(--line); cursor: pointer; position: relative; transition: background .25s, transform .1s; }
.seg.theory { flex: .55; }
.seg:disabled { cursor: default; opacity: .55; }
.seg:not(:disabled):hover { transform: scaleY(1.25); }
.seg.done { background: var(--tc, var(--green)); }
.seg.done::after { content: ""; position: absolute; left: 6px; right: 6px; top: 4px; height: 4px; border-radius: 4px; background: rgba(255,255,255,.3); }
.seg.fail { background: color-mix(in srgb, var(--red) 55%, var(--line)); }
.seg.cur { outline: 3px solid color-mix(in srgb, var(--tc, var(--green)) 45%, transparent); outline-offset: 2px; }
.seg.cur:not(.done):not(.fail) { background: color-mix(in srgb, var(--tc, var(--green)) 30%, var(--line)); }
.solved-banner { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; justify-content: space-between; background: var(--good-bg); color: var(--good-text); font-weight: 800; border-radius: 12px; padding: 10px 14px; margin-bottom: 14px; }
.solved-banner.redo { background: color-mix(in srgb, var(--blue) 14%, var(--card)); color: var(--blue); }
textarea[readonly].answer, .editor:has(textarea[readonly]) { opacity: .92; }
.editor:has(textarea[readonly]) { border-color: var(--green); }
body.focus main { overflow-x: clip; }

/* ============ Каталог тем ============ */
.continue { display: flex; align-items: center; gap: 16px; background: var(--tc); color: #fff; border-radius: 20px; padding: 16px 18px; margin-bottom: 26px; box-shadow: 0 5px 0 color-mix(in srgb, var(--tc) 65%, #000); transition: transform .1s; }
.continue:hover { transform: translateY(-2px); }
.continue:active { transform: translateY(3px); box-shadow: 0 2px 0 color-mix(in srgb, var(--tc) 65%, #000); }
.continue .c-icon { font-size: 44px; width: 64px; height: 64px; display: grid; place-items: center; background: rgba(255,255,255,.2); border-radius: 16px; flex: none; }
.continue .c-body { flex: 1; min-width: 0; }
.continue small { text-transform: uppercase; font-weight: 900; letter-spacing: .8px; opacity: .9; font-size: 12px; }
.continue b { display: block; font-size: 18px; margin: 2px 0 8px; overflow: hidden; text-overflow: ellipsis; }
.continue .c-meta { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 13px; }
.continue .c-meta .bar { flex: 1; max-width: 220px; height: 10px; background: rgba(255,255,255,.3); }
.continue .c-meta .bar i { background: #fff; }
.continue .c-btn { --c: #fff; --cd: rgba(0,0,0,.2); color: var(--tc); flex: none; }
@media (max-width: 560px) { .continue { flex-wrap: wrap; } .continue .c-btn { width: 100%; text-align: center; } }

.topic-group { margin-bottom: 30px; }
.group-title { font-size: 22px; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.group-title small { font-size: 14px; font-weight: 700; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.topic-card { display: flex; flex-direction: column; gap: 6px; background: var(--card); border: 2px solid var(--line); border-radius: 20px; padding: 16px; box-shadow: 0 4px 0 var(--line); transition: transform .1s, border-color .15s; }
.topic-card:hover { border-color: var(--tc); transform: translateY(-2px); }
.topic-card:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--line); }
.topic-card.finished { background: color-mix(in srgb, var(--gold) 8%, var(--card)); }
.tc-head { display: flex; justify-content: space-between; align-items: flex-start; }
.tc-icon { font-size: 30px; width: 54px; height: 54px; display: grid; place-items: center; border-radius: 16px; background: color-mix(in srgb, var(--tc) 18%, var(--card)); color: var(--tc); font-weight: 900; }
.tc-cup { font-size: 26px; }
.topic-card h3 { margin: 6px 0 0; font-size: 18px; }
.topic-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.4; flex: 1; }
.tc-foot { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; }
.tc-foot .bar { height: 10px; --c: var(--tc); }
.tc-foot small { color: var(--muted); font-weight: 700; font-size: 12px; }
.tc-action { color: var(--tc); font-weight: 900; text-transform: uppercase; letter-spacing: .6px; font-size: 13px; }

/* ============ Шапка страницы темы ============ */
.topic-head { display: flex; flex-direction: column; gap: 14px; margin-bottom: 22px; }
.topic-head .btn { align-self: flex-start; }
.th-title { display: flex; align-items: center; gap: 14px; }
.th-title > span { font-size: 34px; width: 64px; height: 64px; display: grid; place-items: center; border-radius: 18px; background: color-mix(in srgb, var(--tc) 18%, var(--card)); color: var(--tc); font-weight: 900; flex: none; }
.th-title h1 { margin: 0 0 6px; font-size: 26px; }
.th-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.th-meta .bar { width: 180px; height: 10px; --c: var(--tc); }
@media (max-width: 700px) {
  .sidebar { gap: 2px; padding: 6px 4px; justify-content: stretch; }
  .sidebar .nav-link { flex: 1 1 0; min-width: 0; justify-content: center; padding: 8px 0; gap: 0; }
  .sidebar .ni { font-size: 22px; width: auto; }
}

/* ============ Подробная теория ============ */
details.cheat { margin-top: 26px; border: 2px dashed color-mix(in srgb, var(--blue) 50%, var(--line)); border-radius: 16px; background: color-mix(in srgb, var(--blue) 6%, var(--card)); padding: 4px 18px; }
details.cheat > summary { cursor: pointer; font-weight: 800; padding: 12px 0; color: var(--blue); }
details.cheat[open] > summary { border-bottom: 1px solid var(--line); margin-bottom: 8px; }
/* md(): «## раздел» → h3, «### пример» → h4 */
.theory.full h3 { font-size: 22px; margin-top: 1.6em; padding-top: .7em; border-top: 2px solid var(--line); }
.theory.full h3:first-child { border-top: 0; margin-top: .4em; padding-top: 0; }
.theory.full h4 { font-size: 17px; margin: 1.3em 0 .3em; color: var(--tc, var(--green)); }
.theory pre[data-lang]::before { content: attr(data-lang); display: block; font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .8px; color: var(--muted); margin-bottom: 6px; }
.runnable { border: 2px solid var(--line); border-radius: 14px; margin: 14px 0; overflow: hidden; background: var(--card); }
.runnable .rb-bar { display: flex; align-items: center; gap: 8px; padding: 8px 10px; background: var(--bg-soft); border-bottom: 2px solid var(--line); font-weight: 800; font-size: 13px; color: var(--muted); }
.runnable .rb-code pre { margin: 0; border: 0; border-radius: 0; }
.runnable .rb-code .editor { border: 0; border-radius: 0; }
.runnable .rb-out .console { margin: 0; border: 0; border-top: 2px solid var(--line); border-radius: 0; }

/* ============ Проверь себя ============ */
.seg.quiz { flex: .55; }
.quiz-options { display: flex; flex-direction: column; gap: 10px; margin: 6px 0 16px; }
.quiz-opt { display: flex; align-items: center; gap: 14px; text-align: left; border: 2px solid var(--line); border-radius: 14px; background: var(--card); color: var(--text); padding: 12px 14px; font: inherit; font-size: 16px; cursor: pointer; box-shadow: 0 3px 0 var(--line); }
.quiz-opt:not(:disabled):hover { border-color: var(--blue); background: color-mix(in srgb, var(--blue) 6%, var(--card)); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt .md p { margin: 0; }
.quiz-opt .md pre { margin: 6px 0 0; font-size: 13px; }
.qo-key { flex: none; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-weight: 900; border: 2px solid var(--line); color: var(--muted); }
.quiz-opt.right { border-color: var(--green); background: var(--good-bg); box-shadow: 0 3px 0 var(--green); }
.quiz-opt.right .qo-key { border-color: var(--green); color: var(--good-text); }
.quiz-opt.wrong { border-color: var(--red); background: var(--bad-bg); box-shadow: 0 3px 0 var(--red); }
.quiz-opt.wrong .qo-key { border-color: var(--red); color: var(--bad-text); }
.quiz-opt.dim { opacity: .55; }
.quiz-explain { border-radius: 14px; padding: 12px 16px; line-height: 1.55; }
.quiz-explain p { display: inline; margin: 0; }
.quiz-explain.right { background: var(--good-bg); color: var(--good-text); }
.quiz-explain.wrong { background: var(--bad-bg); color: var(--bad-text); }

/* ---------- Вход и регистрация ---------- */
body.auth .sidebar, body.auth .rail { display: none; }
body.auth .shell { grid-template-columns: minmax(0, 1fr); }
.auth-box { max-width: 420px; margin: 0 auto; padding-block: 8vh 40px; }
.auth-logo { font-size: 40px; font-weight: 900; color: var(--green); text-align: center; letter-spacing: -.5px; }
.auth-sub { text-align: center; margin: 4px 0 22px; font-weight: 700; }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 18px; background: var(--bg-soft); border-radius: 14px; padding: 4px; }
.auth-tabs button { border: 0; background: none; font: inherit; font-weight: 800; font-size: 14px; text-transform: uppercase; letter-spacing: .6px; color: var(--muted); padding: 10px; border-radius: 11px; cursor: pointer; }
.auth-tabs button.on { background: var(--bg); color: var(--blue); box-shadow: 0 2px 0 var(--line); }
.auth-note { margin: 0; font-size: 13px; }
.auth-error { margin: 0; color: var(--red); font-weight: 800; }
.account-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.account-row .avatar { width: 48px; height: 48px; border-radius: 50%; background: var(--blue); color: #fff; display: grid; place-items: center; font-size: 22px; font-weight: 900; }

/* ---------- Сводка на главной для телефона и планшета (там нет боковой колонки) ---------- */
.status-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px 18px; margin-bottom: 18px; padding: 14px 16px; }
.ss-item { display: flex; flex-direction: column; gap: 6px; min-width: 0; font-size: 14px; }
.ss-item b { font-size: 14px; }
.ss-item small { font-size: 12px; }
.ss-item .goal-done { font-size: 16px; }
.ss-hearts { font-size: 18px; letter-spacing: -1px; white-space: nowrap; overflow: hidden; }
@media (min-width: 1151px) { .status-strip { display: none; } }
@media (max-width: 700px) { .status-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); } }