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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

nav {
    background: #2c3e50;
    color: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav ul li a {
    color: #ecf0f1;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    background: #34495e;
}

.container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

h2 {
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

h3 {
    margin-bottom: 1rem;
    color: #34495e;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-left: 4px solid #3498db;
}

.stat-card.blue { border-left-color: #3498db; }
.stat-card.green { border-left-color: #2ecc71; }
.stat-card.orange { border-left-color: #e67e22; }
.stat-card.red { border-left-color: #e74c3c; }
.stat-card.yellow { border-left-color: #f39c12; }

.stat-card h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.stat-card p {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.section {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

table {
    width: 100%;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    border-collapse: collapse;
}

thead {
    background: #34495e;
    color: white;
}

th, td {
    padding: 1rem;
    text-align: left;
}

tbody tr {
    border-bottom: 1px solid #ecf0f1;
}

tbody tr:hover {
    background: #f8f9fa;
}

tbody tr.row-today {
    background: #fff3cd;
}

tbody tr.row-overdue {
    background: #f8d7da;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 0.9rem;
}

.btn:hover {
    background: #2980b9;
}

.btn-primary {
    background: #2ecc71;
}

.btn-primary:hover {
    background: #27ae60;
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #3498db;
    color: white;
    border-radius: 12px;
    font-size: 0.85rem;
}

.filters, .filter-section {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.filters form, .filter-section form {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.filters input, .filters select, .filter-section select {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.9rem;
}

.filter-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.filter-tabs a {
    padding: 0.5rem 1rem;
    background: white;
    color: #3498db;
    text-decoration: none;
    border-radius: 4px;
    border: 1px solid #3498db;
    transition: all 0.3s;
}

.filter-tabs a:hover,
.filter-tabs a.active {
    background: #3498db;
    color: white;
}

.company-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.company-meta {
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.company-actions {
    display: flex;
    gap: 1rem;
}

.company-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.company-info, .company-form {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.info-table {
    box-shadow: none;
    margin-bottom: 0;
}

.info-table th {
    background: transparent;
    color: #7f8c8d;
    font-weight: normal;
    width: 150px;
}

.info-table td {
    color: #2c3e50;
}

.info-table tbody tr:hover {
    background: transparent;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #34495e;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.search-form {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.search-form input {
    flex: 1;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: #7f8c8d;
    font-size: 1.1rem;
}

@media (max-width: 768px) {
    .company-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .company-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .company-actions {
        margin-top: 1rem;
        width: 100%;
    }
}