/* 全局样式 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f5f5f5;
    --dark-bg: #333;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

h2 {
    color: var(--text-color);
    font-size: 1.8rem;
    margin-bottom: 20px;
    text-align: center;
}

h3 {
    color: var(--text-color);
    font-size: 1.3rem;
    margin-bottom: 15px;
}

/* 步骤导航 */
.steps {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    position: relative;
}

.steps::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    background-color: #ddd;
    z-index: 1;
}

.step {
    position: relative;
    background-color: white;
    padding: 10px 20px;
    border-radius: 30px;
    font-weight: bold;
    z-index: 2;
    cursor: default;
    border: 2px solid #ddd;
    transition: var(--transition);
}

.step.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.step.completed {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

/* 步骤内容 */
.step-content {
    display: none;
    background-color: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
}

.step-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: var(--transition);
    margin: 0 5px;
}

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

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

.btn.primary:hover:not(:disabled) {
    background-color: #2980b9;
}

.btn.secondary {
    background-color: #95a5a6;
    color: white;
}

.btn.secondary:hover:not(:disabled) {
    background-color: #7f8c8d;
}

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

.btn.danger:hover:not(:disabled) {
    background-color: #c0392b;
}

/* 控制按钮容器 */
.controls {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

/* 摄像头样式 */
.camera-container {
    width: 100%;
    max-width: 640px;
    margin: 0 auto 20px;
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

#camera-preview, #recorded-preview {
    width: 100%;
    height: auto;
    display: block;
    background-color: #000;
}

.camera-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 15px;
    background-color: rgba(0, 0, 0, 0.7);
}

.timer {
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
    margin-left: 15px;
    min-width: 60px;
    text-align: center;
}

/* 视频预览 */
.video-preview {
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
}

/* 帧选择网格 */
.frames-container {
    margin-bottom: 20px;
}

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

.frame-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

.frame-item img {
    width: 100%;
    height: auto;
    display: block;
}

.frame-item.selected {
    border: 4px solid var(--primary-color);
    transform: scale(1.05);
}

.frame-item.selected::after {
    content: '✓';
    position: absolute;
    top: 10px;
    right: 10px;
    width: 30px;
    height: 30px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
}

/* 背景选择 */
#backgrounds-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.background-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
    height: 100px;
}

.background-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.background-item.selected {
    border: 3px solid var(--primary-color);
    transform: scale(1.05);
}

/* 选择的照片预览 */
.selected-photo {
    margin-bottom: 20px;
    text-align: center;
}

#selected-photo-preview {
    max-width: 300px;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* 提示词选择 */
.prompt {
    margin-bottom: 20px;
}

#prompt-select {
    width: 100%;
    padding: 10px;
    border-radius: var(--border-radius);
    border: 1px solid #ddd;
    font-size: 1rem;
}

/* 生成的图像网格 */
#generated-images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.generated-image-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.generated-image-item img {
    width: 100%;
    height: auto;
    display: block;
}

.generated-image-item:hover {
    transform: scale(1.03);
}

.generated-image-item .download-btn {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background-color: var(--primary-color);
    color: white;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    transition: var(--transition);
}

.generated-image-item:hover .download-btn {
    opacity: 1;
}

/* 加载动画 */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(0, 0, 0, 0.1);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 页脚 */
footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    color: #777;
    font-size: 0.9rem;
}

/* 错误消息样式 */
.error-message,
.warning-message {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    border-radius: var(--border-radius);
}

.warning-message {
    background-color: rgba(241, 196, 15, 0.9);
}

.message-content {
    background-color: white;
    padding: 20px;
    border-radius: var(--border-radius);
    max-width: 80%;
    text-align: center;
    box-shadow: var(--box-shadow);
}

.error-message h3 {
    color: var(--danger-color);
    margin-bottom: 15px;
}

.warning-message h3 {
    color: #d35400;
    margin-bottom: 15px;
}

.error-message ul,
.warning-message ul {
    text-align: left;
    margin: 15px 0;
    padding-left: 20px;
}

.error-message li,
.warning-message li {
    margin-bottom: 5px;
}

/* 图片上传样式 */
.upload-container {
    padding: 20px;
    text-align: center;
}

.upload-container h3 {
    margin-bottom: 10px;
}

.upload-container p {
    margin-bottom: 20px;
    color: #666;
}

#photo-upload {
    display: none;
}

.upload-container label.btn {
    display: inline-block;
    margin-bottom: 20px;
}

.upload-preview {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.upload-preview-img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

.upload-preview-img.selected {
    border: 4px solid var(--primary-color);
    transform: scale(1.05);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .step {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    .step-content {
        padding: 20px;
    }
    
    #frames-grid, #backgrounds-grid, #generated-images-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .message-content {
        max-width: 95%;
        padding: 15px;
    }
    
    .upload-preview-img {
        width: 120px;
        height: 120px;
    }
}