.round-button,
.quiet-button,
.action-button {
  border: 1px solid rgba(220, 231, 232, .14);
  color: rgba(220, 231, 232, .8);
  background: rgba(7, 8, 11, .38);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  cursor: pointer;
}

.round-button:focus-visible,
.quiet-button:focus-visible,
.action-button:focus-visible {
  outline: 2px solid rgba(154, 220, 224, .9);
  outline-offset: 3px;
}

.round-button {
  position: fixed;
  z-index: 4;
  right: var(--safe-right);
  bottom: var(--safe-bottom);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-family: Georgia, serif;
  font-size: 17px;
  font-style: italic;
  transition: background-color .4s ease, border-color .4s ease, opacity .4s ease;
}

.round-button:hover { background: rgba(18, 23, 32, .58); }

.panel-backdrop {
  position: fixed;
  z-index: 5;
  inset: 0;
  background: rgba(2, 3, 5, .38);
  opacity: 0;
  transition: opacity .55s ease;
}

.info-panel {
  position: fixed;
  z-index: 6;
  top: 50%;
  right: max(24px, env(safe-area-inset-right));
  width: min(430px, calc(100vw - 48px));
  max-height: min(760px, calc(100vh - 48px));
  padding: 30px;
  overflow: auto;
  transform: translateY(calc(-50% + 16px));
  border: 1px solid rgba(220, 231, 232, .11);
  border-radius: 26px;
  background: rgba(9, 11, 16, .76);
  box-shadow: 0 28px 80px rgba(0, 0, 0, .26);
  -webkit-backdrop-filter: blur(30px) saturate(115%);
  backdrop-filter: blur(30px) saturate(115%);
  opacity: 0;
  transition: opacity .55s ease, transform .55s cubic-bezier(.22, .8, .22, 1);
}

.info-panel.is-open {
  opacity: 1;
  transform: translateY(-50%);
}

.panel-backdrop.is-open { opacity: 1; }

.panel-handle { display: none; }

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.panel-heading h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 430;
  letter-spacing: -.025em;
}

.quiet-button {
  padding: 7px 10px;
  border-color: transparent;
  border-radius: 999px;
  color: rgba(220, 231, 232, .5);
  font-size: 11px;
}

.statement {
  margin: 28px 0;
  color: rgba(220, 231, 232, .68);
  font-size: 14px;
  line-height: 1.85;
}

.instructions {
  margin: 0;
  border-top: 1px solid rgba(220, 231, 232, .09);
}

.instructions div {
  display: grid;
  grid-template-columns: 72px 1fr;
  padding: 14px 0;
  border-bottom: 1px solid rgba(220, 231, 232, .09);
}

.instructions dt {
  color: rgba(154, 220, 224, .72);
  font-size: 12px;
  letter-spacing: .04em;
}

.instructions dd {
  margin: 0;
  color: rgba(220, 231, 232, .55);
  font-size: 12px;
}

.panel-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 24px;
}

.action-button {
  min-height: 44px;
  border-radius: 999px;
  font-size: 12px;
  transition: background-color .35s ease, border-color .35s ease;
}

.action-button:hover {
  border-color: rgba(154, 220, 224, .25);
  background: rgba(25, 34, 43, .52);
}

.keyboard-note {
  margin: 18px 0 0;
  color: rgba(220, 231, 232, .3);
  font-size: 10px;
  line-height: 1.5;
  text-align: center;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (max-width: 640px), (orientation: portrait) and (max-width: 900px) {
  .info-panel {
    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    max-height: min(72vh, 680px);
    padding: 14px max(22px, env(safe-area-inset-right))
      calc(22px + env(safe-area-inset-bottom)) max(22px, env(safe-area-inset-left));
    transform: translateY(24px);
    border-width: 1px 0 0;
    border-radius: 28px 28px 0 0;
  }

  .info-panel.is-open { transform: translateY(0); }
  .panel-handle {
    display: block;
    width: 38px;
    height: 4px;
    margin: 0 auto 20px;
    border-radius: 99px;
    background: rgba(220, 231, 232, .18);
  }
}

@media (prefers-reduced-motion: reduce) {
  .info-panel,
  .panel-backdrop { transition-duration: .18s; }
}