/* ============================================
   GardenForum - Main Stylesheet
   Version: 1.0
   Description: Complete CSS foundation with design system
   ============================================ */

/* ============================================
   1. CSS VARIABLES (Design System)
   ============================================ */
:root {
  /* Primary Colors */
  --forest-green: #2d6a4f;
  --sage-green: #95d5b2;
  --warm-orange: #fb8500;
  
  /* Neutral Colors */
  --light-cream: #f8f9fa;
  --white: #ffffff;
  --dark-charcoal: #212529;
  --medium-gray: #6c757d;
  --light-gray: #dee2e6;
  --border-gray: #e9ecef;
  
  /* Semantic Colors */
  --success-green: #52b788;
  --warning-yellow: #ffc300;
  --danger-red: #e63946;
  --info-blue: #0dcaf0;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
  --shadow-hover: 0 8px 16px rgba(0,0,0,0.2);
  
  /* Borders */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  
  /* Spacing Scale */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ============================================
   2. RESET & BASE STYLES
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--dark-charcoal);
  background-color: var(--light-cream);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--dark-charcoal);
}

h1 { font-size: 2.5rem; }      /* 40px */
h2 { font-size: 2rem; }        /* 32px */
h3 { font-size: 1.5rem; }      /* 24px */
h4 { font-size: 1.25rem; }     /* 20px */
h5 { font-size: 1.125rem; }    /* 18px */
h6 { font-size: 1rem; }        /* 16px */

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

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

a:hover {
  color: var(--sage-green);
  text-decoration: underline;
}

small {
  font-size: 0.875rem;
  color: var(--medium-gray);
}

strong, b {
  font-weight: 600;
}

code {
  font-family: 'Fira Code', 'Courier New', monospace;
  background-color: var(--light-gray);
  padding: 0.125rem 0.25rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.9em;
}

/* ============================================
   4. LAYOUT SYSTEM
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 calc(var(--spacing-md) * -1);
}

.col {
  flex: 1;
  padding: 0 var(--spacing-md);
  min-width: 0;
}

/* Column widths - using flex for better control */
.col-12 { flex: 0 0 100%; max-width: 100%; padding: 0 var(--spacing-md); }
.col-11 { flex: 0 0 91.666%; max-width: 91.666%; padding: 0 var(--spacing-md); }
.col-10 { flex: 0 0 83.333%; max-width: 83.333%; padding: 0 var(--spacing-md); }
.col-9 { flex: 0 0 75%; max-width: 75%; padding: 0 var(--spacing-md); }
.col-8 { 
  flex: 0 0 66.666%; 
  max-width: 66.666%; 
  padding: 0 var(--spacing-md);
  padding-right: var(--spacing-xl);
}
.col-7 { flex: 0 0 58.333%; max-width: 58.333%; padding: 0 var(--spacing-md); }
.col-6 { flex: 0 0 50%; max-width: 50%; padding: 0 var(--spacing-md); }
.col-5 { flex: 0 0 41.666%; max-width: 41.666%; padding: 0 var(--spacing-md); }
.col-4 { 
  flex: 0 0 33.333%; 
  max-width: 33.333%; 
  padding: 0 var(--spacing-md);
  padding-left: var(--spacing-xl);
}
.col-3 { flex: 0 0 25%; max-width: 25%; padding: 0 var(--spacing-md); }
.col-2 { flex: 0 0 16.666%; max-width: 16.666%; padding: 0 var(--spacing-md); }
.col-1 { flex: 0 0 8.333%; max-width: 8.333%; padding: 0 var(--spacing-md); }

/* ============================================
   5. NAVIGATION BAR
   ============================================ */
.navbar {
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--spacing-md) 0;
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: 'Poppins', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--forest-green);
  text-decoration: none;
}

.navbar-brand:hover {
  text-decoration: none;
  color: var(--forest-green);
}

.navbar-brand-icon {
  font-size: 1.75rem;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  margin: 0;
}

.navbar-menu li {
  margin: 0;
}

.navbar-menu a {
  color: var(--dark-charcoal);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.navbar-menu a:hover {
  background-color: var(--light-cream);
  text-decoration: none;
}

.navbar-menu a.active {
  color: var(--forest-green);
  background-color: rgba(45, 106, 79, 0.1);
}

.navbar-actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

/* ============================================
   6. BUTTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  line-height: 1.5;
}

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

.btn-primary:hover {
  background-color: #246049;
  color: var(--white);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--sage-green);
  color: var(--dark-charcoal);
}

.btn-secondary:hover {
  background-color: #7fc9a8;
  text-decoration: none;
  transform: translateY(-2px);
}

.btn-cta {
  background-color: var(--warm-orange);
  color: var(--white);
  font-weight: 600;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
}

.btn-cta:hover {
  background-color: #e07700;
  color: var(--white);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover {
  background-color: var(--forest-green);
  color: var(--white);
  text-decoration: none;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1.125rem;
}

/* ============================================
   7. CARDS
   ============================================ */
.card {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  transition: all var(--transition-base);
}

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

.card-header {
  border-bottom: 1px solid var(--border-gray);
  padding-bottom: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--dark-charcoal);
}

.card-title a {
  color: var(--dark-charcoal);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.card-title a:hover {
  color: var(--forest-green);
  text-decoration: none;
}

.card-meta {
  display: flex;
  gap: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--medium-gray);
  margin-bottom: var(--spacing-sm);
}

.card-meta-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.card-content {
  color: var(--dark-charcoal);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.card-footer {
  border-top: 1px solid var(--border-gray);
  padding-top: var(--spacing-md);
  margin-top: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ============================================
   8. BADGES
   ============================================ */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--border-radius-xl);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-primary {
  background-color: var(--forest-green);
  color: var(--white);
}

.badge-secondary {
  background-color: var(--sage-green);
  color: var(--dark-charcoal);
}

.badge-success {
  background-color: var(--success-green);
  color: var(--white);
}

.badge-warning {
  background-color: var(--warning-yellow);
  color: var(--dark-charcoal);
}

.badge-danger {
  background-color: var(--danger-red);
  color: var(--white);
}

/* Tag badges */
.tag {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  font-size: 0.875rem;
  background-color: var(--light-gray);
  color: var(--dark-charcoal);
  border-radius: var(--border-radius-xl);
  text-decoration: none;
  transition: all var(--transition-fast);
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

.tag:hover {
  background-color: var(--forest-green);
  color: var(--white);
  text-decoration: none;
}

/* ============================================
   9. HERO SECTION
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--forest-green) 0%, #1f5c42 100%);
  color: var(--white);
  padding: var(--spacing-xxl) 0;
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.hero h1 {
  color: var(--white);
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  opacity: 0.95;
}

.hero-search {
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

.search-box {
  display: flex;
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.search-box input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  font-size: 1rem;
  outline: none;
}

.search-box button {
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--warm-orange);
  color: var(--white);
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: background-color var(--transition-fast);
}

.search-box button:hover {
  background-color: #e07700;
}

/* ============================================
   10. STATS BAR
   ============================================ */
.stats-bar {
  background-color: var(--white);
  padding: var(--spacing-lg) 0;
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-xl);
}

.stats-container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

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

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--forest-green);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--medium-gray);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ============================================
   11. CATEGORY GRID
   ============================================ */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.category-card {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  text-decoration: none;
  display: block;
  border: 2px solid transparent;
}

.category-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--forest-green);
  text-decoration: none;
}

.category-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

.category-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--dark-charcoal);
  margin-bottom: var(--spacing-sm);
}

.category-description {
  font-size: 0.875rem;
  color: var(--medium-gray);
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

.category-stats {
  font-size: 0.875rem;
  color: var(--forest-green);
  font-weight: 500;
}

/* ============================================
   12. TOPIC LIST
   ============================================ */
.topic-list {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.topic-item {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-gray);
  transition: background-color var(--transition-fast);
}

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

.topic-item:hover {
  background-color: var(--light-cream);
}

.topic-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.topic-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.topic-title a {
  color: var(--dark-charcoal);
  text-decoration: none;
}

.topic-title a:hover {
  color: var(--forest-green);
  text-decoration: none;
}

.topic-excerpt {
  color: var(--medium-gray);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.topic-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.topic-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
}

.topic-author img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.topic-stats {
  display: flex;
  gap: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--medium-gray);
}

/* ============================================
   13. SIDEBAR
   ============================================ */
.sidebar {
  position: sticky;
  top: 100px;
}

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

.sidebar-widget h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--forest-green);
}

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

.sidebar-list li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-gray);
}

.sidebar-list li:last-child {
  border-bottom: none;
}

.sidebar-list a {
  color: var(--dark-charcoal);
  text-decoration: none;
  display: block;
  transition: color var(--transition-fast);
}

.sidebar-list a:hover {
  color: var(--forest-green);
  text-decoration: none;
  padding-left: var(--spacing-sm);
}

/* ============================================
   14. FOOTER
   ============================================ */
.footer {
  background-color: var(--dark-charcoal);
  color: var(--light-gray);
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
  margin-top: var(--spacing-xxl);
}

.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(--white);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

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

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

.footer-section a {
  color: var(--light-gray);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--sage-green);
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.875rem;
}

/* ============================================
   15. UTILITY CLASSES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--forest-green); }
.text-secondary { color: var(--medium-gray); }
.text-success { color: var(--success-green); }
.text-danger { color: var(--danger-red); }
.text-warning { color: var(--warning-yellow); }

.bg-primary { background-color: var(--forest-green); }
.bg-light { background-color: var(--light-cream); }
.bg-white { background-color: var(--white); }

.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); }

.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); }

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

.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

/* ============================================
   16. RESPONSIVE DESIGN
   ============================================ */

/* Tablet */
@media (max-width: 992px) {
  .navbar-menu {
    display: none; /* Will add mobile menu later */
  }
  
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .category-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
  
  /* Stack columns on tablet */
  .col-8, .col-4 {
    flex: 0 0 100%;
    max-width: 100%;
    padding: 0 var(--spacing-md);
  }
}

/* Mobile */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .stats-container {
    gap: var(--spacing-md);
  }
  
  .stat-number {
    font-size: 1.5rem;
  }
  
  .category-grid {
    grid-template-columns: 1fr;
  }
  
  .topic-footer {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  h3 { font-size: 1.5rem; }
}

/* Small Mobile */
@media (max-width: 480px) {
  .search-box {
    flex-direction: column;
  }
  
  .search-box button {
    width: 100%;
  }
  
  .btn-cta {
    display: block;
    width: 100%;
  }
}