/*
 * Modern CSS Framework
 * A comprehensive, responsive template with fluid typography,
 * utility classes, and modern layout components
 * BEM naming convention for components
 */

/* ============================================
   1. CUSTOMIZATION ZONE - CSS VARIABLES
   ============================================ */

:root {
  /* === COLOR PALETTE === */
  
  /* Primary Colors */
  --color-primary-50: #f0f4ff;
  --color-primary-100: #dbe4ff;
  --color-primary-200: #bac8ff;
  --color-primary-300: #91a7ff;
  --color-primary-400: #748ffc;
  --color-primary-500: #5c7cfa;
  --color-primary-600: #4c6ef5;
  --color-primary-700: #4263eb;
  --color-primary-800: #3b5bdb;
  --color-primary-900: #364fc7;
  
  /* Secondary Colors */
  --color-secondary-50: #fff0f6;
  --color-secondary-100: #ffdeeb;
  --color-secondary-200: #fcc2d7;
  --color-secondary-300: #faa2c1;
  --color-secondary-400: #f783ac;
  --color-secondary-500: #f06595;
  --color-secondary-600: #e64980;
  --color-secondary-700: #d6336c;
  --color-secondary-800: #c2255c;
  --color-secondary-900: #a61e4d;
  
  /* Accent Colors */
  --color-accent-50: #fff9db;
  --color-accent-100: #fff3bf;
  --color-accent-200: #ffec99;
  --color-accent-300: #ffe066;
  --color-accent-400: #ffd43b;
  --color-accent-500: #fcc419;
  --color-accent-600: #fab005;
  --color-accent-700: #f59f00;
  --color-accent-800: #f08c00;
  --color-accent-900: #e67700;
  
  /* Neutral/Surface Colors */
  --color-neutral-50: #f8f9fa;
  --color-neutral-100: #f1f3f5;
  --color-neutral-200: #e9ecef;
  --color-neutral-300: #dee2e6;
  --color-neutral-400: #ced4da;
  --color-neutral-500: #adb5bd;
  --color-neutral-600: #868e96;
  --color-neutral-700: #495057;
  --color-neutral-800: #343a40;
  --color-neutral-900: #212529;
  
  /* Semantic Colors */
  --color-success: #51cf66;
  --color-warning: #ff922b;
  --color-error: #ff6b6b;
  --color-info: #339af0;
  
  /* Surface & Background */
  --color-surface: #ffffff;
  --color-background: var(--color-neutral-50);
  --color-surface-elevated: #ffffff;
  --color-overlay: rgba(0, 0, 0, 0.5);
  
  /* Text Colors */
  --color-text-primary: var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-700);
  --color-text-tertiary: var(--color-neutral-600);
  --color-text-inverse: #ffffff;
  
  /* === TYPOGRAPHY === */
  
  /* Font Families */
  --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-secondary: 'Fraunces', Georgia, serif;
  --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
  
  /* Base Font Size (16px default) */
  --font-size-base: 1rem;
  
  /* Type Scale (Perfect Fourth - 1.333 ratio) */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-md: clamp(1.125rem, 1.05rem + 0.375vw, 1.25rem);
  --font-size-lg: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --font-size-xl: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
  --font-size-2xl: clamp(2rem, 1.75rem + 1.25vw, 2.75rem);
  --font-size-3xl: clamp(2.5rem, 2.1rem + 2vw, 3.75rem);
  --font-size-4xl: clamp(3rem, 2.5rem + 2.5vw, 5rem);
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Line Heights */
  --line-height-tight: 1.1;
  --line-height-snug: 1.3;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;
  
  /* Letter Spacing */
  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  --letter-spacing-wider: 0.05em;
  
  /* === SPACING SYSTEM === */
  
  /* Base unit: 0.25rem (4px) */
  --unit-1: clamp(0.25rem, 0.2rem + 0.25vw, 0.375rem);
  --unit-2: clamp(0.5rem, 0.45rem + 0.25vw, 0.625rem);
  --unit-3: clamp(0.75rem, 0.675rem + 0.375vw, 1rem);
  --unit-4: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
  --unit-5: clamp(1.5rem, 1.35rem + 0.75vw, 2rem);
  --unit-6: clamp(2rem, 1.8rem + 1vw, 2.5rem);
  --unit-7: clamp(2.5rem, 2.2rem + 1.5vw, 3.5rem);
  --unit-8: clamp(3rem, 2.6rem + 2vw, 4.5rem);
  --unit-9: clamp(4rem, 3.5rem + 2.5vw, 6rem);
  --unit-10: clamp(5rem, 4.25rem + 3.75vw, 8rem);
  
  /* === BORDERS === */
  
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  --border-radius-full: 9999px;
  
  --border-width-thin: 1px;
  --border-width-medium: 2px;
  --border-width-thick: 4px;
  
  /* === 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);
  
  /* === 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-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  
  /* === BREAKPOINTS (for reference in JS) === */
  
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
  :root {
    --color-surface: #1a1b1e;
    --color-background: #141517;
    --color-surface-elevated: #25262b;
    --color-overlay: rgba(0, 0, 0, 0.7);
    
    --color-text-primary: var(--color-neutral-50);
    --color-text-secondary: var(--color-neutral-300);
    --color-text-tertiary: var(--color-neutral-400);
    --color-text-inverse: var(--color-neutral-900);
  }
}

/* Manual Dark Mode Toggle */
[data-theme="dark"] {
  --color-surface: #1a1b1e;
  --color-background: #141517;
  --color-surface-elevated: #25262b;
  --color-overlay: rgba(0, 0, 0, 0.7);
  
  --color-text-primary: var(--color-neutral-50);
  --color-text-secondary: var(--color-neutral-300);
  --color-text-tertiary: var(--color-neutral-400);
  --color-text-inverse: var(--color-neutral-900);
}

/* ============================================
   2. GLOBAL RESET & BASE STYLES
   ============================================ */

/* Modern CSS Reset */
*,
*::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;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Typography Base Styles */

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

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
}

h2 {
  font-size: var(--font-size-3xl);
}

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-md);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

p {
  margin-bottom: var(--unit-4);
  color: var(--color-text-secondary);
  max-width: 65ch;
}

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

a:hover {
  color: var(--color-primary-700);
}

a:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

/* Link with underline effect */
a.link--underline {
  text-decoration: none;
  background-image: linear-gradient(to right, currentColor 0%, currentColor 100%);
  background-size: 0 2px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size var(--transition-base);
}

a.link--underline:hover {
  background-size: 100% 2px;
}

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

em, i {
  font-style: italic;
}

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

mark {
  background-color: var(--color-accent-200);
  color: var(--color-text-primary);
  padding: 0.125rem 0.25rem;
  border-radius: var(--border-radius-sm);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-neutral-100);
  padding: 0.125rem 0.375rem;
  border-radius: var(--border-radius-sm);
  color: var(--color-secondary-700);
}

pre {
  font-family: var(--font-mono);
  background-color: var(--color-neutral-100);
  padding: var(--unit-4);
  border-radius: var(--border-radius-md);
  overflow-x: auto;
  margin-bottom: var(--unit-4);
}

pre code {
  background: none;
  padding: 0;
}

blockquote {
  border-left: 4px solid var(--color-primary-500);
  padding-left: var(--unit-4);
  margin: var(--unit-5) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

hr {
  border: none;
  border-top: var(--border-width-thin) solid var(--color-neutral-300);
  margin: var(--unit-6) 0;
}

/* Lists */

ul, ol {
  margin-bottom: var(--unit-4);
  padding-left: var(--unit-5);
}

ul {
  list-style-type: disc;
}

ol {
  list-style-type: decimal;
}

li {
  margin-bottom: var(--unit-2);
  color: var(--color-text-secondary);
}

li::marker {
  color: var(--color-primary-500);
}

/* Remove list styling for utility */
.list-none {
  list-style: none;
  padding-left: 0;
}

/* Form Elements */

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

input,
textarea,
select {
  width: 100%;
  padding: var(--unit-3) var(--unit-4);
  border: var(--border-width-thin) solid var(--color-neutral-300);
  border-radius: var(--border-radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(92, 124, 250, 0.1);
}

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

input[disabled],
textarea[disabled],
select[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

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

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

/* Button Base Styles */

button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--unit-2);
  padding: var(--unit-3) var(--unit-5);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

button:disabled,
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Variants */

.btn--primary {
  background-color: var(--color-primary-600);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background-color: var(--color-primary-700);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--secondary {
  background-color: var(--color-secondary-600);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
  background-color: var(--color-secondary-700);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary-600);
  border: var(--border-width-medium) solid var(--color-primary-600);
}

.btn--outline:hover {
  background-color: var(--color-primary-50);
  transform: translateY(-1px);
}

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

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

/* Button Sizes */

.btn--sm {
  padding: var(--unit-2) var(--unit-3);
  font-size: var(--font-size-sm);
}

.btn--lg {
  padding: var(--unit-4) var(--unit-6);
  font-size: var(--font-size-lg);
}

/* Media Elements */

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

img {
  border-radius: var(--border-radius-md);
}

figure {
  margin: var(--unit-6) 0;
}

figcaption {
  margin-top: var(--unit-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  text-align: center;
}

/* Responsive video container */
.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  border-radius: var(--border-radius-lg);
}

.video-container iframe,
.video-container video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Table Styles */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--unit-5);
}

thead {
  background-color: var(--color-neutral-100);
}

th {
  padding: var(--unit-3) var(--unit-4);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  border-bottom: var(--border-width-medium) solid var(--color-neutral-300);
}

td {
  padding: var(--unit-3) var(--unit-4);
  border-bottom: var(--border-width-thin) solid var(--color-neutral-200);
  color: var(--color-text-secondary);
}

tr:hover {
  background-color: var(--color-neutral-50);
}

/* ============================================
   3. RESPONSIVE CONFIGURATION
   ============================================ */

/* Container */

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--unit-4);
}

.container--narrow {
  max-width: 768px;
}

.container--wide {
  max-width: 1536px;
}

.container--fluid {
  max-width: 100%;
}

/* 12-Column Grid System */

.grid {
  display: grid;
  gap: var(--unit-5);
}

/* Grid Column Classes */
.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)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-7 { grid-template-columns: repeat(7, minmax(0, 1fr)); }
.grid-cols-8 { grid-template-columns: repeat(8, minmax(0, 1fr)); }
.grid-cols-9 { grid-template-columns: repeat(9, minmax(0, 1fr)); }
.grid-cols-10 { grid-template-columns: repeat(10, minmax(0, 1fr)); }
.grid-cols-11 { grid-template-columns: repeat(11, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* Grid Column Span */
.col-span-1 { grid-column: span 1 / span 1; }
.col-span-2 { grid-column: span 2 / span 2; }
.col-span-3 { grid-column: span 3 / span 3; }
.col-span-4 { grid-column: span 4 / span 4; }
.col-span-5 { grid-column: span 5 / span 5; }
.col-span-6 { grid-column: span 6 / span 6; }
.col-span-7 { grid-column: span 7 / span 7; }
.col-span-8 { grid-column: span 8 / span 8; }
.col-span-9 { grid-column: span 9 / span 9; }
.col-span-10 { grid-column: span 10 / span 10; }
.col-span-11 { grid-column: span 11 / span 11; }
.col-span-12 { grid-column: span 12 / span 12; }
.col-span-full { grid-column: 1 / -1; }

/* Gap Utilities */
.gap-0 { gap: 0; }
.gap-1 { gap: var(--unit-1); }
.gap-2 { gap: var(--unit-2); }
.gap-3 { gap: var(--unit-3); }
.gap-4 { gap: var(--unit-4); }
.gap-5 { gap: var(--unit-5); }
.gap-6 { gap: var(--unit-6); }
.gap-7 { gap: var(--unit-7); }
.gap-8 { gap: var(--unit-8); }

/* Flexbox Utilities */

.flex {
  display: flex;
}

.inline-flex {
  display: inline-flex;
}

/* Flex Direction */
.flex-row { flex-direction: row; }
.flex-row-reverse { flex-direction: row-reverse; }
.flex-col { flex-direction: column; }
.flex-col-reverse { flex-direction: column-reverse; }

/* Flex Wrap */
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }
.flex-wrap-reverse { flex-wrap: wrap-reverse; }

/* Justify Content */
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }
.justify-evenly { justify-content: space-evenly; }

/* Align Items */
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.items-center { align-items: center; }
.items-baseline { align-items: baseline; }
.items-stretch { align-items: stretch; }

/* Align Content */
.content-start { align-content: flex-start; }
.content-end { align-content: flex-end; }
.content-center { align-content: center; }
.content-between { align-content: space-between; }
.content-around { align-content: space-around; }
.content-evenly { align-content: space-evenly; }

/* Flex Grow & Shrink */
.flex-1 { flex: 1 1 0%; }
.flex-auto { flex: 1 1 auto; }
.flex-initial { flex: 0 1 auto; }
.flex-none { flex: none; }

/* Spacing Utilities */

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

/* Margin Top */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--unit-1); }
.mt-2 { margin-top: var(--unit-2); }
.mt-3 { margin-top: var(--unit-3); }
.mt-4 { margin-top: var(--unit-4); }
.mt-5 { margin-top: var(--unit-5); }
.mt-6 { margin-top: var(--unit-6); }
.mt-7 { margin-top: var(--unit-7); }
.mt-8 { margin-top: var(--unit-8); }

/* Margin Bottom */
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--unit-1); }
.mb-2 { margin-bottom: var(--unit-2); }
.mb-3 { margin-bottom: var(--unit-3); }
.mb-4 { margin-bottom: var(--unit-4); }
.mb-5 { margin-bottom: var(--unit-5); }
.mb-6 { margin-bottom: var(--unit-6); }
.mb-7 { margin-bottom: var(--unit-7); }
.mb-8 { margin-bottom: var(--unit-8); }

/* Margin Left/Right */
.mx-auto { margin-left: auto; margin-right: auto; }
.my-0 { margin-top: 0; margin-bottom: 0; }
.my-5 { margin-top: var(--unit-5); margin-bottom: var(--unit-5); }
.my-6 { margin-top: var(--unit-6); margin-bottom: var(--unit-6); }

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

/* Padding Top/Bottom */
.py-0 { padding-top: 0; padding-bottom: 0; }
.py-5 { padding-top: var(--unit-5); padding-bottom: var(--unit-5); }
.py-6 { padding-top: var(--unit-6); padding-bottom: var(--unit-6); }
.py-8 { padding-top: var(--unit-8); padding-bottom: var(--unit-8); }
.py-10 { padding-top: var(--unit-10); padding-bottom: var(--unit-10); }

/* Padding Left/Right */
.px-0 { padding-left: 0; padding-right: 0; }
.px-4 { padding-left: var(--unit-4); padding-right: var(--unit-4); }
.px-5 { padding-left: var(--unit-5); padding-right: var(--unit-5); }
.px-6 { padding-left: var(--unit-6); padding-right: var(--unit-6); }

/* Display Utilities */
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }
.hidden { display: none; }

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

/* Text Transform */
.uppercase { text-transform: uppercase; }
.lowercase { text-transform: lowercase; }
.capitalize { text-transform: capitalize; }

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

/* Color Utilities */
.text-primary { color: var(--color-primary-600); }
.text-secondary { color: var(--color-secondary-600); }
.text-accent { color: var(--color-accent-600); }
.text-muted { color: var(--color-text-tertiary); }

.bg-primary { background-color: var(--color-primary-600); }
.bg-secondary { background-color: var(--color-secondary-600); }
.bg-accent { background-color: var(--color-accent-500); }
.bg-surface { background-color: var(--color-surface); }
.bg-neutral { background-color: var(--color-neutral-100); }

/* Border Radius */
.rounded-none { border-radius: 0; }
.rounded-sm { border-radius: var(--border-radius-sm); }
.rounded-md { border-radius: var(--border-radius-md); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-xl { border-radius: var(--border-radius-xl); }
.rounded-full { border-radius: var(--border-radius-full); }

/* Shadow Utilities */
.shadow-none { box-shadow: none; }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Width Utilities */
.w-full { width: 100%; }
.w-auto { width: auto; }
.w-screen { width: 100vw; }

/* Max Width */
.max-w-xs { max-width: 320px; }
.max-w-sm { max-width: 480px; }
.max-w-md { max-width: 640px; }
.max-w-lg { max-width: 768px; }
.max-w-xl { max-width: 1024px; }
.max-w-2xl { max-width: 1280px; }
.max-w-full { max-width: 100%; }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* Overflow */
.overflow-auto { overflow: auto; }
.overflow-hidden { overflow: hidden; }
.overflow-scroll { overflow: scroll; }

/* ============================================
   4. MODERN LAYOUT COMPONENTS
   ============================================ */

/* === NAVIGATION BAR === */

.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-surface);
  border-bottom: var(--border-width-thin) solid var(--color-neutral-200);
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
  transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
  background-color: rgba(26, 27, 30, 0.95);
}

.navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--unit-4) var(--unit-5);
  max-width: 1280px;
  margin: 0 auto;
  gap: var(--unit-4);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--unit-3);
  font-family: var(--font-secondary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-decoration: none;
}

.navbar__logo {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-md);
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--unit-6);
  list-style: none;
  padding: 0;
  margin: 0;
}

.navbar__right-controls {
  display: flex;
  align-items: center;
  gap: var(--unit-3);
}

.navbar__link {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  position: relative;
}

.navbar__link:hover {
  color: var(--color-primary-600);
}

.navbar__link--active {
  color: var(--color-primary-600);
}

.navbar__link--active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary-600);
  border-radius: var(--border-radius-full);
}

.navbar__cta {
  margin-left: var(--unit-4);
}

/* Mobile Menu Toggle */
.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  padding: var(--unit-2);
  cursor: pointer;
}

.navbar__toggle-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

/* === HERO SECTION === */

.hero {
  position: relative;
  padding: var(--unit-10) 0;
  overflow: hidden;
}

.hero--gradient {
  background: linear-gradient(135deg, 
    var(--color-primary-50) 0%, 
    var(--color-secondary-50) 50%,
    var(--color-accent-50) 100%
  );
}

.hero__container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--unit-5);
}

.hero__content {
  max-width: 768px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  display: inline-block;
  padding: var(--unit-2) var(--unit-4);
  background-color: var(--color-primary-50);
  color: var(--color-primary-700);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
  border-radius: var(--border-radius-full);
  margin-bottom: var(--unit-5);
  animation: fadeInUp 0.6s ease-out;
}

.hero__title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--unit-5);
  animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--unit-6);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero__actions {
  display: flex;
  gap: var(--unit-4);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero__image {
  margin-top: var(--unit-8);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-2xl);
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Hero Background Pattern */
.hero__pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.1;
  background-image: 
    radial-gradient(circle at 25px 25px, var(--color-primary-300) 2%, transparent 0%),
    radial-gradient(circle at 75px 75px, var(--color-secondary-300) 2%, transparent 0%);
  background-size: 100px 100px;
}

/* === CARD COMPONENT === */

.card {
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-base);
  border: var(--border-width-thin) solid var(--color-neutral-200);
}

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

.card__image {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.card__content {
  padding: var(--unit-5);
}

.card__eyebrow {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
  color: var(--color-primary-600);
  margin-bottom: var(--unit-2);
}

.card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--unit-3);
  color: var(--color-text-primary);
}

.card__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--unit-4);
  line-height: var(--line-height-relaxed);
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--unit-4);
  border-top: var(--border-width-thin) solid var(--color-neutral-200);
}

.card__meta {
  display: flex;
  align-items: center;
  gap: var(--unit-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.card__link {
  color: var(--color-primary-600);
  font-weight: var(--font-weight-semibold);
  display: inline-flex;
  align-items: center;
  gap: var(--unit-2);
  transition: gap var(--transition-fast);
}

.card__link:hover {
  gap: var(--unit-3);
}

/* Card Variants */
.card--horizontal {
  display: flex;
  flex-direction: row;
}

.card--horizontal .card__image {
  width: 40%;
  height: auto;
}

.card--featured {
  background: linear-gradient(135deg, 
    var(--color-primary-600), 
    var(--color-secondary-600)
  );
  color: var(--color-text-inverse);
}

.card--featured .card__title,
.card--featured .card__description,
.card--featured .card__eyebrow {
  color: var(--color-text-inverse);
}

/* === FOOTER === */

.footer {
  background-color: var(--color-neutral-900);
  color: var(--color-neutral-300);
  padding: var(--unit-8) 0 var(--unit-5);
  margin-top: var(--unit-10);
}

.footer__container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--unit-5);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--unit-7);
  margin-bottom: var(--unit-8);
}

.footer__brand {
  grid-column: span 1;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--unit-3);
  font-family: var(--font-secondary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin-bottom: var(--unit-4);
}

.footer__tagline {
  color: var(--color-neutral-400);
  margin-bottom: var(--unit-5);
  max-width: 300px;
}

.footer__social {
  display: flex;
  gap: var(--unit-3);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-md);
  background-color: var(--color-neutral-800);
  color: var(--color-neutral-300);
  transition: all var(--transition-fast);
}

.footer__social-link:hover {
  background-color: var(--color-primary-600);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
}

.footer__section-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-inverse);
  margin-bottom: var(--unit-4);
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__link-item {
  margin-bottom: var(--unit-3);
}

.footer__link {
  color: var(--color-neutral-400);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-text-inverse);
}

.footer__bottom {
  padding-top: var(--unit-5);
  border-top: var(--border-width-thin) solid var(--color-neutral-800);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--unit-4);
}

.footer__copyright {
  color: var(--color-neutral-500);
  font-size: var(--font-size-sm);
}

.footer__legal {
  display: flex;
  gap: var(--unit-5);
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__legal-link {
  color: var(--color-neutral-500);
  font-size: var(--font-size-sm);
}

.footer__legal-link:hover {
  color: var(--color-text-inverse);
}

/* === ANIMATIONS === */

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

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

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

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* ============================================
   5. RESPONSIVE BREAKPOINTS
   ============================================ */

/* Mobile First - Base styles above are for mobile */

/* Small devices (landscape phones, 640px and up) */
@media (max-width: 639px) {
  .navbar__menu {
    display: none;
  }
  
  .navbar__toggle {
    display: flex;
  }
  
  .navbar__menu--open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-surface);
    padding: var(--unit-5);
    box-shadow: var(--shadow-lg);
    gap: var(--unit-4);
  }
  
  .card--horizontal {
    flex-direction: column;
  }
  
  .card--horizontal .card__image {
    width: 100%;
    height: 240px;
  }
}

/* Tablet (768px and up) */
@media (min-width: 768px) {
  .grid-md-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-md-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-md-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  
  .col-md-span-6 { grid-column: span 6 / span 6; }
  .col-md-span-8 { grid-column: span 8 / span 8; }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
  .grid-lg-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-lg-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  
  .col-lg-span-4 { grid-column: span 4 / span 4; }
  .col-lg-span-8 { grid-column: span 8 / span 8; }
}

/* Ultra-wide (1536px and up) */
@media (min-width: 1536px) {
  .container {
    max-width: 1536px;
  }
}

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

.accessibility-menu {
  position: fixed;
  top: var(--unit-6);
  right: var(--unit-5);
  z-index: var(--z-popover);
}

.accessibility-menu__toggle {
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius-full);
  background-color: var(--color-primary-600);
  color: var(--color-text-inverse);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
  font-size: 24px;
}

.accessibility-menu__toggle:hover {
  background-color: var(--color-primary-700);
  transform: scale(1.05);
}

.accessibility-menu__toggle:focus-visible {
  outline: 3px solid var(--color-accent-500);
  outline-offset: 3px;
}

.accessibility-menu__panel {
  position: absolute;
  top: 70px;
  right: 0;
  width: 320px;
  background-color: var(--color-surface);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-2xl);
  padding: var(--unit-5);
  display: none;
  border: var(--border-width-thin) solid var(--color-neutral-200);
}

.accessibility-menu__panel--open {
  display: block;
  animation: slideInRight 0.3s ease-out;
}

.accessibility-menu__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--unit-4);
  color: var(--color-text-primary);
}

.accessibility-menu__section {
  margin-bottom: var(--unit-5);
  padding-bottom: var(--unit-4);
  border-bottom: var(--border-width-thin) solid var(--color-neutral-200);
}

.accessibility-menu__section:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.accessibility-menu__label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--unit-3);
  color: var(--color-text-primary);
}

.accessibility-menu__controls {
  display: flex;
  gap: var(--unit-2);
  align-items: center;
}

.accessibility-menu__button {
  flex: 1;
  padding: var(--unit-2) var(--unit-3);
  background-color: var(--color-neutral-100);
  border: var(--border-width-thin) solid var(--color-neutral-300);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.accessibility-menu__button:hover {
  background-color: var(--color-neutral-200);
  border-color: var(--color-neutral-400);
}

.accessibility-menu__button--active {
  background-color: var(--color-primary-600);
  color: var(--color-text-inverse);
  border-color: var(--color-primary-600);
}

.accessibility-menu__toggle-switch {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.accessibility-menu__switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 24px;
}

.accessibility-menu__switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.accessibility-menu__slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-neutral-300);
  transition: var(--transition-base);
  border-radius: var(--border-radius-full);
}

.accessibility-menu__slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: var(--transition-base);
  border-radius: var(--border-radius-full);
}

.accessibility-menu__switch input:checked + .accessibility-menu__slider {
  background-color: var(--color-primary-600);
}

.accessibility-menu__switch input:checked + .accessibility-menu__slider:before {
  transform: translateX(24px);
}

.accessibility-menu__switch input:focus-visible + .accessibility-menu__slider {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Font Size Adjustments */
[data-font-size="small"] {
  --font-size-base: clamp(0.875rem, 0.825rem + 0.25vw, 1rem);
  --font-size-sm: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-md: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1.05rem + 0.375vw, 1.375rem);
  --font-size-xl: clamp(1.375rem, 1.25rem + 0.625vw, 1.875rem);
  --font-size-2xl: clamp(1.75rem, 1.5rem + 1.25vw, 2.5rem);
  --font-size-3xl: clamp(2.25rem, 1.9rem + 1.75vw, 3.25rem);
  --font-size-4xl: clamp(2.75rem, 2.25rem + 2.5vw, 4.5rem);
}

[data-font-size="large"] {
  --font-size-base: clamp(1.125rem, 1.075rem + 0.25vw, 1.25rem);
  --font-size-sm: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-md: clamp(1.25rem, 1.175rem + 0.375vw, 1.5rem);
  --font-size-lg: clamp(1.5rem, 1.4rem + 0.5vw, 1.875rem);
  --font-size-xl: clamp(1.875rem, 1.7rem + 0.875vw, 2.5rem);
  --font-size-2xl: clamp(2.5rem, 2.2rem + 1.5vw, 3.5rem);
  --font-size-3xl: clamp(3.25rem, 2.75rem + 2.5vw, 4.75rem);
  --font-size-4xl: clamp(4rem, 3.25rem + 3.75vw, 6.5rem);
}

/* High Contrast Mode */
[data-contrast="high"] {
  --color-text-primary: #000000;
  --color-text-secondary: #1a1a1a;
  --color-background: #ffffff;
  --color-surface: #ffffff;
  --color-neutral-100: #f0f0f0;
  --color-neutral-200: #e0e0e0;
  --color-neutral-300: #cccccc;
  --color-primary-600: #0000ee;
  --color-secondary-600: #cc0000;
}

[data-contrast="high"][data-theme="dark"] {
  --color-text-primary: #ffffff;
  --color-text-secondary: #e0e0e0;
  --color-background: #000000;
  --color-surface: #1a1a1a;
  --color-neutral-800: #2a2a2a;
  --color-primary-600: #66aaff;
}

/* Reduced Motion */
@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;
  }
}

[data-motion="reduced"] *,
[data-motion="reduced"] *::before,
[data-motion="reduced"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

/* Underline All Links */
[data-underline-links="true"] a {
  text-decoration: underline;
}

/* Dark Mode Toggle in Navbar */
.navbar__theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-md);
  background-color: transparent;
  border: var(--border-width-thin) solid var(--color-neutral-300);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 20px;
}

.navbar__theme-toggle:hover {
  background-color: var(--color-neutral-100);
  border-color: var(--color-neutral-400);
}

.navbar__theme-toggle:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* ============================================
   6. UTILITY & HELPER CLASSES
   ============================================ */

/* Visibility */
.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 visible styles */
*:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Smooth scrolling for anchor links */
html {
  scroll-padding-top: 80px;
}

/* Selection color */
::selection {
  background-color: var(--color-primary-200);
  color: var(--color-text-primary);
}

/* Print styles */
@media print {
  .navbar,
  .footer,
  .btn,
  button {
    display: none !important;
  }
  
  * {
    background: white !important;
    color: black !important;
  }
}