* {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    margin: 0;
    background: #f4f6f8;
    color: #333;
}

.header {
    background: #111827;
    color: #fff;
    padding: 30px;
    text-align: center;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: #fff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.card h2 {
    margin-top: 0;
}

button {
    margin-top: 10px;
    padding: 10px 15px;
    border: none;
    border-radius: 6px;
    background: #2563eb;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background: #1e40af;
}

input {
    width: 100%;
    padding: 10px;
    margin-top: 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
}

.footer {
    text-align: center;
    padding: 20px;
    color: #666;
}