/**
 * AI Services Blog - Base Styles
 * Foundation CSS for the AI Services Blog feature
 * 
 * Features:
 * - CSS Custom Properties for design system consistency
 * - Mobile-first responsive design
 * - Bootstrap + Tailwind CSS compatible
 * - Semantic typography hierarchy
 * - Base utilities and component foundation
 * 
 * Requirements: 5.3, 10.1-10.6, 13.5-13.7
 */

/* ===================================================================
   1. CSS CUSTOM PROPERTIES (Design System Variables)
   =================================================================== */

:root {
  /* Color Palette */
  --color-primary: #ff1f8e;           /* Primary brand color (pink) */
  --color-primary-dark: #e91e63;      /* Darker primary */
  --color-primary-light: #ff92f6;     /* Lighter primary */
  
  --color-secondary: #4f4daf;         /* Secondary brand color (purple) */
  --color-secondary-dark: #3e35b7;    /* Darker secondary */
  --color-secondary-light: #7affdb;   /* Lighter secondary */
  
  --color-accent: #00baff;            /* Accent color (cyan) */
  --color-accent-dark: #0c6cd3;       /* Darker accent */
  --color-accent-light: #95e5ff;      /* Lighter accent */
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-light-gray: #f8f9fa;
  --color-lighter-gray: #f3f9ff;
  --color-border-gray: #e6e6e6;
  --color-medium-gray: #d4f0ff;
  --color-dark-gray: #6a6a8e;
  --color-darker-gray: #050748;
  --color-black: #0a2233;
  
  /* Semantic Colors */
  --color-success: #8bc34a;
  --color-warning: #ffc107;
  --color-error: #ff5050;
  --color-info: #00baff;
  
  /* Text Colors */
  --text-primary: #050748;
  --text-secondary: #6a6a8e;
  --text-light: #9a9ab0;
  --text-inverse: #ffffff;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f3f9ff;
  --bg-dark: #050748;
  
  /* Typography */
  --font-primary: 'Open Sans', sans-serif;
  --font-secondary: 'Poppins', sans-serif;
  --font-monospace: 'Courier New', monospace;
  
  /* Font Sizes - Modular Scale (1.125 ratio) */
  --font-size-xs: 12px;      /* 0.75rem */
  --font-size-sm: 14px;      /* 0.875rem */
  --font-size-base: 16px;    /* 1rem */
  --font-size-lg: 18px;      /* 1.125rem */
  --font-size-xl: 20px;      /* 1.25rem */
  --font-size-2xl: 24px;     /* 1.5rem */
  --font-size-3xl: 28px;     /* 1.75rem */
  --font-size-4xl: 32px;     /* 2rem */
  --font-size-5xl: 40px;     /* 2.5rem */
  --font-size-6xl: 48px;     /* 3rem */
  --font-size-7xl: 60px;     /* 3.75rem */
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;
  
  /* Spacing Scale - 8px base unit */
  --spacing-0: 0;
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-7: 28px;
  --spacing-8: 32px;
  --spacing-9: 36px;
  --spacing-10: 40px;
  --spacing-12: 48px;
  --spacing-14: 56px;
  --spacing-16: 64px;
  --spacing-20: 80px;
  --spacing-24: 96px;
  --spacing-28: 112px;
  --spacing-32: 128px;
  
  /* Border Radius */
  --radius-none: 0;
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-base: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-none: none;
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-base: 0 3.4px 2.7px -30px rgba(0, 0, 0, 0.059), 
                 0 8.2px 8.9px -30px rgba(0, 0, 0, 0.071), 
                 0 25px 40px -30px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  --transition-slower: 1.2s cubic-bezier(0.17, 0.85, 0.438, 0.99);
  
  /* 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-deep: 9999;
  
  /* Layout */
  --container-width: 1140px;
  --container-padding: var(--spacing-4);
  
  /* Breakpoints */
  --breakpoint-xs: 0;
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  --breakpoint-2xl: 1400px;
}

/* ===================================================================
   2. RESET & NORMALIZATION
   =================================================================== */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

/* ===================================================================
   3. TYPOGRAPHY - HEADINGS
   =================================================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-secondary);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-6);
}

h1 {
  font-size: var(--font-size-7xl);
  line-height: 72px;
  letter-spacing: -0.5px;
  
  @media (max-width: 768px) {
    font-size: var(--font-size-5xl);
    line-height: 48px;
  }
}

h2 {
  font-size: var(--font-size-5xl);
  line-height: 60px;
  letter-spacing: -0.3px;
  
  @media (max-width: 768px) {
    font-size: var(--font-size-4xl);
    line-height: 44px;
  }
}

h3 {
  font-size: var(--font-size-3xl);
  line-height: 40px;
  letter-spacing: -0.2px;
  
  @media (max-width: 768px) {
    font-size: var(--font-size-2xl);
    line-height: 32px;
  }
}

h4 {
  font-size: var(--font-size-2xl);
  line-height: 32px;
}

h5 {
  font-size: var(--font-size-xl);
  line-height: 28px;
}

h6 {
  font-size: var(--font-size-lg);
  line-height: 26px;
}

/* ===================================================================
   4. TYPOGRAPHY - BODY TEXT
   =================================================================== */

p {
  margin-bottom: var(--spacing-4);
  line-height: var(--line-height-relaxed);
  
  &:last-child {
    margin-bottom: 0;
  }
}

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

strong,
.text-bold {
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

em,
.text-italic {
  font-style: italic;
}

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

.text-muted {
  color: var(--text-light);
  opacity: 0.8;
}

/* ===================================================================
   5. TYPOGRAPHY - LINKS
   =================================================================== */

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
  
  &:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
  }
  
  &:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-xs);
  }
  
  &:disabled {
    color: var(--text-light);
    cursor: not-allowed;
    pointer-events: none;
  }
}

/* ===================================================================
   6. TYPOGRAPHY - LISTS
   =================================================================== */

ul,
ol {
  margin-bottom: var(--spacing-4);
  padding-left: var(--spacing-6);
}

li {
  margin-bottom: var(--spacing-2);
  line-height: var(--line-height-relaxed);
}

ul ul,
ol ol,
ul ol,
ol ul {
  margin-bottom: 0;
  margin-top: var(--spacing-2);
}

/* ===================================================================
   7. CONTAINER & GRID UTILITIES
   =================================================================== */

.container,
.container-sm,
.container-md,
.container-lg,
.container-xl,
.container-xxl {
  width: 100%;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  margin-left: auto;
  margin-right: auto;
}

.container {
  max-width: var(--container-width);
}

@media (max-width: 576px) {
  .container {
    max-width: 100%;
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
  }
}

@media (min-width: 576px) {
  .container {
    max-width: 540px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
  }
}

@media (min-width: 992px) {
  .container {
    max-width: 960px;
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }
}

/* Grid Utilities */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-left: calc(var(--spacing-4) * -1);
  margin-right: calc(var(--spacing-4) * -1);
}

.row > * {
  flex-shrink: 0;
  width: 100%;
  padding-left: var(--spacing-4);
  padding-right: var(--spacing-4);
}

/* ===================================================================
   8. RESPONSIVE DESIGN - MOBILE FIRST
   =================================================================== */

/* Mobile (default: < 768px) */
@media (max-width: 767.98px) {
  html {
    font-size: 14px;
  }
  
  body {
    font-size: var(--font-size-base);
  }
}

/* Tablet (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1023.98px) {
  html {
    font-size: 15px;
  }
}

/* Desktop (>= 1024px) */
@media (min-width: 1024px) {
  html {
    font-size: 16px;
  }
}

/* Large Desktop (>= 1200px) */
@media (min-width: 1200px) {
  html {
    font-size: 17px;
  }
}

/* ===================================================================
   9. UTILITY CLASSES - TEXT ALIGNMENT
   =================================================================== */

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

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

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

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

@media (min-width: 768px) {
  .md\:text-left {
    text-align: left;
  }
  
  .md\:text-center {
    text-align: center;
  }
  
  .md\:text-right {
    text-align: right;
  }
}

/* ===================================================================
   10. UTILITY CLASSES - DISPLAY & VISIBILITY
   =================================================================== */

.d-none {
  display: none !important;
}

.d-inline {
  display: inline !important;
}

.d-inline-block {
  display: inline-block !important;
}

.d-block {
  display: block !important;
}

.d-flex {
  display: flex !important;
}

.d-grid {
  display: grid !important;
}

.d-table {
  display: table !important;
}

.d-table-cell {
  display: table-cell !important;
}

.invisible {
  visibility: hidden !important;
}

.visible {
  visibility: visible !important;
}

/* Hidden on mobile, visible on desktop */
.d-md-block {
  display: none;
}

@media (min-width: 768px) {
  .d-md-block {
    display: block !important;
  }
  
  .d-md-none {
    display: none !important;
  }
  
  .d-md-flex {
    display: flex !important;
  }
}

/* ===================================================================
   11. UTILITY CLASSES - SPACING
   =================================================================== */

/* Margin */
.m-0 { margin: 0; }
.m-1 { margin: var(--spacing-1); }
.m-2 { margin: var(--spacing-2); }
.m-3 { margin: var(--spacing-3); }
.m-4 { margin: var(--spacing-4); }
.m-5 { margin: var(--spacing-5); }
.m-6 { margin: var(--spacing-6); }
.m-8 { margin: var(--spacing-8); }
.m-10 { margin: var(--spacing-10); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-1); }
.mt-2 { margin-top: var(--spacing-2); }
.mt-3 { margin-top: var(--spacing-3); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-5 { margin-top: var(--spacing-5); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }
.mt-10 { margin-top: var(--spacing-10); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-1); }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-3 { margin-bottom: var(--spacing-3); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-5 { margin-bottom: var(--spacing-5); }
.mb-6 { margin-bottom: var(--spacing-6); }
.mb-8 { margin-bottom: var(--spacing-8); }
.mb-10 { margin-bottom: var(--spacing-10); }

.ml-0 { margin-left: 0; }
.ml-1 { margin-left: var(--spacing-1); }
.ml-2 { margin-left: var(--spacing-2); }
.ml-3 { margin-left: var(--spacing-3); }
.ml-4 { margin-left: var(--spacing-4); }
.ml-5 { margin-left: var(--spacing-5); }
.ml-6 { margin-left: var(--spacing-6); }
.ml-8 { margin-left: var(--spacing-8); }
.ml-auto { margin-left: auto; }

.mr-0 { margin-right: 0; }
.mr-1 { margin-right: var(--spacing-1); }
.mr-2 { margin-right: var(--spacing-2); }
.mr-3 { margin-right: var(--spacing-3); }
.mr-4 { margin-right: var(--spacing-4); }
.mr-5 { margin-right: var(--spacing-5); }
.mr-6 { margin-right: var(--spacing-6); }
.mr-8 { margin-right: var(--spacing-8); }
.mr-auto { margin-right: auto; }

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

/* Padding */
.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-5 { padding: var(--spacing-5); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }
.p-10 { padding: var(--spacing-10); }

.pt-0 { padding-top: 0; }
.pt-2 { padding-top: var(--spacing-2); }
.pt-4 { padding-top: var(--spacing-4); }
.pt-6 { padding-top: var(--spacing-6); }
.pt-8 { padding-top: var(--spacing-8); }
.pt-10 { padding-top: var(--spacing-10); }

.pb-0 { padding-bottom: 0; }
.pb-2 { padding-bottom: var(--spacing-2); }
.pb-4 { padding-bottom: var(--spacing-4); }
.pb-6 { padding-bottom: var(--spacing-6); }
.pb-8 { padding-bottom: var(--spacing-8); }
.pb-10 { padding-bottom: var(--spacing-10); }

.px-0 { padding-left: 0; padding-right: 0; }
.px-2 { padding-left: var(--spacing-2); padding-right: var(--spacing-2); }
.px-4 { padding-left: var(--spacing-4); padding-right: var(--spacing-4); }
.px-6 { padding-left: var(--spacing-6); padding-right: var(--spacing-6); }

.py-0 { padding-top: 0; padding-bottom: 0; }
.py-2 { padding-top: var(--spacing-2); padding-bottom: var(--spacing-2); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }
.py-6 { padding-top: var(--spacing-6); padding-bottom: var(--spacing-6); }
.py-8 { padding-top: var(--spacing-8); padding-bottom: var(--spacing-8); }
.py-10 { padding-top: var(--spacing-10); padding-bottom: var(--spacing-10); }

/* ===================================================================
   12. UTILITY CLASSES - FLEXBOX
   =================================================================== */

.flex-row {
  flex-direction: row;
}

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

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

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

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

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

.justify-start {
  justify-content: flex-start;
}

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

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

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

.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

/* ===================================================================
   13. UTILITY CLASSES - BORDERS & SHADOWS
   =================================================================== */

.border {
  border: 1px solid var(--color-border-gray);
}

.border-top {
  border-top: 1px solid var(--color-border-gray);
}

.border-bottom {
  border-bottom: 1px solid var(--color-border-gray);
}

.border-l {
  border-left: 4px solid var(--color-primary);
}

.rounded {
  border-radius: var(--radius-base);
}

.rounded-md {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-xl {
  border-radius: var(--radius-xl);
}

.rounded-full {
  border-radius: var(--radius-full);
}

.shadow-none {
  box-shadow: var(--shadow-none);
}

.shadow-sm {
  box-shadow: var(--shadow-sm);
}

.shadow {
  box-shadow: var(--shadow-base);
}

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

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

.shadow-xl {
  box-shadow: var(--shadow-xl);
}

/* ===================================================================
   14. UTILITY CLASSES - COLORS & BACKGROUNDS
   =================================================================== */

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

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

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

.bg-secondary {
  background-color: var(--bg-secondary);
}

.bg-tertiary {
  background-color: var(--bg-tertiary);
}

.bg-white {
  background-color: var(--color-white);
}

/* ===================================================================
   15. UTILITY CLASSES - SIZING
   =================================================================== */

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

.max-w-full {
  max-width: 100%;
}

.max-w-container {
  max-width: var(--container-width);
}

.aspect-video {
  aspect-ratio: 16 / 9;
}

.aspect-square {
  aspect-ratio: 1 / 1;
}

/* ===================================================================
   16. FORM ELEMENTS - RESET & BASE STYLES
   =================================================================== */

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

input,
select,
textarea {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  border: 1px solid var(--color-border-gray);
  border-radius: var(--radius-base);
  background-color: var(--bg-primary);
  transition: border-color var(--transition-base),
              box-shadow var(--transition-base);
  
  &:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(255, 31, 142, 0.1);
  }
  
  &:disabled {
    background-color: var(--bg-secondary);
    cursor: not-allowed;
    opacity: 0.6;
  }
}

textarea {
  resize: vertical;
  min-height: 100px;
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath fill='%23333' d='M9.293 12.95l.707.707L15.657 8l-1.414-1.414L10 10.828 5.757 6.586 4.343 8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

label {
  display: block;
  margin-bottom: var(--spacing-2);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

/* ===================================================================
   17. BUTTON BASE STYLES
   =================================================================== */

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  outline: none;
  position: relative;
  overflow: hidden;
  
  &:disabled,
  &.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
  }
  
  &:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }
  
  i {
    margin-left: var(--spacing-2);
    
    &:first-child {
      margin-left: 0;
      margin-right: var(--spacing-2);
    }
  }
}

/* Minimum touch target size */
.btn,
button,
a[role="button"],
input[type="button"],
input[type="submit"] {
  min-height: 44px;
  min-width: 44px;
}

/* ===================================================================
   18. SCROLLBAR STYLING
   =================================================================== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
  
  &:hover {
    background: var(--color-primary-dark);
  }
}

/* ===================================================================
   19. ACCESSIBILITY - FOCUS VISIBLE & SCREEN READER
   =================================================================== */

/* High contrast focus indicators */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Screen reader only content */
.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;
}

.sr-only-focusable:active,
.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* ===================================================================
   20. TRANSITIONS & ANIMATIONS
   =================================================================== */

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

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOutRight {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

@keyframes slideInUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes scaleUp {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn var(--transition-base);
}

.fade-out {
  animation: fadeOut var(--transition-base);
}

.slide-in-up {
  animation: slideInUp var(--transition-base);
}

.scale-up {
  animation: scaleUp var(--transition-base);
}

/* ===================================================================
   21. SELECTION & CURSOR STYLES
   =================================================================== */

::selection {
  background-color: rgba(166, 175, 189, 0.3);
  color: inherit;
}

::-moz-selection {
  background-color: rgba(166, 175, 189, 0.3);
  color: inherit;
}

a.disabled,
button:disabled {
  pointer-events: none;
}

/* ===================================================================
   22. 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 {
    max-width: 100% !important;
  }
  
  @page {
    margin: 0.5cm;
  }
}

/* ===================================================================
   23. BOOTSTRAP COMPATIBILITY LAYER
   =================================================================== */

/* Map Bootstrap class patterns to CSS custom properties */

.text-uppercase {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.text-capitalize {
  text-transform: capitalize;
}

.font-weight-light {
  font-weight: var(--font-weight-light);
}

.font-weight-normal {
  font-weight: var(--font-weight-normal);
}

.font-weight-bold {
  font-weight: var(--font-weight-bold);
}

.font-italic {
  font-style: italic;
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  line-height: 1.5;
}

/* ===================================================================
   24. TAILWIND CSS COMPATIBILITY
   =================================================================== */

/* Ensure no conflicts with Tailwind CSS classes */

.overflow-hidden {
  overflow: hidden;
}

.overflow-auto {
  overflow: auto;
}

.whitespace-nowrap {
  white-space: nowrap;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===================================================================
   25. MOBILE-FIRST RESPONSIVE UTILITIES
   =================================================================== */

/* Stack on mobile, arrange on larger screens */
.stack-md {
  display: flex;
  flex-direction: column;
  
  @media (min-width: 768px) {
    flex-direction: row;
    gap: var(--spacing-4);
  }
}

.stack-lg {
  display: flex;
  flex-direction: column;
  
  @media (min-width: 1024px) {
    flex-direction: row;
    gap: var(--spacing-6);
  }
}

/* Responsive grid columns */
.grid-cols-1 {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: var(--spacing-4);
}

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