:root {
    --primary-color: #5b21b6;
    --secondary-color: #7c3aed;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
}

.back-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(-2px);
}

/* Dashboard Section */
.dashboard-section {
    margin-bottom: 30px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--bg-primary);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    opacity: 0.8;
}

.stat-content h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
    overflow-x: auto;
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 24px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

/* Tab Content */
.tab-content {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    gap: 20px;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    flex: 1;
    max-width: 400px;
}

.search-box i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(91, 33, 182, 0.1);
}

.filter-group {
    display: flex;
    gap: 12px;
    align-items: center;
}

.filter-select {
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Customer List */
.customer-list {
    display: grid;
    gap: 16px;
}

.customer-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.customer-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.customer-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 12px;
}

.customer-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.customer-actions {
    display: flex;
    gap: 8px;
}

.customer-actions button {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.customer-actions button:hover {
    background: var(--bg-primary);
    color: var(--primary-color);
}

.customer-details {
    display: grid;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.customer-detail {
    display: flex;
    align-items: center;
    gap: 8px;
}

.customer-detail i {
    width: 16px;
    text-align: center;
    color: var(--primary-color);
    opacity: 0.6;
}

/* Deals Pipeline */
.deals-pipeline {
    display: grid;
    gap: 20px;
}

.deal-card {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s ease;
}

.deal-card:hover {
    box-shadow: var(--shadow);
    transform: translateX(2px);
}

.deal-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 12px;
}

.deal-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.deal-stage {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.deal-stage.lead {
    background: #e0e7ff;
    color: #3730a3;
}

.deal-stage.qualified {
    background: #dbeafe;
    color: #1e40af;
}

.deal-stage.proposal {
    background: #fef3c7;
    color: #92400e;
}

.deal-stage.negotiation {
    background: #fed7aa;
    color: #9a3412;
}

.deal-stage.closed-won {
    background: #d1fae5;
    color: #065f46;
}

.deal-stage.closed-lost {
    background: #fee2e2;
    color: #991b1b;
}

.deal-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

.deal-info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.deal-info-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.deal-info-value {
    font-weight: 600;
    color: var(--text-primary);
}

/* Activities Timeline */
.activities-timeline {
    display: grid;
    gap: 16px;
}

.activity-item {
    display: flex;
    gap: 16px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.activity-item:hover {
    box-shadow: var(--shadow);
}

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.activity-icon.call {
    background: #e0e7ff;
    color: #3730a3;
}

.activity-icon.email {
    background: #dbeafe;
    color: #1e40af;
}

.activity-icon.meeting {
    background: #d1fae5;
    color: #065f46;
}

.activity-icon.note {
    background: #fef3c7;
    color: #92400e;
}

.activity-content {
    flex: 1;
}

.activity-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 8px;
}

.activity-subject {
    font-weight: 600;
    color: var(--text-primary);
}

.activity-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.activity-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.activity-meta {
    display: flex;
    gap: 16px;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.activity-meta-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.close-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-form {
    padding: 24px;
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(91, 33, 182, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

/* Loading Spinner */
.loading-spinner {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2000;
}

.loading-spinner.active {
    display: block;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 4rem;
    opacity: 0.3;
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.empty-state p {
    margin-bottom: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .header {
        padding: 20px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    
    .stat-card {
        padding: 16px;
    }
    
    .stat-card i {
        font-size: 2rem;
    }
    
    .stat-content h3 {
        font-size: 1.3rem;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-box {
        max-width: none;
    }
    
    .nav-tabs {
        gap: 4px;
    }
    
    .tab-btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
    
    .tab-content {
        padding: 20px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .deal-info {
        grid-template-columns: 1fr;
    }
    
    .activity-item {
        flex-direction: column;
        text-align: center;
    }
    
    .activity-header {
        flex-direction: column;
        gap: 4px;
    }
    
    .activity-meta {
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .customer-header {
        flex-direction: column;
        gap: 8px;
    }
    
    .customer-actions {
        align-self: flex-start;
    }
}