/* Root Variables for Theming */
:root {
    /* Light Theme Colors */
    --light-bg: #f5f7fa;
    --light-surface: #ffffff;
    --light-surface-variant: #f0f2f5;
    --light-text: #333333;
    --light-text-secondary: #666666;
    --light-border: #e0e0e0;
    --light-shadow: rgba(0, 0, 0, 0.1);

    /* Dark Theme Colors */
    --dark-bg: #121212;
    --dark-surface: #1e1e1e;
    --dark-surface-variant: #2d2d2d;
    --dark-text: #f5f5f5;
    --dark-text-secondary: #b0b0b0;
    --dark-border: #3d3d3d;
    --dark-shadow: rgba(0, 0, 0, 0.3);

    /* Accent Colors */
    --accent-blue: #4361ee;
    --accent-blue-light: rgba(67, 97, 238, 0.15);
    --accent-teal: #0cca98;
    --accent-teal-light: rgba(12, 202, 152, 0.15);
    --accent-purple: #7209b7;
    --accent-purple-light: rgba(114, 9, 183, 0.15);
    --accent-pink: #f72585;
    --accent-pink-light: rgba(247, 37, 133, 0.15);
    --accent-orange: #fb8500;
    --accent-orange-light: rgba(251, 133, 0, 0.15);

    /* Current Theme & Accent (will be updated via JS) */
    --accent: var(--accent-blue);
    --accent-light: var(--accent-blue-light);

    /* Common Colors */
    --success: #2cb67d;
    --warning: #ffc107;
    --error: #ef476f;
    --info: #4cc9f0;

    /* Progress Colors */
    --protein-color: #ef476f;
    --carbs-color: #ffd166;
    --fats-color: #06d6a0;
    --calories-color: #118ab2;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Other */
    --sidebar-width: 250px;
    --header-height: 60px;
    --transition: all 0.3s ease;
}

/* Apply theme specific variables */
.light-theme {
    --bg: var(--light-bg);
    --surface: var(--light-surface);
    --surface-variant: var(--light-surface-variant);
    --text: var(--light-text);
    --text-secondary: var(--light-text-secondary);
    --border: var(--light-border);
    --shadow: var(--light-shadow);
}

.dark-theme {
    --bg: var(--dark-bg);
    --surface: var(--dark-surface);
    --surface-variant: var(--dark-surface-variant);
    --text: var(--dark-text);
    --text-secondary: var(--dark-text-secondary);
    --border: var(--dark-border);
    --shadow: var(--dark-shadow);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background-color: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.5;
    transition: var(--transition);
}

a {
    color: var(--accent);
    text-decoration: none;
}

img {
    max-width: 100%;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

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

/* Sidebar Navigation */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 100;
}

.brand {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.brand i {
    color: var(--accent);
    font-size: 24px;
    margin-right: var(--spacing-sm);
}

.brand h1 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.nav-links {
    list-style: none;
    padding: var(--spacing-md) 0;
    flex-grow: 1;
    overflow-y: auto;
}

.nav-links li {
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
}

.nav-links li:hover {
    background-color: var(--surface-variant);
    color: var(--text);
}

.nav-links li.active {
    background-color: var(--accent-light);
    color: var(--accent);
    border-left: 3px solid var(--accent);
}

.nav-links li i {
    font-size: 18px;
    margin-right: var(--spacing-md);
    width: 24px;
    text-align: center;
}

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

.theme-toggle i {
    font-size: 18px;
    color: var(--text-secondary);
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 24px;
}

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

.toggle-switch label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--surface-variant);
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.toggle-switch label::before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background-color: var(--surface);
    border-radius: 50%;
    transition: var(--transition);
}

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

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

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--surface);
    padding: 0 var(--spacing-md);
    z-index: 99;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
}

.menu-toggle, .mobile-actions {
    font-size: 24px;
    color: var(--text);
    cursor: pointer;
}

.mobile-header .brand {
    border: none;
    padding: 0;
}

.mobile-header .brand i {
    font-size: 20px;
}

.mobile-header .brand h1 {
    font-size: 1.1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--spacing-xl);
    transition: var(--transition);
}

.page {
    display: none;
}

.page.active {
    display: block;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.page-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
}

.date-picker {
    display: flex;
    align-items: center;
    font-size: 1rem;
    color: var(--text-secondary);
    background-color: var(--surface);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.date-picker i {
    margin-right: var(--spacing-sm);
    color: var(--accent);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--shadow);
}

.stat-icon {
    width: 50px;
    height: 50px;
    background-color: var(--accent-light);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-md);
    color: var(--accent);
    font-size: 20px;
}

.stat-content h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-content p {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.stat-content span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Section Titles */
.section-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: var(--spacing-xl) 0 var(--spacing-md);
}

.section-title h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

/* Activity Cards */
.activities-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.activity-card {
    background-color: var(--surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border-left: 4px solid var(--accent);
    box-shadow: 0 2px 8px var(--shadow);
}

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

.activity-title {
    font-weight: 600;
}

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

.activity-meta {
    display: flex;
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.activity-meta div {
    margin-right: var(--spacing-md);
    display: flex;
    align-items: center;
}

.activity-meta i {
    margin-right: var(--spacing-xs);
    color: var(--accent);
}

/* Empty States */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    border: 1px dashed var(--border);
}

.empty-state img {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

/* Chart Container */
.chart-container {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
    margin-bottom: var(--spacing-xl);
    height: 300px;
}

/* Workouts Page */
.workout-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    min-width: 180px;
}

.filter-group label {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

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

.workout-card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 2px 8px var(--shadow);
    transition: var(--transition);
}

.workout-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--shadow);
}

.workout-category {
    height: 6px;
    background-color: var(--accent);
}

.workout-card.strength .workout-category {
    background-color: var(--protein-color);
}

.workout-card.cardio .workout-category {
    background-color: var(--calories-color);
}

.workout-card.yoga .workout-category {
    background-color: var(--success);
}

.workout-card.hiit .workout-category {
    background-color: var(--warning);
}

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

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

.workout-title {
    font-size: 1.1rem;
    font-weight: 600;
}

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

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

.workout-stat {
    flex: 1;
    text-align: center;
    padding: var(--spacing-sm);
    border-right: 1px solid var(--border);
}

.workout-stat:last-child {
    border-right: none;
}

.workout-stat span {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.workout-stat strong {
    font-size: 1.1rem;
}

.workout-notes {
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Nutrition Page */
.nutrition-summary {
    margin-bottom: var(--spacing-xl);
}

.macros-card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.macros-card h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

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

.macro {
    width: 100%;
}

.macro-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.progress-bar {
    height: 8px;
    background-color: var(--surface-variant);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

#protein-progress {
    background-color: var(--protein-color);
}

#carbs-progress {
    background-color: var(--carbs-color);
}

#fats-progress {
    background-color: var(--fats-color);
}

#calories-progress {
    background-color: var(--calories-color);
}

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

.meal-card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

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

.meal-type {
    font-size: 0.85rem;
    color: var(--accent);
    background-color: var(--accent-light);
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.meal-content h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.meal-macros {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.meal-macro {
    text-align: center;
}

.meal-macro span {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.meal-macro strong {
    font-size: 1rem;
}

/* Progress Page */
.metrics-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.metric-card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.metric-card h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.weight-input {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.weight-input label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.weight-form {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.weight-form input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.2rem;
    height: 50px;
    min-width: 150px; /* Ensure minimum width */
    width: 100%; /* Take available space */
    max-width: 250px; /* Set maximum width */
}

.weight-form select {
    height: 50px;
    min-width: 70px;
    font-size: 1.1rem;
}

.weight-form button {
    height: 50px;
    padding: 0 var(--spacing-lg);
    font-size: 1.1rem;
}

.measurements-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.measurement {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border);
}

.measurement span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.measurement-value {
    font-weight: 600;
    margin: 0 var(--spacing-sm);
}

.btn-icon {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 1rem;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.achievement {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    box-shadow: 0 2px 8px var(--shadow);
}

.achievement.locked {
    opacity: 0.6;
}

.achievement-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background-color: var(--accent-light);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-right: var(--spacing-md);
}

.achievement-content h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.achievement-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Settings Page */
.settings-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.settings-card {
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.settings-card h3 {
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
}

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

.form-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 200px;
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

input, select, textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background-color: var(--surface-variant);
    color: var(--text);
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.input-with-unit {
    display: flex;
    align-items: center;
}

.input-with-unit input {
    flex: 1;
    border-right: none;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-with-unit select, .input-with-unit span {
    width: auto;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    background-color: var(--surface);
    min-width: 60px;
    text-align: center;
}

.input-with-unit span {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-left: none;
    color: var(--text-secondary);
}

/* Theme Settings */
.theme-settings, .color-settings {
    margin-bottom: var(--spacing-lg);
}

.theme-settings h4, .color-settings h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.theme-options {
    display: flex;
    gap: var(--spacing-md);
}

.theme-option {
    text-align: center;
    cursor: pointer;
    opacity: 0.7;
    transition: var(--transition);
}

.theme-option.active {
    opacity: 1;
}

.theme-preview {
    width: 100px;
    height: 60px;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    border: 2px solid transparent;
    transition: var(--transition);
}

.theme-option.active .theme-preview {
    border-color: var(--accent);
}

.light-preview {
    background-color: #f5f7fa;
    position: relative;
}

.light-preview::after {
    content: "";
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    height: 10px;
    background-color: #ffffff;
    border-radius: 5px;
}

.dark-preview {
    background-color: #121212;
    position: relative;
}

.dark-preview::after {
    content: "";
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    height: 10px;
    background-color: #1e1e1e;
    border-radius: 5px;
}

.system-preview {
    background: linear-gradient(to right, #f5f7fa 50%, #121212 50%);
    position: relative;
}

.system-preview::after {
    content: "";
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    height: 10px;
    background: linear-gradient(to right, #ffffff 50%, #1e1e1e 50%);
    border-radius: 5px;
}

.color-options {
    display: flex;
    gap: var(--spacing-md);
}

.color-option {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.color-option.active {
    border-color: var(--text);
}

/* App Settings */
.switch-settings {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.switch-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border);
}

.switch-label span {
    display: block;
    margin-bottom: var(--spacing-xs);
}

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

.unit-toggle {
    display: flex;
    overflow: hidden;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.unit-btn {
    border: none;
    background-color: var(--surface-variant);
    padding: var(--spacing-xs) var(--spacing-md);
    cursor: pointer;
    flex: 1;
    transition: var(--transition);
    color: var(--text-secondary);
}

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

/* Data Management */
.data-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-danger {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    border: none;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background-color: var(--accent);
    opacity: 0.9;
}

.btn-secondary {
    background-color: var(--surface-variant);
    color: var(--text);
}

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

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

.btn-danger:hover {
    background-color: var(--error);
    opacity: 0.9;
}

.btn-primary i, .btn-secondary i, .btn-danger i {
    margin-right: var(--spacing-xs);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    z-index: 1000;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 1001;
    display: none;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

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

.modal-header h3 {
    font-size: 1.25rem;
    margin: 0;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--error);
}

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

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

/* Responsive Design */
@media screen and (max-width: 991px) {
    .metrics-cards {
        grid-template-columns: 1fr;
    }
}

@media screen and (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 1000;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .mobile-header {
        display: flex;
    }
    
    .main-content {
        margin-left: 0;
        padding-top: calc(var(--header-height) + var(--spacing-md));
    }
    
    .stats-grid, .activities-container, .workouts-container, .meals-container {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .workout-filters {
        flex-direction: column;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .form-row .form-group {
        min-width: auto;
    }
    
    .data-actions {
        flex-direction: column;
    }
}

/* Hide increment/decrement arrows on number inputs */
/* Chrome, Safari, Edge, Opera */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Firefox */
input[type="number"] {
    -moz-appearance: textfield;
    appearance: textfield;
}

/* Utility Classes */
.text-success {
    color: var(--success);
}

.text-warning {
    color: var(--warning);
}

.text-error {
    color: var(--error);
}

.text-info {
    color: var(--info);
}

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

.mt-1 {
    margin-top: var(--spacing-md);
}

.mb-1 {
    margin-bottom: var(--spacing-md);
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
}

.badge-primary {
    background-color: var(--accent-light);
    color: var(--accent);
}

.badge-success {
    background-color: rgba(44, 182, 125, 0.15);
    color: var(--success);
}

.badge-warning {
    background-color: rgba(255, 193, 7, 0.15);
    color: var(--warning);
}

.badge-error {
    background-color: rgba(239, 71, 111, 0.15);
    color: var(--error);
}