:root {
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --bg-color: #f5f5f5;
    --text-color: #333;
    --container-bg: white;
    --border-color: #ddd;
    --shadow-color: rgba(0,0,0,0.1);
}

.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --container-bg: #2d2d2d;
    --border-color: #444;
    --shadow-color: rgba(0,0,0,0.3);
}

* {
    transition: background-color 0.3s ease, color 0.3s ease;
}

body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--container-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow-color);
    position: relative;
}

/* 顶部控制栏 */
.header-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

.control-btn {
    width: auto;
    padding: 8px 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.control-btn:hover {
    background: var(--primary-hover);
}

h1 {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 30px;
}

cite {
    display: inline-block;
    text-align: center;
    width: 100%;
    font-size: 0.9em;
    color: #666;
}

.dark-mode cite {
    color: #aaa;
}

a {
    color: var(--primary-color);
}

.control-section {
    margin-bottom: 20px;
    padding: 15px;
    background-color: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.preview-section {
    margin-bottom: 20px;
    text-align: center;
}

.device-preview {
    display: inline-block;
    width: 194px;
    height: 368px;
    background-color: black;
    position: relative;
    border-radius: 20px;
    margin: 20px auto;
    box-shadow: 0 0 20px rgba(0,0,0,0.3);
    overflow: hidden;
}

.preview-element {
    position: absolute;
    color: white;
}

canvas {
    display: block;
    margin: 10px 0;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    text-wrap: nowrap;
}

input, select, button {
    margin-bottom: 10px;
    padding: 8px;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    background: var(--container-bg);
    color: var(--text-color);
}

input:is([type="checkbox"]) {
    width: auto;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: var(--primary-hover);
}

.download-section {
    margin-top: 15px;
}

.color-picker {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.color-picker input[type="color"] {
    width: 50px;
    height: 40px;
}

.color-picker input[type="text"] {
    flex-grow: 1;
    min-width: 100px;
}

.font-preview {
    margin-top: 10px;
    font-size: 40px;
    text-align: center;
    min-height: 60px;
    border: 1px dashed var(--border-color);
    padding: 10px;
    background: var(--container-bg);
}

.samples {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 10px;
}

.sample-image {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 5px;
    background-color: var(--container-bg);
    text-align: center;
    font-size: 0.8em;
}

.sample-image img {
    max-width: 100px;
    height: auto;
}

.status-message {
    margin-top: 10px;
    padding: 10px;
    border-radius: 4px;
    display: block;
}

.status-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.dark-mode .status-message.success {
    background-color: #1a3a1f;
    color: #8bc34a;
    border-color: #2e7d32;
}

.dark-mode .status-message.error {
    background-color: #3a1a1a;
    color: #f44336;
    border-color: #c62828;
}

/* 帮助信息样式 */
.help-section {
    margin-bottom: 20px;
    padding: 15px;
    background: var(--container-bg);
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.help-content h3 {
    color: var(--primary-color);
    margin-top: 15px;
}

.help-content ol, .help-content ul {
    margin-left: 20px;
}

.help-content li {
    margin-bottom: 5px;
}

/* 页脚信息 */
.footer-info {
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.8em;
    color: #666;
}

.dark-mode .footer-info {
    color: #aaa;
    border-color: #444;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
        margin: 10px;
    }
    
    .header-controls {
        position: static;
        justify-content: center;
        margin-bottom: 15px;
    }
    
    .color-picker {
        flex-direction: column;
        align-items: stretch;
    }
    
    .color-picker input[type="color"] {
        width: 100%;
    }
}