/* ============================================================
   Daily Calculator Hub - Global Stylesheet
   Design System: Navy Blue (#1B2A4A), Sky Blue (#4A90D9), Neutrals
   60-30-10 Color Rule Applied
   ============================================================ */

/* ============================================================
   CSS VARIABLES - Color Palette & Design Tokens
   ============================================================ */
:root {
  /* Primary Colors (60%) */
  --color-primary: #1B2A4A;        /* Navy Blue */
  --color-primary-light: #2D3E5F;
  --color-primary-dark: #0F1823;

  /* Secondary Colors (30%) */
  --color-secondary: #4A90D9;      /* Sky Blue */
  --color-secondary-light: #6BA3E5;
  --color-secondary-dark: #2E5AA8;

  /* Neutrals (10%) + Accents */
  --color-neutral-white: #FFFFFF;
  --color-neutral-light: #F5F7FA;
  --color-neutral-gray: #8B95A5;
  --color-neutral-dark: #3D4A5C;
  --color-border: #E0E6ED;

  /* Semantic Colors */
  --color-success: #27AE60;
  --color-warning: #F39C12;
  --color-error: #E74C3C;
  --color-info: #3498DB;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* ============================================================
   GLOBAL STYLES
   ============================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-primary);
  background-color: var(--color-neutral-light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

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

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-base);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-neutral-dark);
}

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

a:hover {
  color: var(--color-secondary-dark);
  text-decoration: underline;
}

/* ============================================================
   HEADER & NAVIGATION
   ============================================================ */
header {
  background-color: var(--color-primary);
  color: var(--color-neutral-white);
  padding: var(--spacing-lg) var(--spacing-md);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-neutral-white);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo::before {
  content: '🧮';
  font-size: var(--font-size-2xl);
}

nav {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

nav a {
  color: var(--color-neutral-white);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  position: relative;
}

nav a:hover {
  color: var(--color-secondary-light);
  text-decoration: none;
}

/* Dropdown Menu */
.nav-item {
  position: relative;
}

.dropdown-toggle::after {
  content: '▼';
  font-size: var(--font-size-xs);
  margin-left: var(--spacing-sm);
  transition: transform var(--transition-fast);
}

.nav-item:hover .dropdown-toggle::after {
  transform: rotate(180deg);
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--color-primary-light);
  min-width: 200px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  margin-top: 0;
  padding-top: var(--spacing-sm);
  overflow: hidden;
}

.nav-item:hover .dropdown-menu {
  display: block;
  animation: slideDown var(--transition-fast);
}

.dropdown-menu a {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-neutral-white);
  transition: background-color var(--transition-fast);
}

.dropdown-menu a:hover {
  background-color: var(--color-secondary);
  text-decoration: none;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-neutral-white);
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: var(--spacing-sm);
}

.mobile-menu-toggle.active::before {
  content: '✕';
}

.mobile-menu-toggle:not(.active)::before {
  content: '☰';
}

/* ============================================================
   BREADCRUMBS
   ============================================================ */
.breadcrumb {
  padding: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
  color: var(--color-neutral-gray);
}

.breadcrumb a {
  color: var(--color-secondary);
}

.breadcrumb span {
  margin: 0 var(--spacing-sm);
}

/* ============================================================
   MAIN LAYOUT - Page Container
   ============================================================ */
.page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  width: 100%;
}

.page-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-xl);
}

.page-content {
  grid-column: 1;
}

.page-sidebar {
  grid-column: 2;
}

/* ============================================================
   HERO SECTION (Homepage)
   ============================================================ */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-neutral-white);
  padding: var(--spacing-3xl) var(--spacing-md);
  text-align: center;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-3xl);
}

.hero h1 {
  color: var(--color-neutral-white);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-4xl);
}

.hero p {
  color: var(--color-neutral-light);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
}

/* ============================================================
   CATEGORY CARDS GRID
   ============================================================ */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.category-card {
  background-color: var(--color-neutral-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  cursor: pointer;
}

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

.category-card-icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
}

.category-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.category-card p {
  font-size: var(--font-size-sm);
  color: var(--color-neutral-gray);
}

/* ============================================================
   CALCULATOR CARDS (Popular Section)
   ============================================================ */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.calculator-card {
  background-color: var(--color-neutral-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.calculator-card-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.calculator-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-lg);
}

.calculator-card p {
  font-size: var(--font-size-sm);
  color: var(--color-neutral-gray);
  margin-bottom: var(--spacing-md);
}

.calculator-card a {
  display: inline-block;
  background-color: var(--color-secondary);
  color: var(--color-neutral-white);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  transition: background-color var(--transition-fast);
}

.calculator-card a:hover {
  background-color: var(--color-secondary-dark);
  text-decoration: none;
}

/* ============================================================
   CALCULATOR FORM STYLES
   ============================================================ */
.calculator-form {
  background-color: var(--color-neutral-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

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

.form-group input,
.form-group select {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.form-row .form-group {
  margin-bottom: 0;
}

/* Toggle Button Group */
.toggle-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.toggle-btn {
  flex: 1;
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  background-color: var(--color-neutral-white);
  color: var(--color-neutral-dark);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toggle-btn.active {
  background-color: var(--color-secondary);
  color: var(--color-neutral-white);
  border-color: var(--color-secondary);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-neutral-white);
}

.btn-primary:hover {
  background-color: var(--color-secondary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--color-neutral-light);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-border);
  text-decoration: none;
}

.btn-block {
  width: 100%;
}

/* ============================================================
   RESULT DISPLAY
   ============================================================ */
.result-box {
  background-color: var(--color-neutral-light);
  border-left: 4px solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  display: none;
}

.result-box.active {
  display: block;
  animation: slideIn var(--transition-base);
}

.result-label {
  font-size: var(--font-size-sm);
  color: var(--color-neutral-gray);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.result-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-secondary);
}

.result-secondary {
  font-size: var(--font-size-base);
  color: var(--color-neutral-dark);
  margin-top: var(--spacing-md);
}

/* Result Categories (BMI) */
.result-category {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-medium);
  margin-top: var(--spacing-md);
  color: var(--color-neutral-white);
}

.result-category.underweight {
  background-color: var(--color-info);
}

.result-category.normal {
  background-color: var(--color-success);
}

.result-category.overweight {
  background-color: var(--color-warning);
}

.result-category.obese {
  background-color: var(--color-error);
}

/* ============================================================
   TABLES
   ============================================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-neutral-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
}

.data-table thead {
  background-color: var(--color-primary);
  color: var(--color-neutral-white);
}

.data-table th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
}

.data-table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.data-table tbody tr:hover {
  background-color: var(--color-neutral-light);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* ============================================================
   TABS
   ============================================================ */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--spacing-xl);
}

.tab-button {
  background: none;
  border: none;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-neutral-gray);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
}

.tab-button.active {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
}

.tab-button:hover {
  color: var(--color-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn var(--transition-fast);
}

/* ============================================================
   ACCORDION (FAQ)
   ============================================================ */
.accordion {
  background-color: var(--color-neutral-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: var(--spacing-xl);
}

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

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-header {
  background-color: var(--color-neutral-light);
  padding: var(--spacing-lg);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
}

.accordion-header:hover {
  background-color: var(--color-border);
}

.accordion-toggle {
  font-size: var(--font-size-lg);
  transition: transform var(--transition-fast);
}

.accordion-item.active .accordion-toggle {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.accordion-item.active .accordion-content {
  max-height: 1000px;
}

.accordion-body {
  padding: var(--spacing-lg);
  color: var(--color-neutral-dark);
  line-height: 1.8;
}

/* ============================================================
   FORMULA DISPLAY
   ============================================================ */
.formula-block {
  background-color: var(--color-neutral-light);
  border-left: 4px solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-sm);
  overflow-x: auto;
}

.formula-block strong {
  color: var(--color-primary);
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar-widget {
  background-color: var(--color-neutral-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
}

.sidebar-widget h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.sidebar-widget ul {
  list-style: none;
}

.sidebar-widget li {
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-widget li:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.sidebar-widget a {
  font-size: var(--font-size-sm);
  color: var(--color-secondary);
}

/* ============================================================
   RELATED CALCULATORS
   ============================================================ */
.related-calculators {
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--color-border);
}

.related-calculators h3 {
  margin-bottom: var(--spacing-lg);
}

.related-calc-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.related-calc-item {
  background-color: var(--color-neutral-light);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.related-calc-item:hover {
  background-color: var(--color-border);
  transform: translateX(4px);
}

.related-calc-item a {
  font-weight: var(--font-weight-medium);
  text-decoration: none;
}

/* ============================================================
   ADSENSE PLACEHOLDERS
   ============================================================ */
.adsense-placeholder {
  background-color: var(--color-neutral-light);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  text-align: center;
  color: var(--color-neutral-gray);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-xl);
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.adsense-placeholder::before {
  content: '📢 AdSense Placeholder';
  font-weight: var(--font-weight-medium);
}

.adsense-top {
  min-height: 90px;
}

.adsense-sidebar {
  min-height: 250px;
}

.adsense-content {
  min-height: 280px;
}

.adsense-bottom {
  min-height: 90px;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background-color: var(--color-primary);
  color: var(--color-neutral-white);
  padding: var(--spacing-2xl) var(--spacing-md);
  margin-top: var(--spacing-3xl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  color: var(--color-neutral-white);
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--color-secondary-light);
  font-size: var(--font-size-sm);
}

.footer-section a:hover {
  color: var(--color-neutral-white);
}

.footer-bottom {
  border-top: 1px solid var(--color-primary-light);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-neutral-gray);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

/* Tablet (768px and below) */
@media (max-width: 768px) {
  h1 {
    font-size: var(--font-size-3xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }

  .page-layout {
    grid-template-columns: 1fr;
  }

  .page-sidebar {
    grid-column: 1;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .mobile-menu-toggle {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-primary-light);
    padding: var(--spacing-lg) var(--spacing-md);
    gap: var(--spacing-md);
  }

  nav.active {
    display: flex;
  }

  .dropdown-menu {
    position: static;
    display: none;
    background-color: var(--color-primary-dark);
    margin-top: 0;
    box-shadow: none;
  }

  .nav-item:hover .dropdown-menu {
    display: none;
  }

  .nav-item.active .dropdown-menu {
    display: block;
  }

  .category-grid,
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: var(--spacing-2xl) var(--spacing-md);
  }

  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .tabs {
    flex-wrap: wrap;
  }

  .tab-button {
    padding: var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .data-table {
    font-size: var(--font-size-sm);
  }

  .data-table th,
  .data-table td {
    padding: var(--spacing-sm);
  }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  h1 {
    font-size: var(--font-size-2xl);
  }

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

  .page-container {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .calculator-form {
    padding: var(--spacing-lg);
  }

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

  .hero h1 {
    font-size: var(--font-size-2xl);
  }

  .hero p {
    font-size: var(--font-size-base);
  }

  .result-value {
    font-size: var(--font-size-2xl);
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.hidden {
  display: none !important;
}

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

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

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

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

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

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

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

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

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

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

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

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