#hud{position:fixed;inset:0;z-index:6;pointer-events:none}
#bar{position:fixed;top:0;left:0;height:2px;width:0%;z-index:7;
  background:linear-gradient(90deg,var(--blue),var(--cyan));box-shadow:0 0 12px rgba(111,227,255,.6)}
.hud-tl{position:fixed;top:26px;left:30px;display:flex;align-items:center;gap:14px}
.mark{width:34px;height:34px;border:1px solid var(--line);display:grid;place-items:center;
  font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:.08em;color:var(--cyan);
  background:rgba(8,12,18,.45);backdrop-filter:blur(6px)}
.hud-name{font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:.28em;color:var(--dim)}
#audioBtn{position:fixed;top:26px;right:30px;pointer-events:auto;cursor:pointer;
  font-family:'JetBrains Mono',monospace;font-size:10px;letter-spacing:.22em;color:var(--dim);
  border:1px solid var(--line);background:rgba(8,12,18,.45);backdrop-filter:blur(6px);
  padding:10px 14px;transition:color .3s,border-color .3s}
#audioBtn:hover{color:var(--cyan);border-color:rgba(111,227,255,.4)}
#audioBtn.on{color:var(--cyan)}
#sectLabel{position:fixed;left:30px;bottom:28px;font-family:'JetBrains Mono',monospace;
  font-size:10px;letter-spacing:.3em;color:var(--dim);display:flex;gap:14px;align-items:center}
#sectLabel b{color:var(--cyan);font-weight:500}
#sectLabel .rule{width:46px;height:1px;background:var(--line)}
#scrollCue{position:fixed;left:50%;bottom:34px;transform:translateX(-50%);z-index:6;
  display:flex;flex-direction:column;align-items:center;gap:10px;pointer-events:none;
  font-family:'JetBrains Mono',monospace;font-size:10px;letter-spacing:.4em;
  color:var(--cyan);text-shadow:0 0 14px rgba(0,0,0,.85),0 0 6px rgba(0,0,0,.9)}
#scrollCue .stem{width:2px;height:44px;background:linear-gradient(var(--cyan),transparent);
  box-shadow:0 0 8px rgba(111,227,255,.7);animation:stem 2.2s ease-in-out infinite}
@keyframes stem{0%,100%{transform:scaleY(.4);opacity:.4}50%{transform:scaleY(1);opacity:1}}