/* ============================================
   PIXEL ARCADE — Main Stylesheet
   ============================================ */

:root {
  --bg-deep:      #08080f;
  --bg-card:      #111120;
  --bg-card-hover:#16162a;
  --border:       #1e1e38;
  --border-hover: #3b3b6e;
  --purple:       #7c3aed;
  --purple-light: #9f67ff;
  --cyan:         #06b6d4;
  --cyan-light:   #67e8f9;
  --green:        #10b981;
  --orange:       #f59e0b;
  --red:          #ef4444;
  --text-primary: #f1f5f9;
  --text-muted:   #94a3b8;
  --text-dim:     #475569;
  --radius-sm:    8px;
  --radius-md:    14px;
  --radius-lg:    20px;
  --shadow-card:  0 4px 24px rgba(0,0,0,.45);
  --shadow-glow:  0 0 32px rgba(124,58,237,.25);
  --font-head:    'Exo 2', 'Segoe UI', sans-serif;
  --font-body:    'Inter', 'Segoe UI', sans-serif;
  --transition:   .22s cubic-bezier(.4,0,.2,1);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
}
img, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ---- Typography ---- */
h1,h2,h3,h4 { font-family: var(--font-head); line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2rem,5vw,3.5rem); }
h2 { font-size: clamp(1.5rem,3.5vw,2.25rem); }
h3 { font-size: 1.15rem; }
p  { color: var(--text-muted); }

/* ---- Layout ---- */
.container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.section { padding: 72px 0; }

/* ============================
   HEADER / NAV
   ============================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8,8,15,.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
}
.logo-icon {
  font-size: 1.7rem;
  line-height: 1;
  filter: drop-shadow(0 0 8px var(--purple));
}
.logo-name { font-size: 1.2rem; font-weight: 800; color: var(--text-primary); }
.logo-sub  { font-size: .7rem; color: var(--text-muted); display: block; }

.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 500;
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--text-primary); background: var(--border); }

.btn-random {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: #fff;
  font-size: .85rem;
  font-weight: 600;
  transition: opacity var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn-random:hover { opacity: .88; transform: translateY(-1px); }

/* ============================
   HERO
   ============================ */
.hero {
  padding: 96px 0 72px;
  text-align: center;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(124,58,237,.18) 0%, transparent 70%);
  pointer-events: none;
}
.hero-eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 18px;
}
.hero h1 {
  background: linear-gradient(135deg, #fff 30%, var(--purple-light) 70%, var(--cyan-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}
.hero-lead { font-size: 1.1rem; max-width: 560px; margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.btn-primary {
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--purple), #5b21b6);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(124,58,237,.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(124,58,237,.55); }

.btn-secondary {
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border-hover);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}
.btn-secondary:hover { border-color: var(--purple); background: rgba(124,58,237,.1); transform: translateY(-2px); }

/* Stats row */
.hero-stats {
  display: flex;
  gap: 36px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 48px;
}
.hero-stat strong { display: block; font-size: 2rem; font-weight: 800; font-family: var(--font-head); color: var(--text-primary); }
.hero-stat span   { font-size: .8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: .08em; }

/* ============================
   FILTER CHIPS
   ============================ */
.library-section { padding: 0 0 72px; }
.library-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.library-title { font-size: 1.6rem; }
.filter-chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  padding: 7px 16px;
  border-radius: 100px;
  font-size: .82rem;
  font-weight: 600;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  background: transparent;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.chip:hover    { border-color: var(--purple); color: var(--text-primary); }
.chip.active   { border-color: var(--purple); background: rgba(124,58,237,.18); color: var(--purple-light); }

/* ============================
   GAME CARDS
   ============================ */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.game-card {
  position: relative;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--transition), background var(--transition),
              transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
  cursor: pointer;
}
.game-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--purple) 0%, var(--cyan) 100%);
  opacity: 0;
  transition: opacity var(--transition);
}
.game-card:hover {
  border-color: var(--purple);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.game-card:hover::before { opacity: .06; }
.game-card * { position: relative; z-index: 1; }

.card-badge {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
  width: fit-content;
}
.badge-classic { background: rgba(124,58,237,.2);  color: var(--purple-light); }
.badge-action  { background: rgba(239,68,68,.18);   color: #fca5a5; }
.badge-brain   { background: rgba(16,185,129,.18);  color: #6ee7b7; }
.badge-puzzle  { background: rgba(245,158,11,.18);  color: #fcd34d; }

.card-icon {
  font-size: 2.4rem;
  line-height: 1;
  margin: 4px 0;
  transition: transform var(--transition);
}
.game-card:hover .card-icon { transform: scale(1.12); }

.game-card h3 { font-size: 1.05rem; color: var(--text-primary); }
.game-card p  { font-size: .85rem; color: var(--text-muted); flex: 1; }

.card-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--purple-light);
  margin-top: 6px;
  transition: gap var(--transition);
}
.game-card:hover .card-cta { gap: 10px; }
.card-cta::after { content: '→'; }

/* ============================
   GAME PAGE LAYOUT
   ============================ */
.game-page-header {
  padding: 28px 0 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  color: var(--text-muted);
  padding: 6px 0;
  transition: color var(--transition);
}
.back-link:hover { color: var(--text-primary); }
.back-link::before { content: '←'; }

/* Game wrapper */
.game-section {
  padding: 36px 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.game-title {
  text-align: center;
  font-size: clamp(1.5rem,4vw,2.2rem);
}
.game-area {
  position: relative;
  background: #0d0d1e;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card), 0 0 40px rgba(124,58,237,.15);
}
.game-canvas { display: block; }

/* HUD */
.game-hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 520px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-head);
  font-size: .9rem;
  flex-wrap: wrap;
  gap: 8px;
}
.hud-item { display: flex; align-items: center; gap: 6px; }
.hud-label { color: var(--text-muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; }
.hud-value { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); }

/* Controls info */
.controls-info {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
  font-size: .82rem;
  color: var(--text-muted);
}
.controls-info span { display: flex; align-items: center; gap: 5px; }
.key {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid var(--border-hover);
  border-radius: 4px;
  background: var(--bg-card);
  font-family: var(--font-head);
  font-size: .75rem;
  color: var(--text-primary);
}

/* Game overlay */
.game-overlay {
  position: absolute;
  inset: 0;
  background: rgba(8,8,15,.88);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  text-align: center;
  padding: 24px;
  transition: opacity .3s;
}
.game-overlay.hidden { display: none; }
.overlay-title { font-size: 1.8rem; font-family: var(--font-head); color: var(--text-primary); }
.overlay-score { font-size: 1.1rem; color: var(--text-muted); }
.overlay-score strong { color: var(--purple-light); font-size: 1.4rem; }
.btn-play {
  padding: 12px 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-head);
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(124,58,237,.4);
  border: none;
  cursor: pointer;
}
.btn-play:hover { transform: translateY(-2px) scale(1.04); box-shadow: 0 8px 32px rgba(124,58,237,.55); }

/* Touch controls */
.touch-controls {
  display: none;
  gap: 10px;
  flex-direction: column;
  align-items: center;
  margin-top: 4px;
}
.touch-row { display: flex; gap: 10px; }
.touch-btn {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1.5px solid var(--border-hover);
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: background var(--transition), transform .1s;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}
.touch-btn:active { background: rgba(124,58,237,.3); transform: scale(.93); }
@media (pointer: coarse) { .touch-controls { display: flex; } }

/* ============================
   ARTICLE / SEO CONTENT
   ============================ */
.article-section { padding: 60px 0 80px; }
.article-inner { max-width: 780px; margin: 0 auto; }
.article-inner h2 { font-size: 1.5rem; margin: 36px 0 12px; color: var(--text-primary); }
.article-inner h3 { font-size: 1.1rem; margin: 24px 0 8px; color: var(--purple-light); }
.article-inner p  { margin-bottom: 14px; line-height: 1.75; }
.article-inner ul { padding-left: 20px; margin-bottom: 14px; }
.article-inner ul li { list-style: disc; color: var(--text-muted); margin-bottom: 6px; line-height: 1.65; }
.article-inner strong { color: var(--text-primary); }
.article-inner .article-lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  border-left: 3px solid var(--purple);
  padding-left: 16px;
  margin-bottom: 32px;
}

/* FAQ */
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 10px; overflow: hidden; }
.faq-q {
  width: 100%;
  text-align: left;
  padding: 15px 18px;
  font-size: .95rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-card);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: background var(--transition);
}
.faq-q:hover { background: var(--bg-card-hover); }
.faq-q::after { content: '+'; font-size: 1.2rem; color: var(--purple-light); flex-shrink: 0; transition: transform var(--transition); }
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a {
  display: none;
  padding: 0 18px 15px;
  font-size: .9rem;
  color: var(--text-muted);
  background: var(--bg-card);
  line-height: 1.7;
}
.faq-item.open .faq-a { display: block; }

/* ============================
   FOOTER
   ============================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  text-align: center;
}
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.footer-logo  { font-family: var(--font-head); font-size: 1.1rem; font-weight: 800; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.footer-links a { font-size: .85rem; color: var(--text-muted); transition: color var(--transition); }
.footer-links a:hover { color: var(--text-primary); }
.footer-copy  { font-size: .78rem; color: var(--text-dim); }

/* ============================
   MEMORY MATCH SPECIFIC
   ============================ */
.memory-grid {
  display: grid;
  grid-template-columns: repeat(4, 80px);
  gap: 12px;
  padding: 24px;
}
.mem-card {
  width: 80px;
  height: 80px;
  perspective: 600px;
  cursor: pointer;
}
.mem-card-inner {
  width: 100%; height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform .45s cubic-bezier(.4,0,.2,1);
  border-radius: var(--radius-sm);
}
.mem-card.flipped .mem-card-inner { transform: rotateY(180deg); }
.mem-card.matched .mem-card-inner { transform: rotateY(180deg); }
.mem-card.matched .mem-front { border-color: var(--green); box-shadow: 0 0 12px rgba(16,185,129,.4); }
.mem-front, .mem-back {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mem-back {
  background: var(--bg-card);
  border: 1.5px solid var(--border-hover);
  font-size: 1.8rem;
  transition: transform .1s;
}
.mem-back:hover { transform: scale(1.04); }
.mem-front {
  background: linear-gradient(135deg, #1a1a38, #0d0d1e);
  border: 1.5px solid var(--border);
  transform: rotateY(180deg);
  font-size: 1.6rem;
}

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 700px) {
  .nav-links { display: none; }
  .hero { padding: 56px 0 48px; }
  .games-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }
  .game-canvas { width: 100% !important; height: auto !important; }
  .memory-grid { grid-template-columns: repeat(4, 68px); gap: 8px; padding: 16px; }
  .mem-card { width: 68px; height: 68px; }
}
@media (max-width: 480px) {
  .memory-grid { grid-template-columns: repeat(4, 58px); gap: 6px; padding: 12px; }
  .mem-card { width: 58px; height: 58px; }
  .mem-front, .mem-back { font-size: 1.3rem; }
}

/* Scroll reveal utility */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .5s ease, transform .5s ease; }
.reveal.visible { opacity: 1; transform: none; }