:root{--bg:#0b1b2b;--card:#132b41;--acc:#1f6feb;--txt:#e5eefc;--mut:#9db7d6}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--txt);font-family:system-ui,Segoe UI,Roboto,Arial,sans-serif}
.container{max-width:1100px;margin:40px auto;padding:16px}
.card{background:var(--card);border:1px solid #0e2237;border-radius:10px;padding:18px}
.btn{background:var(--acc);color:#fff;border:none;padding:10px 14px;border-radius:8px;cursor:pointer;text-decoration:none;display:inline-block}
.btn.secondary{background:#24486d}
.input, select, textarea{width:100%;padding:10px;border-radius:8px;border:1px solid #24486d;background:#0e2237;color:#e5eefc}
.table{width:100%;border-collapse:collapse}
.table th,.table td{padding:10px;border-bottom:1px solid #24486d;text-align:left}
.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}
.nav a{color:var(--txt);margin-right:12px;text-decoration:none}
.alert{padding:10px;border-radius:8px;margin-bottom:12px}
.alert.error{background:#5a1a1a}
.alert.success{background:#1a5a2a}
small.mut{color:var(--mut)}
.layout{display:grid;grid-template-columns:1fr 300px;gap:16px}
.sidebar{background:var(--card);border:1px solid #0e2237;border-radius:10px;padding:16px;height:fit-content;position:sticky;top:24px}
.sidebar h3{margin-top:0}
.sidebar .menu a{display:block;color:var(--txt);text-decoration:none;padding:8px 10px;border-radius:8px;margin-bottom:6px;background:#0e2237}
.sidebar .menu a:hover{background:#16314c}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width: 900px){.layout{grid-template-columns:1fr}.sidebar{position:static;margin-top:16px}.form-row{grid-template-columns:1fr}}