/* Reset ve Temel Stiller */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Ana Renkler */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    
    /* Nötr Renkler */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    
    /* Metin Renkleri */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    /* Durum Renkleri */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Gölgeler */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Geçişler */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

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

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--bg-tertiary);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 1000;
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--bg-tertiary);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.sidebar-nav {
    padding: 1.5rem 0;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-left-color: var(--primary-color);
}

.nav-item.active {
    background: var(--bg-hover);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-item i {
    font-size: 1.25rem;
    width: 1.5rem;
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--bg-tertiary);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left h1 {
    font-size: 1.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.notification-bell {
    position: relative;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.notification-bell:hover {
    background: var(--bg-hover);
}

.notification-bell i {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.notification-badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--error);
    color: white;
    font-size: 0.75rem;
    padding: 0.125rem 0.375rem;
    border-radius: 9999px;
    min-width: 1.25rem;
    text-align: center;
}

.user-avatar img {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    object-fit: cover;
}

/* Content */
.content {
    flex: 1;
    padding: 2rem;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    gap: 2rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

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

.stat-icon {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

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

.stat-value {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-change {
    font-size: 0.875rem;
    font-weight: 500;
}

.stat-change.positive {
    color: var(--success);
}

.stat-change.negative {
    color: var(--error);
}

/* Quick Actions */
.quick-actions {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.quick-actions h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.action-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

.action-btn.primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.action-btn.secondary:hover {
    background: var(--bg-hover);
    transform: translateY(-1px);
}

/* Recent Activity */
.recent-activity {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.recent-activity h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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

.activity-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.activity-item:hover {
    background: var(--bg-hover);
}

.activity-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.activity-icon.warning {
    background: var(--warning);
    color: white;
}

.activity-icon.success {
    background: var(--success);
    color: white;
}

.activity-icon.info {
    background: var(--info);
    color: white;
}

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

.activity-content p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.activity-time {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Monitor Section */
.monitor-container {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    align-items: start;
}

.video-container {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1rem;
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
}

#video {
    width: 100%;
    height: 480px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    object-fit: contain;
}

.overlay-canvas {
    position: absolute;
    top: 1rem;
    left: 1rem;
    width: calc(100% - 2rem);
    height: 480px;
    pointer-events: none;
}

.video-controls {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    justify-content: center;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.control-btn.primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

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

.control-btn.secondary:hover:not(:disabled) {
    background: var(--bg-hover);
}

.control-btn.toggle-active {
    background: var(--success) !important;
    color: white !important;
}

.control-btn.toggle-active:hover {
    background: var(--success) !important;
    opacity: 0.9;
}

/* Monitor Sidebar */
.monitor-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 100%;
}

.posture-status, .metrics, .alerts {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.posture-status h3, .metrics h3, .alerts h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.status-indicator.good {
    color: var(--success);
}

.status-indicator.warning {
    color: var(--warning);
}

.status-indicator.error {
    color: var(--error);
}

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

.metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

.metric:last-child {
    border-bottom: none;
}

.metric label {
    color: var(--text-secondary);
    font-weight: 500;
}

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

.alert-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.alert-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--warning);
    font-weight: 500;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.alert-item.warning {
    color: var(--warning);
    border-left-color: var(--warning);
    background: rgba(255, 193, 7, 0.1);
}

.alert-item.error {
    color: var(--error);
    border-left-color: var(--error);
    background: rgba(220, 53, 69, 0.1);
}

.alert-item.success {
    color: var(--success);
    border-left-color: var(--success);
    background: rgba(40, 167, 69, 0.1);
}

.alert-item.info {
    color: var(--info);
    border-left-color: var(--info);
    background: rgba(23, 162, 184, 0.1);
}

.alert-item i {
    font-size: 1rem;
    min-width: 1rem;
}

.alert-item span {
    flex: 1;
    font-weight: 500;
}

/* Exercises Section */
.exercises-container {
    max-width: 1200px;
}

.exercises-header {
    text-align: center;
    margin-bottom: 2rem;
}

.exercises-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.exercises-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.exercises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.exercise-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: var(--transition);
}

.exercise-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.exercise-image {
    width: 100%;
    height: 200px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    overflow: hidden;
    position: relative;
}

.exercise-animation {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.exercise-frame {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.exercise-frame.active {
    opacity: 1;
}

.exercise-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.exercise-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.exercise-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.exercise-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.exercise-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.exercise-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* Analytics Section */
.analytics-container {
    max-width: 1400px;
}

.analytics-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.analytics-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.date-picker {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.date-picker input {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    color: var(--text-primary);
}

.apply-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.apply-btn:hover {
    background: var(--primary-dark);
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
}

.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    height: 350px;
    overflow: hidden;
}

.chart-container h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.chart-container canvas {
    width: 100% !important;
    height: 280px !important;
    max-height: 280px;
}

/* Settings Section */
.settings-container {
    max-width: 1000px;
}

.settings-header {
    margin-bottom: 2rem;
}

.settings-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

.settings-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
}

.settings-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

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

.setting-item label {
    color: var(--text-secondary);
    font-weight: 500;
}

.setting-item input, .setting-item select {
    background: var(--bg-tertiary);
    border: 1px solid var(--bg-hover);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    color: var(--text-primary);
    min-width: 120px;
}

.setting-item input:focus, .setting-item select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

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

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

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

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

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

.modal-body {
    padding: 1.5rem;
}

.exercise-preview {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.exercise-content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.video-timer-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.preview-video {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 3rem;
    position: relative;
    overflow: hidden;
}

.exercise-video-container {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.exercise-video-animation {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.exercise-video-frame {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.exercise-video-frame.active {
    opacity: 1;
}

.exercise-video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    z-index: 10;
}

.exercise-video-overlay.exercise-active {
    background: rgba(0, 0, 0, 0.1);
}

.exercise-timer-small {
    margin-top: 0.5rem;
    background: var(--bg-card);
    border: 2px solid var(--primary-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    text-align: center;
    min-width: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.timer-text-small {
    display: block;
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

#timerValue {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.exercise-info h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.exercise-info p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.exercise-steps h5 {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.exercise-steps ol {
    color: var(--text-secondary);
    padding-left: 1.5rem;
}

.exercise-steps li {
    margin-bottom: 0.5rem;
}

.exercise-details {
    margin-bottom: 1rem;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.detail-item i {
    color: var(--primary-color);
    width: 1rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--bg-tertiary);
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn.primary:hover {
    background: var(--primary-dark);
}

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

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

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

.btn.warning:hover {
    background: #eab308;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
    
    .main-content {
        margin-left: 240px;
    }
    
    .monitor-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .monitor-sidebar {
        order: -1;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: var(--transition);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .exercises-grid {
        grid-template-columns: 1fr;
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .exercise-content-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        padding: 1rem;
    }
    
    .content {
        padding: 1rem;
    }
}

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

.section.active {
    animation: fadeIn 0.3s ease-out;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}