/* ============================================================
   PlayUnblocked - Puzzle & 2-Player Games Hub
   Dark Sci-Fi / Game Mode Theme
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --bg-deep: #121214;
  --bg-card: #1a1a1f;
  --bg-card-hover: #22222a;
  --bg-nav: rgba(18, 18, 20, 0.92);
  --border-subtle: #2a2a32;
  --border-active: #39d353;
  --text-primary: #e8e8ed;
  --text-secondary: #9d9da8;
  --text-muted: #6b6b78;
  --accent-green: #39d353;
  --accent-purple: #8a2be2;
  --accent-blue: #4895ef;
  --accent-orange: #f77f00;
  --accent-cyan: #00b4d8;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.4), 0 2px 12px rgba(0,0,0,0.2);
  --shadow-card-hover: 0 4px 24px rgba(57, 211, 83, 0.12), 0 8px 40px rgba(0,0,0,0.3);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
  font-size: inherit;
}

input {
  font-family: inherit;
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.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;
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-green), #1db954);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* --- Hero --- */
.hero {
  padding: 72px 0 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(57, 211, 83, 0.06) 0%, transparent 70%),
              radial-gradient(ellipse at 70% 30%, rgba(138, 43, 226, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  position: relative;
}

.hero-title .accent {
  background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
}

.hero-search {
  display: flex;
  align-items: center;
  max-width: 480px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 50px;
  padding: 4px 6px 4px 20px;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
}

.hero-search:focus-within {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 3px rgba(57, 211, 83, 0.15);
}

.hero-search input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  padding: 10px 0;
}

.hero-search input::placeholder {
  color: var(--text-muted);
}

.hero-search button {
  background: var(--accent-green);
  color: #000;
  font-weight: 600;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.hero-search button:hover {
  background: #4ade63;
  transform: scale(1.03);
}

/* --- Category Pills --- */
.category-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 48px;
}

.category-pill {
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.category-pill:hover,
.category-pill.active {
  background: rgba(57, 211, 83, 0.1);
  border-color: var(--accent-green);
  color: var(--accent-green);
}

/* --- Section Headers --- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-title span {
  color: var(--accent-green);
}

.section-viewall {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.section-viewall:hover {
  color: var(--accent-green);
  border-color: var(--accent-green);
}

/* --- Game Grid --- */
.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  padding-bottom: 56px;
}

.game-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-normal),
              box-shadow var(--transition-normal),
              border-color var(--transition-normal);
  cursor: pointer;
}

.game-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(57, 211, 83, 0.25);
}

.game-card-thumb {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, #1e1e28, #181820);
}

.game-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.game-card:hover .game-card-thumb img {
  transform: scale(1.08);
}

.game-card-play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.game-card:hover .game-card-play-overlay {
  opacity: 1;
}

.game-card-play-btn {
  width: 52px;
  height: 52px;
  background: var(--accent-green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: #000;
  transform: translateY(8px);
  transition: transform var(--transition-normal);
}

.game-card:hover .game-card-play-btn {
  transform: translateY(0);
}

.game-card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 10px;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: var(--text-primary);
}

.game-card-tag.puzzle  { border-left: 2px solid var(--accent-purple); }
.game-card-tag.twoplayer { border-left: 2px solid var(--accent-green); }
.game-card-tag.board { border-left: 2px solid var(--accent-orange); }
.game-card-tag.classic { border-left: 2px solid var(--accent-cyan); }

.game-card-body {
  padding: 16px;
}

.game-card-body h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.game-card-body .game-card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Loading / Empty States */
.game-card-skeleton {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  animation: pulse 1.5s ease-in-out infinite;
}

.game-card-skeleton .skeleton-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--border-subtle);
}

.game-card-skeleton .skeleton-body {
  padding: 16px;
}

.game-card-skeleton .skeleton-line {
  height: 14px;
  background: var(--border-subtle);
  border-radius: 4px;
  margin-bottom: 8px;
}

.game-card-skeleton .skeleton-line.short {
  width: 60%;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 64px 24px;
  color: var(--text-muted);
}

.no-results .no-results-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.no-results p {
  font-size: 1rem;
}

/* --- Play Page --- */
.play-page {
  flex: 1;
  padding: 40px 0 64px;
}

.play-title-area {
  text-align: center;
  margin-bottom: 32px;
}

.play-breadcrumb {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.play-breadcrumb a {
  transition: color var(--transition-fast);
}

.play-breadcrumb a:hover {
  color: var(--accent-green);
}

.play-breadcrumb .sep {
  margin: 0 8px;
}

.play-title-area h1 {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.game-frame-wrapper {
  position: relative;
  max-width: 900px;
  margin: 0 auto 40px;
  background: #000;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.game-frame-wrapper iframe {
  display: block;
  width: 100%;
  height: 540px;
  border: none;
  background: #0a0a0a;
}

.game-frame-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
}

.game-frame-controls .fullscreen-btn {
  background: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.game-frame-controls .fullscreen-btn:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
}

/* --- Play Info Sections --- */
.play-info-grid {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

@media (max-width: 640px) {
  .play-info-grid {
    grid-template-columns: 1fr;
  }
}

.play-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.play-info-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.play-info-card h2 .icon {
  font-size: 1.2rem;
}

.play-info-card.how-to-play h2 .icon {
  color: var(--accent-green);
}

.play-info-card.game-desc h2 .icon {
  color: var(--accent-cyan);
}

.play-info-card ul {
  padding-left: 18px;
}

.play-info-card ul li {
  list-style: disc;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.play-info-card ul li::marker {
  color: var(--accent-green);
}

.play-info-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Related Games --- */
.related-games {
  max-width: 900px;
  margin: 40px auto 0;
}

.related-games h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.related-games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}

.related-game-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.related-game-card:hover {
  border-color: var(--accent-green);
  transform: translateY(-2px);
}

.related-game-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, #1e1e28, #181820);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.related-game-card h4 {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 10px 12px;
  text-align: center;
}

/* --- FAQ Section --- */
.faq-section {
  padding: 56px 0;
  background: var(--bg-deep);
  border-top: 1px solid var(--border-subtle);
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--accent-green);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '▼';
  font-size: 0.65rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  transform: rotate(180deg);
  color: var(--accent-green);
}

.faq-item p {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* --- Footer --- */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0 24px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 24px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 12px;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul li a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: var(--accent-green);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-social a {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-left: 16px;
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--accent-green);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-nav);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 12px 0;
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    padding: 14px 24px;
    width: 100%;
    border-radius: 0;
  }

  .hero {
    padding: 48px 0 36px;
  }

  .hero-search {
    width: 90%;
  }

  .faq-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }

  .game-frame-wrapper iframe {
    height: 360px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .hero-search {
    flex-direction: column;
    border-radius: var(--radius-md);
    padding: 12px;
    gap: 8px;
  }

  .hero-search input {
    width: 100%;
  }

  .hero-search button {
    width: 100%;
    border-radius: var(--radius-sm);
  }

  .game-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .game-card-body {
    padding: 10px 12px;
  }

  .game-card-body h3 {
    font-size: 0.85rem;
  }

  .game-card-body .game-card-desc {
    display: none;
  }

  .game-frame-wrapper iframe {
    height: 260px;
  }

  .related-games-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}