:root {
    --bg-color: #f0f2f5;
    --card-bg-color: #ffffff;
    --text-color: #333;
    --primary-color: #3366cc;
    --border-color: #e0e0e0;
    --header-bg: #eaecf0;
}

body {
    font-family: 'Noto Sans TC', sans-serif, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--card-bg-color);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    overflow: hidden;
}

header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 30px;
    text-align: center;
}

header h1 {
    margin: 0;
    color: #000;
}

header p {
    margin: 5px 0 0;
    color: #54595d;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    padding: 30px;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.controls-panel h2, .output-area h2 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--primary-color);
}

fieldset {
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 20px;
}

legend {
    font-weight: bold;
    color: #444;
    padding: 0 10px;
}

.form-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.form-group label {
    flex-basis: 40%;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group select {
    flex-basis: 55%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
}

.form-group input[type="color"] {
    flex-basis: 55%;
    height: 38px;
    padding: 4px;
    border: 1px solid #ccc;
    border-radius: 4px;
    cursor: pointer;
}

.preview-box {
    min-height: 100px;
    background-color: #f9f9f9;
    border: 1px dashed #ccc;
    border-radius: 5px;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    overflow: auto;
}

#html-code {
    width: 100%;
    box-sizing: border-box;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: monospace;
    font-size: 13px;
    background-color: #fafafa;
    resize: vertical;
}

#copy-button {
    display: block;
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#copy-button:hover {
    background-color: #2851a3;
}

footer {
    text-align: center;
    padding: 15px;
    background-color: var(--header-bg);
    border-top: 1px solid var(--border-color);
    font-size: 14px;
    color: #54595d;
}