:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --text-dark: #1f2937;
  --text-light: #4b5563;
  --bg-main: #f9fafb;
  --bg-card: #ffffff;
  --border-color: #e5e7eb;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-dark);
  line-height: 1.5;
}

/* Header Navbar */
.navbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.logo a {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  padding: 4rem 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: 2rem;
}

.cta-btn {
  display: inline-block;
  background-color: var(--primary-color);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: background-color 0.2s;
}

.cta-btn:hover {
  background-color: var(--primary-dark);
}

/* Controls Bar */
.controls-bar {
  max-width: var(--max-width);
  margin: 2rem auto 1rem auto;
  padding: 0 2rem;
  display: flex;
  gap: 1rem;
}

.search-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--bg-card);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.sort-select {
  padding: 0.75rem 2rem 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--bg-card);
  cursor: pointer;
  outline: none;
}

/* Sidebar Extensions Layout */
.extension-pills-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 200px;
  overflow-y: auto;
  padding-right: 4px;
}

.extension-pill {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  cursor: pointer;
  transition: all 0.15s ease-in-out;
  user-select: none;
  text-align: left;
}

.extension-pill:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.extension-pill.pill-active {
  background-color: var(--primary-color);
  color: white !important;
  border-color: var(--primary-color);
  font-weight: 600;
}

/* Layout Containers */
.domain-section {
  max-width: var(--max-width);
  margin: 0 auto 4rem auto;
  padding: 0 2rem;
}

.main-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2rem;
  align-items: start;
}

.content-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Sidebar Filters */
.sidebar-filters {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
}

.sidebar-header {
  margin-bottom: 1.5rem;
}

.filter-headline {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
}

.mobile-close-filters {
  display: none;
}

.filter-group {
  margin-bottom: 1.25rem;
}

.filter-subheading {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.sidebar-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
}

.sidebar-input:focus {
  border-color: var(--primary-color);
}

.price-inputs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.price-separator {
  color: var(--text-light);
  font-weight: 500;
}

.sidebar-divider {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 1.5rem 0;
}

.checkbox-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
}

.checkbox-label {
  font-size: 0.95rem;
  color: var(--text-dark);
  user-select: none;
}

.clear-filters-btn {
  width: 100%;
  background: none;
  border: 1px dashed var(--border-color);
  padding: 0.5rem;
  border-radius: 6px;
  color: var(--text-light);
  cursor: pointer;
  font-weight: 500;
  margin-top: 0.5rem;
  transition: all 0.2s;
}

.clear-filters-btn:hover {
  border-color: #ef4444;
  color: #ef4444;
  background-color: #fef2f2;
}

/* Domain Listing Grid */
#list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  display: grid;
  grid-template-areas: 
    "title title"
    "price button";
  align-items: center;
  row-gap: 1.25rem;
}

.domain-title {
  grid-area: title;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-dark);
  word-break: break-all;
}

.domain-price {
  grid-area: price;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-color);
}

.buy-btn {
  grid-area: button;
  justify-self: end;
  background: none;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s;
  cursor: pointer;
}

.buy-btn:hover {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-dark);
}

/* Pagination UI Styles */
.pagination-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin: 1rem 0;
}

.load-more-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.85rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.15s, transform 0.1s;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.1);
}

.load-more-btn:hover {
  background-color: var(--primary-dark);
}

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

.pagination-counter {
  font-size: 0.9rem;
  color: var(--text-light);
  font-weight: 500;
}

/* Landing Elements Layout */
.metrics-container {
  max-width: var(--max-width);
  margin: 4rem auto;
  padding: 0 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
}

.tld-card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.tld-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
}

.tld-name {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary-color);
}

.tld-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-light);
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-light);
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  font-size: 0.9rem;
}

/* Mobile Filtering Interaction Trigger Layout Button */
.mobile-filter-btn {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.2rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-card);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-dark);
}

/* ==========================================================================
   PRODUCTION RESPONSIVE MOBILE OVERRIDES (< 768px Viewports)
   ========================================================================== */
@media (max-width: 768px) {
  .nav-container {
    padding: 1rem;
  }
  
  .hero {
    padding: 2.5rem 1rem;
  }
  .hero h1 {
    font-size: 2rem;
  }

  /* Reordering: Search (Top Width) -> Sort & Toggle Inline Button */
  .controls-bar {
    padding: 0 1rem;
    margin: 1.5rem auto;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .search-input {
    min-width: 100%;
    order: 1;
  }

  .sort-select {
    flex: 1;
    order: 2;
    min-width: 0;
  }

  .mobile-filter-btn {
    display: inline-flex;
    order: 3;
  }

  .extension-pills-container {
    padding: 0 1rem;
    margin-bottom: 1rem;
  }

  .domain-section {
    padding: 0 1rem;
  }

  .main-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  /* Filters into Slide-In Left Overlay Modal Drawer */
  .sidebar-filters {
    position: fixed;
    top: 0;
    left: -100%;
    width: 85%;
    max-width: 340px;
    height: 100%;
    z-index: 1000;
    overflow-y: auto;
    box-shadow: 4px 0 25px rgba(0, 0, 0, 0.15);
    transition: left 0.3s ease-in-out;
    border-radius: 0;
    border: none;
    display: block;
  }

  .sidebar-filters.mobile-open {
    left: 0;
  }

  .sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
  }

  .mobile-close-filters {
    display: block;
    background: none;
    border: none;
    font-size: 1.75rem;
    cursor: pointer;
    color: var(--text-light);
    line-height: 1;
  }

  /* Dark Mask UI Overlay Background */
  .sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    z-index: 999;
    display: none;
  }
  
  .sidebar-overlay.active {
    display: block;
  }

  .extension-pills-sidebar {
    flex-direction: row; /* Horizontal scrolling inside mobile drawer filters */
    overflow-x: auto;
    overflow-y: hidden;
    max-height: none;
    padding-bottom: 0.5rem;
  }
  .extension-pill {
    white-space: nowrap;
    border-radius: 20px;
  }

  /* Responsive Grid Card Listings Parameters */
  #list {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
  }

  .card {
    padding: 1.25rem;
    grid-template-areas: 
      "title title"
      "price button";
  }
  
  .domain-title {
    font-size: 1.25rem;
  }

  .load-more-btn {
    width: 100%; /* Full width button on mobile for easier tapping */
    padding: 0.95rem 1.5rem;
  }
}