html {
    background: #f5f5f5;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    justify-content: center;
    row-gap: 40px;
}

h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 30px;
}

h2 {
    color: #34495e;
    margin-bottom: 15px;
}

table {
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-radius: 8px;
    overflow: hidden;
    margin: 20px 0;
    width: 100%;
    min-width: 600px;
}

th {
    background: #3498db;
    color: white;
    padding: 15px;
    text-align: left;
}

td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
}

td:last-child {
    width: 70%;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background: #f8f9fa;
}

button, input[type="submit"] {
    background: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease;
}

button:hover, input[type="submit"]:hover {
    background: #2980b9;
}

.child, .week-plan {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.date {
    color: #666;
    font-style: italic;
    margin-bottom: 15px;
}

.button-group {
    display: flex;
    gap: 10px;
    justify-content: center;
}

select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

select:focus {
    outline: none;
    border-color: #3498db;
}