/**
 * FitPeak - Main Stylesheet
 * 
 * A modern, responsive CSS framework for the FitPeak application.
 */

/* ---------- Variables ---------- */
:root {
    /* Colors */
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-primary-light: #93C5FD;
    --color-accent: #F59E0B;
    --color-accent-dark: #D97706;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;
    
    /* Neutral colors */
    --color-white: #FFFFFF;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    --color-black: #000000;
    
    /* Light theme */
    --color-bg: var(--color-white);
    --color-bg-secondary: var(--color-gray-50);
    --color-bg-tertiary: var(--color-gray-100);
    --color-text: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-text-muted: var(--color-gray-500);
    --color-border: var(--color-gray-200);
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-family-mono: 'Roboto Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    
    /* Border radius */
    --border-radius-sm: 0.25rem;    /* 4px */
    --border-radius-md: 0.5rem;     /* 8px */
    --border-radius-lg: 0.75rem;    /* 12px */
    --border-radius-xl: 1rem;       /* 16px */
    --border-radius-pill: 9999px;
    
    /* Container width */
    --container-max-width: 1200px;
    
    /* Spacing */
    --spacing-1: 0.25rem;   /* 4px */
    --spacing-2: 0.5rem;    /* 8px */
    --spacing-3: 0.75rem;   /* 12px */
    --spacing-4: 1rem;      /* 16px */
    --spacing-5: 1.25rem;   /* 20px */
    --spacing-6: 1.5rem;    /* 24px */
    --spacing-8: 2rem;      /* 32px */
    --spacing-10: 2.5rem;   /* 40px */
    --spacing-12: 3rem;     /* 48px */
    --spacing-16: 4rem;     /* 64px */
    --spacing-20: 5rem;     /* 80px */
    --spacing-24: 6rem;     /* 96px */
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
    --shadow-lg: 0 10px 15px -3px var(--color-shadow), 0 4px 6px -2px var(--color-shadow);
    --shadow-xl: 0 20px 25px -5px var(--color-shadow), 0 10px 10px -5px var(--color-shadow);
    
    /* Z-index */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;
    
    /* Transitions */
    --transition-duration: 0.15s;
    --transition-timing: ease-in-out;
  }
  
  /* Dark Theme */
  [data-theme="dark"] {
    --color-primary: #60A5FA;
    --color-primary-dark: #3B82F6;
    --color-primary-light: #93C5FD;
    
    --color-bg: var(--color-gray-900);
    --color-bg-secondary: var(--color-gray-800);
    --color-bg-tertiary: var(--color-gray-700);
    --color-text: var(--color-gray-50);
    --color-text-secondary: var(--color-gray-300);
    --color-text-muted: var(--color-gray-400);
    --color-border: var(--color-gray-700);
    --color-shadow: rgba(0, 0, 0, 0.5);
  }
  
  /* ---------- Reset & Base ---------- */
  *,
  *::before,
  *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html {
    font-size: 16px;
    scroll-behavior: smooth;
  }
  
  body {
    font-family: var(--font-family-sans);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: color 0.3s, background-color 0.3s;
  }
  
  .app-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
  }
  
  .main-content {
    flex: 1;
    padding: var(--spacing-6) 0;
  }
  
  /* Typography */
  h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5em;
    line-height: 1.2;
    font-weight: 600;
    color: var(--color-text);
  }
  
  h1 {
    font-size: 2.25rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  h4 {
    font-size: 1.25rem;
  }
  
  h5 {
    font-size: 1.125rem;
  }
  
  h6 {
    font-size: 1rem;
  }
  
  p {
    margin-bottom: 1rem;
  }
  
  a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-duration) var(--transition-timing);
  }
  
  a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
  }
  
  img {
    max-width: 100%;
    height: auto;
  }
  
  /* Container */
  .container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-4);
  }
  
  /* ---------- Components ---------- */
  
  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.25rem;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-duration) var(--transition-timing);
  }
  
  .btn:hover {
    text-decoration: none;
  }
  
  .btn:focus {
    outline: none;
  }
  
  .btn:disabled,
  .btn.disabled {
    opacity: 0.65;
    pointer-events: none;
  }
  
  .btn svg {
    margin-right: 0.5rem;
  }
  
  .btn-primary {
    color: var(--color-white);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
  }
  
  .btn-primary:hover,
  .btn-primary:focus {
    color: var(--color-white);
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
  }
  
  .btn-outline {
    color: var(--color-primary);
    background-color: transparent;
    border-color: var(--color-primary);
  }
  
  .btn-outline:hover,
  .btn-outline:focus {
    color: var(--color-white);
    background-color: var(--color-primary);
    border-color: var(--color-primary);
  }
  
  .btn-danger {
    color: var(--color-white);
    background-color: var(--color-error);
    border-color: var(--color-error);
  }
  
  .btn-danger:hover,
  .btn-danger:focus {
    background-color: rgba(239, 68, 68, 0.9);
    border-color: rgba(239, 68, 68, 0.9);
  }
  
  .btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
    border-radius: var(--border-radius-lg);
  }
  
  .btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    border-radius: var(--border-radius-sm);
  }
  
  .btn-block {
    display: block;
    width: 100%;
  }
  
  .btn-icon {
    padding: 0.5rem;
    line-height: 1;
  }
  
  /* Forms */
  .form-group {
    margin-bottom: 1.25rem;
  }
  
  .form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
  }
  
  .form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    background-clip: padding-box;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-duration) var(--transition-timing);
  }
  
  .form-control:focus {
    border-color: var(--color-primary);
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(59, 130, 246, 0.25);
  }
  
  .form-text {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
  }
  
  .form-actions {
    margin-top: 1.5rem;
  }
  
  .input-icon-wrapper {
    position: relative;
  }
  
  .input-icon {
    position: absolute;
    top: 50%;
    left: 1rem;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
  }
  
  .input-icon-wrapper .form-control {
    padding-left: 3rem;
  }
  
  .password-toggle {
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
  }
  
  .password-toggle:focus {
    outline: none;
  }
  
  /* Form Checkboxes and Radios */
  .form-checkbox,
  .form-switch {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 2.5rem;
    cursor: pointer;
    user-select: none;
  }
  
  .form-checkbox input,
  .form-switch input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
  }
  
  .checkbox-indicator {
    position: absolute;
    top: 0;
    left: 0;
    height: 1.25rem;
    width: 1.25rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
  }
  
  .form-checkbox:hover input ~ .checkbox-indicator {
    border-color: var(--color-primary);
  }
  
  .form-checkbox input:checked ~ .checkbox-indicator {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
  }
  
  .checkbox-indicator:after {
    content: "";
    position: absolute;
    display: none;
  }
  
  .form-checkbox input:checked ~ .checkbox-indicator:after {
    display: block;
    left: 8px;
    top: 4px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
  }
  
  /* Switch (Toggle) */
  .switch-slider {
    position: absolute;
    top: 0;
    left: 0;
    height: 1.5rem;
    width: 3rem;
    background-color: var(--color-gray-300);
    border-radius: var(--border-radius-pill);
    transition: background-color var(--transition-duration) var(--transition-timing);
  }
  
  .switch-slider:before {
    position: absolute;
    content: "";
    height: 1.25rem;
    width: 1.25rem;
    left: 0.125rem;
    bottom: 0.125rem;
    background-color: var(--color-white);
    border-radius: 50%;
    transition: transform var(--transition-duration) var(--transition-timing);
  }
  
  .form-switch input:checked ~ .switch-slider {
    background-color: var(--color-primary);
  }
  
  .form-switch input:checked ~ .switch-slider:before {
    transform: translateX(1.5rem);
  }
  
  .switch-label {
    font-weight: 500;
  }
  
  /* Cards */
  .card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: var(--color-bg);
    background-clip: border-box;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-6);
    overflow: hidden;
  }
  
  .card-header {
    padding: var(--spacing-4) var(--spacing-6);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
  }
  
  .card-title {
    margin-bottom: 0;
    font-size: 1.25rem;
  }
  
  .card-subtitle {
    margin-top: 0.25rem;
    color: var(--color-text-muted);
  }
  
  .card-body {
    flex: 1 1 auto;
    padding: var(--spacing-6);
  }
  
  .card-footer {
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg);
  }
  
  .mt-4 {
    margin-top: var(--spacing-4);
  }
  
  /* Alerts */
  .alert {
    position: relative;
    padding: var(--spacing-4) var(--spacing-6);
    margin-bottom: var(--spacing-4);
    border: 1px solid transparent;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: flex-start;
  }
  
  .alert-success {
    color: #0D462B;
    background-color: #D1FAE5;
    border-color: #A7F3D0;
  }
  
  .alert-error {
    color: #991B1B;
    background-color: #FEE2E2;
    border-color: #FECACA;
  }
  
  .alert-warning {
    color: #92400E;
    background-color: #FEF3C7;
    border-color: #FDE68A;
  }
  
  .alert-info {
    color: #1E40AF;
    background-color: #DBEAFE;
    border-color: #BFDBFE;
  }
  
  .alert-icon {
    margin-right: var(--spacing-4);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }
  
  .alert-content {
    flex-grow: 1;
  }
  
  .alert-close {
    padding: 0;
    margin-left: var(--spacing-4);
    background: none;
    border: none;
    cursor: pointer;
    color: currentColor;
    opacity: 0.5;
    transition: opacity var(--transition-duration) var(--transition-timing);
  }
  
  .alert-close:hover {
    opacity: 1;
  }
  
  /* Badges */
  .badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--border-radius-sm);
    color: var(--color-white);
    background-color: var(--color-gray-500);
  }
  
  .badge-primary {
    background-color: var(--color-primary);
  }
  
  .badge-success {
    background-color: var(--color-success);
  }
  
  .badge-warning {
    background-color: var(--color-warning);
  }
  
  .badge-error {
    background-color: var(--color-error);
  }
  
  /* Empty state */
  .empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-8);
  }
  
  .empty-state-icon {
    margin-bottom: var(--spacing-4);
    color: var(--color-gray-400);
  }
  
  .empty-state-text {
    font-size: 1rem;
    color: var(--color-text-muted);
    max-width: 400px;
    margin-bottom: var(--spacing-6);
  }
  
  .empty-state-action {
    margin-top: var(--spacing-4);
  }
  
  /* ---------- Layout & Navigation ---------- */
  
  /* Header */
  .main-header {
    background-color: var(--color-bg);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: var(--z-index-sticky);
  }
  
  .header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) 0;
  }
  
  .logo-container {
    display: flex;
    align-items: center;
  }
  
  .logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.5rem;
  }
  
  .logo:hover {
    text-decoration: none;
    color: var(--color-text);
  }
  
  .logo-img {
    height: 2.5rem;
    margin-right: var(--spacing-2);
  }
  
  /* Main Navigation */
  .main-nav {
    display: flex;
    align-items: center;
  }
  
  .nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  
  .nav-item {
    margin: 0 var(--spacing-2);
  }
  
  .nav-item.active .nav-link {
    color: var(--color-primary);
    font-weight: 600;
  }
  
  .nav-link {
    display: block;
    padding: var(--spacing-2) var(--spacing-3);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-duration) var(--transition-timing);
  }
  
  .nav-link:hover {
    color: var(--color-primary);
    text-decoration: none;
  }
  
  /* Mobile Menu Toggle */
  .menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 2rem;
    height: 1.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
  }
  
  .menu-toggle .bar {
    height: 3px;
    width: 100%;
    background-color: var(--color-text);
    border-radius: 10px;
    transition: transform 0.3s, opacity 0.3s;
  }
  
  /* User Actions & Dropdown */
  .user-actions {
    display: flex;
    align-items: center;
  }
  
  .user-dropdown {
    position: relative;
  }
  
  .user-dropdown-toggle {
    display: flex;
    align-items: center;
    padding: var(--spacing-2) var(--spacing-3);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    transition: background-color var(--transition-duration) var(--transition-timing);
    border-radius: var(--border-radius-md);
  }
  
  .user-dropdown-toggle:hover {
    background-color: var(--color-bg-tertiary);
  }
  
  .user-avatar {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    overflow: hidden;
    margin-right: var(--spacing-2);
    border: 2px solid var(--color-border);
  }
  
  .user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  .user-name {
    font-weight: 500;
    margin-right: var(--spacing-2);
  }
  
  .dropdown-arrow {
    transition: transform var(--transition-duration) var(--transition-timing);
  }
  
  .user-dropdown.active .dropdown-arrow {
    transform: rotate(180deg);
  }
  
  .dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    z-index: var(--z-index-dropdown);
    min-width: 10rem;
    padding: var(--spacing-2) 0;
    margin-top: var(--spacing-2);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(-10px);
    visibility: hidden;
    transition: opacity var(--transition-duration) var(--transition-timing),
                transform var(--transition-duration) var(--transition-timing),
                visibility var(--transition-duration) var(--transition-timing);
  }
  
  .user-dropdown.active .dropdown-menu {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
  }
  
  .dropdown-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--color-text);
    text-decoration: none;
    transition: background-color var(--transition-duration) var(--transition-timing);
  }
  
  .dropdown-item:hover {
    background-color: var(--color-bg-tertiary);
    text-decoration: none;
    color: var(--color-text);
  }
  
  .dropdown-item svg {
    margin-right: var(--spacing-3);
  }
  
  /* Footer */
  .main-footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-8) 0;
    margin-top: auto;
  }
  
  .footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: var(--spacing-6);
  }
  
  .footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-4);
  }
  
  .footer-logo-img {
    height: 2rem;
    margin-right: var(--spacing-2);
  }
  
  .footer-logo-text {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
  }
  
  .footer-links {
    display: flex;
    flex-wrap: wrap;
  }
  
  .footer-column {
    margin-right: var(--spacing-10);
    margin-bottom: var(--spacing-6);
  }
  
  .footer-column:last-child {
    margin-right: 0;
  }
  
  .footer-heading {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-4);
  }
  
  .footer-nav {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  
  .footer-nav li {
    margin-bottom: var(--spacing-2);
  }
  
  .footer-nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-duration) var(--transition-timing);
  }
  
  .footer-nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
  }
  
  .footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--color-border);
  }
  
  .copyright {
    color: var(--color-text-muted);
    font-size: 0.875rem;
  }
  
  .social-links {
    display: flex;
  }
  
  .social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    margin-left: var(--spacing-2);
    color: var(--color-text-muted);
    border-radius: 50%;
    transition: all var(--transition-duration) var(--transition-timing);
  }
  
  .social-link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-tertiary);
  }
  
  /* ---------- Page Specific Styles ---------- */
  
  /* Home Page */
  .hero {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    padding: var(--spacing-8) 0;
  }
  
  .hero-content {
    flex: 1;
    min-width: 300px;
    padding-right: var(--spacing-8);
  }
  
  .hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    color: var(--color-text);
  }
  
  .hero-text {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-6);
  }
  
  .hero-actions {
    display: flex;
    gap: var(--spacing-4);
  }
  
  .hero-image {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .hero-svg {
    max-width: 500px;
    height: auto;
  }
  
  .features {
    padding: var(--spacing-16) 0;
    background-color: var(--color-bg-secondary);
  }
  
  .section-title {
    text-align: center;
    margin-bottom: var(--spacing-10);
    font-size: 2rem;
    font-weight: 700;
  }
  
  .feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
  }
  
  .feature-card {
    padding: var(--spacing-6);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
  }
  
  .feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
  }
  
  .feature-icon {
    margin-bottom: var(--spacing-4);
    color: var(--color-primary);
  }
  
  .feature-title {
    margin-bottom: var(--spacing-2);
    font-weight: 600;
  }
  
  .feature-text {
    color: var(--color-text-secondary);
  }
  
  .stats {
    padding: var(--spacing-16) 0;
  }
  
  .stats-content {
    text-align: center;
  }
  
  .stats-text {
    max-width: 600px;
    margin: 0 auto var(--spacing-10);
    color: var(--color-text-secondary);
    font-size: 1.25rem;
  }
  
  .stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
  }
  
  .stat-card {
    padding: var(--spacing-6);
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-2);
  }
  
  .stat-label {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
  }
  
  .cta {
    padding: var(--spacing-16) 0;
    background-color: var(--color-primary);
    color: var(--color-white);
  }
  
  .cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
  }
  
  .cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-4);
    color: var(--color-white);
  }
  
  .cta-text {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-8);
    color: rgba(255, 255, 255, 0.9);
  }
  
  /* Authentication Pages */
  .auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 200px);
    padding: var(--spacing-8) 0;
  }
  
  .auth-card {
    width: 100%;
    max-width: 450px;
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
  }
  
  .auth-header {
    padding: var(--spacing-6);
    text-align: center;
    background-color: var(--color-bg-secondary);
  }
  
  .auth-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .auth-title {
    margin-top: var(--spacing-4);
    font-size: 1.5rem;
    font-weight: 700;
  }
  
  .auth-body {
    padding: var(--spacing-6);
  }
  
  .auth-footer {
    padding: var(--spacing-4) var(--spacing-6);
    text-align: center;
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
  }
  
  .error-list {
    padding-left: var(--spacing-6);
    margin-bottom: 0;
  }
  
  /* Dashboard */
  .page-header {
    margin-bottom: var(--spacing-6);
  }
  
  .page-title {
    font-size: 2rem;
    font-weight: 700;
  }
  
  .dashboard-welcome {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
    padding: var(--spacing-6);
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
  }
  
  .welcome-message h2 {
    margin-bottom: var(--spacing-2);
    font-size: 1.5rem;
  }
  
  .welcome-message p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
  }
  
  .quick-actions {
    display: flex;
    gap: var(--spacing-3);
  }
  
  .dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
  }
  
  .dashboard-main {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-6);
  }
  
  .dashboard-column-wide {
    grid-column: 1;
  }
  
  .activity-chart-container,
  .distribution-chart-container {
    width: 100%;
    height: 250px;
  }
  
  .summary-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
  }
  
  .summary-item {
    padding: var(--spacing-4);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-md);
  }
  
  .summary-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-3);
  }
  
  .summary-title {
    margin-bottom: 0;
    font-size: 1.125rem;
  }
  
  .summary-date {
    font-size: 0.875rem;
    color: var(--color-text-muted);
  }
  
  .summary-stats {
    display: flex;
    justify-content: space-between;
  }
  
  .summary-stat {
    text-align: center;
  }
  
  .summary-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
  }
  
  .summary-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
  }
  
  .activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
  }
  
  .activity-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-3);
    border-radius: var(--border-radius-md);
    background-color: var(--color-bg-tertiary);
  }
  
  .activity-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    margin-right: var(--spacing-3);
    background-color: rgba(75, 192, 192, 0.2);
    color: var(--color-primary);
    border-radius: 50%;
    flex-shrink: 0;
  }
  
  .activity-details {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
  }
  
  .activity-content {
    display: flex;
    align-items: center;
  }
  
  .activity-count {
    font-weight: 600;
    margin-right: var(--spacing-2);
  }
  
  .activity-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
  }
  
  .view-all-link {
    margin-top: var(--spacing-4);
    text-align: center;
  }
  
  /* Exercises Page */
  .exercise-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
  }
  
  .exercise-log-card {
    grid-column: 1;
  }
  
  .quick-add-card,
  .today-exercises-card {
    grid-column: auto;
  }
  
  .quick-add-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-3);
  }
  
  .quick-add-btn {
    font-size: 1.25rem;
    font-weight: 600;
    padding: var(--spacing-4);
  }
  
  .exercise-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
  }
  
  .exercise-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-3);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-md);
  }
  
  .exercise-info {
    flex-grow: 1;
  }
  
  .exercise-name {
    margin-bottom: 0;
    font-size: 1.125rem;
  }
  
  .exercise-count {
    color: var(--color-text-muted);
  }
  
  .exercise-history {
    margin-top: var(--spacing-8);
  }
  
  .history-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    margin-top: var(--spacing-6);
  }
  
  .history-day {
    padding: var(--spacing-4);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-md);
  }
  
  .history-date {
    font-weight: 600;
    margin-bottom: var(--spacing-3);
    display: flex;
    align-items: center;
  }
  
  .history-date .badge {
    margin-left: var(--spacing-2);
  }
  
  .history-exercises {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
  }
  
  .history-exercise {
    display: flex;
    align-items: center;
    padding: var(--spacing-2) var(--spacing-3);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-sm);
  }
  
  .history-exercise-name {
    margin-right: var(--spacing-2);
    font-weight: 500;
  }
  
  .history-exercise-count {
    color: var(--color-primary);
    font-weight: 600;
  }
  
  .view-more-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-6);
  }
  
  /* Leaderboard */
  .leaderboard-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
  }
  
  .filter-group {
    display: flex;
    align-items: center;
  }
  
  .filter-label {
    margin-right: var(--spacing-3);
    font-weight: 500;
  }
  
  .filter-select {
    min-width: 150px;
  }
  
  .leaderboard-summary {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-6);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-6);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
  }
  
  .summary-title {
    margin-bottom: 0;
    font-size: 1.5rem;
  }
  
  .user-rank-card {
    background-color: var(--color-bg);
    padding: var(--spacing-4);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
  }
  
  .user-rank-info {
    display: flex;
    gap: var(--spacing-6);
  }
  
  .user-rank-position,
  .user-rank-total {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .rank-number,
  .total-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
  }
  
  .rank-label,
  .total-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
  }
  
  .leaderboard-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
  }
  
  .leaderboard-table thead th {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-4);
    font-weight: 600;
    text-align: left;
    border-bottom: 2px solid var(--color-border);
  }
  
  .leaderboard-table tbody tr {
    background-color: var(--color-bg);
    transition: background-color var(--transition-duration) var(--transition-timing);
  }
  
  .leaderboard-table tbody tr:hover {
    background-color: var(--color-bg-tertiary);
  }
  
  .leaderboard-table tbody tr.current-user {
    background-color: rgba(59, 130, 246, 0.1);
  }
  
  .leaderboard-table tbody td {
    padding: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
  }
  
  .leaderboard-table .top-rank {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    color: var(--color-white);
  }
  
  .leaderboard-table .top-rank.rank-1 {
    background-color: #FFD700; /* Gold */
    color: #6B4C00;
  }
  
  .leaderboard-table .top-rank.rank-2 {
    background-color: #C0C0C0; /* Silver */
    color: #444444;
  }
  
  .leaderboard-table .top-rank.rank-3 {
    background-color: #CD7F32; /* Bronze */
    color: #4A2E10;
  }
  
  .leaderboard-table .user-info {
    display: flex;
    align-items: center;
  }
  
  .leaderboard-table .user-avatar {
    width: 2rem;
    height: 2rem;
    margin-right: var(--spacing-3);
  }
  
  .rank-col {
    width: 80px;
    text-align: center;
  }
  
  .count-col,
  .activity-col {
    width: 150px;
  }
  
  /* Settings */
  .settings-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-6);
  }
  
  .settings-sidebar {
    position: sticky;
    top: calc(var(--spacing-16) + var(--spacing-6));
    height: fit-content;
  }
  
  .settings-nav {
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
  }
  
  .settings-nav-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-4) var(--spacing-6);
    color: var(--color-text);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: background-color var(--transition-duration) var(--transition-timing),
                border-color var(--transition-duration) var(--transition-timing);
  }
  
  .settings-nav-item svg {
    margin-right: var(--spacing-3);
  }
  
  .settings-nav-item:hover {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
    text-decoration: none;
  }
  
  .settings-nav-item.active {
    background-color: var(--color-bg-tertiary);
    border-left-color: var(--color-primary);
    color: var(--color-primary);
    font-weight: 600;
  }
  
  .settings-section {
    display: none;
  }
  
  .settings-section.active {
    display: block;
  }
  
  .settings-section-title {
    margin-bottom: var(--spacing-6);
    font-size: 1.5rem;
    font-weight: 600;
  }
  
  .profile-info {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-6);
  }
  
  .profile-picture-container {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .profile-picture-preview {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid var(--color-border);
    margin-bottom: var(--spacing-4);
  }
  
  .profile-picture-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  
  .profile-picture-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-3);
  }
  
  .profile-details {
    flex: 1;
    min-width: 300px;
  }
  
  .profile-detail-item {
    margin-bottom: var(--spacing-4);
  }
  
  .detail-label {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-1);
  }
  
  .detail-value {
    font-weight: 500;
  }
  
  /* ---------- Responsive Styles ---------- */
  @media (max-width: 992px) {
    .dashboard-main {
      grid-template-columns: 1fr;
    }
    
    .dashboard-column-wide {
      grid-column: 1;
    }
    
    .settings-container {
      grid-template-columns: 1fr;
    }
    
    .settings-sidebar {
      position: static;
      margin-bottom: var(--spacing-6);
    }
    
    .settings-nav {
      display: flex;
      overflow-x: auto;
      white-space: nowrap;
    }
    
    .settings-nav-item {
      border-left: none;
      border-bottom: 3px solid transparent;
    }
    
    .settings-nav-item.active {
      border-left-color: transparent;
      border-bottom-color: var(--color-primary);
    }
  }
  
  @media (max-width: 768px) {
    .header-content {
      flex-wrap: wrap;
    }
    
    .menu-toggle {
      display: flex;
    }
    
    .main-nav {
      order: 3;
      width: 100%;
      margin-top: var(--spacing-4);
    }
    
    .nav-list {
      display: none;
      flex-direction: column;
      width: 100%;
    }
    
    .nav-list.active {
      display: flex;
    }
    
    .nav-item {
      margin: 0;
    }
    
    .hero {
      flex-direction: column;
      text-align: center;
    }
    
    .hero-content {
      padding-right: 0;
      margin-bottom: var(--spacing-8);
    }
    
    .hero-actions {
      justify-content: center;
    }
    
    .main-footer {
      text-align: center;
    }
    
    .footer-content {
      flex-direction: column;
    }
    
    .footer-links {
      justify-content: center;
    }
    
    .footer-bottom {
      flex-direction: column;
      gap: var(--spacing-4);
    }
    
    .leaderboard-summary {
      flex-direction: column;
      gap: var(--spacing-4);
      text-align: center;
    }
    
    .quick-actions {
      flex-direction: column;
      width: 100%;
    }
  }
  
  @media (max-width: 576px) {
    .dashboard-stats {
      grid-template-columns: 1fr;
    }
    
    .hero-title {
      font-size: 2.25rem;
    }
    
    .section-title,
    .cta-title {
      font-size: 1.75rem;
    }
    
    .feature-grid,
    .stats-grid {
      grid-template-columns: 1fr;
    }
    
    .user-dropdown-toggle .user-name {
      display: none;
    }
    
    .leaderboard-table .activity-col {
      display: none;
    }
  }
  
  /* Dark mode media query support */
  @media (prefers-color-scheme: dark) {
    [data-theme="auto"] {
      --color-bg: var(--color-gray-900);
      --color-bg-secondary: var(--color-gray-800);
      --color-bg-tertiary: var(--color-gray-700);
      --color-text: var(--color-gray-50);
      --color-text-secondary: var(--color-gray-300);
      --color-text-muted: var(--color-gray-400);
      --color-border: var(--color-gray-700);
      --color-shadow: rgba(0, 0, 0, 0.5);
    }
  }