/* HaveVibeEdu - Global Stylesheet (style.css) */
/* Fonts are loaded via <link> in HTML for better performance */

:root {
  /* Color Palette */
  --primary-color: #0B1F3A;    /* Deep Navy Blue */
  --secondary-color: #102A43;  /* Steel Blue */
  --accent-color: #16A34A;     /* Green Accent */
  --accent-hover: #15803d;     /* Darker Green for Hover */
  --bg-color: #F8FAFC;         /* Soft Light Gray Background */
  --card-bg: #FFFFFF;
  --text-primary: #1E293B;     /* Slate Dark Text */
  --text-muted: #64748B;       /* Muted gray text */
  --white: #FFFFFF;
  --border-color: #E2E8F0;     /* Border gray */
  --success-color: #16A34A;
  --error-color: #EF4444;

  /* Typography */
  --font-headings: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 5rem;

  /* UI Tokens */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 30px;
  --radius-round: 50%;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.08);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.1);
  --shadow-glass: 0 8px 32px 0 rgba(11, 31, 58, 0.08);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s ease;

  /* Layout Max Width */
  --max-width: 1200px;
}

/* Reset Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeSpeed;
}

/* Optimized image rendering */
img {
  display: block;
  max-width: 100%;
  height: auto;
  image-rendering: -webkit-optimize-contrast;
}

/* Performance: skip rendering for offscreen sections */
.section {
  content-visibility: auto;
  contain-intrinsic-size: 0 500px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headings);
  font-weight: 700;
  color: var(--primary-color);
  line-height: 1.25;
}

h1 {
  font-size: 2.75rem;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  position: relative;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-muted);
  font-size: 1rem;
}

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

ul {
  list-style: none;
}

/* Layout Grid & Flex */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.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);
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

/* Interactive Components & Elements */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.6rem;
  font-size: 0.95rem;
  font-family: var(--font-headings);
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition-normal);
  gap: 8px;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(22, 163, 74, 0.4);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(22, 163, 74, 0.5);
}

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

.btn-secondary:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--white);
  transform: translateY(-2px);
}

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

.btn-white:hover {
  background-color: var(--bg-color);
  transform: translateY(-2px);
}

/* Inputs and Forms */
.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: var(--transition-fast);
  background-color: var(--white);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.15);
}

/* Rounded Card and Soft Shadow UI */
.card {
  background-color: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition-normal);
}

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

/* Glassmorphism Classes */
.glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.glass-dark {
  background: rgba(11, 31, 58, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Badges & Tags */
.badge {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: #E2E8F0;
  color: var(--text-primary);
}

.badge-accent {
  background-color: rgba(22, 163, 74, 0.15);
  color: var(--accent-color);
}

.badge-primary {
  background-color: rgba(11, 31, 58, 0.1);
  color: var(--primary-color);
}

/* Keyframe Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.animate-pulse {
  animation: pulse 2s infinite ease-in-out;
}

/* Utilities */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Layout Helpers */
.sidebar-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--spacing-xl);
}

.responsive-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.blog-list-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--spacing-lg);
  align-items: start;
  padding: var(--spacing-md);
}


/* Responsive adjustments */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .sidebar-layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  h1 {
    font-size: 2.25rem;
  }
  h2 {
    font-size: 1.75rem;
  }
  .grid-4, .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
  .section {
    padding: var(--spacing-xl) 0;
  }
  .listing-control-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .listing-control-bar > div:first-child {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .hide-on-mobile {
    display: none !important;
  }
}

@media (max-width: 600px) {
  .responsive-grid-2 {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
  .blog-list-card {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
}

/* Print styles */
@media print {
  .site-header, .site-footer, .floating-container, .float-btn,
  .btn, .modal-overlay { display: none !important; }
  body { background: white; color: black; }
  .card { box-shadow: none; border: 1px solid #ccc; }
  a { color: black; text-decoration: underline; }
}