/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #f9fafb;
    --bg-secondary: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 2rem 1rem;
}

/* 容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* 头部 */
.header {
    text-align: center;
    margin-bottom: 3rem;
    color: white;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1.125rem;
    opacity: 0.95;
}

/* 主要内容区域 */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* 卡片样式 */
.card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-xl);
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

/* 表单样式 */
.form-group {
    margin-bottom: 2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
}

.label-text {
    font-size: 1rem;
}

.label-required {
    color: var(--error-color);
    margin-left: 0.25rem;
}

/* 上传区域 */
.upload-area {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.02);
}

.upload-area input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    pointer-events: none; /* 防止桌面端叠加点击导致二次弹窗 */
}

.upload-placeholder {
    color: var(--text-secondary);
}

.upload-placeholder svg {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-placeholder p {
    margin: 0.5rem 0;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 移动端上传按钮 */
.mobile-upload-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 10;
    pointer-events: auto;
}

.mobile-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 500;
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    position: relative;
    z-index: 11;
    pointer-events: auto;
}

.camera-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.camera-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.gallery-btn {
    background: var(--text-secondary);
}

.gallery-btn:hover {
    background: #4b5563;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.mobile-btn svg {
    flex-shrink: 0;
}

/* 预览容器 */
.preview-container {
    position: relative;
}

.preview-container img {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-md);
    object-fit: contain;
}

.remove-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 2rem;
    height: 2rem;
    border: none;
    border-radius: 50%;
    background: var(--error-color);
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.remove-btn:hover {
    background: #dc2626;
    transform: scale(1.1);
}

/* 选择网格 */
.select-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.select-item {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.select-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.select-item.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    box-shadow: var(--shadow-md);
}

.select-item-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.select-item-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 提交按钮 */
.submit-btn {
    width: 100%;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* 加载动画 */
.spinner {
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* 结果区域 */
.result-placeholder {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.result-placeholder svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.result-loading {
    text-align: center;
    padding: 4rem 2rem;
}

.loading-spinner {
    width: 4rem;
    height: 4rem;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 0.8s linear infinite;
}

.loading-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* 结果内容 */
.result-content {
    animation: fadeIn 0.5s ease;
}

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

/* 图片网格 */
.result-images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

/* 图片卡片 */
.image-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.image-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.image-card.selected {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.image-card-checkbox {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 10;
}

.image-card-checkbox input[type="checkbox"] {
    width: 1.5rem;
    height: 1.5rem;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.image-card-image {
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--bg-primary);
}

.image-card-image img {
    width: 100%;
    height: 100%;
    object-fit: contain; /* 保证图片完整显示，避免上下被裁剪 */
    display: block;
    transition: transform 0.3s ease;
}

.image-card:hover .image-card-image img {
    transform: scale(1.05);
}

.image-card-actions {
    padding: 0.75rem;
    display: flex;
    justify-content: center;
    background: var(--bg-secondary);
}

.image-card-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.image-card-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.image-card-number {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border-radius: 50%;
    font-size: 0.875rem;
    font-weight: 600;
    z-index: 10;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .result-images-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

.result-info {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.info-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.info-value {
    font-weight: 600;
    color: var(--text-primary);
}

.result-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.action-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.download-btn,
.download-selected-btn {
    background: var(--success-color);
    color: white;
}

.download-btn:hover,
.download-selected-btn:hover {
    background: #059669;
    transform: translateY(-1px);
}

.reset-btn {
    background: var(--text-secondary);
    color: white;
}

.reset-btn:hover {
    background: #4b5563;
    transform: translateY(-1px);
}

/* 错误状态 */
.result-error {
    text-align: center;
    padding: 3rem 2rem;
    animation: fadeIn 0.5s ease;
}

.result-error svg {
    color: var(--error-color);
    margin-bottom: 1rem;
}

.error-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--error-color);
    margin-bottom: 0.5rem;
}

.error-message {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* 底部 */
.footer {
    text-align: center;
    color: white;
    opacity: 0.9;
    padding: 1rem;
}

.footer p {
    font-size: 0.875rem;
}

/* 响应式调整 */
@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }

    .header h1 {
        font-size: 2rem;
    }

    .card {
        padding: 1.5rem;
    }

    .select-grid {
        grid-template-columns: 1fr;
    }

    .result-actions {
        flex-direction: column;
    }
    
    .mobile-upload-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .mobile-btn {
        width: 100%;
        justify-content: center;
    }
    
    .upload-area {
        padding: 1.5rem 1rem;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}