:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --secondary-color: #9C27B0;
    --background-color: #f8f9fa;
    --surface-color: #ffffff;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    padding-bottom: 80px;
}

/* Header */
.app-header {
    background: var(--surface-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.app-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* Main Content */
.app-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

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

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

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

.metric-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-color);
    border-radius: 50%;
}

.metric-content h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.metric-trend {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.metric-trend.positive {
    color: var(--success-color);
}

.metric-trend.negative {
    color: var(--danger-color);
}

/* Action Cards */
.action-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.action-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.action-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.action-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: #1976D2;
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: #e9ecef;
}

/* Analytics */
.time-filter {
    display: flex;
    gap: 0.5rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-secondary);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.chart-container {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.chart-container h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.chart-container canvas {
    width: 100% !important;
    height: 200px !important;
}

.insights-panel {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.insights-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.insight-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.insight-icon {
    font-size: 1.25rem;
    margin-top: 0.125rem;
}

.insight-content h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.insight-content p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Feedback */
.feedback-stats {
    display: flex;
    justify-content: space-around;
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.feedback-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feedback-item {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.feedback-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.feedback-customer {
    font-weight: 600;
    color: var(--text-primary);
}

.feedback-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.feedback-rating {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.feedback-comment {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

.feedback-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.feedback-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.btn-icon {
    padding: 0.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.btn-icon:hover {
    background: var(--background-color);
    color: var(--text-primary);
}

.btn-icon.delete:hover {
    color: var(--danger-color);
}

/* Goals */
.goals-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.goal-item {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.goal-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.goal-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.goal-priority {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.goal-priority.high {
    background: var(--danger-color);
    color: white;
}

.goal-priority.medium {
    background: var(--warning-color);
    color: var(--text-primary);
}

.goal-priority.low {
    background: var(--success-color);
    color: white;
}

.goal-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.goal-progress {
    margin-bottom: 1rem;
}

.goal-progress-text {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.goal-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--background-color);
    border-radius: 4px;
    overflow: hidden;
}

.goal-progress-fill {
    height: 100%;
    background: var(--success-color);
    transition: width 0.3s ease;
}

.goal-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.goal-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

/* Empty States */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--border-color);
}

.empty-state h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.empty-state p {
    font-size: 0.875rem;
    line-height: 1.5;
}

/* FAQ */
.faq-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 1.25rem;
    border: none;
    background: transparent;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--background-color);
}

.faq-question[aria-expanded="true"] {
    background: var(--background-color);
}

.faq-icon {
    font-size: 1.25rem;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.25rem 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
    animation: slideDown 0.3s ease;
}

.faq-answer[hidden] {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    padding: 1rem;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--background-color);
    color: var(--text-primary);
}

.modal-form {
    padding: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.rating-input {
    display: flex;
    gap: 0.5rem;
}

.rating-input input[type="radio"] {
    display: none;
}

.rating-input label {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--border-color);
    transition: var(--transition);
}

.rating-input input[type="radio"]:checked ~ label,
.rating-input input[type="radio"]:checked + label {
    color: var(--warning-color);
}

.rating-input label:hover {
    color: var(--warning-color);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 0.75rem 0;
    z-index: 100;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    min-width: 60px;
}

.nav-item i {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.nav-item.active {
    color: var(--primary-color);
}

.nav-item:hover {
    color: var(--primary-color);
    background: rgba(33, 150, 243, 0.1);
}

/* Footer */
footer {
    background: var(--surface-color);
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header h1 {
        font-size: 1rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .metric-card {
        padding: 1rem;
    }
    
    .metric-value {
        font-size: 1.5rem;
    }
    
    .action-cards {
        grid-template-columns: 1fr;
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
    
    .feedback-stats {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .time-filter {
        justify-content: center;
    }
    
    .goal-header {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .goal-meta {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .modal {
        padding: 0.5rem;
    }
    
    .modal-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .app-main {
        padding: 0.75rem;
    }
    
    .metric-card {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    
    .feedback-header {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .bottom-nav {
        padding: 0.5rem 0;
    }
    
    .nav-item {
        font-size: 0.625rem;
        min-width: 50px;
    }
    
    .nav-item i {
        font-size: 1rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus indicators */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
.nav-item:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow: 0 2px 4px rgba(0,0,0,0.3);
        --shadow-lg: 0 4px 12px rgba(0,0,0,0.4);
    }
}