/* ==========================================================================
   LG CORPORATE - DESIGN SYSTEM & UTILITIES (css/utilities.css)
   ========================================================================== */

/* 1. Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;600;700;800&family=Poppins:wght@300;400;500;600;700;800&display=swap');

/* 2. Custom Properties (Design Tokens) */
:root {
  /* Color Palette */
  --color-primary: #0A1F33;
  --color-secondary: #163A5F;
  --color-accent: #E63946;
  --color-accent-hover: #D62839;
  --color-bg-light: #F8FAFC;
  --color-bg-dark: #06111C;
  --color-text-main: #1E293B;
  --color-text-muted: #64748B;
  --color-text-light: #F8FAFC;
  --color-text-light-muted: #94A3B8;

  /* Glassmorphism Styles */
  --glass-bg-light: rgba(255, 255, 255, 0.75);
  --glass-bg-dark: rgba(10, 31, 51, 0.65);
  --glass-border-light: rgba(255, 255, 255, 0.35);
  --glass-border-dark: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.08);
  --glass-shadow-dark: 0 8px 32px 0 rgba(0, 0, 0, 0.25);
  --glass-backdrop-blur: 15px;

  /* Typography Fonts */
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-numbers: 'Outfit', sans-serif;

  /* Fluid Typography Sizes (Scales fluidly from 320px to 3840px 4K) */
  --fs-hero-title: clamp(2.25rem, 4.5vw + 1rem, 6rem);
  --fs-hero-subtitle: clamp(1rem, 1.5vw + 0.5rem, 2rem);
  --fs-section-title: clamp(1.75rem, 3.2vw + 0.5rem, 3.5rem);
  --fs-section-subtitle: clamp(0.85rem, 0.8vw + 0.6rem, 1.25rem);
  --fs-card-title: clamp(1.15rem, 1vw + 0.8rem, 1.75rem);
  --fs-body: clamp(0.95rem, 0.2vw + 0.85rem, 1.25rem);
  --fs-body-sm: clamp(0.8rem, 0.1vw + 0.75rem, 1rem);
  --fs-stats-num: clamp(2.5rem, 5vw + 1rem, 6rem);

  /* Fluid Spacing & Grid System */
  --container-max-width: min(1280px, 90vw);
  --section-padding: clamp(60px, 8vw, 120px);
  --grid-gap: clamp(16px, 2.5vw, 32px);
  
  /* Transition Presets */
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease-out;
  --transition-slow: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

/* Apply 4K modifications */
@media (min-width: 2560px) {
  :root {
    --container-max-width: min(2000px, 92vw);
    --section-padding: 160px;
    --grid-gap: 48px;
  }
}

/* 3. Global CSS Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* High-contrast and dark-mode friendly defaults */
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  color: var(--color-text-main);
  background-color: var(--color-bg-light);
  line-height: 1.6;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

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

/* Accessibility Focus Styles */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* 4. Common Layout Classes */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section {
  padding-top: var(--section-padding);
  padding-bottom: var(--section-padding);
  position: relative;
}

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

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto calc(var(--section-padding) * 0.6) auto;
}

.section-subtitle {
  font-family: var(--font-heading);
  font-size: var(--fs-body-sm);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--fs-section-title);
  color: inherit;
  font-weight: 700;
  line-height: 1.2;
}

.section-title span {
  color: var(--color-accent);
}

/* 5. 12-Column Grid System */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
}

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

/* Responsive grid modifications */
@media (max-width: 1024px) {
  .col-lg-12 { grid-column: span 12; }
  .col-lg-6  { grid-column: span 6; }
  .col-lg-4  { grid-column: span 4; }
  .col-lg-3  { grid-column: span 3; }
}

@media (max-width: 768px) {
  .col-md-12 { grid-column: span 12; }
  .col-md-6  { grid-column: span 6; }
  .col-md-4  { grid-column: span 4; }
}

@media (max-width: 480px) {
  .col-sm-12 { grid-column: span 12; }
}

/* 6. Premium Glassmorphic Styles */
.glass-panel {
  background: var(--glass-bg-light);
  backdrop-filter: blur(var(--glass-backdrop-blur));
  -webkit-backdrop-filter: blur(var(--glass-backdrop-blur));
  border: 1px solid var(--glass-border-light);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-lg);
}

.glass-panel-dark {
  background: var(--glass-bg-dark);
  backdrop-filter: blur(var(--glass-backdrop-blur));
  -webkit-backdrop-filter: blur(var(--glass-backdrop-blur));
  border: 1px solid var(--glass-border-dark);
  box-shadow: var(--glass-shadow-dark);
  border-radius: var(--radius-lg);
}

/* 7. Button Styles (Magnetic / Premium Hover effects) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-heading);
  font-size: var(--fs-body-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-text-light);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-accent-hover);
  transform: translateY(100%);
  transition: var(--transition-smooth);
  z-index: -1;
}

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

.btn-secondary {
  border: 1px solid var(--glass-border-light);
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-light);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.btn-secondary:hover {
  background: var(--color-text-light);
  color: var(--color-primary);
  border-color: var(--color-text-light);
}

.btn-dark {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.btn-dark::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-secondary);
  transform: translateY(100%);
  transition: var(--transition-smooth);
  z-index: -1;
}

.btn-dark:hover::before {
  transform: translateY(0);
}

.btn-icon {
  margin-left: 8px;
  transition: var(--transition-fast);
}

.btn:hover .btn-icon {
  transform: translateX(4px);
}

/* 8. UI Helpers */
.flex { display: flex; }
.flex-column { display: flex; flex-direction: column; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }

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

.font-heading { font-family: var(--font-heading); }
.font-numbers { font-family: var(--font-numbers); }

.opacity-70 { opacity: 0.7; }
.opacity-50 { opacity: 0.5; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}