/* ================================================================
   style.css — Open Games Hub
   Retro-Futurism Gaming (UI/UX Pro Max)
   ================================================================ */

/* ── Design Tokens ── */
:root {
  --color-bg:        #12131C;
  --color-surface:   #1F2937;
  --color-surface2:  #2D2015;
  --color-primary:   #F97316;
  --color-primary2:  #FB923C;
  --color-cta:       #22C55E;
  --color-success:   #22C55E;
  --color-text:      #F8FAFC;
  --color-text-dim:  #9CA3AF;
  --color-border:    #C2410C;
  --color-glow:      rgba(249, 115, 22, 0.35);
  --color-border:    #C2410C;
  --color-glow:      rgba(249, 115, 22, 0.4);

  --font-heading: 'Fredoka', system-ui, sans-serif;
  --font-body:    'Nunito', system-ui, sans-serif;

  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --z-header:  50;
  --z-overlay: 30;
  --z-dropdown:20;
  --z-card:    10;

  --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast:  150ms;
  --duration-normal:250ms;
  --duration-slow:  400ms;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100dvh;
  position: relative;
}
body::before {
  content: '';
  position: fixed; inset: 0; z-index: var(--z-overlay);
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
}

a { color: var(--color-primary2); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible {
  outline: 3px solid var(--color-primary2);
  outline-offset: 2px;
}
img { max-width: 100%; height: auto; display: block; }
::selection { background: var(--color-primary); color: #fff; }

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ── Header ── */
.header {
  position: sticky; top: 0; z-index: var(--z-header);
  background: rgba(15,15,35,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(249,115,22,0.2);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.header-logo {
  display: flex; align-items: center; gap: var(--space-sm);
  font-family: var(--font-heading); font-size: 22px; font-weight: 700;
  color: var(--color-text);
}
.header-logo .logo-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; color: #fff;
}
.header-stats {
  display: flex; gap: var(--space-lg);
  font-size: 14px; color: var(--color-text-dim);
  font-family: var(--font-heading);
}
.header-stats strong { color: var(--color-primary2); }

/* ── Hero ── */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
  position: relative;
}
.hero::after {
  content: '';
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 600px; max-width: 100vw; height: 400px;
  background: radial-gradient(ellipse, var(--color-glow) 0%, transparent 70%);
  pointer-events: none; z-index: -1;
}
.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(36px, 8vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
  text-shadow: 0 0 40px var(--color-glow), 0 0 80px rgba(249,115,22,0.2);
}
.hero-title .accent { color: var(--color-primary2); }
.hero-sub {
  margin-top: var(--space-md);
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--color-text-dim);
  max-width: 560px; margin-left: auto; margin-right: auto;
}

/* ── Search & Filter ── */
.toolbar {
  display: flex; flex-wrap: wrap; gap: var(--space-md);
  align-items: center; justify-content: center;
  padding-bottom: var(--space-2xl);
}
.search-wrap {
  position: relative; flex: 1; min-width: 260px; max-width: 480px;
}
.search-input {
  width: 100%; height: 48px; padding: 0 var(--space-lg) 0 48px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  font-family: var(--font-body); font-size: 16px;
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}
.search-input::placeholder { color: var(--color-text-dim); }
.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 20px var(--color-glow);
}
.search-icon {
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  width: 20px; height: 20px; color: var(--color-text-dim); pointer-events: none;
}

/* ── Tag Chips ── */
.tag-chips {
  display: flex; flex-wrap: wrap; gap: var(--space-sm);
  justify-content: center;
}
.tag-chip {
  padding: 6px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text-dim);
  font-size: 14px; font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  user-select: none;
}
.tag-chip:hover {
  border-color: var(--color-primary2);
  color: var(--color-text);
}
.tag-chip.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 0 12px var(--color-glow);
}
.tag-chip--all { border-color: var(--color-cta); color: var(--color-cta); }
.tag-chip--all.active { background: var(--color-cta); border-color: var(--color-cta); color: #fff; }

/* ── Platform Filter ── */
.platform-filter {
  display: flex; flex-wrap: wrap; gap: var(--space-sm);
  justify-content: center; align-items: center;
  padding-bottom: var(--space-2xl);
}
.platform-label {
  font-size: 14px; color: var(--color-text-dim);
  font-family: var(--font-heading); margin-right: var(--space-xs);
}
.platform-chip {
  padding: 6px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text-dim);
  font-size: 14px; font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  user-select: none;
}
.platform-chip:hover { border-color: var(--color-primary2); color: var(--color-text); }
.platform-chip.active {
  background: var(--color-success);
  border-color: var(--color-success);
  color: #fff;
  box-shadow: 0 0 12px rgba(34,197,94,0.3);
}

/* ── Platform Badge trên card ── */
.platform-badge {
  position: absolute; bottom: 8px; left: 8px;
  padding: 2px 8px;
  background: rgba(0,0,0,0.7);
  border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 600;
  font-family: var(--font-heading);
  display: flex; align-items: center; gap: 3px;
}
.platform--mobile { color: #38BDF8; }
.platform--pc     { color: #FB923C; }
.platform--both   { color: #22C55E; }

/* ── Game Grid ── */
.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  padding-bottom: var(--space-3xl);
}
.game-card {
  position: relative; z-index: var(--z-card);
  background: var(--color-surface);
  border: 1px solid rgba(249,115,22,0.15);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
  cursor: pointer;
}
.game-card:hover, .game-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: 0 8px 32px rgba(249,115,22,0.25), 0 0 60px rgba(249,115,22,0.08);
}
.game-card:active { transform: scale(0.98); }

/* ── Thumbnail ── */
.game-thumb {
  position: relative; aspect-ratio: 16/10;
  background: var(--color-surface2);
  overflow: hidden;
}
.game-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}
.game-card:hover .game-thumb img { transform: scale(1.05); }
.game-thumb .placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--color-surface), var(--color-surface2));
  color: var(--color-text-dim);
  font-size: 48px;
}
.game-thumb .must-h-badge {
  position: absolute; bottom: 8px; right: 8px;
  padding: 2px 8px;
  background: rgba(0,0,0,0.7);
  border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 600; color: var(--color-cta);
  font-family: var(--font-heading);
  display: flex; align-items: center; gap: 4px;
}

/* ── Card Info ── */
.game-info { padding: var(--space-md); }
.game-title {
  font-family: var(--font-heading);
  font-size: 18px; font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  display: -webkit-box;
  -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.game-author {
  font-size: 13px; color: var(--color-primary2);
  margin-bottom: var(--space-sm);
  display: flex; align-items: center; gap: 6px;
}
.game-desc {
  font-size: 14px; color: var(--color-text-dim);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.game-tags {
  display: flex; flex-wrap: wrap; gap: var(--space-xs);
  margin-top: var(--space-sm);
}
.game-tag {
  padding: 2px 10px;
  background: rgba(249,115,22,0.15);
  border-radius: var(--radius-sm);
  font-size: 11px; font-weight: 500;
  color: var(--color-primary2);
  font-family: var(--font-heading);
}

/* ── Skeleton Loading ── */
.skeleton-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-lg); }
.skeleton-card {
  background: var(--color-surface); border-radius: var(--radius-lg); overflow: hidden;
}
.skeleton-thumb {
  aspect-ratio: 16/10; background: var(--color-surface2);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}
.skeleton-body { padding: var(--space-md); }
.skeleton-line {
  height: 14px; border-radius: 4px; background: var(--color-surface2);
  margin-bottom: var(--space-sm);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}
.skeleton-line--title  { width: 70%; height: 18px; }
.skeleton-line--author { width: 45%; }
.skeleton-line--desc   { width: 90%; }
.skeleton-line--desc2  { width: 60%; }
@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ── Empty State ── */
.empty-state {
  display: none; flex-direction: column; align-items: center;
  padding: var(--space-3xl) var(--space-lg);
  text-align: center;
}
.empty-state.visible { display: flex; }
.empty-icon { font-size: 64px; margin-bottom: var(--space-lg); opacity: 0.5; }
.empty-title {
  font-family: var(--font-heading); font-size: 24px;
  color: var(--color-text); margin-bottom: var(--space-sm);
}
.empty-desc { color: var(--color-text-dim); max-width: 400px; }

/* ── Footer ── */
.footer {
  border-top: 1px solid rgba(249,115,22,0.2);
  padding: var(--space-xl) 0;
  text-align: center; color: var(--color-text-dim); font-size: 14px;
}
.footer a { color: var(--color-primary2); }

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  body::before { display: none; }
}

/* ── Responsive ── */
@media (max-width: 480px) {
  .header-stats { display: none; }
  .game-grid { grid-template-columns: 1fr; }
  .toolbar { flex-direction: column; }
  .search-wrap { max-width: 100%; }
  .tag-chips { justify-content: flex-start; }
}

/* ── Filter Bar (selection dropdowns) ── */
.filter-bar {
  display: flex; flex-wrap: wrap; gap: var(--space-md);
  align-items: center; justify-content: center;
  padding-bottom: var(--space-2xl);
}
.filter-select {
  height: 48px; padding: 0 16px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  color: var(--color-text);
  font-family: var(--font-body); font-size: 14px;
  cursor: pointer; outline: none;
  transition: border-color var(--duration-fast) var(--ease-out);
  min-width: 160px;
}
.filter-select:focus { border-color: var(--color-primary); box-shadow: 0 0 12px var(--color-glow); }
.filter-select option { background: var(--color-surface); color: var(--color-text); }

/* ── Load More ── */
.load-more-wrap { text-align: center; padding-bottom: var(--space-3xl); }
.btn-load-more {
  padding: 12px 32px;
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-xl);
  color: var(--color-primary2);
  font-family: var(--font-heading); font-size: 16px; font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}
.btn-load-more:hover { background: var(--color-primary); color: #fff; box-shadow: 0 0 20px var(--color-glow); }

/* ── How-to Section ── */
.howto {
  padding: var(--space-3xl) 0;
  border-top: 1px solid rgba(249,115,22,0.15);
  background: var(--color-surface);
}
.howto-title {
  font-family: var(--font-heading); font-size: 28px; font-weight: 700;
  text-align: center; margin-bottom: var(--space-2xl); color: var(--color-text);
}
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-lg);
}
.step {
  background: var(--color-surface2);
  border: 1px solid rgba(249,115,22,0.1);
  border-radius: var(--radius-lg); padding: var(--space-lg);
  text-align: center;
  transition: transform var(--duration-fast) var(--ease-out);
}
.step:hover { transform: translateY(-2px); border-color: var(--color-primary); }
.step-num {
  width: 40px; height: 40px; margin: 0 auto var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary), var(--color-cta));
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading); font-size: 20px; font-weight: 700; color: #fff;
}
.step h3 { font-family: var(--font-heading); font-size: 16px; margin-bottom: var(--space-xs); color: var(--color-text); }
.step p { font-size: 13px; color: var(--color-text-dim); line-height: 1.5; }
.step code {
  padding: 2px 6px; background: rgba(249,115,22,0.2);
  border-radius: 4px; font-size: 12px; color: var(--color-primary2);
}
.howto-cta { text-align: center; margin-top: var(--space-2xl); font-size: 15px; }
.howto-cta a { color: var(--color-primary2); font-weight: 600; }

/* ── Contributors ── */
.contributors { padding: var(--space-3xl) 0; border-top: 1px solid rgba(249,115,22,0.15); }
.contrib-grid { display: flex; flex-wrap: wrap; gap: var(--space-lg); justify-content: center; }
.contrib-item { position: relative; }
.contrib-avatar {
  width: 64px; height: 64px; border-radius: 50%;
  border: 3px solid var(--color-primary);
  transition: transform .2s, box-shadow .2s;
  cursor: pointer;
}
.contrib-item:hover .contrib-avatar {
  transform: scale(1.15);
  box-shadow: 0 0 20px var(--color-glow);
}
.contrib-tooltip {
  display: none; position: absolute; bottom: 100%; left: 50%;
  transform: translateX(-50%); margin-bottom: 8px;
  background: var(--color-surface2); border: 1px solid var(--color-primary);
  border-radius: var(--radius-md); padding: 10px 14px;
  white-space: nowrap; z-index: 60; text-align: center;
  font-family: var(--font-body); font-size: 13px; color: var(--color-text);
  min-width: 180px;
}
.contrib-item:hover .contrib-tooltip { display: block; }
.contrib-tooltip strong { color: var(--color-primary2); display: block; margin-bottom: 4px; font-family: var(--font-heading); }
.contrib-tooltip ul { list-style: none; padding: 0; margin: 4px 0 0; }
.contrib-tooltip li { font-size: 12px; color: var(--color-text-dim); line-height: 1.6; }
.contrib-tooltip li::before { content: '🎮 '; font-size: 10px; }