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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f7fa;
    min-height: 100vh;
    color: #333;
}

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

.header {
    text-align: center;
    margin-bottom: 40px;
}

.header-content {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border: 1px solid #e1e8ed;
}

.header-content i {
    font-size: 3rem;
    color: #4285f4;
    margin-bottom: 20px;
}

.header-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #1a202c;
}

.header-content p {
    font-size: 1.1rem;
    color: #718096;
}

.main-content {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border: 1px solid #e1e8ed;
}

.upload-section {
    margin-bottom: 30px;
}

.upload-area {
    border: 2px dashed #cbd5e0;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: #f7fafc;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: #4285f4;
    background: #ebf8ff;
}

.upload-content i {
    font-size: 3rem;
    color: #4285f4;
    margin-bottom: 20px;
}

.upload-content h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #2d3748;
}

.upload-content p {
    color: #718096;
    margin-bottom: 20px;
}

.browse-btn {
    background: #4285f4;
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 48px;
    vertical-align: middle;
}

.browse-btn:hover {
    background: #3367d6;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(66, 133, 244, 0.3);
}

.browse-btn i {
    font-size: 1rem;
    color: white !important;
    display: inline-block;
    line-height: 1;
    vertical-align: middle;
    margin: 0;
    padding: 0;
}

.file-info {
    background: #f7fafc;
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid #e2e8f0;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 15px;
}

.file-details i {
    font-size: 1.5rem;
    color: #4285f4;
}

.file-name {
    font-weight: 600;
    display: block;
    color: #2d3748;
}

.file-size {
    color: #718096;
    font-size: 0.9rem;
}

.remove-file {
    background: #f7fafc;
    color: #718096;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    margin-left: auto;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
}

.remove-file:hover {
    background: #e2e8f0;
    color: #4a5568;
    border-color: #cbd5e0;
    transform: translateY(-1px);
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    background: #f7fafc;
    border-radius: 8px;
    flex-wrap: wrap;
    gap: 20px;
    border: 1px solid #e2e8f0;
}

.control-group {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    color: #2d3748;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #cbd5e0;
    border-radius: 4px;
    margin-right: 10px;
    position: relative;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: #4285f4;
    border-color: #4285f4;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.export-buttons {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary {
    background: #718096;
    color: white;
}

.btn-secondary:hover {
    background: #4a5568;
    transform: translateY(-1px);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.results-header h2 {
    font-size: 1.8rem;
    color: #1a202c;
}

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

.stat-item {
    background: #4285f4;
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.window {
    background: white;
    border-radius: 8px;
    margin-bottom: 30px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1px solid #e2e8f0;
}

.window-header {
    background: #4285f4;
    color: white;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.window-header:hover {
    background: #3367d6;
}

.window-header i {
    font-size: 1.2rem;
}

.window-title {
    font-weight: 600;
    font-size: 1.1rem;
}

.window-toggle {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: all 0.3s ease;
    margin-left: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.window-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.window-toggle i {
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.window.collapsed .window-toggle i {
    transform: rotate(180deg);
}

.window.collapsed .tabs-container {
    display: none;
}

.window.deleted .window-header {
    background: #e53e3e;
}

.window.deleted .window-header:hover {
    background: #c53030;
}

.window.active .window-header::after {
    content: 'ACTIVE';
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-right: 10px;
}

.tabs-container {
    padding: 20px;
}

.tab {
    background: #f7fafc;
    border-radius: 8px;
    margin-bottom: 15px;
    padding: 20px;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
    border: 1px solid #e2e8f0;
}

.tab:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.tab.active {
    border-left-color: #4285f4;
    background: #ebf8ff;
    border-color: #bee3f8;
}

.tab.deleted {
    border-left-color: #e53e3e;
    background: #fed7d7;
    border-color: #feb2b2;
    opacity: 0.8;
}

.tab-header {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 10px;
}

.tab-favicon {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    flex-shrink: 0;
    margin-top: 2px;
}

.tab-content {
    flex: 1;
    min-width: 0;
}

.tab-title {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 5px;
    color: #1a202c;
    word-wrap: break-word;
}

.tab-url {
    color: #4285f4;
    font-size: 0.9rem;
    text-decoration: none;
    word-wrap: break-word;
    display: block;
}

.tab-url:hover {
    text-decoration: underline;
}

.tab-meta {
    display: flex;
    gap: 15px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.tab-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

.tab-badge.active {
    background: #bee3f8;
    color: #2b6cb0;
}

.tab-badge.deleted {
    background: #feb2b2;
    color: #c53030;
}

.tab-badge.group {
    background: #c6f6d5;
    color: #2f855a;
}

.tab-history {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e2e8f0;
}

.tab-history h4 {
    font-size: 0.9rem;
    color: #718096;
    margin-bottom: 10px;
}

.history-item {
    padding: 8px 0;
    border-bottom: 1px solid #f1f5f9;
}

.history-item:last-child {
    border-bottom: none;
}

.history-title {
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 3px;
    color: #2d3748;
}

.history-url {
    color: #718096;
    font-size: 0.8rem;
    text-decoration: none;
}

.history-url:hover {
    color: #4285f4;
    text-decoration: underline;
}

.error-message {
    background: #fed7d7;
    color: #742a2a;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid #feb2b2;
}

.error-message i {
    font-size: 1.2rem;
}

.loading {
    text-align: center;
    padding: 40px;
}

.spinner {
    border: 4px solid #f1f5f9;
    border-top: 4px solid #4285f4;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header-content {
        padding: 30px 20px;
    }
    
    .header-content h1 {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .control-group {
        justify-content: center;
    }
    
    .export-buttons {
        justify-content: center;
    }
    
    .results-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .stats {
        justify-content: center;
    }
    
    .tab-header {
        flex-direction: column;
        gap: 10px;
    }
    
    .tab-meta {
        justify-content: center;
    }
}