:root{
  --bg:#0b0f14; --card:#121a23; --text:#e6edf3; --muted:#9fb0c0;
  --line:#223040; --accent:#5dd6ff; --danger:#ff5d7a;
}
*{box-sizing:border-box;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;}
body.dark{margin:0;background:var(--bg);color:var(--text);}
.wrap{max-width:980px;margin:0 auto;padding:20px;}
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
.topbar h1{font-size:18px;margin:0;}
.topbar nav a{color:var(--muted);text-decoration:none;margin-left:14px;padding:8px 10px;border-radius:10px;}
.topbar nav a.active,.topbar nav a:hover{color:var(--text);background:rgba(93,214,255,.12);}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;margin-bottom:14px;box-shadow:0 6px 18px rgba(0,0,0,.22);}
h2{margin:0 0 12px;font-size:14px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;}
label{display:block;font-size:12px;color:var(--muted);}
input,select,textarea{
  width:100%;margin-top:6px;background:#0e1520;color:var(--text);
  border:1px solid var(--line);border-radius:12px;padding:10px 12px;outline:none;
}
input:focus,select:focus,textarea:focus{border-color:rgba(93,214,255,.6);box-shadow:0 0 0 3px rgba(93,214,255,.12);}
.row{display:flex;gap:10px;align-items:center;}
.row.right{justify-content:flex-end;}
button{
  border:1px solid var(--line);background:#0e1520;color:var(--text);
  padding:10px 12px;border-radius:12px;cursor:pointer;
}
button.primary{border-color:rgba(93,214,255,.5);background:rgba(93,214,255,.15);}
button.ghost{opacity:.9}
button:hover{filter:brightness(1.05);}
.muted{margin-top:8px;color:var(--muted);font-size:12px;}
.table{margin-top:12px;border-top:1px solid var(--line);}
.thead,.trow{display:grid;grid-template-columns:1fr 120px 180px;gap:10px;padding:10px 0;border-bottom:1px solid var(--line);}
.thead{color:var(--muted);font-size:12px;}
.trow .x{color:var(--danger);text-align:center;cursor:pointer;}
.summary{margin-top:10px;color:var(--muted);font-size:12px;}
.result{margin-top:10px}
a.link{color:var(--accent)}
code{background:#0e1520;border:1px solid var(--line);padding:2px 6px;border-radius:8px;color:var(--text);}
hr{border:0;border-top:1px solid var(--line);margin:14px 0;}