/**
 * AFF168 - Global Affiliate Marketing Directory
 * Modern CSS Design System
 * Version: 2.0.0
 * Optimized for Core Web Vitals
 */

/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  /* Primary Colors */
  --primary-color: #3498db;
  --primary-dark: #2980b9;
  --primary-light: #5dade2;
  --secondary-color: #2ecc71;
  --secondary-dark: #27ae60;

  /* Text Colors */
  --text-color: #2c3e50;
  --text-secondary: #7f8c8d;
  --text-muted: #95a5a6;

  /* Background Colors */
  --bg-color: #f5f7fa;
  --bg-white: #ffffff;
  --bg-card: #ffffff;
  --bg-highlight: #f0f8ff;

  /* Border Colors */
  --border-color: #e0e6ed;
  --border-light: #f0f3f7;

  /* Link Colors */
  --link-color: #3498db;
  --link-hover: #2980b9;
  --detail-link-color: #2ecc71;

  /* Effects */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-hover: 0 8px 25px rgba(0,0,0,0.15);

  /* Typography */
  --font-stack: -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: 1.875rem;

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

  /* Border Radius */
  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

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

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   Accessibility
   =========================== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-color);
  color: #fff;
  padding: 12px 24px;
  border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 600;
  text-decoration: none;
  z-index: 10000;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 0;
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--primary-color);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ===========================
   Layout Container
   =========================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* ===========================
   Header Styles
   =========================== */
.header {
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.logo {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo::before {
  content: "🌐";
  font-size: 1.3em;
}

/* Navigation */
.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary-color);
  background-color: var(--bg-color);
}

/* Search Box */
.search-box {
  flex: 1;
  max-width: 400px;
  margin: 0 var(--spacing-xl);
  position: relative;
}

.search-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}

.search-clear {
  display: none;
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: var(--font-size-lg);
}

.search-box.has-value .search-clear {
  display: block;
}

/* Language Switcher */
.lang-switcher select {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-white);
  color: var(--text-color);
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: var(--transition);
}

.lang-switcher select:hover {
  border-color: var(--primary-color);
}

.lang-switcher select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* ===========================
   Main Content Area
   =========================== */
.main-content {
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-xl);
  background-color: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.content-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.content-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: var(--spacing-sm);
}

.content-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
}

/* ===========================
   Network Grid System (Modern Card Layout)
   =========================== */
.network-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

/* ===========================
   Network Card Component
   =========================== */
.network-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.network-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.network-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  opacity: 0;
  transition: opacity var(--transition);
}

.network-card:hover::before {
  opacity: 1;
}

/* Card Header */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-color);
  margin: 0;
  line-height: 1.3;
}

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

.card-title a:hover {
  color: var(--primary-color);
}

.card-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--bg-highlight);
  color: var(--primary-color);
}

/* Card Body */
.card-description {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.card-url {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.card-url::before {
  content: "🔗";
  font-size: 0.9em;
}

/* Card Actions */
.card-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

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

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

.btn-success:hover {
  background: var(--secondary-dark);
}

/* Expert Review Block (E-E-A-T) */
.expert-take {
  background: var(--bg-highlight);
  padding: var(--spacing-md);
  margin-top: var(--spacing-md);
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  border-left: 3px solid var(--primary-color);
}

.expert-take strong {
  color: var(--primary-dark);
}

/* ===========================
   Category Section (Legacy Support)
   =========================== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.category {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
}

.category:hover {
  box-shadow: var(--shadow-md);
}

.category-header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: 0;
}

.category-content {
  padding: var(--spacing-lg);
}

/* Affiliate List (Legacy) */
.affiliate-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.affiliate-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

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

.affiliate-item:hover {
  background-color: var(--bg-color);
  border-radius: var(--radius);
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.affiliate-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-color);
  margin: 0 0 var(--spacing-xs);
  transition: color var(--transition);
}

.affiliate-item:hover .affiliate-title {
  color: var(--primary-color);
}

.affiliate-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--spacing-xs);
}

.affiliate-url {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

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

/* ===========================
   Footer Styles
   =========================== */
.footer {
  background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
  color: #ecf0f1;
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-2xl);
  box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  margin-bottom: var(--spacing-md);
  color: #ecf0f1;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.footer-section p {
  color: #bdc3c7;
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.footer-links a {
  color: #bdc3c7;
  text-decoration: none;
  transition: color var(--transition);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: var(--font-size-sm);
  color: #95a5a6;
}

/* ===========================
   Statistics Bar
   =========================== */
.stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-2xl);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--bg-color), var(--bg-white));
  border-radius: var(--radius);
  margin-bottom: var(--spacing-xl);
}

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

.stat-number {
  display: block;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ===========================
   Responsive Design
   =========================== */

/* Large screens */
@media (max-width: 1200px) {
  .category-grid,
  .network-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

/* Tablets */
@media (max-width: 992px) {
  .category-grid,
  .network-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .header {
    padding: var(--spacing-md) 0;
  }

  .content-title {
    font-size: var(--font-size-2xl);
  }
}

/* Mobile landscape */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .nav-menu {
    order: 2;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .search-box {
    margin: var(--spacing-md) 0;
    max-width: 100%;
  }

  .category-grid,
  .network-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .main-content {
    margin: var(--spacing-md) auto;
    padding: var(--spacing-md);
  }

  .stats {
    flex-wrap: wrap;
    gap: var(--spacing-lg);
  }
}

/* Mobile portrait */
@media (max-width: 576px) {
  .logo {
    font-size: var(--font-size-xl);
  }

  .content-title {
    font-size: var(--font-size-xl);
    padding: var(--spacing-md);
  }

  .network-card {
    padding: var(--spacing-md);
  }

  .card-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

/* Extra small screens */
@media (max-width: 400px) {
  .main-content {
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  .logo {
    font-size: var(--font-size-lg);
  }

  .affiliate-desc,
  .card-description {
    font-size: var(--font-size-sm);
  }
}

/* Print styles */
@media print {
  .header {
    background: none;
    border-bottom: 2px solid #000;
    position: static;
  }

  .btn,
  .search-box,
  .lang-switcher {
    display: none;
  }

  .network-card,
  .category {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.animate-slide-in {
  animation: slideIn 0.5s ease forwards;
}

/* Stagger animation for grid items */
.network-grid > *:nth-child(1) { animation-delay: 0.05s; }
.network-grid > *:nth-child(2) { animation-delay: 0.1s; }
.network-grid > *:nth-child(3) { animation-delay: 0.15s; }
.network-grid > *:nth-child(4) { animation-delay: 0.2s; }
.network-grid > *:nth-child(5) { animation-delay: 0.25s; }
.network-grid > *:nth-child(6) { animation-delay: 0.3s; }

/* ===========================
   Utility Classes
   =========================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.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); }

.mt-0 { margin-top: 0; }
.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); }

.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}