:root {
  --sky-top: #02020a;
  --sky-bottom: #0a1230;
  --cloud: rgba(26, 39, 68, 0.85);
  --tree: #040a08;
  --ground: #02060a;
  --candle: #fff8e7;
  --flame-core: #fff7d6;
  --flame-outer: #ffcc66;
  --text: #f4f1ea;
  --shadow: rgba(0, 0, 0, 0.35);
}

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

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--sky-top);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  user-select: none;
}

#viewport {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  overflow: hidden;
  background: linear-gradient(180deg, var(--sky-top) 0%, var(--sky-bottom) 100%);
}

#world {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 360vh;
  will-change: transform;
  transform: translateY(0);
}

.layer {
  position: absolute;
  left: 0;
  width: 100%;
  height: 100vh;
  pointer-events: none;
}

.layer > * {
  pointer-events: auto;
}

.layer-sky {
  top: 0;
  height: 100vh;
}

.sky-glow {
  position: absolute;
  top: -20vh;
  left: 50%;
  width: 120vw;
  height: 80vh;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(30, 45, 90, 0.35) 0%, transparent 70%);
  opacity: 0.6;
}

.stars-wrap {
  position: absolute;
  inset: 0;
}

.star {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 4px rgba(255, 255, 255, 0.6);
  opacity: 0;
  transform: scale(0.4);
  transition: opacity 1.2s ease, transform 1.2s ease;
  pointer-events: none;
}

.star.visible {
  opacity: 1;
  transform: scale(1);
}

.star.twinkle {
  animation: twinkle 2.4s ease-in-out infinite alternate;
}

.star.special {
  pointer-events: auto;
  cursor: pointer;
  transition: opacity 1.2s ease, transform 0.35s ease;
}

.star.special .star-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 12px 2px rgba(255, 240, 200, 0.7), 0 0 28px 8px rgba(255, 220, 150, 0.25);
}

.star.special::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 240%;
  height: 240%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 240, 200, 0.2) 0%, transparent 70%);
  animation: haloPulse 2.5s ease-in-out infinite;
}

.star.special:active,
.star.special.active {
  transform: scale(1.25);
}

@keyframes twinkle {
  0% { opacity: 0.55; }
  100% { opacity: 1; }
}

@keyframes haloPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.6; }
  50% { transform: translate(-50%, -50%) scale(1.25); opacity: 1; }
}

.layer-clouds {
  top: 100vh;
  height: 100vh;
}

.cloud {
  position: absolute;
  background: var(--cloud);
  border-radius: 50%;
  filter: blur(22px);
  opacity: 0.7;
}

.cloud-1 { width: 55vw; height: 18vh; top: 10%; left: -10%; }
.cloud-2 { width: 42vw; height: 14vh; top: 30%; left: 55%; }
.cloud-3 { width: 60vw; height: 22vh; top: 55%; left: 20%; opacity: 0.55; }
.cloud-4 { width: 35vw; height: 12vh; top: 75%; left: 70%; }
.cloud-5 { width: 48vw; height: 16vh; top: 85%; left: 5%; opacity: 0.5; }

.layer-trees {
  top: 200vh;
  height: 80vh;
}

.trees-svg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 30vh;
  animation: treeSway 6s ease-in-out infinite alternate;
}

@keyframes treeSway {
  0% { transform: translateX(-6px); }
  100% { transform: translateX(6px); }
}

.layer-ground {
  top: 280vh;
  height: 80vh;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.ground-hill {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 45vh;
  background: radial-gradient(ellipse at 50% 0%, #061812 0%, #02060a 70%);
  border-radius: 50% 50% 0 0 / 18% 18% 0 0;
  opacity: 0.85;
}

/* Fixed background star field — always visible as a starry night sky */
.bg-stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}

.bg-star {
  position: absolute;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 4px rgba(255, 255, 255, 0.6);
  opacity: 0;
  animation: bgTwinkle 3.5s ease-in-out infinite alternate;
}

@keyframes bgTwinkle {
  0% { opacity: 0.35; }
  100% { opacity: 0.9; }
}

#world { z-index: 1; }
#intro, #wish-text, #photo-card, #dialog-card, #ending, #mic-hint, #fireworks { z-index: 20; }

.cat-wrap, .cake-wrap {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  transform-origin: center bottom;
  will-change: transform, opacity;
}

.cat-wrap {
  width: min(60vw, 320px);
  bottom: 20vh;
  z-index: 2;
}

.cake-wrap {
  width: min(44vw, 240px);
  bottom: 24vh;
  z-index: 3;
}

.cat {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
  animation: breathe 3.2s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { transform: scale(1) translateY(0); }
  50% { transform: scale(1.012) translateY(-4px); }
}

#cat-tail {
  transform-origin: 20px 0;
  animation: tailWag 4s ease-in-out infinite;
}

@keyframes tailWag {
  0%, 100% { transform: translate(320px, 360px) rotate(-4deg); }
  50% { transform: translate(320px, 360px) rotate(6deg); }
}

.cake {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.candle-body {
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity 0.5s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.candle-slot.lit .candle-body,
.candle-slot.extinguished .candle-body {
  opacity: 1;
  transform: translateY(0);
}

.flame-outer, .flame-core {
  opacity: 0;
  transition: opacity 0.4s ease;
  transform-origin: center bottom;
}

.candle-slot.lit .flame-outer,
.candle-slot.lit .flame-core {
  opacity: 1;
}

.candle-slot.lit .flame-outer {
  animation: flameFlicker 0.7s ease-in-out infinite alternate;
}
.candle-slot.lit .flame-core {
  animation: flameFlicker 0.55s ease-in-out infinite alternate-reverse;
}

.candle-slot.special.lit .flame-outer {
  animation: flameFlickerBig 0.8s ease-in-out infinite alternate;
  filter: drop-shadow(0 0 12px rgba(255, 190, 80, 0.8)) drop-shadow(0 0 26px rgba(255, 160, 50, 0.45));
}
.candle-slot.special.lit .flame-core {
  animation: flameFlickerBig 0.6s ease-in-out infinite alternate-reverse;
}

@keyframes flameFlicker {
  0% { transform: scale(1) skewX(0deg); }
  100% { transform: scale(1.06, 0.96) skewX(3deg); }
}

@keyframes flameFlickerBig {
  0% { transform: scale(1) skewX(0deg); }
  100% { transform: scale(1.1, 0.94) skewX(4deg); }
}

.candle-slot.brighten .flame-outer,
.candle-slot.brighten .flame-core {
  filter: drop-shadow(0 0 14px rgba(255, 200, 90, 0.9)) drop-shadow(0 0 30px rgba(255, 170, 60, 0.55));
}

.candle-slot.extinguished .flame-outer,
.candle-slot.extinguished .flame-core {
  opacity: 0;
  animation: blowOut 0.45s ease forwards;
}

@keyframes blowOut {
  0% { transform: scale(1) skewX(0); opacity: 1; }
  40% { transform: scale(1.25, 1.35) skewX(-18deg); opacity: 0.9; }
  100% { transform: scale(0.1, 0.1) skewX(0); opacity: 0; }
}

.smoke {
  transition: opacity 1.2s ease, transform 1.8s ease;
}

.candle-slot.extinguished .smoke {
  opacity: 0.35;
  animation: smokeRise 2s ease forwards;
}

@keyframes smokeRise {
  0% { opacity: 0; transform: translateY(0) scale(0.8); }
  30% { opacity: 0.3; }
  100% { opacity: 0; transform: translateY(-35px) scale(1.2); }
}

/* Cat pose classes */
.cat-wrap.holding-cake #arm-left {
  transform: translate(130px, 330px) rotate(10deg) translateY(-10px);
  transition: transform 0.8s ease;
}
.cat-wrap.holding-cake #arm-right {
  transform: translate(290px, 330px) rotate(-10deg) translateY(-10px);
  transition: transform 0.8s ease;
}

.cat-wrap.looking-down #cat-head {
  transform: translate(210px, 165px) rotate(6deg);
  transition: transform 0.6s ease;
}
.cat-wrap.looking-up #cat-head {
  transform: translate(210px, 155px) rotate(-8deg);
  transition: transform 0.7s ease;
}

.cat-wrap.exit {
  animation: catExit 2.2s ease-in-out forwards;
}

@keyframes catExit {
  0% { transform: translateX(-50%) translateY(0); opacity: 1; }
  100% { transform: translateX(-50%) translateY(45vh); opacity: 0; }
}

#held-candle {
  transition: opacity 0.3s ease;
}

.cat-wrap.raise-right #arm-right {
  transform: translate(290px, 260px) rotate(-110deg);
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
.cat-wrap.raise-right #held-candle {
  opacity: 1;
}

.cat-wrap.insert-right #arm-right {
  transform: translate(290px, 340px) rotate(-20deg);
  transition: transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Camera movements */
#world.camera-down {
  animation: cameraDown 8.5s cubic-bezier(0.45, 0, 0.15, 1) forwards;
}

@keyframes cameraDown {
  0% { transform: translateY(0); }
  100% { transform: translateY(-240vh); }
}

.cake-forward .cake-wrap {
  animation: cakeForward 3.5s cubic-bezier(0.25, 0.1, 0.25, 1) forwards;
}

@keyframes cakeForward {
  0% { transform: translateX(-50%) scale(1) translateY(0); }
  100% { transform: translateX(-50%) scale(2.2) translateY(22vh); }
}

/* Overlays */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  pointer-events: none;
}

.overlay > * {
  pointer-events: auto;
}

.start-btn {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.82);
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 16px;
  letter-spacing: 1px;
  backdrop-filter: blur(4px);
  cursor: pointer;
  transition: background 0.3s ease, transform 0.3s ease, opacity 0.6s ease;
  animation: pulseBtn 2.5s ease-in-out infinite;
}

.start-btn:hover, .start-btn:active {
  background: rgba(255, 255, 255, 0.12);
  transform: scale(1.03);
}

.start-btn.hidden {
  opacity: 0;
  pointer-events: none;
}

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

.wish-text {
  position: fixed;
  left: 50%;
  top: 18%;
  transform: translateX(-50%);
  width: min(86vw, 520px);
  text-align: center;
  font-size: clamp(17px, 4.2vw, 26px);
  line-height: 1.7;
  color: var(--text);
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  z-index: 30;
  transition: opacity 1s ease, transform 1s ease;
  white-space: pre-line;
}

.wish-text.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.photo-card {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -45%) scale(0.96);
  width: min(78vw, 340px);
  max-height: 70vh;
  background: rgba(15, 20, 35, 0.85);
  border-radius: 18px;
  padding: 10px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease, transform 0.5s ease;
  z-index: 60;
  backdrop-filter: blur(8px);
}

.photo-card.open {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.photo-card img {
  display: block;
  width: 100%;
  border-radius: 12px;
  object-fit: contain;
  max-height: 60vh;
}

.photo-close {
  position: absolute;
  top: -34px;
  right: 0;
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
}

.dialog-card {
  position: fixed;
  left: 50%;
  bottom: 6vh;
  transform: translateX(-50%) translateY(20px);
  width: min(92vw, 520px);
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: rgba(18, 24, 40, 0.88);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 16px 18px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.7s ease, transform 0.7s ease;
  z-index: 40;
}

.dialog-card.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dialog-avatar {
  width: 58px;
  height: 58px;
  flex-shrink: 0;
  border-radius: 50%;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
}

.dialog-avatar svg {
  width: 100%;
  height: 100%;
}

.dialog-content {
  flex: 1;
  font-size: 17px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.95);
}

.dialog-content p {
  margin: 0;
}

.mic-hint {
  position: fixed;
  top: 12%;
  left: 50%;
  transform: translateX(-50%);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: 35;
  pointer-events: none;
}

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

.ending {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6vw;
  pointer-events: none;
  z-index: 45;
}

.ending-line {
  position: absolute;
  width: min(88vw, 620px);
  font-size: clamp(19px, 5vw, 32px);
  line-height: 1.75;
  color: var(--text);
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 1.2s ease, transform 1.2s ease;
  white-space: pre-line;
}

.ending-line.show {
  opacity: 1;
  transform: translateY(0);
}

.ending-line.big {
  font-size: clamp(26px, 7vw, 48px);
  font-weight: 500;
}

.fireworks {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 20;
}

/* Final dim */
#viewport.final-dim {
  animation: finalDim 2.5s ease forwards;
}

@keyframes finalDim {
  0% { filter: brightness(1); }
  100% { filter: brightness(0.15); }
}

@media (max-width: 480px) {
  .cat-wrap { width: 66vw; bottom: 6vh; }
  .cake-wrap { width: 50vw; bottom: 10vh; }
  .dialog-content { font-size: 15px; }
  .wish-text { top: 14%; }
}

@media (max-height: 500px) {
  .cat-wrap { width: 42vh; }
  .cake-wrap { width: 30vh; bottom: 8vh; }
}