:root {
    --primary: #4a6fa5;
    --secondary: #166088;
    --accent: #4fc3f7;
    --light: #f8f9fa;
    --dark: #343a40;
    --success: #28a745;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #17a2b8;
}

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

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: var(--dark);
    padding: 20px;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    width: 100%;
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px 30px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    color: var(--primary);
    font-size: 1.8rem;
}

.nav {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    background-color: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.nav a:hover {
    background-color: var(--primary);
    color: white;
}

.card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 20px;
    width: 100%;
    transition: transform 0.3s ease;
}

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

.card h2 {
    color: var(--primary);
    margin-bottom: 10px;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 5px;
}

.card a {
    color: var(--secondary);
    text-decoration: none;
    font-weight: 500;
}

.card a:hover {
    text-decoration: underline;
}

.client-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    width: 100%;
}

.btn {
    display: inline-block;
    padding: 8px 16px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: var(--secondary);
}

.btn-success {
    background-color: var(--success);
}

.btn-success:hover {
    background-color: #218838;
}

.btn-danger {
    background-color: var(--danger);
}

.btn-danger:hover {
    background-color: #c82333;
}

form {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 600px;
    gap: 15px;
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

form label {
    font-weight: 500;
    margin-bottom: 5px;
}

form input, form select, form textarea {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

form input:focus, form select:focus, form textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(74, 111, 165, 0.2);
}

form button {
    margin-top: 10px;
    padding: 10px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

form button:hover {
    background-color: var(--secondary);
}

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

.stat-item {
    background-color: var(--light);
    padding: 12px;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.stat-item:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
}

.stat-item strong {
    color: var(--primary);
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 10px;
}

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

.info-item {
    padding: 10px;
    background-color: var(--light);
    border-radius: 6px;
}

.info-item strong {
    color: var(--primary);
    font-weight: 600;
}

.financial-summary {
    display: flex;
    gap: 30px;
    margin-top: 15px;
}

.summary-item {
    padding: 15px;
    background-color: var(--light);
    border-radius: 6px;
    font-size: 1.1rem;
}

.activity-list {
    margin-top: 15px;
}

.activity-item {
    background-color: var(--light);
    border-radius: 6px;
    margin-bottom: 15px;
    overflow: hidden;
}

.activity-header {
    background-color: var(--primary);
    color: white;
    padding: 10px 15px;
    display: flex;
    justify-content: space-between;
}

.activity-type {
    font-weight: 600;
}

.activity-content {
    padding: 15px;
}

.invoice-list {
    margin-top: 15px;
}

.invoice-item {
    background-color: var(--light);
    border-radius: 6px;
    margin-bottom: 15px;
    overflow: hidden;
}

.invoice-header {
    background-color: var(--secondary);
    color: white;
    padding: 10px 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.invoice-number {
    font-weight: 600;
}

.invoice-status {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.invoice-status.paid {
    background-color: var(--success);
}

.invoice-status.unpaid {
    background-color: var(--warning);
}

.invoice-status.cancelled {
    background-color: var(--danger);
}

.invoice-details {
    padding: 15px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.meeting-list {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 10px;
    background-color: var(--light);
}

.meeting-item {
    padding: 10px;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    align-items: center;
}

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

.meeting-item input[type="checkbox"] {
    margin-right: 10px;
}

.inquiry-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
}

.inquiry-details {
    margin: 15px 0;
}

.inquiry-details p {
    margin-bottom: 8px;
}

.inquiry-details strong {
    color: var(--primary);
}

.inquiry-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 10px;
}

.checkbox-label span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.footer {
    margin-top: auto;
    width: 100%;
    text-align: center;
    padding: 20px;
    color: #6c757d;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
    
    .client-list {
        grid-template-columns: 1fr;
    }
    
    form {
        width: 90%;
    }
}