:root{--deep: #04263b;--glass: rgba(6, 40, 60, .55);--foam: #dff3f7;--accent: #ffb35c;--hud-gap: 14px}*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;background:var(--deep)}#tank{position:fixed;top:0;right:0;bottom:0;left:0;width:100%;height:100%;display:block;touch-action:none;outline:none}#about-oceatics{position:fixed;top:0;right:0;bottom:0;left:0;z-index:-1;overflow:hidden;padding:24px;color:#9db8c4;font:14px/1.5 system-ui,sans-serif}#hud{position:fixed;right:calc(var(--hud-gap) + env(safe-area-inset-right,0px));bottom:calc(var(--hud-gap) + env(safe-area-inset-bottom,0px));display:flex;gap:10px;z-index:10;transition:opacity .6s ease}body.idle #hud{opacity:0;pointer-events:none}body.idle #tank{cursor:none}.hud-btn{width:46px;height:46px;display:grid;place-items:center;padding:0;border:1px solid rgba(190,230,240,.22);border-radius:13px;background:var(--glass);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--foam);cursor:pointer;transition:transform .15s ease,background .2s ease,color .2s ease}.hud-btn svg{width:22px;height:22px}.hud-btn:hover{transform:translateY(-2px);background:#0e3e58b8}.hud-btn:active{transform:translateY(0)}.hud-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.hud-btn.off{color:#dff3f773}.hud-btn.cooling{color:#dff3f759;pointer-events:none}#help-overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:#02121c8c;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);opacity:0;pointer-events:none;transition:opacity .3s ease;z-index:30}#help-overlay.visible{opacity:1;pointer-events:auto}.help-card{max-width:min(420px,88vw);padding:26px 30px;background:#06283ceb;border:1px solid rgba(190,230,240,.25);border-radius:18px;color:var(--foam);font-family:ui-rounded,SF Pro Rounded,system-ui,sans-serif}.oceatics-brand{text-align:center;margin-bottom:18px}.oceatics-title{margin:0;font-size:34px;font-weight:800;letter-spacing:.34em;padding-left:.34em;background:linear-gradient(180deg,#cdf1fa,#5db8d4 55%,#2a7fa3);-webkit-background-clip:text;background-clip:text;color:transparent}.oceatics-tag{margin:6px 0 0;font-size:12.5px;letter-spacing:.12em;text-transform:lowercase;opacity:.7}.oceatics-credits{margin-top:18px;padding-top:14px;border-top:1px solid rgba(190,230,240,.16);font-size:12px;line-height:1.5;opacity:.65;text-align:center}.oceatics-credits p{margin:0 0 4px}.oceatics-copy{letter-spacing:.08em}.help-card ul{margin:0;padding-left:18px;display:grid;gap:8px;font-size:14.5px;line-height:1.45}.help-card kbd{padding:1px 6px;border:1px solid rgba(190,230,240,.35);border-radius:5px;font-size:12px;background:#ffffff0f}.help-hint{margin:14px 0 0;font-size:13px;opacity:.72;font-style:italic;text-align:center}.oceatics-tip{display:block;width:fit-content;margin:16px auto 0;padding:8px 22px;border:1px solid rgba(190,230,240,.35);border-radius:999px;color:var(--foam);text-decoration:none;font-size:13.5px;font-weight:600;letter-spacing:.04em;background:#3282a040;transition:background .2s ease,transform .15s ease}.oceatics-tip:hover{background:#46a5c866;transform:translateY(-1px)}#infocard{position:fixed;left:50%;bottom:calc(26px + env(safe-area-inset-bottom,0px));transform:translate(-50%) translateY(12px);max-width:min(440px,86vw);padding:12px 20px;background:var(--glass);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid rgba(190,230,240,.18);border-radius:14px;color:var(--foam);text-align:center;opacity:0;pointer-events:none;transition:opacity .45s ease,transform .45s ease;z-index:15;font-family:ui-rounded,SF Pro Rounded,system-ui,sans-serif}#infocard.visible{opacity:1;transform:translate(-50%) translateY(0)}.infocard-name{font-size:17px;font-weight:700;letter-spacing:.02em}.infocard-fact{margin-top:4px;font-size:13.5px;line-height:1.45;opacity:.85}.tap-ripple{position:fixed;width:14px;height:14px;margin:-7px 0 0 -7px;border:2px solid rgba(220,245,255,.85);border-radius:50%;pointer-events:none;z-index:14;animation:ripple .7s ease-out forwards}@keyframes ripple{to{transform:scale(5.5);opacity:0}}#debug{position:fixed;left:calc(10px + env(safe-area-inset-left,0px));top:calc(10px + env(safe-area-inset-top,0px));color:var(--foam);font:12px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--glass);padding:6px 10px;border-radius:8px;pointer-events:none;z-index:20;white-space:pre}