:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    --white: #ffffff;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #757575;
    --text-color: #333333;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    color: var(--text-color);
    line-height: 1.6;
    padding-bottom: 80px;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    color: var(--white);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

.header-content h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.sync-btn {
    background: rgba(255,255,255,0.2);
    border: none;
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.sync-btn:hover {
    background: rgba(255,255,255,0.3);
}

.sync-btn.syncing i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

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

.content-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: var(--white);
    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: 0 4px 12px rgba(0,0,0,0.15);
}

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

.total-followers .metric-icon { background: rgba(33, 150, 243, 0.1); }
.total-engagement .metric-icon { background: rgba(76, 175, 80, 0.1); }
.total-revenue .metric-icon { background: rgba(255, 193, 7, 0.1); }
.reach .metric-icon { background: rgba(156, 39, 176, 0.1); }

.metric-info h3 {
    font-size: 0.9rem;
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.metric-change {
    font-size: 0.8rem;
    font-weight: 600;
}

.metric-change.positive { color: var(--success-color); }
.metric-change.negative { color: var(--danger-color); }

/* Chart Container */
.chart-container {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

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

#performanceChart {
    width: 100%;
    height: 300px;
    max-width: 100%;
}

/* Platforms Overview */
.platforms-overview {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

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

.platform-card {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 1rem;
    text-align: center;
    transition: var(--transition);
}

.platform-card:hover {
    transform: translateY(-2px);
}

.platform-card i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.platform-card.instagram i { color: #E4405F; }
.platform-card.youtube i { color: #FF0000; }
.platform-card.tiktok i { color: #000000; }
.platform-card.twitter i { color: #1DA1F2; }

.platform-card h4 {
    margin-bottom: 0.5rem;
}

.platform-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--dark-gray);
}

/* Top Content */
.top-content {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.content-list {
    margin-top: 1rem;
}

.content-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--medium-gray);
    transition: var(--transition);
}

.content-item:hover {
    background: var(--light-gray);
}

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

.content-info h5 {
    margin-bottom: 0.25rem;
}

.content-info p {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.content-metrics {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.content-metrics span {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

/* Analytics Section */
.analytics-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.date-filter select {
    padding: 0.5rem;
    border: 1px solid var(--medium-gray);
    border-radius: var(--border-radius);
    background: var(--white);
}

.analytics-tabs {
    display: flex;
    background: var(--white);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.tab-btn {
    flex: 1;
    padding: 1rem;
    border: none;
    background: var(--white);
    cursor: pointer;
    transition: var(--transition);
    border-right: 1px solid var(--medium-gray);
}

.tab-btn:last-child {
    border-right: none;
}

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

.tab-btn:hover:not(.active) {
    background: var(--light-gray);
}

.tab-content {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.tab-panel {
    display: none;
}

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

/* Demographics */
.demographics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.demo-card {
    background: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 1rem;
}

.demo-card h5 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.age-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.age-bar-fill {
    height: 20px;
    background: var(--primary-color);
    border-radius: 10px;
    margin: 0 1rem;
    flex: 1;
    position: relative;
}

.gender-item, .location-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    background: var(--white);
    border-radius: var(--border-radius);
}

/* Insights Section */
.insights-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.insight-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.insight-card.warning {
    border-left-color: var(--warning-color);
}

.insight-card.success {
    border-left-color: var(--success-color);
}

.insight-card h4 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.insight-card p {
    color: var(--dark-gray);
    margin-bottom: 1rem;
}

.insight-action {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.insight-action:hover {
    background: #1976D2;
}

.recommendations {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.recommendation-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--medium-gray);
}

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

.recommendation-icon {
    font-size: 1.5rem;
    width: 40px;
    text-align: center;
}

.recommendation-content h5 {
    margin-bottom: 0.25rem;
}

.recommendation-content p {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

/* Settings Section */
.settings-section {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.settings-section h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.platform-connections {
    display: grid;
    gap: 1rem;
}

.platform-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--light-gray);
    border-radius: var(--border-radius);
}

.platform-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.platform-info i {
    font-size: 1.5rem;
}

.connect-btn {
    background: var(--success-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.connect-btn:hover {
    background: #388E3C;
}

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

.form-group {
    margin-bottom: 1rem;
}

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

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

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
}

.save-btn {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

.save-btn:hover {
    background: #1976D2;
}

.data-management {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.action-btn {
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--primary-color);
    color: var(--white);
}

.action-btn:hover {
    background: #1976D2;
}

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

.action-btn.danger:hover {
    background: #D32F2F;
}

/* FAQ Section */
.faq-section {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

.faq-section h2 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.faq-item {
    border-bottom: 1px solid var(--medium-gray);
}

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

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

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

.faq-icon {
    font-size: 1.2rem;
    font-weight: bold;
    transition: var(--transition);
}

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

.faq-answer {
    padding: 0 1rem 1rem 1rem;
    color: var(--dark-gray);
    line-height: 1.6;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer:not([hidden]) {
    max-height: 200px;
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-top: 1px solid var(--medium-gray);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    z-index: 1000;
    box-shadow: 0 -2px 8px rgba(0,0,0,0.1);
}

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

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

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

.nav-item:hover:not(.active) {
    color: var(--primary-color);
}

/* Footer */
footer {
    text-align: center;
    padding: 1rem;
    color: var(--dark-gray);
    font-size: 0.9rem;
    background: var(--white);
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-main {
        padding: 0.5rem;
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .metric-card {
        padding: 1rem;
    }
    
    .header-content h1 {
        font-size: 1.2rem;
    }
    
    .analytics-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        border-right: none;
        border-bottom: 1px solid var(--medium-gray);
    }
    
    .tab-btn:last-child {
        border-bottom: none;
    }
    
    .demographics-grid {
        grid-template-columns: 1fr;
    }
    
    .data-management {
        grid-template-columns: 1fr;
    }
    
    .nav-item span {
        font-size: 0.6rem;
    }
}

@media (max-width: 480px) {
    .metric-card {
        flex-direction: column;
        text-align: center;
    }
    
    .metric-icon {
        margin-bottom: 0.5rem;
    }
    
    .analytics-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .platform-item {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Loading states and animations */
.sync-btn.syncing {
    background: rgba(255,255,255,0.3);
    cursor: not-allowed;
}

.sync-btn.syncing i {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Notification styles */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    z-index: 9999;
    max-width: 300px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    animation: slideInRight 0.3s ease;
}

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

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

.notification.warning {
    background: var(--warning-color);
    color: #333;
}

.notification.info {
    background: var(--primary-color);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* Improved button states */
.connect-btn.connected {
    background: var(--success-color);
    color: white;
}

.connect-btn.connected:hover {
    background: #45a049;
}

/* Chart container improvements */
.chart-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1rem 0;
    box-shadow: var(--shadow);
    position: relative;
}

#performanceChart {
    width: 100% !important;
    height: 400px !important;
    max-width: 100%;
}

/* Error states */
.error-state {
    background: #ffebee;
    border: 1px solid #f44336;
    border-radius: var(--border-radius);
    padding: 1rem;
    margin: 1rem 0;
    color: #c62828;
}

.warning-state {
    background: #fff3e0;
    border: 1px solid #ff9800;
    border-radius: var(--border-radius);
    padding: 1rem;
    margin: 1rem 0;
    color: #e65100;
}

/* Loading spinner */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

/* Improved form validation */
.form-group.error input,
.form-group.error select {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 2px rgba(244, 67, 54, 0.2);
}

.form-group.error .error-message {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

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

/* Focus states for better accessibility */
button:focus,
input:focus,
select:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --success-color: #008000;
        --danger-color: #ff0000;
        --warning-color: #ffa500;
        --text-color: #000000;
        --background-color: #ffffff;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.hidden { display: none !important; }
.visible { display: block !important; }
.mb-1 { margin-bottom: 1rem; }
.mt-1 { margin-top: 1rem; }
.p-1 { padding: 1rem; }