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@media(max-width:1100px){.site-header{gap:25px}.site-header nav{gap:23px}.hero{gap:22px}.hero h1{font-size:55px}.hero-description{font-size:17px}.hero-key{left:28px}.key-caption{left:178px;font-size:13px}.keyboard-route{left:170px}.features,.compatibility,.faq{gap:56px}.scenario-panel{gap:44px}.preview-main{padding:19px}.preview-rule{gap:10px}.section-aside{font-size:14px}.hero-stage{padding-top:159px}.app-preview{margin-left:0}.feature-grid{gap:34px 26px}.rule-list{gap:23px}}
@media(max-width:959px){.site-header nav{gap:18px}.site-header{gap:20px}.brand{font-size:23px}.hero{grid-template-columns:1fr 1fr;gap:12px;padding-block:70px 80px}.hero h1{font-size:44px}.hero-description{font-size:16px;line-height:1.9}.hero-actions{gap:18px;flex-wrap:wrap;margin-top:25px}.hero-actions .button{padding:12px 17px}.hero-meta{font-size:12px;gap:8px}.hero-stage{min-height:410px;padding-top:144px}.hero-key{width:103px;height:93px;left:18px;font-size:33px;top:16px}.key-caption{top:51px;left:140px;max-width:140px;line-height:1.7}.keyboard-route{left:130px;top:105px}.preview-title{padding-inline:13px}.preview-main{padding:17px 13px}.preview-rule{gap:8px;font-size:12px;padding-inline:10px}.rule-check{width:16px;height:16px}.preview-rule strong{font-size:14px}.preview-group{gap:9px}.group-mark{width:33px;height:36px}.preview-group strong{font-size:14px}.preview-group kbd{font-size:13px}.stage-note{font-size:12px;margin-left:0}.features,.compatibility,.faq{grid-template-columns:.85fr 1.15fr;gap:40px}.section{padding-block:72px}h2{font-size:31px}.feature-grid{gap:30px 24px}.feature h3{font-size:17px}.feature p{font-size:14px}.section-heading{align-items:flex-start}.section-aside{max-width:210px}.scenario-panel{grid-template-columns:.83fr 1.17fr;gap:30px}.scenario-copy h3{font-size:26px}.scenario-copy>p:not(.scenario-category){font-size:14px}.rule-list{gap:19px}.reading-scene{padding-inline:17px}.simulator-keyrow,.demo-controls{padding-inline:17px}.simulator-keyrow{gap:13px}.rhythm-track{gap:6px}.rhythm-track span{width:15px}.control-buttons{gap:9px}.control-buttons .button{font-size:14px;padding-inline:12px;gap:12px}.simulator-heading{padding-inline:15px;gap:10px}.game-scene{padding-inline:32px}.combo-steps{padding-inline:23px;gap:14px}.combo-steps kbd{width:64px;height:64px}.sequence-line{margin-inline:54px}.combo-note{margin-inline:20px}.start-steps{gap:28px}.faq{padding-top:24px}.site-footer{gap:16px;flex-wrap:wrap}.site-footer>p{font-size:12px}.copyright{width:100%;text-align:right;margin-top:-12px}.closing h2{font-size:28px}}
@media(max-width:719px){.site-header{height:auto;padding-top:17px;flex-wrap:wrap;column-gap:20px;row-gap:5px}.site-header .brand{margin-right:auto}.site-header nav{order:3;width:100%;justify-content:space-between;gap:12px;padding:6px 0}.site-header nav a{font-size:13px;min-height:44px}.header-action{padding:6px 14px;font-size:13px;gap:12px}.hero{grid-template-columns:1fr;gap:30px;padding-block:49px 66px}.hero h1{font-size:49px;margin-top:20px}.hero-description{max-width:450px;margin-top:23px}.hero-actions{flex-wrap:nowrap;gap:28px}.hero-meta{margin-top:23px;font-size:13px;gap:12px}.hero-stage{max-width:450px;width:100%;margin:auto;padding-top:134px;min-height:401px}.hero-key{left:35px;top:8px;width:102px;height:92px}.key-caption{left:165px;top:43px;max-width:none;font-size:14px}.keyboard-route{left:145px;right:42px;top:104px}.app-preview{margin-inline:12px}.preview-main{padding:22px}.preview-title{padding-inline:18px}.preview-rule{font-size:14px;padding:14px}.preview-rule strong{font-size:17px}.rule-check{width:19px;height:19px}.preview-group strong{font-size:16px}.preview-group{gap:12px}.group-mark{width:39px;height:40px}.preview-group kbd{font-size:14px}.stage-note{margin-top:23px;font-size:13px}.features,.compatibility,.faq{grid-template-columns:1fr;gap:36px}.features .section-intro h2 br{display:none}.section-intro>p:last-child{margin-top:18px}.feature-grid{gap:30px 27px}.feature p{font-size:15px}.feature h3{font-size:19px}.section-heading{display:block}.section-aside{margin-top:19px;max-width:none}.section-aside br{display:none}.scenario-panel{grid-template-columns:1fr;gap:28px}.scenario-copy h3 br{display:none}.scenario-copy h3{font-size:27px}.scenario-copy>p:not(.scenario-category){font-size:16px;margin-top:17px}.scenario-category{font-size:13px}.rule-list{gap:40px;margin-top:20px;padding-block:15px}.rule-list dt{margin-bottom:6px}.scenario-copy>p.scenario-footnote{font-size:14px}.simulator{width:100%;max-width:530px}.reading-scene{padding:22px 24px 10px}.simulator-keyrow,.demo-controls{padding-inline:24px}.rhythm-track{gap:12px}.rhythm-track span{width:24px}.reading-list strong{font-size:14px}.control-buttons .button{font-size:15px}.game-scene{min-height:277px}.combo-steps{padding-inline:37px}.combo-steps kbd{width:76px;height:74px}.sequence-line{margin-inline:78px}.combo-note{margin-inline:27px}.compatibility-item{gap:23px}.compatibility .section-intro h2 br{display:none}.start-steps{gap:22px}.start-steps h3{font-size:18px}.start-steps p{font-size:14px}.platform-label{display:block;margin-top:15px}.faq .section-intro>p:last-child br{display:none}.closing{display:block;padding-block:42px}.closing .button{margin-top:26px}.closing h2{font-size:29px}.site-footer{column-gap:20px;row-gap:15px}.site-footer>p{margin-left:auto}.release-status{margin-left:0}.copyright{margin:0;width:auto;margin-left:auto}.faq{padding-top:20px}}
@media(max-width:479px){.wrap{padding-inline:20px}.hero h1{font-size:42px;letter-spacing:-.045em}.hero .eyebrow{font-size:12px}.hero-description{font-size:16px}.hero-actions{gap:24px}.hero-actions .button{font-size:14px;padding-inline:17px;gap:17px}.hero-actions .text-link{font-size:14px;gap:10px}.hero-meta{font-size:12px;gap:10px}.hero-stage{min-height:396px}.hero-key{left:27px;width:93px;height:84px;font-size:30px}.key-caption{left:148px;top:34px;font-size:13px;max-width:155px}.keyboard-route{left:126px;right:18px;top:98px}.app-preview{margin-inline:0}.preview-main{padding:19px 17px}.preview-title{padding-inline:15px}.preview-rule{gap:10px;padding:13px 10px}.preview-rule strong{font-size:16px}.preview-group div>span{font-size:12px}.preview-label{font-size:12px}.stage-note{font-size:12px}.section{padding-block:64px}h2{font-size:29px}.feature-grid{grid-template-columns:1fr;gap:30px}.feature{position:relative;padding-left:54px}.feature-icon{position:absolute;left:0;top:0;width:32px;font-size:30px;margin:0}.language-icon{font-size:23px}.feature p{margin-top:8px}.section-intro>p:last-child{font-size:16px}.section-heading h2{line-height:1.45}.section-aside{font-size:15px}.demo-disclaimer{font-size:13px;line-height:1.8;margin-top:22px}.scenario-tabs{margin-top:25px}.scenario-tabs button{padding:13px 8px;font-size:14px;line-height:1.7}.scenario-panel{padding-top:30px}.scenario-copy h3{font-size:27px}.rule-list{gap:36px}.simulator-heading{font-size:12px;gap:12px;padding-inline:16px}.mini-label{font-size:11px}.reading-scene{padding-inline:16px}.reading-list li{padding-inline:9px;gap:12px}.reading-list strong{font-size:13px}.simulator-keyrow{padding:18px 17px;gap:14px}.rhythm-track{gap:7px}.rhythm-track span{width:19px}.demo-key{font-size:13px;padding-inline:10px;min-height:41px}.demo-count{font-size:12px;min-width:36px}.demo-controls{padding:16px 17px 20px}.demo-status{font-size:12px}.control-buttons .button{font-size:14px;min-height:48px;padding-inline:12px}.game-scene{padding-inline:30px}.combo-steps{padding-inline:21px;gap:12px}.combo-steps kbd{width:68px;height:67px;font-size:30px}.sequence-line{margin-inline:54px}.combo-note{margin:25px 20px 22px;font-size:13px;padding:13px}.compatibility-item{gap:19px}.compatibility-item p{font-size:14px}.compatibility-note{font-size:13px}.start-steps{grid-template-columns:1fr;gap:25px;margin-top:29px}.start-steps li{display:grid;grid-template-columns:38px 1fr;gap:7px 17px;padding-top:20px}.step-number{grid-row:1/3;margin-top:6px}.start-steps h3{margin-top:0;font-size:20px}.start-steps p{margin:0;font-size:15px;max-width:none}.faq{padding-top:8px}.faq-list summary{font-size:15px;min-height:67px;padding-block:21px}.faq-list details p{font-size:14px;padding-right:20px}.closing h2{font-size:27px}.closing .eyebrow{font-size:12px}.site-footer .brand{font-size:20px;gap:6px}.site-footer>p{font-size:11px}.site-footer{gap:16px 12px;padding-block:30px}.release-status,.copyright{font-size:11px}}
@media(max-width:359px){.wrap{padding-inline:16px}.hero h1{font-size:38px}.hero-actions{gap:17px}.hero-actions .button{font-size:13px;padding-inline:14px;gap:13px}.hero-actions .text-link{font-size:13px;gap:8px}.hero-meta{font-size:11px;gap:8px}.hero-key{left:16px;width:88px;height:80px}.key-caption{left:125px;max-width:150px}.preview-main{padding:17px 13px}.preview-rule{font-size:12px;gap:8px}.preview-rule strong{font-size:15px}.preview-group strong{font-size:15px}.rule-list{gap:25px}.scenario-tabs button{font-size:13px;padding-inline:4px}.reading-list strong{font-size:12px}.rhythm-track{gap:5px}.rhythm-track span{width:12px}.simulator-keyrow{gap:12px}.combo-steps{padding-inline:18px;gap:10px}.combo-steps kbd{width:59px;height:60px}.sequence-line{margin-inline:46px}.hero-stage{min-height:390px}.hero{gap:28px}.game-scene{padding-inline:25px}.section-heading h2{font-size:27px}.site-header nav{gap:8px}.site-header nav a{font-size:12px}.site-footer>p{max-width:116px;text-align:right}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.demo-key.is-pressed{transform:none;outline:2px solid var(--mint)}.hold-meter.is-holding>span{transform:scaleX(1)}}

/* Keep navigation, actions, and functional labels readable at every viewport. */
.site-header nav a,.header-action,.hero-actions .button,.hero-actions .text-link{font-size:14px}
.preview-label,.preview-rule,.preview-group div>span,.preview-footer,.key-caption,.mini-label,.demo-status,.hold-label,.game-timing,.rule-list dt,.reading-header,.reading-list strong,.scenario-tabs button,.demo-disclaimer,.stage-note,.inline-link,.simulator-heading,.demo-key,.preview-group kbd{font-size:14px}
.scenario-tabs button,.preview-rule,.preview-footer,.simulator-heading{overflow-wrap:normal}
.site-header nav a{min-width:44px;justify-content:center}
h1,h2,h3{text-wrap:balance}
@media(max-width:719px){.features .section-intro h2 br,.compatibility .section-intro h2 br{display:initial}}

/* Language selection uses the same surface and focus rules as the navigation. */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-header{height:auto;min-height:88px;flex-wrap:wrap;gap:20px}
.language-control{display:flex;align-items:center;gap:8px;min-height:44px;flex-shrink:0;border:1px solid var(--control-border);border-radius:8px;padding-left:12px}
.language-control svg{fill:none;stroke:var(--mint);stroke-width:1.5;flex-shrink:0}
.language-control select{font:14px var(--font);min-height:44px;min-width:100px;max-width:160px;background:var(--bg);color:var(--text);border:0;border-radius:8px;padding:0 9px;cursor:pointer}
.language-control select:focus-visible{outline:2px solid var(--mint-soft);outline-offset:4px}
.language-notice{flex-basis:100%;font-size:14px;color:var(--amber);padding-bottom:12px;margin-top:-8px}
.site-header nav{gap:20px}
:lang(en) .hero h1{font-size:58px;line-height:1.15}
:lang(en) .hero h1>span{display:inline-block}
:lang(en) .key-caption{max-width:220px}
.preview-rule,.preview-footer,.simulator-heading{flex-wrap:wrap}
.preview-rule .rule-key{white-space:nowrap}
.preview-footer{gap:10px}
.control-buttons .button{white-space:normal}
.demo-status{overflow-wrap:anywhere}
@media(max-width:1100px){.site-header nav{gap:14px}.site-header{gap:16px}.site-header .header-action{margin-left:auto}:lang(en) .site-header nav{order:3;width:100%;justify-content:space-between;margin:0;padding-bottom:8px}:lang(en) .hero h1{font-size:48px}}
@media(max-width:719px){.site-header{row-gap:8px}.site-header .brand{margin-right:auto}.language-control{margin-left:auto}.site-header nav{order:3;margin:0;padding-block:3px}.site-header .header-action{order:4;margin:0 0 14px;width:100%;justify-content:center}.language-notice{order:5}:lang(en) .hero h1{font-size:45px}.simulator-heading .mini-label{margin-left:auto}}
@media(max-width:359px){.site-header{column-gap:10px}.site-header .brand{font-size:21px;gap:6px}.site-header .brand img{width:32px;height:32px}.language-control{padding-left:8px;gap:4px}.language-control select{min-width:96px;padding-inline:5px}:lang(en) .hero h1{font-size:38px}:lang(en) .hero-actions{flex-wrap:wrap;gap:10px 22px}:lang(en) .hero-meta{font-size:12px;gap:8px}}