/* ═══════════════════════════════════════════════════
   ENHANCEMENTS — UI/UX, Gameplay, Performance
   Bond & Awareness v2
   ═══════════════════════════════════════════════════ */

/* ── PERFORMANCE: GPU acceleration for key elements ── */
.card-3d,
.card-face,
.card-scene,
.screen.active,
.screen.entering,
.screen.exit {
  will-change: transform, opacity;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

/* Reduce paint on static canvases */
canvas {
  contain: strict;
}

/* ── CARD: enhanced flip with spring-like bounce ── */
.card-3d {
  transition: transform 0.55s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

.card-3d.is-flipped {
  transform: rotateY(180deg) !important;
}

/* Card entrance pulse */
@keyframes cardEntrance {
  0% { transform: scale(0.92); opacity: 0; filter: blur(4px); }
  60% { transform: scale(1.02); opacity: 1; filter: blur(0); }
  100% { transform: scale(1); opacity: 1; filter: blur(0); }
}
.card-scene:not(.swipe-in-right):not(.swipe-in-left) .card-3d:not(.is-flipped) {
  animation: cardEntrance 0.5s ease-out;
}

/* ── Card tap feedback glow ── */
.card-3d:active {
  filter: brightness(1.08);
  transition: filter 0.08s ease !important;
}

/* ── SWIPE: smoother card transitions ── */
.card-scene.swipe-in-right .card-3d {
  animation: swipeRight 0.38s cubic-bezier(0.22, 1, 0.36, 1) !important;
}
.card-scene.swipe-in-left .card-3d {
  animation: swipeLeft 0.38s cubic-bezier(0.22, 1, 0.36, 1) !important;
}

@keyframes swipeRight {
  0% { transform: translateX(80px) scale(0.9); opacity: 0; }
  100% { transform: translateX(0) scale(1); opacity: 1; }
}
@keyframes swipeLeft {
  0% { transform: translateX(-80px) scale(0.9); opacity: 0; }
  100% { transform: translateX(0) scale(1); opacity: 1; }
}

/* ── GAMEPLAY: Question progress indicator ── */
.question-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: rgba(255,255,255,0.04);
  z-index: 50;
  overflow: hidden;
}
.question-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #1B9AAA, #48CAE4, #9B5DE5);
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  border-radius: 0 1px 1px 0;
  box-shadow: 0 0 8px rgba(72,202,228,0.4);
}

/* ── GAMEPLAY: Question counter badge ── */
.question-counter {
  position: absolute;
  top: 0.6rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: rgba(72,202,228,0.45);
  text-transform: uppercase;
  z-index: 51;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

/* ── ANSWER INPUT: improved focus state ── */
.answer-input:focus {
  border-color: rgba(72,202,228,0.5) !important;
  box-shadow: 0 0 0 2px rgba(72,202,228,0.12), 0 0 20px rgba(72,202,228,0.08) !important;
  background: rgba(255,255,255,0.06) !important;
  transition: all 0.25s ease !important;
}

/* Send button entrance */
.btn-send {
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s ease !important;
}
.btn-send:active {
  transform: scale(0.85) !important;
}

/* ── GAMEPLAY: Answer submitted pulse ── */
@keyframes answerPulse {
  0% { box-shadow: 0 0 0 0 rgba(72,202,228,0.35); }
  70% { box-shadow: 0 0 0 10px rgba(72,202,228,0); }
  100% { box-shadow: 0 0 0 0 rgba(72,202,228,0); }
}
.answer-sent-pulse {
  animation: answerPulse 0.6s ease-out;
}

/* ── Next question button: improved feel ── */
.btn-next-q {
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1),
              background 0.2s ease,
              box-shadow 0.2s ease !important;
}
.btn-next-q:hover {
  transform: translateY(-1px) !important;
  box-shadow: 0 4px 16px rgba(72,202,228,0.2) !important;
}
.btn-next-q:active {
  transform: translateY(0) scale(0.97) !important;
}

/* ── GAMEPLAY: Session timer ring ── */
.session-timer {
  position: fixed;
  bottom: max(1rem, env(safe-area-inset-bottom, 1rem));
  right: 1rem;
  width: 38px;
  height: 38px;
  z-index: 60;
  pointer-events: none;
  opacity: 0.35;
  transition: opacity 0.3s ease;
}
.session-timer svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}
.session-timer-track {
  fill: none;
  stroke: rgba(255,255,255,0.06);
  stroke-width: 2.5;
}
.session-timer-fill {
  fill: none;
  stroke: #48CAE4;
  stroke-width: 2.5;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s linear;
}
.session-timer-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.52rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.02em;
}

/* When game is active, show the timer more */
#game.active .session-timer {
  opacity: 0.55;
}
#game.active .session-timer:hover {
  opacity: 0.85;
}

/* ── UI: Opponent answer reveal animation ── */
@keyframes answerReveal {
  0% { 
    transform: translateY(12px) scale(0.96); 
    opacity: 0;
    filter: blur(3px);
  }
  100% { 
    transform: translateY(0) scale(1); 
    opacity: 1;
    filter: blur(0);
  }
}
.opponent-answer-box {
  animation: answerReveal 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ── UI: Typing indicator improved ── */
.typing-indicator {
  animation: answerReveal 0.3s ease-out;
}

/* ── UI: Toast notifications improved ── */
.toast {
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
}

/* ── UI: Mode selection buttons — tactile feedback ── */
.mode-card:active,
.lang-btn:active,
.btn-primary:active {
  transform: scale(0.96) !important;
  transition: transform 0.1s ease !important;
}

/* ── PERFORMANCE: Reduce animation on prefer-reduced-motion ── */
@media (prefers-reduced-motion: reduce) {
  .card-3d {
    transition-duration: 0.15s !important;
  }
  .card-scene.swipe-in-right .card-3d,
  .card-scene.swipe-in-left .card-3d {
    animation-duration: 0.15s !important;
  }
  .opponent-answer-box,
  .typing-indicator {
    animation: none !important;
  }
  canvas {
    display: none !important;
  }
  .question-progress-fill {
    transition-duration: 0.1s !important;
  }
}

/* ── PERFORMANCE: Low power / battery saver ── */
@media (prefers-reduced-motion: reduce), (hover: none) and (pointer: coarse) {
  .card-3d:not(.is-flipped):not(.dragging):hover {
    transform: none !important;
  }
}

/* ── UI: Better offline player chips ── */
.offline-player-chip.active {
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
  transform: scale(1.08);
}

/* ── GAMEPLAY: Fruit sync celebration ── */
@keyframes fruitPop {
  0% { transform: scale(0.5) rotate(-15deg); opacity: 0; }
  50% { transform: scale(1.15) rotate(5deg); opacity: 1; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}
.fruit-sync-icon {
  animation: fruitPop 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── UI: Smooth scroll for instructions ── */
.instructions-scroll {
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

/* ── UI: Welcome screen — stagger entrance ── */
#welcome.active .welcome-tagline {
  animation: fadeSlideUp 0.6s ease-out 0.1s both;
}
#welcome.active .welcome-title {
  animation: fadeSlideUp 0.6s ease-out 0.2s both;
}
#welcome.active .welcome-subtitle {
  animation: fadeSlideUp 0.6s ease-out 0.3s both;
}

@keyframes fadeSlideUp {
  0% { transform: translateY(16px); opacity: 0; }
  100% { transform: translateY(0); opacity: 1; }
}