:root{--bg:#071e29;--mint:#96e6ce;--coral:#ffa184;--cream:#f3f1e3;--muted:#93aeb7;--line:#2b4e5a;--gold:#f5d983}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--cream);font:14px/1.5 Inter,'Segoe UI','PingFang SC','Microsoft Yahei',sans-serif}button{font:inherit;cursor:pointer;color:inherit;border:0;transition:background .15s,transform .12s}button:hover{filter:brightness(1.12)}button:active{transform:translateY(1px)}button:disabled{cursor:default;opacity:.55}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--gold);outline-offset:4px}.hidden{display:none!important}.header{height:88px;max-width:1440px;margin:auto;padding:0 42px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #1c3946}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--cream);font-weight:850;letter-spacing:1.3px;font-size:18px}.brand small{display:block;font-size:9px;letter-spacing:2.5px;color:var(--muted);font-weight:500;margin-top:2px}.header-actions{display:flex;align-items:center;gap:19px}.private{font-size:8px;letter-spacing:1.5px;color:var(--muted);display:flex;gap:8px;align-items:center}.private>i,.status-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--mint)}.language{display:flex;gap:3px;padding:3px;border:1px solid #36515c;border-radius:7px}.language button{padding:4px 8px;border-radius:4px;background:none;color:var(--muted);font-size:10px}.language button.active{background:#264a56;color:var(--cream)}.icon-button{background:none;color:var(--muted);padding:8px;font-size:18px}.outline{border:1px solid #49616b;border-radius:8px;background:transparent;padding:12px 24px}.small{padding:8px 15px;font-size:11px}main{max-width:1440px;margin:auto;padding:23px 42px 0}.game-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.eyebrow{font-size:9px;font-weight:650;letter-spacing:2px;color:var(--muted)}.version{font-size:8px;letter-spacing:1.5px;color:#7996a2}.arena-shell{border:1px solid #355563;border-radius:15px;overflow:hidden;box-shadow:0 25px 70px #0002;background:#123d4b}.canvas-wrap{position:relative;aspect-ratio:16/9;min-height:520px;overflow:hidden}#ocean{width:100%;height:100%;display:block;position:absolute;inset:0;outline:none;touch-action:none}.overlay{position:absolute;inset:0;z-index:4}.setup{display:flex;align-items:center;padding:38px 58px;background:linear-gradient(90deg,#092933ed,#092933c9 35%,#09293300 78%)}.setup-copy{max-width:500px;width:45%}.mint-text{color:var(--mint)}h1{font-size:clamp(48px,5vw,72px);line-height:1.04;letter-spacing:-3.6px;margin:18px 0 23px;font-weight:800}h1 em{font-style:normal;color:var(--mint)}.objective{font-size:16px;line-height:1.6;max-width:380px;margin:0 0 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.primary{max-width:365px}.practice{width:100%;max-width:365px;display:flex;align-items:center;justify-content:space-between;background:none;border:1px solid #45616c;border-radius:8px;padding:12px 20px;margin-top:10px;color:#d1e0dd;font-size:12px}.setup-links{display:flex;gap:19px;margin-top:11px;flex-wrap:wrap}.text-button{background:none;color:var(--muted);font-size:10px;padding:6px 0}.setup-settings{margin-top:12px;display:flex;align-items:center;justify-content:space-between;max-width:365px;padding:11px 13px;border:1px solid #416370;border-radius:8px;background:#082731c7}.setup-settings strong{font-size:11px;font-weight:500}.setup-settings p{font-size:9px;color:var(--muted);margin:3px 0 0}.switch{width:36px;min-width:36px;height:21px;border:1px solid #5a747b;border-radius:20px;background:#28424b;padding:3px;display:flex;align-items:center}.switch i{width:13px;height:13px;border-radius:50%;background:#a9b8b9;transition:transform .2s}.switch[aria-checked=true]{background:var(--mint);border-color:var(--mint)}.switch[aria-checked=true] i{background:#143d42;transform:translateX(14px)}.ocean-caption{position:absolute;right:5%;bottom:9%;display:flex;gap:13px;align-items:start}.ocean-caption>span{color:var(--gold);font-size:20px}.ocean-caption p{font-size:11px;line-height:1.7;color:#d1e2dfbf;margin:0;letter-spacing:.5px}.error{font-size:11px;color:var(--coral);line-height:1.6;max-width:380px;margin:10px 0 0}.error:empty{display:none}.field-label{position:absolute;bottom:20px;left:25px;letter-spacing:2px;font-size:8px;color:#a2c5cc55;pointer-events:none}.field-label span{display:block;font-size:7px;letter-spacing:1px;margin-top:4px}.below{display:flex;justify-content:space-between;gap:15px;padding:18px 1px 20px;border-bottom:1px solid #1c3946;font-size:9px;color:var(--muted)}.controls,.legend{display:flex;align-items:center;gap:16px}.controls>span{white-space:nowrap}.control-title{font-size:8px;letter-spacing:1.6px;color:#c5d2d4}.controls kbd{height:20px;min-width:20px;font-size:9px;margin-right:3px}.controls span[data-i18n]{margin-right:9px}.legend>span{display:flex;align-items:center;gap:7px;white-space:nowrap}.legend i{display:inline-block;width:6px;height:6px;border-radius:50%}.mint-dot{background:var(--mint)}.coral-dot{background:var(--coral)}.gold-dot{background:var(--gold)}.legend .gold-outline{width:9px;height:9px;border:1px solid var(--gold);background:transparent;box-shadow:0 0 7px #f5d98350}footer{display:flex;justify-content:space-between;color:#6d8e99;font-size:9px;letter-spacing:.5px;padding:18px 0 24px}footer>span:last-child{font-size:8px;letter-spacing:1.6px}footer i{font-style:normal;color:var(--mint);margin:0 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.1s}.experiment-live{display:flex;gap:10px;align-items:center;font-size:10px;border-left:1px solid #35505c;padding-left:20px}.banner{position:absolute;left:50%;top:25px;transform:translate(-50%,-8px);text-align:center;color:var(--cream);background:#092a37e8;border:1px solid #6a929b70;border-radius:10px;padding:13px 27px;opacity:0;transition:opacity .18s,transform .18s;pointer-events:none;z-index:3;min-width:250px;box-shadow:0 10px 30px #0002}.banner strong{font-size:19px;letter-spacing:.7px;display:block}.banner span{font-size:10px;color:#afc8ce;display:block;margin-top:2px}.banner.show{opacity:1;transform:translate(-50%,0)}.banner.gold{border-color:#b4a77e;color:var(--gold)}.edge-cue{position:absolute;top:36%;left:7px;z-index:2;color:var(--gold);background:#122f3fc9;border:1px solid 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@media(min-width:1500px){.canvas-wrap{min-height:660px}.setup{padding:48px 65px}h1{font-size:76px}.setup-copy{max-width:520px}}
@media(max-width:1100px){.header{padding:0 25px;height:78px}main{padding:20px 25px 0}.setup{padding:30px 35px}.setup-copy{width:53%;max-width:470px}.canvas-wrap{min-height:550px}h1{font-size:59px}.objective{font-size:14px}.intro{font-size:11px}.control-card{gap:15px}.controls,.legend{gap:10px}.growth-meter{display:none}.play-toolbar{gap:15px;padding:12px 18px}.mark-label{font-size:6px}.setup-links{gap:13px}}
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@media(pointer:coarse){.touch-controls:not(.hidden){display:flex}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
@media(min-width:761px){.arena-shell:has(.hud:not(.hidden)) .canvas-wrap{min-height:0;max-height:calc(100dvh - 310px)}}
.banner.center,.banner.center.show{top:42%;transform:translate(-50%,-50%);padding:18px 30px;background:#092a37f2;max-width:92%;min-width:280px}.banner.center strong{font-size:22px}.banner.center span{font-size:11px;max-width:420px;line-height:1.6}
#result{--winner:#96e6ce;background:radial-gradient(ellipse at 50% 30%,#285746a6,#061c2cee 72%)}#result[data-winner="1"]{--winner:#ffa184;background:radial-gradient(ellipse at 50% 30%,#6c493ba6,#061c2cee 72%)}#result[data-winner="draw"]{--winner:#f5d983}.result-modal{position:relative;isolation:isolate;max-width:570px;border:2px solid var(--winner);box-shadow:0 0 60px #96e6ce26,0 30px 100px #0006;overflow:hidden}.result-modal .result-medal{color:var(--winner);font-size:62px;line-height:1;margin:2px 0 8px;text-shadow:0 0 26px #f5d98360}.result-modal #result-title{font-size:clamp(35px,4.5vw,56px);font-weight:900;letter-spacing:-1.8px;line-height:1.08;color:var(--winner);margin:5px 0 9px;text-wrap:balance}.result-modal #result-identity{font-size:11px;color:var(--cream);margin:2px 0 8px}.result-modal #result-identity:empty{display:none}.result-modal .eyebrow{color:#d7e4dd;letter-spacing:2.3px}.result-table{position:relative;z-index:1}.result-row:nth-child(2){font-weight:750;font-size:15px;background:#ffffff08;padding:9px 6px;border-radius:6px}.victory-burst{position:absolute;inset:0;z-index:-1;pointer-events:none}.victory-burst i{position:absolute;left:50%;top:15%;font-style:normal;color:var(--winner);font-size:19px;opacity:0;--angle:calc(var(--i)*36deg);transform:rotate(var(--angle)) translateY(35px)}#result:not(.hidden) .result-modal{animation:result-arrive .48s cubic-bezier(.16,1,.3,1) both}#result:not(.hidden) #result-title{animation:winner-pop .65s cubic-bezier(.16,1,.3,1) both}#result:not(.hidden) .victory-burst i{animation:victory-sparks 1.7s ease-out both;animation-delay:calc(var(--i)*35ms)}@keyframes result-arrive{from{opacity:0;transform:translateY(28px) scale(.9)}to{opacity:1;transform:none}}@keyframes winner-pop{0%{opacity:0;transform:scale(.72)}60%{opacity:1;transform:scale(1.06)}100%{opacity:1;transform:scale(1)}}@keyframes victory-sparks{0%{opacity:0;transform:rotate(var(--angle)) translateY(30px) scale(.4)}22%{opacity:.85}100%{opacity:0;transform:rotate(var(--angle)) translateY(240px) scale(1.2)}}
.result-modal{max-height:100%;overflow-y:auto;padding:18px 28px}.result-modal .result-medal{font-size:45px}.result-modal #result-title{font-size:clamp(33px,4vw,48px)}.result-modal .result-row{padding:6px 0}
@media(max-width:760px){.result-modal{padding:15px 20px}.result-modal .result-medal{font-size:38px}.result-modal #result-title{font-size:35px;letter-spacing:-1px}.result-modal .result-row{padding:4px 0}.result-modal .result-row:nth-child(2){font-size:12px;padding:6px}.result-modal .result-table{margin-top:9px}.result-modal .experiment-summary{margin-top:8px}.result-modal .result-actions{margin-top:9px}}
@media(prefers-reduced-motion:reduce){#result *{animation:none!important}}
@media(max-width:760px){.banner.center,.banner.center.show{padding:13px 16px;min-width:250px}.banner.center strong{font-size:15px}.banner.center span{font-size:9px;max-width:290px}}
/* Keep one world unit the same size on both axes. The former gameplay
   max-height compressed the canvas vertically while leaving its width fixed. */
@media (min-width:761px){
  .header,main{max-width:none}
  .canvas-wrap,.arena-shell:has(.hud:not(.hidden)) .canvas-wrap{aspect-ratio:16/9;min-height:0;max-height:none}
}
@media (max-width:760px){
  .canvas-wrap:not(:has(.setup:not(.hidden))){aspect-ratio:16/9;min-height:0}
}
/* Environmental predators are part of every round. */
#settings,#setup-settings,.lobby-setting,.experiment-live{display:none!important}

/* Fit the complete 16:9 arena on a typical notebook while keeping one scale. */
.header{height:64px}
main{padding-top:12px}
.game-top{margin-bottom:8px}
.arena-shell:has(.hud:not(.hidden)){width:min(100%,calc(max(250px,100dvh - 245px)*16/9));margin-inline:auto}
.arena-shell:has(.hud:not(.hidden)) .canvas-wrap{aspect-ratio:16/9;min-height:0;max-height:none}
.joystick{width:138px;height:138px;position:relative;border-radius:50%;border:2px solid #91dfd68c;background:radial-gradient(circle,#194d5a99 0 35%,#153a4abb 36% 72%,#082c3dcc 73%);box-shadow:inset 0 0 28px #051c2b99,0 8px 26px #03182266;touch-action:none;user-select:none;flex:none}
.joystick-track{position:absolute;inset:10px;border:1px solid #9cdec850;border-radius:50%;pointer-events:none}
.joystick-track::before,.joystick-track::after{content:'';position:absolute;background:#b4e8d966;left:50%;top:50%;transform:translate(-50%,-50%)}
.joystick-track::before{width:1px;height:76%}.joystick-track::after{height:1px;width:76%}
.joystick-dot{position:absolute;inset:45%;border-radius:50%;background:#d8fff0aa}
.joystick-thumb{position:absolute;left:50%;top:50%;width:58px;height:58px;transform:translate(-50%,-50%);border:2px solid #e0fff6;border-radius:50%;background:radial-gradient(circle at 34% 28%,#d7fff1,#77d1bf 64%,#387c83);box-shadow:0 5px 16px #03182299;pointer-events:none;transition:box-shadow .12s}
.joystick.active .joystick-thumb{box-shadow:0 0 20px #adffe399,0 5px 16px #03182299}
@media(max-width:760px){.touch-controls{min-height:158px;padding:12px 22px max(14px,env(safe-area-inset-bottom))}.joystick{width:128px;height:128px}.touch-dash{width:82px;height:82px}}
@media(max-width:370px){.touch-controls{padding-inline:15px}.joystick{width:112px;height:112px}.joystick-thumb{width:52px;height:52px}}
/* Four-player cards preserve the full arena width. */
.hud.multi-hud{display:grid;grid-template-columns:minmax(0,1fr) 90px minmax(0,1fr);gap:10px;padding:8px 12px}.hud-team{display:flex;gap:10px;min-width:0}.multi-hud .player-hud{flex:1;min-width:0;display:block;color:var(--player-color)}.multi-hud .player-name{font-size:13px}.multi-hud .score{font-size:23px}.multi-hud .mark-label{font-size:10px}.growth-block{margin-top:3px}.growth-block small{display:block;font-size:11px;white-space:nowrap;color:#d7e7e7}.multi-hud .growth-meter{width:100%;height:6px;margin-top:3px}.multi-hud .growth-meter i{background:var(--player-color)}.multi-hud .clock{min-width:0}.multi-hud .clock b{font-size:25px}.multi-hud .clock span{font-size:9px}.join-room{display:flex;gap:8px;margin-top:8px}.join-room input{min-width:0;flex:1;width:100px;text-transform:uppercase;letter-spacing:4px;padding:7px 12px;background:#092632;border:1px solid #577e83;color:#fff;border-radius:7px;font:700 18px monospace}.join-room button{padding:7px 14px;border:1px solid #96e6ce66;background:#163c46;color:#b9f5df;border-radius:7px;white-space:nowrap}.seats{display:grid;grid-template-columns:1fr 1fr;gap:7px}.seats>div{padding:8px!important}.seats small{font-size:11px}.result-score-card .total-score{font-size:24px;color:#f3d99e;margin-top:5px}.result-score-card .total-score small{font-size:12px;display:inline}.fish-points{border-top:1px solid #96e6ce33;padding-top:12px;margin-top:14px}.fish-points h3{font-size:15px;color:#cfede3;margin:0 0 9px}.fish-points dl{margin:0;font-size:12px}.fish-points dl div{display:flex;justify-content:space-between;gap:5px;margin:7px 0}.fish-points dd{margin:0;color:#ffdf99;font-weight:700}.fish-points dt{color:#bdd4d4}
@media(max-width:600px){.hud.multi-hud{gap:5px;padding:6px;grid-template-columns:1fr 55px 1fr}.hud-team{gap:6px}.multi-hud .player-name{font-size:10px}.multi-hud .score{font-size:17px}.growth-block small{font-size:8px}.multi-hud .clock b{font-size:20px}.multi-hud .mark-label{display:none}.multi-hud .clock span{font-size:7px}.join-room input{font-size:15px}}