/* Open Water — full-bleed WebGL ocean, back button + title top-left, glass control panel bottom-right
   (a sheet on phones). Single dark look by choice. See reference/open-water-page.md. */
:root{
  color-scheme: dark;
  --bg:#041218;
  --panel:rgba(4,20,27,.70);
  --line:rgba(160,212,224,.18);
  --text:#d9e9ed;
  --mute:#8aa6b0;
  --accent:#e8b46c;
  --accent-ink:#2a1b05;
  --f-display:'Bricolage Grotesque',system-ui,-apple-system,'Segoe UI',sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,monospace;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;overflow:hidden}
body{background:var(--bg);color:var(--text);font:13px/1.45 var(--f-display);-webkit-font-smoothing:antialiased}
#gl{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab}
#gl:focus{outline:none}
#gl.drag{cursor:grabbing}

/* back to Experiments */
.back{position:fixed;left:16px;top:calc(env(safe-area-inset-top,0px) + 16px);width:40px;height:40px;display:grid;place-items:center;border-radius:50%;color:var(--text);background:var(--panel);border:1px solid var(--line);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);text-decoration:none;z-index:3}
.back:hover{border-color:rgba(232,180,108,.6)}
.back:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.back svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

.brand{position:fixed;left:68px;top:calc(env(safe-area-inset-top,0px) + 16px);max-width:min(340px,calc(100vw - 320px));pointer-events:none;text-shadow:0 1px 14px rgba(0,10,16,.55)}
.brand h1{margin:0;font-size:26px;line-height:1.05;font-weight:700;letter-spacing:-.01em;text-wrap:balance}
.brand p{margin:6px 0 0;color:#e6f1f3;opacity:.82;font-size:12.5px;text-wrap:balance}

.topbar{position:fixed;right:16px;top:calc(env(safe-area-inset-top,0px) + 16px);display:flex;gap:8px}
.toggle{font:600 12px var(--f-display);letter-spacing:.06em;text-transform:uppercase;color:var(--text);background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:8px 14px;cursor:pointer;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.toggle:hover{border-color:rgba(232,180,108,.6)}
.toggle.on{border-color:var(--accent);color:var(--accent)}
.note{margin:12px 0 0;font-size:11px;line-height:1.45;color:var(--mute)}
input[type=range]:disabled{opacity:.35;cursor:not-allowed}

.panel{position:fixed;right:16px;bottom:calc(env(safe-area-inset-bottom,0px) + 16px);width:min(330px,calc(100vw - 32px));max-height:calc(100% - 110px);overflow-y:auto;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px 16px;backdrop-filter:blur(14px) saturate(1.2);-webkit-backdrop-filter:blur(14px) saturate(1.2)}
.read{display:flex;flex-wrap:wrap;gap:4px 14px;font:500 11.5px var(--f-mono);color:var(--mute);padding-bottom:12px;margin-bottom:12px;border-bottom:1px solid var(--line)}
.read b{color:var(--text);font-weight:500}

.ctl{display:grid;grid-template-columns:1fr auto;gap:2px 10px;align-items:baseline;margin-bottom:11px}
.ctl label{font-size:12px;color:var(--text)}
.ctl output{font:500 11.5px var(--f-mono);color:var(--accent);font-variant-numeric:tabular-nums}
.ctl input{grid-column:1/-1;margin:0}

input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:20px;background:transparent;cursor:pointer}
input[type=range]::-webkit-slider-runnable-track{height:2px;background:rgba(160,212,224,.3);border-radius:2px}
input[type=range]::-moz-range-track{height:2px;background:rgba(160,212,224,.3);border-radius:2px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);border:0;margin-top:-6px}
input[type=range]::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:var(--accent);border:0}
input[type=range]:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

.chips{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-top:12px}
.chips span{font:500 10.5px var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--mute);min-width:64px}
.chip{font:600 12px var(--f-display);color:var(--text);background:transparent;border:1px solid var(--line);border-radius:999px;padding:5px 12px;cursor:pointer}
.chip:hover{border-color:rgba(232,180,108,.6)}
.chip:focus-visible,.toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.chip.on{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.chip:disabled{opacity:.4;cursor:not-allowed}

#diag{position:fixed;left:16px;right:16px;bottom:16px;max-height:40%;overflow:auto;margin:0;padding:12px;background:rgba(40,8,8,.92);color:#ffd9d2;font:11px/1.4 var(--f-mono);border:1px solid #a33;border-radius:8px;white-space:pre-wrap;z-index:5}
/* required: #fail{display:grid} would otherwise override the hidden attribute */
[hidden]{display:none!important}
#fail{position:fixed;inset:0;display:grid;place-content:center;padding:24px;text-align:center;background:var(--bg);color:var(--text);font-size:15px}

@media (max-width:640px){
  .panel{left:16px;right:16px;width:auto;max-height:55%}
  .brand h1{font-size:22px}
  .brand{left:16px;top:calc(env(safe-area-inset-top,0px) + 66px);max-width:calc(100vw - 32px)}
}