.underwater-shell {
  position: fixed;
  z-index: 10000;
  inset: 0;
  display: grid;
  padding: 0;
  place-items: stretch;
  background: #173e43e8;
  backdrop-filter: blur(5px);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}
.underwater-shell[hidden] { display: none; }
.underwater-dialog {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 320px;
  overflow: hidden;
  isolation: isolate;
  color: #f8f4df;
  background: transparent;
}
.underwater-canvas { position: absolute; inset: 0; z-index: 0; display: block; width: 100%; height: 100%; pointer-events: none; }
.underwater-header {
  position: absolute;
  z-index: 2;
  top: max(22px, env(safe-area-inset-top));
  left: max(26px, env(safe-area-inset-left));
  right: max(26px, env(safe-area-inset-right));
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  pointer-events: none;
}
.underwater-header > * { pointer-events: auto; }
.underwater-eyebrow { color: #d2e8ca; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-shadow: 0 2px 8px #123d48a8; }
.underwater-header h2 { margin: 7px 0 0; color: #fff7dc; font-size: clamp(24px, 4vw, 38px); font-weight: 900; letter-spacing: .06em; text-shadow: 0 3px 12px #113f49a8; }
.underwater-close {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 10px;
  padding: 7px 13px 7px 17px;
  border: 1.5px solid #e5edc2b5;
  border-radius: 999px;
  background: #164d54c9;
  box-shadow: 0 4px 14px #0d333c55;
  color: #fff6df;
  cursor: pointer;
  font: 800 13px "Noto Sans TC", sans-serif;
}
.underwater-close span { display: grid; width: 26px; height: 26px; place-items: center; border-radius: 50%; background: #ec9e5b; color: #fff8e7; font-size: 20px; line-height: 1; }
.underwater-close:hover { background: #236a6c; }
.underwater-close:focus-visible, .underwater-feed:focus-visible { outline: 3px solid #ffda80; outline-offset: 3px; }
.underwater-readouts {
  position: absolute;
  z-index: 2;
  top: 104px;
  left: max(26px, env(safe-area-inset-left));
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  max-width: min(720px, calc(100% - 52px));
}
.underwater-chip {
  display: inline-flex;
  min-height: 35px;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid #e4ebc97a;
  border-radius: 999px;
  background: #174b53b5;
  box-shadow: 0 3px 12px #133b3d3d;
  color: #f5f2d9;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .03em;
  backdrop-filter: blur(5px);
}
.uw-dot { width: 8px; height: 8px; border-radius: 50%; background: #8dd0a0; box-shadow: 0 0 0 4px #8dd0a033; }
.uw-stage { background: #ffd179; box-shadow: 0 0 0 4px #ffd17933; }
.uw-quality { background: #71d5bd; box-shadow: 0 0 0 4px #71d5bd33; }
.is-poor-water .uw-quality { background: #e9a15f; box-shadow: 0 0 0 4px #e9a15f33; }
.underwater-warning {
  position: absolute;
  z-index: 2;
  top: 157px;
  left: max(26px, env(safe-area-inset-left));
  margin: 0;
  padding: 8px 13px;
  border: 1px solid #f3bb77a8;
  border-radius: 12px;
  background: #704a36c9;
  box-shadow: 0 4px 14px #183b3e55;
  color: #fff0ce;
  font-size: 12px;
  font-weight: 750;
}
.underwater-bottom {
  position: absolute;
  z-index: 2;
  right: max(28px, env(safe-area-inset-right));
  bottom: max(25px, env(safe-area-inset-bottom));
  left: max(28px, env(safe-area-inset-left));
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  pointer-events: none;
}
.underwater-bottom > * { pointer-events: auto; }
.underwater-bottom p { max-width: min(560px, 62vw); margin: 0; color: #f3f1d9; font-size: 14px; font-weight: 700; line-height: 1.65; text-shadow: 0 2px 9px #12373e; }
.underwater-feed {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  gap: 10px;
  padding: 8px 19px 8px 10px;
  border: 2px solid #f3d796;
  border-radius: 999px;
  background: #e79a50;
  box-shadow: 0 5px 0 #9c5e3d, 0 10px 22px #123b3f66;
  color: #fff9e8;
  cursor: pointer;
  font: 900 14px "Noto Sans TC", sans-serif;
  transition: transform .14s ease, filter .14s ease;
}
.underwater-feed:hover { transform: translateY(-2px); filter: brightness(1.06); }
.underwater-feed:active { transform: translateY(3px); box-shadow: 0 2px 0 #9c5e3d; }
.feed-mark { display: grid; width: 34px; height: 34px; place-items: center; border: 1px solid #fff3cb; border-radius: 50%; background: #ca7548; font-size: 23px; line-height: 1; }
@media (max-width: 600px) {
  .underwater-header { top: max(15px, env(safe-area-inset-top)); left: max(14px, env(safe-area-inset-left)); right: max(14px, env(safe-area-inset-right)); }
  .underwater-eyebrow { font-size: 10px; }
  .underwater-header h2 { margin-top: 4px; font-size: 23px; }
  .underwater-close { min-height: 38px; gap: 7px; padding: 5px 8px 5px 12px; font-size: 11px; }
  .underwater-close span { width: 24px; height: 24px; }
  .underwater-readouts { top: 91px; left: 14px; gap: 6px; max-width: calc(100% - 28px); }
  .underwater-chip { min-height: 30px; gap: 6px; padding: 5px 9px; font-size: 10px; }
  .underwater-warning { top: 132px; left: 14px; right: 14px; font-size: 10px; }
  .underwater-bottom { right: 14px; bottom: max(16px, env(safe-area-inset-bottom)); left: 14px; align-items: flex-end; gap: 9px; }
  .underwater-bottom p { max-width: calc(100% - 145px); font-size: 11px; }
  .underwater-feed { min-height: 46px; gap: 7px; padding: 6px 12px 6px 7px; font-size: 11px; }
  .feed-mark { width: 30px; height: 30px; font-size: 20px; }
}
@media (prefers-reduced-motion: reduce) { .underwater-feed { transition: none; } }
.underwater-shell{inset:84px 20px 104px auto;width:min(710px,calc(100vw - 40px));padding:0;background:#255b58;border:3px solid #d2dcb2;border-radius:24px;overflow:hidden;box-shadow:0 15px 40px #1b504144;backdrop-filter:none}.underwater-dialog{min-height:240px}.underwater-eyebrow,.underwater-bottom p{display:none}.underwater-header{top:18px;left:20px;right:18px}.underwater-header h2{font-size:21px;margin:0}.underwater-readouts{top:62px;left:20px;gap:6px}.underwater-chip{font-size:10px;min-height:28px;padding:5px 9px}.underwater-warning{top:100px;font-size:11px}.underwater-close{font-size:0;padding:3px;min-height:32px}.underwater-bottom{bottom:20px}.underwater-feed{font-size:12px}@media(max-width:620px){.underwater-shell{inset:155px 8px 115px;width:auto}.underwater-header h2{font-size:18px}.underwater-readouts{left:14px;max-width:calc(100% - 28px)}.underwater-chip{font-size:9px}.underwater-header{left:14px;right:12px}}
.underwater-scope{display:none;color:#f3f1d9;font-size:10px;font-weight:800;text-shadow:0 2px 8px #12373e}
@media(max-width:620px){.underwater-shell{inset:max(8px,env(safe-area-inset-top)) 8px max(8px,env(safe-area-inset-bottom));width:auto;max-height:none;border-radius:18px}.underwater-dialog{min-height:0}.underwater-header{top:12px;left:12px;right:10px}.underwater-readouts{top:56px;left:12px;right:12px;display:flex;flex-wrap:wrap}.underwater-chip{font-size:10px;min-height:32px}.underwater-warning{top:102px;left:12px;right:12px}.underwater-bottom{right:12px;bottom:12px;left:12px;align-items:flex-end;flex-wrap:wrap}.underwater-scope{display:block;order:3;width:100%;font-size:9px}.underwater-feed{min-height:44px}}
@media(orientation:landscape) and (max-height:520px){.underwater-shell{inset:6px 6px 6px auto;width:min(560px,68vw);border-radius:16px}.underwater-header{top:8px;left:12px;right:8px}.underwater-readouts{top:48px;left:12px}.underwater-warning{top:88px;left:12px;right:12px}.underwater-bottom{right:10px;bottom:8px;left:10px}.underwater-feed{min-height:38px}.underwater-scope{font-size:8px}}