* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  overflow: hidden;
  font-family: "Trebuchet MS", Arial, sans-serif;
  background: #063b5b;
}

.ocean {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 50% -10%, rgba(255,255,255,.55), transparent 25%),
    linear-gradient(180deg, #72d8ec 0%, #1c9fc6 32%, #08759f 68%, #034b70 100%);
}

.sunlight {
  position: absolute;
  top: -25vh;
  left: 50%;
  width: 70vw;
  height: 80vh;
  transform: translateX(-50%);
  background: linear-gradient(110deg, transparent 20%, rgba(255,255,255,.16), transparent 48%);
  filter: blur(12px);
  animation: lightMove 7s ease-in-out infinite alternate;
  z-index: -1;
}

.welcome {
  position: relative;
  z-index: 10;
  width: min(680px, 90%);
  margin: 0 auto;
  padding-top: 17vh;
  text-align: center;
  color: white;
  text-shadow: 0 3px 12px rgba(0, 50, 80, .3);
}

.eyebrow {
  letter-spacing: 5px;
  font-size: .85rem;
  font-weight: bold;
  margin-bottom: 14px;
  animation: fadeDown 1s ease both;
}

h1 {
  font-size: clamp(3.2rem, 9vw, 7rem);
  line-height: .95;
  font-weight: 900;
  animation: titleFloat 3s ease-in-out infinite;
}

h2 {
  font-size: clamp(1.7rem, 4vw, 3rem);
  margin-top: 10px;
  font-weight: 500;
  animation: fadeUp 1s .2s ease both;
}

.description {
  max-width: 570px;
  margin: 25px auto;
  line-height: 1.7;
  font-size: 1.05rem;
  animation: fadeUp 1s .4s ease both;
}

button {
  border: 0;
  padding: 15px 28px;
  border-radius: 999px;
  background: rgba(255,255,255,.92);
  color: #056b8e;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(0, 40, 70, .2);
  transition: transform .25s, box-shadow .25s;
  animation: fadeUp 1s .6s ease both;
}

button:hover {
  transform: translateY(-5px) scale(1.04);
  box-shadow: 0 15px 30px rgba(0, 40, 70, .3);
}

button span {
  display: inline-block;
  margin-left: 8px;
  animation: arrow 1s ease-in-out infinite;
}

.fish, .jellyfish, .turtle, .whale,
.crab, .octopus, .coral, .shell, .starfish {
  position: absolute;
  user-select: none;
  pointer-events: none;
}

.fish {
  font-size: clamp(2rem, 4vw, 4rem);
  z-index: 4;
}

.fish-one {
  top: 25%;
  left: -8%;
  animation: swimRight 14s linear infinite;
}

.fish-two {
  top: 43%;
  right: -8%;
  transform: scaleX(-1);
  animation: swimLeft 17s linear infinite;
}

.fish-three {
  top: 57%;
  left: -10%;
  font-size: 3rem;
  animation: swimRight 20s 4s linear infinite;
}

.fish-four {
  top: 72%;
  right: -8%;
  font-size: 2.5rem;
  transform: scaleX(-1);
  animation: swimLeft 13s 2s linear infinite;
}

.jellyfish {
  font-size: 4rem;
  opacity: .9;
  z-index: 3;
}

.jelly-one {
  left: 8%;
  top: 55%;
  animation: jellyFloat 4s ease-in-out infinite;
}

.jelly-two {
  right: 10%;
  top: 30%;
  font-size: 3rem;
  animation: jellyFloat 5s 1s ease-in-out infinite;
}

.turtle {
  left: 18%;
  top: 36%;
  font-size: 3.2rem;
  animation: turtleSwim 18s linear infinite;
}

.whale {
  right: 12%;
  top: 17%;
  font-size: 5rem;
  opacity: .45;
  animation: whaleFloat 6s ease-in-out infinite;
}

.bubble {
  position: absolute;
  bottom: -40px;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(255,255,255,.65);
  border-radius: 50%;
  z-index: 5;
  animation: bubbleUp linear infinite;
}

.bubble-1 { left: 12%; animation-duration: 7s; }
.bubble-2 { left: 29%; width: 8px; height: 8px; animation-duration: 10s; animation-delay: 2s; }
.bubble-3 { left: 52%; width: 18px; height: 18px; animation-duration: 8s; animation-delay: 1s; }
.bubble-4 { left: 67%; animation-duration: 11s; animation-delay: 4s; }
.bubble-5 { left: 82%; width: 7px; height: 7px; animation-duration: 6s; animation-delay: 1s; }
.bubble-6 { left: 43%; width: 9px; height: 9px; animation-duration: 9s; animation-delay: 3s; }

.sea-floor {
  position: absolute;
  z-index: 6;
  left: -5%;
  bottom: -6vh;
  width: 110%;
  height: 21vh;
  background: linear-gradient(180deg, #d9c28a, #a98658);
  border-radius: 50% 50% 0 0 / 25% 25% 0 0;
  box-shadow: 0 -15px 35px rgba(0, 35, 50, .15);
}

.sand {
  position: absolute;
  top: -10px;
  left: 0;
  width: 100%;
  height: 25px;
  background: radial-gradient(ellipse, rgba(255,255,255,.2), transparent 65%);
}

.coral, .crab, .octopus, .shell, .starfish {
  font-size: 3rem;
}

.coral-one {
  left: 8%;
  bottom: 5vh;
  animation: sway 2.5s ease-in-out infinite;
}

.coral-two {
  left: 76%;
  bottom: 4vh;
  font-size: 4rem;
  animation: sway 3s .5s ease-in-out infinite;
}

.crab {
  left: 38%;
  bottom: 3vh;
  animation: crabWalk 5s ease-in-out infinite;
}

.octopus {
  right: 19%;
  bottom: 2vh;
  font-size: 3.7rem;
  animation: octopusBounce 2.5s ease-in-out infinite;
}

.shell {
  left: 57%;
  bottom: 3vh;
  font-size: 2rem;
  transform: rotate(-12deg);
}

.starfish {
  left: 24%;
  bottom: 2vh;
  font-size: 1.8rem;
  transform: rotate(15deg);
}

.message {
  position: absolute;
  z-index: 20;
  left: 50%;
  bottom: -100px;
  transform: translateX(-50%);
  width: min(500px, 85%);
  padding: 16px 22px;
  border-radius: 20px;
  background: rgba(255,255,255,.92);
  color: #075d7c;
  text-align: center;
  font-weight: bold;
  box-shadow: 0 10px 30px rgba(0,40,60,.2);
  transition: bottom .6s ease;
}

.message.show {
  bottom: 28px;
}

.message span {
  margin-right: 8px;
}

@keyframes swimRight {
  0% { transform: translateX(-10vw) translateY(0); }
  25% { transform: translateX(30vw) translateY(-25px); }
  50% { transform: translateX(60vw) translateY(15px); }
  75% { transform: translateX(90vw) translateY(-20px); }
  100% { transform: translateX(120vw) translateY(0); }
}

@keyframes swimLeft {
  0% { transform: translateX(10vw) translateY(0) scaleX(-1); }
  25% { transform: translateX(-30vw) translateY(20px) scaleX(-1); }
  50% { transform: translateX(-60vw) translateY(-15px) scaleX(-1); }
  75% { transform: translateX(-90vw) translateY(20px) scaleX(-1); }
  100% { transform: translateX(-120vw) translateY(0) scaleX(-1); }
}

@keyframes turtleSwim {
  0% { transform: translateX(-20vw) rotate(3deg); }
  50% { transform: translateX(65vw) translateY(-30px) rotate(-3deg); }
  100% { transform: translateX(115vw) rotate(3deg); }
}

@keyframes jellyFloat {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(-35px) rotate(3deg); }
}

@keyframes whaleFloat {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50% { transform: translateY(25px) rotate(3deg); }
}

@keyframes bubbleUp {
  0% { transform: translateY(0) scale(.7); opacity: 0; }
  15% { opacity: .8; }
  100% { transform: translateY(-115vh) scale(1.2); opacity: 0; }
}

@keyframes titleFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(25px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes arrow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

@keyframes lightMove {
  from { transform: translateX(-55%) rotate(-4deg); }
  to { transform: translateX(-45%) rotate(4deg); }
}

@keyframes sway {
  0%, 100% { transform: rotate(-5deg); }
  50% { transform: rotate(5deg); }
}

@keyframes crabWalk {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(40px); }
}

@keyframes octopusBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-15px); }
}

@media (max-width: 600px) {
  .welcome {
    padding-top: 14vh;
  }

  .description {
    font-size: .95rem;
    padding: 0 10px;
  }

  .whale {
    right: -5%;
    font-size: 3.5rem;
  }

  .turtle {
    left: 4%;
    font-size: 2.2rem;
  }

  .jelly-one {
    left: 2%;
    font-size: 2.8rem;
  }

  .sea-floor {
    height: 18vh;
  }
}