/* ===================================
   ENIAC KIDS - MAIN STYLESHEET
   kids.eniac.com.tr
   =================================== */

/* COLOR PALETTE (from logo/banner) */
:root {
  /* Primary Colors */
  --color-cyan: #5BC8E8;
  --color-blue: #4FB3D4;
  --color-yellow: #F4B740;
  --color-orange: #E87E3C;
  --color-pink: #E89BB5;
  --color-gold: #FFD966;
  
  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-cream: #FFF9F0;
  --color-light-gray: #F5F5F5;
  --color-gray: #666666;
  --color-dark: #333333;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-cyan) 0%, var(--color-blue) 100%);
  --gradient-warm: linear-gradient(135deg, var(--color-yellow) 0%, var(--color-orange) 100%);
  --gradient-soft: linear-gradient(135deg, var(--color-pink) 0%, var(--color-gold) 100%);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 50%;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */

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

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

body {
  font-family: 'Nunito', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: var(--color-dark);
  background: var(--color-cream);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===================================
   TYPOGRAPHY
   =================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: 2.5rem;
  color: var(--color-cyan);
}

h2 {
  font-size: 2rem;
  color: var(--color-blue);
}

h3 {
  font-size: 1.5rem;
  color: var(--color-yellow);
}

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

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

a:hover {
  color: var(--color-blue);
}

/* ===================================
   LAYOUT
   =================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

/* ===================================
   HEADER & NAVIGATION
   =================================== */

.header {
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--spacing-sm) 0;
}

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

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo {
  height: 80px;
  width: auto;
  transition: transform var(--transition-normal);
}

.logo:hover {
  transform: scale(1.05);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
  align-items: center;
}

.nav-link {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
}

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

.subscribe-btn {
  background: var(--gradient-warm);
  color: var(--color-white);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-lg);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--color-cyan);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
  background: var(--gradient-primary);
  padding: var(--spacing-xxl) 0;
  text-align: center;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  min-height: 400px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('../images/banner.png') center/cover no-repeat;
  opacity: 0.2;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 3rem;
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* ===================================
   FILTER SECTION
   =================================== */

.filter-section {
  background: var(--color-white);
  padding: var(--spacing-lg) 0;
  box-shadow: var(--shadow-sm);
}

.filter-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
  justify-content: center;
}

.filter-group {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.filter-label {
  font-weight: 600;
  color: var(--color-gray);
}

.filter-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  border: 2px solid var(--color-cyan);
  background: var(--color-white);
  color: var(--color-cyan);
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-cyan);
  color: var(--color-white);
  transform: translateY(-2px);
}

.search-box {
  display: flex;
  gap: var(--spacing-xs);
  max-width: 400px;
}

.search-input {
  flex: 1;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 2px solid var(--color-light-gray);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-cyan);
}

.search-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--gradient-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-normal);
}

.search-btn:hover {
  transform: scale(1.05);
}

/* ===================================
   VIDEO GRID
   =================================== */

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

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xxl);
}

.video-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.video-thumbnail {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  background: var(--color-light-gray);
}

.video-info {
  padding: var(--spacing-md);
}

.video-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-dark);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: var(--spacing-sm);
  font-size: 0.9rem;
  color: var(--color-gray);
}

.video-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: var(--spacing-xs);
}

.badge-0-6 {
  background: var(--color-pink);
  color: var(--color-white);
}

.badge-4-10 {
  background: var(--color-cyan);
  color: var(--color-white);
}

/* ===================================
   PLAYLIST SECTION
   =================================== */

.playlist-section {
  background: var(--color-light-gray);
  padding: var(--spacing-xxl) 0;
}

.playlist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.playlist-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

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

.playlist-thumbnail {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.playlist-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.playlist-count {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.8);
  color: var(--color-white);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
}

.playlist-info {
  padding: var(--spacing-md);
}

.playlist-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--color-dark);
}

.playlist-description {
  color: var(--color-gray);
  font-size: 0.9rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===================================
   FOOTER
   =================================== */

.footer {
  background: var(--color-dark);
  color: var(--color-white);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-section h3 {
  color: var(--color-yellow);
  margin-bottom: var(--spacing-md);
}

.footer-links {
  list-style: none;
}

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

.footer-links a {
  color: var(--color-white);
  transition: color var(--transition-fast);
}

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

.social-links {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.social-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-white);
  color: var(--color-dark);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.social-icon:hover {
  background: var(--gradient-primary);
  color: var(--color-white);
  transform: scale(1.1);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-gray);
}

/* ===================================
   LOADING & EMPTY STATES
   =================================== */

.loading {
  text-align: center;
  padding: var(--spacing-xxl) 0;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--color-light-gray);
  border-top-color: var(--color-cyan);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-state {
  text-align: center;
  padding: var(--spacing-xxl) 0;
  color: var(--color-gray);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-light-gray);
}

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

@media (max-width: 768px) {
  /* Typography */
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  /* Navigation */
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  /* Grid adjustments */
  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
  }
  
  .playlist-grid {
    grid-template-columns: 1fr;
  }
  
  /* Spacing */
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .video-section,
  .playlist-section {
    padding: var(--spacing-xl) 0;
  }
}

@media (max-width: 480px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
  
  .filter-container {
    flex-direction: column;
  }
  
  .search-box {
    width: 100%;
    max-width: none;
  }
}

/* ===================================
   UTILITY CLASSES
   =================================== */

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

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

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

.hidden {
  display: none;
}

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

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