/* Apple-Inspired Design System */
/* CSS Custom Properties for Light/Dark Mode */

:root {
  /* Typography */
  --font-family-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  
  /* Spacing Scale (Apple's 8px grid) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Typography Scale */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 30px;
  --text-4xl: 36px;
  --text-5xl: 48px;
  --text-6xl: 60px;
  
  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* Line Heights */
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 250ms ease-out;
  --transition-slow: 350ms ease-out;
}

/* Light Mode Colors (Default) */
:root {
  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f5f5f7;
  --color-bg-tertiary: #fafafa;
  
  /* Text Colors */
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #86868b;
  --color-text-tertiary: #a1a1a6;
  
  /* Border Colors */
  --color-border-primary: #d2d2d7;
  --color-border-secondary: #e5e5e7;
  
  /* Accent Colors */
  --color-accent-primary: #007aff;
  --color-accent-hover: #0056cc;
  --color-accent-light: #e3f2fd;
  
  /* Success/Error Colors */
  --color-success: #34c759;
  --color-warning: #ff9500;
  --color-error: #ff3b30;
  
  /* Card Colors */
  --color-card-bg: #ffffff;
  --color-card-border: #e5e5e7;
  --color-card-shadow: rgba(0, 0, 0, 0.1);
  
  /* Form Colors */
  --color-input-bg: #ffffff;
  --color-input-border: #d2d2d7;
  --color-input-focus: #007aff;
  --color-input-placeholder: #86868b;
}

/* Dark Mode Colors */
[data-theme="dark"] {
  /* Background Colors */
  --color-bg-primary: #000000;
  --color-bg-secondary: #1c1c1e;
  --color-bg-tertiary: #2c2c2e;
  
  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #aeaeb2;
  --color-text-tertiary: #8e8e93;
  
  /* Border Colors */
  --color-border-primary: #48484a;
  --color-border-secondary: #3a3a3c;
  
  /* Accent Colors */
  --color-accent-primary: #0a84ff;
  --color-accent-hover: #409cff;
  --color-accent-light: rgba(10, 132, 255, 0.15);
  
  /* Success/Error Colors */
  --color-success: #30d158;
  --color-warning: #ff9f0a;
  --color-error: #ff453a;
  
  /* Card Colors */
  --color-card-bg: #1c1c1e;
  --color-card-border: #48484a;
  --color-card-shadow: rgba(0, 0, 0, 0.3);
  
  /* Form Colors */
  --color-input-bg: #1c1c1e;
  --color-input-border: #48484a;
  --color-input-focus: #0a84ff;
  --color-input-placeholder: #8e8e93;
  
  /* Dark mode shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}

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

html {
  font-family: var(--font-family-system);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  line-height: var(--leading-normal);
}

/* Container System */
.container {
  width: 100%;
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.container-sm { max-width: 640px; }
.container-md { max-width: 768px; }
.container-lg { max-width: 1024px; }
.container-xl { max-width: 1280px; }
.container-2xl { max-width: 1536px; }

/* Apple-style wider containers */
.container-apple { max-width: 1200px; }

/* Grid System */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

/* Spacing Utilities */
.space-section {
  margin-bottom: var(--space-2xl);
}

/* Typography */
.text-display {
  font-size: var(--text-6xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  letter-spacing: -0.025em;
}

.text-headline {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

.text-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
}

.text-body {
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
}

.text-caption {
  font-size: var(--text-sm);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
}

/* Card System */
.card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.card-padding {
  padding: var(--space-xl);
}

.card-padding-sm {
  padding: var(--space-lg);
}

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
}

.btn:focus {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

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

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

.btn-secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-primary);
}

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

.btn-large {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  width: 100%;
}

/* Form Elements */
.form-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-md);
  background-color: var(--color-input-bg);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  font-family: var(--font-family-system);
  transition: all var(--transition-fast);
}

/* Range slider specific styling */
.form-input[type="range"] {
  padding: 0;
  height: 6px;
  background: var(--color-input-border);
  border: none;
  border-radius: var(--radius-sm);
  appearance: none;
  cursor: pointer;
}

.form-input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.form-input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-input-focus);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.form-input::placeholder {
  color: var(--color-input-placeholder);
}

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

/* Form Input Containers */
.checkbox-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.radio-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.form-checkbox {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-input-border);
  background-color: var(--color-input-bg);
  color: var(--color-accent-primary);
  cursor: pointer;
}

.form-radio {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  border: 1px solid var(--color-input-border);
  background-color: var(--color-input-bg);
  color: var(--color-accent-primary);
  cursor: pointer;
}

/* Spacing Utilities */
.space-y-sm > * + * { margin-top: var(--space-sm); }
.space-y-md > * + * { margin-top: var(--space-md); }
.space-y-lg > * + * { margin-top: var(--space-lg); }
.space-y-xl > * + * { margin-top: var(--space-xl); }
.space-y-2xl > * + * { margin-top: var(--space-2xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

/* Custom spacing variants */
.mb-2x { margin-bottom: var(--space-lg); }
.mt-2x { margin-top: var(--space-lg); }
.space-y-1x > * + * { margin-top: var(--space-md); }

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Responsive Grid */
@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
  background-color: var(--color-bg-secondary);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle:focus {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
}

.theme-icon {
  transition: transform var(--transition-fast);
}

.theme-toggle:hover .theme-icon {
  transform: rotate(15deg);
}

/* Mobile positioning for theme toggle */
@media (max-width: 767px) {
  .theme-toggle {
    top: var(--space-md);
    right: var(--space-md);
    width: 44px;
    height: 44px;
    padding: var(--space-sm);
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

.hidden { display: none; }
.block { display: block; }

/* Responsive Utilities */
@media (max-width: 767px) {
  .container {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }
  
  .text-display { font-size: var(--text-4xl); }
  .text-headline { font-size: var(--text-3xl); }
  
  .card-padding { padding: var(--space-lg); }
}