/* ===================== Кортеж — стилове ===================== */
:root {
  --paper: #F1F4F9;
  --surface: #FFFFFF;
  --surface-2: #F7F9FC;
  --ink: #1C2541;
  --ink-2: #4A5470;
  --ink-3: #6E7893;
  --rule: #CBD3DF;
  --rule-soft: #E3E8F0;
  --mark: #FFE45C;
  --mark-soft: #FFF6C4;
  --mark-ink: #1C2541;
  --ok: #1F8A52;
  --ok-soft: #E2F4EA;
  --bad: #C8414B;
  --bad-soft: #FBE7E8;
  --code-bg: #1C2541;
  --code-ink: #E8ECF5;
  --top: #1C2541;
  --shadow: 0 1px 2px rgba(28, 37, 65, .06), 0 4px 14px rgba(28, 37, 65, .06);
  --accent: #2F6FEB;
  --radius: 10px;
  --radius-s: 6px;
  --mono: 'JetBrains Mono', ui-monospace, Consolas, monospace;
  --sans: 'Golos Text', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --paper: #11172A;
  --surface: #192138;
  --surface-2: #1E2742;
  --ink: #E7EBF5;
  --ink-2: #B7C0D6;
  --ink-3: #8C97B4;
  --rule: #33405F;
  --rule-soft: #26304C;
  --mark: #FFE45C;
  --mark-soft: #3B3720;
  --mark-ink: #1C2541;
  --ok: #4CC987;
  --ok-soft: #173A2A;
  --bad: #F27C84;
  --bad-soft: #3D1E25;
  --code-bg: #0D1324;
  --code-ink: #E8ECF5;
  --top: #0D1324;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 18px rgba(0, 0, 0, .25);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #11172A; --surface: #192138; --surface-2: #1E2742; --ink: #E7EBF5; --ink-2: #B7C0D6; --ink-3: #8C97B4;
    --rule: #33405F; --rule-soft: #26304C; --mark-soft: #3B3720; --ok: #4CC987; --ok-soft: #173A2A; --bad: #F27C84; --bad-soft: #3D1E25;
    --code-bg: #0D1324; --top: #0D1324; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 18px rgba(0,0,0,.25); color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--sans); }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--mark); outline-offset: 2px; border-radius: 4px; }
code, pre, .mono { font-family: var(--mono); }
code { background: var(--rule-soft); padding: .05em .35em; border-radius: 4px; font-size: .88em; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.01em; }
.hidden { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- бутони ---------- */
.btn { display: inline-flex; align-items: center; gap: .45em; border: 1.5px solid var(--ink); background: var(--surface); color: var(--ink); padding: .5em 1em; border-radius: var(--radius-s); cursor: pointer; font-weight: 500; text-decoration: none; line-height: 1.3; min-height: 2.5rem; }
.btn:hover { background: var(--mark-soft); }
.btn.primary { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.btn.primary:hover { opacity: .9; background: var(--ink); }
.btn.accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.accent:hover { filter: brightness(1.08); background: var(--accent); }
.btn.small { padding: .3em .7em; font-size: .9rem; min-height: 2.1rem; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--rule-soft); }
.btn.line { border: 1px solid var(--rule); font-weight: 400; }
.btn.line.on { border-color: var(--ink); background: var(--mark-soft); }
.btn.danger { border-color: var(--bad); color: var(--bad); }
.btn:disabled { opacity: .5; cursor: default; }
.kbd { font-family: var(--mono); font-size: .72em; opacity: .7; }

/* ---------- полета ---------- */
label.field { display: block; margin: 0 0 .9rem; font-size: .93rem; color: var(--ink-2); }
label.field input, label.field select { display: block; width: 100%; margin-top: .3rem; padding: .65em .75em; border: 1.5px solid var(--rule); border-radius: var(--radius-s); background: var(--surface); color: var(--ink); font-size: 1rem; }
label.field input:focus, label.field select:focus { border-color: var(--ink); outline: none; box-shadow: 0 0 0 3px var(--mark); }
.form-error { color: var(--bad); background: var(--bad-soft); padding: .55em .8em; border-radius: var(--radius-s); margin-bottom: .9rem; font-size: .95rem; }
.form-ok { color: var(--ok); background: var(--ok-soft); padding: .55em .8em; border-radius: var(--radius-s); margin-bottom: .9rem; font-size: .95rem; }
.hint { font-size: .86rem; color: var(--ink-3); }

/* ---------- таблици с резултати ---------- */
.rt-wrap { overflow: auto; max-height: 440px; border: 1px solid var(--rule); border-radius: var(--radius-s); background: var(--surface); }
table.rt { border-collapse: collapse; font-family: var(--mono); font-size: .84rem; width: max-content; min-width: 100%; }
table.rt th { position: sticky; top: 0; background: var(--ink); color: var(--surface); font-weight: 500; text-align: left; padding: .4em .8em; white-space: nowrap; z-index: 1; }
:root[data-theme="dark"] table.rt th { background: #2B375A; color: #fff; }
table.rt td { padding: .32em .8em; border-top: 1px solid var(--rule-soft); white-space: nowrap; transition: background .25s, opacity .25s; }
table.rt tr:nth-child(even) td { background: var(--surface-2); }
table.rt td.num { text-align: right; }
table.rt td.null { color: var(--ink-3); font-style: italic; }
.rt-meta { font-size: .82rem; color: var(--ink-3); margin: .35rem 0 0; }
table.mini { border-collapse: collapse; margin: .6rem 0 1.1rem; font-size: .93rem; }
table.mini th, table.mini td { border: 1px solid var(--rule); padding: .35em .7em; text-align: left; vertical-align: top; }
table.mini th { background: var(--rule-soft); font-weight: 600; }

.msg { padding: .6em .85em; border-radius: var(--radius-s); font-size: .95rem; margin: .55rem 0; border-left: 4px solid; }
.msg.ok { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.msg.bad { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.msg.info { background: var(--surface); border-color: var(--rule); color: var(--ink-2); }
.out { margin-top: .75rem; }

/* ---------- CodeMirror ---------- */
.CodeMirror { height: auto; min-height: 5.6em; font-family: var(--mono); font-size: 15px; line-height: 1.55; border-radius: var(--radius-s); background: var(--code-bg); color: var(--code-ink); padding: .4em 0; }
.CodeMirror-scroll { min-height: 5.6em; max-height: 360px; }
.CodeMirror-gutters { background: var(--code-bg); border-right: 1px solid #2E3A5E; }
.CodeMirror-linenumber { color: #5D6A8F; }
.CodeMirror-cursor { border-left: 2px solid var(--mark); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: #33416B !important; }
.CodeMirror-placeholder { color: #66729A !important; }
.cm-s-default .cm-keyword { color: #FFD866; font-weight: 600; }
.cm-s-default .cm-string { color: #A6E3A1; }
.cm-s-default .cm-number { color: #F5A97F; }
.cm-s-default .cm-comment { color: #7F8AAE; font-style: italic; }
.cm-s-default .cm-operator, .cm-s-default .cm-bracket { color: #CDD6F4; }
.cm-s-default .cm-builtin, .cm-s-default .cm-type { color: #89DCEB; }
.cm-s-default .cm-variable-2, .cm-s-default .cm-variable { color: #E8ECF5; }
.cm-s-default .cm-atom { color: #F5A97F; }

pre.syntax { background: var(--surface-2); border: 1px dashed var(--ink-3); border-radius: var(--radius-s); padding: .75em .95em; font-size: .88rem; overflow-x: auto; white-space: pre-wrap; }
.note { background: var(--surface-2); border-left: 4px solid var(--accent); padding: .75em 1em; border-radius: 0 var(--radius-s) var(--radius-s) 0; margin: 1rem 0; font-size: .96rem; }
.note.warn { border-color: #E0B400; background: var(--mark-soft); }
.note.beyond { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, var(--surface)); }
.tag { font-size: .7em; font-weight: 600; background: var(--mark); color: var(--mark-ink); padding: .1em .45em; border-radius: 3px; vertical-align: middle; }

/* ---------- горна лента ---------- */
.topbar { position: sticky; top: 0; z-index: 20; background: var(--top); color: #fff; display: flex; align-items: center; gap: 1rem; padding: .55rem 1.2rem; min-height: 56px; }
.topbar a { color: #fff; text-decoration: none; }
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: -.02em; display: flex; align-items: center; gap: .5rem; white-space: nowrap; }
.brand-mark { display: inline-grid; grid-template-columns: repeat(3, 7px); gap: 2px; }
.brand-mark i { width: 7px; height: 7px; background: #4C5A85; }
.brand-mark i.on { background: var(--mark); }
.topbar nav { display: flex; gap: .2rem; margin-left: auto; align-items: center; }
.topbar nav a, .topbar nav button { color: #DDE3F0; background: none; border: 0; padding: .4em .75em; border-radius: var(--radius-s); cursor: pointer; font-size: .95rem; white-space: nowrap; }
.topbar nav a:hover, .topbar nav button:hover, .topbar nav a.active { background: #2E3A5E; color: #fff; }
.who { font-size: .88rem; color: #B9C2D9; margin-right: .3rem; white-space: nowrap; }
.theme-btn { font-family: var(--mono); }

/* ---------- обща рамка ---------- */
.main { padding: 1.8rem clamp(1rem, 4vw, 3rem) 5rem; max-width: 1180px; margin: 0 auto; }
.col { max-width: 860px; margin: 0 auto; }
.card { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); box-shadow: var(--shadow); }
.pad { padding: 1.2rem 1.4rem; }
.empty { color: var(--ink-3); padding: 1.5rem; text-align: center; }
.row-flex { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.toast { position: fixed; bottom: 1.2rem; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--surface); padding: .7em 1.2em; border-radius: var(--radius-s); z-index: 60; font-size: .97rem; box-shadow: var(--shadow); }
.toast.badge { background: var(--mark); color: var(--mark-ink); font-weight: 600; }

/* ---------- начало ---------- */
.hello { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 1.4rem; margin-bottom: 2rem; }
.hello-main { padding: 1.6rem 1.8rem; }
.hello h1 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); margin: .1rem 0 .9rem; }
.bigbar { height: 14px; background: var(--rule-soft); border-radius: 999px; overflow: hidden; margin: .4rem 0 .5rem; }
.bigbar i { display: block; height: 100%; background: var(--ok); border-radius: 999px; transition: width .6s; }
.stats { display: flex; gap: 1.6rem; flex-wrap: wrap; margin-top: 1rem; }
.stats div { font-size: .88rem; color: var(--ink-3); }
.stats b { display: block; font-size: 1.6rem; color: var(--ink); font-family: var(--mono); line-height: 1.1; }
.next-card { padding: 1.4rem 1.6rem; background: color-mix(in srgb, var(--accent) 12%, var(--surface)); border-color: color-mix(in srgb, var(--accent) 45%, var(--rule)); display: flex; flex-direction: column; gap: .6rem; justify-content: center; }
.next-card .lbl { font-size: .9rem; color: var(--ink-2); }
.next-card h2 { margin: 0; font-size: 1.35rem; }

.path { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 1rem; }
.lrow { display: grid; grid-template-columns: 3rem 1fr; gap: .9rem; padding: 1rem 1.1rem; text-decoration: none; border-left: 6px solid var(--accent); transition: transform .15s; }
.lrow:hover { transform: translateY(-2px); }
.lrow.locked { opacity: .55; border-left-color: var(--rule); pointer-events: none; }
.lnum { width: 3rem; height: 3rem; border-radius: 50%; display: grid; place-items: center; background: color-mix(in srgb, var(--accent) 15%, var(--surface)); color: var(--accent); font-weight: 700; font-size: 1.15rem; font-family: var(--mono); }
.lrow.done .lnum { background: var(--accent); color: #fff; }
.lrow h3 { margin: 0 0 .15rem; font-size: 1.05rem; }
.lrow .meta { font-size: .82rem; color: var(--ink-3); }
.minibar { height: 6px; background: var(--rule-soft); border-radius: 999px; overflow: hidden; margin: .55rem 0 .35rem; }
.minibar i { display: block; height: 100%; background: var(--accent); }
.lsteps { display: flex; gap: .7rem; font-size: .8rem; color: var(--ink-3); flex-wrap: wrap; }
.lsteps .y { color: var(--ok); font-weight: 600; }
.section-title { font-size: 1.3rem; margin: 2.2rem 0 1rem; }
.side-boxes { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; margin-top: 2rem; }
.board ol { margin: 0; padding: .3rem 0; list-style: none; counter-reset: r; }
.board li { counter-increment: r; display: grid; grid-template-columns: 2rem 1fr auto; padding: .35rem 1.1rem; font-size: .95rem; }
.board li::before { content: counter(r); font-family: var(--mono); color: var(--ink-3); }
.board li.me { background: var(--mark); color: var(--mark-ink); font-weight: 600; }
.board li.me::before { color: var(--mark-ink); }
.board li span:last-child { font-family: var(--mono); }
.box-h { margin: 0; padding: .9rem 1.1rem; border-bottom: 1px solid var(--rule); font-size: 1rem; }

/* ---------- значки ---------- */
.badges { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .9rem; }
.badge { text-align: center; padding: 1rem .6rem; }
.medal { width: 64px; height: 64px; margin: 0 auto .5rem; border-radius: 50%; display: grid; place-items: center; font-weight: 800; font-size: 1.15rem; font-family: var(--mono); color: #fff; background: var(--accent); box-shadow: inset 0 -4px 0 rgba(0,0,0,.18), 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent); }
.badge.off .medal { background: var(--rule); color: var(--ink-3); box-shadow: none; }
.badge.off { opacity: .7; }
.badge b { display: block; font-size: .92rem; }
.badge .d { display: block; font-size: .78rem; color: var(--ink-3); line-height: 1.35; margin-top: .2rem; }
.badge-row { display: flex; gap: .5rem; flex-wrap: wrap; }
.badge-row .medal { width: 40px; height: 40px; font-size: .8rem; margin: 0; box-shadow: none; }

/* ---------- урок ---------- */
.lhead { padding: 1.4rem 1.6rem 0; border-top: 6px solid var(--accent); border-radius: var(--radius) var(--radius) 0 0; }
.lhead .sub { margin: 0; font-size: .9rem; color: var(--ink-3); }
.lhead h1 { margin: .25rem 0 .2rem; font-size: clamp(1.5rem, 3vw, 2.1rem); }
.lhead .prog { font-size: .88rem; color: var(--ink-2); margin: 0 0 1rem; }
.lhead .prog b { color: var(--accent); font-weight: 600; }
.stepper { display: flex; gap: 0; overflow-x: auto; border-top: 1px solid var(--rule-soft); margin: 0 -1.6rem; padding: 0 1rem; scrollbar-width: thin; }
.stepper a { display: flex; align-items: center; gap: .55rem; padding: .85rem .9rem; text-decoration: none; color: var(--ink-2); border-bottom: 3px solid transparent; white-space: nowrap; font-size: .95rem; }
.stepper a:hover { color: var(--ink); background: var(--surface-2); }
.stepper a.on { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }
.stepper .dot { width: 1.6rem; height: 1.6rem; border-radius: 50%; display: grid; place-items: center; font-size: .8rem; font-family: var(--mono); border: 2px solid var(--rule); color: var(--ink-3); }
.stepper a.on .dot { border-color: var(--accent); color: var(--accent); }
.stepper a.done .dot { background: var(--accent); border-color: var(--accent); color: #fff; }
.stepper .cnt { font-size: .78rem; color: var(--ink-3); font-family: var(--mono); }
.lbody { padding: 1.5rem 1.6rem 1.8rem; }
.theory h3 { margin: 1.8rem 0 .6rem; font-size: 1.25rem; }
.theory h3:first-child { margin-top: .4rem; }
.theory p, .theory li { max-width: 72ch; }
.steps-nav { display: flex; gap: .6rem; justify-content: space-between; align-items: center; margin-top: 1.8rem; padding-top: 1.2rem; border-top: 1px solid var(--rule-soft); flex-wrap: wrap; }

.example { margin: .8rem 0 1.4rem; }
.example .bar { display: flex; gap: .5rem; align-items: center; margin-top: .45rem; flex-wrap: wrap; }
.params { display: flex; flex-wrap: wrap; gap: .5rem; margin: .5rem 0 0; }
.params label { display: flex; align-items: center; gap: .35rem; font-family: var(--mono); font-size: .86rem; background: var(--mark-soft); border: 1px solid #E6CF4A; padding: .25em .3em .25em .6em; border-radius: var(--radius-s); }
.params input { width: 9em; border: 1px solid var(--rule); border-radius: 4px; padding: .25em .45em; font-family: var(--mono); font-size: .86rem; background: var(--surface); }

/* задачи: навигация */
.chips-nav { display: flex; gap: .35rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.chips-nav a { min-width: 2.4rem; height: 2.4rem; padding: 0 .5rem; display: grid; place-items: center; border-radius: var(--radius-s); border: 1.5px solid var(--rule); text-decoration: none; font-family: var(--mono); font-size: .88rem; background: var(--surface); color: var(--ink-2); }
.chips-nav a:hover { border-color: var(--ink-3); }
.chips-nav a.ok { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); font-weight: 700; }
.chips-nav a.bad { background: var(--bad-soft); border-color: var(--bad); color: var(--bad); }
.chips-nav a.cur { outline: 3px solid var(--accent); outline-offset: 1px; color: var(--ink); }
.chips-nav a.bonus { border-style: dashed; }
.chips-nav .sep { width: 1px; background: var(--rule); margin: 0 .3rem; }

.task-top { display: flex; align-items: baseline; gap: .7rem; flex-wrap: wrap; margin-bottom: .2rem; }
.task-top .no { font-size: .88rem; color: var(--ink-3); }
.task-top h2 { margin: 0; font-size: 1.35rem; }
.task-top .state { margin-left: auto; font-size: .88rem; color: var(--ink-3); }
.task-top .state.ok { color: var(--ok); font-weight: 600; }
.star { color: #B08D00; font-size: .88rem; font-weight: 600; }
:root[data-theme="dark"] .star { color: #FFD866; }
.task-text { font-size: 1.04rem; margin: .5rem 0 1rem; }
.tools { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: .7rem; }
.panel { background: var(--surface-2); border: 1px solid var(--rule-soft); border-radius: var(--radius-s); padding: .8rem .9rem; margin: 0 0 .8rem; }
.panel h4 { margin: 0 0 .4rem; font-size: .92rem; }
.hint-box { border-left: 4px solid #E0B400; background: var(--mark-soft); }
.hint-box pre { margin: .4rem 0 0; white-space: pre-wrap; font-size: .86rem; }
.actions { display: flex; gap: .5rem; margin-top: .7rem; flex-wrap: wrap; align-items: center; }
.task-nav { display: flex; justify-content: space-between; gap: .6rem; margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--rule-soft); flex-wrap: wrap; }
.choices { display: grid; gap: .5rem; margin: .5rem 0 .3rem; }
.choices label { display: flex; gap: .7rem; align-items: flex-start; padding: .7em .9em; border: 1.5px solid var(--rule); border-radius: var(--radius-s); cursor: pointer; background: var(--surface); }
.choices label:hover { border-color: var(--ink-3); }
.choices input { margin-top: .35em; accent-color: var(--accent); }
.choices label.picked { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, var(--surface)); }

/* структура на базата */
.schema { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: .6rem; }
.schema .tbl { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius-s); font-size: .82rem; overflow: hidden; }
.schema .tbl b { display: block; background: var(--ink); color: var(--surface); padding: .35em .6em; font-weight: 600; }
:root[data-theme="dark"] .schema .tbl b { background: #2B375A; color: #fff; }
.schema .tbl b span { font-weight: 400; opacity: .7; font-size: .9em; }
.schema .tbl div { padding: .18em .6em; font-family: var(--mono); display: flex; justify-content: space-between; gap: .5rem; border-top: 1px solid var(--rule-soft); }
.schema .tbl div em { color: var(--ink-3); font-style: normal; }
.schema .tbl div.pk { font-weight: 700; }
.schema .tbl div.pk::after { content: 'ключ'; font-family: var(--sans); font-size: .8em; color: var(--mark-ink); background: var(--mark); padding: 0 .3em; border-radius: 3px; }

/* тетрадка */
.notebook { background: var(--surface); background-image: repeating-linear-gradient(to bottom, transparent 0, transparent 1.95rem, color-mix(in srgb, var(--accent) 22%, transparent) 1.95rem, color-mix(in srgb, var(--accent) 22%, transparent) 2rem); border-left: 3px solid #E57373; padding: .4rem 1.4rem .4rem 2.2rem; border-radius: var(--radius-s); line-height: 2rem; }
.notebook ol { margin: 0; padding-left: 1.1rem; }
.notebook li { font-size: 1.02rem; }
.terms dt { font-weight: 700; margin-top: .7rem; }
.terms dd { margin: .1rem 0 0; color: var(--ink-2); }

/* речник */
.gloss-search { width: 100%; padding: .7em .9em; border: 1.5px solid var(--rule); border-radius: var(--radius-s); background: var(--surface); font-size: 1rem; margin-bottom: 1rem; }
.gloss { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: .8rem; }
.gloss .card { padding: .9rem 1.1rem; border-left: 5px solid var(--accent); }
.gloss b { font-size: 1.02rem; }
.gloss p { margin: .3rem 0 .4rem; color: var(--ink-2); font-size: .95rem; }
.gloss a { font-size: .82rem; color: var(--ink-3); }

/* ---------- визуализации ---------- */
.viz { margin: 0 0 1.6rem; }
.viz-head { padding: .9rem 1.1rem; border-bottom: 1px solid var(--rule-soft); display: flex; gap: .8rem; align-items: center; flex-wrap: wrap; }
.viz-head h3 { margin: 0; font-size: 1.08rem; }
.viz-body { padding: 1rem 1.1rem; }
.viz-sql { font-family: var(--mono); font-size: .85rem; background: var(--code-bg); color: var(--code-ink); padding: .55em .8em; border-radius: var(--radius-s); white-space: pre-wrap; margin-bottom: .8rem; }
.viz-cap { min-height: 3em; font-size: 1rem; margin: 0 0 .8rem; padding: .55em .8em; background: color-mix(in srgb, var(--accent) 9%, var(--surface)); border-radius: var(--radius-s); border-left: 4px solid var(--accent); }
.viz-stage { display: flex; gap: 1rem; flex-wrap: wrap; align-items: flex-start; }
.viz-stage > div { min-width: 0; }
.viz-stage .lbl { font-size: .8rem; color: var(--ink-3); margin: 0 0 .25rem; font-weight: 600; }
.viz-ctrl { display: flex; gap: .5rem; align-items: center; margin-top: .9rem; flex-wrap: wrap; }
.viz-dots { display: flex; gap: 5px; margin-left: auto; }
.viz-dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--rule); }
.viz-dots i.on { background: var(--accent); }
table.rt tr.v-ok td { background: var(--ok-soft) !important; }
table.rt tr.v-no td { background: var(--bad-soft) !important; opacity: .55; text-decoration: line-through; text-decoration-color: color-mix(in srgb, var(--bad) 60%, transparent); }
table.rt tr.v-cur td { background: var(--mark) !important; color: var(--mark-ink); }
table.rt tr.v-new td { animation: vnew .7s ease; }
table.rt td.v-col, table.rt th.v-col { box-shadow: inset 0 0 0 9999px color-mix(in srgb, var(--accent) 16%, transparent); }
table.rt td.v-dim, table.rt th.v-dim { opacity: .3; }
table.rt td.v-chg { background: var(--mark) !important; color: var(--mark-ink); font-weight: 700; }
@keyframes vnew { from { background: var(--mark); } to { background: transparent; } }
table.rt tr.g0 td { background: hsl(210 80% 50% / .14) !important; } table.rt tr.g1 td { background: hsl(150 70% 40% / .16) !important; }
table.rt tr.g2 td { background: hsl(35 90% 55% / .18) !important; } table.rt tr.g3 td { background: hsl(280 70% 60% / .16) !important; }
table.rt tr.g4 td { background: hsl(350 80% 60% / .14) !important; } table.rt tr.g5 td { background: hsl(180 70% 40% / .16) !important; }
table.rt tr.g6 td { background: hsl(60 80% 45% / .18) !important; } table.rt tr.g7 td { background: hsl(15 80% 55% / .16) !important; }
.setbox { border: 2px solid var(--rule); border-radius: var(--radius-s); padding: .5rem .7rem; min-width: 160px; background: var(--surface); }
.setbox .it { font-family: var(--mono); font-size: .85rem; padding: .15em .45em; border-radius: 4px; margin: 2px 0; transition: background .3s; }
.setbox .it.v-ok { background: var(--ok-soft); color: var(--ok); font-weight: 700; }
.setbox .it.v-no { opacity: .35; text-decoration: line-through; }
.bigval { font-family: var(--mono); font-size: 1.6rem; font-weight: 700; padding: .3em .7em; background: var(--mark); color: var(--mark-ink); border-radius: var(--radius-s); display: inline-block; }

/* ---------- вход ---------- */
.landing { min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); }
.landing .hero { background: var(--top); color: #fff; padding: clamp(1.5rem, 5vw, 4rem); display: flex; flex-direction: column; justify-content: center; gap: 1.8rem; }
.landing .hero h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); margin: 0; letter-spacing: -.03em; font-weight: 800; }
.landing .hero p { color: #C3CBE0; max-width: 46ch; margin: 0; font-size: 1.08rem; }
.query { font-family: var(--mono); font-size: clamp(.85rem, 1.6vw, 1.02rem); color: #E8ECF5; white-space: pre; overflow-x: auto; }
.query .k { color: var(--mark); font-weight: 600; }
.query .s { color: #A6E3A1; }
.hero .rt-wrap { border-color: #3A4670; background: #222D4D; max-width: 640px; }
.hero table.rt th { background: #2E3A5E; color: #fff; }
.hero table.rt td { border-top-color: #2E3A5E; color: #DDE3F0; }
.hero table.rt tr:nth-child(even) td { background: #242F51; }
.hero table.rt tr.you td { background: var(--mark); color: var(--mark-ink); font-weight: 600; }
.hero .rt-meta { color: #8F9BBE; }
.landing .auth { padding: clamp(1.5rem, 5vw, 4rem); display: flex; flex-direction: column; justify-content: center; }
.auth-box { max-width: 380px; width: 100%; }
.tabs { display: flex; border-bottom: 2px solid var(--rule); margin-bottom: 1.4rem; }
.tabs button { background: none; border: 0; padding: .6em 1em; cursor: pointer; font-weight: 600; color: var(--ink-3); border-bottom: 3px solid transparent; margin-bottom: -2px; }
.tabs button.on { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- учител ---------- */
.t-main { padding: 1.5rem clamp(1rem, 3vw, 2.5rem) 4rem; }
.t-main h1 { margin: 0 0 1rem; font-size: 1.6rem; }
.chips { display: flex; gap: .35rem; flex-wrap: wrap; margin: 0 0 1rem; }
.chips button { border: 1.5px solid var(--rule); background: var(--surface); border-radius: 999px; padding: .3em .9em; cursor: pointer; font-size: .92rem; }
.chips button.on { border-color: var(--ink); background: var(--ink); color: var(--surface); }
.grid-wrap { overflow: auto; border: 1px solid var(--rule); border-radius: var(--radius-s); background: var(--surface); }
table.grid { border-collapse: collapse; font-size: .9rem; width: 100%; }
table.grid th, table.grid td { padding: .45rem .6rem; border-bottom: 1px solid var(--rule-soft); text-align: left; white-space: nowrap; }
table.grid thead th { background: var(--rule-soft); font-weight: 600; position: sticky; top: 0; z-index: 1; }
table.grid th.lh { text-align: center; cursor: pointer; }
table.grid th.lh:hover { background: var(--mark); color: var(--mark-ink); }
table.grid td.cell { text-align: center; font-family: var(--mono); font-size: .8rem; }
table.grid td.name { font-weight: 500; }
table.grid td.name a { text-decoration: none; }
table.grid td.name a:hover { text-decoration: underline; }
table.grid tr.off td { opacity: .5; }
.heat { display: inline-block; min-width: 3.2em; padding: .1em .3em; border-radius: 4px; }
.mx td.cell { cursor: pointer; }
.mx td.cell.ok { background: var(--ok-soft); color: var(--ok); font-weight: 700; }
.mx td.cell.bad { background: var(--bad-soft); color: var(--bad); }
.mx td.cell:hover { outline: 2px solid var(--ink); outline-offset: -2px; }
.cards2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.2rem; align-items: start; }
.box { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius-s); padding: 1rem 1.2rem; }
.box h2 { margin: 0 0 .8rem; font-size: 1.1rem; }
.code-small { font-family: var(--mono); font-size: .82rem; background: var(--code-bg); color: var(--code-ink); padding: .5em .7em; border-radius: var(--radius-s); white-space: pre-wrap; word-break: break-word; margin: .3rem 0; }
.feed { list-style: none; margin: 0; padding: 0; }
.feed li { border-bottom: 1px solid var(--rule-soft); padding: .55rem 0; display: grid; grid-template-columns: 1.4rem 1fr; gap: .4rem; }
.feed .mark-ok { color: var(--ok); font-weight: 700; }
.feed .mark-bad { color: var(--bad); font-weight: 700; }
.feed .meta { font-size: .85rem; color: var(--ink-3); }
.big-code { font-family: var(--mono); font-size: 1.3rem; font-weight: 700; background: var(--mark); color: var(--mark-ink); padding: .1em .5em; border-radius: 4px; letter-spacing: .04em; }
details.att { border-bottom: 1px solid var(--rule-soft); padding: .35rem 0; }
details.att summary { cursor: pointer; font-size: .9rem; }
.hint-mark { font-size: .7rem; color: #B08D00; vertical-align: super; }

/* ---------- мобилни ---------- */
@media (max-width: 900px) {
  .hello { grid-template-columns: 1fr; }
  .landing { grid-template-columns: 1fr; }
  .who { display: none; }
  .topbar { gap: .4rem; padding: .5rem .6rem; }
  .topbar nav { overflow-x: auto; scrollbar-width: none; }
  .topbar nav a, .topbar nav button { padding: .35em .5em; font-size: .9rem; }
  .brand { font-size: 1rem; }
  .lbody, .lhead { padding-left: 1rem; padding-right: 1rem; }
  .stepper { margin: 0 -1rem; }
  .stepper .lab { display: none; }
  .stepper a.on .lab { display: inline; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }
@media print {
  .topbar, .stepper, .steps-nav, .task-nav, .chips-nav, .btn { display: none !important; }
  body { background: #fff; }
  .card { box-shadow: none; border: 0; }
}