/* ============================================
   CSS Variables
   ============================================ */

:root {
  /* Color Palette - Vibrant & Whimsical */
  --color-background: #fdfbf7;
  --color-surface: #ffffff;
  --color-surface-secondary: #f5f2ed;
  
  --color-primary: #4a90d9;
  --color-primary-light: #6ba8e5;
  --color-primary-dark: #3574b8;
  --color-primary-subtle: #e8f2fb;
  
  --color-secondary: #d4a747;
  --color-secondary-light: #e5c26f;
  --color-secondary-dark: #b88c2f;
  --color-secondary-subtle: #fdf7e8;
  
  --color-accent: #8b7ba8;
  --color-accent-light: #a695bf;
  --color-accent-subtle: #f2eff7;
  
  --color-text: #2d3142;
  --color-text-secondary: #5a6175;
  --color-text-muted: #8b92a9;
  --color-text-inverse: #ffffff;
  
  --color-success: #52b788;
  --color-success-light: #74c69d;
  --color-success-subtle: #e8f5ee;
  
  --color-warning: #f4a261;
  --color-warning-light: #f7b883;
  --color-warning-subtle: #fef3eb;
  
  --color-danger: #e76f51;
  --color-danger-light: #ed8b78;
  --color-danger-subtle: #fdeee9;
  
  --color-neutral-50: #fafbfc;
  --color-neutral-100: #f4f5f7;
  --color-neutral-200: #e8eaed;
  --color-neutral-300: #d4d7dd;
  --color-neutral-400: #b0b5bf;
  --color-neutral-500: #8b92a9;
  --color-neutral-600: #6b7280;
  --color-neutral-700: #4b5563;
  --color-neutral-800: #374151;
  --color-neutral-900: #1f2937;
  
  /* Typography */
  --font-family-base: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-family-heading: 'Georgia', 'Cambria', 'Times New Roman', serif;
  --font-family-accent: 'Verdana', 'Geneva', sans-serif;
  
  --font-size-xs: 0.75rem;      /* 12px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-base: 1rem;       /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --font-size-3xl: 1.875rem;    /* 30px */
  --font-size-4xl: 2.25rem;     /* 36px */
  --font-size-5xl: 3rem;        /* 48px */
  --font-size-6xl: 3.75rem;     /* 60px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;
  
  /* Spacing Scale */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-7: 1.75rem;   /* 28px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  --spacing-20: 5rem;     /* 80px */
  --spacing-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;   /* 4px */
  --radius-base: 0.5rem;  /* 8px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1rem;      /* 16px */
  --radius-xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(45, 49, 66, 0.05);
  --shadow-sm: 0 2px 4px 0 rgba(45, 49, 66, 0.08);
  --shadow-base: 0 4px 8px 0 rgba(45, 49, 66, 0.1);
  --shadow-md: 0 6px 16px 0 rgba(45, 49, 66, 0.12);
  --shadow-lg: 0 12px 24px 0 rgba(45, 49, 66, 0.15);
  --shadow-xl: 0 20px 40px 0 rgba(45, 49, 66, 0.2);
  
  --shadow-primary: 0 4px 12px 0 rgba(74, 144, 217, 0.25);
  --shadow-secondary: 0 4px 12px 0 rgba(212, 167, 71, 0.25);
  
  /* Transitions */
  --transition-fast: 150ms;
  --transition-base: 250ms;
  --transition-slow: 350ms;
  --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Layout */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-4);
  --content-max-width: 65ch;
  
  /* 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;
}

/* ============================================
   Reset & Normalize
   ============================================ */

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

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

@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;
  }
}

html,
body {
  height: 100%;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  overflow-x: hidden;
}

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 Typography
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--spacing-4);
}

h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-6);
}

h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-5);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

@media (min-width: 768px) {
  h1 {
    font-size: var(--font-size-5xl);
  }
  
  h2 {
    font-size: var(--font-size-4xl);
  }
  
  h3 {
    font-size: var(--font-size-3xl);
  }
}

p {
  margin-bottom: var(--spacing-4);
  max-width: var(--content-max-width);
}

p:last-child {
  margin-bottom: 0;
}

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

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

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

strong,
b {
  font-weight: var(--font-weight-semibold);
}

em,
i {
  font-style: italic;
}

small {
  font-size: var(--font-size-sm);
}

blockquote {
  margin: var(--spacing-6) 0;
  padding-left: var(--spacing-6);
  border-left: 4px solid var(--color-primary);
  font-style: italic;
  color: var(--color-text-secondary);
}

code,
pre {
  font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
}

code {
  padding: var(--spacing-1) var(--spacing-2);
  background-color: var(--color-neutral-100);
  border-radius: var(--radius-sm);
}

pre {
  padding: var(--spacing-4);
  background-color: var(--color-neutral-100);
  border-radius: var(--radius-base);
  overflow-x: auto;
  margin-bottom: var(--spacing-4);
}

hr {
  border: 0;
  border-top: 1px solid var(--color-neutral-200);
  margin: var(--spacing-8) 0;
}

/* ============================================
   Utilities
   ============================================ */

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

@media (min-width: 768px) {
  .container {
    --container-padding: var(--spacing-6);
  }
}

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

/* 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-width: 0;
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.gap-2 {
  gap: var(--spacing-2);
}

.gap-4 {
  gap: var(--spacing-4);
}

.gap-6 {
  gap: var(--spacing-6);
}

.gap-8 {
  gap: var(--spacing-8);
}

/* Grid Utilities */
.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));
}

@media (min-width: 768px) {
  .md\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  
  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  
  .lg\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* Text Alignment */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

/* Text Colors */
.text-primary {
  color: var(--color-primary);
}

.text-secondary {
  color: var(--color-text-secondary);
}

.text-muted {
  color: var(--color-text-muted);
}

/* Spacing Utilities */
.mt-4 {
  margin-top: var(--spacing-4);
}

.mt-6 {
  margin-top: var(--spacing-6);
}

.mt-8 {
  margin-top: var(--spacing-8);
}

.mb-4 {
  margin-bottom: var(--spacing-4);
}

.mb-6 {
  margin-bottom: var(--spacing-6);
}

.mb-8 {
  margin-bottom: var(--spacing-8);
}

.pt-8 {
  padding-top: var(--spacing-8);
}

.pt-12 {
  padding-top: var(--spacing-12);
}

.pb-8 {
  padding-bottom: var(--spacing-8);
}

.pb-12 {
  padding-bottom: var(--spacing-12);
}

/* ============================================
   Components
   ============================================ */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  text-align: center;
  white-space: nowrap;
  border-radius: var(--radius-base);
  border: 2px solid transparent;
  transition: all var(--transition-base) var(--transition-timing);
  cursor: pointer;
  user-select: none;
}

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

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

/* Button Primary */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

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

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Button Secondary */
.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--color-secondary-dark);
  box-shadow: var(--shadow-secondary);
  transform: translateY(-1px);
}

.btn-secondary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

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

.btn-outline:hover {
  background-color: var(--color-primary-subtle);
  border-color: var(--color-primary-dark);
  color: var(--color-primary-dark);
}

/* Button Ghost */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text);
}

.btn-ghost:hover {
  background-color: var(--color-neutral-100);
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
}

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

/* Input Fields */
.input,
.textarea,
.select {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 2px solid var(--color-neutral-300);
  border-radius: var(--radius-base);
  transition: all var(--transition-base) var(--transition-timing);
}

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

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.input:disabled,
.textarea:disabled,
.select:disabled {
  background-color: var(--color-neutral-100);
  cursor: not-allowed;
  opacity: 0.6;
}

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

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

/* Card Component */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-base);
  transition: all var(--transition-base) var(--transition-timing);
}

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

.card-header {
  margin-bottom: var(--spacing-4);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-neutral-200);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-2);
}

.card-body {
  margin-bottom: var(--spacing-4);
}

.card-footer {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-neutral-200);
}

/* Badge Component */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border-radius: var(--radius-full);
  background-color: var(--color-neutral-200);
  color: var(--color-text);
}

.badge-primary {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary-dark);
}

.badge-secondary {
  background-color: var(--color-secondary-subtle);
  color: var(--color-secondary-dark);
}

.badge-success {
  background-color: var(--color-success-subtle);
  color: var(--color-success);
}

.badge-warning {
  background-color: var(--color-warning-subtle);
  color: var(--color-warning);
}

.badge-danger {
  background-color: var(--color-danger-subtle);
  color: var(--color-danger);
}

/* Alert Component */
.alert {
  padding: var(--spacing-4) var(--spacing-5);
  border-radius: var(--radius-base);
  border-left: 4px solid;
  margin-bottom: var(--spacing-4);
}

.alert-success {
  background-color: var(--color-success-subtle);
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert-warning {
  background-color: var(--color-warning-subtle);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.alert-danger {
  background-color: var(--color-danger-subtle);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.alert-info {
  background-color: var(--color-primary-subtle);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

/* ============================================
   Accessibility
   ============================================ */

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

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip to Content Link */
.skip-to-content {
  position: absolute;
  top: var(--spacing-4);
  left: var(--spacing-4);
  padding: var(--spacing-3) var(--spacing-6);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-radius: var(--radius-base);
  font-weight: var(--font-weight-semibold);
  z-index: var(--z-tooltip);
  transform: translateY(-200%);
  transition: transform var(--transition-base) var(--transition-timing);
}

.skip-to-content:focus {
  transform: translateY(0);
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-text: #000000;
    --color-background: #ffffff;
  }
  
  .btn {
    border-width: 2px;
  }
}

/* Dark Mode Preference (Optional Foundation) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #1a1d2e;
    --color-surface: #22273b;
    --color-surface-secondary: #2a2f45;
    --color-text-secondary: #b0b5bf;
    --color-text-muted: #8b92a9;
  }
}

/* Print Styles */
@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  a,
  a:visited {
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
  }
  
  img {
    page-break-inside: avoid;
  }
  
  h2,
  h3,
  p {
    orphans: 3;
    widows: 3;
  }
  
  h2,
  h3 {
    page-break-after: avoid;
  }
}