:root{--bg:#f7f7f4;--card:#fff;--ink:#1c1f24;--soft:#5a606b;--line:#d9dbd6;--acc:#1f5fd6;--acc-l:#dce7fb;--blk:#22252b}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:18px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--acc)}
.wrap{max-width:1240px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:9}
.top{background:var(--card);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:52px;gap:12px}
.brand{font-weight:700;font-size:20px;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:8px}
.brand span{color:var(--acc)}
.top nav a{margin-left:18px;font-size:17px;text-decoration:none;color:var(--ink)}
.top nav a[aria-current]{color:var(--acc);font-weight:600}
h1{font-size:28px;line-height:1.2;margin:18px 0 6px}
h2{font-size:24px;line-height:1.25;margin:32px 0 8px}
h3{font-size:20px;margin:22px 0 4px}
.lead{font-size:19px;color:var(--soft);margin:0 0 14px;max-width:62ch}
.piano{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px}
.kb-scroll{overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}
.kb{position:relative;height:clamp(170px,30vw,290px);display:flex;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
.piano[data-mode=full] .kb{min-width:1040px;height:clamp(180px,24vw,280px)}
.key{position:relative;cursor:pointer;display:flex;align-items:flex-end;justify-content:center}
.wht{flex:none;height:100%;background:#fff;border:1px solid #b9bcc2;border-radius:0 0 7px 7px;margin-right:-1px}
.blk{position:absolute;top:0;height:60%;background:var(--blk);border-radius:0 0 5px 5px;z-index:2;color:#fff}
.key.mark{background:var(--acc-l)}.blk.mark{background:#5d82c9}
.key.next{background:var(--acc);color:#fff}.key.next .kn,.key.next .kc{color:#fff}
.key.on{background:#c9d8f6}.blk.on{background:#4a6fb8}.key.next.on{background:#0f3f99}
.kl{display:flex;flex-direction:column;align-items:center;gap:2px;padding-bottom:8px;pointer-events:none;line-height:1}
.kc{font-size:15px;font-weight:600;color:var(--acc);border:1px solid currentColor;border-radius:4px;padding:2px 4px;min-width:20px;text-align:center}
.blk .kc{color:#bcd0f7}
.kn{font-style:normal;font-size:14px;color:var(--soft)}.blk .kn{color:#d6d8dc;font-size:11px}
.dense .kn{font-size:10px}.dense .kc{font-size:10px;padding:1px 2px;min-width:0}
.ctrls{display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center;margin-top:12px;font-size:17px}
.ctrls label{display:flex;align-items:center;gap:6px}
.btn{font:inherit;font-size:17px;min-height:44px;padding:6px 14px;border-radius:9px;border:1px solid var(--acc);background:#fff;color:var(--acc);cursor:pointer}
.btn[aria-pressed=true]{background:var(--acc);color:#fff}
.btn:disabled{opacity:.45;cursor:default}
.btn.sm{min-height:36px;font-size:15px;padding:3px 10px}.btn.ghost{border-color:var(--line);color:var(--soft)}
.btn.primary{background:var(--acc);color:#fff}
select,input[type=range]{font:inherit;font-size:17px;min-height:44px}
select{padding:4px 8px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
input[type=range]{width:120px;accent-color:var(--acc)}
.oct{display:flex;align-items:center;gap:6px}.oct output{min-width:2.4em;text-align:center;font-weight:600}
.panel{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-top:14px}
.panel h2{font-size:20px;margin:0 0 6px}
.status{min-height:1.6em;margin:8px 0 0;color:var(--soft)}
.saved{list-style:none;padding:0;margin:8px 0 0;min-height:1.7em}.saved li{margin:4px 0}
.hint-portrait{display:none;margin:0 0 8px;font-size:16px;color:var(--soft)}
@media (orientation:portrait) and (max-width:640px){.hint-portrait{display:block}}
.help{margin-top:16px}.help ul{padding-left:20px;margin:6px 0}
.prose{max-width:70ch}
.prose table{border-collapse:collapse;margin:10px 0;font-size:17px}.prose th,.prose td{border:1px solid var(--line);padding:6px 10px;text-align:left}
.songlist{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.songlist a{display:block;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 14px;text-decoration:none;font-weight:600}
.notes{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:17px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 14px;line-height:1.9}
.soft{color:var(--soft)}
footer{margin-top:48px;border-top:1px solid var(--line);background:var(--card);font-size:15px;color:var(--soft)}
footer .wrap{padding-top:18px;padding-bottom:24px}
footer ul{list-style:none;padding:0;margin:0 0 10px;display:flex;flex-wrap:wrap;gap:6px 16px}
footer p{margin:4px 0}
.nojs{background:#fff3cd;padding:8px 12px;border-radius:8px}
html.js .nojs{display:none}
@media (max-width:640px){body{font-size:17px}h1{font-size:24px}.top nav a{margin-left:12px;font-size:16px}.brand{font-size:18px}.kb{height:200px}.piano{padding:8px}}
@media (orientation:landscape) and (max-height:500px){h1{margin:6px 0 2px;font-size:20px}.lead{display:none}.kb{height:52vh}.top .wrap{height:44px}}
:fullscreen{background:var(--bg);padding:16px;overflow:auto}
:fullscreen .kb{height:60vh!important}
@media print{.piano,.panel,.top nav{display:none}}