*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: linear-gradient(135deg, #1e1e1e 0%, #2d2d2d 100%); font-family: 'Segoe UI', sans-serif; }
.login-container { display: flex; justify-content: center; align-items: center; min-height: 100vh; }
.login-box { background: #1a1a1a; border: 1px solid #333; border-radius: 8px; padding: 40px; width: 100%; max-width: 400px; box-shadow: 0 4px 20px rgba(0,0,0,0.5); }
.login-box h1 { color: #00d4ff; text-align: center; font-size: 32px; margin: 0 0 10px; text-shadow: 0 0 10px rgba(0,212,255,0.5); }
.login-box .subtitle { color: #888; text-align: center; margin-bottom: 30px; font-size: 14px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; color: #ccc; margin-bottom: 8px; font-size: 14px; }
.form-control { width: 100%; padding: 10px; background: #2a2a2a; border: 1px solid #444; border-radius: 4px; color: #fff; font-size: 14px; transition: border-color 0.3s; }
.form-control:focus { outline: none; border-color: #00d4ff; box-shadow: 0 0 5px rgba(0,212,255,0.3); }
.btn-primary { width: 100%; padding: 12px; background: linear-gradient(90deg, #00d4ff, #0099cc); color: white; border: none; border-radius: 4px; font-size: 14px; font-weight: 600; cursor: pointer; transition: all 0.3s; }
.btn-primary:hover { box-shadow: none; transform: none; }
.alert-danger { background: #2c1a1a; border: 1px solid #8b3a3a; color: #ff6b6b; padding: 12px; border-radius: 4px; margin-bottom: 20px; font-size: 13px; }

@media (max-width: 768px) {
    .login-container {
        align-items: flex-start;
        padding: 14px;
    }

    .login-box {
        padding: 22px 16px;
        max-width: 100%;
        margin-top: 6vh;
    }

    .login-box h1 {
        font-size: 26px;
    }
}