:root{--bg:#0f1724;--card:#0b1220;--accent:#10b981;--text:#e6eef8;}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial;color:var(--text);background:linear-gradient(180deg,#071124 0%,#0b1220 100%);height:100vh}
header{position:fixed;top:12px;right:16px}
#panel-btn{display:inline-block;padding:8px 12px;background:#111827;border-radius:8px;color:var(--text);text-decoration:none;font-size:14px;box-shadow:0 2px 6px rgba(0,0,0,.4)}
.center{height:100vh;display:flex;align-items:center;justify-content:center}
.card{background:rgba(255,255,255,0.03);padding:36px;border-radius:12px;text-align:center;min-width:320px}
.card h1{margin:0 0 16px;font-size:28px}
.buttons{display:flex;gap:12px;justify-content:center}
.btn{padding:10px 18px;border-radius:8px;background:var(--accent);color:#042018;text-decoration:none;font-weight:600}
.btn.outline{background:transparent;color:var(--text);border:1px solid rgba(255,255,255,0.08)}
.small-card{background:rgba(255,255,255,0.03);padding:24px;border-radius:8px;text-align:center;min-width:280px}
input{padding:8px;border-radius:6px;border:1px solid rgba(255,255,255,0.06);background:transparent;color:var(--text);width:100%;margin:6px 0}
button{padding:8px 12px;border-radius:6px;border:none;background:var(--accent);color:#042018;cursor:pointer}
.small{font-size:12px;text-align:center;color:rgba(255,255,255,0.6);margin-top:12px}