body {
    font-family: Arial, sans-serif;
    margin: 30px;
    background: #f4f6f8;
}

h1, h2 {
    margin-bottom: 10px;
}

.card {
    background: white;
    padding: 20px;
    margin-bottom: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.hidden {
    display: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

input {
    width: 100%;
    padding: 6px;
    margin-bottom: 8px;
}

button {
    padding: 8px 14px;
    cursor: pointer;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    border: 1px solid #ddd;
    padding: 6px;
    text-align: center;
}

.ok {
    color: green;
    font-weight: bold;
}

.error {
    color: red;
    font-weight: bold;
}

.highlight {
    font-weight: bold;
    background: #f9f9f9;
}

.stats {
    margin-top: 15px;
}