:root{color-scheme:dark}*{box-sizing:border-box}body{margin:0;background:#09141e;color:#e1eeef;font-family:system-ui,sans-serif}.shell{max-width:1120px;margin:auto;padding:28px 36px}main{margin-top:38px}.mast{display:flex;justify-content:space-between;align-items:end;margin-bottom:25px}.eyebrow{font-size:11px;letter-spacing:.22em;color:#71f5ef}h1{font-size:clamp(25px,4vw,44px);letter-spacing:-.04em;margin:8px 0}h1 span{color:#71f5ef}.tagline{color:#97adb6;font-size:13px}.hud{display:flex;justify-content:space-between;padding:15px 20px;border:1px solid #29414d;background:#11212d;font:13px ui-monospace,monospace;letter-spacing:.08em}.hud b{color:#71f5ef;margin-left:8px;font-weight:400}.arena{position:relative;border:1px solid #29414d;border-top:0;background:#09141e}canvas{width:100%;aspect-ratio:16/9;display:block;outline:none}#overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#09141eec;text-align:center}#overlay[hidden]{display:none}h2{font-size:clamp(32px,6vw,70px);line-height:.95;letter-spacing:-.05em;margin:15px 0;color:#edf8f7}#overlay-copy{font-size:13px;color:#aac1c8}button,select{font:11px system-ui;letter-spacing:.08em;border:1px solid #34515e;background:#132a36;color:#e1eeef;border-radius:0;padding:11px 16px;cursor:pointer}button:hover,button:focus-visible{border-color:#71f5ef;color:#71f5ef}#play{background:#71f5ef;color:#09232a;width:205px;margin:12px 0}#play span{float:right}#how{border:0;background:transparent}#instructions{font-size:12px;line-height:1.7}#instructions p{margin:8px}.caption{display:flex;justify-content:space-between;gap:15px;font:11px ui-monospace,monospace;color:#9ab2bc;padding:17px 0}.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;border-top:1px solid #29414d;padding:15px 0}.toolbar label{font-size:10px;letter-spacing:.08em}.toolbar select{margin-left:8px}input{accent-color:#71f5ef}.legend,footer,.mobile{font-size:11px;color:#8aa3ae;line-height:1.8}footer{margin-top:25px;border-top:1px solid #29414d;padding:16px 0}.mobile{display:none}@media(max-width:700px){.shell{padding:15px}.mast{display:block;margin-bottom:15px}main{margin-top:24px}.caption{flex-direction:column}.mobile{display:block}.legend{font-size:10px}.hud{font-size:10px;padding:12px 8px}#instructions{font-size:10px}#overlay:has(#instructions:not([hidden])) h2{display:none}}

/* Keep the playfield and the shared ad slot inside the viewport, as in BELUNEXA. */
html:has(body.viewport-game){height:100%;overflow:hidden;overscroll-behavior:none}
body.viewport-game{height:100dvh;min-height:0;overflow:hidden;overscroll-behavior:none}
body.viewport-game>.shell{height:100%;max-width:1440px;padding:0 max(12px,env(safe-area-inset-right)) env(safe-area-inset-bottom) max(12px,env(safe-area-inset-left));display:flex;flex-direction:column}
body.viewport-game .site-header{min-height:36px;padding:3px 0;gap:4px 12px;flex:none}
body.viewport-game .site-brand{min-height:28px;font-size:10px}
body.viewport-game .site-header-right{flex-basis:auto;gap:8px}
body.viewport-game .site-page-details{font-size:10px;gap:6px}
body.viewport-game .site-header .site-nav{font-size:10px;gap:10px}
body.viewport-game .site-header .site-nav a{min-height:28px}
body.viewport-game main{margin:0;min-height:0;flex:1;display:flex;flex-direction:column}
body.viewport-game .mast{flex:none;margin:0;padding:5px 0;align-items:center;gap:12px}
body.viewport-game .mast h1{font-size:25px;line-height:1.1;margin:0}
body.viewport-game .mast .eyebrow,body.viewport-game .tagline{display:none}
body.viewport-game .hud{flex:none;padding:7px 12px;font-size:11px}
body.viewport-game .arena{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;overflow:hidden;container-type:size}
body.viewport-game canvas{flex:none;width:min(100cqw,calc(100cqh * 16 / 9));height:min(100cqh,calc(100cqw * 9 / 16));aspect-ratio:16/9}
body.viewport-game .caption{flex:none;padding:5px 0;font-size:10px}
body.viewport-game .toolbar{flex:none;padding:5px 0;gap:6px}
body.viewport-game .toolbar button,body.viewport-game .toolbar select{padding:5px 10px;min-height:30px;font-size:10px}
body.viewport-game .legend{flex:none;margin:2px 0 5px;font-size:9px}
body.viewport-game .mobile{flex:none;margin:2px 0;font-size:10px}
body.viewport-game>.shell>.footer-ad{display:flex;justify-content:center;align-items:flex-start;flex:none;min-height:50px;max-height:clamp(50px,16dvh,100px);min-width:0;margin:0;overflow:hidden;text-align:center}
.footer-ad-content{flex:none;width:max-content;transform-origin:top center}
body.viewport-game #overlay{overflow:auto;padding:12px}
body.viewport-game #overlay h2{font-size:clamp(24px,6vh,54px);margin:8px 0}
@media(max-width:700px){body.viewport-game .site-header-right{flex-basis:100%;gap:2px 8px}body.viewport-game .mast h1{font-size:19px}body.viewport-game .caption{flex-direction:row}body.viewport-game .caption>span:last-child,body.viewport-game .legend{display:none}body.viewport-game .toolbar{gap:4px}body.viewport-game .toolbar label{font-size:9px}body.viewport-game .toolbar select{max-width:170px;margin-left:3px}body.viewport-game .toolbar button{padding:4px 6px}}
@media(max-height:500px){body.viewport-game .mast{padding:2px 0}body.viewport-game .mast h1{font-size:18px}body.viewport-game .hud{padding:4px 8px}body.viewport-game .legend,body.viewport-game .mobile{display:none}body.viewport-game .caption{padding:3px 0}body.viewport-game #overlay h2{font-size:24px}body.viewport-game #overlay .eyebrow{display:none}body.viewport-game #overlay:has(#instructions:not([hidden])) h2{display:none}}

.tutorial[hidden]{display:none}
.tutorial{flex:none;display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid #71f5ef66;background:#12313b;padding:8px 12px;margin:4px 0}
.tutorial>div:first-child{min-width:0}.tutorial span{font-size:10px;color:#71f5ef;letter-spacing:.06em}.tutorial strong{display:block;font-size:14px;margin:3px 0}.tutorial p{font-size:12px;line-height:1.5;margin:0;color:#d5e9ea}.tutorial-actions{display:flex;gap:6px;flex-wrap:wrap;flex:none;max-width:200px}.tutorial-actions button{min-height:32px;padding:6px 10px}.tutorial-actions button[hidden]{display:none}
.tutorial-focus{outline:2px solid #71f5ef;outline-offset:-2px}button:disabled,select:disabled{opacity:.4;cursor:default}
#tutorial-choice{position:fixed;inset:12px 0 calc(clamp(50px,16dvh,100px) + 12px);margin:auto;width:min(560px,calc(100vw - 28px));max-height:calc(100dvh - clamp(50px,16dvh,100px) - 24px);overflow:auto;padding:24px;border:1px solid #71f5ef80;background:#112b35;color:#e1eeef}
#tutorial-choice::backdrop{background:linear-gradient(to bottom,#020b12cc calc(100% - clamp(50px,16dvh,100px)),transparent calc(100% - clamp(50px,16dvh,100px)))}
#tutorial-choice h2{font-size:24px;line-height:1.4;margin:12px 0}#tutorial-choice p,#tutorial-choice li{font-size:13px;line-height:1.8}#tutorial-choice ul{padding-left:22px}.tutorial-choice-actions{display:flex;flex-wrap:wrap;gap:10px}.tutorial-choice-actions button{flex:1 1 180px;min-height:44px}#tutorial-start,#tutorial-action{background:#71f5ef;color:#09232a;border-color:#71f5ef}
@media(max-width:700px),(max-height:500px){.tutorial{padding:5px 8px;gap:6px}.tutorial strong{font-size:12px}.tutorial p{font-size:10px}.tutorial-actions{max-width:130px}.tutorial-actions button{font-size:10px;padding:4px 6px}}

.objective{display:flex;justify-content:space-between;gap:8px;padding:6px 12px;background:#17323d;font-size:12px;flex:none}.objective span{color:#aac1c8;font-size:11px}.race{height:4px;background:#29414d;flex:none}#clock-bar{height:100%;background:#71f5ef}#clock-bar.urgent{background:#ff566d}.race-status{display:flex;justify-content:space-between;gap:8px;padding:5px 12px;color:#bafcff;font-size:11px;flex:none}.hud{gap:8px;flex-wrap:wrap}@media(max-width:700px){.objective{flex-direction:column;font-size:11px;gap:2px}.objective span,.race-status{font-size:9px}.hud b{margin-left:3px}}

#next-stage{background:#71f5ef;color:#09232a;border-color:#71f5ef}#next-stage[hidden]{display:none}

.vector-preview{flex:none;margin:0;padding:5px 12px;border-top:1px solid #29414d;color:#bafcff;background:#11212d;font-size:11px;line-height:1.5}.vector-preview.danger{color:#ff8791}@media(max-width:700px){.vector-preview{font-size:10px;padding:4px 8px}}

/* Contextual practice card: visible task, progress, and one highlighted action. */
:root{--guide-accent:#71f5ef;--guide-panel:#112b35}
.arena .tutorial{position:absolute;z-index:2;top:12px;right:12px;display:block;width:min(360px,calc(100% - 24px));padding:14px 16px;margin:0;border:1px solid var(--guide-accent);border-radius:6px;background:var(--guide-panel);box-shadow:0 8px 28px #0007}
.arena .tutorial[hidden]{display:none}.tutorial-heading{display:flex;align-items:center;justify-content:space-between;gap:8px}.tutorial-heading button{min-height:28px;padding:4px 7px;font-size:10px;background:none;color:#aac1c8}.tutorial-progress{display:flex;gap:4px;margin:10px 0}.tutorial-progress span{flex:1;text-align:center;padding:4px 2px;border-bottom:2px solid #34515e;font-size:10px;color:#8aa3ae}.tutorial-progress .current{color:#09232a;background:var(--guide-accent);border-color:var(--guide-accent);font-weight:700}.tutorial-progress .done{color:var(--guide-accent);border-color:var(--guide-accent)}.arena .tutorial h2{font:700 17px/1.5 system-ui;margin:8px 0;letter-spacing:0}.arena .tutorial p{font-size:12px;line-height:1.65}.arena #tutorial-feedback{color:var(--guide-accent);margin-top:8px}.arena .tutorial-actions{display:flex;flex-direction:column;align-items:stretch;max-width:none;margin-top:12px}.arena #tutorial-control{font-size:14px;font-weight:700}.arena #tutorial-action{min-height:40px;font-size:12px}.tutorial-focus{outline:2px solid var(--guide-accent);outline-offset:-2px;animation:guide-pulse 1.5s ease-in-out infinite}@keyframes guide-pulse{50%{box-shadow:inset 0 0 14px #71f5ef55}}
@media(prefers-reduced-motion:reduce){.tutorial-focus{animation:none}}
@media(max-height:600px),(max-width:700px){.arena .tutorial{top:6px;right:6px;width:min(310px,calc(100% - 12px));padding:8px 10px}.arena .tutorial h2{font-size:13px;margin:4px 0}.arena .tutorial p{font-size:10px;line-height:1.5}.tutorial-progress{margin:5px 0}.arena .tutorial-actions{margin-top:6px}.arena #tutorial-control{font-size:12px}.arena #tutorial-action{min-height:30px;font-size:10px}}

.clear-menu{position:absolute;inset:0;z-index:3;display:flex;align-items:center;justify-content:center;padding:16px;background:#09141ec9}.clear-menu[hidden]{display:none}.clear-card{width:min(420px,100%);padding:24px;border:1px solid #71f5ef;border-radius:6px;background:#112b35;box-shadow:0 8px 28px #0007;text-align:center}.arena .clear-card h2{font:700 26px/1.4 system-ui;letter-spacing:0;margin:12px 0;color:#71f5ef}.clear-card p{font-size:12px;line-height:1.8;color:#bafcff}.clear-actions{display:flex;flex-direction:column;gap:10px;margin-top:20px}.clear-actions button{min-height:44px;font-size:13px}.clear-actions #next-stage{font-weight:700}.clear-actions button:focus-visible{outline:2px solid #ffe179;outline-offset:3px}@media(max-height:600px){.clear-card{padding:12px 18px}.arena .clear-card h2{font-size:20px;margin:6px 0}.clear-card p{margin:5px 0}.clear-actions{margin-top:10px;gap:6px}.clear-actions button{min-height:32px;padding:6px 10px}}

.enemy-guide{flex:none;display:flex;justify-content:center;flex-wrap:wrap;gap:4px 20px;padding:6px 12px;border-top:1px solid #29414d;background:#11212d;color:#d5e9ea;font-size:12px;line-height:1.5}.enemy-guide span{white-space:nowrap}.enemy-guide b{font-size:16px;margin-right:5px}.enemy-chaser{color:#ff925c}.enemy-orbiter{color:#b48aff}.enemy-charger{color:#ffe179}@media(max-width:700px),(max-height:500px){.enemy-guide{font-size:10px;gap:2px 12px;padding:4px 8px}.enemy-guide b{font-size:13px}}

/* Allow Japanese labels to wrap without squeezing the game area sideways. */
.hud > span, .race-status > span, .caption > span, .toolbar label { min-width:0; overflow-wrap:anywhere }
.toolbar select { max-width:min(240px,100%); }
.eyebrow { letter-spacing:.06em; line-height:1.6 }

.touch-controls{display:none;flex:none;justify-content:flex-end;padding:6px 0}.touch-controls button{touch-action:none;user-select:none;min-height:48px;padding:8px 24px;font-size:14px}#touch-dash{min-width:120px}canvas{touch-action:none}@media(any-pointer:coarse),(max-width:700px){.touch-controls{display:flex}body.viewport-game .mobile{display:block}}
@media(max-width:700px),(max-height:600px){html:has(body.viewport-game){overflow:auto}body.viewport-game{height:auto;min-height:100dvh;overflow:auto}body.viewport-game>.shell{min-height:100dvh;height:auto}body.viewport-game .arena{flex:none;height:auto;min-height:210px;container-type:normal}body.viewport-game canvas{width:100%;height:auto}.arena .tutorial{position:relative;inset:auto;width:100%;margin:0}.arena:has(.tutorial:not([hidden])){flex-direction:column}.clear-menu{overflow:auto}.clear-card{margin:auto}body.viewport-game .toolbar button{min-height:44px}body.viewport-game .toolbar select{min-height:44px}}