* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    margin: 2rem auto;
    padding: 0 1rem;
    width: 100%;
}

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

.counter-box {
    background-color: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
}

textarea {
    width: 100%;
    height: 600px;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    resize: both;
    font-size: 1rem;
    margin-bottom: 0;
    transition: border-color 0.3s ease;
    min-width: 300px;
    min-height: 200px;
    max-width: none;
}

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

.stats {
    display: grid;
    gap: 1rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem;
    background-color: #f8f9fa;
    border-radius: 5px;
}

.label {
    font-weight: bold;
    color: #2c3e50;
}

.font-size-control {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.font-size-control label {
    font-size: 14px;
    color: #666;
}

.font-size-control input[type="range"] {
    width: 150px;
}

#font-size-value {
    font-size: 14px;
    color: #666;
    min-width: 45px;
}

@media (max-width: 600px) {
    .container {
        margin: 1rem auto;
    }
    
    .counter-box {
        padding: 1rem;
    }
}