/* ==========================================================
   Chiziqli algebra — o‘quv portali · dizayn tizimi
   ========================================================== */
:root {
  /* surfaces */
  --bg: #0a0f1c;
  --bg-2: #0d1324;
  --card: #121a2d;
  --card-2: #172139;
  --card-3: #1c2843;
  --border: #233152;
  --border-2: #31436d;
  /* text */
  --text: #e9edf7;
  --muted: #a2acc6;
  --faint: #6c7795;
  /* brand */
  --pri: #7c8cff;
  --pri-2: #a3adff;
  --pri-ink: #0b1030;
  --pri-soft: rgba(124, 140, 255, .14);
  --gold: #e2b65c;
  --teal: #3cc8b4;
  --rose: #f07c8c;
  --ok: #4cc38a;
  --bad: #f06a6a;
  --warn: #f0a35a;
  --ok-soft: rgba(76, 195, 138, .14);
  /* bg formulas (r,g,b) */
  --bg-f1: 226,182,92;
  --bg-f2: 124,140,255;
  /* misc */
  --sh-1: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px -12px rgba(0, 0, 0, .6);
  --sh-2: 0 2px 6px rgba(0, 0, 0, .35), 0 24px 60px -24px rgba(0, 0, 0, .75);
  --r-s: 8px; --r: 14px; --r-l: 20px;
  --sb: 272px; --sb-c: 76px; --tb: 64px;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Source Serif 4", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f4f6fb;
  --bg-2: #eef1f8;
  --card: #ffffff;
  --card-2: #f6f8fc;
  --card-3: #eef1f8;
  --border: #e1e6f0;
  --border-2: #cad2e2;
  --text: #121827;
  --muted: #4a5468;
  --faint: #8790a4;
  --pri: #4f5bd5;
  --pri-2: #3b46b8;
  --pri-ink: #ffffff;
  --pri-soft: rgba(79, 91, 213, .1);
  --gold: #b07a1c;
  --teal: #0f9a88;
  --rose: #cf4a5e;
  --ok: #1f9a62;
  --bad: #d23d3d;
  --warn: #c46a16;
  --ok-soft: rgba(31, 154, 98, .1);
  --bg-f1: 176,122,28;
  --bg-f2: 79,91,213;
  --sh-1: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px -14px rgba(16, 24, 40, .2);
  --sh-2: 0 2px 8px rgba(16, 24, 40, .08), 0 24px 60px -28px rgba(16, 24, 40, .35);
  color-scheme: light;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); font: 400 15px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
body::before { content: ""; position: fixed; inset: 0; z-index: -2; background: radial-gradient(1000px 520px at 85% -10%, rgba(var(--bg-f2), .10), transparent 60%), radial-gradient(800px 480px at 15% 110%, rgba(var(--bg-f1), .06), transparent 60%), var(--bg); }
#bgMath { position: fixed; inset: 0; z-index: -1; pointer-events: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4, p, figure { margin: 0; }
img, svg, canvas, iframe { max-width: 100%; }
code, kbd { font-family: var(--mono); }
[hidden] { display: none !important; }
svg[data-i] { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
:focus-visible { outline: 2px solid var(--pri); outline-offset: 2px; border-radius: 6px; }
.skip { position: fixed; left: 12px; top: -60px; z-index: 200; padding: 10px 14px; border-radius: 8px; background: var(--pri); color: var(--pri-ink); font-weight: 600; }
.skip:focus { top: 12px; }
.muted { color: var(--muted); }
.mt { margin-top: 20px; } .mt-s { margin-top: 12px; }
kbd { display: inline-block; padding: 2px 6px; border-radius: 5px; border: 1px solid var(--border-2); background: var(--card-2); font-size: 11px; color: var(--muted); line-height: 1.4; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 40px; padding: 0 16px; border-radius: 10px; border: 1px solid transparent; font-weight: 600; font-size: 14px; cursor: pointer; white-space: nowrap; transition: background .15s, border-color .15s, transform .1s, box-shadow .15s; }
.btn:active { transform: translateY(1px); }
.btn--pri { background: var(--pri); color: var(--pri-ink); box-shadow: 0 6px 18px -8px var(--pri); }
.btn--pri:hover { background: var(--pri-2); }
.btn--sec { background: var(--card-2); border-color: var(--border-2); }
.btn--sec:hover { border-color: var(--pri); }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--muted); }
.btn--ghost:hover { color: var(--text); border-color: var(--border-2); background: var(--card-2); }
.btn--sm { height: 34px; padding: 0 12px; font-size: 13px; }
.btn--xs { height: 28px; padding: 0 9px; font-size: 12px; border-radius: 7px; gap: 6px; }
.btn--xs svg[data-i] { width: 14px; height: 14px; }
.btn.is-done { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.ib { width: 36px; height: 36px; display: grid; place-items: center; flex: none; border-radius: 9px; border: 1px solid var(--border); background: var(--card); color: var(--muted); cursor: pointer; transition: .15s; }
.ib:hover { color: var(--text); border-color: var(--border-2); background: var(--card-2); }
.ib:disabled { opacity: .35; pointer-events: none; }
.i-sun { display: none; } :root[data-theme="light"] .i-sun { display: block; } :root[data-theme="light"] .i-moon { display: none; }
.link { padding: 0; border: 0; background: none; color: var(--pri); font-weight: 600; font-size: 13.5px; cursor: pointer; }
.link:hover { text-decoration: underline; }
.tag { font: 600 11px var(--mono); padding: 4px 8px; border-radius: 6px; background: var(--pri-soft); color: var(--pri); flex: none; }

/* ---------- chips ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-flex; align-items: center; gap: 6px; height: 28px; padding: 0 10px; border-radius: 999px; border: 1px solid var(--border-2); background: var(--card-2); font-size: 12.5px; font-weight: 500; color: var(--muted); white-space: nowrap; }
.chip b { color: var(--text); font-weight: 600; }
.chip--pri { background: var(--pri-soft); border-color: transparent; color: var(--pri); }
.chip--gold { background: rgba(var(--bg-f1), .14); border-color: transparent; color: var(--gold); }
.chip--ok { background: var(--ok-soft); border-color: transparent; color: var(--ok); }
.chips--sm .chip { height: 24px; font-size: 11.5px; padding: 0 8px; }

/* ===================== SIDEBAR ===================== */
.sb { position: fixed; z-index: 60; top: 0; left: 0; bottom: 0; width: var(--sb); display: flex; flex-direction: column; gap: 14px; padding: 16px 14px; background: color-mix(in srgb, var(--bg-2) 92%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-right: 1px solid var(--border); transition: width .2s ease, transform .25s ease; }
.sb__top { display: flex; align-items: center; gap: 8px; }
.logo { display: flex; align-items: center; gap: 11px; min-width: 0; flex: 1; }
.logo img { border-radius: 11px; flex: none; box-shadow: 0 8px 20px -8px rgba(111, 125, 255, .75); }
.logo__t { min-width: 0; }
.logo__t b { display: block; font-weight: 700; font-size: 15px; letter-spacing: -.2px; white-space: nowrap; }
.logo__t small { display: block; font: 500 11px var(--mono); color: var(--faint); white-space: nowrap; }
.sb__collapse { width: 30px; height: 30px; border: 0; background: transparent; }
.sb__search { display: flex; align-items: center; gap: 10px; height: 40px; padding: 0 10px 0 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--faint); cursor: pointer; text-align: left; }
.sb__search:hover { border-color: var(--border-2); color: var(--muted); }
.sb__search span { flex: 1; font-size: 13.5px; }
.sb__nav { display: grid; gap: 2px; overflow-y: auto; }
.sb__label { margin: 6px 10px 6px; font: 600 11px var(--sans); letter-spacing: .6px; text-transform: uppercase; color: var(--faint); }
.sb__nav a { position: relative; display: flex; align-items: center; gap: 12px; height: 40px; padding: 0 12px; border-radius: 10px; color: var(--muted); font-weight: 500; font-size: 14px; transition: background .15s, color .15s; }
.sb__nav a span { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sb__nav a em { font-style: normal; font: 600 11px var(--mono); padding: 2px 7px; border-radius: 999px; background: var(--card-3); color: var(--muted); }
.sb__nav a:hover { background: var(--card); color: var(--text); }
.sb__nav a.is-on { background: var(--pri-soft); color: var(--text); }
.sb__nav a.is-on svg { color: var(--pri); }
.sb__nav a.is-on::before { content: ""; position: absolute; left: -14px; top: 9px; bottom: 9px; width: 3px; border-radius: 0 3px 3px 0; background: var(--pri); }
.sb__progress { margin-top: auto; padding: 14px; border-radius: var(--r); border: 1px solid var(--border); background: var(--card); }
.sbp__head { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--muted); margin-bottom: 8px; }
.sbp__head b { font: 600 12.5px var(--mono); color: var(--text); }
.bar { height: 6px; border-radius: 6px; background: var(--card-3); overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; border-radius: 6px; background: linear-gradient(90deg, var(--pri), var(--teal)); transition: width .4s ease; }
.sbp__cont { display: flex; align-items: center; gap: 8px; margin-top: 12px; font-size: 13px; font-weight: 600; color: var(--pri); }
.sbp__cont svg[data-i] { width: 15px; height: 15px; }
.sbp__cont span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sb__foot { display: flex; align-items: center; gap: 6px; margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border); }
.sb__year { margin-left: auto; font: 500 11.5px var(--mono); color: var(--faint); }
.sb-scrim { display: none; }

/* collapsed sidebar */
.is-collapsed .sb { width: var(--sb-c); }
.is-collapsed .logo__t, .is-collapsed .sb__search span, .is-collapsed .sb__search kbd, .is-collapsed .sb__label,
.is-collapsed .sb__nav a span, .is-collapsed .sb__nav a em, .is-collapsed .sb__progress, .is-collapsed .sb__year { display: none; }
.is-collapsed .sb__top { flex-direction: column; }
.is-collapsed .sb__nav a, .is-collapsed .sb__search { justify-content: center; padding: 0; }
.is-collapsed .sb__foot { flex-direction: column; }
.is-collapsed .sb__collapse svg { transform: scaleX(-1); }

/* ===================== APP SHELL ===================== */
.app { margin-left: var(--sb); min-height: 100vh; transition: margin-left .2s ease; }
.is-collapsed .app { margin-left: var(--sb-c); }
.tb { position: sticky; top: 0; z-index: 40; height: var(--tb); display: flex; align-items: center; gap: 14px; padding: 0 28px; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.tb__menu { display: none; }
.crumbs { display: flex; align-items: center; gap: 8px; min-width: 0; font-size: 13.5px; color: var(--faint); }
.crumbs a { color: var(--muted); } .crumbs a:hover { color: var(--text); }
.crumbs b { color: var(--text); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.crumbs svg[data-i] { width: 14px; height: 14px; }
.tb__act { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.tb__search { display: flex; align-items: center; gap: 10px; width: 300px; height: 38px; padding: 0 8px 0 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--faint); cursor: pointer; }
.tb__search:hover { border-color: var(--border-2); }
.tb__search span { flex: 1; text-align: left; font-size: 13.5px; }
.tb__theme { display: none; }
main { max-width: 1320px; margin: 0 auto; padding: 28px 28px 40px; outline: none; }
.page { display: none; }
.page.is-on { display: block; animation: pageIn .35s ease; }
@keyframes pageIn { from { opacity: 0; transform: translateY(8px); } }
.foot { display: flex; align-items: center; gap: 10px; margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 12.5px; color: var(--faint); }
.foot img { border-radius: 6px; }

/* ---------- page header ---------- */
.ph { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 22px; }
.ph h1 { font-size: clamp(26px, 3vw, 34px); font-weight: 700; letter-spacing: -.8px; line-height: 1.15; }
.ph p { margin-top: 6px; color: var(--muted); }
.sh { margin: 34px 0 14px; font-size: 13px; font-weight: 600; letter-spacing: .5px; text-transform: uppercase; color: var(--faint); }
.lead { max-width: 860px; margin-bottom: 18px; }

/* ---------- cards & grids ---------- */
.card { position: relative; min-width: 0; padding: 22px; border-radius: var(--r-l); background: var(--card); border: 1px solid var(--border); box-shadow: var(--sh-1); }
.card__h { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 16px; }
.card__h h2 { font-size: 16.5px; font-weight: 650; font-weight: 600; letter-spacing: -.2px; }
.card__h .muted { font-size: 12.5px; }
.card--warn { border-color: color-mix(in srgb, var(--warn) 45%, var(--border)); background: linear-gradient(180deg, color-mix(in srgb, var(--warn) 8%, var(--card)), var(--card)); }
.card--click { cursor: pointer; text-align: left; transition: border-color .15s, transform .15s, box-shadow .15s; }
.card--click:hover { border-color: var(--border-2); transform: translateY(-2px); box-shadow: var(--sh-2); }
.grid { display: grid; gap: 18px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.prose { color: var(--muted); }
.clamp { display: -webkit-box; -webkit-line-clamp: 5; -webkit-box-orient: vertical; overflow: hidden; }
.clamp.is-open { -webkit-line-clamp: unset; }

/* ===================== HOME ===================== */
.home { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.hero { grid-column: span 7; display: flex; flex-direction: column; justify-content: center; gap: 16px; padding: 34px; overflow: hidden; background: radial-gradient(600px 300px at 100% 0%, var(--pri-soft), transparent 70%), var(--card); }
.eyebrow { font: 600 12px var(--mono); letter-spacing: .6px; text-transform: uppercase; color: var(--pri); }
.hero__t { font: 600 clamp(40px, 5.4vw, 66px)/1.02 var(--serif); letter-spacing: -1.2px; }
.hero__s { color: var(--muted); font-size: 16px; max-width: 560px; }
.hero__cta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.viz { grid-column: span 5; padding: 0; overflow: hidden; display: flex; flex-direction: column; background: radial-gradient(circle at 50% 38%, #16213a, #080c15 78%); border-color: #26345a; }
.viz__bar { display: flex; align-items: center; gap: 10px; padding: 12px 16px; font: 500 12px var(--mono); color: #a2acc6; border-bottom: 1px solid rgba(255,255,255,.07); }
.viz__bar b { margin-left: auto; color: #e2b65c; font-weight: 500; }
.live { width: 7px; height: 7px; border-radius: 50%; background: #4cc38a; box-shadow: 0 0 8px #4cc38a; }
.viz__canvas { flex: 1; min-height: 300px; cursor: grab; touch-action: pan-y; }
.viz__canvas:active { cursor: grabbing; }
.viz__hud { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; border-top: 1px solid rgba(255,255,255,.07); color: #e9edf7; flex-wrap: wrap; }
.viz__hud > div { display: flex; align-items: center; gap: 10px; }
.viz__hud .k { font: 500 12px var(--mono); color: #a2acc6; }
.mx3 { display: inline-grid; grid-template-columns: repeat(3, 5.2ch); gap: 0 8px; padding: 2px 8px; border-left: 1.5px solid #e9edf7; border-right: 1.5px solid #e9edf7; border-radius: 4px; font: 500 12px/1.55 var(--mono); text-align: right; }
.mx3 i { font-style: normal; }
.viz__det b { font: 600 22px var(--mono); color: #e2b65c; }

.kpis { grid-column: span 12; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.kpi { display: flex; align-items: center; gap: 14px; padding: 18px 20px; border-radius: var(--r-l); background: var(--card); border: 1px solid var(--border); box-shadow: var(--sh-1); }
.kpi__ic { width: 44px; height: 44px; flex: none; display: grid; place-items: center; border-radius: 12px; background: var(--c-soft, var(--pri-soft)); color: var(--c, var(--pri)); }
.kpi__ic svg[data-i] { width: 22px; height: 22px; }
.kpi small { display: block; font-size: 12.5px; color: var(--muted); }
.kpi b { display: block; font-size: 24px; font-weight: 700; letter-spacing: -.5px; line-height: 1.2; }
.kpi b span { display: block; font-size: 12px; font-weight: 500; color: var(--faint); letter-spacing: 0; line-height: 1.3; }
.kpi > div { min-width: 0; }
.ring { position: relative; width: 48px; height: 48px; flex: none; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring circle { fill: none; stroke-width: 5; }
.ring .bg { stroke: var(--card-3); }
.ring .fg { stroke: var(--teal); stroke-linecap: round; transition: stroke-dashoffset .5s ease; }
.ring span { position: absolute; inset: 0; display: grid; place-items: center; font: 600 11px var(--mono); }

.next { grid-column: span 7; display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: center; }
.next__k { font: 600 11.5px var(--mono); letter-spacing: .5px; text-transform: uppercase; color: var(--teal); }
.next h3 { margin: 6px 0 8px; font-size: 19px; font-weight: 600; letter-spacing: -.3px; line-height: 1.3; }
.next p { color: var(--muted); font-size: 13.5px; }
.next .bar { margin-top: 14px; max-width: 420px; }
.next__steps { display: flex; gap: 4px; margin-top: 14px; flex-wrap: wrap; }
.next__steps i { width: 22px; height: 6px; border-radius: 4px; background: var(--card-3); }
.next__steps i.d { background: var(--teal); }
.next__steps i.on { background: var(--gold); }
.teacher-mini { grid-column: span 5; display: flex; flex-direction: column; gap: 14px; }
.tm { display: flex; align-items: center; gap: 14px; }
.avatar { width: 52px; height: 52px; flex: none; display: grid; place-items: center; border-radius: 16px; background: linear-gradient(135deg, var(--pri), var(--teal)); color: #fff; font-weight: 700; font-size: 17px; letter-spacing: .5px; }
.tm small { display: block; font-size: 12px; color: var(--faint); }
.tm b { display: block; font-size: 15.5px; font-weight: 600; line-height: 1.3; }
.tm__row { display: flex; gap: 8px; flex-wrap: wrap; }

.passport { grid-column: span 7; }
.about { grid-column: span 5; display: flex; flex-direction: column; gap: 10px; }
.outcomes { grid-column: span 12; }
.pp { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.pp div { display: flex; flex-direction: column; gap: 3px; padding: 11px 14px; border-radius: 10px; background: var(--card-2); border: 1px solid var(--border); min-width: 0; }
.pp div.wide { grid-column: 1 / -1; }
.pp dt { font-size: 11.5px; font-weight: 500; color: var(--faint); }
.pp dd { margin: 0; font-weight: 600; font-size: 14px; overflow-wrap: anywhere; }
.pp dd.num { font-family: var(--mono); color: var(--pri); }
.hours { display: grid; gap: 9px; margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); }
.hr { display: grid; grid-template-columns: 120px 1fr 34px; gap: 10px; align-items: center; font-size: 13px; color: var(--muted); }
.hr .bar i { background: var(--c); }
.hr b { font: 600 13px var(--mono); color: var(--text); text-align: right; }
.tn { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.tn li { display: grid; grid-template-columns: 44px 1fr; gap: 12px; align-items: start; padding: 12px 14px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); font-size: 13.5px; color: var(--muted); }
.tn b { display: grid; place-items: center; height: 26px; border-radius: 7px; font: 600 11.5px var(--mono); background: var(--pri-soft); color: var(--pri); }
.tn li.k b { background: rgba(var(--bg-f1), .15); color: var(--gold); }
.tn em { display: block; font-style: normal; font-size: 11px; font-weight: 600; color: var(--faint); text-transform: uppercase; letter-spacing: .5px; }
.tn li:last-child:nth-child(odd) { grid-column: 1 / -1; }

/* ===================== TOPICS ===================== */
.toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 18px; }
.field { flex: 1 1 300px; display: flex; align-items: center; gap: 10px; height: 42px; padding: 0 14px; border-radius: 11px; border: 1px solid var(--border); background: var(--card); color: var(--faint); }
.field:focus-within { border-color: var(--pri); box-shadow: 0 0 0 3px var(--pri-soft); }
.field input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--text); font: inherit; }
.seg { display: inline-flex; padding: 4px; gap: 2px; border-radius: 11px; border: 1px solid var(--border); background: var(--card); overflow-x: auto; max-width: 100%; }
.seg button { height: 32px; padding: 0 12px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font-size: 13px; font-weight: 500; cursor: pointer; white-space: nowrap; }
.seg button:hover { color: var(--text); }
.seg button.is-on { background: var(--card-3); color: var(--text); box-shadow: var(--sh-1); }
.ring-s { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--muted); }
.tgrid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.tc { display: flex; flex-direction: column; gap: 12px; padding: 18px; border-radius: var(--r-l); background: var(--card); border: 1px solid var(--border); box-shadow: var(--sh-1); cursor: pointer; text-align: left; transition: border-color .15s, transform .15s, box-shadow .15s; min-height: 178px; }
.tc:hover { border-color: var(--border-2); transform: translateY(-2px); box-shadow: var(--sh-2); }
.tc:hover .tc__go { color: var(--pri); transform: translateX(3px); }
.tc__top { display: flex; align-items: center; gap: 10px; }
.tc__n { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 11px; background: var(--card-3); font: 600 14px var(--mono); color: var(--muted); }
.tc.is-done .tc__n { background: var(--ok-soft); color: var(--ok); }
.tc__st { margin-left: auto; display: inline-flex; align-items: center; gap: 5px; font-size: 11.5px; font-weight: 600; color: var(--faint); }
.tc.is-done .tc__st { color: var(--ok); }
.tc__st svg[data-i] { width: 14px; height: 14px; }
.tc__t { font-size: 15px; font-weight: 600; line-height: 1.4; letter-spacing: -.1px; }
.tc__t mark { background: var(--pri-soft); color: var(--pri); border-radius: 3px; padding: 0 2px; }
.tc__f { margin-top: auto; display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.tc__go { margin-left: auto; color: var(--faint); transition: .15s; }
.tc__mile { grid-column: 1 / -1; display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-radius: var(--r); border: 1px dashed var(--border-2); color: var(--muted); font-size: 13.5px; flex-wrap: wrap; }
.tc__mile b { color: var(--gold); }
.tc__mile .btn { margin-left: auto; }
.empty { grid-column: 1 / -1; padding: 40px; text-align: center; color: var(--faint); border: 1px dashed var(--border-2); border-radius: var(--r-l); }

/* ===================== TOPIC PAGE ===================== */
.th { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.th__l { display: flex; gap: 18px; align-items: flex-start; min-width: 0; }
.th__no { width: 58px; height: 58px; flex: none; display: grid; place-items: center; border-radius: 16px; background: linear-gradient(135deg, var(--pri), var(--teal)); color: #fff; font: 700 22px var(--mono); box-shadow: 0 10px 24px -12px var(--pri); }
.th h1 { margin-top: 8px; font-size: clamp(21px, 2.4vw, 28px); font-weight: 700; letter-spacing: -.6px; line-height: 1.25; }
.th__act { display: flex; align-items: center; gap: 10px; flex: none; }
.pager { display: flex; gap: 6px; }
.tlayout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr); gap: 20px; align-items: start; }
.tl__side { position: sticky; top: calc(var(--tb) + 16px); }
.studio { display: flex; flex-direction: column; height: calc(100vh - var(--tb) - 40px); min-height: 520px; border-radius: var(--r-l); overflow: hidden; background: var(--card); border: 1px solid var(--border); box-shadow: var(--sh-2); }
.tabs { display: flex; gap: 4px; }
.tabs button { display: inline-flex; align-items: center; gap: 8px; height: 36px; padding: 0 12px; border: 0; border-radius: 9px; background: transparent; color: var(--muted); font-size: 13.5px; font-weight: 500; cursor: pointer; white-space: nowrap; }
.tabs button svg[data-i] { width: 16px; height: 16px; }
.tabs button:hover { color: var(--text); background: var(--card-2); }
.tabs button.is-on { color: var(--text); background: var(--card-3); }
.tabs--d { margin-bottom: 16px; padding: 4px; border-radius: 12px; background: var(--card); border: 1px solid var(--border); width: fit-content; }
.tabs--studio { padding: 8px; border-bottom: 1px solid var(--border); background: var(--card-2); }
.tabs--m { display: none; }
.pane { display: none; }
.pane.is-on { display: block; }
.studio__pane.is-on { display: flex; flex-direction: column; flex: 1; min-height: 0; }
.v3d-wrap { position: relative; flex: 1; min-height: 260px; display: flex; overflow: hidden;
  background: radial-gradient(120% 90% at 50% 30%, #1b2747 0%, #0e1528 45%, #070a13 100%); }
.v3d-wrap::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(ellipse at center, transparent 55%, rgba(0,0,0,.45)); }
.v3d { flex: 1; min-height: 0; cursor: grab; touch-action: none; }
.v3d:active { cursor: grabbing; }
.v3d-tools { position: absolute; z-index: 2; top: 12px; right: 12px; display: flex; align-items: center; gap: 2px; padding: 4px; border-radius: 12px; background: rgba(12, 17, 32, .72); border: 1px solid rgba(255,255,255,.1); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); box-shadow: 0 8px 24px -10px rgba(0,0,0,.7); }
.vt { width: 34px; height: 34px; display: grid; place-items: center; border: 0; border-radius: 9px; background: transparent; color: #b8c1da; cursor: pointer; transition: background .15s, color .15s; }
.vt:hover { background: rgba(255,255,255,.08); color: #fff; }
.vt.is-on { background: rgba(124,140,255,.22); color: #c9d0ff; }
.vt--txt { width: auto; min-width: 38px; padding: 0 8px; font: 600 12px var(--mono); }
.vt svg[data-i] { width: 17px; height: 17px; }
.vt-sep { width: 1px; height: 20px; margin: 0 3px; background: rgba(255,255,255,.12); }
.v3d-hint { position: absolute; z-index: 2; left: 12px; bottom: 10px; display: flex; gap: 12px; flex-wrap: wrap; font-size: 11.5px; color: rgba(200,208,230,.7); pointer-events: none; }
.v3d-hint kbd { background: rgba(12,17,32,.7); border-color: rgba(255,255,255,.14); color: #c9d0e6; margin-right: 4px; }
#v3Pane:fullscreen { background: #070a13; }
#v3Pane:fullscreen .info3d { max-height: 22%; background: rgba(12,17,32,.9); }
.info3d { flex: none; max-height: 34%; overflow: auto; padding: 12px 16px; border-top: 1px solid var(--border); font-size: 13.5px; line-height: 1.65; color: var(--muted); }
.info3d b { color: var(--text); font-weight: 600; }
.info3d .big { display: inline-block; margin: 2px 4px; padding: 1px 8px; border-radius: 6px; background: rgba(var(--bg-f1), .14); color: var(--gold); font: 500 12.5px var(--mono); }
.info3d .hl { color: var(--pri); font-weight: 600; }
.info3d > span:not(.big):not(.mx):not(.hl) { color: var(--faint); font: 500 12px var(--mono); }
.mx { display: inline-grid; grid-template-columns: repeat(var(--cols, 3), auto); gap: 0 9px; vertical-align: middle; margin: 2px 6px; padding: 1px 7px; border-left: 1.5px solid var(--text); border-right: 1.5px solid var(--text); border-radius: 4px; font: 500 11.5px/1.5 var(--mono); color: var(--text); }
.mx i { font-style: normal; text-align: right; }
.mx.p { border-color: #d77a86; } .mx.c { border-color: #56b6a6; } .mx.y { border-color: #c9a24a; }
.sbar { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--border); }
.sbar b { flex: 1; min-width: 0; font-size: 13.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#tPdf, #viewerFrame { flex: 1; width: 100%; border: 0; background: #3b3f45; }
/* ---------- code editor (Palenight / GitHub Light) ---------- */
.ed { --ed-bg: #1f2337; --ed-bar: #191c2e; --ed-gut: #171a2b; --ed-ln: #4f5677; --ed-tx: #c8d0ef; --ed-hl: rgba(130,170,255,.07); --ed-bd: rgba(255,255,255,.07);
  --tk-com: #7c86ad; --tk-str: #c3e88d; --tk-kw: #c792ea; --tk-fn: #82aaff; --tk-num: #f78c6c; --tk-op: #89ddff; --tk-pun: #a6accd; --tk-bool: #ff9cac;
  flex: 1; min-height: 0; display: flex; flex-direction: column; background: var(--ed-bg); }
:root[data-theme="light"] .ed { --ed-bg: #ffffff; --ed-bar: #f6f8fa; --ed-gut: #f6f8fa; --ed-ln: #a2abba; --ed-tx: #1f2328; --ed-hl: rgba(84,174,255,.08); --ed-bd: #e3e7ee;
  --tk-com: #6e7781; --tk-str: #0a3069; --tk-kw: #cf222e; --tk-fn: #8250df; --tk-num: #0550ae; --tk-op: #0550ae; --tk-pun: #57606a; --tk-bool: #0550ae; }
.ed__bar { display: flex; align-items: center; gap: 8px; padding: 0 10px 0 0; height: 46px; background: var(--ed-bar); border-bottom: 1px solid var(--ed-bd); }
.ed__tab { display: flex; align-items: center; gap: 8px; align-self: stretch; padding: 0 16px; background: var(--ed-bg); border-right: 1px solid var(--ed-bd); box-shadow: inset 0 2px 0 var(--pri); font: 500 12.5px var(--mono); color: var(--ed-tx); white-space: nowrap; }
.pylogo { width: 16px; height: 16px; flex: none; }
.ed__meta { font: 400 11.5px var(--mono); color: var(--ed-ln); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ed__sp { flex: 1; }
.ed .btn--ghost { color: var(--ed-tx); border-color: var(--ed-bd); }
.ed .btn--ghost:hover { background: var(--ed-hl); }
.btn--run { background: linear-gradient(180deg, #34c38f, #22a875); color: #06231a; border-color: transparent; box-shadow: 0 6px 16px -8px #22a875; }
.btn--run:hover { filter: brightness(1.06); }
.btn--run.is-busy svg { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.code { flex: 1; min-height: 0; margin: 0; overflow: auto; padding: 14px 0; background: var(--ed-bg); color: var(--ed-tx); font: 400 13.2px/1.72 var(--mono); tab-size: 4; counter-reset: ln; }
.code code { display: block; min-width: max-content; font: inherit; white-space: pre; }
.code .ln { display: block; padding: 0 20px 0 0; counter-increment: ln; }
.code .ln::before { content: counter(ln); display: inline-block; width: 3.4em; margin-right: 18px; padding-right: 10px; text-align: right; color: var(--ed-ln); background: var(--ed-gut); border-right: 1px solid var(--ed-bd); user-select: none; }
.code .ln:hover { background: var(--ed-hl); }
.code .ln:hover::before { color: var(--ed-tx); }
.token.comment { color: var(--tk-com); font-style: italic; }
.token.string, .token.triple-quoted-string { color: var(--tk-str); }
.token.keyword { color: var(--tk-kw); }
.token.builtin, .token.function, .token.class-name { color: var(--tk-fn); }
.token.number { color: var(--tk-num); }
.token.boolean { color: var(--tk-bool); }
.token.operator { color: var(--tk-op); }
.token.punctuation { color: var(--tk-pun); }
.token.decorator, .token.string-interpolation .interpolation { color: var(--tk-op); }
/* natija paneli */
.out { flex: none; max-height: 55%; display: flex; flex-direction: column; border-top: 1px solid var(--ed-bd); background: var(--ed-bar); }
.out[hidden] { display: none; }
.out__bar { display: flex; align-items: center; gap: 8px; padding: 6px 8px 6px 14px; border-bottom: 1px solid var(--ed-bd); color: var(--ed-tx); font-size: 12.5px; }
.out__bar svg[data-i] { width: 15px; height: 15px; color: var(--ed-ln); }
.out__st { margin-left: 6px; font: 500 11.5px var(--mono); color: var(--ed-ln); }
.out__st.ok { color: #34c38f; } .out__st.err { color: var(--bad); }
.out__bar .ib { margin-left: auto; }
.ib--xs { width: 28px; height: 28px; border-radius: 7px; }
.out__body { overflow: auto; padding: 10px 14px 14px; }
.out__txt { margin: 0 0 10px; font: 400 12.5px/1.6 var(--mono); color: var(--ed-tx); white-space: pre-wrap; }
.out__imgs { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.out__imgs figure { margin: 0; border-radius: 10px; overflow: hidden; background: #fff; border: 1px solid var(--ed-bd); }
.out__imgs img { display: block; width: 100%; height: auto; }
.out__imgs figcaption { padding: 6px 10px; font: 500 11px var(--mono); color: #57606a; border-top: 1px solid #eaeef2; }

/* resources */
.rg { margin-bottom: 22px; }
.rg__h { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; font-size: 12px; font-weight: 600; letter-spacing: .5px; text-transform: uppercase; color: var(--faint); }
.rg__h::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.res { width: 100%; display: grid; grid-template-columns: 42px 1fr auto; gap: 14px; align-items: center; padding: 12px 14px; margin-bottom: 8px; text-align: left; border-radius: 14px; border: 1px solid var(--border); background: var(--card); box-shadow: var(--sh-1); cursor: pointer; transition: border-color .15s, background .15s, transform .1s; }
.res:hover { border-color: var(--border-2); background: var(--card-2); }
.res:active { transform: translateY(1px); }
.res.is-on { border-color: var(--pri); background: var(--pri-soft); }
.res__ic { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 11px; background: var(--c-soft, var(--pri-soft)); color: var(--c, var(--pri)); }
.res__ic svg[data-i] { width: 20px; height: 20px; }
.res__t { display: block; font-weight: 600; font-size: 14px; line-height: 1.35; }
.res__s { display: block; margin-top: 2px; font-size: 12.5px; color: var(--muted); }
.res__m { font: 500 11.5px var(--mono); color: var(--faint); white-space: nowrap; text-align: right; }
.res__m b { display: block; color: var(--pri); font-weight: 600; }
.qref { display: grid; gap: 6px; }
.qref div { display: flex; gap: 10px; align-items: baseline; padding: 9px 12px; border-radius: 10px; background: var(--card-2); border: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.qref b { flex: none; font: 600 11.5px var(--mono); color: var(--rose); }

/* note */
.note { padding: 26px 28px; border-radius: var(--r-l); background: var(--card); border: 1px solid var(--border); box-shadow: var(--sh-1); font: 400 16px/1.72 var(--serif); color: var(--text); }
.note .lead { font-size: 17px; color: var(--muted); font-style: italic; margin-bottom: 16px; }
.note p { margin: 0 0 12px; }
.note ul, .note ol { margin: 8px 0 14px; padding-left: 22px; }
.note li { margin-bottom: 4px; }
.note .def, .note .thm, .note .ex { margin: 14px 0; padding: 14px 16px; border-radius: 10px; background: var(--card-2); border: 1px solid var(--border); border-left: 3px solid var(--pri); }
.note .thm { border-left-color: var(--gold); background: color-mix(in srgb, var(--gold) 7%, var(--card-2)); }
.note .ex { border-left-color: var(--ok); }
.note .def > b:first-child, .note .thm > b:first-child, .note .ex > b:first-child { font: 600 11.5px var(--sans); letter-spacing: .5px; text-transform: uppercase; color: var(--muted); margin-right: 6px; }
.note .katex-display { margin: 10px 0; overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.note-src { display: flex; gap: 8px; align-items: flex-start; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--border); font: 400 12.5px/1.5 var(--sans); color: var(--faint); }

/* ===================== GRADING ===================== */
.split { display: flex; height: 52px; border-radius: var(--r); overflow: hidden; margin-bottom: 18px; border: 1px solid var(--border); box-shadow: var(--sh-1); }
.split div { display: flex; align-items: center; gap: 10px; padding: 0 16px; background: var(--c); color: #0b1020; font-size: 13.5px; font-weight: 600; white-space: nowrap; overflow: hidden; }
.split b { font-size: 20px; font-weight: 800; }
.part { border-top: 3px solid var(--c); }
.part__top { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; }
.part__pct { font-size: 30px; font-weight: 800; letter-spacing: -1px; color: var(--c); }
.part__name { font-weight: 600; }
.part__sub { font-size: 12px; color: var(--faint); }
.part p { font-size: 13.5px; color: var(--muted); }
.calc { display: grid; grid-template-columns: 1.4fr .6fr; gap: 28px; }
.sliders { display: grid; gap: 18px; margin-bottom: 18px; }
.sl__row { display: flex; justify-content: space-between; gap: 10px; font-size: 14px; font-weight: 500; }
.sl__row span { color: var(--faint); font-weight: 400; }
.sl__row output { font: 600 13px var(--mono); padding: 2px 8px; border-radius: 6px; background: var(--card-3); }
.sl input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 6px; margin-top: 10px; border-radius: 6px; background: linear-gradient(90deg, var(--col) var(--p, 0%), var(--card-3) var(--p, 0%)); cursor: pointer; }
.sl input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%; background: #fff; border: 3px solid var(--col); box-shadow: 0 2px 6px rgba(0,0,0,.35); }
.sl input[type=range]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid var(--col); }
.sl input:disabled { opacity: .35; }
.formula { display: flex; flex-wrap: wrap; gap: 6px; }
.formula code { font-size: 12px; padding: 5px 9px; border-radius: 7px; background: var(--card-2); border: 1px solid var(--border); color: var(--muted); }
.calc__r { display: flex; flex-direction: column; align-items: center; gap: 14px; padding: 20px; border-radius: var(--r); background: var(--card-2); border: 1px solid var(--border); }
.gauge { position: relative; width: 156px; }
.gauge svg { display: block; transform: rotate(-90deg); }
.gauge circle { fill: none; stroke-width: 9; }
.gauge .bg { stroke: var(--card-3); }
.gauge .fg { stroke: var(--gcol, var(--pri)); stroke-linecap: round; stroke-dasharray: 326.7; stroke-dashoffset: 326.7; transition: stroke-dashoffset .5s, stroke .3s; }
.gauge__v { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.gauge__v b { font-size: 40px; font-weight: 800; letter-spacing: -1.5px; line-height: 1; }
.gauge__v small { font-size: 11.5px; color: var(--faint); }
.grade { display: flex; align-items: center; gap: 12px; }
.grade__l { width: 50px; height: 50px; display: grid; place-items: center; border-radius: 14px; background: var(--gcol, var(--pri)); color: #0b1020; font-size: 20px; font-weight: 800; }
.grade b { display: block; }
.grade small { font: 500 12px var(--mono); color: var(--faint); }
.checks { list-style: none; margin: 0; padding: 0; width: 100%; display: grid; gap: 6px; }
.checks li { display: flex; gap: 8px; align-items: flex-start; padding: 8px 10px; border-radius: 9px; background: var(--card); border: 1px solid var(--border); font-size: 12.5px; color: var(--muted); }
.checks li svg[data-i] { width: 15px; height: 15px; margin-top: 2px; }
.checks .ok svg { color: var(--ok); } .checks .no svg { color: var(--bad); }
.table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13.5px; }
.table th { text-align: left; padding: 10px 12px; font-size: 11.5px; font-weight: 600; letter-spacing: .4px; text-transform: uppercase; color: var(--faint); background: var(--card-2); border-bottom: 1px solid var(--border); }
.table th:first-child { border-radius: 10px 0 0 0; } .table th:last-child { border-radius: 0 10px 0 0; }
.table td { padding: 12px; border-bottom: 1px solid var(--border); color: var(--muted); vertical-align: top; }
.table tbody tr:hover td { background: var(--card-2); }
.grades td:first-child { width: 64px; }
.gl { display: inline-grid; place-items: center; min-width: 38px; height: 30px; padding: 0 8px; border-radius: 8px; background: color-mix(in srgb, var(--gc) 18%, transparent); color: var(--gc); font-weight: 800; }
.grades td.m { font-family: var(--mono); font-size: 12.5px; white-space: nowrap; color: var(--text); }
.grades tr.is-on td { background: color-mix(in srgb, var(--gc) 9%, transparent); }
.grades tr.is-on td:first-child { box-shadow: inset 3px 0 0 var(--gc); }
.tscroll { overflow-x: auto; }

/* ===================== CONTROL ===================== */
.bank { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.bank__main { display: flex; gap: 16px; padding: 22px; text-align: left; border: 0; background: none; cursor: pointer; width: 100%; }
.bank__main:hover .bank__ic { transform: scale(1.04); }
.bank__ic { width: 52px; height: 52px; flex: none; display: grid; place-items: center; border-radius: 14px; background: var(--c-soft); color: var(--c); transition: .15s; }
.bank__ic svg[data-i] { width: 26px; height: 26px; }
.bank__k { font-size: 12px; font-weight: 600; color: var(--c); text-transform: uppercase; letter-spacing: .5px; }
.bank__t { display: block; margin: 4px 0 12px; font-size: 18px; font-weight: 700; letter-spacing: -.3px; line-height: 1.3; }
.bank__body { flex: 1; min-width: 0; }
.bank__more { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 22px; border: 0; border-top: 1px solid var(--border); background: var(--card-2); cursor: pointer; font-size: 13.5px; font-weight: 500; color: var(--muted); }
.bank__more:hover { color: var(--text); }
.bank__more svg { transition: transform .2s; }
.bank.is-open .bank__more svg { transform: rotate(180deg); }
.bank__drawer { display: none; padding: 14px 18px 18px; border-top: 1px solid var(--border); }
.bank.is-open .bank__drawer { display: block; }
.qprog-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; font-size: 12.5px; color: var(--muted); }
.qprog-row .bar { flex: 1; }
.qlist { list-style: none; margin: 0; padding: 0; max-height: 320px; overflow: auto; display: grid; gap: 4px; }
.q { display: grid; grid-template-columns: auto 28px 1fr; gap: 10px; align-items: center; padding: 9px 10px; border-radius: 9px; cursor: pointer; font-size: 13.5px; border: 1px solid transparent; }
.q:hover { background: var(--card-2); }
.q input { width: 16px; height: 16px; margin: 0; accent-color: var(--ok); }
.q__n { font: 500 11.5px var(--mono); color: var(--faint); }
.q.is-done span:last-child { color: var(--faint); text-decoration: line-through; }
.q.is-pick { border-color: var(--gold); background: rgba(var(--bg-f1), .1); }
.roll { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.roll__box { flex: 1; min-height: 40px; display: flex; align-items: center; padding: 8px 12px; border-radius: 10px; border: 1px dashed var(--border-2); font-size: 13.5px; font-weight: 500; }
.doc { display: flex; flex-direction: column; gap: 10px; }
.doc__ic { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 11px; background: var(--ok-soft); color: var(--ok); }
.doc h3 { font-size: 15.5px; font-weight: 600; }
.doc p { font-size: 13px; color: var(--muted); }
.doc .chips { margin-top: auto; }

/* ===================== LIBRARY ===================== */
.book { display: grid; grid-template-columns: 76px 1fr; gap: 16px; align-items: start; }
.book[disabled] { opacity: .6; cursor: default; }
.book[disabled]:hover { transform: none; box-shadow: var(--sh-1); border-color: var(--border); }
.spine { position: relative; aspect-ratio: 3 / 4.2; border-radius: 3px 8px 8px 3px; overflow: hidden; background: linear-gradient(160deg, hsl(var(--h) 38% 46%), hsl(var(--h) 40% 22%)); box-shadow: inset 6px 0 0 rgba(0,0,0,.22), 0 10px 20px -10px rgba(0,0,0,.6); }
.spine::before { content: ""; position: absolute; left: 14px; right: 10px; top: 16%; height: 2px; background: rgba(255,255,255,.55); box-shadow: 0 6px 0 rgba(255,255,255,.3); }
.spine i { position: absolute; left: 14px; right: 6px; bottom: 9px; font: italic 600 12px/1.15 var(--serif); color: rgba(255,255,255,.85); }
.book__a { display: block; font-size: 12px; color: var(--muted); }
.book__t { display: block; margin: 4px 0; font-size: 15.5px; font-weight: 600; line-height: 1.3; }
.book__p { display: block; font-size: 12px; color: var(--faint); }
.book .chips { margin-top: 10px; }
.site { display: flex; gap: 12px; align-items: flex-start; }
.site__ic { width: 34px; height: 34px; flex: none; display: grid; place-items: center; border-radius: 10px; background: var(--pri-soft); color: var(--pri); }
.site__ic svg[data-i] { width: 16px; height: 16px; }
.site b { display: block; font: 600 13px var(--mono); }
.site span { display: block; font-size: 12.5px; color: var(--muted); line-height: 1.45; margin-top: 2px; }

/* ===================== CONTACT ===================== */
.contact { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); align-items: start; }
.prof { grid-row: span 2; display: flex; flex-direction: column; gap: 18px; }
.prof__h { display: flex; align-items: center; gap: 16px; }
.prof__h .avatar { width: 64px; height: 64px; border-radius: 20px; font-size: 21px; }
.prof__h small { display: block; font-size: 12.5px; color: var(--faint); }
.prof__h b { display: block; font-size: 18px; font-weight: 700; letter-spacing: -.3px; line-height: 1.3; }
.prof__acts { display: flex; gap: 8px; flex-wrap: wrap; }
.kv { display: grid; gap: 8px; }
.kv div { display: flex; align-items: center; gap: 12px; padding: 11px 12px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); min-width: 0; }
.kv .ic { width: 34px; height: 34px; flex: none; display: grid; place-items: center; border-radius: 10px; background: var(--card); color: var(--pri); border: 1px solid var(--border); }
.kv .ic svg[data-i] { width: 16px; height: 16px; }
.kv small { display: block; font-size: 11.5px; color: var(--faint); }
.kv b { display: block; font-size: 14px; font-weight: 600; overflow-wrap: anywhere; }
.kv a.v { color: var(--pri); font-weight: 600; overflow-wrap: anywhere; }
.week { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
.week span { display: grid; place-items: center; height: 40px; border-radius: 10px; border: 1px solid var(--border); font-size: 12.5px; font-weight: 600; color: var(--faint); }
.week span.on { background: var(--pri); border-color: var(--pri); color: var(--pri-ink); }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.list li { display: flex; gap: 12px; align-items: flex-start; padding: 12px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); font-size: 13.5px; }
.list li .avatar { width: 36px; height: 36px; border-radius: 10px; font-size: 12.5px; }
.list b { display: block; font-weight: 600; }
.list span { color: var(--muted); font-size: 12.5px; }
.list time { flex: none; font: 600 11.5px var(--mono); padding: 5px 8px; border-radius: 7px; background: var(--ok-soft); color: var(--ok); }
.signs { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.sign { padding: 16px; border-radius: var(--r); background: var(--card); border: 1px solid var(--border); box-shadow: var(--sh-1); }
.sign::before { content: ""; display: block; height: 22px; border-bottom: 1px dashed var(--border-2); margin-bottom: 10px; }
.sign b { display: block; font-size: 14px; font-weight: 600; }
.sign span { font-size: 12px; color: var(--faint); }

/* ===================== MODALS ===================== */
.modal { position: fixed; inset: 0; z-index: 100; display: none; }
.modal.is-open { display: block; }
.modal__bg { position: absolute; inset: 0; background: rgba(5, 8, 16, .62); backdrop-filter: blur(4px); animation: fade .2s; }
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: translateY(10px) scale(.985); } }
.palette { position: absolute; left: 50%; top: 12vh; transform: translateX(-50%); width: min(640px, calc(100% - 24px)); border-radius: 16px; overflow: hidden; background: var(--card); border: 1px solid var(--border-2); box-shadow: var(--sh-2); animation: pop .18s ease; }
.palette__in { display: flex; align-items: center; gap: 12px; padding: 0 16px; height: 56px; border-bottom: 1px solid var(--border); color: var(--faint); }
.palette__in input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--text); font: 500 16px var(--sans); }
.palette__list { max-height: 52vh; overflow: auto; padding: 8px; }
.pg { padding: 8px 10px 4px; font-size: 11px; font-weight: 600; letter-spacing: .5px; text-transform: uppercase; color: var(--faint); }
.pi { display: flex; align-items: center; gap: 12px; width: 100%; padding: 10px 12px; border: 0; border-radius: 10px; background: transparent; text-align: left; cursor: pointer; color: var(--text); }
.pi svg[data-i] { color: var(--faint); }
.pi span { flex: 1; min-width: 0; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pi small { font: 500 11.5px var(--mono); color: var(--faint); }
.pi.is-on { background: var(--pri-soft); }
.pi.is-on svg[data-i] { color: var(--pri); }
.palette__foot { display: flex; gap: 16px; padding: 10px 16px; border-top: 1px solid var(--border); font-size: 12px; color: var(--faint); }
.palette__empty { padding: 30px; text-align: center; color: var(--faint); }
.sheet { position: absolute; inset: 24px; max-width: 1100px; margin: 0 auto; display: flex; flex-direction: column; border-radius: 18px; overflow: hidden; background: var(--card); border: 1px solid var(--border-2); box-shadow: var(--sh-2); animation: pop .22s ease; }
.sheet__h { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--border); }
.sheet__t { flex: 1; min-width: 0; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.toast { position: fixed; left: 50%; bottom: 24px; z-index: 120; transform: translate(-50%, 16px); opacity: 0; display: flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 12px; background: var(--text); color: var(--bg); font-size: 13.5px; font-weight: 500; box-shadow: var(--sh-2); transition: .22s; pointer-events: none; }
.toast.is-show { transform: translate(-50%, 0); opacity: 1; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 1360px) {
  .tgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .signs { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 1180px) {
  .hero, .viz, .next, .teacher-mini, .passport, .about { grid-column: span 12; }
  .viz__canvas { min-height: 340px; }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tlayout { grid-template-columns: 1fr; }
  .tl__side { position: static; }
  .studio { height: 640px; }
  .g3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
  .sb { transform: translateX(-105%); width: var(--sb) !important; box-shadow: var(--sh-2); }
  .is-collapsed .sb .logo__t, .is-collapsed .sb__search span, .is-collapsed .sb__search kbd, .is-collapsed .sb__label,
  .is-collapsed .sb__nav a span, .is-collapsed .sb__nav a em, .is-collapsed .sb__year { display: initial; }
  .is-collapsed .sb__progress { display: block; }
  .sb__collapse { display: none; }
  .sb-open .sb { transform: none; }
  .sb-open .sb-scrim { display: block; position: fixed; inset: 0; z-index: 55; background: rgba(5, 8, 16, .5); }
  .app, .is-collapsed .app { margin-left: 0; }
  .tb { padding: 0 16px; }
  .tb__menu { display: grid; }
  .tb__search { width: auto; }
  .tb__search span, .tb__search kbd { display: none; }
  .tb__theme { display: grid; }
  main { padding: 20px 16px 32px; }
  .g2, .calc { grid-template-columns: 1fr; }
  .tn { grid-template-columns: 1fr; }
  .tn li:last-child:nth-child(odd) { grid-column: auto; }
  .tabs--d, .tabs--studio { display: none; }
  .tabs--m { display: flex; overflow-x: auto; margin: 0 -16px 16px; padding: 0 16px 8px; border-bottom: 1px solid var(--border); scrollbar-width: none; }
  .tlayout { display: block; }
  .tl__main .pane, .studio__pane { display: none !important; }
  .tl__main .pane.is-on-m { display: block !important; }
  .studio__pane.is-on-m { display: flex !important; }
  .studio { height: auto; min-height: 0; border: 0; box-shadow: none; background: none; }
  .studio__pane { height: 72vh; border-radius: var(--r-l); overflow: hidden; border: 1px solid var(--border); background: var(--card); }
  .th { flex-direction: column; }
  .th__act { width: 100%; justify-content: space-between; }
}
@media (max-width: 640px) {
  body { font-size: 14.5px; }
  .hero { padding: 24px; }
  .viz__canvas { min-height: 280px; }
  .kpis { gap: 10px; }
  .kpi { padding: 14px; gap: 10px; }
  .kpi__ic { width: 38px; height: 38px; }
  .kpi b { font-size: 20px; }
  .pp { grid-template-columns: 1fr; }
  .hr { grid-template-columns: 100px 1fr 30px; }
  .tgrid, .g3, .g4, .contact { grid-template-columns: 1fr; }
  .next { grid-template-columns: 1fr; }
  .signs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split div span { display: none; }
  .ph { flex-direction: column; align-items: flex-start; }
  .th__no { width: 48px; height: 48px; font-size: 18px; }
  .note { padding: 18px; font-size: 15.5px; }
  .card { padding: 18px; }
  .sheet { inset: 0; border-radius: 0; }
  .hide-s { display: none; }
  .crumbs > *:not(:last-child) { display: none; }
  .mx3 { grid-template-columns: repeat(3, 4.6ch); font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media print {
  :root { --bg: #fff; --card: #fff; --card-2: #fff; --card-3: #eee; --text: #000; --muted: #333; --faint: #555; --border: #ccc; --border-2: #999; --sh-1: none; --sh-2: none; color-scheme: light; }
  #bgMath, .sb, .tb, .viz, .hero__cta, .toolbar, .calc, .modal, .toast, .tl__side, .tabs, .bank__more, .th__act { display: none !important; }
  .app { margin: 0 !important; }
  .page { display: block !important; break-before: page; }
  .page:first-of-type { break-before: auto; }
  .card, .tc, .res { break-inside: avoid; }
  .hero { grid-column: span 12; }
}

/* nazariy savollar — oddiy raqamli ro‘yxat */
.qlist .q { grid-template-columns: 28px 1fr; cursor: default; }
.qlist .q:nth-child(even) { background: var(--card-2); }

/* 3×4 portretlar */
.ph34 { position: relative; flex: none; display: block; aspect-ratio: 3 / 4; overflow: hidden; border-radius: 12px; background: linear-gradient(135deg, var(--pri), var(--teal)); border: 1px solid var(--border-2); box-shadow: var(--sh-1); }
.ph34 img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 30%; }
.ph34 i { position: absolute; inset: 0; display: none; place-items: center; font-style: normal; font-weight: 700; color: #fff; letter-spacing: .5px; }
.ph34.is-err i { display: grid; }
.ph34--sm { width: 54px; border-radius: 10px; }
.ph34--sm i { font-size: 16px; }
.ph34--md { width: 96px; }
.ph34--lg { width: 120px; border-radius: 14px; }
.ph34--md i, .ph34--lg i { font-size: 26px; }
.prof__h { align-items: flex-start; }
.prof__h > div { padding-top: 6px; min-width: 0; }
.dev { grid-row: auto; }
@media (max-width: 640px) { .ph34--lg { width: 96px; } .ph34--md { width: 84px; } }

/* ===== Ma’ruza / Amaliy rejimlari ===== */
[data-page="topic"].is-lec .only-prac, [data-page="topic"].is-prac .only-lec { display: none !important; }
[data-page="topic"].is-prac .tabs--d { display: none; }
[data-page="topic"].is-lec .th__no { background: linear-gradient(135deg, var(--pri), #9aa6ff); }
[data-page="topic"].is-prac .th__no { background: linear-gradient(135deg, var(--teal), #6fe0cf); }
.tc { text-decoration: none; color: inherit; }
.tc__n { width: auto; min-width: 42px; padding: 0 8px; }
.tc--lec .tc__n { background: var(--pri-soft); color: var(--pri); }
.tc--prac .tc__n { background: rgba(60,200,180,.14); color: var(--teal); }
.tc__st { font-weight: 500; }

/* ===== Bosh sahifa: bo‘limlar ===== */
.next { display: block; }
.sects { display: grid; gap: 8px; }
.sect { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 12px; background: var(--card-2); border: 1px solid var(--border); transition: border-color .15s, background .15s; }
.sect:hover { border-color: var(--c); background: var(--card-3); }
.sect__ic { width: 36px; height: 36px; flex: none; display: grid; place-items: center; border-radius: 10px; background: color-mix(in srgb, var(--c) 16%, transparent); color: var(--c); }
.sect > span:nth-child(2) { flex: 1; min-width: 0; }
.sect b { display: block; font-weight: 600; font-size: 14px; }
.sect small { display: block; font-size: 12.5px; color: var(--muted); }
.sect > svg:last-child { color: var(--faint); }
.kpi--link { transition: border-color .15s, transform .15s; }
.kpi--link:hover { border-color: var(--border-2); transform: translateY(-2px); }

/* ===== Hujjat sahifalari (oraliq / yakuniy / mustaqil) ===== */
.docpage { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: 20px; align-items: start; }
.docinfo { display: flex; flex-direction: column; gap: 14px; }
.docinfo__h { display: flex; gap: 14px; align-items: flex-start; }
.docinfo__t { font-size: 19px; font-weight: 700; letter-spacing: -.3px; line-height: 1.3; margin: 2px 0 4px; }
.docinfo__h .muted { font-size: 13px; }
.docinfo__sh { margin-top: 6px; font-size: 12px; font-weight: 600; letter-spacing: .5px; text-transform: uppercase; color: var(--faint); }
.qlist--full { max-height: none; overflow: visible; }
.qlist--full .q { padding: 10px 12px; border-radius: 10px; font-size: 14px; line-height: 1.45; align-items: start; }
.docview { position: sticky; top: calc(var(--tb) + 16px); padding: 0; overflow: hidden; display: flex; flex-direction: column; height: calc(100vh - var(--tb) - 40px); min-height: 520px; }
.docview iframe { flex: 1; width: 100%; border: 0; background: #3b3f45; }
.mtlist { display: grid; gap: 8px; }
.mtlist .res { margin: 0; }
.mtn { font-size: 16px; font-weight: 800; }
@media (max-width: 1180px) {
  .docpage { grid-template-columns: 1fr; }
  .docview { position: static; height: 76vh; }
}

/* ==========================================================
   Ixcham zichlik — bo‘sh joylarni kamaytirish
   ========================================================== */
:root { --tb: 54px; --sb: 248px; --r: 12px; --r-l: 14px; }
main { max-width: 1480px; padding: 16px 22px 24px; }
.tb { padding: 0 22px; }
.tb__search { height: 34px; }

/* sidebar */
.sb { gap: 10px; padding: 12px 10px; }
.sb__search { height: 36px; }
.sb__label { margin: 4px 10px 2px; font-size: 10.5px; }
.sb__nav { gap: 1px; }
.sb__nav a { height: 34px; padding: 0 10px; gap: 10px; font-size: 13.5px; }
.sb__nav a.is-on::before { left: -10px; top: 8px; bottom: 8px; }
.sb__foot { padding-top: 8px; }

/* umumiy */
.grid { gap: 12px; }
.card { padding: 16px; }
.card__h { margin-bottom: 10px; }
.card__h h2 { font-size: 15.5px; }
.ph { margin-bottom: 12px; gap: 12px; }
.ph h1 { font-size: clamp(22px, 2.4vw, 28px); }
.ph p { margin-top: 2px; font-size: 13.5px; }
.sh { margin: 20px 0 10px; }
.lead { margin-bottom: 12px; }
.mt { margin-top: 12px; }
.foot { margin-top: 24px; padding-top: 14px; }
.chip { height: 24px; padding: 0 9px; font-size: 12px; }
.btn { height: 36px; padding: 0 14px; }

/* bosh sahifa */
.hero { padding: 22px 24px; gap: 10px; }
.hero__t { font-size: clamp(32px, 4vw, 50px); }
.hero__s { font-size: 14.5px; }
.hero__cta { margin-top: 2px; }
.viz__canvas { min-height: 250px; }
.viz__bar, .viz__hud { padding: 8px 12px; }
.kpis { gap: 12px; }
.kpi { padding: 12px 14px; gap: 12px; }
.kpi__ic { width: 38px; height: 38px; border-radius: 10px; }
.kpi b { font-size: 21px; }
.sects { gap: 6px; }
.sect { padding: 8px 12px; }
.sect__ic { width: 32px; height: 32px; }
.teacher-mini { gap: 10px; }
.pp { gap: 6px; }
.pp div { padding: 7px 11px; gap: 1px; }
.hours { gap: 6px; padding-top: 10px; }
.tn { gap: 6px; }
.tn li { padding: 8px 12px; gap: 10px; }

/* ro‘yxatlar */
.toolbar { margin-bottom: 12px; }
.field { height: 38px; }
.tgrid { gap: 10px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.tc { min-height: 0; padding: 12px 14px; gap: 8px; }
.tc__n { height: 30px; min-width: 38px; border-radius: 8px; font-size: 13px; }
.tc__t { font-size: 14px; }

/* mavzu sahifasi */
.th { margin-bottom: 12px; gap: 12px; }
.th__l { gap: 12px; }
.th__no { width: 48px; height: 48px; font-size: 16px; border-radius: 12px; }
.th h1 { margin-top: 4px; font-size: clamp(18px, 2vw, 23px); }
.tlayout { gap: 14px; }
.tl__side { top: calc(var(--tb) + 10px); }
.studio { height: calc(100vh - var(--tb) - 24px); }
.tabs--d { margin-bottom: 10px; }
.tabs button { height: 32px; }
.tabs--studio { padding: 6px; }
.rg { margin-bottom: 12px; }
.rg__h { margin-bottom: 6px; }
.res { padding: 9px 12px; margin-bottom: 6px; gap: 12px; grid-template-columns: 36px 1fr auto; }
.res__ic { width: 36px; height: 36px; border-radius: 9px; }
.note { padding: 18px 20px; }
.info3d { padding: 8px 12px; }

/* hujjat sahifalari */
.docpage { gap: 14px; }
.docinfo { gap: 10px; }
.docview { top: calc(var(--tb) + 10px); height: calc(100vh - var(--tb) - 24px); }
.qlist--full .q { padding: 7px 10px; }

/* baholash */
.split { height: 44px; margin-bottom: 12px; }
.part__pct { font-size: 26px; }
.calc { gap: 18px; }
.sliders { gap: 12px; margin-bottom: 12px; }
.calc__r { padding: 14px; gap: 10px; }
.gauge { width: 132px; }
.table td { padding: 8px 10px; }
.table th { padding: 8px 10px; }

/* kutubxona, aloqa */
.book { grid-template-columns: 62px 1fr; gap: 12px; }
.prof { gap: 12px; }
.kv { gap: 6px; }
.kv div { padding: 8px 10px; }
.list { gap: 6px; }
.list li { padding: 9px 10px; }
.signs { gap: 8px; }
.sign { padding: 12px; }
.sign::before { height: 14px; margin-bottom: 6px; }

@media (max-width: 960px) { main { padding: 12px 12px 20px; } .tb { padding: 0 12px; } }