/**
 * UNIFIED DESIGN SYSTEM - Sweet Layers Theme Configuration
 * 
 * This file defines the complete design system for Sweet Layers and related projects.
 * All theme properties, design tokens, and component styles are centralized here
 * to ensure consistency across multiple projects and pages.
 * 
 * ARCHITECTURE:
 * - Design Tokens: Semantic naming with fallbacks
 * - Theme Variants: Light, dark, and high-contrast modes
 * - Component Styles: Reusable theme-aware components
 * - Typography System: Shared fonts with loading strategies
 * - Responsive Design: Mobile-first approach
 * - Accessibility: WCAG 2.1 AA compliance
 */

// ========== DESIGN TOKENS ==========

:root {
  /* ========== BRAND IDENTITY ========== */
  --brand-primary: #2A6B52;
  --brand-primary-dark: #1F4A3A;
  --brand-primary-light: #E8F5F0;
  --brand-accent: #C4A647;
  --brand-accent-dark: #B3941A;
  
  /* ========== NEUTRAL PALETTE ========== */
  --neutral-50: #FDF9F5;
  --neutral-100: #F5EDE4;
  --neutral-200: #E8DCD0;
  --neutral-300: #D4C4B5;
  --neutral-400: #B8A08A;
  --neutral-500: #9A7D6A;
  --neutral-600: #7A5F4A;
  --neutral-700: #5A4535;
  --neutral-800: #3D2E22;
  --neutral-900: #2A1F15;
  
  /* ========== SEMANTIC COLORS ========== */
  --color-background: var(--neutral-50);
  --color-surface: var(--white);
  --color-text-primary: var(--neutral-800);
  --color-text-secondary: var(--neutral-600);
  --color-text-tertiary: var(--neutral-500);
  --color-text-inverse: var(--white);
  --color-border: var(--neutral-200);
  --color-border-hover: var(--neutral-300);
  --color-border-focus: var(--brand-primary);
  
  /* ========== STATUS COLORS ========== */
  --color-success: #22c55e;
  --color-success-light: #dcfce7;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-error: #ef4444;
  --color-error-light: #fef2f2;
  --color-info: #3b82f6;
  --color-info-light: #eff6ff;
  
  /* ========== TYPOGRAPHY SYSTEM ========== */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  --font-secondary: 'Playfair Display', 'Georgia', 'Times New Roman', serif;
  --font-accent: 'Cormorant Garamond', 'Georgia', 'Times New Roman', serif;
  --font-body: 'Lora', 'Georgia', 'Times New Roman', serif;
  --font-ui: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Raleway', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
  
  /* Font Loading Strategy */
  --font-display: swap;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Typography Scale - Modular Scale (1.250) */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  
  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  /* Letter Spacing */
  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;
  --tracking-widest: 0.1em;
  
  /* ========== SPACING SYSTEM ========== */
  /* 4px base unit for consistency */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Component-specific spacing */
  --spacing-xs: var(--space-1);
  --spacing-sm: var(--space-2);
  --spacing-md: var(--space-4);
  --spacing-lg: var(--space-6);
  --spacing-xl: var(--space-8);
  --spacing-2xl: var(--space-12);
  --spacing-3xl: var(--space-16);
  
  /* ========== BORDER RADIUS ========== */
  --radius-none: 0;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* ========== 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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Brand-specific shadows */
  --shadow-brand: 0 8px 32px rgba(42, 107, 82, 0.15);
  --shadow-brand-hover: 0 12px 40px rgba(42, 107, 82, 0.25);
  --shadow-accent: 0 4px 16px rgba(196, 166, 71, 0.2);
  
  /* ========== Z-INDEX SCALE ========== */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
  
  /* ========== ANIMATIONS & TRANSITIONS ========== */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-all: all var(--transition-normal);
  
  /* Animation durations */
  --duration-75: 75ms;
  --duration-100: 100ms;
  --duration-150: 150ms;
  --duration-200: 200ms;
  --duration-300: 300ms;
  --duration-500: 500ms;
  --duration-700: 700ms;
  --duration-1000: 1000ms;
  
  /* Animation easing functions */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* ========== BREAKPOINTS ========== */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
  
  /* ========== CONTAINER SIZES ========== */
  --container-xs: 20rem;
  --container-sm: 24rem;
  --container-md: 28rem;
  --container-lg: 32rem;
  --container-xl: 36rem;
  --container-2xl: 42rem;
  --container-3xl: 48rem;
  --container-4xl: 56rem;
  --container-5xl: 64rem;
  --container-6xl: 72rem;
  --container-7xl: 80rem;
  
  /* ========== COMPONENT-SPECIFIC TOKENS ========== */
  
  /* Buttons */
  --button-height-sm: 2rem;
  --button-height-md: 2.5rem;
  --button-height-lg: 3rem;
  --button-padding-x-sm: var(--spacing-sm);
  --button-padding-x-md: var(--spacing-md);
  --button-padding-x-lg: var(--spacing-lg);
  
  /* Forms */
  --form-input-height: 2.5rem;
  --form-input-padding-x: var(--spacing-md);
  --form-input-border-width: 1px;
  --form-input-border-radius: var(--radius-md);
  
  /* Cards */
  --card-padding: var(--spacing-lg);
  --card-border-radius: var(--radius-lg);
  --card-shadow: var(--shadow-md);
  --card-hover-shadow: var(--shadow-lg);
  
  /* Navigation */
  --nav-height: 4rem;
  --nav-padding-x: var(--spacing-lg);
  --nav-link-padding: var(--spacing-sm) var(--spacing-md);
  
  /* Footer */
  --footer-padding-y: var(--spacing-3xl);
  --footer-padding-x: var(--spacing-lg);
  
  /* ========== LAYOUT GRID ========== */
  --grid-cols-1: repeat(1, minmax(0, 1fr));
  --grid-cols-2: repeat(2, minmax(0, 1fr));
  --grid-cols-3: repeat(3, minmax(0, 1fr));
  --grid-cols-4: repeat(4, minmax(0, 1fr));
  --grid-cols-5: repeat(5, minmax(0, 1fr));
  --grid-cols-6: repeat(6, minmax(0, 1fr));
  --grid-cols-12: repeat(12, minmax(0, 1fr));
  
  --grid-gap-xs: var(--spacing-xs);
  --grid-gap-sm: var(--spacing-sm);
  --grid-gap-md: var(--spacing-md);
  --grid-gap-lg: var(--spacing-lg);
  --grid-gap-xl: var(--spacing-xl);
}

/* ========== DARK THEME VARIANT ========== */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: var(--neutral-900);
    --color-surface: var(--neutral-800);
    --color-text-primary: var(--neutral-100);
    --color-text-secondary: var(--neutral-300);
    --color-text-tertiary: var(--neutral-400);
    --color-border: var(--neutral-700);
    --color-border-hover: var(--neutral-600);
    
    /* Adjust brand colors for dark mode */
    --brand-primary-light: #1F4A3A;
    --brand-accent: #D4A647;
  }
}

/* ========== HIGH CONTRAST VARIANT ========== */
@media (prefers-contrast: high) {
  :root {
    --color-border: var(--neutral-600);
    --color-border-hover: var(--neutral-500);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  }
}

/* ========== REDUCED MOTION ========== */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0ms;
    --transition-normal: 0ms;
    --transition-slow: 0ms;
    --transition-all: none;
  }
}

/* ========== THEME PROVIDER CLASSES ========== */

/* Base theme application */
.theme-provider {
  color-scheme: light;
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.theme-provider.dark {
  color-scheme: dark;
}

.theme-provider.high-contrast {
  --color-border: var(--neutral-600);
  --color-border-hover: var(--neutral-500);
}

/* ========== TYPOGRAPHY UTILITIES ========== */

/* Font families */
.font-primary { font-family: var(--font-primary); }
.font-secondary { font-family: var(--font-secondary); }
.font-accent { font-family: var(--font-accent); }
.font-body { font-family: var(--font-body); }
.font-ui { font-family: var(--font-ui); }
.font-heading { font-family: var(--font-heading); }
.font-mono { font-family: var(--font-mono); }

/* Font sizes */
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }
.text-6xl { font-size: var(--text-6xl); }

/* Font weights */
.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }
.font-extrabold { font-weight: var(--font-weight-extrabold); }

/* Line heights */
.leading-none { line-height: var(--leading-none); }
.leading-tight { line-height: var(--leading-tight); }
.leading-snug { line-height: var(--leading-snug); }
.leading-normal { line-height: var(--leading-normal); }
.leading-relaxed { line-height: var(--leading-relaxed); }
.leading-loose { line-height: var(--leading-loose); }

/* Letter spacing */
.tracking-tighter { letter-spacing: var(--tracking-tighter); }
.tracking-tight { letter-spacing: var(--tracking-tight); }
.tracking-normal { letter-spacing: var(--tracking-normal); }
.tracking-wide { letter-spacing: var(--tracking-wide); }
.tracking-wider { letter-spacing: var(--tracking-wider); }
.tracking-widest { letter-spacing: var(--tracking-widest); }

/* ========== COLOR UTILITIES ========== */

/* Text colors */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-inverse { color: var(--color-text-inverse); }
.text-brand { color: var(--brand-primary); }
.text-accent { color: var(--brand-accent); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-info { color: var(--color-info); }

/* Background colors */
.bg-background { background-color: var(--color-background); }
.bg-surface { background-color: var(--color-surface); }
.bg-brand { background-color: var(--brand-primary); }
.bg-brand-dark { background-color: var(--brand-primary-dark); }
.bg-brand-light { background-color: var(--brand-primary-light); }
.bg-accent { background-color: var(--brand-accent); }
.bg-success { background-color: var(--color-success); }
.bg-warning { background-color: var(--color-warning); }
.bg-error { background-color: var(--color-error); }
.bg-info { background-color: var(--color-info); }

/* ========== SPACING UTILITIES ========== */

.p-0 { padding: var(--space-0); }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }
.p-10 { padding: var(--space-10); }
.p-12 { padding: var(--space-12); }
.p-16 { padding: var(--space-16); }
.p-20 { padding: var(--space-20); }
.p-24 { padding: var(--space-24); }
.p-32 { padding: var(--space-32); }

.m-0 { margin: var(--space-0); }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }
.m-5 { margin: var(--space-5); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }
.m-10 { margin: var(--space-10); }
.m-12 { margin: var(--space-12); }
.m-16 { margin: var(--space-16); }
.m-20 { margin: var(--space-20); }
.m-24 { margin: var(--space-24); }
.m-32 { margin: var(--space-32); }

/* Semantic spacing */
.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }
.p-2xl { padding: var(--spacing-2xl); }
.p-3xl { padding: var(--spacing-3xl); }

.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }
.m-2xl { margin: var(--spacing-2xl); }
.m-3xl { margin: var(--spacing-3xl); }

/* ========== LAYOUT UTILITIES ========== */

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

@media (min-width: 640px) {
  .container { max-width: var(--container-sm); }
}
@media (min-width: 768px) {
  .container { max-width: var(--container-md); }
}
@media (min-width: 1024px) {
  .container { max-width: var(--container-lg); }
}
@media (min-width: 1280px) {
  .container { max-width: var(--container-xl); }
}
@media (min-width: 1536px) {
  .container { max-width: var(--container-2xl); }
}

/* Grid */
.grid {
  display: grid;
  gap: var(--grid-gap-md);
}

.grid-cols-1 { grid-template-columns: var(--grid-cols-1); }
.grid-cols-2 { grid-template-columns: var(--grid-cols-2); }
.grid-cols-3 { grid-template-columns: var(--grid-cols-3); }
.grid-cols-4 { grid-template-columns: var(--grid-cols-4); }
.grid-cols-5 { grid-template-columns: var(--grid-cols-5); }
.grid-cols-6 { grid-template-columns: var(--grid-cols-6); }
.grid-cols-12 { grid-template-columns: var(--grid-cols-12); }

.gap-xs { gap: var(--grid-gap-xs); }
.gap-sm { gap: var(--grid-gap-sm); }
.gap-md { gap: var(--grid-gap-md); }
.gap-lg { gap: var(--grid-gap-lg); }
.gap-xl { gap: var(--grid-gap-xl); }

/* Flexbox */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

/* ========== COMPONENT BASE STYLES ========== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0 var(--button-padding-x-md);
  height: var(--button-height-md);
  font-family: var(--font-ui);
  font-weight: var(--font-weight-medium);
  font-size: var(--text-sm);
  line-height: var(--leading-none);
  letter-spacing: var(--tracking-wide);
  text-decoration: none;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-all);
  user-select: none;
  white-space: nowrap;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button variants */
.btn-primary {
  background-color: var(--brand-primary);
  color: var(--color-text-inverse);
  border-color: var(--brand-primary);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--brand-primary-dark);
  border-color: var(--brand-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-brand);
}

.btn-secondary {
  background-color: transparent;
  color: var(--brand-primary);
  border-color: var(--brand-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--brand-primary);
  color: var(--color-text-inverse);
}

.btn-accent {
  background-color: var(--brand-accent);
  color: var(--color-text-inverse);
  border-color: var(--brand-accent);
}

.btn-accent:hover:not(:disabled) {
  background-color: var(--brand-accent-dark);
  border-color: var(--brand-accent-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-accent);
}

/* Button sizes */
.btn-sm {
  height: var(--button-height-sm);
  padding: 0 var(--button-padding-x-sm);
  font-size: var(--text-xs);
}

.btn-lg {
  height: var(--button-height-lg);
  padding: 0 var(--button-padding-x-lg);
  font-size: var(--text-base);
}

/* Form elements */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-label {
  font-family: var(--font-ui);
  font-weight: var(--font-weight-medium);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  height: var(--form-input-height);
  padding: 0 var(--form-input-padding-x);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: var(--form-input-border-width) solid var(--color-border);
  border-radius: var(--form-input-border-radius);
  transition: var(--transition-all);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px rgba(42, 107, 82, 0.1);
}

.form-input::placeholder,
.form-select::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-tertiary);
}

.form-textarea {
  min-height: 6rem;
  resize: vertical;
  padding: var(--spacing-sm) var(--form-input-padding-x);
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--card-border-radius);
  box-shadow: var(--card-shadow);
  transition: var(--transition-all);
  overflow: hidden;
}

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

.card-header {
  padding: var(--card-padding);
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  padding: var(--card-padding);
}

.card-footer {
  padding: var(--card-padding);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-background);
}

/* ========== ACCESSIBILITY ========== */

/* Skip links */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--brand-primary);
  color: var(--color-text-inverse);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: var(--z-tooltip);
  transition: var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* Focus visible */
.focus-visible:focus {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========== RESPONSIVE HELPERS ========== */

@media (max-width: 639px) {
  .sm\:hidden { display: none !important; }
}

@media (min-width: 640px) and (max-width: 767px) {
  .md\:hidden { display: none !important; }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .lg\:hidden { display: none !important; }
}

@media (min-width: 1024px) {
  .xl\:hidden { display: none !important; }
}

/* ========== PRINT STYLES ========== */
@media print {
  .print\:hidden {
    display: none !important;
  }
  
  * {
    color: black !important;
    background: white !important;
    box-shadow: none !important;
  }
}