/* KALIFY Pong - design system officiel */
:root {
  --kalify-navy: #0A0D31;
  --kalify-navy-2: #131746;
  --kalify-primary: #00DF9C;
  --kalify-secondary: #010ED0;
  --kalify-text: #E2E8F0;
  --kalify-text-muted: #94A3B8;
  --kalify-error: #EF4444;
  --kalify-radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(ellipse at top, var(--kalify-navy-2) 0%, var(--kalify-navy) 70%);
  color: var(--kalify-text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hero {
  text-align: center;
  padding: 32px 24px 8px;
  position: relative;
}

.auth-bar {
  position: absolute;
  top: 16px;
  right: 24px;
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 0.85rem;
}
.auth-greeting { color: var(--kalify-text-muted); }
.auth-greeting strong { color: var(--kalify-primary); font-weight: 600; }
.btn--sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn--sm svg { flex-shrink: 0; }

@media (max-width: 600px) {
  .auth-bar { position: static; justify-content: center; margin-bottom: 12px; }
}
.hero .brand {
  display: inline-block;
  font-weight: 800;
  letter-spacing: 0.4em;
  font-size: 0.75rem;
  color: var(--kalify-primary);
  border: 1px solid rgba(0, 223, 156, 0.4);
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, var(--kalify-primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .tagline {
  margin: 12px auto 0;
  color: var(--kalify-text-muted);
  font-size: 0.95rem;
  max-width: 540px;
}
.hero kbd {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.8rem;
  color: var(--kalify-text);
}

.game {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  gap: 16px;
  position: relative;
}

.scoreboard {
  display: flex;
  gap: 64px;
  margin-top: 8px;
}
.score { text-align: center; }
.score__label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--kalify-text-muted);
  margin-bottom: 4px;
}
.score__value {
  display: block;
  font-size: 3rem;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, SFMono-Regular, monospace;
}
.score--player .score__value { color: var(--kalify-secondary); text-shadow: 0 0 24px rgba(1, 14, 208, 0.5); }
.score--ai .score__value     { color: var(--kalify-primary);   text-shadow: 0 0 24px rgba(0, 223, 156, 0.5); }

#game {
  background: var(--kalify-navy);
  border: 1px solid rgba(0, 223, 156, 0.18);
  border-radius: var(--kalify-radius);
  box-shadow: 0 32px 80px -16px rgba(0, 0, 0, 0.6),
              0 0 0 1px rgba(255, 255, 255, 0.04);
  max-width: 100%;
  height: auto;
  cursor: none;
}

.controls {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.control {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--kalify-text-muted);
  text-transform: uppercase;
}
.control select {
  background: rgba(255, 255, 255, 0.06);
  color: var(--kalify-text);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.95rem;
  cursor: pointer;
}
.control select:focus {
  outline: 2px solid var(--kalify-primary);
  outline-offset: 2px;
}

.btn {
  appearance: none;
  border: none;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 12px 24px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 80ms ease, box-shadow 200ms ease, background 200ms ease;
}
.btn:focus-visible { outline: 2px solid var(--kalify-primary); outline-offset: 3px; }
.btn--primary {
  background: var(--kalify-primary);
  color: var(--kalify-navy);
  box-shadow: 0 8px 24px -8px rgba(0, 223, 156, 0.6);
}
.btn--primary:hover { transform: translateY(-1px); box-shadow: 0 12px 32px -8px rgba(0, 223, 156, 0.8); }
.btn--ghost {
  background: transparent;
  color: var(--kalify-text);
  border: 1px solid rgba(255, 255, 255, 0.16);
}
.btn--ghost:hover { background: rgba(255, 255, 255, 0.05); }

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 13, 49, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--kalify-radius);
}
.overlay[hidden] { display: none; }
.overlay__card {
  background: linear-gradient(180deg, rgba(19, 23, 70, 0.95), rgba(10, 13, 49, 0.95));
  border: 1px solid rgba(0, 223, 156, 0.25);
  border-radius: 16px;
  padding: 32px 40px;
  text-align: center;
  max-width: 380px;
}
.overlay__card h2 { margin: 0 0 8px; font-size: 1.5rem; }
.overlay__card p { margin: 0 0 20px; color: var(--kalify-text-muted); }

footer {
  text-align: center;
  padding: 16px 24px 24px;
  color: var(--kalify-text-muted);
  font-size: 0.8rem;
}
footer a { color: var(--kalify-primary); text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 600px) {
  .scoreboard { gap: 32px; }
  .score__value { font-size: 2.25rem; }
  .controls { gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}