/**
 * ESPRIT CRÉATIF DESIGN SYSTEM
 * Senior Design Standards - Meta Level Quality
 *
 * Design Principles:
 * 1. Clarity & Hierarchy
 * 2. Consistency & Patterns
 * 3. Efficiency & Performance
 * 4. Accessibility First
 * 5. Delight & Polish
 */

:root {
  /* ============================================
     COLOR SYSTEM - Semantic & Purposeful
     ============================================ */

  /* Brand Colors */
  --color-brand-primary: #f2ecd4;
  --color-brand-primary-hover: #e6dfc5;
  --color-brand-primary-light: #f8f5ea;
  --color-brand-primary-dark: #d4c8a8;

  --color-brand-secondary: #181714;
  --color-brand-accent: #d4a574;
  --color-brand-accent-light: #e6c9a0;

  /* Neutral Scale - 12 point system */
  --color-gray-50: #fafaf9;
  --color-gray-100: #f5f5f4;
  --color-gray-200: #e7e5e4;
  --color-gray-300: #d6d3d1;
  --color-gray-400: #a8a29e;
  --color-gray-500: #78716c;
  --color-gray-600: #57534e;
  --color-gray-700: #44403c;
  --color-gray-800: #292524;
  --color-gray-900: #1c1917;
  --color-gray-950: #0c0a09;

  /* Functional Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* ============================================
     TYPOGRAPHY SYSTEM
     ============================================ */

  /* Font Families */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes - Modular Scale (1.250 - Major Third) */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  --text-7xl: 4.5rem;      /* 72px */
  --text-8xl: 6rem;        /* 96px */

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  --font-black: 900;

  /* 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 - 8pt Grid
     ============================================ */

  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */
  --space-40: 10rem;    /* 160px */
  --space-48: 12rem;    /* 192px */
  --space-56: 14rem;    /* 224px */
  --space-64: 16rem;    /* 256px */

  /* ============================================
     ELEVATION SYSTEM - Shadows
     ============================================ */

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Colored Shadows */
  --shadow-primary: 0 10px 40px -10px rgba(242, 236, 212, 0.4);
  --shadow-secondary: 0 10px 40px -10px rgba(24, 23, 20, 0.3);

  /* ============================================
     BORDER RADIUS SYSTEM
     ============================================ */

  --radius-none: 0;
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-3xl: 2rem;      /* 32px */
  --radius-full: 9999px;

  /* ============================================
     TRANSITIONS & ANIMATIONS
     ============================================ */

  /* Duration */
  --duration-instant: 0ms;
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 350ms;
  --duration-slower: 500ms;

  /* Easing Functions - Natural Motion */
  --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);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* ============================================
     Z-INDEX SYSTEM
     ============================================ */

  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1100;
  --z-fixed: 1200;
  --z-overlay: 1300;
  --z-modal: 1400;
  --z-popover: 1500;
  --z-tooltip: 1600;
  --z-notification: 1700;

  /* ============================================
     LAYOUT CONSTRAINTS
     ============================================ */

  --container-xs: 20rem;    /* 320px */
  --container-sm: 24rem;    /* 384px */
  --container-md: 28rem;    /* 448px */
  --container-lg: 32rem;    /* 512px */
  --container-xl: 36rem;    /* 576px */
  --container-2xl: 42rem;   /* 672px */
  --container-3xl: 48rem;   /* 768px */
  --container-4xl: 56rem;   /* 896px */
  --container-5xl: 64rem;   /* 1024px */
  --container-6xl: 72rem;   /* 1152px */
  --container-7xl: 80rem;   /* 1280px */

  /* ============================================
     BLUR & BACKDROP EFFECTS
     ============================================ */

  --blur-sm: 4px;
  --blur-base: 8px;
  --blur-md: 12px;
  --blur-lg: 16px;
  --blur-xl: 24px;
  --blur-2xl: 40px;
  --blur-3xl: 64px;
}

/* ============================================
   DARK MODE VARIABLES
   ============================================ */

.dark {
  --color-bg-primary: #0c0a09;
  --color-bg-secondary: #1c1917;
  --color-bg-tertiary: #292524;

  --color-text-primary: #fafaf9;
  --color-text-secondary: #e7e5e4;
  --color-text-tertiary: #a8a29e;

  --color-border-primary: rgba(255, 255, 255, 0.1);
  --color-border-secondary: rgba(255, 255, 255, 0.05);

  /* Adjust shadows for dark mode */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
}

/* ============================================
   BASE STYLES - Reset & Foundations
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-gray-900);
  background-color: white;
  transition: background-color var(--duration-base) var(--ease-in-out);
}

.dark body {
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

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

.text-display-1 {
  font-family: var(--font-display);
  font-size: var(--text-8xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-none);
  letter-spacing: var(--tracking-tighter);
}

.text-display-2 {
  font-family: var(--font-display);
  font-size: var(--text-7xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.text-display-3 {
  font-family: var(--font-display);
  font-size: var(--text-6xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
}

.text-heading-1 {
  font-size: var(--text-5xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
}

.text-heading-2 {
  font-size: var(--text-4xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
}

.text-heading-3 {
  font-size: var(--text-3xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
}

.text-body-large {
  font-size: var(--text-xl);
  line-height: var(--leading-relaxed);
}

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

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

.text-caption {
  font-size: var(--text-xs);
  line-height: var(--leading-normal);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

/* ============================================
   COMPONENT PATTERNS
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-out);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-accent) 100%);
  color: var(--color-brand-secondary);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-xl), var(--shadow-primary);
}

.btn-secondary {
  background: var(--color-brand-secondary);
  color: white;
  box-shadow: var(--shadow-secondary);
}

.btn-secondary:hover {
  background: var(--color-gray-800);
  transform: translateY(-2px) scale(1.02);
}

.btn-ghost {
  background: transparent;
  color: var(--color-gray-700);
  border: 2px solid var(--color-gray-200);
}

.btn-ghost:hover {
  background: var(--color-gray-50);
  border-color: var(--color-brand-primary);
  color: var(--color-brand-secondary);
}

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all var(--duration-base) var(--ease-out);
  border: 1px solid var(--color-gray-100);
}

.dark .card {
  background: var(--color-bg-secondary);
  border-color: var(--color-border-primary);
  box-shadow: var(--shadow-lg);
}

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

.dark .card:hover {
  border-color: var(--color-brand-primary);
  box-shadow: var(--shadow-2xl), 0 0 0 1px var(--color-brand-primary);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  line-height: var(--leading-none);
  border-radius: var(--radius-full);
  background: var(--color-brand-primary);
  color: var(--color-brand-secondary);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

/* Glassmorphism */
.glass {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(var(--blur-xl)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--blur-xl)) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.dark .glass {
  background: rgba(0, 0, 0, 0.5);
  border-color: rgba(255, 255, 255, 0.1);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-7xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

/* Focus Styles */
*:focus-visible {
  outline: 2px solid var(--color-brand-primary);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background-color: var(--color-brand-primary);
  color: var(--color-brand-secondary);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

.dark ::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-brand-primary);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-gray-100);
}

.dark ::-webkit-scrollbar-thumb {
  border-color: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-brand-accent);
}