:root{--bg:#0e0e0f;--panel:#161618;--panel2:#1d1d20;--line:#2a2a2e;--text:#e8e8ea;--mute:#8b8b93;--accent:#f2f2f2;--ok:#5fb37a;--bad:#d06464;--warn:#d6a74a}
*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 Inter,system-ui,sans-serif}
a{color:inherit}button{font:inherit;color:inherit;cursor:pointer}
header{position:sticky;top:0;z-index:10;background:rgba(14,14,15,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:18px;padding:10px 20px}
.logo{font-family:UnifrakturMaguntia,serif;font-size:30px;line-height:1;text-decoration:none}
.logo small{font-family:Inter;font-size:11px;letter-spacing:.25em;text-transform:uppercase;color:var(--mute);margin-left:8px;vertical-align:middle}
.hprog{flex:1;display:flex;align-items:center;gap:10px;max-width:520px;margin-left:auto}
.bar{flex:1;height:6px;background:var(--panel2);border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--accent);border-radius:99px;transition:width .4s}
.hprog span{font-size:12px;color:var(--mute);white-space:nowrap}
#menuBtn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:4px 10px}
.wrap{display:grid;grid-template-columns:300px 1fr;min-height:calc(100vh - 53px)}
nav{border-right:1px solid var(--line);padding:16px 12px;overflow-y:auto;height:calc(100vh - 53px);position:sticky;top:53px}
nav .navtop a{display:block;padding:7px 10px;border-radius:8px;text-decoration:none;color:var(--mute);font-size:14px}
nav .navtop a:hover,nav .navtop a.on{background:var(--panel);color:var(--text)}
.dom{margin-top:14px}
.dom h4{margin:0;padding:6px 10px;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);display:flex;justify-content:space-between}
.dom .bar{margin:2px 10px 6px;height:3px}
.obj{margin:2px 0}
.obj>button{width:100%;text-align:left;background:none;border:0;padding:6px 10px;border-radius:8px;font-size:13.5px;display:flex;gap:8px;color:var(--text)}
.obj>button:hover{background:var(--panel)}
.obj .les{display:none;padding-left:12px}.obj.open .les{display:block}
.les a{display:flex;gap:8px;align-items:center;padding:4px 10px;font-size:13px;color:var(--mute);text-decoration:none;border-radius:6px}
.les a:hover{color:var(--text)}.les a.on{color:var(--text);background:var(--panel)}
.dot{width:8px;height:8px;border-radius:50%;border:1px solid var(--mute);flex:none}
.dot.done{background:var(--ok);border-color:var(--ok)}.dot.part{background:var(--warn);border-color:var(--warn)}
main{padding:32px 40px 80px;max-width:860px;width:100%}
h1{font-size:28px;margin:0 0 6px;letter-spacing:-.01em}h2{font-size:20px;margin:28px 0 10px}
.crumb{font-size:12px;color:var(--mute);letter-spacing:.08em;text-transform:uppercase}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px 26px;margin:16px 0}
.lesson ul,.lesson ol{padding-left:20px}.lesson li{margin:4px 0}
code,pre{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:12.5px;background:#0b0b0c;border:1px solid var(--line);border-radius:5px}
code{padding:1px 5px;word-break:break-word}pre{padding:12px;overflow-x:auto}
.tip{margin-top:14px;padding:10px 14px;border-left:3px solid var(--accent);background:var(--panel2);border-radius:0 8px 8px 0;font-size:14px}
.btn{background:var(--accent);color:#111;border:0;border-radius:9px;padding:10px 18px;font-weight:600}
.btn.ghost{background:none;color:var(--text);border:1px solid var(--line)}
.btn:disabled{opacity:.4;cursor:default}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.qhead{display:flex;justify-content:space-between;color:var(--mute);font-size:12px;letter-spacing:.08em;text-transform:uppercase;margin-bottom:8px}
.qtext{font-size:16px;font-weight:500;margin-bottom:14px}
.opt{display:flex;gap:12px;width:100%;text-align:left;background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:11px 14px;margin:8px 0}
.opt:hover:not(:disabled){border-color:#55555c}
.opt .k{color:var(--mute);font-family:"JetBrains Mono";font-size:12px;padding-top:2px}
.opt.sel{border-color:var(--accent)}
.opt.right{border-color:var(--ok);background:rgba(95,179,122,.1)}
.opt.wrong{border-color:var(--bad);background:rgba(208,100,100,.1)}
.opt:disabled{cursor:default}
.ord{display:flex;align-items:center;gap:10px;background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:8px 10px;margin:6px 0}
.ord .t{flex:1}.ord .n{width:18px}.ord button{background:none;border:1px solid var(--line);border-radius:6px;width:30px;height:28px}
.ord.right{border-color:var(--ok)}.ord.wrong{border-color:var(--bad)}
.fb{margin-top:14px;padding:12px 14px;border-radius:10px;font-size:14px}
.fb.ok{background:rgba(95,179,122,.1);border:1px solid rgba(95,179,122,.4)}
.fb.no{background:rgba(208,100,100,.1);border:1px solid rgba(208,100,100,.4)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.stat b{display:block;font-size:24px}.stat span{font-size:12px;color:var(--mute)}
.dline{display:grid;grid-template-columns:1fr 60px;gap:4px 14px;align-items:center;margin:10px 0}
.dline .lbl{font-size:14px}.dline .pct{text-align:right;font-size:13px;color:var(--mute)}
.dline .bar{grid-column:1/-1}
.mute{color:var(--mute)}.small{font-size:13px}
.flag{background:none;border:1px solid var(--line);border-radius:8px;padding:4px 10px;font-size:12px}
.flag.on{border-color:var(--warn);color:var(--warn)}
.pal{display:flex;flex-wrap:wrap;gap:5px;margin-top:12px}
.pal button{width:30px;height:30px;border-radius:6px;border:1px solid var(--line);background:var(--panel2);font-size:11px}
.pal button.ans{background:#3a3a40}.pal button.fl{border-color:var(--warn)}.pal button.cur{outline:2px solid var(--accent)}
.timer{font-family:"JetBrains Mono";font-size:14px}
@media(max-width:860px){.wrap{grid-template-columns:1fr}nav{display:none;position:fixed;inset:53px 0 0 0;z-index:9;background:var(--bg);height:auto}body.nav nav{display:block}#menuBtn{display:block}main{padding:22px 18px 60px}.hprog span{display:none}.hprog{max-width:none}}