/* CSS Custom Properties */
:root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-glass: rgba(255, 255, 255, 0.05);
    --bg-glass-hover: rgba(255, 255, 255, 0.1);
    
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-tertiary: #808080;
    
    --accent-green: #00ff88;
    --accent-blue: #00d4ff;
    --accent-orange: #ff6b35;
    --accent-purple: #8b5cf6;
    
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-light: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-heavy: 0 16px 64px rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50px;
    
    /* Typography */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    
    /* Animations */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

/* App Container */
.app-container {
    max-width: 414px;
    margin: 0 auto;
    min-height: 100vh;
    background: var(--bg-primary);
    position: relative !important;
    overflow-x: hidden;
}

/* Screen Management */
.screen {
    display: none;
    padding-bottom: 100px;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: block;
}

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

/* Screen Headers */
.screen-header {
    padding: var(--spacing-lg);
    padding-top: 60px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-greeting h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.user-name {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.date-info {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.notification-btn {
    position: relative;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: blur(20px);
}

.notification-btn:hover {
    background: var(--bg-glass-hover);
    transform: scale(1.05);
}

.notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--accent-orange);
    color: white;
    font-size: 10px;
    font-weight: 600;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* Screen Content */
.screen-content {
    padding: var(--spacing-lg);
}

/* Activity Cards */
.activity-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.activity-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.activity-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.activity-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    background: var(--bg-glass-hover);
}

.activity-card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.card-icon {
    width: 20px;
    height: 20px;
    color: var(--accent-green);
}

.card-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.card-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.metric-value {
    display: flex;
    flex-direction: column;
}

.counter {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.metric-unit {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    font-weight: 500;
}

.card-footer {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* Progress Rings */
.progress-ring {
    position: relative;
    width: 60px;
    height: 60px;
}

.ring-svg {
    transform: rotate(-90deg);
}

.ring-background {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 4;
}

.ring-progress {
    fill: none;
    stroke: var(--accent-green);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-dasharray: 157;
    stroke-dashoffset: 157;
    transition: stroke-dashoffset var(--transition-slow);
    filter: drop-shadow(0 0 8px var(--accent-green));
}

.ring-percentage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-primary);
}

/* Steps card specific styling */
.steps-card .ring-progress {
    stroke: var(--accent-green);
    filter: drop-shadow(0 0 8px var(--accent-green));
}

.calories-card .ring-progress {
    stroke: var(--accent-orange);
    filter: drop-shadow(0 0 8px var(--accent-orange));
}

.distance-card .ring-progress {
    stroke: var(--accent-blue);
    filter: drop-shadow(0 0 8px var(--accent-blue));
}

.active-card .ring-progress {
    stroke: var(--accent-purple);
    filter: drop-shadow(0 0 8px var(--accent-purple));
}

/* Quick Actions */
.quick-actions {
    margin-bottom: var(--spacing-xl);
}

.quick-actions h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.action-btn {
    flex: 1;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    color: white;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.action-btn:hover::before {
    left: 100%;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.action-btn:active {
    transform: translateY(0);
}

/* Recent Activity */
.recent-activity h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.activity-item {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
}

.activity-item:hover {
    background: var(--bg-glass-hover);
    transform: translateX(4px);
}

.activity-icon {
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
}

.activity-details {
    flex: 1;
}

.activity-details h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.activity-details p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.activity-time {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* Workout Categories */
.workout-categories {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.category-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.category-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.strength-card .category-gradient {
    background: linear-gradient(135deg, var(--accent-green), transparent);
}

.cardio-card .category-gradient {
    background: linear-gradient(135deg, var(--accent-orange), transparent);
}

.yoga-card .category-gradient {
    background: linear-gradient(135deg, var(--accent-purple), transparent);
}

.hiit-card .category-gradient {
    background: linear-gradient(135deg, var(--accent-blue), transparent);
}

.category-card:hover .category-gradient {
    opacity: 0.1;
}

.category-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--accent-green);
    transition: all var(--transition-fast);
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

.category-card h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.category-card p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Featured Workout */
.featured-workout {
    margin-bottom: var(--spacing-xl);
}

.featured-workout h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.workout-card.featured {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

.workout-image {
    height: 120px;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.workout-duration {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-full);
    padding: var(--spacing-sm) var(--spacing-md);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.workout-info {
    padding: var(--spacing-lg);
    position: relative;
}

.workout-info h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.workout-info p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.workout-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.start-workout-btn {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 50%;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.start-workout-btn:hover {
    transform: scale(1.1);
    background: rgba(0, 0, 0, 0.7);
}

/* Workout List */
.popular-workouts h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.workout-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.workout-item {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
}

.workout-item:hover {
    background: var(--bg-glass-hover);
    transform: translateX(4px);
}

.workout-thumbnail {
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
}

.workout-details {
    flex: 1;
}

.workout-details h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.workout-details p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.workout-meta {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.workout-action {
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 50%;
    color: var(--accent-green);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.workout-action:hover {
    background: var(--accent-green);
    color: var(--bg-primary);
    transform: scale(1.1);
}

/* Progress Screen */
.period-selector {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    padding: var(--spacing-xs);
}

.period-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.period-btn.active {
    background: var(--accent-green);
    color: white;
}

.progress-overview {
    margin-bottom: var(--spacing-xl);
}

.progress-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.progress-card h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.progress-value {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.large-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--accent-green);
}

.progress-unit {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-medium);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.stat-icon {
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--accent-green);
}

.stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.stat-change {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

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

/* Chart */
.chart-container {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.chart-container h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.chart-placeholder {
    height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.chart-bars {
    display: flex;
    align-items: end;
    justify-content: space-between;
    height: 160px;
    gap: var(--spacing-sm);
}

.bar {
    flex: 1;
    background: linear-gradient(180deg, var(--accent-green), var(--accent-blue));
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    animation: barGrow 1s ease-out;
}

@keyframes barGrow {
    from { height: 0; }
    to { height: var(--bar-height, 50%); }
}

.chart-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    padding-top: var(--spacing-sm);
}

/* Achievements */
.achievements h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.achievement-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.achievement-item {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
}

.achievement-item.earned {
    border-color: var(--accent-green);
    background: rgba(0, 255, 136, 0.05);
}

.achievement-item:hover {
    background: var(--bg-glass-hover);
    transform: translateX(4px);
}

.achievement-badge {
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
}

.achievement-item.earned .achievement-badge {
    background: var(--accent-green);
    color: var(--bg-primary);
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from { box-shadow: 0 0 10px var(--accent-green); }
    to { box-shadow: 0 0 20px var(--accent-green); }
}

.achievement-info {
    flex: 1;
}

.achievement-info h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.achievement-info p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.achievement-date {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.achievement-progress {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 80px;
}

.achievement-progress .progress-bar {
    width: 60px;
    height: 4px;
}

.achievement-progress span {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Profile Screen */
.profile-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.profile-avatar {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid var(--accent-green);
}

.edit-avatar-btn {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 28px;
    height: 28px;
    background: var(--accent-green);
    border: none;
    border-radius: 50%;
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.edit-avatar-btn:hover {
    transform: scale(1.1);
}

.profile-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.profile-header p {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.profile-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
}

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

.stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--accent-green);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Profile Menu */
.profile-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.menu-section h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.menu-item {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

.menu-item:hover {
    background: var(--bg-glass-hover);
    transform: translateX(4px);
}

.menu-icon {
    width: 44px;
    height: 44px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
}

.menu-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--font-size-md);
    color: var(--text-primary);
}

.menu-badge {
    background: var(--accent-orange);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    margin-right: var(--spacing-sm);
}

/* Bottom Navigation */
.bottom-nav {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: var(--spacing-md) var(--spacing-lg);
    z-index: 100;
}

.nav-item {
    background: none;
    border: none;
    color: var(--text-tertiary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    min-width: 44px;
}

.nav-item:hover {
    color: var(--text-secondary);
    background: var(--bg-glass-hover);
}

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

.nav-item span {
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.nav-item i {
    width: 20px;
    height: 20px;
}

/* Floating Action Button - Fresh Start */
.fab {
    position: absolute !important;
    bottom: 80px !important;
    right: 16px !important;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    border: none;
    border-radius: 50%;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 8px 32px rgba(0, 255, 136, 0.4);
    transform-origin: center !important;
    transition: transform 0.1s ease-in-out !important;
    z-index: 1000;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.fab:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(0, 255, 136, 0.5);
}

.fab:active {
    transform: scale(0.9) !important;
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Responsive Design */
@media (max-width: 375px) {
    .activity-cards {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .workout-categories {
        grid-template-columns: 1fr;
    }
    
    /* Responsive FAB positioning */
    .fab {
        bottom: 70px !important;
        right: 12px !important;
        width: 52px;
        height: 52px;
    }
}

/* Additional responsive breakpoint for very small screens */
@media (max-width: 320px) {
    .fab {
        bottom: 65px !important;
        right: 10px !important;
        width: 48px;
        height: 48px;
    }
}

/* Ensure app container has shadow on larger screens */
@media (min-width: 415px) {
    .app-container {
        box-shadow: 0 0 40px rgba(0, 0, 0, 0.3);
    }
}





/* Loading States */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-medium);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.modal-content {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 400px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform var(--transition-medium);
}

.modal.show .modal-content {
    transform: scale(1);
}

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

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

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.modal-body {
    padding: var(--spacing-lg);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-md);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    position: relative;
    overflow: hidden;
    font-size: var(--font-size-md);
    min-height: 48px;
    backdrop-filter: blur(10px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-blue) 100%);
    color: white;
    box-shadow: 0 4px 20px rgba(0, 255, 136, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 30px rgba(0, 255, 136, 0.4);
    background: linear-gradient(135deg, #00ff88 0%, #00d4ff 100%);
}

.btn-primary:active {
    transform: translateY(-1px) scale(0.98);
    transition: all 0.1s ease;
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.btn-secondary:hover::before {
    left: 100%;
}

.btn-secondary:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
    color: var(--accent-green);
}

.btn-secondary:active {
    transform: translateY(0) scale(0.98);
    transition: all 0.1s ease;
}

/* Button variants */
.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    min-height: 36px;
    border-radius: var(--radius-md);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: var(--font-size-lg);
    min-height: 56px;
    border-radius: var(--radius-xl);
}

.btn-icon-only {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
    min-height: auto;
}

.btn-icon-only.btn-small {
    width: 36px;
    height: 36px;
}

.btn-icon-only.btn-large {
    width: 56px;
    height: 56px;
}



/* Action buttons enhanced */
.action-btn {
    flex: 1;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    color: white;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    min-height: 56px;
    box-shadow: 0 4px 20px rgba(0, 255, 136, 0.3);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.action-btn:hover::before {
    left: 100%;
}

.action-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 30px rgba(0, 255, 136, 0.4);
    background: linear-gradient(135deg, #00ff88, #00d4ff);
}

.action-btn:active {
    transform: translateY(-1px) scale(0.98);
    transition: all 0.1s ease;
}

/* Button loading state */
.btn-loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: var(--spacing-sm);
}

/* Button focus states for accessibility */
.btn-primary:focus,
.btn-secondary:focus,
.action-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.3);
}

.fab:focus {
    outline: none;
    box-shadow: 0 8px 32px rgba(0, 255, 136, 0.4), 0 0 0 3px rgba(0, 255, 136, 0.3);
}

/* Button disabled state */
.btn-primary:disabled,
.btn-secondary:disabled,
.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn-primary:disabled:hover,
.btn-secondary:disabled:hover,
.action-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Danger button variant */
.btn-primary.danger,
.btn-secondary.danger {
    background: linear-gradient(135deg, #ff4757, #ff3742);
    border-color: #ff4757;
    color: white;
}

.btn-primary.danger:hover,
.btn-secondary.danger:hover {
    background: linear-gradient(135deg, #ff3742, #ff2f3a);
    box-shadow: 0 8px 30px rgba(255, 71, 87, 0.4);
}

/* Fullscreen modal styles */
.fullscreen-modal {
    z-index: 1000;
}

.fullscreen-modal .modal-content {
    max-width: 100vw;
    max-height: 100vh;
    width: 100%;
    height: 100%;
    margin: 0;
    border-radius: 0;
    overflow-y: auto;
}

@media (min-width: 768px) {
    .fullscreen-modal .modal-content {
        max-width: 90vw;
        max-height: 90vh;
        width: auto;
        height: auto;
        margin: 5vh auto;
        border-radius: var(--radius-lg);
    }
}

/* Health Data Screen */
.health-data-screen {
    padding: var(--spacing-lg);
}

.health-metrics {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.metric-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(20px);
}

.metric-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.metric-header i {
    color: var(--accent-green);
    width: 20px;
    height: 20px;
}

.metric-values {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.metric-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.metric-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

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

.bmi-display {
    text-align: center;
}

.bmi-value {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.large-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.bmi-category {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.bmi-category.normal {
    background: rgba(0, 255, 136, 0.2);
    color: var(--accent-green);
}

.bmi-category.underweight {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
}

.bmi-category.overweight {
    background: rgba(255, 152, 0, 0.2);
    color: #ff9800;
}

.bmi-category.obese {
    background: rgba(244, 67, 54, 0.2);
    color: #f44336;
}

.bmi-range {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.metabolism-data {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.health-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.health-action-btn {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    text-align: center;
}

/* Activity History Screen */
.activity-history-screen {
    padding: var(--spacing-lg);
}

.history-filters {
    margin-bottom: var(--spacing-lg);
}

.filter-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
}

.filter-tab {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.filter-tab.active,
.filter-tab:hover {
    background: var(--accent-green);
    color: white;
    border-color: var(--accent-green);
}

.date-range {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.date-input {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.history-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-item {
    text-align: center;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-green);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.history-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.history-item:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
}

.history-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-green);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.history-details {
    flex: 1;
}

.history-details h4 {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-primary);
}

.history-details p {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.history-date {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.history-action {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.history-action:hover {
    background: var(--bg-glass);
    color: var(--accent-green);
}

.empty-history {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
    font-style: italic;
}

/* Friends Screen */
.friends-screen {
    padding: var(--spacing-lg);
}

.friends-header {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .friends-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

.search-bar {
    position: relative;
    flex: 1;
}

.search-bar i {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-input {
    width: 100%;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 40px;
    color: var(--text-primary);
    font-size: var(--font-size-md);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

.friends-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.friends-tab {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.friends-tab.active,
.friends-tab:hover {
    color: var(--accent-green);
    border-bottom-color: var(--accent-green);
}

.friends-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.friend-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
}

.friend-item:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
}

.friend-avatar {
    position: relative;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: var(--bg-tertiary);
}

.friend-avatar.online .status-indicator {
    background: var(--accent-green);
}

.friend-avatar.offline .status-indicator {
    background: var(--text-tertiary);
}

.status-indicator {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
}

.friend-info {
    flex: 1;
}

.friend-info h4 {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-primary);
}

.friend-activity {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.friend-streak {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--accent-orange);
    font-size: var(--font-size-sm);
}

.friend-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Challenges Screen */
.challenges-screen {
    padding: var(--spacing-lg);
}

.challenges-header {
    margin-bottom: var(--spacing-lg);
}

.challenge-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.challenges-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.challenge-tab {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.challenge-tab.active,
.challenge-tab:hover {
    color: var(--accent-green);
    border-bottom-color: var(--accent-green);
}

.challenges-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.challenge-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

.challenge-card:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
}

.challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.challenge-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.challenge-participants {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.challenge-progress {
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    transition: width 0.3s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
}

.time-left {
    color: var(--accent-orange);
    font-weight: 600;
}

.challenge-info {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.challenge-difficulty {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.challenge-difficulty.easy {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
}

.challenge-difficulty.medium {
    background: rgba(255, 193, 7, 0.2);
    color: #ffc107;
}

.challenge-difficulty.hard {
    background: rgba(244, 67, 54, 0.2);
    color: #f44336;
}

.challenge-duration {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.challenge-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.challenge-prize {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent-green);
}

.empty-challenges {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
    font-style: italic;
}

/* Settings Screens */
.settings-screen {
    padding: var(--spacing-lg);
}

.settings-section {
    margin-bottom: var(--spacing-xl);
}

.settings-section h3 {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
}

.setting-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.setting-info {
    flex: 1;
}

.setting-title {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.setting-description {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-tertiary);
    border-radius: 24px;
    transition: all var(--transition-fast);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--accent-green);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.settings-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Help Screen */
.help-screen {
    padding: var(--spacing-lg);
}

.help-search {
    margin-bottom: var(--spacing-lg);
}

.help-categories {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.help-category {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.category-header {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.category-header i {
    color: var(--accent-green);
    width: 20px;
    height: 20px;
}

.category-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.help-items {
    padding: 0;
}

.help-item {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.help-item span {
    color: var(--text-primary);
}

.help-item i {
    color: var(--text-secondary);
}

.help-contact {
    text-align: center;
}

.help-contact h3 {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--text-primary);
}

.contact-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.contact-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    text-align: center;
}

/* Workout Category Screen */
.workout-category-screen {
    padding: var(--spacing-lg);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
    gap: var(--spacing-lg);
}

.category-info h2 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-primary);
}

.category-info p {
    margin: 0;
    color: var(--text-secondary);
}

.category-stats {
    display: flex;
    gap: var(--spacing-md);
}

.category-stats .stat {
    text-align: center;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    min-width: 80px;
}

.workout-filters {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
    padding-bottom: var(--spacing-xs);
}

.filter-btn {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.workouts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.workout-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.workout-card:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.workout-image {
    height: 120px;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.workout-difficulty {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.workout-duration {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.workout-info {
    padding: var(--spacing-lg);
}

.workout-info h3 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-primary);
}

.workout-info p {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

.workout-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.workout-stats .stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.workout-stats .stat i {
    color: var(--accent-green);
    width: 16px;
    height: 16px;
}

.workout-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.workout-actions .btn-small {
    flex: 1;
    justify-content: center;
}

/* Modern Profile Menu Button */
.profile-menu-btn {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
}

.profile-menu-btn:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.profile-menu-btn:active {
    transform: translateY(0);
    transition: all 0.1s ease;
}

/* Hamburger Menu */
.hamburger-menu {
    width: 24px;
    height: 18px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

.hamburger-menu span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

.profile-menu-btn:hover .hamburger-menu span:nth-child(1) {
    transform: translateY(2px) rotate(45deg);
    background: var(--accent-green);
}

.profile-menu-btn:hover .hamburger-menu span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.profile-menu-btn:hover .hamburger-menu span:nth-child(3) {
    transform: translateY(-2px) rotate(-45deg);
    background: var(--accent-green);
}

/* Profile Avatar Alternative */
.profile-avatar-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.profile-avatar-btn:hover {
    transform: scale(1.05);
    border-color: var(--accent-green);
    box-shadow: 0 8px 25px rgba(0, 255, 136, 0.3);
}

.avatar-text {
    color: white;
    font-weight: 700;
    font-size: 14px;
}

.online-indicator {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 10px;
    height: 10px;
    background: var(--accent-green);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(0, 255, 136, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

/* Walking Timer Modal */
.walk-timer-modal {
    z-index: 1001;
}

.walk-timer-content {
    text-align: center;
    padding: var(--spacing-xl);
    max-width: 400px;
    margin: 0 auto;
}

.walk-timer-display {
    margin: var(--spacing-xl) 0;
}

.timer-circle {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-lg);
    position: relative;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--border-color);
}

.timer-progress {
    position: absolute;
    top: -4px;
    left: -4px;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 4px solid transparent;
    border-top-color: var(--accent-green);
    animation: spin 2s linear infinite;
}

.timer-text {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    z-index: 1;
}

.walk-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.walk-stat {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
}

.walk-stat-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-green);
    margin-bottom: var(--spacing-xs);
}

.walk-stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.walk-controls {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.walk-control-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.5rem;
}

.walk-control-btn.play {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    color: white;
    box-shadow: 0 4px 20px rgba(0, 255, 136, 0.3);
}

.walk-control-btn.pause {
    background: var(--bg-glass);
    color: var(--accent-orange);
    border: 2px solid var(--accent-orange);
}

.walk-control-btn.stop {
    background: var(--bg-glass);
    color: #ff4757;
    border: 2px solid #ff4757;
}

.walk-control-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.walk-control-btn:active {
    transform: scale(0.95);
}

/* Health Profile Form */
.health-profile-form {
    padding: var(--spacing-lg);
    max-width: 500px;
    margin: 0 auto;
}

.form-section {
    margin-bottom: var(--spacing-xl);
}

.form-section h3 {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-section h3 i {
    color: var(--accent-green);
    width: 20px;
    height: 20px;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.form-input {
    width: 100%;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-md);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
    background: var(--bg-glass-hover);
}

.form-input.error {
    border-color: #ff4757;
    box-shadow: 0 0 0 3px rgba(255, 71, 87, 0.1);
}

.field-error {
    color: #ff4757;
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.field-error::before {
    content: "⚠";
    font-size: 12px;
}

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

@media (max-width: 768px) {
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .btn-primary,
    .form-actions .btn-secondary {
        width: 100%;
        justify-content: center;
    }
}

.form-select {
    width: 100%;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-select:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.bmi-display {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.bmi-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.bmi-category {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.bmi-description {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* GPS Simulation */
.gps-section {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.gps-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.gps-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.gps-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
    animation: pulse 2s infinite;
}

.gps-indicator.searching {
    background: var(--accent-orange);
}

.gps-indicator.disabled {
    background: var(--text-tertiary);
    animation: none;
}

.distance-input-group {
    margin-top: var(--spacing-md);
}

.input-with-unit {
    position: relative;
}

.input-unit {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    pointer-events: none;
}

/* Loading States */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.loading-screen.show {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--accent-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-text {
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.loading-subtext {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Fast Screen Transitions */
.screen {
    opacity: 0;
    transition: opacity 0.2s ease-out;
    will-change: opacity;
}

.screen.active {
    opacity: 1;
}

/* Back Button */
.back-button {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-primary);
    margin-right: var(--spacing-md);
}

.back-button:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
    transform: translateX(-2px);
    color: var(--accent-green);
}

.back-button:active {
    transform: translateX(0) scale(0.95);
}

/* Fast Modal Transitions */
.modal {
    opacity: 0;
    visibility: hidden;
    transform: scale(0.95);
    transition: all 0.2s ease-out;
    will-change: transform, opacity;
}

.modal.show {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

/* Interactive Card Enhancements */
.activity-card,
.stat-card,
.achievement-card,
.streak-card {
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.activity-card::before,
.stat-card::before,
.achievement-card::before,
.streak-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.activity-card:hover::before,
.stat-card:hover::before,
.achievement-card:hover::before,
.streak-card:hover::before {
    left: 100%;
}

.activity-card:hover,
.stat-card:hover,
.achievement-card:hover,
.streak-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    border-color: var(--accent-green);
}

.activity-card:active,
.stat-card:active,
.achievement-card:active,
.streak-card:active {
    transform: translateY(-2px) scale(0.98);
    transition: all 0.1s ease;
}

/* Menu Item Enhancements */
.menu-item {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.menu-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 255, 136, 0.1), transparent);
    transition: left 0.5s ease;
}

.menu-item:hover::before {
    left: 100%;
}

.menu-item:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
    transform: translateX(5px);
}

.menu-item:hover .menu-icon {
    color: var(--accent-green);
    transform: scale(1.1);
}

.menu-item:hover .menu-content span {
    color: var(--accent-green);
}

.menu-item:active {
    transform: translateX(2px) scale(0.98);
    transition: all 0.1s ease;
}

/* Button Press Effects */
.btn-primary:active,
.btn-secondary:active,
.action-btn:active {
    transform: translateY(-1px) scale(0.95);
    transition: all 0.1s ease;
}

/* Ripple Effect Enhancement */
.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(0, 255, 136, 0.3);
    transform: scale(0);
    animation: ripple-animation 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Progress Indicators */
.progress-indicator {
    position: relative;
    overflow: hidden;
}

.progress-indicator::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
    animation: progress-sweep 2s infinite;
}

@keyframes progress-sweep {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Notification Enhancements */
.notification {
    transform: translateX(400px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left: 4px solid var(--accent-green);
    background: rgba(0, 255, 136, 0.1);
}

.notification.error {
    border-left: 4px solid #ff4757;
    background: rgba(255, 71, 87, 0.1);
}

.notification.warning {
    border-left: 4px solid var(--accent-orange);
    background: rgba(255, 159, 67, 0.1);
}

/* Confirmation modal */
.confirmation-content {
    text-align: center;
    padding: var(--spacing-lg);
}

.warning-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    background: rgba(255, 193, 7, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffc107;
}

.warning-icon i {
    width: 30px;
    height: 30px;
}

.confirmation-content h3 {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-primary);
}

.confirmation-content p {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--text-secondary);
    line-height: 1.5;
}

.confirmation-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* Onboarding Styles */
.onboarding-modal .modal-content {
    max-width: 500px;
}

.onboarding-step {
    display: none;
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.onboarding-step.active {
    display: block;
}

.step-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: white;
}

.step-icon i {
    width: 32px;
    height: 32px;
}

.onboarding-step h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.onboarding-step p {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
}

.feature i {
    width: 20px;
    height: 20px;
    color: var(--accent-green);
}

.onboarding-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-lg);
}

.onboarding-actions {
    text-align: center;
    padding-top: var(--spacing-lg);
}

/* Achievement Notification */
.achievement-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--accent-green);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    max-width: 300px;
    z-index: 1001;
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--transition-medium);
}

.achievement-notification.show {
    transform: translateX(0);
    opacity: 1;
}

.achievement-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.achievement-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-green);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    animation: pulse 2s infinite;
}

.achievement-text h4 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.achievement-text p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-weight: 500;
    z-index: 1000;
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
    transition: all var(--transition-medium);
}

.notification.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.notification-success {
    border-color: var(--accent-green);
    background: rgba(0, 255, 136, 0.1);
}

.notification-error {
    border-color: var(--accent-orange);
    background: rgba(255, 107, 53, 0.1);
}

.notification-info {
    border-color: var(--accent-blue);
    background: rgba(0, 212, 255, 0.1);
}

/* Error Message */
.error-message {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-orange);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    z-index: 1001;
}

/* Quick Actions Grid */
.quick-actions-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.quick-action-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.quick-action-card:hover {
    background: var(--bg-glass-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.quick-action-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.quick-action-card h3 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.quick-action-card p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
}

/* Activity Detail Modal */
.activity-detail-content {
    text-align: center;
}

.detail-stats {
    margin-bottom: var(--spacing-xl);
}

.detail-current {
    margin-bottom: var(--spacing-lg);
}

.detail-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--accent-green);
    line-height: 1;
}

.detail-unit {
    font-size: var(--font-size-md);
    color: var(--text-secondary);
    text-transform: lowercase;
}

.detail-progress {
    margin: var(--spacing-xl) 0;
}

.circular-progress {
    position: relative;
    display: inline-block;
}

.progress-ring {
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 8;
}

.ring-fill {
    fill: none;
    stroke: var(--accent-green);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s ease;
    filter: drop-shadow(0 0 8px var(--accent-green));
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.progress-percentage {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.progress-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.detail-goal {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-md);
}

.goal-label {
    color: var(--text-secondary);
}

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

.detail-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.detail-actions .btn-secondary,
.detail-actions .btn-primary {
    flex: 1;
}

/* Recent Logs */
.recent-logs h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.logs-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 200px;
    overflow-y: auto;
}

.log-entry {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.log-entry:hover {
    background: var(--bg-glass-hover);
}

.log-date {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

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

.log-delete-btn {
    background: none;
    border: none;
    color: var(--accent-orange);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.log-delete-btn:hover {
    background: rgba(255, 107, 53, 0.1);
    transform: scale(1.1);
}

.no-logs {
    text-align: center;
    color: var(--text-tertiary);
    font-style: italic;
    padding: var(--spacing-lg);
}

/* Goal Edit Modal */
.goal-edit-form .form-group {
    position: relative;
}

.input-unit {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    pointer-events: none;
}

.goal-suggestions {
    margin: var(--spacing-lg) 0;
}

.goal-suggestions h4 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.suggestion-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.suggestion-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.suggestion-btn:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-green);
}

.suggestion-btn.active {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
}

/* Loading States */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: var(--radius-lg);
}

.loading-spinner {
    text-align: center;
    color: var(--text-primary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--accent-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
}

/* Enhanced Activity Cards */
.activity-card {
    cursor: pointer;
    user-select: none;
}

.activity-card:active {
    transform: scale(0.98);
}

/* Enhanced Chart Labels */
.chart-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    padding-top: var(--spacing-sm);
    transition: all var(--transition-fast);
}

/* Level Up Notification */
.level-up-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    border: 1px solid var(--accent-purple);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    max-width: 300px;
    z-index: 1001;
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--transition-medium);
}

.level-up-notification.show {
    transform: translateX(0);
    opacity: 1;
}

.level-up-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.level-up-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    animation: levelPulse 2s infinite;
}

@keyframes levelPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.level-up-text h4 {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-xs);
}

.level-up-text h5 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-xs);
}

.level-up-text p {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.9);
}

/* Achievement Points */
.achievement-points {
    font-size: var(--font-size-xs);
    color: var(--accent-green);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 4px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--accent-green);
    border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-blue);
}

/* Focus States for Accessibility */
button:focus,
.nav-item:focus,
.menu-item:focus {
    outline: 2px solid var(--accent-green);
    outline-offset: 2px;
}

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