.ahmg{
  --bg:#0b0d12; --card:#121722; --sunken:#0e131d; --line:#263044;
  --text:#f7f8fb; --muted:#9ca7bb; --accent:#8dff77;
  --bass:#70d7ff; --piano:#c7a5ff; --melody:#ffcf70; --pad:#7de3c0;
  --vocal:#ff8fb1; --harm:#ffb37d; --drums:#8f9bb3; --import:#f2f56b;
  max-width:1180px; margin:30px auto; padding:28px;
  border:1px solid #222b3a; border-radius:26px;
  background:radial-gradient(circle at 80% 0,#1d2638 0,transparent 34%),var(--bg);
  color:var(--text); font-family:Inter,system-ui,sans-serif;
  box-shadow:0 30px 80px rgba(0,0,0,.28);
}
.ahmg *{box-sizing:border-box}
.ahmg__sronly{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* hero -------------------------------------------------------------- */
.ahmg__hero{display:flex;justify-content:space-between;gap:24px;align-items:flex-end;flex-wrap:wrap}
.ahmg__herotext{flex:1 1 420px}
.ahmg__eyebrow{font-size:12px;letter-spacing:.18em;color:var(--accent);font-weight:800}
.ahmg h2{font-size:clamp(26px,3.6vw,42px);line-height:1.05;margin:10px 0 12px}
.ahmg p{color:var(--muted);max-width:68ch;margin:0;line-height:1.55}
.ahmg__transport,.ahmg__actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}

/* buttons ----------------------------------------------------------- */
.ahmg__button{
  border:1px solid var(--line);background:#151b27;color:#fff;border-radius:13px;
  padding:11px 16px;font-weight:700;font-size:14px;cursor:pointer;
  transition:background .15s ease,border-color .15s ease;
}
.ahmg__button:hover{background:#1c2433}
.ahmg__button:focus-visible,.ahmg__chip:focus-visible,.ahmg__mini:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.ahmg__button--accent{background:var(--accent);border-color:var(--accent);color:#071007}
.ahmg__button--accent:hover{background:#a1ff90}
.ahmg__button--big{padding:14px 24px;font-size:15px}
.ahmg__button:disabled{opacity:.4;cursor:not-allowed}
.ahmg__spacer{flex:1}
.ahmg__actions{margin:22px 0}

/* controls ---------------------------------------------------------- */
.ahmg__controls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:26px 0 18px}
.ahmg__controls--three{grid-template-columns:repeat(3,minmax(0,1fr));margin:0}
.ahmg label{display:grid;gap:7px;color:var(--muted);font-size:12px;font-weight:700}
.ahmg select,.ahmg input[type=number],.ahmg input[type=text],.ahmg textarea{
  width:100%;border:1px solid var(--line);border-radius:12px;background:var(--sunken);
  color:var(--text);padding:11px 13px;min-height:44px;font:inherit;font-size:14px;font-weight:500;
}
.ahmg textarea{resize:vertical;line-height:1.5;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.ahmg textarea[readonly]{color:var(--muted)}
.ahmg input[type=range]{width:100%;accent-color:var(--accent);min-height:24px}

/* grouped blocks ---------------------------------------------------- */
.ahmg__block{border:1px solid var(--line);border-radius:16px;padding:16px 18px 18px;margin:0 0 14px;background:rgba(14,19,29,.55)}
.ahmg__block legend{padding:0 8px;font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
.ahmg__sliders{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}
.ahmg__slider span{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.ahmg__slider b{color:var(--text);font-variant-numeric:tabular-nums;font-size:13px}
.ahmg__hint{color:var(--muted);font-size:12px;margin:10px 0 0;line-height:1.5}
.ahmg__error{color:#ff9a9a;font-size:12px;margin:8px 0 0;font-weight:600}
.ahmg__chordrow{display:flex;gap:12px;align-items:flex-start;flex-wrap:wrap}
.ahmg__chordrow>label:first-child{flex:0 0 160px}
.ahmg__grow{flex:1 1 320px}
.ahmg__check{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;font-weight:600}
.ahmg__check input{accent-color:var(--accent);width:16px;height:16px}

/* track picker ------------------------------------------------------ */
.ahmg__tracks{display:flex;gap:10px;flex-wrap:wrap}
.ahmg__track{display:flex;align-items:center;gap:9px;background:#151b27;border:1px solid var(--line);
  padding:8px 10px;border-radius:11px;color:var(--text);cursor:pointer;font-size:13px;font-weight:600}
.ahmg__track input{accent-color:var(--accent);width:16px;height:16px}
.ahmg__track--sub{color:var(--muted);cursor:default}
.ahmg__mini{border:1px solid var(--line);background:var(--sunken);color:var(--muted);
  border-radius:8px;min-width:26px;height:26px;padding:0 6px;cursor:pointer;font-size:12px;font-weight:700}
.ahmg__mini:hover:not(:disabled){color:var(--accent);border-color:var(--accent)}
.ahmg__mini:disabled{opacity:.3;cursor:not-allowed}

/* import ------------------------------------------------------------ */
.ahmg__importrow{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:12px}
.ahmg__file{position:relative;display:inline-flex}
.ahmg__file input{position:absolute;inset:0;opacity:0;cursor:pointer}
.ahmg__file span{border:1px dashed var(--line);background:var(--sunken);color:var(--text);
  border-radius:12px;padding:11px 18px;font-size:13px;font-weight:700}
.ahmg__file:hover span{border-color:var(--accent);color:var(--accent)}
.ahmg__importrow .ahmg__hint{margin:0}
.ahmg__importpanel{display:flex;gap:14px;align-items:flex-end;flex-wrap:wrap;margin-top:14px;
  padding-top:14px;border-top:1px solid var(--line)}
.ahmg__importpanel>label{flex:0 0 240px}
.ahmg__suggest{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:14px;width:100%}
.ahmg__suglabel{font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-right:2px}
.ahmg__chip{border:1px solid var(--line);background:#151b27;color:var(--text);border-radius:999px;
  padding:8px 14px;font-size:12px;font-weight:600;cursor:pointer}
.ahmg__chip:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}
.ahmg__chip:disabled{opacity:.35;cursor:not-allowed}

/* progression ------------------------------------------------------- */
.ahmg__progression{margin:22px 0}
.ahmg__sectionlabel{color:var(--muted);text-transform:uppercase;letter-spacing:.12em;font-size:11px;font-weight:900;margin-bottom:9px}
.ahmg__chords{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.ahmg__chord{padding:12px 14px;border:1px solid var(--line);border-radius:13px;background:linear-gradient(145deg,#151b27,#10151f)}
.ahmg__chord small{display:block;color:var(--muted);font-size:10px;letter-spacing:.1em}
.ahmg__chord strong{display:block;font-size:19px;margin-top:3px;line-height:1.2}

/* piano roll -------------------------------------------------------- */
.ahmg__panel{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden}
.ahmg__panelhead{display:flex;justify-content:space-between;gap:12px;padding:14px 16px 8px;color:var(--muted);font-size:13px;flex-wrap:wrap}
.ahmg__panelhead strong{color:var(--text)}
.ahmg__legend{display:flex;gap:14px;flex-wrap:wrap;padding:0 16px 12px;color:var(--muted);font-size:11px}
.ahmg__legend span{display:flex;align-items:center;gap:6px}
.ahmg__dot{width:8px;height:8px;border-radius:50%;display:inline-block}
.ahmg__dot--bass{background:var(--bass)}
.ahmg__dot--piano{background:var(--piano)}
.ahmg__dot--melody{background:var(--melody)}
.ahmg__dot--pad{background:var(--pad)}
.ahmg__dot--vocal{background:var(--vocal)}
.ahmg__dot--harm{background:var(--harm)}
.ahmg__dot--drums{background:var(--drums)}
.ahmg__dot--import{background:var(--import)}
.ahmg__grid{height:420px;position:relative;overflow:hidden;background:linear-gradient(#151b27 1px,transparent 1px);background-size:100% 24px}
.ahmg__grid>i{position:absolute;top:0;bottom:0;width:1px;background:#1d2534}
.ahmg__grid>i.beat{background:#303c53}
.ahmg__grid>i.bar{width:2px;background:#4a5d7c}
.ahmg__grid b.note{position:absolute;height:9px;min-width:4px;border-radius:3px}
.ahmg__grid b.note--bass{background:var(--bass)}
.ahmg__grid b.note--piano{background:var(--piano)}
.ahmg__grid b.note--melody{background:var(--melody)}
.ahmg__grid b.note--pad{background:var(--pad);height:7px}
.ahmg__grid b.note--vocal{background:var(--vocal);height:11px}
.ahmg__grid b.note--harm{background:var(--harm)}
.ahmg__grid b.note--drums{background:var(--drums);height:6px}
.ahmg__grid b.note--import{background:var(--import)}

@media(prefers-reduced-motion:reduce){.ahmg *{transition:none!important}}
@media(max-width:1000px){
  .ahmg__controls{grid-template-columns:repeat(3,minmax(0,1fr))}
  .ahmg__sliders{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:800px){
  .ahmg{padding:18px;border-radius:18px}
  .ahmg__hero{align-items:flex-start;flex-direction:column}
  .ahmg__controls,.ahmg__controls--three{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ahmg__sliders{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ahmg__grid{height:320px}
  .ahmg__chords{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ahmg__chordrow>label:first-child{flex:1 1 100%}
}
@media(max-width:480px){
  .ahmg__controls,.ahmg__controls--three,.ahmg__sliders{grid-template-columns:1fr}
  .ahmg__transport,.ahmg__actions{width:100%}
  .ahmg__transport .ahmg__button,.ahmg__actions .ahmg__button{flex:1}
  .ahmg__spacer{display:none}
  .ahmg__chords{grid-template-columns:1fr}
  .ahmg__importpanel>label{flex:1 1 100%}
}