/* Workout Generator Modern Design System - 2025 */
/* Built for viral potential and modern aesthetics */

:root {
  /* ========================================= */
  /* Primitive Tokens (Base Palette)           */
  /* ========================================= */

  /* Brand Colors */
  --primary-purple: #5D5FEF;
  --primary-dark: #4547CC;
  --primary-light: #7D7FF2;
  --primary-gradient: linear-gradient(135deg, #5D5FEF 0%, #7D7FF2 100%);
  --primary-gradient-vibrant: linear-gradient(135deg, #5D5FEF 0%, #9D5FEF 50%, #5D9FEF 100%);
  
  /* Secondary Colors */
  --accent-pink: #FF6B6B;
  --accent-orange: #FF8E53;
  --accent-gradient: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
  
  /* Functional Colors */
  --success-green: #4ECDC4;
  --success-gradient: linear-gradient(135deg, #4ECDC4 0%, #44E3D3 100%);
  --error-red: #FF6B6B;
  --warning-yellow: #FFD93D;
  
  /* Neutral Palette (Light Mode Defaults) */
  --white: #FFFFFF;
  --off-white: #FAFBFC;
  --gray-50: #F7F8FA;
  --gray-100: #E6E8EB;
  --gray-200: #DFE3E8;
  --gray-300: #C1C8CD;
  --gray-400: #8B95A1;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  --black: #000000;

  /* ========================================= */
  /* Semantic Tokens (Theme Abstraction)       */
  /* ========================================= */

  /* Backgrounds */
  --bg-body: var(--off-white);
  --bg-card: var(--white);
  --bg-surface: var(--gray-50);
  --bg-surface-secondary: var(--gray-100);
  --bg-glass: rgba(255, 255, 255, 0.1);

  /* Text */
  --text-main: var(--gray-900);
  --text-secondary: var(--gray-600);
  --text-muted: var(--gray-400);
  --text-inverse: var(--white);

  /* Borders */
  --border-default: var(--gray-200);
  --border-glass: rgba(255, 255, 255, 0.2);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 40px rgba(93, 95, 239, 0.3);
  --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.15);

  /* Effects */
  --glass-blur: blur(10px);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Poppins', var(--font-sans);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Animations */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ========================================= */
/* Dark Mode Theme Overrides                 */
/* ========================================= */
[data-theme="dark"] {
  /* Re-mapping Semantic Tokens to Dark Primitives */

  /* Backgrounds */
  --bg-body: #0F1419; /* Deep dark blue-grey */
  --bg-card: #1A1F2E; /* Lighter surface */
  --bg-surface: #1E2330;
  --bg-surface-secondary: #252A3A;
  --bg-glass: rgba(0, 0, 0, 0.3);

  /* Text */
  --text-main: #F9FAFB; /* Almost white */
  --text-secondary: #D1D5DB; /* Light gray */
  --text-muted: #9CA3AF; /* Medium gray */
  --text-inverse: #111827; /* Dark for inverse contexts */

  /* Borders */
  --border-default: #2D3748;
  --border-glass: rgba(255, 255, 255, 0.1);

  /* Shadows - Darker and more spread out for depth */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.5);

  /* Adjust specific component colors if needed */
  --primary-purple: #7D7FF2; /* Lighter purple for better contrast on dark */
  --off-white: #0F1419; /* Map legacy usage */
  --white: #1A1F2E; /* Map legacy usage */
  --gray-50: #1E2330; /* Map legacy usage */
  --gray-100: #252A3A;
  --gray-200: #2D3748;
  --gray-900: #F9FAFB;
}

/* Global Reset with Modern Defaults */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: auto; /* Default to auto for iOS compatibility */
}

/* Enable smooth scrolling only for non-touch devices */
@media (hover: hover) and (pointer: fine) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  font-family: var(--font-sans);
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* Typography Classes */
.heading-1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  background: var(--primary-gradient-vibrant);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.heading-2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.heading-3 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-main);
}

.heading-4 {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-main);
}

.body-large {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.body-base {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.body-small {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.caption {
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.025em;
  color: var(--text-muted);
}

/* Modern Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.5;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn:before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:active:before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #FFFFFF; /* Always white text on primary button */
  box-shadow: 0 4px 15px rgba(93, 95, 239, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(93, 95, 239, 0.5);
}

.btn-secondary {
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: var(--bg-surface);
  transform: translateY(-2px);
}

.btn-accent {
  background: var(--accent-gradient);
  color: #FFFFFF;
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.btn-large {
  padding: var(--space-md) var(--space-xl);
  font-size: 1.125rem;
}

.btn-small {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.875rem;
}

/* Glassmorphism Card */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-glass);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

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

/* Neumorphism Elements */
.neo-element {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
}

.neo-element-pressed {
  box-shadow: inset 2px 2px 5px rgba(0,0,0,0.1);
}

/* Gradient Backgrounds */
.gradient-bg-primary {
  background: var(--primary-gradient-vibrant);
}

.gradient-bg-mesh {
  background-color: #5D5FEF;
  background-image: 
    radial-gradient(at 47% 33%, hsl(240, 80%, 70%) 0px, transparent 50%),
    radial-gradient(at 82% 65%, hsl(280, 80%, 70%) 0px, transparent 50%);
}

/* Floating Animation */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.float-animation {
  animation: float 3s ease-in-out infinite;
}

/* Pulse Animation */
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.pulse-animation {
  animation: pulse 2s ease-in-out infinite;
}

/* Glow Effect */
.glow {
  box-shadow: var(--shadow-glow);
}

/* Modern Form Controls */
.form-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--bg-card);
  color: var(--text-main);
  border: 2px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  outline: none;
}

.form-input:focus {
  border-color: var(--primary-purple);
  box-shadow: 0 0 0 3px rgba(93, 95, 239, 0.1);
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Progress Ring */
.progress-ring {
  position: relative;
  width: 120px;
  height: 120px;
}

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

.progress-ring-circle {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset var(--transition-slow);
}

.progress-ring-bg {
  stroke: var(--border-default);
}

.progress-ring-fill {
  stroke: url(#progress-gradient);
}

/* Social Share Button */
.share-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--gradient-bg-primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-full);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
}

.share-button:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

/* Avatar Styles */
.avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 3px solid var(--bg-card);
  box-shadow: var(--shadow-md);
}

.avatar-small {
  width: 32px;
  height: 32px;
}

.avatar-large {
  width: 64px;
  height: 64px;
}

.avatar-group {
  display: flex;
  align-items: center;
}

.avatar-group .avatar:not(:first-child) {
  margin-left: -12px;
}

/* Skeleton Loading */
@keyframes skeleton-loading {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--gray-200) 25%,
    var(--gray-100) 50%,
    var(--gray-200) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

/* Utility Classes */
.text-gradient {
  background: var(--primary-gradient-vibrant);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.backdrop-blur {
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.transition-all {
  transition: all var(--transition-base);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-lift:hover {
  transform: translateY(-4px);
}

/* Responsive Utilities */
@media (max-width: 768px) {
  :root {
    --space-xs: 0.125rem;
    --space-sm: 0.25rem;
    --space-md: 0.75rem;
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 3rem;
  }
  
  .glass-card {
    padding: var(--space-lg);
  }
}

/* Logo Size Fix - Added Jan 2025 */
.logo, .logo-img, img[alt*="logo"], img[alt*="Logo"], img[src*="logo"] {
    max-height: 60px !important;
    width: auto !important;
    object-fit: contain;
}

/* Header Logo Specific */
header .logo, header img {
    max-height: 50px !important;
}

/* Navigation Logo */
nav .logo, nav img {
    max-height: 40px !important;
}