:root{
  --bg1:#0b1220;
  --bg2:#0f2a4a;
  --card:#ffffff;
  --text:#0b1220;
  --muted:#5a667a;
  --primary:#6b3fa1;
  --primary2:#3b82f6;
  --border:#e7e9ee;
  --shadow: 0 18px 50px rgba(0,0,0,.20);
  --radius: 16px;
}

*{box-sizing:border-box}

body{
  margin:0;
  font-family: Arial, Helvetica, sans-serif;
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background:
    radial-gradient(1100px 600px at 20% 10%, rgba(107,63,161,.45), transparent 60%),
    radial-gradient(900px 520px at 80% 20%, rgba(59,130,246,.35), transparent 55%),
    linear-gradient(135deg, var(--bg1), var(--bg2));
  padding:24px;
}

.shell{ width:min(980px,100%); }
.panel{
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  padding:26px;
  color:#fff;
  box-shadow: var(--shadow);
}

.brand{
  display:flex;
  align-items:center;
  gap:14px;
  margin-bottom:16px;
}
.brand .logo{
  width:56px;height:56px;border-radius:14px;
  background: rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.18);
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.brand .logo img{width:100%;height:100%;object-fit:cover}
.brand h1{font-size:26px;margin:0;line-height:1.2}
.brand p{margin:6px 0 0;color:rgba(255,255,255,.78);font-size:13px}

.card{
  margin-top:16px;
  background: var(--card);
  border-radius: var(--radius);
  padding:22px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(255,255,255,.12);
}

.card h2{margin:0 0 6px;color:var(--text);font-size:22px}
.card .sub{margin:0 0 16px;color:var(--muted);font-size:13px}

.field{margin-top:12px}
label{display:block;font-size:12px;color:#475569;margin-bottom:6px}
input{
  width:100%;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  outline:none;
  font-size:14px;
}
input:focus{
  border-color: rgba(107,63,161,.55);
  box-shadow: 0 0 0 4px rgba(107,63,161,.15);
}

.btn{
  width:100%;
  margin-top:16px;
  border:0;
  cursor:pointer;
  padding:12px 14px;
  border-radius:12px;
  font-weight:700;
  color:#fff;
  background: linear-gradient(135deg, var(--primary), var(--primary2));
}
.btn:hover{opacity:.97}

.note{margin-top:12px;font-size:12px;color:#64748b;text-align:center}

.alert{padding:10px 12px;border-radius:12px;margin:10px 0 14px;font-size:13px}
.alert.err{background:#ffe7e7;border:1px solid #ffbaba;color:#a10000}