:root {
  color-scheme: light;
  --bg: radial-gradient(circle at top, #3a4e91, #132342 70%);
  --text-main: #f6f5f7;
  --accent: #ffe6a6;
  --leaf-dark: #1c6f5b;
  --leaf-light: #43c59e;
  --fruit: #ff7a8a;
  --trunk: #4f2c1d;
  --shadow: rgba(12, 21, 31, 0.45);
  --cloud: rgba(255, 255, 255, 0.65);
  --pointer-x: 50;
  --pointer-y: 50;
  --pointer-strength: 0.35;
  --tree-glow: 0.45;
  --tree-tilt-x: 0deg;
  --tree-tilt-y: 0deg;
  --cloud-shift: 0;
  --tree-shift-x: 0px;
  --tree-shift-y: 0px;
  font-size: clamp(16px, 0.85vw + 14px, 19px);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Quicksand", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(1.5rem, 3vw, 3rem);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.grove {
  position: relative;
  width: min(720px, 90vw);
  aspect-ratio: 16 / 9;
  border-radius: clamp(1.5rem, 3vw, 2.75rem);
  overflow: hidden;
  background: radial-gradient(circle at 50% 18%, #4962ad 0%, #1d2851 60%, #0b1022);
  box-shadow: 0 30px 70px rgba(6, 10, 22, 0.55);
  isolation: isolate;
  perspective: 1200px;
  z-index: 0;
}

.grove::before,
.grove::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.grove::before {
  background: radial-gradient(
      circle at calc(var(--pointer-x) * 1%) calc(var(--pointer-y) * 1%),
      rgba(90, 154, 255, 0.28),
      rgba(11, 16, 29, 0) 52%
    );
  mix-blend-mode: screen;
  opacity: calc(0.25 + var(--pointer-strength) * 0.55);
  transition: opacity 0.45s ease;
}

.grove::after {
  background: radial-gradient(
      circle at calc(var(--pointer-x) * 1%) calc(var(--pointer-y) * 1%),
      rgba(104, 198, 166, 0.45),
      transparent 45%
    ),
    radial-gradient(circle at 50% 100%, rgba(72, 141, 92, 0.18), transparent 55%);
  mix-blend-mode: screen;
  opacity: calc(0.28 + var(--pointer-strength) * 0.6);
  transition: opacity 0.4s ease;
}

.grove__sky {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(104, 158, 231, 0.35), transparent 45%),
    radial-gradient(circle at top right, rgba(255, 206, 143, 0.55), transparent 55%),
    radial-gradient(circle at bottom, rgba(13, 26, 47, 0.8), rgba(6, 10, 22, 0.9));
  z-index: 1;
}

.grove__sun {
  position: absolute;
  width: clamp(120px, 14vw, 180px);
  aspect-ratio: 1 / 1;
  top: clamp(2rem, 4vw, 4rem);
  right: clamp(1.5rem, 3vw, 4rem);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, #ffeeba, rgba(255, 168, 105, 0.95), rgba(255, 255, 255, 0));
  filter: blur(1px);
  box-shadow: 0 0 45px rgba(255, 232, 175, 0.75);
  transform: translate3d(
    calc((var(--pointer-x) - 50) * 0.4px),
    calc((30 - var(--pointer-y)) * 0.4px),
    0
  );
  transition: transform 0.6s ease;
}

.cloud {
  position: absolute;
  width: clamp(180px, 22vw, 240px);
  height: clamp(90px, 10vw, 110px);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 35%, #ffffff, rgba(255, 255, 255, 0));
  opacity: 0.75;
  filter: blur(0.5px);
  animation: cloud-drift 38s linear infinite;
}

.cloud::before,
.cloud::after {
  content: "";
  position: absolute;
  background: inherit;
  border-radius: 50%;
}

.cloud::before {
  width: 55%;
  height: 55%;
  top: -25%;
  left: 12%;
}

.cloud::after {
  width: 65%;
  height: 65%;
  bottom: -15%;
  right: 15%;
}

.cloud--1 {
  top: clamp(12%, 15vw, 18%);
  left: calc(-30% + var(--cloud-shift));
  animation-duration: 44s;
}

.cloud--2 {
  top: clamp(26%, 22vw, 32%);
  left: calc(10% + var(--cloud-shift) / 2);
}

.cloud--3 {
  top: clamp(36%, 30vw, 42%);
  right: calc(-25% - var(--cloud-shift) / 1.5);
  animation-duration: 52s;
}

@keyframes cloud-drift {
  0% {
    transform: translateX(0);
  }
  50% {
    transform: translateX(25px);
  }
  100% {
    transform: translateX(0);
  }
}

.grove__ground {
  position: absolute;
  left: 0;
  right: 0;
  height: 45%;
  bottom: 0;
  background: radial-gradient(circle at calc(50% + var(--tree-shift-x)) 0%, rgba(69, 128, 92, 0.6), transparent 65%),
    linear-gradient(180deg, rgba(21, 39, 32, 0.8), rgba(14, 26, 22, 0.95));
  transform: translateY(10%);
  z-index: 2;
}

.grove__tree {
  position: absolute;
  left: 50%;
  bottom: 32%;
  width: clamp(220px, 30vw, 320px);
  aspect-ratio: 3 / 4;
  transform: translate(-50%, 36%) translateX(var(--tree-shift-x))
    translateY(calc(var(--tree-shift-y) - var(--pointer-strength) * 18px))
    rotateX(var(--tree-tilt-y)) rotateY(var(--tree-tilt-x));
  transform-style: preserve-3d;
  transition: transform 0.4s ease;
  will-change: transform;
  z-index: 3;
}

.tree__shadow {
  position: absolute;
  bottom: -22%;
  left: 50%;
  width: 150%;
  height: 38%;
  transform: translate(-50%, 0) scaleX(1.05);
  background: radial-gradient(circle, rgba(0, 0, 0, 0.45), transparent 65%);
  filter: blur(14px);
  opacity: calc(0.55 - var(--pointer-strength) * 0.18);
  transition: opacity 0.3s ease;
}

.tree__trunk {
  position: absolute;
  bottom: 18%;
  left: 50%;
  width: 18%;
  height: 55%;
  transform: translateX(-50%);
  background: linear-gradient(180deg, #6d412d, var(--trunk));
  border-radius: 999px;
  box-shadow: 0 0 25px rgba(78, 48, 32, 0.3) inset;
}

.tree__branch {
  position: absolute;
  width: 45%;
  height: 35%;
  bottom: 42%;
  background: linear-gradient(180deg, #6d412d, rgba(55, 32, 21, 0.9));
  border-radius: 999px;
}

.tree__branch--left {
  left: 28%;
  transform: rotate(28deg);
  transform-origin: right center;
}

.tree__branch--right {
  right: 28%;
  transform: rotate(-28deg);
  transform-origin: left center;
}

.tree__canopy {
  position: absolute;
  top: 5%;
  left: 50%;
  width: 120%;
  height: 60%;
  transform: translateX(-50%);
  background: radial-gradient(circle at 30% 30%, rgba(132, 233, 178, 0.45), transparent 65%),
    radial-gradient(circle at 70% 65%, rgba(111, 217, 205, 0.4), transparent 60%),
    radial-gradient(circle at 50% 50%, rgba(33, 161, 125, 0.95), rgba(16, 81, 67, 0.9));
  border-radius: 60% 65% 55% 65% / 60% 60% 55% 65%;
  box-shadow: 0 0 35px rgba(93, 211, 173, 0.35);
  filter: saturate(calc(0.75 + var(--pointer-strength)));
  overflow: hidden;
}

.tree__canopy::after {
  content: "";
  position: absolute;
  inset: -15%;
  background: radial-gradient(
    circle at calc(var(--pointer-x) * 1%) calc(var(--pointer-y) * 1%),
    rgba(190, 255, 224, 0.9),
    rgba(84, 170, 143, 0.15) 45%,
    transparent 65%
  );
  mix-blend-mode: screen;
  opacity: clamp(var(--tree-glow), 0.25, 1);
  transition: opacity 0.35s ease;
}

.tree__fruit {
  position: absolute;
  width: clamp(26px, 3vw, 34px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #ffe4e8, var(--fruit));
  box-shadow: 0 0 20px rgba(255, 140, 169, 0.5);
  animation: fruit-glow 4s ease-in-out infinite;
}

.tree__fruit--one {
  top: 35%;
  left: 32%;
  animation-delay: -0.5s;
}

.tree__fruit--two {
  top: 25%;
  right: 28%;
  animation-delay: -1.25s;
}

.tree__fruit--three {
  bottom: 32%;
  left: 50%;
  transform: translateX(-50%);
  animation-delay: -2s;
}

@keyframes fruit-glow {
  0%,
  100% {
    transform: scale(1);
    filter: brightness(calc(0.9 + var(--pointer-strength) * 0.6));
  }
  50% {
    transform: scale(1.08);
    filter: brightness(calc(1.2 + var(--pointer-strength)));
  }
}

.tree__sparkles {
  position: absolute;
  inset: 20% 25% 35% 25%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.7) 2px, transparent 8px);
  background-size: 50px 50px;
  mix-blend-mode: screen;
  opacity: calc(0.2 + var(--pointer-strength) * 0.7);
  filter: blur(0.3px);
  transition: opacity 0.4s ease;
}

.grove__fireflies {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 4;
}

.grove__fireflies span {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 226, 168, 0.9);
  box-shadow: 0 0 10px rgba(255, 226, 168, 0.9);
  animation: firefly 12s ease-in-out infinite;
}

.grove__fireflies span:nth-child(1) {
  top: 18%;
  left: 26%;
  animation-delay: -2s;
}

.grove__fireflies span:nth-child(2) {
  top: 42%;
  left: 70%;
  animation-delay: -4s;
}

.grove__fireflies span:nth-child(3) {
  top: 65%;
  left: 40%;
  animation-delay: -6s;
}

.grove__fireflies span:nth-child(4) {
  top: 30%;
  left: 55%;
  animation-delay: -8s;
}

.grove__fireflies span:nth-child(5) {
  top: 58%;
  left: 20%;
  animation-delay: -10s;
}

@keyframes firefly {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.8;
  }
  50% {
    transform: translate3d(20px, -30px, 0) scale(1.4);
    opacity: 0.2;
  }
}

@media (max-width: 780px) {
  body {
    padding: clamp(1rem, 4vw, 2rem);
  }

  .grove {
    width: min(540px, 96vw);
    aspect-ratio: 4 / 5;
  }

  .grove__sun {
    transform: translate3d(
      calc((var(--pointer-x) - 50) * 0.35px),
      calc((30 - var(--pointer-y)) * 0.35px),
      0
    );
  }

  .grove__tree {
    width: clamp(240px, 62vw, 320px);
    bottom: 28%;
  }
}

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

  .grove::before,
  .grove::after {
    opacity: 0.35;
  }
}