:root { --bg:#0b0d12; --card:#121620; --fg:#e6edf3; --muted:#8b949e; --accent:#3b82f6; }
*{box-sizing:border-box}body{margin:0;font-family:system-ui,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--fg)}
header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid #1f2837}
header a{color:var(--fg);text-decoration:none;margin-left:12px}
main{padding:20px;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(360px,1fr))}
.card{background:var(--card);border:1px solid #1f2837;border-radius:16px;padding:16px}
h1,h2,h3{margin:6px 0 12px}label{display:block;margin:10px 0}
input,textarea,select,button{width:100%;padding:10px;border-radius:10px;border:1px solid #2b3447;background:#0c111b;color:var(--fg)}
textarea{min-height:100px}button{background:var(--accent);border:none;cursor:pointer;font-weight:600}
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.muted{color:var(--muted);font-size:.9em}
@media(max-width:640px){.grid{grid-template-columns:1fr}}