:root {
  --deep: #021F43;
  --wave1: #48CAE4;
  --wave2: #ADE8F4;
  --green: #43A047;
  --blue: #0074D9;
}

/* Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: system-ui, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--deep);
  color: #E6F4FF;
}

/* Title Home Link */
.home-link {
  color: #fff;
  text-decoration: none;
  font-weight: 900;
  font-size: clamp(32px, 6vw, 60px);
  text-shadow: 0 4px 22px rgba(0,0,0,.45);
}
.home-link:hover {
  text-decoration: underline;
}

/* HERO (Buttons) */
.hero {
  position: relative;
  z-index: 2;
  overflow: hidden;
  min-height: 56vh;
  text-align: center;
  padding: 6rem 1rem 10rem;
  background: linear-gradient(180deg,#0460C9,#03336B 60%, var(--deep));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.hero h1 {
  font-weight: 900;
  font-size: clamp(32px,6vw,60px);
  margin-bottom: .5rem;
}
.auth-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  margin-top: 1.5rem;
}
.btn {
  display: inline-block;
  padding: .8rem 1.4rem;
  border-radius: .8rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0,0,0,.25);
  transition: transform .2s, box-shadow .2s;
}
.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 22px rgba(0,0,0,.35);
}
.btn-login { background: var(--blue); }
.btn-register { background: var(--green); }

/* Clouds */
.clouds {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 180px;
  pointer-events: none;
  overflow: hidden;
  z-index: 2;
}
.cloud {
  position: absolute;
  top: 20px;
  opacity: .75;
  width: 260px;
}
.cloud1 {
  left: -300px;
  animation: float-right 60s linear infinite;
}
.cloud2 {
  right: -300px;
  left: auto;
  animation: float-left 80s linear infinite;
}

/* Keyframes for Cloud Animation */
@keyframes float-right {
  from { transform: translateX(0); }
  to   { transform: translateX(120vw); }
}
@keyframes float-left {
  from { transform: translateX(0); }
  to   { transform: translateX(-120vw); }
}

/* Waves */
.waves {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 200px;
  overflow: hidden;
  pointer-events: none;
  z-index: 3;
}
.wave {
  position: absolute;
  bottom: 0;
  width: 160%;
  height: 100%;
  left: -30%;
}
.wave svg {
  width: 100%;
  height: 100%;
  display: block;
}
.wave.back path { fill: var(--wave2); }
.wave.front path { fill: var(--wave1); }
.wave.back {
  z-index: 1;
  animation: rollL 9s ease-in-out infinite, bobS 6s ease-in-out infinite;
}
.wave.front {
  z-index: 3;
  animation: rollR 7s ease-in-out infinite, bobB 5s ease-in-out infinite;
}

/* Keyframes for Waves Animation */
@keyframes rollL {
  0%,100% { transform: translateX(-14%); }
  50%     { transform: translateX(14%); }
}
@keyframes rollR {
  0%,100% { transform: translateX(14%); }
  50%     { transform: translateX(-14%); }
}
@keyframes bobS {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(20px); }
}
@keyframes bobB {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(28px); }
}

/* Boat */
.boat-wrap {
  position: absolute;
  left: 40px;
  bottom: 8px;
  z-index: 2;
  pointer-events: none;
  animation: boat-drift 38s linear infinite alternate, boat-bob 6s ease-in-out infinite;
}
.boat {
  width: clamp(220px,26vw,360px);
  display: block;
  filter: drop-shadow(0 8px 18px rgba(0,0,0,.35));
}

/* Keyframes for Boat Animation */
@keyframes boat-bob {
  0%,100% { transform: translateY(0) rotate(-.5deg); }
  50%     { transform: translateY(-4px) rotate(.5deg); }
}
@keyframes boat-drift {
  0%   { transform: translateX(0); }
  100% { transform: translateX(40px); }
}
@media (max-width: 640px) { .boat-wrap { display:none; } }
@media (prefers-reduced-motion: reduce) { .boat-wrap { animation: none; } }

/* Section + Bubble Bed */
.section {
  position: relative;
  background: linear-gradient(180deg, var(--wave1) 0%, #1b6ec2 15%, #034a93 35%, #022b63 60%, var(--deep) 100%);
  padding: 3rem 1rem 6rem;
  min-height: 50vh;
  overflow: hidden;
}
.container {
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}
.bubble-bed {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to top, black 0 86%, transparent 100%);
          mask-image: linear-gradient(to top, black 0 86%, transparent 100%);
}
.bubble {
  position: absolute;
  bottom: -40px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 28%, #fff 0 25%, rgba(255,255,255,.6) 26% 50%, rgba(255,255,255,0) 60% 100%), #CFF3FF;
  box-shadow: 0 0 8px rgba(255,255,255,.25);
  opacity: 0;
  animation: rise linear infinite;
}

/* Keyframes for Bubble Animation */
@keyframes rise {
  0%   { opacity: 0; transform: translateY(0) scale(1); }
  10%  { opacity: .9; }
  100% { opacity: 0; transform: translateY(-90vh) scale(1.2); }
}

/* Diver */
.diver-wrap {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 10;
  animation: sway 8s ease-in-out infinite;
  transform-origin: center;
}
.diver-wrap:hover {
  transform: scale(1.05) rotate(0deg);
  transition: transform .3s ease;
}
.diver {
  width: clamp(120px,18vw,260px);
  filter: drop-shadow(0 10px 20px rgba(0,0,0,.35));
  animation: bob 4.6s ease-in-out infinite;
}

/* Keyframes for Diver Animation */
@keyframes bob {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(-12px); }
}
@keyframes sway {
  0%,100% { transform: translateX(0) rotate(-2deg); }
  50%     { transform: translateX(-8px) rotate(2deg); }
}
@media (prefers-reduced-motion: reduce) {
  .diver, .diver-wrap { animation: none; }
}