/* ============================================================================
   PAIRZ — PASSE ESTHÉTIQUE PREMIUM AVANCÉE
   ============================================================================
   Harmonie complète CB-ARCADE : glassmorphism, glow effects, animations 3D,
   will-change GPU optimisé, micro-interactions premium, light/dark mode,
   RTL arabe, safe-areas iPhone. Identité émeraude + accents or CB.
   ========================================================================== */

:root {
  /* --- PALETTE PREMIUM (alignée kit-design.css) --- */
  --cb-primary:      #38e08b;       /* vert lumineux primaire */
  --cb-primary-dark: #20b56c;       /* vert sombre (hover) */
  --cb-primary-light: #52f5a5;      /* vert clair (futur light mode) */
  --cb-accent:       #d4af37;       /* or premium riche (highlights) */
  --cb-accent-light: #f4dfa6;       /* or très clair */
  --cb-accent-dark:  #b89630;       /* or sombre (hover) */

  /* Surfaces & glassmorphism */
  --cb-surface-0:    #141a23;       /* surface clair */
  --cb-surface-1:    #0e1219;       /* surface primaire (base) */
  --cb-surface-2:    #1a2029;       /* surface secondaire */
  --cb-glass-bg:     rgba(20, 26, 35, 0.85);    /* verre dépoli */
  --cb-glass-blur:   blur(10px) saturate(1.15);  /* glassmorphism premium */

  /* Texte (WCAG AAA contraste) */
  --cb-text-primary: #f0f4fa;       /* principal */
  --cb-text-secondary: #9aa8bd;     /* secondaire */
  --cb-text-muted:   #7c8aa0;       /* discret */
  --cb-text-on-primary: #062015;    /* sur vert */

  /* Borders premium */
  --cb-border-light:  rgba(255, 255, 255, 0.08);
  --cb-border-medium: rgba(255, 255, 255, 0.12);
  --cb-border-strong: rgba(255, 255, 255, 0.16);
  --cb-border-focus:  rgba(212, 175, 55, 0.42);

  /* Espacements (8px grid) */
  --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-12:  24px;
  --cb-space-16:  32px;

  /* Rayons premium (smooth, jamais tranchant) */
  --cb-radius-xs: 4px;
  --cb-radius-sm: 8px;
  --cb-radius-md: 12px;
  --cb-radius-lg: 16px;
  --cb-radius-xl: 20px;
  --cb-radius-full: 999px;

  /* Ombres bokeh-like (amples, douces) */
  --cb-shadow-xs:    0 2px 4px rgba(0, 0, 0, 0.12);
  --cb-shadow-sm:    0 4px 12px rgba(0, 0, 0, 0.15);
  --cb-shadow-md:    0 8px 20px rgba(0, 0, 0, 0.18);
  --cb-shadow-lg:    0 12px 34px rgba(0, 0, 0, 0.25);
  --cb-shadow-xl:    0 20px 50px rgba(0, 0, 0, 0.35);
  --cb-shadow-2xl:   0 28px 70px rgba(0, 0, 0, 0.55);
  --cb-shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.08);

  /* Animations (respecte prefers-reduced-motion) */
  --cb-duration-fast:    0.12s;
  --cb-duration-normal:  0.18s;
  --cb-duration-slow:    0.3s;
  --cb-duration-deliberate: 0.4s;

  /* Easings (cubic-bezier premium) */
  --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);

  /* Focus visibles (gold ring subtle) */
  --cb-focus-ring:   2px solid rgba(212, 175, 55, 0.9);
  --cb-focus-offset: 2px;
  --cb-focus-shadow: 0 0 0 5px rgba(212, 175, 55, 0.18);

  /* States (hover, active, disabled) */
  --cb-active-scale: 0.94;

  /* Legacy compatibilité pairz (map vers CB) */
  --accent: var(--cb-accent);
  --accent-secondary: var(--cb-primary);
  --bad: #ff6b63;
  --good: var(--cb-primary);
  --shadow-inset: var(--cb-shadow-inset);
  --shadow-drop: var(--cb-shadow-md);
  --shadow-lg: var(--cb-shadow-lg);
  --line: var(--cb-border-medium);

  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-0: #f5faf8;
    --bg-1: #fbfdfc;
    --bg-2: #ffffff;
    --bg-glow: rgba(22, 129, 92, 0.15);
    --panel-0: #ffffff;
    --panel-1: #f5faf8;
    --felt: #f0f8f5;
    --line: rgba(0, 0, 0, 0.08);
    --ink: #0d3a2e;
    --ink-dark: #030201;
    --muted: #6b8a7f;
    --muted-dark: #8ba39b;
    --card-light: #f5faf8;
    --card-dark: #e8f3ec;
    --card-border: #a8cfc0;
    --accent-ink: #fff9e6;
    color-scheme: light;
  }
}

/* --- Reset & Base --- */
* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

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

body {
  background: linear-gradient(135deg, #0a1f18 0%, var(--cb-surface-1) 50%, #051410 100%);
  background-attachment: fixed;
  color: var(--cb-text-primary);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.35;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: max(var(--cb-space-6), env(safe-area-inset-top, 0px)) var(--cb-space-6) max(var(--cb-space-8), env(safe-area-inset-bottom, 0px));
  gap: var(--cb-space-8);
  -webkit-user-select: none;
  user-select: none;
  overflow-x: hidden;
}

/* --- Topbar --- */
.topbar {
  width: min(560px, 100%);
  display: flex;
  align-items: center;
  gap: var(--cb-space-4);
  padding: var(--cb-space-4);
}

.brand {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: var(--cb-space-3);
  min-width: 0;
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.2rem, 5vw, 1.4rem);
  letter-spacing: 0.04em;
  font-weight: 800;
  color: var(--cb-text-primary);
  animation: logoGlow 3.2s ease-in-out infinite;
  text-shadow: 0 0 24px rgba(56, 224, 139, 0.28), 0 0 48px rgba(56, 224, 139, 0.14);
}

@keyframes logoGlow {
  0%, 100% {
    opacity: 1;
    filter: drop-shadow(0 0 12px rgba(56, 224, 139, 0.2)) drop-shadow(0 0 24px rgba(56, 224, 139, 0.1));
  }
  50% {
    opacity: 0.95;
    filter: drop-shadow(0 0 16px rgba(56, 224, 139, 0.32)) drop-shadow(0 0 32px rgba(56, 224, 139, 0.18));
  }
}

.brand .tag {
  color: var(--cb-text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.icon-btn {
  font: inherit;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--cb-text-primary);
  cursor: pointer;
  text-decoration: none;
  border: 1px solid var(--cb-border-light);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--cb-radius-sm);
  padding: var(--cb-space-5) var(--cb-space-6);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: var(--cb-space-3);
  transition: all var(--cb-duration-fast) var(--cb-easing-in-out);
  outline-offset: var(--cb-focus-offset);
  flex-shrink: 0;
  will-change: background, box-shadow, transform, border-color;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--cb-border-strong);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2), 0 0 12px rgba(212, 175, 55, 0.12);
}

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

.icon-btn:focus-visible {
  outline: var(--cb-focus-ring);
  box-shadow: var(--cb-focus-shadow);
}

/* --- MENU --- */
#screen-menu {
  width: min(420px, 100%);
  display: flex;
  flex-direction: column;
  gap: var(--cb-space-10);
  align-items: center;
  margin-top: max(2vh, var(--cb-space-10));
  padding: 0 var(--cb-space-6);
  animation: heroFadeIn var(--cb-duration-normal) var(--cb-easing-ease-out);
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.hero {
  text-align: center;
}

.hero .logo {
  font-size: clamp(2.2rem, 11vw, 3.2rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--cb-text-primary);
  animation: logoGlowHero 3.2s ease-in-out infinite;
  text-shadow: 0 0 24px rgba(56, 224, 139, 0.28), 0 0 48px rgba(56, 224, 139, 0.14), 0 0 2px rgba(56, 224, 139, 0.4);
}

@keyframes logoGlowHero {
  0%, 100% {
    opacity: 1;
    filter: drop-shadow(0 0 12px rgba(56, 224, 139, 0.2)) drop-shadow(0 0 24px rgba(56, 224, 139, 0.1));
  }
  50% {
    opacity: 0.95;
    filter: drop-shadow(0 0 16px rgba(56, 224, 139, 0.32)) drop-shadow(0 0 32px rgba(56, 224, 139, 0.18));
  }
}

.hero .glyphs {
  font-size: 1.6rem;
  letter-spacing: 0.2em;
  margin-top: var(--cb-space-4);
  animation: glyphsFloat 3s ease-in-out infinite;
}

@keyframes glyphsFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.hero .sub {
  color: var(--cb-text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: var(--cb-space-6);
  letter-spacing: 0.02em;
}

.menu-card {
  width: 100%;
  background: linear-gradient(135deg, rgba(20, 26, 35, 0.6), rgba(26, 32, 41, 0.5));
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-space-10);
  box-shadow: var(--cb-shadow-lg), 0 0 16px rgba(212, 175, 55, 0.08);
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  animation: cardSlideIn var(--cb-duration-normal) var(--cb-easing-ease-out) both;
  will-change: transform, box-shadow, border-color, background;
}

@keyframes cardSlideIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.menu-card:nth-child(2) {
  animation-delay: var(--cb-duration-fast);
}

.menu-card:nth-child(3) {
  animation-delay: calc(var(--cb-duration-fast) * 2);
}

.menu-card:hover {
  border-color: var(--cb-border-strong);
  background: linear-gradient(135deg, rgba(20, 26, 35, 0.75), rgba(26, 32, 41, 0.65));
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3), 0 0 24px rgba(212, 175, 55, 0.14);
  transform: translateY(-4px);
}

.menu-card h2 {
  margin: 0 0 4px;
  font-size: 1.02rem;
  color: #e7fbf2;
}

.menu-card .hint {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.4;
}

.size-row {
  display: flex;
  gap: var(--cb-gap-md);
  margin-bottom: var(--cb-space-6);
}

.size-btn {
  flex: 1;
  font: inherit;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--cb-text-primary);
  cursor: pointer;
  border: 2px solid var(--cb-border-light);
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--cb-radius-md);
  padding: var(--cb-space-5) var(--cb-space-4);
  text-align: center;
  line-height: 1.25;
  transition: all var(--cb-duration-fast) var(--cb-easing-in-out);
  outline-offset: var(--cb-focus-offset);
  will-change: background, border-color, transform, box-shadow;
}

.size-btn .nm {
  font-size: 0.9rem;
  display: block;
}

.size-btn .dim {
  font-size: 0.72rem;
  color: var(--cb-text-secondary);
  font-weight: 700;
}

.size-btn:hover {
  border-color: var(--cb-border-strong);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.size-btn.on {
  border-color: var(--cb-primary);
  background: rgba(56, 224, 139, 0.18);
  color: var(--cb-text-primary);
  box-shadow: 0 0 0 4px rgba(56, 224, 139, 0.25), 0 6px 16px rgba(56, 224, 139, 0.2);
  transform: scale(1.03);
}

.size-btn.on .dim {
  color: rgba(56, 224, 139, 0.7);
}

.size-btn:active {
  transform: scale(0.96);
}

.size-btn:focus-visible {
  outline: var(--cb-focus-ring);
  box-shadow: var(--cb-focus-shadow);
}

.big-btn {
  width: 100%;
  font: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: 0;
  border-radius: var(--cb-radius-md);
  padding: 14px;
  color: var(--cb-text-on-primary);
  background: linear-gradient(180deg, var(--cb-primary), var(--cb-primary-dark));
  box-shadow: var(--cb-shadow-md), 0 0 12px rgba(56, 224, 139, 0.15);
  transition: all var(--cb-duration-fast);
  outline-offset: var(--cb-focus-offset);
  position: relative;
  overflow: hidden;
  will-change: transform, box-shadow;
}

.big-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.12);
  opacity: 0;
  transition: opacity var(--cb-duration-fast);
}

.big-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(56, 224, 139, 0.45), 0 0 20px rgba(212, 175, 55, 0.15);
}

.big-btn:hover::before {
  opacity: 1;
}

.big-btn:active {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(56, 224, 139, 0.3);
}

.big-btn:focus-visible {
  outline: var(--cb-focus-ring);
  box-shadow: var(--cb-focus-shadow);
}

.big-btn.alt {
  color: var(--cb-text-primary);
  background: linear-gradient(180deg, #5280e0, #3854bd);
  box-shadow: 0 8px 24px rgba(75, 140, 240, 0.3);
  will-change: transform, box-shadow;
}

.big-btn.alt:hover {
  box-shadow: 0 16px 40px rgba(75, 140, 240, 0.45);
  transform: translateY(-3px);
}

.big-btn.alt:active {
  transform: translateY(-1px);
}

#challenge-banner {
  width: 100%;
  background: linear-gradient(135deg, rgba(56, 224, 139, 0.15), rgba(56, 224, 139, 0.08));
  backdrop-filter: var(--cb-glass-blur);
  border: 1px solid rgba(56, 224, 139, 0.5);
  border-radius: var(--cb-radius-md);
  padding: var(--cb-space-8);
  gap: var(--cb-gap-md);
  text-align: center;
  animation: bannerPop var(--cb-duration-normal) var(--cb-easing-bounce) both;
  box-shadow: 0 8px 20px rgba(56, 224, 139, 0.2);
}

@keyframes bannerPop {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

#challenge-banner .lbl {
  color: rgba(56, 224, 139, 0.8);
  font-size: 0.86rem;
  font-weight: 800;
  margin-bottom: var(--cb-space-3);
}

#challenge-banner .seed {
  color: var(--cb-text-secondary);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: var(--cb-space-10);
}

/* --- GAME --- */
#screen-game {
  width: min(560px, 100%);
  display: none;
  flex-direction: column;
  gap: var(--cb-space-8);
  align-items: center;
}

#screen-game.show {
  display: flex;
  animation: screenIn var(--cb-duration-normal) var(--cb-easing-ease-out);
}

@keyframes screenIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.hud {
  display: flex;
  align-items: center;
  gap: var(--cb-space-2);
  width: 100%;
}

.hud .box {
  flex: 1;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-space-4) var(--cb-space-5);
  text-align: center;
  min-width: 0;
  box-shadow: var(--cb-shadow-inset), 0 0 8px rgba(212, 175, 55, 0.06);
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  will-change: box-shadow, border-color;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
}

.hud .box:hover {
  border-color: var(--cb-border-strong);
  box-shadow: 0 4px 12px rgba(56, 224, 139, 0.1), 0 0 12px rgba(212, 175, 55, 0.08);
}

.hud .box .k {
  color: var(--cb-text-secondary);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hud .box .v {
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
  line-height: 1.15;
}

.hud .box .v.small {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--cb-text-secondary);
}

.board {
  display: grid;
  grid-template-columns: repeat(var(--cols, 4), 1fr);
  gap: clamp(5px, 1.6vw, 10px);
  width: 100%;
  max-width: min(560px, 94vw);
  margin: 0 auto;
  perspective: 900px;
  padding: var(--cb-space-4);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0));
  border-radius: var(--cb-radius-lg);
  border: 1px solid var(--cb-border-light);
  box-shadow: var(--cb-shadow-inset), 0 0 12px rgba(212, 175, 55, 0.05);
  animation: boardFadeIn var(--cb-duration-normal) var(--cb-easing-ease-out);
  will-change: opacity;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
}

@keyframes boardFadeIn {
  from {
    opacity: 0;
    transform: scale(0.98);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.board.size-hard {
  max-width: min(560px, 96vw);
}

.card {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 0;
  background: none;
  padding: 0;
  cursor: pointer;
  border-radius: clamp(9px, 2.4vw, 15px);
  outline: none;
  transition: transform var(--cb-duration-normal) var(--cb-easing-out);
  will-change: transform;
}

.card:hover {
  transform: scale(1.05);
}

.card:focus-visible {
  outline: var(--cb-focus-ring);
  box-shadow: var(--cb-focus-shadow);
}

.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.34s cubic-bezier(0.4, 1.3, 0.5, 1);
  will-change: transform;
}

.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: inherit;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  font-size: calc(min(560px, 90vw) / var(--cols, 4) * 0.52);
  line-height: 1;
  border: 1px solid var(--cb-border-light);
  font-weight: 900;
  transition: all var(--cb-duration-fast) var(--cb-easing-in-out);
  will-change: border-color, box-shadow, filter;
}

.face.back {
  background: linear-gradient(150deg, #1c4a3d, #123329);
  color: rgba(255, 255, 255, 0.28);
  box-shadow: var(--cb-shadow-inset), 0 0 8px rgba(212, 175, 55, 0.06);
}

.face.back::after {
  content: '';
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.14), transparent 60%);
}

.face.front {
  background: linear-gradient(160deg, #123a30, #0e2b23);
  transform: rotateY(180deg);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3) inset, 0 0 8px rgba(212, 175, 55, 0.08);
}

.card.matched .card-inner {
  animation: cardPop 0.42s var(--cb-easing-bounce);
  will-change: transform;
}

.card.matched .face.front {
  border-color: var(--cb-primary);
  box-shadow: 0 0 0 2px rgba(56, 224, 139, 0.5), 0 0 18px rgba(56, 224, 139, 0.35) inset, 0 0 0 6px rgba(56, 224, 139, 0.15), 0 0 12px rgba(212, 175, 55, 0.1);
}

.card.wrong .face.front {
  border-color: var(--bad);
  box-shadow: 0 0 0 2px rgba(255, 107, 107, 0.6), 0 0 12px rgba(255, 107, 107, 0.3);
  animation: cardShake 0.3s ease;
  will-change: transform;
}

@keyframes cardPop {
  0% {
    transform: rotateY(180deg) scale(1);
    filter: brightness(1);
  }
  45% {
    transform: rotateY(180deg) scale(1.12);
    filter: brightness(1.08);
  }
  100% {
    transform: rotateY(180deg) scale(1);
    filter: brightness(1);
  }
}

@keyframes cardShake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-4px);
  }
  75% {
    transform: translateX(4px);
  }
}

.spark {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(56, 224, 139, 0.8), transparent 62%);
  animation: sparkFx 0.6s ease-out forwards;
  will-change: transform, opacity;
}

@keyframes sparkFx {
  0% {
    opacity: 0.95;
    transform: scale(0.5);
    filter: brightness(1.2);
  }
  60% {
    opacity: 0.4;
  }
  100% {
    opacity: 0;
    transform: scale(1.8);
    filter: brightness(0.8);
  }
}

.game-actions {
  display: flex;
  justify-content: center;
  gap: var(--cb-space-4);
  padding: var(--cb-space-4);
}

.game-actions button {
  font: inherit;
  font-weight: 800;
  font-size: 0.84rem;
  cursor: pointer;
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-space-5) var(--cb-space-8);
  border: 1px solid var(--cb-border-light);
  background: rgba(255, 255, 255, 0.06);
  color: var(--cb-text-primary);
  transition: all var(--cb-duration-normal) var(--cb-easing-out);
  box-shadow: var(--cb-shadow-md), 0 0 8px rgba(212, 175, 55, 0.05);
  outline-offset: var(--cb-focus-offset);
  will-change: background, box-shadow, transform;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
}

.game-actions button:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2), 0 0 12px rgba(212, 175, 55, 0.1);
  border-color: var(--cb-border-strong);
}

.game-actions button:active {
  transform: translateY(0);
  box-shadow: var(--cb-shadow-sm);
}

.game-actions button:focus-visible {
  outline: var(--cb-focus-ring);
  box-shadow: var(--cb-focus-shadow);
}

/* --- OVERLAYS --- */
.ov {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 60;
  padding: var(--cb-space-8);
  background: rgba(6, 9, 14, 0.72);
  backdrop-filter: var(--cb-glass-blur);
}

.ov.show {
  display: flex;
  animation: fadeIn var(--cb-duration-normal) var(--cb-easing-out);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.dialog {
  width: min(94vw, 420px);
  max-height: 90vh;
  overflow: auto;
  background: linear-gradient(135deg, rgba(20, 26, 35, 0.85), rgba(26, 32, 41, 0.75));
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-xl);
  padding: var(--cb-space-12);
  box-shadow: var(--cb-shadow-2xl), 0 0 20px rgba(212, 175, 55, 0.1);
  text-align: center;
  animation: slideUp var(--cb-duration-normal) var(--cb-easing-bounce);
  will-change: transform, box-shadow;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.dialog h2 {
  margin: 0 0 var(--cb-space-3);
  font-size: 1.4rem;
  color: var(--cb-text-primary);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.dialog p {
  margin: 0 0 var(--cb-space-8);
  color: var(--cb-text-secondary);
  font-size: 0.9rem;
  line-height: 1.55;
}

.btn {
  font: inherit;
  font-weight: 700;
  border: 0;
  border-radius: var(--cb-radius-md);
  padding: 14px 16px;
  cursor: pointer;
  color: var(--cb-text-on-primary);
  background: linear-gradient(180deg, var(--cb-primary), var(--cb-primary-dark));
  box-shadow: var(--cb-shadow-md), 0 0 12px rgba(56, 224, 139, 0.15);
  transition: all var(--cb-duration-normal) var(--cb-easing-out);
  outline-offset: var(--cb-focus-offset);
  will-change: transform, box-shadow;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(56, 224, 139, 0.35), 0 0 16px rgba(212, 175, 55, 0.12);
}

.btn:active {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(56, 224, 139, 0.25);
}

.btn:focus-visible {
  outline: var(--cb-focus-ring);
  box-shadow: var(--cb-focus-shadow);
}

.btn.alt {
  color: var(--cb-text-primary);
  background: linear-gradient(180deg, #5280e0, #3854bd);
  box-shadow: 0 8px 24px rgba(75, 140, 240, 0.3);
}

.btn.alt:hover {
  box-shadow: 0 12px 32px rgba(75, 140, 240, 0.4);
  transform: translateY(-2px);
}

.btn.alt:active {
  transform: translateY(-1px);
}

.btn.ghost {
  color: var(--cb-text-primary);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: none;
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

.btn.wide {
  display: block;
  width: 100%;
  margin-top: var(--cb-space-10);
}

.over-emoji {
  font-size: 2.6rem;
  line-height: 1;
  margin-bottom: var(--cb-space-2);
  animation: emojiPop var(--cb-duration-slow) var(--cb-easing-bounce);
}

@keyframes emojiPop {
  0% {
    transform: scale(0) rotate(-25deg);
    opacity: 0;
    filter: brightness(0.6);
  }
  45% {
    filter: brightness(1.15);
  }
  60% {
    transform: scale(1.15) rotate(5deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
    filter: brightness(1);
  }
}

#over-newbest {
  color: var(--cb-primary);
  font-weight: 700;
  margin: var(--cb-space-2) 0 var(--cb-space-8);
  animation: pulse 2s ease-in-out infinite;
  letter-spacing: 0.02em;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.stats {
  display: flex;
  gap: var(--cb-space-10);
  margin: var(--cb-space-3) 0 var(--cb-space-8);
}

.stats .s {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-space-6);
  box-shadow: var(--cb-shadow-inset);
  transition: all var(--cb-duration-normal) var(--cb-easing-in-out);
  will-change: transform, box-shadow;
}

.stats .s:hover {
  border-color: var(--cb-border-strong);
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(56, 224, 139, 0.15);
}

.stats .s .k {
  color: var(--cb-text-secondary);
  font-size: 0.66rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stats .s .v {
  font-size: 1.35rem;
  font-weight: 900;
  color: #fff;
}

.stats .s.big .v {
  color: var(--cb-primary);
}

#over-seed {
  color: var(--cb-text-secondary);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: var(--cb-space-2) 0 var(--cb-space-10);
}

.bd-tabs {
  display: flex;
  gap: var(--cb-space-2);
  margin: var(--cb-space-3) 0 var(--cb-space-8);
}

.bd-tab {
  flex: 1;
  font: inherit;
  font-weight: 700;
  font-size: 0.82rem;
  color: rgba(56, 224, 139, 0.6);
  cursor: pointer;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--cb-radius-lg);
  padding: var(--cb-space-5);
  transition: all var(--cb-duration-normal) var(--cb-easing-out);
  outline-offset: var(--cb-focus-offset);
  will-change: background, border-color, box-shadow, transform;
}

.bd-tab:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--cb-border-strong);
  transform: translateY(-1px);
}

.bd-tab.on {
  color: var(--cb-text-on-primary);
  background: linear-gradient(180deg, var(--cb-primary), var(--cb-primary-dark));
  border: 0;
  box-shadow: 0 0 0 2px rgba(56, 224, 139, 0.3), 0 4px 12px rgba(56, 224, 139, 0.25);
}

.bd-tab:focus-visible {
  outline: var(--cb-focus-ring);
  box-shadow: var(--cb-focus-shadow);
}

ol#board-list {
  list-style: none;
  margin: 0 0 var(--cb-space-4);
  padding: 0;
  max-height: 34vh;
  overflow: auto;
  text-align: start;
}

ol#board-list li {
  display: flex;
  align-items: center;
  gap: var(--cb-space-10);
  padding: var(--cb-space-5) var(--cb-space-6);
  border-radius: var(--cb-radius-md);
  font-size: 0.92rem;
  transition: all var(--cb-duration-fast) var(--cb-easing-out);
  will-change: background, transform;
}

ol#board-list li:nth-child(odd) {
  background: rgba(255, 255, 255, 0.05);
}

ol#board-list li:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateX(2px);
}

ol#board-list li.me {
  background: rgba(56, 224, 139, 0.16);
  border: 1px solid rgba(56, 224, 139, 0.55);
}

ol#board-list .rk {
  width: 22px;
  font-weight: 900;
  color: var(--cb-primary);
  text-align: center;
  flex: none;
}

ol#board-list .nm {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--cb-text-primary);
}

ol#board-list .sc {
  font-weight: 900;
  color: var(--cb-accent);
}

ol#board-list .bd-empty,
ol#board-list .bd-note {
  justify-content: center;
  color: var(--cb-text-secondary);
  font-size: 0.82rem;
  background: none !important;
}

/* --- Décompte 3-2-1 --- */
#ov-go {
  background: rgba(6, 9, 14, 0.72);
}

#go-text {
  font-size: clamp(2.6rem, 16vw, 4.2rem);
  font-weight: 900;
  color: #fff;
  text-shadow: 0 6px 30px rgba(56, 224, 139, 0.6), 0 0 20px rgba(56, 224, 139, 0.4);
  animation: bump var(--cb-duration-slow) cubic-bezier(0.34, 1.5, 0.6, 1);
}

#go-text.bump {
  animation: bump var(--cb-duration-slow) cubic-bezier(0.34, 1.5, 0.6, 1);
}

@keyframes bump {
  0% {
    transform: scale(0.5) rotate(-12deg);
    opacity: 0;
    filter: brightness(0.8);
  }
  50% {
    filter: brightness(1.2);
  }
  60% {
    transform: scale(1.15) rotate(2deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
    filter: brightness(1);
  }
}

/* --- Toast notifications --- */
#toast {
  position: fixed;
  left: 50%;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  background: var(--cb-surface-0);
  border: 1px solid var(--cb-border-light);
  color: var(--cb-text-primary);
  padding: 11px 16px;
  border-radius: var(--cb-radius-lg);
  font-weight: 700;
  font-size: 0.86rem;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--cb-duration-normal);
  box-shadow: var(--cb-shadow-lg), 0 0 12px rgba(212, 175, 55, 0.08);
  max-width: 86vw;
  text-align: center;
  backdrop-filter: var(--cb-glass-blur);
  -webkit-backdrop-filter: var(--cb-glass-blur);
  animation: toastSlideIn var(--cb-duration-normal) var(--cb-easing-ease-out);
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

#toast.show {
  opacity: 1;
  pointer-events: auto;
}

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

  .card-inner {
    transition: none !important;
  }

  .big-btn:hover {
    transform: none;
  }

  .icon-btn:hover {
    transform: none;
  }
}

/* --- High Contrast Mode --- */
@media (prefers-contrast: more) {
  :root {
    --cb-border-light: rgba(255, 255, 255, 0.16);
    --cb-border-medium: rgba(255, 255, 255, 0.24);
    --cb-border-strong: rgba(255, 255, 255, 0.32);
    --cb-focus-ring: 2px solid rgba(212, 175, 55, 1);
    --cb-focus-offset: 3px;
  }
}

/* --- Responsive Mobile --- */
@media (max-width: 480px) {
  body {
    padding: calc(6px + env(safe-area-inset-top, 0px)) var(--cb-space-4) calc(12px + env(safe-area-inset-bottom, 0px));
    gap: var(--cb-space-8);
    font-size: 0.875rem;
  }

  .topbar {
    font-size: 0.85rem;
  }

  .brand h1 {
    font-size: 1rem;
  }

  .hero .logo {
    font-size: clamp(1.8rem, 10vw, 2.6rem);
  }

  .dialog {
    padding: var(--cb-space-8);
    border-radius: var(--cb-radius-lg);
  }

  .menu-card {
    padding: var(--cb-space-8);
  }

  .size-row {
    flex-direction: column;
  }

  .size-btn {
    padding: var(--cb-space-6) var(--cb-space-4);
  }
}

/* --- MODE CLAIR (Light Mode Support) --- */
@media (prefers-color-scheme: light) {
  :root {
    --cb-surface-0: #f5faf8;
    --cb-surface-1: #ffffff;
    --cb-surface-2: #f0f3f7;
    --cb-text-primary: #0d3a2e;
    --cb-text-secondary: #5a7a6f;
    --cb-text-muted: #7a8f84;
    --cb-text-on-primary: #ffffff;
    --cb-border-light: rgba(0, 0, 0, 0.08);
    --cb-border-medium: rgba(0, 0, 0, 0.12);
    --cb-border-strong: rgba(0, 0, 0, 0.16);
    --cb-primary: #1b8a5e;
    --cb-primary-dark: #0f5c3e;
    --cb-accent: #b8860b;
  }

  body {
    background: linear-gradient(135deg, #f5faf8 0%, #fbfdfc 50%, #ffffff 100%);
    color: var(--cb-text-primary);
  }

  .brand h1,
  .hero .logo {
    animation: none;
    text-shadow: 0 2px 8px rgba(27, 138, 94, 0.15);
    filter: none;
  }

  .menu-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(245, 250, 248, 0.9));
    border-color: rgba(27, 138, 94, 0.15);
  }

  .dialog {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(245, 250, 248, 0.95));
    border-color: rgba(27, 138, 94, 0.15);
  }

  .face.back {
    background: linear-gradient(150deg, #d0e8dd, #c5dfd6);
    color: rgba(13, 58, 46, 0.5);
  }

  .face.front {
    background: linear-gradient(160deg, #c5dfd6, #b8d5cc);
  }

  .bd-tab.on {
    color: #ffffff;
  }
}

/* --- RTL SUPPORT (Arabic/RTL languages) --- */
[dir='rtl'] .brand {
  flex-direction: row-reverse;
}

[dir='rtl'] .icon-btn {
  flex-direction: row-reverse;
}

[dir='rtl'] .topbar {
  direction: rtl;
}

[dir='rtl'] .size-row {
  flex-direction: row-reverse;
}

[dir='rtl'] ol#board-list .nm {
  text-align: right;
}

[dir='rtl'] .stats {
  flex-direction: row-reverse;
}

[dir='rtl'] .menu-card {
  direction: rtl;
  text-align: right;
}

[dir='rtl'] .dialog {
  direction: rtl;
  text-align: center;
}

[dir='rtl'] ol#board-list li {
  flex-direction: row-reverse;
}