:root{
  --bg:#0f172a; --bg2:#111c34; --panel:#ffffff; --ink:#0f172a; --muted:#64748b;
  --line:#e2e8f0; --brand:#2563eb; --brand-d:#1d4ed8; --ok:#059669; --okbg:#ecfdf5;
  --err:#dc2626; --errbg:#fef2f2; --warn:#b45309; --chip:#f1f5f9; --radius:12px;
}
*{box-sizing:border-box}
body{margin:0;font:14px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:#f8fafc}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.layout{display:flex;min-height:100vh}
/* sidebar */
.sidebar{width:236px;background:linear-gradient(180deg,var(--bg),var(--bg2));color:#cbd5e1;
  display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.brand{padding:20px 18px;font-weight:700;color:#fff;font-size:16px;letter-spacing:.2px;
  border-bottom:1px solid rgba(255,255,255,.08);display:flex;gap:10px;align-items:center}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px rgba(37,99,235,.25)}
.nav{padding:12px 10px;flex:1;overflow:auto}
.nav a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:9px;color:#cbd5e1;font-weight:500}
.nav a:hover{background:rgba(255,255,255,.06);text-decoration:none;color:#fff}
.nav a.active{background:var(--brand);color:#fff}
.nav .sec{padding:14px 12px 6px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#64748b}
.side-foot{padding:14px;border-top:1px solid rgba(255,255,255,.08);font-size:12px;color:#94a3b8}
.side-foot a{color:#cbd5e1}
/* main */
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:60px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;
  justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:5}
.topbar h1{font-size:17px;margin:0}
.who{font-size:13px;color:var(--muted)}
.who b{color:var(--ink)}
.content{padding:24px;max-width:1080px;width:100%}
/* cards */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:18px;
  box-shadow:0 1px 2px rgba(15,23,42,.04)}
.card h2{margin:0 0 4px;font-size:15px}
.card .sub{color:var(--muted);margin:0 0 16px;font-size:13px}
.grid{display:grid;gap:16px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:820px){.grid.cols-3,.grid.cols-2{grid-template-columns:1fr}.sidebar{display:none}}
/* platform tiles */
.tile{border:1px solid var(--line);border-radius:var(--radius);padding:18px;background:#fff}
.tile h3{margin:0 0 6px;font-size:14px}
.tile p{margin:0 0 14px;color:var(--muted);font-size:13px}
.tag{display:inline-block;font-size:11px;font-weight:600;padding:3px 8px;border-radius:20px;background:var(--chip);color:#334155}
.tag.poolbtc{background:#eff6ff;color:#1d4ed8}
.tag.contract{background:#f0fdf4;color:#15803d}
.tag.minersme{background:#fef3c7;color:#92400e}
/* forms */
label{display:block;font-weight:600;font-size:13px;margin:12px 0 5px}
label .hint{font-weight:400;color:var(--muted)}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;font:inherit;background:#fff}
input:focus,select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:640px){.row{grid-template-columns:1fr}}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;border:0;border-radius:9px;
  padding:11px 18px;font:600 14px/1 inherit;cursor:pointer}
.btn:hover{background:var(--brand-d);text-decoration:none}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.sm{padding:7px 12px;font-size:13px}
.btn.danger{background:#fff;color:var(--err);border:1px solid #fecaca}
.actions{margin-top:18px;display:flex;gap:10px}
/* flash */
.flash{padding:12px 14px;border-radius:10px;margin-bottom:14px;font-size:13.5px;border:1px solid transparent}
.flash.success{background:var(--okbg);color:var(--ok);border-color:#a7f3d0}
.flash.error{background:var(--errbg);color:var(--err);border-color:#fecaca}
/* tables */
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:#f8fafc}
.pill{font-size:11px;font-weight:600;padding:3px 9px;border-radius:20px}
.pill.ok{background:var(--okbg);color:var(--ok)}
.pill.no{background:var(--errbg);color:var(--err)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px}
.kb h3{margin-top:22px}
.kb ul{padding-left:18px}
.kb li{margin:6px 0}
/* login */
.login-wrap{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#0f172a,#1e293b)}
.login-card{background:#fff;border-radius:16px;padding:34px;width:360px;box-shadow:0 20px 60px rgba(2,6,23,.4)}
.login-card .brand{border:0;padding:0 0 18px;color:var(--ink)}
.hidden{display:none}