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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f6fa;
    color: #2c3e50;
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

/* Tarjetas de resumen */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    color: #7f8c8d;
    margin-bottom: 10px;
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.number {
    font-size: 2.5em;
    font-weight: bold;
    color: #2c3e50;
}

/* Grupos */
.groups-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.groups-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.group-card {
    background: #f8f9fa;
    border-left: 4px solid #3498db;
    padding: 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.group-card:hover {
    background: #e3f2fd;
    transform: translateX(5px);
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.group-name {
    font-weight: bold;
    color: #2c3e50;
}

.group-count {
    background: #3498db;
    color: white;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8em;
}

.article-list {
    list-style: none;
}

.article-item {
    padding: 8px 0;
    border-bottom: 1px solid #ecf0f1;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    transition: background-color 0.2s ease;
}

.article-item:hover {
    background-color: #e8f4fc;
    padding-left: 10px;
}

.article-count {
    background: #95a5a6;
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.8em;
}

/* Sección de detalle */
.detail-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.detail-info {
    margin: 20px 0;
}

.total-count {
    background: #2ecc71;
    color: white;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #34495e;
    color: white;
    font-weight: 600;
}

tr:hover {
    background-color: #f5f5f5;
}

.back-btn {
    background: #7f8c8d;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s ease;
}

.back-btn:hover {
    background: #95a5a6;
}

/* Filtros */
.filters {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.filter-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

select {
    padding: 8px 15px;
    border: 1px solid #bdc3c7;
    border-radius: 5px;
    background: white;
}

.filter-btn {
    background: #3498db;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
}

.clear-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    .groups-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    select, button {
        width: 100%;
    }
}