/* ============================================================================
   REVA — Passe Esthétique Premium — Harmonisée CB-ARCADE Kit Premium
   Palette sémantique riche (vert/noir/blanc premium), glassmorphism avancé.
   Ombres bokeh, animations GPU-optimisées, safe-areas iPhone, RTL arabe.
   Mobile-first, responsive, contraste WCAG AA+, mode clair/sombre cohérent.
   ========================================================================== */
:root {
  /* Palette premium harmonisée avec CB-ARCADE kit-design.css */
  --reva-bg: #0e1219;
  --reva-bg-light: #141a23;
  --reva-felt-primary: #17a34e;
  --reva-felt-secondary: #0d6e3c;
  --reva-accent: #3ae48c;
  --reva-accent-light: #5cf5a8;
  --reva-surface: #1a2029;

  /* CB-ARCADE Premium Tokens */
  --cb-text-primary: #f0f4fa;
  --cb-text-secondary: #8b99b3;
  --cb-text-muted: #5f6b7f;
  --cb-text-on-primary: #ffffff;
  --cb-primary: #38e08b;
  --cb-accent: #3ae48c;
  --cb-glass-bg: rgba(15, 22, 38, 0.7);
  --cb-border-light: rgba(255, 255, 255, 0.08);
  --cb-border-medium: rgba(255, 255, 255, 0.12);
  --cb-overlay-bg: rgba(6, 9, 14, 0.6);
  --cb-overlay-blur: blur(3px);

  /* Ombres bokeh premium multi-tier (amplifiées pour profondeur ultra) */
  --cb-shadow-xs: 0 2px 6px rgba(0, 0, 0, 0.16);
  --cb-shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.20);
  --cb-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.22);
  --cb-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.30);
  --cb-shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.40), 0 10px 20px rgba(56, 224, 139, 0.08);
  --cb-shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.12);

  /* Tokens de design */
  --cb-radius-sm: 8px;
  --cb-radius-md: 12px;
  --cb-radius-lg: 16px;
  --cb-radius-btn: 10px;
  --cb-radius-pill: 999px;

  --cb-space-1: 2px;
  --cb-space-2: 4px;
  --cb-space-3: 6px;
  --cb-space-4: 8px;
  --cb-space-5: 10px;
  --cb-space-6: 12px;
  --cb-space-8: 16px;
  --cb-space-10: 20px;
  --cb-space-16: 32px;

  --cb-gap-sm: 8px;
  --cb-gap-md: 12px;
  --cb-gap-lg: 20px;

  --cb-pad-lg: 16px;

  /* Typographie */
  --cb-font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --cb-font-semibold: 600;
  --cb-font-bold: 700;
  --cb-font-black: 900;

  --cb-text-xs: 0.75rem;
  --cb-text-sm: 0.875rem;
  --cb-text-base: 1rem;
  --cb-heading-xs: 1.25rem;
  --cb-heading-sm: 1.5rem;
  --cb-heading-lg: 2rem;

  --cb-letter-spacing-label: 0.05em;
  --cb-letter-spacing-caps: 0.1em;

  --cb-line-height-normal: 1.5;

  /* Animations */
  --cb-duration-fast: 0.12s;
  --cb-duration-normal: 0.18s;
  --cb-duration-slow: 0.3s;
  --cb-easing-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --cb-easing-bounce: cubic-bezier(0.2, 0.9, 0.3, 1.2);
  --cb-easing-ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Glass & backdrop */
  --cb-glass-blur: blur(12px) saturate(1.20);

  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root {
    --reva-bg: #f8f9fb;
    --reva-bg-light: #f0f3f7;
    --reva-felt-primary: #10b981;
    --reva-felt-secondary: #059669;
    --reva-accent: #34d399;
    --reva-accent-light: #6ee7b7;
    --reva-surface: #e5ebf3;

    --cb-text-primary: #1a2029;
    --cb-text-secondary: #6b7f99;
    --cb-text-muted: #8b99b3;
    --cb-text-on-primary: #ffffff;
    --cb-glass-bg: rgba(248, 249, 251, 0.85);
    --cb-border-light: rgba(91, 140, 255, 0.08);
    --cb-border-medium: rgba(91, 140, 255, 0.12);
    --cb-overlay-bg: rgba(255, 255, 255, 0.6);

    --cb-shadow-xs: 0 2px 6px rgba(26, 38, 43, 0.12);
    --cb-shadow-sm: 0 4px 14px rgba(26, 38, 43, 0.15);
    --cb-shadow-md: 0 8px 24px rgba(26, 38, 43, 0.18);
    --cb-shadow-lg: 0 12px 40px rgba(26, 38, 43, 0.24);
    --cb-shadow-xl: 0 20px 60px rgba(26, 38, 43, 0.32), 0 10px 20px rgba(56, 224, 139, 0.06);
    --cb-shadow-inset: inset 0 1px 0 rgba(91, 140, 255, 0.10);
  }
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background: linear-gradient(135deg, var(--reva-bg) 0%, var(--reva-bg-light) 100%);
  color: var(--cb-text-primary);
  font-family: var(--cb-font-family);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: max(var(--cb-space-8), env(safe-area-inset-top)) var(--cb-space-6) max(var(--cb-space-16), env(safe-area-inset-bottom));
  gap: var(--cb-gap-md);
  -webkit-user-select: none;
  user-select: none;
  overflow-x: hidden;
  transition: background var(--cb-duration-slow) var(--cb-easing-in-out);
  position: relative;
  -webkit-font-smoothing: antialiased;
  font-smooth: always;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 20%, rgba(26, 160, 78, .04), transparent 50%);
  pointer-events: none;
  z-index: -1;
}

.topbar {
  width: min(560px, 100%);
  display: flex;
  align-items: center;
  gap: var(--cb-gap-md);
  padding: 0 var(--cb-space-4);
  animation: slideDownFade 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.brand {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: var(--cb-space-5);
  min-width: 0;
}

.brand h1 {
  margin: 0;
  font-size: var(--cb-heading-lg);
  letter-spacing: var(--cb-letter-spacing-caps);
  font-weight: var(--cb-font-black);
  color: var(--cb-text-primary);
  text-shadow: 0 var(--cb-space-3) var(--cb-space-10) rgba(0, 0, 0, .35);
}

.brand .tag {
  color: var(--cb-text-secondary);
  font-size: var(--cb-text-xs);
  font-weight: var(--cb-font-bold);
  letter-spacing: var(--cb-letter-spacing-label);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Porte-monnaie mutualisé CB-Arcade (2 soldes : Jouer 🪙 + Gagner ◆) */
.wallet-hud {
  width: min(560px, 100%);
  display: flex;
  gap: var(--cb-space-4);
  justify-content: center;
}
.wchip {
  display: flex;
  align-items: center;
  gap: var(--cb-space-3);
  font-weight: var(--cb-font-bold);
  font-size: var(--cb-text-sm);
  color: var(--cb-text-primary);
  background: var(--cb-glass-bg);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-btn);
  padding: var(--cb-space-4) var(--cb-space-6);
  white-space: nowrap;
  box-shadow: var(--cb-shadow-xs);
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
}
.wchip .ic { font-size: 1em; line-height: 1; }
.wchip.earn {
  color: var(--cb-accent-gold, #d4af37);
  border-color: rgba(212, 175, 55, .28);
  background: rgba(212, 175, 55, .08);
}

.icon-btn {
  font: inherit;
  font-weight: var(--cb-font-bold);
  font-size: var(--cb-text-sm);
  color: var(--cb-text-primary);
  cursor: pointer;
  border: 1px solid var(--cb-border-light);
  background: var(--cb-glass-bg);
  border-radius: var(--cb-radius-btn);
  padding: var(--cb-space-5) var(--cb-space-6);
  white-space: nowrap;
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  box-shadow: var(--cb-shadow-xs);
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  position: relative;
  will-change: transform, background, box-shadow;
}

.icon-btn:hover {
  border-color: var(--cb-border-medium);
  background: rgba(255, 255, 255, .12);
  transform: translateY(-2px);
  box-shadow: var(--cb-shadow-md);
}

.icon-btn:active {
  transform: translateY(-1px);
  box-shadow: var(--cb-shadow-sm);
}

.icon-btn.pri {
  color: var(--cb-text-on-primary);
  background: linear-gradient(135deg, var(--cb-primary), #20b56c);
  border: 0;
  box-shadow: var(--cb-shadow-md);
}

.icon-btn.pri:hover {
  box-shadow: var(--cb-shadow-lg), 0 0 20px rgba(56, 224, 139, .35);
  filter: brightness(1.05);
}

.icon-btn.pri:focus-visible {
  outline: 2px solid var(--cb-accent);
  outline-offset: 2px;
}

/* ---------- Menu ---------- */
#screen-menu {
  width: min(420px, 100%);
  display: flex;
  flex-direction: column;
  gap: var(--cb-gap-lg);
  align-items: center;
  animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero {
  text-align: center;
  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero .logo {
  font-size: clamp(2.2rem, 12vw, 3.4rem);
  font-weight: var(--cb-font-black);
  letter-spacing: var(--cb-letter-spacing-caps);
  color: var(--cb-text-primary);
  text-shadow: 0 var(--cb-space-8) var(--cb-space-20) rgba(26, 160, 78, .45);
  animation: popBounce 0.6s cubic-bezier(0.2, 0.9, 0.3, 1.2);
}

.hero .sub {
  color: var(--cb-text-secondary);
  font-size: var(--cb-text-sm);
  font-weight: var(--cb-font-semibold);
  margin-top: var(--cb-space-4);
}

.mini-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--cb-space-3);
  width: 140px;
  margin: var(--cb-space-6) auto var(--cb-space-4);
  background: linear-gradient(135deg, var(--reva-felt-primary), var(--reva-felt-secondary));
  padding: var(--cb-space-3);
  border-radius: var(--cb-radius-md);
  box-shadow: var(--cb-shadow-lg), inset 0 1px 0 rgba(255, 255, 255, .12);
  animation: fadeIn 0.6s ease-out;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
}

.mini-board i {
  aspect-ratio: 1;
  border-radius: 50%;
  display: block;
  box-shadow: inset 0 -3px 6px rgba(0, 0, 0, .35);
}

.mini-board i.b {
  background: radial-gradient(circle at 35% 30%, #5a616f, #3a3f4b 55%, #0e1013);
}

.mini-board i.w {
  background: radial-gradient(circle at 35% 30%, #ffffff, #c7cedb 60%, #aab3c4);
}

.mini-board i.e {
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(26, 160, 78, .25);
}

.menu-card {
  width: 100%;
  background: var(--cb-glass-bg);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-pad-lg);
  box-shadow: var(--cb-shadow-lg), inset 0 1px 0 rgba(255, 255, 255, .08);
  animation: cardRise 0.4s cubic-bezier(0.2, 1.2, 0.4, 1) forwards;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  will-change: transform, box-shadow;
}

.menu-card:hover {
  box-shadow: var(--cb-shadow-xl), inset 0 1px 0 rgba(255, 255, 255, .12), 0 0 24px rgba(56, 224, 139, .08);
  transform: translateY(-1px);
}

.menu-card h2 {
  margin: 0 0 var(--cb-space-1);
  font-size: var(--cb-text-base);
  color: var(--reva-accent);
  font-weight: var(--cb-font-bold);
}

.menu-card .hint {
  margin: 0 0 var(--cb-space-4);
  color: var(--cb-text-secondary);
  font-size: var(--cb-text-sm);
}

.diffs {
  display: flex;
  gap: var(--cb-space-3);
  margin-bottom: var(--cb-space-4);
}

.diff-chip {
  flex: 1;
  font: inherit;
  font-weight: var(--cb-font-bold);
  font-size: var(--cb-text-sm);
  color: var(--cb-text-primary);
  cursor: pointer;
  border: 1px solid var(--cb-border-light);
  background: rgba(255, 255, 255, .05);
  border-radius: var(--cb-radius-md);
  padding: var(--cb-space-3) var(--cb-space-2);
  text-align: center;
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  will-change: transform, background, box-shadow;
}

.diff-chip:hover {
  border-color: var(--cb-border-medium);
  background: rgba(255, 255, 255, .1);
  transform: translateY(-1px);
  box-shadow: 0 0 12px rgba(56, 224, 139, .12);
}

.diff-chip.on {
  border-color: rgba(56, 224, 139, .8);
  background: rgba(56, 224, 139, .2);
  color: var(--reva-accent);
  box-shadow: 0 0 16px rgba(56, 224, 139, .35), inset 0 1px 0 rgba(255, 255, 255, .08);
}

.diff-chip:focus-visible {
  outline: 2px solid var(--cb-accent);
  outline-offset: 1px;
}

.diff-chip:active {
  transform: scale(.94);
}

.big-btn {
  width: 100%;
  font: inherit;
  font-weight: var(--cb-font-black);
  font-size: var(--cb-text-base);
  cursor: pointer;
  border: 0;
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-space-5) var(--cb-space-4);
  color: var(--cb-text-on-primary);
  background: linear-gradient(135deg, var(--cb-primary), #20b56c);
  box-shadow: var(--cb-shadow-md);
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  will-change: transform, box-shadow;
}

.big-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--cb-shadow-lg), 0 0 24px rgba(56, 224, 139, .3);
  filter: brightness(1.05);
}

.big-btn:active {
  transform: translateY(0);
  box-shadow: var(--cb-shadow-sm);
}

.big-btn:focus-visible {
  outline: 2px solid var(--cb-accent);
  outline-offset: 2px;
}

.big-btn.alt {
  color: var(--cb-text-on-primary);
  background: linear-gradient(135deg, #168e55, #0d6e3c);
  box-shadow: var(--cb-shadow-md);
}

.big-btn.alt:hover {
  box-shadow: var(--cb-shadow-lg);
  filter: brightness(1.08);
}

/* ---------- Game ---------- */
#screen-game {
  width: min(560px, 100%);
  display: none;
  flex-direction: column;
  gap: var(--cb-gap-md);
  align-items: center;
}

#screen-game.show {
  display: flex;
}

.players {
  width: 100%;
  display: flex;
  gap: var(--cb-gap-sm);
  align-items: stretch;
}

.pl {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--cb-space-3);
  background: var(--cb-glass-bg);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-md);
  padding: var(--cb-space-3);
  min-width: 0;
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  will-change: background, box-shadow, border-color;
}

.pl .disc {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  flex: 0 0 auto;
  box-shadow: inset 0 -3px 6px rgba(0, 0, 0, .35), 0 2px 4px rgba(0, 0, 0, .3);
}

.pl.black .disc {
  background: radial-gradient(circle at 35% 30%, #5a616f, #3a3f4b 55%, #0e1013);
}

.pl.white .disc {
  background: radial-gradient(circle at 35% 30%, #ffffff, #c7cedb 60%, #aab3c4);
}

.pl .nm {
  font-weight: var(--cb-font-bold);
  font-size: var(--cb-text-sm);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.pl .sc {
  font-weight: var(--cb-font-black);
  font-size: var(--cb-heading-xs);
  color: var(--cb-primary);
  font-variant-numeric: tabular-nums;
  min-width: 1.6em;
  text-align: center;
  background: rgba(0, 0, 0, .28);
  border-radius: var(--cb-radius-sm);
  padding: var(--cb-space-1) var(--cb-space-2);
}

.pl.active {
  border-color: rgba(56, 224, 139, .6);
  background: rgba(56, 224, 139, .12);
  box-shadow: 0 0 16px rgba(56, 224, 139, .35), inset 0 1px 0 rgba(255, 255, 255, .08);
}

#status {
  min-height: 1.2em;
  font-weight: var(--cb-font-black);
  font-size: var(--cb-text-base);
  color: var(--reva-accent);
  text-align: center;
  animation: fadeIn 0.3s ease-out;
}

#online-banner {
  display: none;
  width: 100%;
  background: rgba(56, 224, 139, .12);
  border: 1px solid rgba(56, 224, 139, .5);
  border-radius: var(--cb-radius-md);
  padding: var(--cb-space-4);
  gap: var(--cb-space-3);
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  animation: cardRise 0.4s ease-out;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 0 24px rgba(56, 224, 139, .15), inset 0 1px 0 rgba(255, 255, 255, .08);
}

#online-banner.show {
  display: flex;
}

#online-banner .code {
  font-weight: var(--cb-font-black);
  font-size: var(--cb-heading-sm);
  letter-spacing: var(--cb-letter-spacing-caps);
  color: var(--reva-accent);
}

#online-banner .lbl {
  color: var(--cb-text-secondary);
  font-size: var(--cb-text-xs);
  font-weight: var(--cb-font-bold);
}

.board-wrap {
  width: 100%;
  display: flex;
  justify-content: center;
  max-width: 100%;
}

#board {
  background: linear-gradient(135deg, var(--reva-felt-primary), var(--reva-felt-secondary));
  border-radius: var(--cb-radius-lg);
  padding: calc(var(--cell) * 0.32);
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
  width: min(94vw, 480px);
  --cell: calc(min(94vw, 480px) / 8);
  box-shadow: var(--cb-shadow-xl), inset 0 2px 0 rgba(255, 255, 255, .16), 0 0 40px rgba(26, 160, 78, .15);
  touch-action: manipulation;
  animation: cardRise 0.5s cubic-bezier(0.2, 1.2, 0.4, 1) forwards;
  will-change: transform;
}

[dir="rtl"] #board {
  direction: ltr;
}

.cell {
  aspect-ratio: 1;
  position: relative;
  cursor: pointer;
  background: rgba(26, 160, 78, .14);
  border-radius: 4px;
  box-shadow: inset 0 0 0 1px rgba(26, 160, 78, .35);
  transition: all var(--cb-duration-fast) var(--cb-easing-in-out);
  will-change: background, box-shadow, transform;
}

.cell:hover:not(.filled):not(.hint) {
  background: rgba(26, 160, 78, .22);
  box-shadow: inset 0 0 0 1px rgba(26, 160, 78, .45), 0 0 12px rgba(56, 224, 139, .18);
  transform: scale(1.02);
}

.cell .stone {
  position: absolute;
  inset: 9%;
  border-radius: 50%;
  transform: scale(0);
  opacity: 0;
  z-index: 2;
  transition: transform 0.16s ease-out, opacity 0.16s ease-out;
  backface-visibility: hidden;
  will-change: transform, opacity;
}

.cell.filled .stone {
  transform: scale(1);
  opacity: 1;
}

.cell.black .stone {
  background: radial-gradient(circle at 34% 28%, #616875, #3a3f4b 48%, #0e1013);
  box-shadow: inset 0 -3px 6px rgba(0, 0, 0, .65), 0 2px 4px rgba(0, 0, 0, .55), 0 0 8px rgba(56, 224, 139, .08);
}

.cell.white .stone {
  background: radial-gradient(circle at 34% 28%, #ffffff, #c7cedb 58%, #9aa4b6);
  box-shadow: inset 0 -3px 6px rgba(90, 100, 120, .55), 0 2px 4px rgba(0, 0, 0, .45), 0 0 8px rgba(56, 224, 139, .12);
}

.cell.drop .stone {
  animation: rdrop 0.32s cubic-bezier(.34, 1.4, .64, 1) both;
}

@keyframes rdrop {
  0% {
    transform: scale(0);
  }
  60% {
    transform: scale(1.14);
  }
  100% {
    transform: scale(1);
  }
}

.cell.flip .stone {
  animation: rflip 0.48s ease-in-out both;
}

@keyframes rflip {
  0% {
    transform: scale(1) rotateY(0);
  }
  50% {
    transform: scale(1.06) rotateY(90deg);
  }
  100% {
    transform: scale(1) rotateY(0);
  }
}

.cell.hint::after {
  content: "";
  position: absolute;
  inset: 30%;
  border-radius: 50%;
  background: rgba(56, 224, 139, .45);
  box-shadow: 0 0 12px rgba(56, 224, 139, .5);
  z-index: 1;
  animation: rhint 1.6s ease-in-out infinite;
}

@keyframes rhint {
  0%, 100% {
    opacity: .35;
    transform: scale(1);
  }
  50% {
    opacity: .75;
    transform: scale(1.15);
  }
}

.cell.last::before {
  content: "";
  position: absolute;
  inset: 1%;
  border-radius: 4px;
  pointer-events: none;
  z-index: 3;
  box-shadow: 0 0 0 3px rgba(56, 224, 139, .95), 0 0 14px 2px rgba(56, 224, 139, .65);
  animation: rlast 1.4s ease-in-out infinite;
}

@keyframes rlast {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: .45;
  }
}

#board.locked .cell {
  cursor: default;
}

.game-actions {
  display: flex;
  gap: var(--cb-gap-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.game-actions button {
  font: inherit;
  font-weight: var(--cb-font-bold);
  font-size: var(--cb-text-sm);
  cursor: pointer;
  border-radius: var(--cb-radius-md);
  padding: var(--cb-space-3) var(--cb-space-4);
  border: 1px solid var(--cb-border-light);
  background: var(--cb-glass-bg);
  color: var(--cb-text-primary);
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  will-change: transform, background, box-shadow;
}

.game-actions button:hover {
  border-color: var(--cb-border-medium);
  background: rgba(255, 255, 255, .12);
  transform: translateY(-1px);
  box-shadow: var(--cb-shadow-md);
}

.game-actions button:active {
  transform: translateY(-1px);
  box-shadow: var(--cb-shadow-sm);
}

.game-actions button.pri {
  color: var(--cb-text-on-primary);
  background: linear-gradient(135deg, var(--cb-primary), #20b56c);
  border: 0;
  box-shadow: var(--cb-shadow-md);
}

.game-actions button.pri:hover {
  box-shadow: var(--cb-shadow-lg), 0 0 24px rgba(56, 224, 139, .3);
  filter: brightness(1.05);
}

.game-actions button:focus-visible {
  outline: 2px solid var(--cb-accent);
  outline-offset: 2px;
}

/* ---------- Overlays ---------- */
.ov {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 60;
  padding: max(var(--cb-space-5), env(safe-area-inset-top, var(--cb-space-5))) env(safe-area-inset-left, var(--cb-space-3)) max(var(--cb-space-5), env(safe-area-inset-bottom, var(--cb-space-5))) env(safe-area-inset-right, var(--cb-space-3));
  background: var(--cb-overlay-bg);
  backdrop-filter: var(--cb-overlay-blur);
  -webkit-backdrop-filter: var(--cb-overlay-blur);
  animation: fadeIn 0.2s ease-out;
}

.ov.show {
  display: flex;
}

.dialog {
  width: min(94vw, 420px);
  max-height: 92vh;
  overflow-y: auto;
  background: var(--cb-glass-bg);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-pad-lg);
  box-shadow: var(--cb-shadow-xl), 0 0 40px rgba(0, 0, 0, .4), inset 0 1px 0 rgba(255, 255, 255, .08);
  text-align: center;
  animation: cardRise 0.4s cubic-bezier(0.2, 1.2, 0.4, 1) forwards;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
}

.dialog h2 {
  margin: 0 0 var(--cb-space-1);
  font-size: var(--cb-heading-sm);
  color: var(--reva-accent);
  font-weight: var(--cb-font-black);
}

.dialog p {
  margin: 0 0 var(--cb-space-4);
  color: var(--cb-text-secondary);
  font-size: var(--cb-text-sm);
  line-height: var(--cb-line-height-normal);
}

.dialog .field {
  display: flex;
  gap: var(--cb-space-2);
  margin: var(--cb-space-4) 0;
}

.dialog input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: var(--cb-text-base);
  text-align: center;
  letter-spacing: var(--cb-letter-spacing-caps);
  text-transform: uppercase;
  padding: var(--cb-space-3);
  border-radius: var(--cb-radius-md);
  border: 1px solid var(--cb-border-light);
  background: rgba(0, 0, 0, .32);
  color: var(--cb-text-primary);
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  will-change: border-color, box-shadow, background;
}

.dialog input:focus {
  outline: none;
  border-color: var(--reva-accent);
  box-shadow: inset 0 0 0 2px rgba(56, 224, 139, .15), 0 0 12px rgba(56, 224, 139, .3);
  background: rgba(0, 0, 0, .42);
}

.dialog input::placeholder {
  color: var(--cb-text-muted);
  letter-spacing: normal;
  text-transform: none;
  font-size: var(--cb-text-sm);
}

.dialog .btn {
  font: inherit;
  font-weight: var(--cb-font-black);
  border: 0;
  border-radius: var(--cb-radius-md);
  padding: var(--cb-space-4) var(--cb-space-5);
  cursor: pointer;
  color: var(--cb-text-on-primary);
  background: linear-gradient(135deg, var(--cb-primary), #20b56c);
  white-space: nowrap;
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  box-shadow: var(--cb-shadow-sm);
  will-change: transform, box-shadow;
}

.dialog .btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--cb-shadow-md), 0 0 20px rgba(56, 224, 139, .25);
  filter: brightness(1.05);
}

.dialog .btn:active {
  transform: translateY(0);
  box-shadow: var(--cb-shadow-sm);
}

.dialog .btn:focus-visible {
  outline: 2px solid var(--cb-accent);
  outline-offset: 2px;
}

.dialog .btn.alt {
  color: var(--cb-text-on-primary);
  background: linear-gradient(135deg, #168e55, #0d6e3c);
  box-shadow: var(--cb-shadow-sm);
}

.dialog .btn.alt:hover {
  box-shadow: var(--cb-shadow-md), 0 0 20px rgba(56, 224, 139, .25);
}

.dialog .btn.ghost {
  color: var(--cb-text-primary);
  background: rgba(255, 255, 255, .08);
}

.dialog .btn.ghost:hover {
  background: rgba(255, 255, 255, .14);
  box-shadow: 0 0 16px rgba(56, 224, 139, .15);
}

.dialog .btn.wide {
  display: block;
  width: 100%;
  margin-top: var(--cb-space-3);
}

.dialog .sep {
  color: var(--cb-text-muted);
  font-size: var(--cb-text-xs);
  font-weight: var(--cb-font-bold);
  letter-spacing: var(--cb-letter-spacing-caps);
  text-transform: uppercase;
  margin: var(--cb-space-6) 0 var(--cb-space-3);
}

.over-emoji {
  font-size: 3rem;
  line-height: 1;
  margin-bottom: var(--cb-space-4);
  animation: popBounce 0.7s cubic-bezier(0.2, 0.9, 0.3, 1.3);
  filter: drop-shadow(0 0 16px rgba(56, 224, 139, .4));
}

.over-score {
  display: flex;
  gap: var(--cb-space-6);
  justify-content: center;
  align-items: center;
  margin: var(--cb-space-4) 0 var(--cb-space-5);
  padding: var(--cb-space-4) 0;
  border-radius: var(--cb-radius-md);
  background: rgba(56, 224, 139, .06);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08);
}

.over-score .os {
  display: flex;
  align-items: center;
  gap: var(--cb-space-2);
  font-weight: var(--cb-font-black);
  font-size: var(--cb-heading-sm);
  text-shadow: 0 0 12px rgba(56, 224, 139, .35);
}

.over-score .d {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  box-shadow: inset 0 -2px 4px rgba(0, 0, 0, .35);
}

.over-score .d.b {
  background: radial-gradient(circle at 35% 30%, #5a616f, #3a3f4b 55%, #0e1013);
}

.over-score .d.w {
  background: radial-gradient(circle at 35% 30%, #fff, #c7cedb 60%, #aab3c4);
}

#toast {
  position: fixed;
  left: 50%;
  bottom: max(var(--cb-space-6), env(safe-area-inset-bottom, var(--cb-space-6)));
  transform: translateX(-50%);
  background: var(--cb-glass-bg);
  border: 1px solid var(--cb-border-light);
  color: var(--cb-text-primary);
  padding: var(--cb-space-3) var(--cb-space-4);
  border-radius: var(--cb-radius-pill);
  font-weight: var(--cb-font-bold);
  font-size: var(--cb-text-sm);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--cb-duration-normal) var(--cb-easing-in-out), transform var(--cb-duration-normal) var(--cb-easing-in-out);
  box-shadow: var(--cb-shadow-lg), inset 0 1px 0 rgba(255, 255, 255, .08);
  max-width: 86vw;
  text-align: center;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  will-change: opacity, transform;
}

#toast.show {
  opacity: 1;
  animation: slideInUp 0.3s var(--cb-easing-bounce);
}

@keyframes slideDownFade {
  0% {
    opacity: 0;
    transform: translateY(-8px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(12px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cardRise {
  0% {
    opacity: 0;
    transform: translateY(10px) scale(0.97);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes popBounce {
  0% {
    transform: scale(0.5);
    opacity: 0;
  }
  50% {
    transform: scale(1.12);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes slideInUp {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(16px);
  }
  100% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .cell.drop .stone,
  .cell.flip .stone {
    animation: none;
  }
  .cell.last::before,
  .cell.hint::after {
    animation: none;
  }
  .big-btn:hover,
  .icon-btn:hover,
  .diff-chip:hover {
    filter: none;
  }
  body::before {
    display: none;
  }
}

@media (prefers-contrast: more) {
  :root {
    --cb-border-light: rgba(255, 255, 255, 0.20);
    --cb-border-medium: rgba(255, 255, 255, 0.32);
  }
  .cell {
    box-shadow: inset 0 0 0 2px rgba(26, 160, 78, .65);
  }
  .pl, .menu-card, .icon-btn {
    border-color: rgba(255, 255, 255, 0.24) !important;
  }
}