:root{
  color-scheme:dark;
  --bg:#05070a;
  --panel:#10141a;
  --panel-2:#171c24;
  --line:#2b3440;
  --text:#f8fbff;
  --muted:#91a0af;
  --accent:#54e9ff;
  --good:#66f29b;
  --warn:#ffd55b;
  --bad:#ff6868;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:#030406;color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
body{overflow-x:hidden}
button{font:inherit;color:inherit}
.app-shell{min-height:100vh;background:radial-gradient(circle at 50% -20%,#1a2735 0,#090c11 42%,#020304 100%)}
.app-header{height:72px;display:grid;grid-template-columns:260px 1fr 260px;align-items:center;padding:0 20px;border-bottom:1px solid #252b33;background:rgba(7,9,12,.96);position:sticky;top:0;z-index:20;backdrop-filter:blur(14px)}
.brand{display:flex;gap:12px;align-items:center;background:transparent;border:0;padding:0;text-align:left;cursor:pointer}
.brand strong{display:block;font-size:18px;letter-spacing:.16em}.brand small{display:block;font-size:9px;letter-spacing:.25em;color:#7d8a98;margin-top:2px}
.brand-ping{width:36px;height:36px;border-radius:50%;border:2px solid #51e5ff;position:relative;box-shadow:0 0 24px rgba(81,229,255,.23)}
.brand-ping:before,.brand-ping:after{content:"";position:absolute;border:2px solid #51e5ff;border-left-color:transparent;border-bottom-color:transparent;border-radius:50%;transform:rotate(45deg)}
.brand-ping:before{inset:6px}.brand-ping:after{inset:12px;background:#51e5ff;border:0}
.mode-tabs{display:flex;justify-content:center;gap:6px}.mode-tab{border:1px solid #2a333e;background:#0e1218;padding:10px 18px;border-radius:7px;color:#8896a5;font-size:11px;font-weight:800;letter-spacing:.12em;cursor:pointer}.mode-tab:hover{border-color:#465361;color:#d5e0ea}.mode-tab.active{background:#15232d;border-color:#2f8fa1;color:#7fecff;box-shadow:inset 0 -2px #5ae9ff}
.player-strip{display:flex;justify-content:flex-end;gap:18px;font-size:10px;color:#748392;letter-spacing:.08em}.player-strip span{display:grid;gap:2px}.player-strip b{font-size:14px;color:#fff}
.display-frame{padding:18px;display:flex;justify-content:center}
.sonar-bezel{width:min(1500px,100%);padding:10px;border-radius:16px;background:linear-gradient(#252b32,#0e1116);box-shadow:0 26px 80px rgba(0,0,0,.55),inset 0 1px rgba(255,255,255,.08);border:1px solid #30363f}
.screen-wrap{position:relative;aspect-ratio:16/9;max-height:calc(100vh - 165px);min-height:480px;background:#1805c7;overflow:hidden;border-radius:9px;border:2px solid #090b0e;box-shadow:inset 0 0 0 1px rgba(255,255,255,.05);touch-action:manipulation;cursor:crosshair}
#sonarCanvas{position:absolute;inset:0;width:100%;height:100%;display:block;image-rendering:auto}
.ascope-panel{position:absolute;right:0;top:0;bottom:0;width:46px;z-index:7;pointer-events:none;border-left:1px solid rgba(255,255,255,.18);border-right:1px solid rgba(255,255,255,.08);background:linear-gradient(180deg,rgb(13,20,74),rgb(10,13,42));box-shadow:inset 0 0 0 1px rgba(0,0,0,.18)}
#ascopeCanvas{position:absolute;inset:0;width:100%;height:100%;display:block;opacity:1}
.ascope-label{position:absolute;top:8px;left:50%;transform:translateX(-50%);font-size:8px;font-weight:900;letter-spacing:.14em;color:rgba(233,246,255,.82);text-shadow:0 1px 2px rgba(0,0,0,.75);white-space:nowrap}

.telemetry{position:absolute;top:8px;left:12px;z-index:5;text-shadow:0 2px 3px rgba(0,0,0,.7);font-weight:800;line-height:.95;pointer-events:none}.telemetry>div,.depth-readout{display:flex;align-items:flex-end;gap:4px}.depth-readout{pointer-events:auto;border:0;background:transparent;padding:0;margin:0 0 4px;color:#fff;cursor:pointer}.depth-readout span{font-size:clamp(56px,7vw,112px);font-weight:900;letter-spacing:-.07em}.depth-readout small{font-size:clamp(22px,2.3vw,40px);font-weight:900;margin-bottom:.12em}.telemetry>div span{font-size:clamp(16px,1.8vw,28px)}.telemetry>div small{font-size:clamp(10px,1vw,15px);margin:0 0 1px 3px;color:#e7eff8}
.depth-scale{position:absolute;right:48px;top:0;bottom:0;width:58px;z-index:8;pointer-events:none;text-shadow:0 2px 4px #000}.depth-scale .tick{position:absolute;right:0;transform:translateY(-50%);font-size:clamp(13px,1.35vw,22px);font-weight:900;display:flex;align-items:center;gap:7px}.depth-scale .tick:before{content:"";width:10px;border-top:2px solid rgba(255,255,255,.72)}
.screen-status{position:absolute;z-index:5;display:flex;gap:7px;align-items:center;background:rgba(0,0,0,.45);border:1px solid rgba(255,255,255,.17);border-radius:5px;padding:6px 9px;font-size:10px;font-weight:900;letter-spacing:.11em;box-shadow:0 3px 12px rgba(0,0,0,.25)}.top-center{top:8px;left:50%;transform:translateX(-50%)}.status-dot{width:7px;height:7px;background:#58ee8c;border-radius:50%;box-shadow:0 0 8px #58ee8c}
.frequency-badge,.range-badge,.compass-badge{position:absolute;z-index:5;background:rgba(4,5,8,.62);border:1px solid rgba(255,255,255,.16);border-radius:4px;text-shadow:0 1px 2px #000}.frequency-badge{left:10px;bottom:72px;padding:6px 8px;font-size:12px}.range-badge{right:10px;top:46px;padding:6px 8px;display:grid;font-size:9px;color:#b7c3ce;letter-spacing:.08em}.range-badge b{color:#fff;font-size:12px;letter-spacing:0}.compass-badge{right:10px;top:96px;padding:6px 8px;display:grid;gap:2px;min-width:106px;font-size:9px;color:#b7c3ce;letter-spacing:.08em}.compass-badge b{color:#fff;font-size:12px;letter-spacing:0}.compass-strip{font-style:normal;font-size:8px;color:#91a2b3;letter-spacing:.05em;white-space:nowrap;overflow:hidden;text-overflow:clip}
.mini-compass{position:absolute;right:10px;bottom:122px;width:96px;height:96px;z-index:6;border-radius:50%;background:radial-gradient(circle at 35% 30%, rgba(255,255,255,.12), rgba(16,20,32,.96) 58%, rgba(4,7,14,.98) 100%);border:1px solid rgba(255,255,255,.18);box-shadow:0 8px 24px rgba(0,0,0,.34), inset 0 0 0 1px rgba(255,255,255,.06)}
.mini-compass-ring{position:absolute;inset:8px;border-radius:50%;border:1px solid rgba(255,255,255,.24)}
.mini-compass-ring:before,.mini-compass-ring:after{content:'';position:absolute;background:rgba(255,255,255,.16)}
.mini-compass-ring:before{left:50%;top:6px;bottom:6px;width:1px;transform:translateX(-50%)}
.mini-compass-ring:after{top:50%;left:6px;right:6px;height:1px;transform:translateY(-50%)}
.mini-compass-arrow{--heading:0deg;position:absolute;inset:10px;border-radius:50%;transform:rotate(var(--heading));transform-origin:50% 50%;transition:transform .12s linear;filter:drop-shadow(0 1px 2px rgba(0,0,0,.65))}
.mini-compass-arrow:before{content:'';position:absolute;left:50%;top:5px;width:4px;height:34px;transform:translateX(-50%);border-radius:3px 3px 1px 1px;background:#f5f7fb}
.mini-compass-arrow:after{content:'';position:absolute;left:50%;top:38px;width:10px;height:10px;transform:translate(-50%,-50%);border-radius:50%;background:#dce5ef;border:2px solid rgba(10,14,22,.9);box-shadow:0 0 0 1px rgba(255,255,255,.2)}
.mini-compass-label{position:absolute;left:50%;bottom:11px;transform:translateX(-50%);font-size:10px;font-weight:900;color:#edf4fc;letter-spacing:.03em;text-shadow:0 1px 2px rgba(0,0,0,.7);white-space:nowrap}
.mini-compass-mark{position:absolute;font-size:9px;font-weight:900;color:#bcc9d8;text-shadow:0 1px 2px rgba(0,0,0,.8)}
.mini-compass-mark.n{left:50%;top:4px;transform:translateX(-50%)}
.mini-compass-mark.e{right:7px;top:50%;transform:translateY(-50%)}
.mini-compass-mark.s{left:50%;bottom:4px;transform:translateX(-50%)}
.mini-compass-mark.w{left:7px;top:50%;transform:translateY(-50%)}
.sonar-bottom-controls{position:absolute;left:50%;bottom:8px;transform:translateX(-50%);z-index:8;display:flex;align-items:end;gap:10px}.control-cluster{display:grid;grid-template-columns:auto auto auto;grid-template-areas:"name name name" "minus value plus";gap:2px;background:rgba(14,17,22,.88);border:1px solid rgba(255,255,255,.23);border-radius:6px;padding:4px;box-shadow:0 5px 18px rgba(0,0,0,.3)}.control-name{grid-area:name;text-align:center;font-size:8px;font-weight:900;letter-spacing:.1em;color:#a9b6c2}.control-cluster button,.pause-control{min-width:40px;height:34px;border:1px solid #3d4651;background:linear-gradient(#343a44,#15191f);border-radius:3px;cursor:pointer;font-size:21px;font-weight:800}.control-cluster button:hover,.pause-control:hover{background:linear-gradient(#444d5a,#1e242c)}.control-cluster strong{display:flex;min-width:55px;justify-content:center;align-items:center;font-size:12px}.range-controls{grid-template-columns:auto auto auto}.range-controls button:nth-of-type(1){grid-area:minus}.range-controls .auto{grid-area:value;font-size:10px}.range-controls button:nth-of-type(3){grid-area:plus}.range-controls .auto.active{color:#60f2ff;border-color:#3aa8b7;background:#132930}.control-cluster .wide{grid-column:1/4;grid-row:2;min-width:84px;font-size:11px}.speed-controls .wide{font-size:10px}.pause-control{height:52px;min-width:48px;font-size:20px}
.challenge-hud{position:absolute;z-index:9;pointer-events:none;left:14px;bottom:78px;display:flex;align-items:center;gap:10px;max-width:min(510px,55%);padding:9px 10px;background:linear-gradient(90deg,rgba(4,6,9,.90),rgba(4,6,9,.68));border:1px solid rgba(255,255,255,.2);border-left:3px solid #66e9ff;border-radius:7px;box-shadow:0 8px 26px rgba(0,0,0,.35)}.challenge-icon{font-size:25px;color:#67eaff}.challenge-copy{display:grid;gap:1px;min-width:0}.challenge-copy span{font-size:8px;color:#72eaff;font-weight:900;letter-spacing:.12em}.challenge-copy strong{font-size:clamp(13px,1.4vw,19px)}.challenge-copy small{font-size:10px;color:#adbac6;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.hud-btn{pointer-events:auto;margin-left:auto;border:1px solid #3c5963;background:#17262d;color:#7befff;border-radius:4px;padding:8px 10px;font-size:9px;font-weight:900;letter-spacing:.08em;cursor:pointer}
.feedback-toast{position:absolute;z-index:12;left:50%;top:50%;transform:translate(-50%,-50%) scale(.96);min-width:min(620px,86%);display:none;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:14px 16px;background:rgba(6,9,12,.94);border:1px solid rgba(255,255,255,.22);border-radius:10px;box-shadow:0 18px 55px rgba(0,0,0,.6);backdrop-filter:blur(12px)}.feedback-toast.show{display:grid;animation:toastIn .18s ease forwards}.feedback-toast.good{border-color:rgba(102,242,155,.65)}.feedback-toast.bad{border-color:rgba(255,104,104,.65)}.feedback-icon{font-size:30px;font-weight:900}.good .feedback-icon{color:var(--good)}.bad .feedback-icon{color:var(--bad)}.feedback-toast strong{display:block;font-size:18px}.feedback-toast span{display:block;margin-top:2px;color:#afbbc6;font-size:12px;line-height:1.35}.feedback-toast button{border:0;border-radius:5px;background:#e8f8fc;color:#071017;font-weight:900;padding:10px 13px;cursor:pointer}@keyframes toastIn{to{transform:translate(-50%,-50%) scale(1)}}
.training-card,.simulator-card{position:absolute;z-index:11;right:18px;top:70px;width:min(340px,42%);padding:16px;background:rgba(5,8,12,.91);border:1px solid rgba(255,255,255,.22);border-radius:9px;box-shadow:0 16px 46px rgba(0,0,0,.45);backdrop-filter:blur(10px)}.training-card span,.simulator-card span{display:block;font-size:9px;color:#5ee9ff;font-weight:900;letter-spacing:.13em}.training-card h2{margin:5px 0 8px;font-size:22px}.training-card p,.simulator-card small{display:block;color:#bac4ce;line-height:1.45;font-size:12px}.training-card button,.simulator-card button{margin-top:12px;width:100%;border:1px solid #3b6570;background:#17303a;color:#7ef1ff;padding:9px;border-radius:5px;font-size:10px;font-weight:900;cursor:pointer}.simulator-card strong{display:block;font-size:18px;margin:6px 0}.hidden{display:none!important}
.tap-pulse{position:absolute;z-index:10;width:38px;height:38px;border:2px solid white;border-radius:50%;transform:translate(-50%,-50%);pointer-events:none;display:none;box-shadow:0 0 0 4px rgba(255,255,255,.15)}.tap-pulse.show{display:block;animation:pulse .7s ease-out forwards}@keyframes pulse{0%{opacity:1;scale:.45}100%{opacity:0;scale:1.45}}
.bezel-footer{height:48px;display:flex;align-items:center;gap:17px;padding:0 8px;font-size:9px;text-transform:uppercase;letter-spacing:.08em;color:#8e9aa7}.bezel-footer>div{display:flex;align-items:center;gap:5px}.key-dot{display:inline-block;width:11px;height:6px;border-radius:2px}.key-dot.blue{background:#1612d3}.key-dot.cyan{background:#27e8ef}.key-dot.yellow{background:#f1e93b}.key-dot.red{background:#d93113}.history-key{margin-left:auto}.history-key i{display:block;width:90px;border-top:1px solid #5e6874;position:relative}.history-key i:after{content:"";position:absolute;right:-1px;top:-3px;border-left:5px solid #8793a0;border-top:3px solid transparent;border-bottom:3px solid transparent}.bezel-footer button{border:1px solid #37414c;background:#151a21;border-radius:4px;color:#a9b4c0;padding:7px 10px;font-size:9px;font-weight:800;cursor:pointer}
@media(max-width:900px){.app-header{grid-template-columns:1fr auto;height:auto;min-height:62px;padding:9px 12px}.mode-tabs{grid-column:1/3;grid-row:2;margin-top:7px}.player-strip{gap:10px}.display-frame{padding:6px}.sonar-bezel{padding:5px;border-radius:9px}.screen-wrap{min-height:440px;aspect-ratio:auto;height:calc(100vh - 165px)}.challenge-hud{max-width:72%;bottom:74px}.challenge-copy small{display:none}.sonar-bottom-controls{gap:4px}.control-cluster:nth-child(3){display:none}.compass-badge{top:92px;min-width:98px}.mini-compass{right:8px;bottom:118px;width:84px;height:84px}.bezel-footer{gap:8px}.bezel-footer>div:nth-child(-n+4){display:none}}
@media(max-width:600px){.brand small{display:none}.brand-ping{width:28px;height:28px}.brand strong{font-size:14px}.player-strip span:nth-child(1){display:none}.mode-tab{padding:8px 10px;font-size:9px}.screen-wrap{height:calc(100vh - 150px);min-height:430px}.telemetry{top:4px;left:7px}.depth-readout span{font-size:55px}.depth-readout small{font-size:22px}.challenge-hud{left:7px;right:7px;max-width:none;bottom:69px}.hud-btn{display:none}.control-cluster strong{min-width:42px}.control-cluster button{min-width:34px}.range-controls .auto{font-size:8px}.compass-badge{display:none}.mini-compass{right:6px;bottom:109px;width:66px;height:66px}.mini-compass-label{font-size:8px;bottom:8px}.mini-compass-mark{font-size:8px}.ascope-panel{right:0;width:34px}.ascope-label{font-size:7px;top:6px}.depth-scale{right:36px;width:46px}.training-card,.simulator-card{left:9px;right:9px;top:115px;width:auto}.bezel-footer{display:none}}

/* V2.3 progression */
.difficulty-stat b{font-size:11px!important;letter-spacing:.08em;padding:3px 6px;border-radius:4px;border:1px solid #3b4652;background:#111820;color:#8ceeff!important}
.difficulty-stat b[data-tier="rookie"]{color:#78f0b1!important;border-color:#2a6b50;background:#0c241b}
.difficulty-stat b[data-tier="intermediate"]{color:#76ddff!important;border-color:#29677a;background:#0b2029}
.difficulty-stat b[data-tier="advanced"]{color:#ffd66f!important;border-color:#7b6126;background:#2c220b}
.difficulty-stat b[data-tier="expert"]{color:#ff8585!important;border-color:#7d3131;background:#2d0d0d;box-shadow:0 0 12px rgba(255,92,92,.16)}
@media(max-width:600px){.difficulty-stat{display:none!important}}