body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: #0f172a;
    color: #fff;
}

.container {
    padding: 30px;
    max-width: 1100px;
    margin: auto;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: #1e293b;
    padding: 20px;
    border-radius: 12px;
}

input, select {
    width: 100%;
    padding: 10px;
    margin: 6px 0;
    border-radius: 6px;
    border: none;
}

button {
    width: 100%;
    padding: 10px;
    margin-top: 8px;
    border: none;
    border-radius: 6px;
    background: #3b82f6;
    color: white;
    font-weight: bold;
    cursor: pointer;
}

button.secondary {
    background: #64748b;
}

.message {
    margin-bottom: 20px;
    padding: 12px;
    border-radius: 8px;
    font-weight: bold;
}

.success {
    background: #065f46;
    color: #34d399;
}

.error {
    background: #7f1d1d;
    color: #f87171;
}