:root{--bg:#F5F7FB;--surface:#fff;--surface-2:#EAEFF7;--ink:#001C43;--ink-2:#4B5670;--ink-3:#8A93A8;--line:#DDE3EE;--accent:#1E4FD8;--accent-soft:#E3EAFF;--mint:#12B886;--mint-soft:#DDF5EC;--amber:#B36B00;--amber-soft:#FFF1D6;--rose:#D63A5F;--rose-soft:#FDE3EA;--r:16px}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:"Manrope",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:15.5px;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
h1{font-family:"Unbounded",sans-serif;font-size:26px;font-weight:700;letter-spacing:-.01em;margin-bottom:6px}
h2{font-family:"Unbounded",sans-serif;font-size:18px;font-weight:700;margin-bottom:14px}
h3{font-size:16px;font-weight:700}
.sub{color:var(--ink-2);margin-bottom:22px}
.shell{display:grid;grid-template-columns:250px 1fr;min-height:100vh}
aside{background:var(--ink);color:#fff;padding:24px 18px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column}
.brand{display:flex;align-items:center;gap:10px;font-family:"Unbounded",sans-serif;font-weight:700;font-size:18px;color:#fff;text-decoration:none;margin-bottom:28px;padding:0 8px}
.brand img{height:26px;filter:brightness(0) invert(1)}
.brand small{display:block;font-family:"Manrope";font-size:11px;font-weight:600;color:#8FA3C9;letter-spacing:.02em}
aside nav a{display:flex;align-items:center;gap:10px;padding:11px 12px;border-radius:10px;color:#C9D4EA;text-decoration:none;font-weight:600;font-size:14.5px;margin-bottom:3px}
aside nav a:hover{background:rgba(255,255,255,.08);color:#fff}
aside nav a.active{background:#fff;color:var(--ink)}
aside .me{margin-top:auto;font-size:13px;color:#8FA3C9;padding:14px 8px 0;border-top:1px solid rgba(255,255,255,.12)}
aside .me b{display:block;color:#fff;font-size:14px}
aside .me a{color:#C9D4EA}
main{padding:34px 40px;max-width:1240px;width:100%}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;margin-bottom:18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.stat b{display:block;font-family:"Unbounded",sans-serif;font-size:24px}
.stat span{color:var(--ink-3);font-size:13px}
label{display:block;font-size:13px;font-weight:700;color:var(--ink-2);margin:12px 0 5px}
input,select,textarea{width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:10px;font:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
textarea{min-height:90px;resize:vertical}
.row{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:999px;font-weight:700;font-size:14.5px;border:1.5px solid transparent;background:var(--accent);color:#fff;text-decoration:none;cursor:pointer;font-family:inherit}
.btn:hover{background:#163FB0}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn.ghost:hover{background:var(--surface-2)}
.btn.sm{padding:7px 13px;font-size:13px}
.btn.ok{background:var(--mint)}.btn.warn{background:var(--rose)}
.btn.link{background:none;color:var(--accent);padding:0;border:0}
table{width:100%;border-collapse:collapse}
th{text-align:left;font-size:12.5px;color:var(--ink-3);font-weight:700;padding:0 12px 10px;border-bottom:1px solid var(--line)}
td{padding:13px 12px;border-bottom:1px solid var(--line);vertical-align:middle;font-size:14.5px}
tr:last-child td{border-bottom:0}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);white-space:nowrap}
.tag.ok{background:var(--mint-soft);color:#0B7A57}.tag.warn{background:var(--amber-soft);color:var(--amber)}.tag.risk{background:var(--rose-soft);color:var(--rose)}.tag.acc{background:var(--accent-soft);color:var(--accent)}
.bar{height:8px;background:var(--surface-2);border-radius:99px;overflow:hidden;min-width:100px}
.bar i{display:block;height:100%;background:var(--accent);border-radius:99px}
.flash{padding:12px 16px;border-radius:12px;margin-bottom:18px;font-weight:600;font-size:14.5px}
.flash.ok{background:var(--mint-soft);color:#0B7A57}.flash.error{background:var(--rose-soft);color:var(--rose)}
.muted{color:var(--ink-3);font-size:13.5px}
.mod{border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;margin-bottom:14px;background:#fff}
.mod.locked{opacity:.55}
.mod-head{display:flex;justify-content:space-between;gap:14px;align-items:center;flex-wrap:wrap}
.mod-head .num{font-family:"Unbounded";font-size:12px;color:var(--accent);background:var(--accent-soft);padding:4px 9px;border-radius:8px;margin-right:8px}
.list{list-style:none}.list li{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:9px 0;border-top:1px dashed var(--line);font-size:14.5px}
.list li:first-child{border-top:0}
.inline{display:flex;gap:10px;align-items:end;flex-wrap:wrap}.inline>div{flex:1;min-width:160px}
.inline label{margin-top:0}
details>summary{cursor:pointer;font-weight:700;color:var(--accent);font-size:14px;list-style:none}
details>summary::-webkit-details-marker{display:none}
.chart{display:flex;gap:6px;align-items:end;height:160px;padding-top:10px;margin-bottom:24px}
.chart div{flex:1;background:var(--accent);border-radius:6px 6px 0 0;min-width:6px;position:relative}
.chart div span{position:absolute;bottom:-20px;left:50%;transform:translateX(-50%);font-size:10px;color:var(--ink-3);white-space:nowrap}
.login{min-height:100vh;display:grid;place-items:center;padding:20px}
.login .card{width:100%;max-width:420px;padding:36px}
.video{aspect-ratio:16/9;width:100%;border-radius:12px;background:#000;margin:10px 0}
.video iframe,.video video{width:100%;height:100%;border:0;border-radius:12px}
.file-ic{width:36px;height:36px;border-radius:9px;background:var(--surface-2);display:grid;place-items:center;font-size:11px;font-weight:800;color:var(--ink-2);flex:none}
.fl{display:flex;align-items:center;gap:12px}
@media (max-width:900px){.shell{grid-template-columns:1fr}aside{position:static;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center;gap:6px;padding:14px}aside nav{display:flex;flex-wrap:wrap;gap:4px}aside .me{margin:0 0 0 auto;border:0;padding:0}.brand{margin:0 14px 0 0}main{padding:22px 16px}.grid2,.grid3,.grid4,.row{grid-template-columns:1fr}table{display:block;overflow-x:auto}}

/* ---------- песочница Python ---------- */
.py-sandbox{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:14px 0;background:var(--surface)}
.py-sandbox .py-head{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--surface-2);flex-wrap:wrap}
.py-sandbox .py-head b{font-size:15px}
.py-sandbox .py-head .py-actions{margin-left:auto;display:flex;gap:8px}
.py-sandbox .py-desc{padding:12px 14px 0;color:var(--ink-2);font-size:14.5px}
.py-sandbox textarea.py-code{width:100%;min-height:190px;border:0;border-top:1px solid var(--line);padding:12px 14px;font-family:"JetBrains Mono",Consolas,"Courier New",monospace;font-size:14px;line-height:1.55;resize:vertical;background:var(--surface);color:var(--ink)}
.py-sandbox textarea.py-code:focus{outline:none}
.py-sandbox .CodeMirror{height:auto;min-height:190px;border-top:1px solid var(--line);font-family:"JetBrains Mono",Consolas,"Courier New",monospace;font-size:14px}
.py-sandbox .py-out{margin:0;padding:12px 14px;border-top:1px solid var(--line);background:#0E1424;color:#D7E0F5;font-family:"JetBrains Mono",Consolas,"Courier New",monospace;font-size:13.5px;white-space:pre-wrap;word-break:break-word;min-height:44px;max-height:320px;overflow:auto}
.py-sandbox .py-out.err{color:#FF9AAE}
.py-hint{color:var(--ink-3);font-size:13px;padding:0 14px 12px}

/* ---------- конспект и тест ---------- */
.lesson-body{color:var(--ink-2);font-size:15.5px;line-height:1.65}
.lesson-body p{margin:10px 0}
.lesson-body h4{margin:16px 0 6px;color:var(--ink);font-size:16.5px}
.lesson-body ul,.lesson-body ol{margin:10px 0 10px 20px;display:grid;gap:6px}
.lesson-body code{background:var(--surface-2);padding:1px 6px;border-radius:5px;font-family:Consolas,"Courier New",monospace;font-size:14px;color:var(--ink)}
.lesson-body .code-block{background:#0E1424;color:#D7E0F5;padding:12px 14px;border-radius:10px;overflow:auto;margin:12px 0}
.lesson-body .code-block code{background:none;color:inherit;padding:0;font-size:13.5px;line-height:1.55}

.quiz-q{padding:12px 0;border-top:1px dashed var(--line)}
.quiz-q:first-of-type{border-top:0}
.quiz-q.ok{background:var(--mint-soft);border-radius:10px;padding:12px;margin:6px 0;border-top:0}
.quiz-q.bad{background:var(--rose-soft);border-radius:10px;padding:12px;margin:6px 0;border-top:0}
.quiz-opt{display:flex;align-items:center;gap:9px;padding:7px 0;cursor:pointer;font-size:15px}
.quiz-opt input{width:17px;height:17px;flex:none;margin:0}
.quiz-mark{font-size:12px;font-weight:700;padding:2px 8px;border-radius:999px;margin-left:auto;white-space:nowrap}
.quiz-mark.ok{background:var(--mint);color:#fff}
.quiz-mark.bad{background:var(--rose);color:#fff}
.quiz-explain{margin-top:8px;font-size:13.5px;color:var(--ink-2)}