/**
 * Dark Theme Stylesheet
 * SEO Optimized Video Streaming Platform
 * Performance: Lightweight, minimal CSS
 */

/* ============================================
   VARIABLES & RESET
   ============================================ */
:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #121212;
  --surface: #1c1c1c;
  --surface-light: #1e1e1e;
  --text-primary: #ffffff;
  --text-muted: #b3b3b3;
  --accent: #ff0000;
  --accent-hover: #e50914;
  --border-color: #2a2a2a;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.875rem;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.5rem;
}

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

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

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

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

html,
body {
  height: 100%;
  display: flex;
  flex-direction: column;
}

body {
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  background: linear-gradient(
    to bottom,
    var(--bg-primary),
    var(--bg-secondary)
  );
  padding: var(--spacing-lg) 0;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo a {
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: color var(--transition-fast);
}

.logo a:hover {
  color: var(--accent);
}

.logo-text {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--text-primary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width var(--transition-fast);
}

.nav-links a:hover::after {
  width: 100%;
}

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

.video-card {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.video-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(255, 0, 0, 0.15);
  border-color: var(--accent);
}

.video-thumbnail {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  background-color: var(--bg-secondary);
  overflow: hidden;
}

.video-thumbnail img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.video-card:hover .video-thumbnail img {
  transform: scale(1.05);
}

.video-play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background-color: rgba(255, 0, 0, 0.8);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  transition: background-color var(--transition-fast),
    transform var(--transition-fast);
  z-index: 2;
}

.video-card:hover .video-play-icon {
  background-color: var(--accent);
  transform: translate(-50%, -50%) scale(1.1);
}

.video-info {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.video-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-description {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

/* ============================================
   VIDEO PLAYER PAGE
   ============================================ */
.video-player-container {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  border: 1px solid var(--border-color);
}

.video-player-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%;
  margin-bottom: var(--spacing-lg);
  background-color: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.video-player-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--radius-md);
}

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

.video-metadata h1 {
  color: var(--text-primary);
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  word-break: break-word;
}

.video-metadata p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
}

/* ============================================
   HERO SECTION (HOME PAGE)
   ============================================ */
.hero {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-xl) 0;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--accent), #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
}

.empty-state h2 {
  margin-bottom: var(--spacing-md);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  text-align: center;
  margin-top: auto;
}

.footer p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.footer-tagline {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ============================================
   CATEGORY PAGES
   ============================================ */
.category-hero {
  background: linear-gradient(135deg, var(--bg-secondary), var(--surface));
  padding: var(--spacing-xl) var(--spacing-md);
  border-bottom: 2px solid var(--border-color);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.category-hero h1 {
  color: var(--text-primary);
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.category-hero p {
  color: var(--text-muted);
  font-size: 1.125rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   PAGINATION
   ============================================ */
.pagination-section {
  padding: var(--spacing-lg) var(--spacing-md);
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-xl);
}

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

.pagination-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-fast);
  min-width: 44px;
  text-align: center;
}

.pagination-link:hover {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
  transform: translateY(-2px);
}

.pagination-info {
  color: var(--text-muted);
  font-size: 0.95rem;
  padding: 0 var(--spacing-sm);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--accent);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition-fast);
  border: 1px solid var(--accent);
  text-align: center;
  cursor: pointer;
}

.btn:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(255, 0, 0, 0.2);
}

.btn:active {
  transform: translateY(0);
}

/* ============================================
   LOADING STATES
   ============================================ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--surface) 25%,
    var(--surface-light) 50%,
    var(--surface) 75%
  );
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .category-hero h1 {
    font-size: 1.75rem;
  }

  .category-hero p {
    font-size: 1rem;
  }

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
  }

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

  .nav-links {
    gap: var(--spacing-md);
  }

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

  .video-metadata h1 {
    font-size: 1.5rem;
  }

  .pagination {
    gap: var(--spacing-sm);
  }

  .pagination-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.9rem;
    min-width: 40px;
  }

  .pagination-info {
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.75rem;
  }

  .category-hero h1 {
    font-size: 1.5rem;
  }

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing-sm);
  }

  .hero {
    padding: var(--spacing-lg) 0;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .nav-links {
    gap: var(--spacing-sm);
    font-size: 0.9rem;
  }

  .pagination {
    gap: var(--spacing-xs);
  }

  .pagination-link {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    min-width: 36px;
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.95rem;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-color-scheme: light) {
  /* Fallback: force dark theme */
  :root {
    color-scheme: dark;
  }
}

/* Focus states for keyboard navigation */
a:focus,
button:focus,
input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .header,
  .footer,
  .nav-links {
    display: none;
  }
}