/* ============================================
   VARIABLES - Artisanal Art Supply Palette
   ============================================ */
:root {
  /* Brand Colors */
  --color-crimson: #B91C3C;
  --color-crimson-dark: #9A1832;
  --color-cobalt: #1E4D8C;
  --color-cobalt-dark: #163A6E;
  --color-ochre: #C67B3C;
  --color-ochre-dark: #A6662F;
  
  /* Semantic Colors */
  --color-primary: var(--color-crimson);
  --color-primary-hover: var(--color-crimson-dark);
  --color-secondary: var(--color-cobalt);
  --color-accent: var(--color-ochre);
  
  --color-success: #2D6A4F;
  --color-warning: #D4A017;
  --color-danger: #C1121F;
  --color-info: var(--color-cobalt);
  
  /* Neutral Grays - Warm Tinted */
  --color-background: #FAF9F6;
  --color-surface: #FFFFFF;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #4A4A4A;
  --color-text-muted: #8B8680;
  
  --gray-50: #FAFAF8;
  --gray-100: #F5F4F1;
  --gray-200: #E8E6E1;
  --gray-300: #D4D0C8;
  --gray-400: #A8A39A;
  --gray-500: #7C7872;
  --gray-600: #5C5852;
  --gray-700: #3D3A36;
  --gray-800: #2A2825;
  --gray-900: #1A1917;
  
  /* Typography */
  --font-heading: 'Cormorant Garamond', 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', Consolas, monospace;
  
  /* Font Sizes - Modular Scale */
  --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: 2rem;      /* 32px */
  --text-4xl: 2.5rem;    /* 40px */
  --text-5xl: 3rem;      /* 48px */
  --text-6xl: 4rem;      /* 64px */
  
  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;
  
  /* Spacing Scale */
  --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 */
  
  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 1rem;      /* 16px */
  --radius-xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Shadows - Soft & Airy */
  --shadow-sm: 0 1px 2px 0 rgb(26 25 23 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(26 25 23 / 0.08), 0 2px 4px -2px rgb(26 25 23 / 0.04);
  --shadow-lg: 0 10px 15px -3px rgb(26 25 23 / 0.08), 0 4px 6px -4px rgb(26 25 23 / 0.04);
  --shadow-xl: 0 20px 25px -5px rgb(26 25 23 / 0.08), 0 8px 10px -6px rgb(26 25 23 / 0.04);
  --shadow-2xl: 0 25px 50px -12px rgb(26 25 23 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(26 25 23 / 0.05);
  --shadow-colored: 0 10px 15px -3px rgb(185 28 60 / 0.15);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-Index Scale */
  --z-hide: -1;
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
}

/* ============================================
   RESET & NORMALIZE
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  min-height: 100vh;
  line-height: var(--leading-normal);
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* ============================================
   BASE STYLES
   ============================================ */
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  color: var(--color-text-primary);
  background-color: var(--color-background);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

h1 { font-size: var(--text-4xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-3xl); margin-bottom: var(--space-5); }
h3 { font-size: var(--text-2xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-xl); margin-bottom: var(--space-3); }
h5 { font-size: var(--text-lg); margin-bottom: var(--space-2); }
h6 { font-size: var(--text-base); margin-bottom: var(--space-2); }

p {
  margin-bottom: var(--space-4);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

/* ============================================
   UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: 1440px;
  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);
  }
}

@media (min-width: 1280px) {
  .container {
    padding-left: var(--space-12);
    padding-right: var(--space-12);
  }
}

/* Flex Helpers */
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

/* Grid Helpers */
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 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;
}

/* ============================================
   COMPONENTS
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: var(--leading-none);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
}

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

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

.btn--primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-colored);
}

.btn--secondary {
  background-color: var(--color-secondary);
  color: white!important;
}

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-cobalt-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn--accent:hover:not(:disabled) {
  background-color: var(--color-ochre-dark);
  transform: translateY(-2px);
}

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

.btn--outline:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: white;
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-primary);
}

.btn--ghost:hover:not(:disabled) {
  background-color: var(--gray-100);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* Inputs */
.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.input:hover,
.textarea:hover,
.select:hover {
  border-color: var(--gray-400);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(185 28 60 / 0.1);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-muted);
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  background-color: var(--gray-100);
  cursor: not-allowed;
}

.textarea {
  min-height: 120px;
  resize: vertical;
}

/* Cards */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

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

.card--flat {
  box-shadow: none;
  border: 1px solid var(--gray-200);
}

.card--elevated {
  box-shadow: var(--shadow-lg);
}

.card--product {
  overflow: hidden;
  padding: 0;
}

.card--product .card__content {
  padding: var(--space-6);
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
:focus-visible {
  outline: 2px solid var(--color-cobalt);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-contrast: high) {
  :root {
    --color-text-primary: #000000;
    --color-background: #FFFFFF;
    --color-primary: #000000;
    --shadow-sm: none;
    --shadow-md: none;
    --shadow-lg: none;
  }
  
  .card,
  .btn,
  .input {
    border: 2px solid currentColor;
  }
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
}