/* ==========================================================
   site.css - Core styles, variables, reset & top controls
   Thiệp Trung Thu Tương Tác - Tường Duy
   ========================================================== */

:root {
  --bg-dark: #060913;
  --bg-night: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
  --bg-floating: radial-gradient(
    circle at 50% 40%,
    #151c33 0%,
    #0a0d1a 60%,
    #03050c 100%
  );
  --gold-primary: #ffd166;
  --gold-glow: rgba(255, 209, 102, 0.5);
  --gold-bright: #ffea79;
  --pink-soft: #ff85a1;
  --pink-glow: rgba(255, 133, 161, 0.45);
  --text-white: #ffffff;
  --text-gold: #fcf4dd;
  --font-heading: "Dancing Script", "Playfair Display", cursive, serif;
  --font-body:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  --control-size: 46px;
  --safe-top: env(safe-area-inset-top, 16px);
  --safe-bottom: env(safe-area-inset-bottom, 16px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  width: 100%;
  height: 100%;
  height: 100dvh;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: var(--bg-dark);
  font-family: var(--font-body);
  color: var(--text-white);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

#app-container {
  position: relative;
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg-night);
}

/* ==========================================================
   Scene Layering
   ========================================================== */
.scene {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.8s ease;
  z-index: 10;
}

.scene.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* Canvas layers for particles */
#particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 40;
  pointer-events: none;
}

/* ==========================================================
   Top Controls Bar (Sound, Heart, Gift)
   Touch target >= 44x44px for Mobile
   ========================================================== */
.top-controls {
  position: absolute;
  top: var(--safe-top);
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 18px;
  z-index: 100;
  pointer-events: none;
}

.controls-left,
.controls-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ctrl-btn {
  pointer-events: auto;
  width: var(--control-size);
  height: var(--control-size);
  min-width: 44px;
  min-height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.35);
  transition:
    transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275),
    background 0.25s ease,
    box-shadow 0.25s ease;
  outline: none;
}

.ctrl-btn:active {
  transform: scale(0.92);
}

.ctrl-btn svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Specific button styles */
#btn-sound {
  color: var(--gold-bright);
}

#btn-heart {
  color: var(--pink-soft);
  animation: heartIconPulse 2s ease-in-out infinite;
}

#btn-heart svg {
  fill: rgba(255, 133, 161, 0.3);
}

#btn-gift {
  color: #ffd166;
  animation: giftBounce 2.5s ease-in-out infinite;
  position: relative;
}

#btn-gift::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(255, 209, 102, 0.6) 0%,
    transparent 70%
  );
  z-index: -1;
  animation: giftGlow 2.5s ease-in-out infinite;
}

/* Gift Button Wrapper & Hint Guide */
.gift-btn-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}

.gift-hint-bubble {
  position: absolute;
  top: calc(100% + 14px);
  right: -6px;
  white-space: nowrap;
  background: linear-gradient(135deg, #ffd166 0%, #ff85a1 100%);
  color: #2b1118;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.3px;
  padding: 8px 16px;
  border-radius: 20px;
  box-shadow:
    0 8px 25px rgba(255, 133, 161, 0.65),
    0 0 16px rgba(255, 209, 102, 0.5);
  border: 1.5px solid rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 150;
  pointer-events: auto;
  cursor: pointer;
  opacity: 0;
  transform: translateY(-8px) scale(0.9);
  transition:
    opacity 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
    transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  animation: giftHintFloat 2.2s ease-in-out infinite;
}

.gift-hint-bubble.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.gift-hint-bubble .gift-hint-arrow {
  position: absolute;
  top: -6px;
  right: 22px;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 7px solid #ffd166;
}

@keyframes giftHintFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(5px);
  }
}

@keyframes heartIconPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.12);
    filter: drop-shadow(0 0 6px var(--pink-glow));
  }
}

@keyframes giftBounce {
  0%,
  100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-4px) rotate(-6deg);
  }
  50% {
    transform: translateY(0);
  }
  70% {
    transform: translateY(-3px) rotate(6deg);
  }
}

@keyframes giftGlow {
  0%,
  100% {
    opacity: 0.3;
    transform: scale(0.9);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.15);
  }
}

/* Audio Fallback Notice */
.audio-hint {
  position: absolute;
  top: calc(var(--safe-top) + 60px);
  right: 18px;
  background: rgba(0, 0, 0, 0.65);
  color: var(--text-gold);
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 12px;
  backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
  z-index: 101;
}

.audio-hint.show {
  opacity: 1;
}