* {
    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;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    padding: 30px;
}

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

header h1 {
    color: #333;
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    color: #666;
    font-size: 1.1em;
}

.upload-section {
    text-align: center;
    margin-bottom: 30px;
    padding: 40px;
    border: 2px dashed #ddd;
    border-radius: 8px;
    background: #f9f9f9;
}

.file-label {
    display: inline-block;
    padding: 15px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s;
    font-size: 1.1em;
}

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

.file-icon {
    font-size: 1.5em;
    margin-right: 10px;
}

#fileInput {
    display: none;
}

.file-name {
    display: block;
    margin-top: 15px;
    color: #666;
    font-size: 1em;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
    padding: 20px;
    background: #f5f5f5;
    border-radius: 8px;
    align-items: flex-end;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.control-group label {
    font-weight: 600;
    color: #333;
    font-size: 0.9em;
}

.control-group input,
.control-group select {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1em;
    min-width: 200px;
}

.control-group input:focus,
.control-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.export-group {
    margin-left: auto;
    flex-direction: row;
    gap: 10px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

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

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.table-container {
    margin-top: 20px;
}

.table-info {
    display: flex;
    gap: 10px;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 6px;
    margin-bottom: 15px;
    font-weight: 600;
    color: #666;
}

.separator {
    color: #ddd;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    position: relative;
}

th:hover {
    background: rgba(255, 255, 255, 0.1);
}

th.sortable::after {
    content: ' ↕';
    opacity: 0.5;
    font-size: 0.8em;
}

th.sort-asc::after {
    content: ' ↑';
    opacity: 1;
}

th.sort-desc::after {
    content: ' ↓';
    opacity: 1;
}

td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
}

tbody tr:hover {
    background: #f8f9fa;
}

tbody tr:nth-child(even) {
    background: #fafafa;
}

tbody tr:nth-child(even):hover {
    background: #f0f0f0;
}

.hidden {
    display: none !important;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    border-radius: 12px;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid #eee;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px 12px 0 0;
}

.modal-header h2 {
    margin: 0;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 2em;
    cursor: pointer;
    color: white;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.2s;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.stats-content {
    padding: 30px;
}

.stats-column {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.stats-column h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background: white;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.stat-label {
    font-weight: 600;
    color: #666;
}

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

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .controls {
        flex-direction: column;
    }

    .export-group {
        margin-left: 0;
        width: 100%;
    }

    .control-group input,
    .control-group select {
        min-width: 100%;
    }

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