* {
    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: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 40px;
}

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

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

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

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

.file-label {
    display: inline-block;
    padding: 15px 30px;
    background: #667eea;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 1.1em;
    font-weight: 500;
}

.file-label:hover {
    background: #5568d3;
}

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

.file-name {
    margin-top: 15px;
    color: #666;
    font-size: 0.95em;
}

.data-section {
    margin-top: 30px;
}

.controls {
    margin-bottom: 20px;
}

.controls h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

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

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

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

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.4);
}

.table-container {
    overflow-x: auto;
    margin-top: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
}

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

thead {
    background: #667eea;
    color: white;
}

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid #5568d3;
}

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

tbody tr:hover {
    background: #f8f9fa;
}

tbody tr:last-child td {
    border-bottom: none;
}

#pdfSection {
    margin-top: 30px;
}

#pdfSection h2 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.5em;
}

.pdf-controls {
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.pdf-preview {
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    background: #f8f9fa;
    min-height: 600px;
}

.event-info-section {
    margin-top: 30px;
    margin-bottom: 30px;
    padding: 25px;
    background: #f0f4ff;
    border-radius: 8px;
    border: 1px solid #d0d8ff;
}

.event-info-section h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.5em;
}

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

.event-label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #333;
    font-weight: 500;
    flex: 1;
    min-width: 200px;
}

.event-label input[type="text"] {
    padding: 10px 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.event-label input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

.event-info-section {
    margin-top: 30px;
    margin-bottom: 30px;
    padding: 25px;
    background: #f0f4ff;
    border-radius: 8px;
    border: 1px solid #d0d8ff;
}

.event-info-section h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.5em;
}

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

.event-label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: #333;
    font-weight: 500;
    flex: 1;
    min-width: 200px;
}

.event-label input[type="text"] {
    padding: 10px 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.event-label input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

.name-ranges-section {
    margin-top: 30px;
    margin-bottom: 30px;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.name-ranges-section h2 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1.5em;
}

.name-ranges-section > p {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.95em;
}

.range-controls {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.range-label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #333;
    font-weight: 500;
}

.range-label input[type="number"] {
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1em;
    width: 80px;
    transition: border-color 0.3s;
}

.range-label input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
}

.ranges-container {
    display: flex;
    flex-direction: row;
    gap: 20px;
}

.name-range-item {
    padding: 20px;
    background: white;
    border-radius: 8px;
    border: 1px solid #ddd;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.name-range-item h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.2em;
    font-weight: 600;
}

.dropdowns-wrapper {
    display: flex;
    gap: 20px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.dropdown-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 120px;
}

.dropdown-wrapper label {
    color: #555;
    font-size: 0.9em;
    font-weight: 500;
}

.letter-dropdown {
    padding: 10px 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1em;
    background: white;
    color: #333;
    cursor: pointer;
    transition: all 0.3s;
}

.letter-dropdown:hover {
    border-color: #667eea;
}

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

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

    header h1 {
        font-size: 2em;
    }

    .button-group,
    .pdf-controls {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .range-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .range-label {
        flex-direction: column;
        align-items: flex-start;
    }

    .dropdowns-wrapper {
        flex-direction: column;
    }

    .dropdown-wrapper {
        width: 100%;
    }
}