/* ==================== WEB OCEAN - BASE CSS ==================== */
/* TechStudio - Professional Design System */
/* Mobile-First | SEO-Optimized | Modular Architecture */
/* Version: 2.0 | Last Updated: 2025 */

/* ==================== TABLE OF CONTENTS ====================
 * 1. CSS Reset & Base Styles
 * 2. CSS Custom Properties (Variables)
 * 3. Typography System
 * 4. Layout & Container System
 * 5. Component Styles
 * 6. Utility Classes
 * 7. Animation & Transitions
 * 8. Responsive Design
 * 9. Accessibility
 ========================================================== */

/* ==================== 1. CSS RESET & BASE STYLES ==================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #1a1a2e;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ==================== 2. CSS CUSTOM PROPERTIES ==================== */
:root {
  /* Color System */
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-primary-light: #818cf8;
  --color-secondary: #8b5cf6;
  --color-accent: #22d3ee;
  
  /* Neutral Colors */
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a4a68;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  
  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  
  /* Spacing Scale */
  --spacing-xs: 0.25rem;    /* 4px */
  --spacing-sm: 0.5rem;     /* 8px */
  --spacing-md: 1rem;       /* 16px */
  --spacing-lg: 1.5rem;     /* 24px */
  --spacing-xl: 2rem;       /* 32px */
  --spacing-2xl: 3rem;      /* 48px */
  --spacing-3xl: 4rem;      /* 64px */
  --spacing-4xl: 5rem;      /* 80px */
  
  /* Typography Scale */
  --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 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: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  --line-height-loose: 2;
  
  /* Border Radius */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;
  
  /* 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: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms 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;
}

/* ==================== 3. TYPOGRAPHY SYSTEM ==================== */

/* Headings - Fluid Typography with Optimal Scaling */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.75rem, 4vw + 0.5rem, 2.75rem);
  font-weight: var(--font-weight-bold);
}

h3 {
  font-size: clamp(1.5rem, 3vw + 0.25rem, 2rem);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: var(--font-weight-semibold);
}

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

h6 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Paragraph & Text Elements */
p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

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

.lead {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

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

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

em, i {
  font-style: italic;
}

/* Links */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

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

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

/* Lists */
ul, ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}

img[loading="lazy"] {
  background: var(--color-bg-tertiary);
}

/* Blockquote */
blockquote {
  padding: var(--spacing-lg) var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  border-left: 4px solid var(--color-primary);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  font-style: italic;
  color: var(--color-text-secondary);
}

/* Code */
code {
  padding: 0.125rem 0.375rem;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.875em;
  color: var(--color-primary);
}

pre {
  padding: var(--spacing-lg);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
}

pre code {
  padding: 0;
  background: none;
  border-radius: 0;
}

/* ==================== 4. LAYOUT & CONTAINER SYSTEM ==================== */

/* Container System - Responsive & Flexible */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-sm {
  max-width: 900px;
}

.container-md {
  max-width: 1000px;
}

.container-lg {
  max-width: 1400px;
}

.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-lg);
  max-width: 100%;
}

/* Section Spacing - Consistent Vertical Rhythm */
.section {
  padding: var(--spacing-4xl) 0;
  position: relative;
}

.section-sm {
  padding: var(--spacing-3xl) 0;
}

.section-lg {
  padding: 6rem 0;
}

.section-xl {
  padding: 8rem 0;
}

/* Section Backgrounds */
.section-alt {
  background: var(--color-bg-secondary);
}

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

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

/* Responsive Padding Adjustments */
@media (max-width: 768px) {
  .container,
  .container-fluid {
    padding: 0 var(--spacing-md);
  }
  
  .section {
    padding: var(--spacing-3xl) 0;
  }
  
  .section-sm {
    padding: var(--spacing-2xl) 0;
  }
  
  .section-lg {
    padding: var(--spacing-4xl) 0;
  }
}

/* Section Headers - Enhanced Typography */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-3xl);
}

.section-badge {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all var(--transition-base);
}

.section-badge:hover {
  background: rgba(99, 102, 241, 0.15);
  transform: translateY(-1px);
}

.section-title {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  max-width: 600px;
  margin: 0 auto;
}

/* ==================== 5. COMPONENT STYLES ==================== */

/* Buttons - Professional & Accessible */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.875rem 1.75rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:active {
  transform: scale(0.98);
}

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

/* Button Variants */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-bg-primary);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-bg-primary);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: none;
}

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

/* Button Sizes */
.btn-sm {
  padding: 0.625rem 1.25rem;
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: 1.125rem 2.25rem;
  font-size: var(--font-size-lg);
}

.btn-xl {
  padding: 1.375rem 2.75rem;
  font-size: var(--font-size-xl);
}

.btn-block {
  width: 100%;
  display: flex;
}

.btn-icon {
  padding: 0.875rem;
  aspect-ratio: 1;
}

/* Button States */
.btn:disabled,
.btn.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-right-color: transparent;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Cards - Modern & Flexible */
.card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

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

.card-elevated:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

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

.card-bordered:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.card-interactive {
  cursor: pointer;
  user-select: none;
}

.card-interactive:active {
  transform: scale(0.98);
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.card-body {
  padding: var(--spacing-lg);
  flex: 1;
}

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border-light);
  background: var(--color-bg-secondary);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-img-top {
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

/* Card Variants */
.card-glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

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

/* Grid System - Responsive & Flexible */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

/* Auto-fit Grid - Responsive without media queries */
.grid-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-auto-fill {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

/* Grid Gap Variations */
.grid-gap-sm { gap: var(--spacing-sm); }
.grid-gap-md { gap: var(--spacing-md); }
.grid-gap-lg { gap: var(--spacing-lg); }
.grid-gap-xl { gap: var(--spacing-xl); }

/* Responsive Grid Breakpoints */
@media (max-width: 1200px) {
  .grid-6 { grid-template-columns: repeat(4, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-6,
  .grid-5,
  .grid-4,
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 576px) {
  .grid-6,
  .grid-5,
  .grid-4,
  .grid-3,
  .grid-2 { grid-template-columns: 1fr; }
  
  .grid { gap: var(--spacing-md); }
}

/* Flexbox Utilities */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.gap-4 { gap: 32px; }

/* Text Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: #6366f1; }
.text-secondary { color: #6b7280; }
.text-white { color: #fff; }
.text-dark { color: #1a1a2e; }

/* Background Utilities */
.bg-white { background: var(--color-bg-primary); }
.bg-light { background: var(--color-bg-secondary); }
.bg-gray { background: var(--color-bg-tertiary); }
.bg-dark { background: var(--color-text-primary); }
.bg-primary { background: var(--color-primary); }
.bg-secondary { background: var(--color-secondary); }
.bg-gradient { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%); }
.bg-gradient-radial { background: radial-gradient(circle at top right, var(--color-primary) 0%, var(--color-secondary) 100%); }

/* Opacity Utilities */
.opacity-0 { opacity: 0; }
.opacity-25 { opacity: 0.25; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* Display Utilities */
.d-none { display: none; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

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

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

/* Width & Height Utilities */
.w-100 { width: 100%; }
.w-auto { width: auto; }
.h-100 { height: 100%; }
.h-auto { height: auto; }

/* Border Radius Utilities */
.rounded-sm { border-radius: var(--radius-sm); }
.rounded { 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); }
.rounded-none { border-radius: 0; }

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

/* Cursor Utilities */
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }
.cursor-default { cursor: default; }

/* User Select */
.select-none { user-select: none; }
.select-all { user-select: all; }
.select-auto { user-select: auto; }

/* ==================== 6. UTILITY CLASSES ==================== */

/* Spacing Utilities - Comprehensive System */
.m-0 { margin: 0; }
.m-1 { margin: var(--spacing-sm); }
.m-2 { margin: var(--spacing-md); }
.m-3 { margin: var(--spacing-lg); }
.m-4 { margin: var(--spacing-xl); }
.m-5 { margin: var(--spacing-2xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-2xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-2xl); }

.ml-0 { margin-left: 0; }
.ml-1 { margin-left: var(--spacing-sm); }
.ml-2 { margin-left: var(--spacing-md); }
.ml-3 { margin-left: var(--spacing-lg); }

.mr-0 { margin-right: 0; }
.mr-1 { margin-right: var(--spacing-sm); }
.mr-2 { margin-right: var(--spacing-md); }
.mr-3 { margin-right: var(--spacing-lg); }

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

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }
.p-5 { padding: var(--spacing-2xl); }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: var(--spacing-sm); }
.pt-2 { padding-top: var(--spacing-md); }
.pt-3 { padding-top: var(--spacing-lg); }
.pt-4 { padding-top: var(--spacing-xl); }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: var(--spacing-sm); }
.pb-2 { padding-bottom: var(--spacing-md); }
.pb-3 { padding-bottom: var(--spacing-lg); }
.pb-4 { padding-bottom: var(--spacing-xl); }

.px-0 { padding-left: 0; padding-right: 0; }
.px-1 { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-2 { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-3 { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }

.py-0 { padding-top: 0; padding-bottom: 0; }
.py-1 { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-2 { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-3 { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }

/* Form Elements - Enhanced UX */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  letter-spacing: 0.01em;
}

.form-label-required::after {
  content: ' *';
  color: #ef4444;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: var(--font-size-base);
  font-family: inherit;
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.form-input:hover,
.form-textarea:hover,
.form-select:hover {
  border-color: var(--color-primary-light);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.form-textarea {
  min-height: 120px;
  resize: vertical;
  font-family: inherit;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

/* Form Validation States */
.form-input.is-valid,
.form-textarea.is-valid,
.form-select.is-valid {
  border-color: #10b981;
}

.form-input.is-invalid,
.form-textarea.is-invalid,
.form-select.is-invalid {
  border-color: #ef4444;
}

.form-feedback {
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.form-feedback-valid {
  color: #10b981;
}

.form-feedback-invalid {
  color: #ef4444;
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.form-check-input {
  width: 1.25rem;
  height: 1.25rem;
  cursor: pointer;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.form-check-input:checked {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.form-check-label {
  cursor: pointer;
  user-select: none;
  font-size: var(--font-size-sm);
}

/* Form Row */
.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

@media (max-width: 768px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

/* Badge System */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.badge-primary {
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
}

.badge-secondary {
  background: rgba(139, 92, 246, 0.1);
  color: var(--color-secondary);
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.badge-info {
  background: rgba(34, 211, 238, 0.1);
  color: var(--color-accent);
}

.badge-lg {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* Icon System */
.icon {
  width: 1.5rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.icon-sm {
  width: 1rem;
  height: 1rem;
}

.icon-lg {
  width: 2rem;
  height: 2rem;
}

.icon-xl {
  width: 3rem;
  height: 3rem;
}

.icon-box {
  width: 3.75rem;
  height: 3.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  font-size: 1.75rem;
  background: var(--color-bg-secondary);
  transition: all var(--transition-base);
}

.icon-box-primary {
  background: rgba(99, 102, 241, 0.1);
  color: var(--color-primary);
}

.icon-box-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-bg-primary);
}

.icon-box:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md);
}

/* ==================== 7. ANIMATION & TRANSITIONS ==================== */

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

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

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

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

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

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

/* Animation Classes */
.animate-fadeIn { animation: fadeIn 0.6s ease forwards; }
.animate-fadeInUp { animation: fadeInUp 0.6s ease forwards; }
.animate-fadeInDown { animation: fadeInDown 0.6s ease forwards; }
.animate-slideInLeft { animation: slideInLeft 0.6s ease forwards; }
.animate-slideInRight { animation: slideInRight 0.6s ease forwards; }
.animate-scaleIn { animation: scaleIn 0.6s ease forwards; }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }

/* Transition Utilities */
.transition-all { transition: all var(--transition-base); }
.transition-colors { transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base); }
.transition-transform { transition: transform var(--transition-base); }
.transition-opacity { transition: opacity var(--transition-base); }

/* Hover Effects */
.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-rotate:hover {
  transform: rotate(5deg);
}

.hover-glow:hover {
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
}

/* Scroll Animations - AOS Integration */
[data-aos] {
  opacity: 0;
  transition-property: opacity, transform;
  transition-duration: 0.6s;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-aos].aos-animate {
  opacity: 1;
}

[data-aos="fade-up"] {
  transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
  transform: translateY(0);
}

[data-aos="fade-down"] {
  transform: translateY(-30px);
}

[data-aos="fade-down"].aos-animate {
  transform: translateY(0);
}

[data-aos="fade-left"] {
  transform: translateX(30px);
}

[data-aos="fade-left"].aos-animate {
  transform: translateX(0);
}

[data-aos="fade-right"] {
  transform: translateX(-30px);
}

[data-aos="fade-right"].aos-animate {
  transform: translateX(0);
}

[data-aos="zoom-in"] {
  transform: scale(0.9);
}

[data-aos="zoom-in"].aos-animate {
  transform: scale(1);
}

/* Loading States */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 0%,
    var(--color-bg-secondary) 50%,
    var(--color-bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-bg-tertiary);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ==================== 8. RESPONSIVE DESIGN ==================== */

/* Breakpoint System */
/* xs: 0-575px (Mobile) */
/* sm: 576-767px (Mobile Landscape) */
/* md: 768-991px (Tablet) */
/* lg: 992-1199px (Desktop) */
/* xl: 1200px+ (Large Desktop) */

/* Responsive Visibility Utilities */
@media (max-width: 575px) {
  .hide-xs { display: none !important; }
}

@media (max-width: 767px) {
  .hide-sm { display: none !important; }
  .hide-mobile { display: none !important; }
}

@media (max-width: 991px) {
  .hide-md { display: none !important; }
  .hide-tablet { display: none !important; }
}

@media (min-width: 768px) {
  .hide-desktop { display: none !important; }
  .show-mobile { display: none !important; }
}

@media (min-width: 992px) {
  .hide-lg { display: none !important; }
}

@media (min-width: 1200px) {
  .hide-xl { display: none !important; }
}

/* Responsive Text Alignment */
@media (max-width: 768px) {
  .text-center-mobile { text-align: center !important; }
  .text-left-mobile { text-align: left !important; }
}

/* Responsive Spacing */
@media (max-width: 768px) {
  .mt-mobile-0 { margin-top: 0 !important; }
  .mb-mobile-0 { margin-bottom: 0 !important; }
  .px-mobile-0 { padding-left: 0 !important; padding-right: 0 !important; }
}

/* ==================== 9. ACCESSIBILITY ==================== */

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

/* Skip to Content Link */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-primary);
  color: var(--color-bg-primary);
  text-decoration: none;
  z-index: var(--z-tooltip);
  transition: top var(--transition-base);
}

.skip-to-content:focus {
  top: 0;
}

/* 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;
}

/* 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;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
  }
  
  .btn {
    border: 2px solid currentColor;
  }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-md);
  border: 2px solid var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

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

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

/* 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 {
    page-break-after: avoid;
  }
}