/* 全局样式 */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* 上传区域 */
.upload-zone {
    background: var(--card-bg);
    border: 2px dashed var(--border-color);
    border-radius: 16px;
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 2rem;
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary-color);
    background: #f0f0ff;
}

.upload-content {
    max-width: 400px;
    margin: 0 auto;
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-content p {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-content label {
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: underline;
}

.upload-content label:hover {
    color: var(--primary-hover);
}

.hint {
    font-size: 0.9rem !important;
    color: var(--text-secondary) !important;
}

/* 预览区域 */
.preview-section {
    margin-bottom: 2rem;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.preview-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.preview-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.image-container {
    background: #f1f5f9;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 1rem;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-container img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
}

.meta-info {
    background: #fef3c7;
    border-radius: 8px;
    padding: 1rem;
}

.meta-info h4 {
    font-size: 0.9rem;
    color: var(--warning-color);
    margin-bottom: 0.5rem;
}

.meta-info ul {
    list-style: none;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.meta-info li {
    padding: 0.25rem 0;
    padding-left: 1.2rem;
    position: relative;
}

.meta-info li::before {
    content: '📍';
    position: absolute;
    left: 0;
}

.meta-info .success {
    color: var(--success-color);
    font-weight: 600;
}

/* 按钮 */
.actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: #e2e8f0;
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #cbd5e1;
}

/* 进度条 */
.progress-section {
    text-align: center;
    padding: 3rem;
    background: var(--card-bg);
    border-radius: 16px;
    margin-bottom: 2rem;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* 统计区域 */
.stats-section {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem 2.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 页脚 */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.8rem;
    }

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

    .stats-section {
        flex-direction: column;
        align-items: center;
    }

    .actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }
}