/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background-color: #f5f5f5;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.upload-section {
    margin-bottom: 20px;
    padding: 20px;
    border: 2px dashed #ddd;
    border-radius: 8px;
    text-align: center;
}

.upload-section input[type="file"] {
    display: none;
}

.upload-section label {
    display: inline-block;
    padding: 10px 20px;
    background: #007bff;
    color: white;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.upload-section label:hover {
    background: #0056b3;
}

.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.control-group label {
    font-weight: bold;
    color: #555;
}

.control-group input {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

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

#subtitleText {
    width: 100%;
    height: 120px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
    resize: vertical;
    font-family: inherit;
}

.buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.buttons button {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

#generateBtn {
    background: #28a745;
    color: white;
}

#generateBtn:hover {
    background: #218838;
}

#saveBtn {
    background: #17a2b8;
    color: white;
}

#saveBtn:hover:not(:disabled) {
    background: #138496;
}

#saveBtn:disabled {
    background: #6c757d;
    cursor: not-allowed;
}

.preview-section {
    text-align: center;
}

#preview {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量 - 苹果设计系统色彩 */
:root {
    --primary-blue: #007AFF;
    --primary-blue-hover: #0056CC;
    --secondary-gray: #8E8E93;
    --background-primary: #F2F2F7;
    --background-secondary: #FFFFFF;
    --background-tertiary: #F9F9F9;
    --text-primary: #000000;
    --text-secondary: #3C3C43;
    --text-tertiary: #8E8E93;
    --border-color: #E5E5EA;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 25px rgba(0, 0, 0, 0.15);
    --radius-small: 8px;
    --radius-medium: 12px;
    --radius-large: 16px;
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* 全局样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
    background: var(--background-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 主容器 - 横版布局 */
.app-container {
    display: flex;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    background: var(--background-secondary);
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-heavy);
    overflow: hidden;
}

/* 左侧边栏 */
.sidebar {
    flex: 1;
    max-width: 50%;
    background: var(--background-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-y: auto;
}

/* 头部区域 */
.header {
    padding: 8px 12px 6px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.header h1 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 2px;
    letter-spacing: -0.5px;
}

.header .subtitle {
    font-size: 12px;
    opacity: 0.9;
    font-weight: 400;
}

/* 卡片样式 */
.upload-card,
.controls-card,
.text-card {
    margin: 2px;
    padding: 3px;
    background: var(--background-tertiary);
    border-radius: var(--radius-medium);
    border: 1px solid var(--border-color);
}

.upload-card h3,
.controls-card h3,
.text-card h3 {
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 2px;
    color: var(--text-primary);
}

/* 文件上传区域 */
.upload-area {
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-medium);
    padding: 4px 3px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--background-secondary);
}

.upload-area:hover {
    border-color: var(--primary-blue);
    background: rgba(0, 122, 255, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary-blue);
    background: rgba(0, 122, 255, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    color: var(--text-tertiary);
    margin-bottom: 1px;
    font-size: 20px;
}

.upload-area h3 {
    font-size: 11px;
    font-weight: 600;
    margin-bottom: 0px;
    color: var(--text-primary);
}

.upload-area p {
    color: var(--text-secondary);
    font-size: 9px;
    margin: 0;
}

/* 文件信息显示 */
.file-info {
    display: flex;
    align-items: center;
    gap: 3px;
    padding: 3px;
    background: var(--background-secondary);
    border-radius: var(--radius-medium);
    border: 1px solid var(--border-color);
}

.file-preview {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-small);
    overflow: hidden;
    background: var(--background-primary);
}

.file-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-details {
    flex: 1;
}

.file-details span {
    display: block;
    font-size: 9px;
    color: var(--text-secondary);
    margin-bottom: 0px;
    line-height: 1.2;
}

.change-file-btn {
    background: none;
    border: none;
    color: var(--primary-blue);
    font-size: 9px;
    cursor: pointer;
    padding: 0;
    font-weight: 500;
}

/* 控制面板 */
.control-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.control-item label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

/* 滑块输入 */
.input-group {
    display: flex;
    align-items: center;
    gap: 3px;
}

.input-group input[type="range"] {
    flex: 1;
    min-width: 50px;
    height: 4px;
    border-radius: 2px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.input-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-blue);
    cursor: pointer;
    box-shadow: var(--shadow-light);
}

.input-group .value {
    font-size: 9px;
    color: var(--text-secondary);
    font-weight: 500;
    min-width: 28px;
    text-align: center;
    background: var(--bg-secondary);
    padding: 1px 3px;
    border-radius: 3px;
    border: 1px solid var(--border-color);
}

/* 文本输入框 */
.text-input {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-small);
    font-size: 12px;
    background: var(--background-secondary);
    transition: var(--transition);
}

.text-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.1);
}

/* 选择框 */
.select-input {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-small);
    font-size: 12px;
    background: var(--background-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.select-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.1);
}

/* 颜色行布局 */
.color-row {
    display: flex;
    gap: 3px;
    flex-wrap: wrap;
}

.color-group {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
}

.color-group-label {
    font-size: 8px;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1;
    min-width: 30px;
}

.control-row {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.control-group {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.control-group-label {
    font-size: 10px;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1;
    font-weight: 500;
}

/* 颜色选择器 */
.color-picker {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 2px 3px;
    background: var(--background-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-small);
    transition: var(--transition);
}

.color-picker input[type="color"] {
    width: 20px;
    height: 20px;
    border: none;
    border-radius: var(--radius-small);
    cursor: pointer;
    background: none;
}

.color-picker input[type="color"]::-webkit-color-swatch {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-small);
}

.color-label {
    font-size: 8px;
    color: var(--text-secondary);
    font-weight: 500;
    min-width: 20px;
    text-align: center;
    line-height: 1;
}

/* 文本输入区域 */
#subtitleText {
    width: 100%;
    height: 40px;
    padding: 6px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-medium);
    font-size: 12px;
    font-family: inherit;
    resize: vertical;
    background: var(--background-secondary);
    transition: var(--transition);
}

#subtitleText:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.text-info {
    display: flex;
    justify-content: space-between;
    margin-top: 4px;
    font-size: 10px;
    color: var(--text-tertiary);
}

/* 操作按钮 */
.action-buttons {
    padding: 8px;
    display: flex;
    flex-direction: row;
    gap: 6px;
}

.btn-primary,
.btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 8px 12px;
    border: none;
    border-radius: var(--radius-medium);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--primary-blue);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-blue-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: var(--background-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--background-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-light);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 右侧主内容区域 */
.main-content {
    flex: 1;
    max-width: 50%;
    display: flex;
    flex-direction: column;
    background: var(--background-primary);
}

.preview-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 12px;
    min-width: 0;
}

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

.preview-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

.preview-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--background-secondary);
    padding: 8px;
    border-radius: var(--radius-small);
    border: 1px solid var(--border-color);
}

.zoom-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition);
}

.zoom-btn:hover {
    background: var(--background-primary);
    color: var(--text-primary);
}

.zoom-level {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    min-width: 50px;
    text-align: center;
}

/* 预览区域 */
.preview-area {
    flex: 1;
    background: var(--background-secondary);
    border-radius: var(--radius-large);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: auto;
    max-height: calc(100vh - 140px);
    min-height: 400px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 24px 16px;
}

.empty-icon {
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.empty-state h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 300px;
    margin: 0 auto;
}

/* 预览包装器 */
.preview-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    overflow: auto;
}

#canvas {
    display: none;
}

#preview {
    max-width: calc(100% - 20px);
    max-height: calc(100% - 20px);
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-medium);
    box-shadow: var(--shadow-medium);
    transition: transform 0.2s ease;
    display: block;
    margin: auto;
}

#canvas {
    transition: transform 0.2s ease;
}

/* 响应式设计 - 优化多设备适配 */
@media (max-width: 1200px) {
    .app-container {
        flex-direction: column;
        margin: 16px;
        border-radius: var(--radius-medium);
        height: auto;
        min-height: 100vh;
    }
    
    .sidebar {
        width: 100%;
        max-width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        max-height: 50vh;
    }
    
    .main-content {
        width: 100%;
        max-width: 100%;
        min-height: 50vh;
    }
}

@media (max-width: 768px) {
    .app-container {
        margin: 8px;
        border-radius: var(--radius-small);
    }
    
    .header {
        padding: 16px 12px 12px;
    }
    
    .header h1 {
        font-size: 16px;
    }
    
    .upload-card,
    .controls-card,
    .text-card {
        margin: 8px;
        padding: 12px;
    }
    
    .action-buttons {
        padding: 12px;
        flex-direction: column;
    }
    
    .preview-container {
        padding: 12px;
    }
    
    .preview-header h2 {
        font-size: 18px;
    }
}

/* 移动端小屏幕适配 */
@media (max-width: 480px) {
    .app-container {
        margin: 4px;
        height: calc(100vh - 8px);
    }
    
    .sidebar {
        max-height: 40vh;
        overflow-y: auto;
    }
    
    .main-content {
        min-height: 60vh;
    }
    
    .upload-area h3 {
        font-size: 14px;
    }
    
    .btn-primary, .btn-secondary {
        padding: 10px;
        font-size: 14px;
    }
    
    .preview-area {
        min-height: 250px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 8px;
        text-align: center;
        font-size: 11px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.upload-card,
.controls-card,
.text-card {
    animation: fadeIn 0.6s ease-out;
}

.footer {
    background-color: var(--background-secondary);
    border-top: 1px solid var(--border-color);
    padding: 12px 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.footer .separator {
    color: var(--border-color);
}

/* 滚动条样式 */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--background-primary);
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}