:root{--bg:#f5f6fb;--card:#fff;--ink:#1b1f3b;--mute:#6b7194;--line:#e3e6f2;--brand:#5b6ee8;--brand2:#7b8cff;--ok:#1f9d68;--warn:#d9901a;--bad:#d64550;--side:#151a35;--sideink:#c9cffa}
@media (prefers-color-scheme:dark){:root{--bg:#0e1124;--card:#171b36;--ink:#e8ecff;--mute:#8e95bd;--line:#262b4d;--side:#0a0d1c}}
*{box-sizing:border-box}html,body{margin:0;height:100%}
body{font:14px/1.5 system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--ink)}
h1{font-size:22px;margin:0 0 4px}h2{font-size:16px;margin:0 0 10px}h3{font-size:14px;margin:0 0 6px}
p{margin:0 0 10px}.mute{color:var(--mute)}.small{font-size:12px}.mono{font-family:ui-monospace,Menlo,monospace}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
button,input,select,textarea{font:inherit;color:inherit}
input,select,textarea{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:10px;background:var(--card);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px #5b6ee833}
label{display:block;font-weight:600;font-size:12px;margin:12px 0 4px}
.btn{display:inline-flex;align-items:center;gap:6px;border:0;border-radius:10px;padding:9px 14px;background:var(--brand);color:#fff;font-weight:600;cursor:pointer}
.btn:hover{background:#4a5dd6}.btn:disabled{opacity:.55;cursor:default}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}.btn.ghost:hover{background:var(--line)}
.btn.danger{background:var(--bad)}.btn.sm{padding:5px 10px;font-size:12px;border-radius:8px}
.auth{min-height:100%;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at 20% 10%,#5b6ee833,transparent 50%),var(--bg)}
.auth .box{width:100%;max-width:420px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:0 20px 50px #0002}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;margin-bottom:6px}
.logo{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center}
.logo i{display:block;width:6px;height:6px;border-radius:50%;background:#fff;margin:0 2px;box-shadow:0 0 0 2px #fff3}.logo span{display:flex}
.tabs{display:flex;gap:4px;background:var(--bg);border-radius:12px;padding:4px;margin:14px 0}
.tabs button{flex:1;border:0;background:transparent;padding:8px;border-radius:9px;font-weight:600;cursor:pointer;color:var(--mute)}.tabs button.on{background:var(--card);color:var(--ink);box-shadow:0 1px 4px #0002}
.seg{display:grid;grid-template-columns:1fr 1fr;gap:8px}.seg label{margin:0;border:1px solid var(--line);border-radius:12px;padding:10px;cursor:pointer;font-weight:500}
.seg input{width:auto;margin-right:6px}.seg label.on{border-color:var(--brand);background:#5b6ee814}
.err{color:var(--bad);font-size:12px;min-height:16px;margin-top:8px}
.layout{display:flex;min-height:100%}
.side{width:230px;background:var(--side);color:var(--sideink);padding:18px 12px;display:flex;flex-direction:column;gap:4px;position:sticky;top:0;height:100vh;flex:none}
.side .brand{color:#fff;padding:0 8px 14px}
.side a{display:flex;gap:10px;align-items:center;color:var(--sideink);padding:9px 12px;border-radius:10px;font-weight:600;text-decoration:none}
.side a:hover{background:#ffffff12}.side a.on{background:var(--brand);color:#fff}
.side .grow{flex:1}.side .me{padding:10px 8px;font-size:12px;border-top:1px solid #ffffff1a}
.main{flex:1;padding:26px 30px;max-width:1100px;min-width:0}
.top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;margin-bottom:16px}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
.stat{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px}.stat b{display:block;font-size:26px}.stat span{color:var(--mute);font-size:12px}
table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:middle}th{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--mute)}
tr.click{cursor:pointer}tr.click:hover td{background:var(--bg)}
.badge{display:inline-block;padding:2px 9px;border-radius:20px;font-size:11px;font-weight:700;background:var(--line);color:var(--mute)}
.badge.easy,.badge.done{background:#1f9d6822;color:var(--ok)}.badge.medium,.badge.evaluating,.badge.active{background:#d9901a22;color:var(--warn)}.badge.hard,.badge.failed{background:#d6455022;color:var(--bad)}
.steps{list-style:none;margin:0;padding:0}.steps li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;border-bottom:1px solid var(--line)}.steps li:last-child{border:0}
.dot{width:22px;height:22px;border-radius:50%;border:2px solid var(--line);flex:none;display:grid;place-items:center;font-size:12px}.dot.ok{background:var(--ok);border-color:var(--ok);color:#fff}
pre,.code{background:#0d1021;color:#d8defc;border-radius:10px;padding:12px;overflow:auto;font:12px/1.5 ui-monospace,Menlo,monospace;white-space:pre-wrap;word-break:break-all;margin:6px 0}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.row.sp{justify-content:space-between}
.modal{position:fixed;inset:0;background:#0009;display:grid;place-items:center;padding:20px;z-index:20}
.modal .box{background:var(--card);border-radius:18px;padding:22px;width:100%;max-width:560px;max-height:90vh;overflow:auto}
.ring{width:110px;height:110px;border-radius:50%;display:grid;place-items:center;flex:none;background:conic-gradient(var(--c) calc(var(--p)*1%),var(--line) 0)}
.ring div{width:84px;height:84px;border-radius:50%;background:var(--card);display:grid;place-items:center;text-align:center;font-weight:800;font-size:24px;line-height:1}.ring small{display:block;font-size:10px;color:var(--mute);font-weight:500}
.dim{margin:10px 0}.dim .bar{height:8px;border-radius:5px;background:var(--line);overflow:hidden;margin:3px 0}.dim .bar i{display:block;height:100%;background:var(--brand);border-radius:5px}
.snip{border-left:3px solid var(--brand);padding-left:10px;margin:10px 0}
.empty{text-align:center;color:var(--mute);padding:26px}
#toasts{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:8px;z-index:50}
.toast{background:var(--ink);color:var(--bg);padding:10px 14px;border-radius:10px;box-shadow:0 8px 24px #0004;max-width:340px}.toast.bad{background:var(--bad);color:#fff}
.chips{display:flex;gap:6px;flex-wrap:wrap}
@media(max-width:800px){.side{position:fixed;bottom:0;top:auto;height:auto;width:100%;flex-direction:row;overflow:auto;z-index:10;padding:6px}.side .brand,.side .me,.side .grow{display:none}.side a{padding:8px 10px;white-space:nowrap}.main{padding:16px 14px 80px}}