/* File preview pane — split from files.css (X4 source-size gate). */
.file-preview-pane {
  min-width: 12.5rem;
  min-height: 0;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--ui-panel);
}

.file-preview-tabs {
  /* T315: match path-row height (previously ~2× taller). */
  min-width: 0;
  min-height: var(--files-path-row-height);
  flex: 0 0 var(--files-path-row-height);
  display: flex;
  align-items: stretch;
  gap: 0;
  overflow-x: auto;
  overflow-y: hidden;
  border-bottom: 1px solid var(--ui-line);
  background: var(--ui-bg);
  scrollbar-width: thin;
}

.file-preview-tabs[hidden] {
  display: none;
}

.file-preview-tab {
  /* T268: JS layoutFilePreviewTabs sets flex-basis from strip width ÷ count. */
  min-width: 7rem;
  max-width: 10rem;
  flex: 1 1 0;
  display: flex;
  align-items: center;
  border-right: 1px solid var(--ui-line);
  background: transparent;
  color: var(--ui-muted);
  box-sizing: border-box;
}

.file-preview-tab.active {
  box-shadow: inset 0 2px var(--ui-accent);
  background: var(--ui-panel);
  color: var(--ui-text);
}

.file-preview-tab-button {
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
  /* T315: shrink vertical padding to fit --files-path-row-height. */
  padding: 0.2rem 0.2rem 0.2rem 0.55rem;
  border: 0;
  background: transparent;
  color: inherit;
  font: 500 0.75rem/1 ui-monospace, Menlo, monospace;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-preview-tab-close {
  position: relative;
  width: 1.25rem;
  height: 1.25rem;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  margin-inline: 0.15rem;
  padding: 0;
  border: 0;
  border-radius: 0.25rem;
  background: transparent;
  color: var(--ui-muted);
}

.file-preview-tab-close:hover {
  background: var(--ui-hover);
  color: var(--ui-text);
}

.file-preview-tab-button:focus-visible,
.file-preview-tab-close:focus-visible {
  position: relative;
  z-index: 1;
  outline: 2px solid var(--ui-accent);
  outline-offset: -2px;
}

.file-preview-header {
  min-height: var(--files-path-row-height);
  flex: 0 0 var(--files-path-row-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  padding: 0.25rem 0.65rem;
  border-bottom: 1px solid var(--ui-line);
  background: var(--ui-panel);
  box-sizing: border-box;
}

.file-preview-title-row {
  min-width: 0;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.file-preview-breadcrumb {
  min-width: 0;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 0.2rem;
  overflow-x: auto;
  overflow-y: hidden;
  color: var(--ui-text-soft);
  font: 500 0.7rem/1.35 ui-monospace, Menlo, monospace;
  white-space: nowrap;
  scrollbar-width: none;
}

.file-preview-breadcrumb::before {
  content: "Workspace /";
  flex: 0 0 auto;
  color: var(--ui-accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.file-preview-breadcrumb::-webkit-scrollbar {
  display: none;
}

.file-breadcrumb-item {
  min-width: 0;
  flex: 0 0 auto;
  padding: 0.2rem;
  border: 0;
  border-radius: 0.22rem;
  background: transparent;
  color: var(--ui-muted);
  font: inherit;
  white-space: nowrap;
}

.file-breadcrumb-item:hover,
.file-breadcrumb-item:focus-visible {
  background: var(--ui-accent-soft);
  color: var(--ui-text);
}

.file-breadcrumb-item:last-of-type {
  color: var(--ui-text-soft);
}

.file-breadcrumb-separator,
.file-breadcrumb-empty {
  color: var(--ui-muted);
}

.file-copy-path {
  width: 1.75rem;
  height: 1.75rem;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  padding: 0;
}

.file-sensitive,
.file-language {
  flex: 0 0 auto;
  border: 1px solid var(--ui-line);
  background: var(--ui-bg);
  color: var(--ui-muted);
  font-size: 0.7rem;
}

.file-sensitive {
  border-color: color-mix(in srgb, var(--ui-warning) 45%, var(--ui-line));
  color: var(--ui-warning);
}

.file-preview-actions {
  min-width: 0;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.file-preview-details {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--ui-muted);
  font: 0.68rem/1 ui-monospace, Menlo, monospace;
  white-space: nowrap;
}

.file-preview-lines::before {
  content: "·";
  margin-right: 0.4rem;
}

.file-action {
  width: auto;
  min-height: 1.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.3rem 0.45rem;
  color: var(--ui-text-soft);
  font-size: 0.75rem;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.file-action-icon {
  color: var(--ui-muted);
  font-size: 0.85rem;
}

.file-exit-full-view {
  display: none;
}

.file-focused-dock-open {
  display: inline-flex;
}

.file-preview-body {
  width: 100%;
  min-height: 0;
  flex: 1 1 auto;
  overflow: auto;
  padding: clamp(1.5rem, 3.5vw, 3rem);
  background: var(--ui-panel);
}

.file-preview-error {
  display: grid;
  place-items: center;
  text-align: center;
}

.file-preview-error-card {
  width: min(100%, 30rem);
  padding: 1.5rem;
  border: 1px solid var(--ui-line);
  border-radius: 0.65rem;
  background: var(--ui-raised);
  color: var(--ui-text-soft);
}

.file-preview-error-card strong {
  display: block;
  color: var(--ui-text);
  font-size: 1rem;
}

.file-preview-error-card p {
  margin: 0.55rem 0 1rem;
}

.file-preview-error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.file-preview-error-status {
  flex-basis: 100%;
  color: var(--ui-muted);
  font-size: 0.75rem;
}

.file-preview-body .markdown-preview {
  max-width: 48rem;
  margin-inline: auto;
  color: var(--ui-text-soft);
  font-size: 0.9rem;
  line-height: 1.65;
}

.file-preview-body .markdown-preview h1 {
  max-width: 24ch;
  margin-block: 0 1rem;
  color: var(--ui-text);
  font-size: clamp(1.8rem, 3.25vw, 2.7rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.file-preview-body .markdown-preview :is(h2, h3) {
  margin-block: 1.5rem 0.6rem;
  color: var(--ui-text);
  line-height: 1.2;
}

.file-preview-body .markdown-preview h2 {
  font-size: 1.35rem;
}

.file-preview-body .markdown-preview h3 {
  font-size: 1rem;
}

.file-preview-body .markdown-preview :is(p, li) {
  color: var(--ui-text-soft);
}

.files-toast {
  margin: 0.3rem 0.5rem;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--ui-line);
  border-radius: 0.4rem;
  background: var(--ui-raised);
  color: var(--ui-text-soft);
  font-size: 0.75rem;
}

.files-toast:empty {
  display: none;
}

.files-toast.success,
.files-toast-message.success {
  border-color: color-mix(in srgb, var(--ui-success) 45%, transparent);
  color: var(--ui-success);
}

.files-toast.error,
.files-toast-message.error {
  border-color: color-mix(in srgb, var(--ui-danger) 45%, transparent);
  color: var(--ui-danger);
}

.files-toast.batch {
  border: 0;
  padding: 0;
  background: transparent;
}

.files-toast-message {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--ui-line);
  border-radius: 0.4rem;
  background: var(--ui-raised);
}

.files-toast-message + .files-toast-message {
  margin-top: 0.35rem;
}

body.standalone-file > #files-legacy-tab {
  width:100vw; height:100dvh; min-height:0; display:flex; overflow:hidden; padding:0;
}
body.standalone-file .files-pane {
  min-height:0; flex:1 1 auto; border:0; border-radius:0; box-shadow:none;
}
body.standalone-file .files-tree-pane,
body.standalone-file .panel-divider,
body.standalone-file .file-preview-tabs { display:none; }
body.standalone-file > #files-legacy-tab > .section-header {
  display:none;
}
body.standalone-file :is(.file-exit-full-view, .file-focused-dock-open) {
  display:inline-flex;
}
body.standalone-file .file-preview-header {
  padding-inline:.85rem;
}
body.standalone-file .file-preview-body { padding:clamp(1.5rem,4vw,4rem); }
body.standalone-file .agent-dock { top:0; }
body.standalone-file.dock-open > #files-legacy-tab {
  width:calc(100vw - var(--agent-dock-width)); margin-right:var(--agent-dock-width);
}

@media (max-width:820px) {
  /* T319: phone Files is a navigation stack (list XOR full-screen preview). */
  .files-split.files-phone-stack {
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
  }
  .files-split.files-phone-stack:not(.files-phone-previewing) #file-preview-pane {
    display: none;
  }
  .files-split.files-phone-stack.files-phone-previewing #files-tree-pane,
  .files-split.files-phone-stack.files-phone-previewing #files-divider {
    display: none;
  }
  .files-split.files-phone-stack.files-phone-previewing #file-preview-pane {
    display: flex;
    flex: 1 1 auto;
    width: 100%;
    max-width: none;
    min-height: 0;
  }
  /* Fallback when stack class not yet applied: still avoid side-by-side. */
  .files-split:not(.files-phone-stack) {
    display:grid; grid-template-rows:minmax(12rem,38vh) minmax(20rem,1fr);
  }
  .files-tree-pane {
    width:100%; max-width:none; border-bottom:1px solid var(--ui-line);
    flex: 1 1 auto;
    min-height: 0;
  }
  #files-divider { display:none; }
  .files-tree-toolbar { grid-template-columns:minmax(0,1fr); }
  .files-tree-controls { overflow-x:auto; }
  .files-tree-control {
    width:auto; min-width:max-content; height:2.25rem; flex:0 0 auto;
  }
  /* T319: open-tabs row hidden — stack replaces the tab metaphor on phone. */
  .file-preview-tabs {
    display: none !important;
  }
  /* T315: keep path row at the shared token height (no stack growth). */
  .file-preview-header {
    min-height: var(--files-path-row-height);
    flex: 0 0 var(--files-path-row-height);
  }
  .files-phone-back {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    flex: 0 0 auto;
    margin-right: 0.15rem;
    font-size: 1.1rem;
    line-height: 1;
  }
  body:not(.files-phone-active) .files-phone-back,
  .files-split:not(.files-phone-previewing) .files-phone-back {
    display: none;
  }
  .files-split.files-phone-previewing .files-phone-back {
    display: inline-flex;
  }
  /* Phone preview chrome: fit the 44px back + safe-area (T315 token stays
     desktop path-row height; phone stack may grow the chrome, not the IA). */
  .files-split.files-phone-stack.files-phone-previewing .file-preview-header {
    min-height: max(44px, var(--files-path-row-height));
    flex: 0 0 auto;
    padding-top: max(0.25rem, env(safe-area-inset-top, 0px));
    padding-right: max(0.55rem, env(safe-area-inset-right, 0px));
    padding-bottom: 0.25rem;
    padding-left: max(0.55rem, env(safe-area-inset-left, 0px));
    box-sizing: border-box;
    gap: 0.25rem;
  }
  /* T312 law: 44px hit without growing the visual tab row. */
  .file-preview-tab-close::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 44px;
    height: 44px;
    transform: translate(-50%, -50%);
  }
  .file-preview-actions { min-width:0; flex:0 1 auto; overflow-x:auto; }
  .file-preview-details { margin-right:auto; }
  .file-action-label {
    position:absolute !important; width:1px; height:1px; overflow:hidden;
    clip:rect(0,0,0,0); white-space:nowrap;
  }
  /* Was 2.25rem (36px) — under the mobile-first 44px floor. */
  .file-action,
  .file-preview-actions .file-action,
  .file-preview-actions #file-open-raw,
  .file-preview-actions #file-full-view,
  .file-preview-actions #file-copy-path,
  .file-preview-actions #file-focused-dock-open,
  .file-preview-actions #file-exit-full-view {
    width: auto;
    height: auto;
    min-width: 44px;
    min-height: 44px;
    padding: 0.35rem;
    box-sizing: border-box;
  }
  .files-split.files-phone-stack .file-preview-body,
  .files-split.files-phone-stack .file-preview-empty {
    max-width: 100%;
    box-sizing: border-box;
    overflow-x: hidden;
    padding-top: max(1rem, env(safe-area-inset-top, 0px));
    padding-right: max(1rem, env(safe-area-inset-right, 0px));
    padding-bottom: max(1rem, env(safe-area-inset-bottom, 0px));
    padding-left: max(1rem, env(safe-area-inset-left, 0px));
  }
  body.standalone-file .file-preview-header {
    display:flex; grid-template-columns:none;
  }
  body.standalone-file .file-preview-title-row {
    min-width:0; flex:1 1 auto;
  }
  body.standalone-file .file-preview-actions {
    width:auto; flex:0 0 auto; overflow-x:visible;
  }
  body.standalone-file.dock-open > #files-legacy-tab {
    width:100vw; height:52vh; min-height:52vh; margin-right:0; padding-bottom:0; }
  body.standalone-file.dock-open .files-pane { min-height:52vh; }
  body.standalone-file .files-split { display:flex; }
  body.standalone-file .agent-dock {
    top:52vh; height:48vh; min-height:20rem; border-top:1px solid var(--ui-line); }
}
@media (max-width:480px) {
  .files-heading-copy { width:100%; }
  .files-actions { width:100%; justify-content:flex-end; }
  .files-actions .button {
    min-height:44px; padding-inline:.65rem; font-size:.75rem;
  }
  .file-time { display:none; }
}

/* T373: PDF.js owns its scroll viewport; generic document padding must not
   reserve width or height around the fitted canvases in any Files layout. */
.file-preview-body.pdf-preview-host,
body.standalone-file .file-preview-body.pdf-preview-host,
.files-split.files-phone-stack .file-preview-body.pdf-preview-host {
  padding: 0;
}
@media (prefers-reduced-motion:reduce) {
  .files-search-spinner,
  .file-node.file-reveal-flash > .file-entry-row { animation:none; }
}