/* Core button timing, press scale, elevation and focus tokens are taken from
   https://oklch.fyi/_next/static/immutable/chunks/01m3164atnos0.css
   Mobile selection motion adapts the sliding tabs at transitions.dev/library.html. */
:root {
  --feedback-duration: 150ms;
  --feedback-ease: cubic-bezier(0, 0, .2, 1);
  /* animations.dev's interactive Paste demo: 150ms, 0.97 scale, default ease. */
  --press-ease: cubic-bezier(.4, 0, .2, 1);
  --move-ease: cubic-bezier(.32, .72, 0, 1);
  --elevation-raised: 0 0 0 1px color-mix(in srgb, var(--color-black) 5.88%, transparent), 0 1px 2px -1px color-mix(in srgb, var(--color-black) 5.88%, transparent), 0 2px 4px color-mix(in srgb, var(--color-black) 3.92%, transparent);
  --elevation-raised-hover: 0 0 0 1px color-mix(in srgb, var(--color-black) 7.84%, transparent), 0 1px 2px -1px color-mix(in srgb, var(--color-black) 7.84%, transparent), 0 2px 4px color-mix(in srgb, var(--color-black) 5.88%, transparent);
  --elevation-focus: 0 0 0 3px color-mix(in srgb, var(--color-black) 7.84%, transparent);
}

:is(button, .tool-nav a) {
  -webkit-user-select: none;
  user-select: none;
  transition-property: color, background-color, border-color, box-shadow, opacity, scale;
  transition-duration: var(--feedback-duration);
  transition-timing-function: var(--press-ease);
  transform-origin: center;
  scale: 1;
}
:is(button, .tool-nav a):active:not(:disabled):not([aria-disabled="true"]) {
  scale: .97;
}
button:disabled { pointer-events: none; scale: 1; }

/* animations.dev .buy-button: same gradient, four shadow layers and hover filter,
   with its yellow surface/rim remapped to charcoal. Keep our control sizing. */
.primary, .play-button {
  background: linear-gradient(var(--color-neutral-700) 0%, var(--color-neutral-800) 100%);
  box-shadow: inset 0 0 1px 1px color-mix(in srgb, var(--color-white) 14%, transparent),
    0 0 0 1px color-mix(in srgb, var(--color-black) 8%, transparent), 0 2px 2px color-mix(in srgb, var(--color-black) 4%, transparent),
    0 0 0 1px var(--color-neutral-800);
  text-shadow: 0 .5px color-mix(in srgb, var(--color-black) 32%, transparent);
  transition-property: color, background-color, border-color, box-shadow, opacity, scale, filter;
  transition-duration: 150ms, 150ms, 150ms, 150ms, 150ms, 150ms, 200ms;
  transition-timing-function: var(--press-ease), var(--press-ease), var(--press-ease), var(--press-ease), var(--press-ease), var(--press-ease), ease;
}
.secondary, .icon-button, .sm button {
  box-shadow: var(--elevation-raised);
}

.tool-nav .ui-icon { transition: opacity var(--feedback-duration) var(--feedback-ease); }

button:focus-visible, a:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--color-neutral-600);
  outline-offset: 2px;
}
/* Route headings receive focus for screen readers, but are not interactive controls. */
#main h1[tabindex="-1"]:focus { outline: none; }
:is(.secondary, .icon-button, .sm button):focus-visible {
  border-color: var(--color-neutral-300);
  box-shadow: var(--elevation-focus);
}
.sm button {
  --elevation-filled: inset 0 1px 0 color-mix(in srgb, var(--color-white) 14.90%, transparent), 0 0 0 1px var(--mix-rim), 0 1px 2px color-mix(in srgb, var(--color-black) 7.84%, transparent), 0 2px 4px color-mix(in srgb, var(--color-black) 7.84%, transparent);
  --elevation-filled-hover: inset 0 1px 0 color-mix(in srgb, var(--color-white) 20.00%, transparent), 0 0 0 1px var(--mix-rim), 0 2px 3px color-mix(in srgb, var(--color-black) 9.41%, transparent), 0 3px 6px color-mix(in srgb, var(--color-black) 7.84%, transparent);
}
.sm button[aria-pressed="true"] { box-shadow: var(--elevation-filled); }
.dropzone {
  transition: background-color 150ms var(--feedback-ease), border-color 150ms var(--feedback-ease), box-shadow 150ms var(--feedback-ease);
}
.dropzone:focus-within {
  border-color: var(--color-neutral-300);
  box-shadow: var(--elevation-focus);
}
.dropzone.dragging { border-color: var(--color-neutral-400); background: var(--color-neutral-50); box-shadow: var(--elevation-focus); }

@media (hover: hover) and (pointer: fine) {
  .secondary:hover:not(:disabled), .icon-button:hover, .sm button:hover:not([aria-pressed="true"]) {
    background: var(--color-neutral-50);
    box-shadow: var(--elevation-raised-hover);
  }
  :is(.primary, .play-button):hover:not(:disabled) { filter: brightness(105%); }
  .sm button[aria-pressed="true"]:hover:not(:disabled) { box-shadow: var(--elevation-filled-hover); }
  .text-button:hover { background: var(--color-neutral-100); color: var(--color-neutral-800); }
  .sidebar-bottom button:hover { background: var(--color-neutral-100); color: var(--color-neutral-800); }
  .dropzone:hover { border-color: var(--color-neutral-300); box-shadow: var(--elevation-raised-hover); }
  .tool-nav a:hover { color: var(--color-neutral-800); }
  .tool-nav a:hover .ui-icon { opacity: 1; }
}
/* Inherited mix states share filled elevation, with a softer tonal surface/rim.
   Keyboard focus keeps its separate outline; explicit toggles stay saturated. */
.sm button[data-state="indirect"][aria-pressed="false"],
.sm button[data-state="context"][aria-pressed="false"] {
  background: var(--mix-weak-bg);
  box-shadow: var(--elevation-filled);
}
@media (hover: hover) and (pointer: fine) {
  .sm button[data-state="indirect"][aria-pressed="false"]:hover:not(:disabled),
  .sm button[data-state="context"][aria-pressed="false"]:hover:not(:disabled) {
    background: var(--mix-weak-hover);
    box-shadow: var(--elevation-filled-hover);
  }
}
@media (min-width: 768px) and (hover: hover) and (pointer: fine) {
  .tool-nav a:hover { background: var(--color-neutral-100); }
}

/* A single mobile selection surface retargets smoothly on rapid tab changes. */
@media (max-width: 767px) {
  .tool-nav {
    --nav-inset-left: max(12px, env(safe-area-inset-left, 0px));
    --nav-inset-right: max(12px, env(safe-area-inset-right, 0px));
    isolation: isolate;
  }
  .tool-nav::before {
    content: "";
    position: absolute;
    z-index: -1;
    left: var(--nav-inset-left);
    top: 6px;
    width: calc((100% - var(--nav-inset-left) - var(--nav-inset-right) - 8px) / 3);
    height: 51px;
    border-radius: 8px;
    background: var(--color-neutral-100);
    transform: translateX(calc(var(--tab-index, 0) * (100% + 4px)));
    transition: transform 180ms var(--move-ease);
    pointer-events: none;
  }
  .tool-nav a[aria-current], .tool-nav a:active { background: transparent; }
}

/* Tooltips keep the exact chord/time geometry; only their own overlay moves. */
.chord::after {
  content: attr(data-label);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translate(-50%, 2px) scale(.98);
  opacity: 0;
  background: var(--color-neutral-800);
  color: var(--color-white);
  border-radius: 5px;
  padding: 6px 9px;
  font-size: 13px;
  white-space: nowrap;
  pointer-events: none;
  transition: opacity 125ms var(--feedback-ease), transform 125ms var(--feedback-ease);
}
.chord:focus-visible { overflow: visible; z-index: 7; }
.chord:focus-visible::after { opacity: 1; transform: translate(-50%, 0); }
@media (hover: hover) and (pointer: fine) {
  .chord:hover { overflow: visible; z-index: 7; }
  .chord:hover::after {
    opacity: 1;
    transform: translate(-50%, 0);
    transition-delay: 180ms;
  }
}
.chord-label { overflow: hidden; }
/* Keep transport and model timing literal: never tween the playhead or seek. */
.playhead, .slider-fill, .slider-thumb { scale: 1; transition: none; }

/* Native dialog handles focus/Escape; discrete CSS transitions retain that behavior. */
dialog {
  opacity: 0;
  transform: translateY(6px) scale(.98);
  transition: opacity 180ms var(--feedback-ease), transform 180ms var(--feedback-ease), display 180ms allow-discrete, overlay 180ms allow-discrete;
}
dialog[open] { opacity: 1; transform: none; }
dialog::backdrop { opacity: 0; transition: opacity 180ms var(--feedback-ease), display 180ms allow-discrete, overlay 180ms allow-discrete; }
dialog[open]::backdrop { opacity: 1; }
.toast { opacity: 1; translate: 0 0; transition: opacity 150ms var(--feedback-ease), translate 150ms var(--feedback-ease); }
.toast[data-leaving] { opacity: 0; translate: 0 4px; }
@starting-style {
  dialog[open] { opacity: 0; transform: translateY(6px) scale(.98); }
  dialog[open]::backdrop { opacity: 0; }
  .toast { opacity: 0; translate: 0 6px; }
}

/* Keyboard changes are immediate. Reduced motion preserves color/state feedback. */
:root[data-input-mode="keyboard"] *,
:root[data-input-mode="keyboard"] *::before,
:root[data-input-mode="keyboard"] *::after,
:root[data-input-mode="keyboard"] dialog::backdrop { transition-duration: 0s !important; transition-delay: 0s !important; }
:root[data-input-mode="keyboard"] :is(button, .tool-nav a):active { scale: 1; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after, dialog::backdrop { transition: none !important; animation: none !important; }
  :is(button, .tool-nav a):active { scale: 1 !important; }
  dialog, dialog[open] { transform: none; }
  .toast, .toast[data-leaving] { translate: none; }
}