body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
}

.input-area {
    display: flex;
    margin-bottom: 20px;
}

#memo-input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

#add-btn {
    padding: 10px 15px;
    background-color: #2ecc71;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 10px;
    font-size: 16px;
}

#add-btn:hover {
    background-color: #27ae60;
}

.filter-area {
    margin-bottom: 20px;
}

#search-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

#memo-list {
    list-style: none;
    padding: 0;
}

.memo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border: 1px solid #eee;
    border-radius: 4px;
    margin-bottom: 10px;
    background-color: #f9f9f9;
}

.memo-item:hover {
    background-color: #f0f0f0;
}

.delete-btn {
    background-color: #e74c3c;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 10px;
    cursor: pointer;
}

.delete-btn:hover {
    background-color: #c0392b;
}

.timestamp {
    font-size: 0.8em;
    color: #7f8c8d;
    margin-top: 5px;
}