/* =========================================================================
   Chat selection toolbar — DS-4 production migration
   Extracted from workspace-redesign/chat-selection/current/sketches/chat-selection-toolbar-final
   Tokens used: --ink-100, --ink-900, --ink-1000, --bg-1, --fg-1, --fg-2,
                --ember-400, --ember-500, --line-2, --paper, --font-sans,
                --weight-medium, --ease-out-soft, --ease-standard
   All colors via color-mix(in oklch, var(--TOKEN) X%, transparent) — no raw hex.
   ========================================================================= */

/* Warm 4-layer shadow recipe (dark theme default) */
:root {
  --shadow-csa-1:
    inset 0 0.5px 0 color-mix(in oklch, white 35%, transparent),
    0 1px 2px color-mix(in oklch, var(--ink-1000) 18%, transparent),
    0 4px 14px -2px color-mix(in oklch, var(--ink-1000) 22%, transparent),
    0 14px 32px -16px color-mix(in oklch, var(--ink-1000) 32%, transparent);
}
[data-theme="light"] {
  --shadow-csa-1:
    inset 0 0.5px 0 color-mix(in oklch, white 60%, transparent),
    0 1px 2px color-mix(in oklch, var(--ink-900) 8%, transparent),
    0 4px 14px -2px color-mix(in oklch, var(--ink-900) 10%, transparent),
    0 14px 32px -16px color-mix(in oklch, var(--ink-900) 14%, transparent);
}

/* =========================================================================
   Animations
   ========================================================================= */
@keyframes csa-in-from-top {
  from { opacity: 0; transform: translate(-50%, 2px) scale(0.985); }
  to   { opacity: 1; transform: translate(-50%, 0)   scale(1); }
}
@keyframes csa-in-from-bottom {
  from { opacity: 0; transform: translate(-50%, -2px) scale(0.985); }
  to   { opacity: 1; transform: translate(-50%, 0)    scale(1); }
}
@keyframes csa-in-cursor {
  from { opacity: 0; transform: translateY(2px) scale(0.985); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}
@keyframes csa-out {
  from { opacity: 1; }
  to   { opacity: 0; }
}
@keyframes csa-ember-flash {
  0%   { color: var(--ember-400); }
  100% { color: var(--fg-1); }
}

/* =========================================================================
   Toolbar container
   ========================================================================= */
.csa-root {
  position: fixed;
  z-index: 230;
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding: 3px;
  border-radius: 999px;
  border: 1px solid color-mix(in oklch, var(--ink-100) 7%, transparent);
  background: color-mix(in oklch, var(--bg-1) 95%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(135%);
  backdrop-filter: blur(18px) saturate(135%);
  box-shadow: var(--shadow-csa-1);
  user-select: none;
  white-space: nowrap;
  font-family: var(--font-sans);
  will-change: transform, opacity;
}
[data-theme="light"] .csa-root {
  border: 1px solid color-mix(in oklch, var(--ink-900) 6%, transparent);
  background: color-mix(in oklch, var(--paper) 95%, transparent);
}

.csa-root[data-anchor="selection-top"] {
  transform: translate(-50%, 0);
  transform-origin: center bottom;
  animation: csa-in-from-top 180ms cubic-bezier(0.32, 0.72, 0, 1) both;
}
.csa-root[data-anchor="selection-bottom"] {
  transform: translate(-50%, 0);
  transform-origin: center top;
  animation: csa-in-from-bottom 180ms cubic-bezier(0.32, 0.72, 0, 1) both;
}
.csa-root[data-anchor="cursor-bottom"] {
  transform-origin: top left;
  animation: csa-in-cursor 180ms cubic-bezier(0.32, 0.72, 0, 1) both;
}
.csa-root[data-anchor="cursor-top"] {
  transform-origin: bottom left;
  animation: csa-in-cursor 180ms cubic-bezier(0.32, 0.72, 0, 1) both;
}
.csa-root[data-leaving="true"] {
  animation: csa-out 100ms linear forwards;
}

/* =========================================================================
   Buttons (icon-only 28×28)
   ========================================================================= */
.csa-btn {
  appearance: none;
  background: transparent;
  border: 0;
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-2);
  cursor: pointer;
  transition:
    color 120ms cubic-bezier(0.2, 0, 0, 1),
    background 120ms cubic-bezier(0.2, 0, 0, 1),
    transform 100ms cubic-bezier(0.2, 0, 0, 1);
  -webkit-tap-highlight-color: transparent;
}
.csa-btn:hover {
  background: color-mix(in oklch, var(--ink-100) 5%, transparent);
  color: var(--fg-1);
}
.csa-btn:active {
  transform: scale(0.97);
  background: color-mix(in oklch, var(--ink-100) 8%, transparent);
}
[data-theme="light"] .csa-btn:hover {
  background: color-mix(in oklch, var(--ink-900) 5%, transparent);
}
[data-theme="light"] .csa-btn:active {
  background: color-mix(in oklch, var(--ink-900) 8%, transparent);
}

.csa-btn[data-flash="true"] {
  animation: csa-ember-flash 700ms cubic-bezier(0.32, 0.72, 0, 1);
}
.csa-btn[data-flash="true"] .csa-icon {
  animation: csa-ember-flash 700ms cubic-bezier(0.32, 0.72, 0, 1);
}
.csa-btn[data-tone="danger"] {
  color: color-mix(in oklch, var(--fg-2) 82%, var(--ember-500));
}
.csa-btn[data-tone="danger"]:hover {
  background: color-mix(in oklch, var(--ember-500) 9%, transparent);
  color: var(--ember-400);
}

/* =========================================================================
   Icon wrapper + layered (copy ↔ check) icons
   ========================================================================= */
.csa-icon {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  color: currentColor;
}
.csa-icon svg { display: block; }

.csa-icon-layer {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transition:
    opacity 160ms cubic-bezier(0.32, 0.72, 0, 1),
    transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
}
.csa-icon-copy  { opacity: 1; transform: scale(1); }
.csa-icon-check { opacity: 0; transform: scale(0.55); color: var(--ember-500); }

.csa-btn[data-copied="true"] .csa-icon-copy  { opacity: 0; transform: scale(0.55); }
.csa-btn[data-copied="true"] .csa-icon-check { opacity: 1; transform: scale(1); }
[data-theme="light"] .csa-icon-check { color: var(--ember-600, var(--ember-500)); }

/* =========================================================================
   Hairline divider between actions
   ========================================================================= */
.csa-divider {
  width: 1px;
  height: 14px;
  margin: 0 1px;
  background: color-mix(in oklch, var(--ink-100) 10%, transparent);
  flex: 0 0 auto;
  pointer-events: none;
  align-self: center;
}
[data-theme="light"] .csa-divider {
  background: color-mix(in oklch, var(--ink-900) 10%, transparent);
}

/* =========================================================================
   Toast (used for Quote action where toolbar disappears)
   ========================================================================= */
@keyframes csa-toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
@keyframes csa-toast-out {
  from { opacity: 1; transform: translateX(-50%) translateY(0); }
  to   { opacity: 0; transform: translateX(-50%) translateY(8px); }
}
.csa-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  z-index: 300;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  background: color-mix(in oklch, var(--ink-900) 92%, transparent);
  border: 1px solid var(--line-2);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  color: var(--fg-1);
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: -0.005em;
  box-shadow: var(--shadow-csa-1);
  pointer-events: none;
}
.csa-toast[data-state="entering"] { animation: csa-toast-in 180ms cubic-bezier(0.2, 0, 0, 1) both; }
.csa-toast[data-state="leaving"]  { animation: csa-toast-out 220ms cubic-bezier(0.2, 0, 0, 1) both; }
[data-theme="light"] .csa-toast {
  background: color-mix(in oklch, var(--paper) 92%, transparent);
  color: var(--ink-950);
}
.csa-toast-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--ember-500);
  box-shadow: 0 0 8px -1px color-mix(in oklch, var(--ember-500) 60%, transparent);
}

/* =========================================================================
   Mobile fallthrough — touch devices use native callout
   ========================================================================= */
@media (pointer: coarse) {
  .csa-root, .csa-toast { display: none !important; }
}

/* =========================================================================
   Reduced motion
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
  .csa-root,
  .csa-root[data-anchor="selection-top"],
  .csa-root[data-anchor="selection-bottom"],
  .csa-root[data-anchor="cursor-bottom"],
  .csa-root[data-anchor="cursor-top"],
  .csa-root[data-leaving="true"],
  .csa-toast,
  .csa-btn,
  .csa-btn[data-flash="true"],
  .csa-btn[data-flash="true"] .csa-icon,
  .csa-icon-layer {
    animation: none !important;
    transition-duration: 80ms !important;
    transition-timing-function: linear !important;
  }
}