:root{
  --ink:#eaf8ff;
  --dim:rgba(206,236,255,.52);
  --line:rgba(150,220,255,.14);
  --glass:rgba(9,29,43,.46);
  --accent:#82e6ff;
  --ease:cubic-bezier(.22,.68,.16,1);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{
  margin:0;height:100%;overflow:hidden;background:#02080f;color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
#stage{position:fixed;inset:0;background:#02080f}
canvas#scene{display:block;width:100%;height:100%;touch-action:none}

.layer{position:fixed;inset:0;pointer-events:none}
.tint{
  background:
    radial-gradient(58% 30% at 50% -6%,rgba(150,225,255,.085),rgba(120,200,255,.02) 55%,transparent 78%),
    linear-gradient(180deg,rgba(96,196,255,.05) 0%,rgba(60,150,220,.012) 26%,rgba(0,10,22,0) 55%,rgba(0,8,18,.16) 100%);
}
.vignette{
  background:radial-gradient(125% 95% at 50% 44%,rgba(0,0,0,0) 40%,rgba(0,9,18,.14) 70%,rgba(0,6,14,.46) 100%);
}
.grain{
  inset:-20%;
  opacity:.055;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/></filter><rect width='160' height='160' filter='url(%23n)'/></svg>");
  animation:grainShift 8s steps(6) infinite;
}
@keyframes grainShift{
  0%{transform:translate3d(0,0,0)} 20%{transform:translate3d(-2%,1%,0)}
  40%{transform:translate3d(1.5%,-1.5%,0)} 60%{transform:translate3d(-1%,-2%,0)}
  80%{transform:translate3d(2%,1.5%,0)} 100%{transform:translate3d(0,0,0)}
}
.glass-edge{
  background:
    radial-gradient(140% 70% at 50% -10%,rgba(120,220,255,.10),transparent 55%),
    inset 0 0 0 1px rgba(140,215,255,.05);
  box-shadow:inset 0 0 120px rgba(0,11,24,.55);
}

/* ---------- top hud ---------- */
.hud{
  position:fixed;left:0;right:0;z-index:20;
  transition:opacity .8s var(--ease),transform .8s var(--ease),filter .8s var(--ease);
}
.hud.top{
  top:0;display:flex;align-items:flex-start;justify-content:space-between;
  padding:26px 30px;pointer-events:none;
}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{
  width:38px;height:38px;border-radius:12px;display:grid;place-items:center;
  color:#a9edff;
  background:linear-gradient(160deg,rgba(38,102,136,.55),rgba(8,26,40,.35));
  border:1px solid rgba(140,220,255,.18);
  box-shadow:0 6px 24px rgba(0,20,40,.45),inset 0 1px 0 rgba(190,240,255,.14);
  backdrop-filter:blur(12px) saturate(130%);
  -webkit-backdrop-filter:blur(12px) saturate(130%);
}
.brand-mark svg{width:24px;height:24px}
.brand-text h1{
  margin:0;font-size:15px;font-weight:600;letter-spacing:.16em;
  text-shadow:0 2px 18px rgba(0,30,60,.7);
}
.brand-text p{
  margin:5px 0 0;font-size:9px;letter-spacing:.34em;color:var(--dim);font-weight:500;
}
.meta{
  display:flex;align-items:center;gap:6px;font-size:10px;letter-spacing:.14em;
  color:var(--dim);padding:8px 12px;border-radius:999px;
  background:rgba(6,22,34,.34);border:1px solid rgba(140,215,255,.10);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  font-variant-numeric:tabular-nums;
}
.meta .dot{
  width:5px;height:5px;border-radius:50%;background:#5ce1a8;
  box-shadow:0 0 8px rgba(92,225,168,.9);animation:pulse 2.6s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.meta .unit{opacity:.6}

/* ---------- hint ---------- */
.hint{
  position:fixed;left:50%;top:96px;transform:translateX(-50%);
  display:flex;align-items:center;gap:14px;
  font-size:11.5px;letter-spacing:.08em;color:rgba(210,240,255,.5);
  padding:9px 18px;border-radius:999px;
  background:rgba(4,17,27,.30);border:1px solid rgba(140,215,255,.07);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  transition:opacity 1s var(--ease),transform 1s var(--ease);
  pointer-events:none;white-space:nowrap;z-index:15;
  animation:hintFade 1.6s 1.2s both;
}
@keyframes hintFade{from{opacity:0;transform:translate(-50%,-8px)}to{opacity:1;transform:translate(-50%,0)}}
.hint i{width:1px;height:11px;background:rgba(150,220,255,.22)}

/* ---------- dock ---------- */
.dock{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%);
  display:flex;gap:4px;padding:7px;border-radius:22px;z-index:20;
  background:linear-gradient(180deg,rgba(14,40,58,.58),rgba(5,18,29,.62));
  border:1px solid rgba(150,220,255,.13);
  box-shadow:0 20px 60px rgba(0,10,22,.6),0 2px 10px rgba(0,8,18,.4),inset 0 1px 0 rgba(200,245,255,.10);
  backdrop-filter:blur(22px) saturate(150%);
  -webkit-backdrop-filter:blur(22px) saturate(150%);
  transition:opacity .8s var(--ease),transform .8s var(--ease),filter .8s var(--ease);
}
.dock::before{
  content:"";position:absolute;left:14%;right:14%;top:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(190,240,255,.35),transparent);
}
.dock button{
  position:relative;display:flex;align-items:center;gap:8px;
  white-space:nowrap;flex:0 0 auto;
  padding:10px 15px 10px 13px;border-radius:16px;border:0;cursor:pointer;
  background:transparent;color:rgba(224,245,255,.82);
  font-family:inherit;font-size:12px;font-weight:500;letter-spacing:.08em;
  transition:background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
}
.dock button svg{width:18px;height:18px;flex:none;opacity:.9;transition:transform .4s var(--ease)}
.dock button kbd{
  font-family:inherit;font-size:9px;letter-spacing:.06em;font-weight:500;
  padding:2px 5px;border-radius:5px;color:rgba(180,225,255,.42);
  background:rgba(120,200,255,.07);border:1px solid rgba(140,215,255,.10);
}
.dock button:hover{background:rgba(120,215,255,.10);color:#f2fbff;transform:translateY(-1px)}
.dock button:hover svg{transform:scale(1.08)}
.dock button:hover kbd{color:rgba(200,240,255,.75)}
.dock button:active{transform:translateY(0) scale(.985)}
.dock button.on{background:rgba(120,225,255,.13);color:#bdf2ff;box-shadow:inset 0 0 0 1px rgba(140,225,255,.18)}
.dock button.on svg{filter:drop-shadow(0 0 6px rgba(130,230,255,.7))}
.dock button .mute{display:none}
.dock button.muted .wave{display:none}
.dock button.muted .mute{display:block}
.dock button.muted{color:rgba(200,225,240,.5)}

.dock-hint{
  position:fixed;left:50%;bottom:12px;transform:translateX(-50%);
  font-size:9.5px;letter-spacing:.22em;color:rgba(180,220,245,.26);
  z-index:19;white-space:nowrap;transition:opacity .8s var(--ease);
  pointer-events:none;
}

/* ---------- immersive ---------- */
body.immersive .hud,
body.immersive .dock,
body.immersive .dock-hint,
body.immersive .hint{opacity:0;transform:translate(-50%,14px);filter:blur(3px);pointer-events:none}
body.immersive .hud.top{transform:translateY(-12px)}
body.immersive{cursor:none}

/* ---------- fx ---------- */
.fx{position:fixed;inset:0;pointer-events:none;z-index:18;overflow:hidden}
.ripple{
  position:absolute;border-radius:50%;border:1px solid rgba(160,235,255,.55);
  transform:translate(-50%,-50%) scale(.2);opacity:.9;
  animation:ripple .9s cubic-bezier(.16,.7,.3,1) forwards;
  pointer-events:none;
}
@keyframes ripple{
  0%{transform:translate(-50%,-50%) scale(.2);opacity:.85;border-width:1.5px}
  100%{transform:translate(-50%,-50%) scale(23);opacity:0;border-width:.3px}
}
.floaty{
  position:absolute;transform:translate(-50%,-50%);
  font-size:12px;letter-spacing:.14em;color:#cfeeff;white-space:nowrap;
  text-shadow:0 2px 12px rgba(0,40,70,.9);
  animation:floaty 1.5s cubic-bezier(.2,.7,.25,1) forwards;
}
@keyframes floaty{
  0%{opacity:0;transform:translate(-50%,-50%) scale(.7)}
  25%{opacity:1;transform:translate(-50%,-60%) scale(1)}
  100%{opacity:0;transform:translate(-50%,-190%) scale(.96)}
}
.spark{
  position:absolute;width:4px;height:4px;border-radius:50%;
  background:radial-gradient(circle,#eafcff,rgba(120,225,255,0));
  animation:sparkOut .7s ease-out forwards;pointer-events:none;
}
@keyframes sparkOut{
  0%{opacity:.95;transform:translate(-50%,-50%) scale(1)}
  100%{opacity:0;transform:translate(calc(-50% + var(--dx)),calc(-50% + var(--dy))) scale(.2)}
}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:104px;z-index:40;
  transform:translate(-50%,12px);opacity:0;pointer-events:none;
  padding:11px 20px;border-radius:14px;max-width:76vw;
  background:rgba(9,29,43,.72);border:1px solid rgba(150,220,255,.16);
  box-shadow:0 14px 44px rgba(0,10,22,.55),inset 0 1px 0 rgba(200,245,255,.10);
  backdrop-filter:blur(18px) saturate(140%);-webkit-backdrop-filter:blur(18px) saturate(140%);
  font-size:12px;letter-spacing:.06em;line-height:1.7;color:#e6f7ff;text-align:center;
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- loader ---------- */
.loader{
  position:fixed;inset:0;z-index:60;display:grid;place-content:center;justify-items:center;gap:22px;
  background:radial-gradient(70% 60% at 50% 40%,#062033,#010910 75%);
  transition:opacity 1.1s var(--ease),visibility 1.1s;
}
.loader.done{opacity:0;visibility:hidden}
.loader-tank{display:flex;align-items:flex-end;gap:7px;height:46px}
.loader-tank span{
  display:block;width:7px;border-radius:99px;
  background:linear-gradient(180deg,rgba(160,240,255,.9),rgba(60,160,220,.35));
  animation:fill 1.5s var(--ease) infinite;
  box-shadow:0 0 16px rgba(120,230,255,.35);
}
.loader-tank span:nth-child(2){animation-delay:.18s}
.loader-tank span:nth-child(3){animation-delay:.36s}
@keyframes fill{
  0%{height:8px;opacity:.35}
  45%{height:38px;opacity:1}
  100%{height:8px;opacity:.35}
}
.loader p{
  margin:0;font-size:10px;letter-spacing:.42em;color:rgba(190,232,255,.5);
  text-transform:uppercase;padding-left:.42em;
}

@media (max-width:1100px){
  .dock button kbd{display:none}
  .dock button{padding:10px 13px}
}
@media (max-width:760px){
  .hud.top{padding:16px 18px}
  .brand-text h1{font-size:13px}
  .brand-text p{font-size:8px;letter-spacing:.28em}
  .brand-mark{width:32px;height:32px;border-radius:10px}
  .meta{display:none}
  .hint{display:none}
  .dock{bottom:22px;gap:0;padding:6px;border-radius:20px;max-width:calc(100vw - 24px)}
  .dock button{padding:11px 12px;gap:6px;border-radius:15px;font-size:11px;letter-spacing:.04em}
  .dock button kbd{display:none}
  .dock button svg{width:17px;height:17px}
  .dock-hint{font-size:8.5px;letter-spacing:.16em;bottom:8px}
}
@media (max-width:430px){
  .dock button span{display:none}
  .dock button{padding:12px}
}

/* The two photographs share one crop, preserving scene registration at dusk. */
.reef-photo{position:absolute;inset:0;background-size:cover;background-position:center;pointer-events:none}
.reef-day{background-image:url('../assets/backgrounds/reef-diffuse-day.png')}
.reef-night{background-image:url('../assets/backgrounds/reef-diffuse-day.png');filter:brightness(.2) sepia(.2) hue-rotate(160deg);opacity:0}
canvas#scene{position:relative}
.tint,.grain{display:none}
.vignette{opacity:.28}
.glass-edge{box-shadow:inset 0 0 70px rgba(0,11,24,.16)}
.hint{color:#eefaff;background:rgba(3,19,30,.65)}
.dock button:focus-visible{outline:2px solid #d0f5ff;outline-offset:3px;background:rgba(100,200,230,.24)}
.dock button{min-width:44px;min-height:44px}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}

body.immersive .hint{animation:none}

.meta .dot{animation:none;box-shadow:none}
.meta,.dock-hint,.loader p{font-size:11px}
.dock-hint{color:rgba(230,248,255,.8);text-shadow:0 1px 4px #000}

.dock button output{font:500 11px ui-monospace,monospace;color:#cff3f4;letter-spacing:0;min-width:24px}
.speed-panel{position:absolute;right:0;bottom:calc(100% + 12px);width:280px;box-sizing:border-box;padding:18px;border:1px solid rgba(150,220,255,.22);border-radius:18px;background:rgba(6,28,39,.96);box-shadow:0 12px 36px #0006;color:#e6f6f8;backdrop-filter:blur(18px)}
.speed-panel[hidden]{display:none}
.speed-heading,.speed-footer{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px}
.speed-heading output{font-variant-numeric:tabular-nums;color:#aee5e5}
.speed-panel input{display:block;width:100%;height:32px;margin:10px 0 4px;accent-color:#a9dcd8;cursor:pointer}
.speed-panel input:focus-visible{outline:2px solid #c1f0eb;outline-offset:3px;border-radius:8px}
.speed-footer{font-size:10px;color:#a8c3ca}
.dock .speed-footer button{font-size:10px;padding:4px 7px;min-width:0;min-height:32px;letter-spacing:0;background:#a9dcd812}
@media(max-width:430px){.dock>[data-act="speed"]{flex-direction:column;gap:2px;padding:6px 9px}.dock>[data-act="speed"] output{font-size:9px}.speed-panel{width:270px;right:0}}
@media(max-width:360px){.dock>button{min-width:40px;padding-left:10px;padding-right:10px}}


/* ---------- saved fish species ---------- */
.fish-library-panel{position:absolute;left:50%;bottom:calc(100% + 12px);transform:translateX(-50%);width:400px;max-width:calc(100vw - 24px);max-height:min(560px,70dvh);box-sizing:border-box;display:flex;flex-direction:column;padding:16px 18px 18px;border:1px solid rgba(150,220,255,.22);border-radius:18px;background:rgba(6,28,39,.97);box-shadow:0 12px 36px #0006;color:#e6f6f8;backdrop-filter:blur(18px)}
.fish-library-panel[hidden]{display:none}
.fish-library-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;flex:none}
.fish-library-heading h2{margin:0;font-size:14px;font-weight:600;letter-spacing:.06em}
.dock .fish-library-panel button{display:flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;gap:6px;font-size:13px;letter-spacing:0;border-radius:12px}
.dock .fish-library-panel button span{display:inline}
.dock .fish-library-panel button:disabled{cursor:default;opacity:.35;transform:none}
.dock .fish-library-panel button:disabled:hover{background:transparent}
#fishLibraryStatus{flex:none;margin:0 0 12px;color:#a8c3ca;font-size:11px;line-height:1.6;overflow-wrap:anywhere}
.fish-library-list{overflow-y:auto;overscroll-behavior:contain;min-height:0;scrollbar-width:thin;scrollbar-color:#628c9966 transparent}
.fish-species-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 0;border-top:1px solid rgba(150,220,255,.1)}
.fish-species-info{min-width:0;flex:1}
.fish-species-info strong,.fish-species-info small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.fish-species-info strong{font-size:12px;font-weight:500;line-height:1.6}
.fish-species-info small{margin-top:2px;font-size:10px;color:#94b3bd;line-height:1.6}
.fish-count-controls{display:flex;align-items:center;gap:2px;flex:none}
.dock .fish-count-controls button{width:44px;height:44px;font-size:21px;line-height:1;background:rgba(169,220,216,.07)}
.fish-count-controls output{min-width:24px;text-align:center;font-size:13px;font-variant-numeric:tabular-nums;color:#d4eff1}
.fish-library-footer{flex:none;display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:14px;margin-top:4px;border-top:1px solid rgba(150,220,255,.14)}
.dock #fishLibraryUpload{background:rgba(169,220,216,.12);padding:10px 12px;font-size:12px}
.fish-library-footer small{color:#94b3bd;font-size:10px;line-height:1.5;text-align:right}
@media(max-width:430px){.fish-library-panel{padding:12px;max-height:70dvh}.fish-library-footer{gap:8px}.fish-library-footer small{font-size:9px}.fish-species-row{gap:6px}.fish-count-controls{gap:0}}

.dock .fish-species-info .fish-orientation{min-width:0;min-height:32px;max-width:100%;padding:4px 7px;margin-top:5px;font-size:10px;color:#b9e5e3;background:rgba(169,220,216,.08);white-space:normal;text-align:left}
.dock .fish-species-info .fish-orientation[aria-pressed="true"]{background:rgba(169,220,216,.17);color:#dcf7f3}

canvas#scene{touch-action:none}