body[data-theme=underwater] {
  color-scheme: dark;
  --bg:#082c42;
  --surface:#123e56;
  --surface-soft:#194e63;
  --text:#effcf9;
  --muted:#bbd9df;
  --border:#40788b;
  --p1:#ffd17e;
  --p2:#a6d6ff;
  --p1-fill:#ffc96c22;
  --p2-fill:#8dd6ff22;
  --dot:#ddfff5;
  --idle:#73acb8;
  --safe:#98e4b1;
  --scoring:#ffda92;
  --accent:#9ee9d8;
  background:
    radial-gradient(
      ellipse at 20% 5%,
      #146b7c88,
      transparent 55%),
    linear-gradient(
      #0c3e58,
      #082b43 65%,
      #0b3448);
}
.sea-scene,
.sea-tip,
.sea-reward {
  display: none;
  pointer-events: none;
}
body[data-theme=underwater] .app-shell {
  max-width: 1080px;
  padding-top: 0;
}
body[data-theme=underwater] .topbar {
  background: #103e55e8;
  border: 1px solid #45869870;
  border-top: 0;
  border-radius: 0 0 26px 26px;
  padding: 18px 22px;
  box-shadow: 0 5px 0 #072c4240;
}
body[data-theme=underwater] .brand svg {
  fill: #d9fff0;
  stroke: #9ae4d7;
}
body[data-theme=underwater] nav button {
  border-radius: 24px;
}
body[data-theme=underwater] nav .outline {
  border-color: #71b6b5;
}
body[data-theme=underwater] .intro {
  isolation: isolate;
  position: relative;
  overflow: hidden;
  min-height: 210px;
  padding: 28px 30px;
  border: 1px solid #64b4b970;
  border-radius: 27px;
  background:
    radial-gradient(
      ellipse at 80% 0,
      #3ba3ad88,
      transparent 65%),
    linear-gradient(
      110deg,
      #12556c,
      #18475f);
  box-shadow: 0 6px 0 #082c4266;
  align-items: center;
  margin-top: 28px;
}
body[data-theme=underwater] .intro > div:first-child {
  position: relative;
  z-index: 2;
  max-width: 56%;
}
body[data-theme=underwater] h1 {
  white-space: pre-line;
  line-height: 1.1;
  font-size: clamp(28px, 3.7vw, 38px);
  letter-spacing: -.04em;
}
body[data-theme=underwater] .eyebrow {
  color: #b3eedb;
  font-size: 10px;
  letter-spacing: .15em;
}
body[data-theme=underwater] .sea-tip {
  display: block;
  font-size: 12px;
  line-height: 1.6;
  max-width: 290px;
  color: #c5e9e9;
  margin: 12px 0 0;
}
body[data-theme=underwater] .preferences {
  z-index: 2;
  position: relative;
  align-self: flex-end;
  max-width: 420px;
}
body[data-theme=underwater] .preferences button,
body[data-theme=underwater] .preferences select {
  background: #103d55ed;
  border-color: #6ca6af;
}
body[data-theme=underwater] .sea-scene {
  display: block;
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.sea-swimmer {
  position: absolute;
  width: 92px;
  height: 92px;
  filter: drop-shadow(0 4px 5px #062c4133);
  animation: reef-swim 7s ease-in-out infinite;
}
.swimmer-0 {
  right: 18%;
  top: 6px;
  width: 102px;
  height: 102px;
  animation-delay: -2s;
}
.swimmer-1 {
  right: 3%;
  top: 35px;
  width: 74px;
  height: 74px;
  animation-delay: -4s;
}
.swimmer-2 {
  right: 34%;
  top: 35px;
  width: 70px;
  height: 70px;
  animation: reef-bob 6s ease-in-out infinite;
}
.swimmer-3 {
  right: 11%;
  top: 110px;
  width: 62px;
  height: 62px;
  animation-delay: -1s;
}
.sea-bubble {
  position: absolute;
  bottom: -35px;
  left: calc(48% + var(--i)*7%);
  width: calc(5px + var(--i)*2px);
  height: calc(5px + var(--i)*2px);
  border: 1px solid #c1faff66;
  border-radius: 50%;
  box-shadow: inset 2px 2px 0 #e3ffff20;
  animation: reef-bubble calc(7s + var(--i)*.7s) linear infinite;
  animation-delay: calc(var(--i)*-1.8s);
}
body[data-theme=underwater] .player {
  background:
    linear-gradient(
      120deg,
      #16475e,
      #123e56);
  border-radius: 22px;
  border-width: 1px;
  box-shadow: 0 4px 0 #062a3e66;
}
body[data-theme=underwater] .avatar {
  border-radius: 50%;
  background: #28607866;
  box-shadow: inset 0 2px 1px #a9e8e92b;
}
body[data-theme=underwater] .table {
  border: 2px solid #5ca0ad8a;
  border-radius: 28px;
  background: #124a62 url(./assets/underwater.svg) center/100% 100% no-repeat;
  box-shadow: 0 6px 0 #06263d, 0 18px 45px #041c323b;
  padding: 23px 26px 25px;
}
body[data-theme=underwater] .board-wrap {
  max-width: 490px;
  margin: 24px auto 16px;
}
body[data-theme=underwater] .table-heading {
  font-weight: 650;
}
body[data-theme=underwater] .table .small {
  color: #b5e0e6;
}
body[data-theme=underwater] #board .edge {
  stroke: #7db0bd;
  opacity: .65;
  stroke-width: 2;
  stroke-dasharray: 2 7;
}
body[data-theme=underwater] #board .edge.safe {
  stroke: var(--safe);
  opacity: 1;
  stroke-width: 3;
  stroke-dasharray: 8 6;
}
body[data-theme=underwater] #board .edge.scoring {
  stroke: var(--scoring);
  opacity: 1;
  stroke-width: 4;
  stroke-dasharray: 2 6;
}
body[data-theme=underwater] #board .occupied .edge {
  opacity: 0;
}
body[data-theme=underwater] #board .occupied .coral,
body[data-theme=underwater] #board .edge-group:not(.occupied):not([aria-disabled=true]):hover .coral {
  display: inline;
}
body[data-theme=underwater] #board .edge-group:not(.occupied):not([aria-disabled=true]):hover .edge {
  opacity: 0;
}
body[data-theme=underwater] #board .edge-group:not(.occupied):hover .coral {
  opacity: .55;
}
body[data-theme=underwater] .coral path {
  fill: none;
  stroke: var(--coral-color);
  stroke-linecap: round;
  stroke-linejoin: round;
}
body[data-theme=underwater] .coral-stem {
  stroke-width: 5.5;
}
body[data-theme=underwater] .coral-twigs {
  stroke-width: 3;
}
body[data-theme=underwater] .coral .coral-shine {
  stroke: #fff;
  stroke-width: 1;
  opacity: .4;
}
body[data-theme=underwater] #board .dot {
  fill: #bcefe7;
  stroke: #ebfff8;
  stroke-width: 1;
  filter: drop-shadow(0 0 3px #96eee36b);
}
body[data-theme=underwater] #board .shell-detail {
  display: inline;
  stroke: #498e9b;
  fill: none;
  stroke-width: .7;
}
body[data-theme=underwater] #board .box {
  stroke-width: 1;
  stroke-dasharray: 3 5;
}
body[data-theme=underwater] .sea-reward {
  display: inline;
  transform-box: fill-box;
  transform-origin: center;
}
body[data-theme=underwater] .sea-reward.revealed {
  animation: reef-discover .5s cubic-bezier(.2, .8, .3, 1.2);
}
body[data-theme=underwater] #board .box-label {
  transform: translateY(var(--reef-label-offset));
  font-size: var(--reef-label-size);
  letter-spacing: .06em;
}
body[data-theme=underwater] .legend {
  padding: 7px 12px;
  border-radius: 12px;
  background: #0b334bcc;
  display: table;
}
body[data-theme=underwater] .actions button {
  border-radius: 25px;
  box-shadow: 0 3px 0 #062b41;
}
body[data-theme=underwater] .actions .primary {
  background: #9ee9d8;
  color: #123e56;
  border-color: #9ee9d8;
}
body[data-theme=underwater] dialog {
  background: #123c54;
  border: 1px solid #71b4bd;
  border-radius: 25px;
}
body[data-theme=underwater] dialog::backdrop {
  background: #031b32ad;
}
body[data-theme=underwater] .room-banner {
  background: #174a60;
  border-radius: 22px;
}
@keyframes reef-swim {
  0%, 100% {
    transform: translate(0, 0) rotate(-3deg);
  }
  50% {
    transform: translate(-14px, 5px) rotate(4deg);
  }
}
@keyframes reef-bob {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(10px);
  }
}
@keyframes reef-bubble {
  from {
    transform: translateY(0);
    opacity: 0;
  }
  12% {
    opacity: .8;
  }
  85% {
    opacity: .6;
  }
  to {
    transform: translateY(-270px);
    opacity: 0;
  }
}
@keyframes reef-discover {
  from {
    opacity: 0;
    transform: scale(.5) rotate(-10deg);
  }
  to {
    opacity: 1;
    transform: scale(1) rotate(0);
  }
}
@media (max-width: 700px) {
  body[data-theme=underwater] .app-shell {
    padding: 0 16px 20px;
  }
  body[data-theme=underwater] .topbar {
    padding: 16px;
  }
  body[data-theme=underwater] .intro {
    padding: 24px;
    min-height: 290px;
    gap: 28px;
    align-items: flex-start;
  }
  body[data-theme=underwater] .intro > div:first-child {
    max-width: 78%;
  }
  body[data-theme=underwater] .sea-tip {
    max-width: 220px;
  }
  body[data-theme=underwater] .preferences {
    max-width: 100%;
    align-self: flex-start;
  }
  body[data-theme=underwater] .swimmer-0 {
    right: -3%;
    top: 100px;
    width: 95px;
    height: 95px;
  }
  body[data-theme=underwater] .swimmer-1 {
    right: 2%;
    top: 16px;
    width: 65px;
    height: 65px;
  }
  body[data-theme=underwater] .swimmer-2 {
    right: 23%;
    top: 133px;
    width: 58px;
    height: 58px;
  }
  body[data-theme=underwater] .swimmer-3 {
    right: 13%;
    top: 222px;
    width: 52px;
    height: 52px;
  }
  body[data-theme=underwater] .table {
    padding: 18px 14px 22px;
  }
  body[data-theme=underwater] .board-wrap {
    margin-top: 22px;
  }
  body[data-theme=underwater] .actions button {
    font-size: 12px;
  }
}
@media (max-width: 380px) {
  body[data-theme=underwater] .app-shell {
    padding: 0 12px 16px;
  }
  body[data-theme=underwater] .intro {
    padding: 22px 18px;
  }
  body[data-theme=underwater] .topbar {
    padding: 14px 12px;
  }
  body[data-theme=underwater] h1 {
    font-size: 28px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sea-swimmer,
  .sea-bubble,
  .sea-reward.revealed {
    animation: none !important;
  }
  .sea-bubble {
    bottom: calc(20px + var(--i)*21px);
    opacity: .35;
  }
}