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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 900px;
    width: 100%;
    padding: 40px;
}

h1 {
    color: #333;
    margin-bottom: 10px;
    font-size: 32px;
}

.subtitle {
    color: #666;
    margin-bottom: 30px;
    font-size: 16px;
}

.upload-area {
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9ff;
    margin-bottom: 30px;
}

    .upload-area:hover {
        border-color: #764ba2;
        background: #f0f2ff;
        transform: translateY(-2px);
    }

    .upload-area.dragover {
        border-color: #764ba2;
        background: #e8ebff;
        transform: scale(1.02);
    }

.upload-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.upload-text {
    font-size: 18px;
    color: #333;
    margin-bottom: 10px;
    font-weight: 600;
}

.upload-hint {
    color: #666;
    font-size: 14px;
}

#fileInput {
    display: none;
}

.file-list {
    margin-top: 20px;
}

.file-item {
    background: #f8f9ff;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid #e0e5ff;
    transition: all 0.3s ease;
}

    .file-item:hover {
        box-shadow: 0 4px 12px rgba(102, 126, 234, 0.15);
    }

.file-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.file-name {
    font-weight: 600;
    color: #333;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-status {
    font-size: 14px;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 500;
}

.status-waiting {
    background: #fff3cd;
    color: #856404;
}

.status-converting {
    background: #cce5ff;
    color: #004085;
}

.status-done {
    background: #d4edda;
    color: #155724;
}

.status-error {
    background: #f8d7da;
    color: #721c24;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e0e5ff;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    transition: width 0.3s ease;
}

.file-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    }

.btn-secondary {
    background: #f0f2ff;
    color: #667eea;
    border: 2px solid #667eea;
}

    .btn-secondary:hover {
        background: #667eea;
        color: white;
    }

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.stats {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.stat-item {
    background: #f8f9ff;
    padding: 15px 20px;
    border-radius: 10px;
    flex: 1;
    min-width: 150px;
}

.stat-label {
    font-size: 14px;
    color: #666;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: #333;
}

.preview-image {
    max-width: 100%;
    max-height: 200px;
    border-radius: 8px;
    margin-top: 10px;
    display: none;
}

    .preview-image.show {
        display: block;
    }

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 24px;
    }

    .upload-area {
        padding: 40px 15px;
    }

    .action-buttons {
        flex-direction: column;
    }

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

.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid #fff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.8s linear infinite;
}

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

.banner {
    width: 728px;
    max-width: 100%;
    height: 90px;
    margin-bottom: 20px;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
}

    .banner img {
        max-width: 100%;
        width: 728px;
        height: 90px;
        object-fit: contain;
    }

.seo-content {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid #e0e5ff;
    color: #444;
    line-height: 1.7;
}

    .seo-content h2 {
        color: #333;
        margin-bottom: 10px;
        margin-top: 25px;
        font-size: 24px;
    }

    .seo-content p {
        margin-bottom: 15px;
    }

    .seo-content ol {
        padding-left: 25px;
    }