@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&family=Syne:wght@400;700;800&display=swap');

/* ── VARIABLES ── */
:root {
  --bg-deep:       #0d0f11;
  --bg-panel:      #131619;
  --bg-editor:     #0f1214;
  --bg-header:     #171b1f;
  --bg-gutter:     #151821;
  --border:        #252b33;
  --border-light:  #2e3640;
  --text-main:     #cdd3db;
  --text-dim:      #5a6472;
  --text-label:    #8993a0;
  --accent-cyan:   #3ecfcf;
  --accent-orange: #f0843a;
  --diff-add-bg:   #0d2318;
  --diff-add-hl:   #1a4a2e;
  --diff-add-bar:  #2ea86e;
  --diff-del-bg:   #2a0d0d;
  --diff-del-hl:   #4a1a1a;
  --diff-del-bar:  #d95f5f;
  --diff-mod-bg:   #1a1a0d;
  --diff-mod-hl:   #3a3a14;
  --diff-mod-bar:  #c9b23a;
  --nav-active:    #1e2630;
}

/* ── RESET & BASE ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  overflow: hidden;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-panel); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }

input[type=file] { display: none; }

/* ── APP SHELL ── */
#app {
  display: grid;
  grid-template-rows: 48px 40px 1fr 30px;
  grid-template-columns: 220px 1fr;
  height: 100dvh;
  grid-template-areas:
    "titlebar titlebar"
    "toolbar  toolbar"
    "sidebar  main"
    "status   status";
}

/* ── TITLE BAR ── */
#titlebar {
  grid-area: titlebar;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 12px;
}

.logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.5px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo-icon {
  width: 24px;
  height: 24px;
  background: var(--accent-cyan);
  border-radius: 4px;
  display: grid;
  place-items: center;
  font-size: 13px;
  color: #0d0f11;
  font-weight: 800;
}

.title-sep { width: 1px; height: 18px; background: var(--border); flex-shrink: 0; }

.diff-stats { display: flex; gap: 8px; align-items: center; margin-left: auto; }

.stat-pill {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 3px;
  font-size: 10px;
  font-weight: 500;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
}
.stat-pill .dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.stat-pill.add { color: var(--diff-add-bar); border-color: rgba(46,168,110,0.3); }
.stat-pill.add .dot { background: var(--diff-add-bar); }
.stat-pill.del { color: var(--diff-del-bar); border-color: rgba(217,95,95,0.3); }
.stat-pill.del .dot { background: var(--diff-del-bar); }
.stat-pill.mod { color: var(--diff-mod-bar); border-color: rgba(201,178,58,0.3); }
.stat-pill.mod .dot { background: var(--diff-mod-bar); }
.stat-label { display: inline; }

/* Sidebar toggle (shown on mobile) */
#sidebar-toggle {
  display: none;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-label);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
#sidebar-toggle svg { width: 16px; height: 16px; }

/* ── TOOLBAR ── */
#toolbar {
  grid-area: toolbar;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 10px;
  gap: 3px;
  overflow-x: auto;
  overflow-y: hidden;
}
#toolbar::-webkit-scrollbar { height: 0; }

.tb-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: 3px;
  border: none;
  background: transparent;
  color: var(--text-label);
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  transition: all 0.12s;
  white-space: nowrap;
  flex-shrink: 0;
}
.tb-btn:hover { background: rgba(255,255,255,0.06); color: var(--text-main); }
.tb-btn.active { background: var(--nav-active); color: var(--accent-cyan); }
.tb-btn svg { width: 13px; height: 13px; flex-shrink: 0; }

.tb-sep {
  width: 1px;
  height: 18px;
  background: var(--border);
  margin: 0 3px;
  flex-shrink: 0;
}

.view-toggle {
  margin-left: auto;
  display: flex;
  flex-shrink: 0;
  background: var(--bg-editor);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.view-btn {
  padding: 5px 11px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  transition: all 0.12s;
}
.view-btn.active { background: var(--nav-active); color: var(--accent-cyan); }

/* ── SIDEBAR ── */
#sidebar {
  grid-area: sidebar;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: transform 0.22s ease;
}

.sidebar-title {
  padding: 8px 12px 6px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.sidebar-count {
  background: var(--bg-editor);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1px 7px;
  font-size: 10px;
  color: var(--text-label);
}

.diff-nav-list { list-style: none; padding: 4px 0 8px; }

.diff-nav-item {
  display: flex;
  align-items: center;
  cursor: pointer;
  transition: background 0.1s;
  border-left: 2px solid transparent;
  min-height: 44px;
}
.diff-nav-item:hover,
.diff-nav-item:active { background: rgba(255,255,255,0.05); }
.diff-nav-item.active { background: var(--nav-active); }
.diff-nav-item.active.type-ins { border-left-color: var(--diff-add-bar); }
.diff-nav-item.active.type-del { border-left-color: var(--diff-del-bar); }
.diff-nav-item.active.type-mod { border-left-color: var(--diff-mod-bar); }

.diff-type-bar { width: 3px; align-self: stretch; flex-shrink: 0; margin-right: 8px; }
.type-ins .diff-type-bar { background: var(--diff-add-bar); opacity: 0.5; }
.type-del .diff-type-bar { background: var(--diff-del-bar); opacity: 0.5; }
.type-mod .diff-type-bar { background: var(--diff-mod-bar); opacity: 0.5; }
.diff-nav-item.active .diff-type-bar { opacity: 1; }

.diff-nav-content { padding: 6px 8px 6px 0; flex: 1; min-width: 0; }
.diff-nav-line { font-size: 10px; color: var(--text-dim); margin-bottom: 2px; }
.diff-nav-preview {
  font-size: 11px;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 155px;
}

.diff-type-badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 1px 5px;
  border-radius: 2px;
  margin-right: 8px;
  flex-shrink: 0;
}
.type-ins .diff-type-badge { background: rgba(46,168,110,0.15); color: var(--diff-add-bar); }
.type-del .diff-type-badge { background: rgba(217,95,95,0.15); color: var(--diff-del-bar); }
.type-mod .diff-type-badge { background: rgba(201,178,58,0.15); color: var(--diff-mod-bar); }

/* ── MAIN ── */
#main { grid-area: main; display: flex; flex-direction: column; overflow: hidden; }

/* ── INPUT VIEW ── */
#input-view { display: flex; flex: 1; overflow: hidden; gap: 2px; }
#input-view.hidden { display: none; }

.editor-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-editor);
  border: 1px solid var(--border);
  position: relative;
}

.pane-header {
  display: flex;
  align-items: center;
  padding: 0 10px;
  height: 34px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  color: var(--text-label);
  gap: 6px;
  flex-shrink: 0;
}
.pane-label {
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.pane-header.left .pane-label { color: var(--diff-del-bar); }
.pane-header.right .pane-label { color: var(--diff-add-bar); }
.pane-filename {
  color: var(--accent-cyan);
  font-size: 11px;
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.line-count { margin-left: auto; color: var(--text-dim); font-size: 10px; flex-shrink: 0; }

.open-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text-label);
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  transition: all 0.12s;
  flex-shrink: 0;
  white-space: nowrap;
}
.open-btn:hover { background: rgba(255,255,255,0.08); color: var(--text-main); border-color: var(--border-light); }
.open-btn:active { background: var(--nav-active); }
.open-btn svg { width: 11px; height: 11px; }

/* Drag & drop overlay */
.drop-overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  background: rgba(62,207,207,0.08);
  border: 2px dashed var(--accent-cyan);
  border-radius: 2px;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--accent-cyan);
  font-weight: 700;
  letter-spacing: 1px;
  pointer-events: none;
}
.editor-pane.drag-over .drop-overlay { display: flex; }

/* CodeMirror input editors fill the pane below the header */
.cm-host {
  flex: 1;
  min-height: 0;
  display: flex;
  overflow: hidden;
}
.cm-host .cm-editor { flex: 1; height: 100%; min-width: 0; background: transparent; }
.cm-host .cm-editor.cm-focused { outline: none; }
.cm-host .cm-scroller { -webkit-overflow-scrolling: touch; }

/* ── DIFF VIEW ── */
#diff-view { flex: 1; overflow: hidden; display: none; flex-direction: column; }
#diff-view.visible { display: flex; }

/* Sticky header bar */
.diff-header {
  display: flex;
  flex-shrink: 0;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
}
.dh-gutter {
  width: 48px; min-width: 48px; flex-shrink: 0;
  padding: 4px 8px 4px 4px;
  text-align: right;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
}
.dh-cell {
  flex: 1;
  padding: 4px 12px;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.dh-filename {
  color: var(--text-dim);
  font-weight: 500;
  letter-spacing: 0;
  margin-left: 6px;
}
.dh-before { color: var(--diff-del-bar); }
.dh-after  { color: var(--diff-add-bar); }
.dh-divider { width: 2px; background: var(--border); flex-shrink: 0; }

/* Scrollable diff body */
.diff-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ── DIV ROWS ── */
.diff-row {
  display: flex;
  align-items: stretch;
  min-height: 24px;
  font-size: 13px;
  line-height: 1.7;
}

/* Gutter */
.dr-gutter {
  width: 48px; min-width: 48px; flex-shrink: 0;
  background: var(--bg-gutter);
  border-right: 1px solid var(--border);
  text-align: right;
  padding: 2px 8px 2px 4px;
  color: var(--text-dim);
  font-size: 11px;
  user-select: none;
  white-space: nowrap;
}
.dr-gutter-left { border-left: 3px solid transparent; }

/* Cell — split view wraps at word boundaries; unified overrides to no-wrap below */
.dr-cell {
  flex: 1;
  padding: 2px 12px;
  white-space: pre-wrap;
  word-break: break-word;
  min-width: 0;
  overflow-wrap: break-word;
}

/* Unified view — full lines no wrapping, highlight stretches with content */
.diff-unified-inner {
  min-width: max-content;
  width: 100%;
}
.diff-row-unified {
  display: flex;
  min-width: 100%;
}
.diff-row-unified .dr-cell {
  white-space: pre;
  word-break: normal;
  overflow-wrap: normal;
}

/* Split divider */
.dr-divider {
  width: 2px; flex-shrink: 0;
  background: var(--border);
}

/* Row types */
.diff-row.row-add { background: var(--diff-add-bg); }
.diff-row.row-add .dr-gutter-left { border-left-color: var(--diff-add-bar); }
.diff-row.row-add .dr-cell { color: #9fe0b5; }

.diff-row.row-del { background: var(--diff-del-bg); }
.diff-row.row-del .dr-gutter-left { border-left-color: var(--diff-del-bar); }
.diff-row.row-del .dr-cell { color: #e89898; }

.diff-row.row-mod { background: var(--diff-mod-bg); }
.diff-row.row-mod .dr-gutter-left { border-left-color: var(--diff-mod-bar); }
.diff-row.row-mod .dr-cell { color: #e2d07a; }

.diff-row.row-ctx { background: var(--bg-editor); }
.diff-row.row-ctx .dr-cell { color: var(--text-main); }

.diff-row.highlighted { filter: brightness(1.45); outline: 1px solid rgba(255,255,255,0.1); }

/* Inline char diff spans */
.inline-del { background: var(--diff-del-hl); border-radius: 2px; padding: 0 1px; }
.inline-add { background: var(--diff-add-hl); border-radius: 2px; padding: 0 1px; }

/* Fold row */
.diff-fold {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  background: var(--bg-gutter);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  color: var(--accent-cyan);
  font-size: 11px;
}
.diff-fold:hover { background: var(--nav-active); }

/* Empty state */
.diff-empty {
  justify-content: center;
  padding: 40px;
  color: var(--text-dim);
}

/* ── STATUS BAR ── */
#statusbar {
  grid-area: status;
  background: var(--bg-header);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 14px;
  font-size: 10px;
  color: var(--text-dim);
}
.status-item { display: flex; align-items: center; gap: 4px; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent-cyan); }
#jump-indicator { margin-left: auto; color: var(--accent-cyan); font-size: 11px; font-weight: 500; }

/* ── FLOATING JUMP NAV ── */
.jump-nav {
  display: none;
  position: fixed;
  z-index: 200;
  bottom: 46px;
  right: 14px;
  flex-direction: column;
  gap: 6px;
}

.jump-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border-light);
  background: var(--bg-panel);
  color: var(--accent-cyan);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 18px;
  transition: all 0.15s;
  box-shadow: 0 4px 18px rgba(0,0,0,0.5);
  -webkit-tap-highlight-color: transparent;
}
.jump-btn:hover { background: var(--nav-active); border-color: var(--accent-cyan); box-shadow: 0 4px 20px rgba(62,207,207,0.2); }
.jump-btn:disabled { opacity: 0.25; pointer-events: none; }

/* ── MOBILE BOTTOM SHEET ── */
#mobile-sheet {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 300;
  pointer-events: none;
}
#mobile-sheet.open { pointer-events: all; }

#sheet-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
  opacity: 0;
  transition: opacity 0.22s;
}
#mobile-sheet.open #sheet-backdrop { opacity: 1; }

#sheet-panel {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  border-radius: 14px 14px 0 0;
  max-height: 70dvh;
  display: flex;
  flex-direction: column;
  transform: translateY(100%);
  transition: transform 0.24s cubic-bezier(0.32,0.72,0,1);
}
#mobile-sheet.open #sheet-panel { transform: translateY(0); }

#sheet-handle {
  width: 36px;
  height: 4px;
  border-radius: 2px;
  background: var(--border-light);
  margin: 10px auto 6px;
  flex-shrink: 0;
}

#sheet-title {
  padding: 4px 16px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#sheet-list { overflow-y: auto; flex: 1; }

.sheet-item {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  gap: 12px;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.1s;
}
.sheet-item:active { background: var(--nav-active); }
.sheet-item.active { background: var(--nav-active); }

.sheet-item-bar { width: 3px; height: 32px; border-radius: 2px; flex-shrink: 0; }
.sheet-item.type-ins .sheet-item-bar { background: var(--diff-add-bar); }
.sheet-item.type-del .sheet-item-bar { background: var(--diff-del-bar); }
.sheet-item.type-mod .sheet-item-bar { background: var(--diff-mod-bar); }

.sheet-item-body { flex: 1; min-width: 0; }
.sheet-item-meta { font-size: 10px; color: var(--text-dim); margin-bottom: 3px; display: flex; gap: 8px; }
.sheet-item-preview { font-size: 12px; color: var(--text-main); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.sheet-badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 2px 6px;
  border-radius: 2px;
  flex-shrink: 0;
}
.type-ins .sheet-badge { background: rgba(46,168,110,0.15); color: var(--diff-add-bar); }
.type-del .sheet-badge { background: rgba(217,95,95,0.15); color: var(--diff-del-bar); }
.type-mod .sheet-badge { background: rgba(201,178,58,0.15); color: var(--diff-mod-bar); }

/* ── MOBILE RESPONSIVE ── */
@media (max-width: 700px) {
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: 48px 40px 1fr 30px;
    grid-template-areas:
      "titlebar"
      "toolbar"
      "main"
      "status";
  }

  #sidebar { display: none; }
  #sidebar-toggle { display: flex; }

  .stat-label { display: none; }
  .stat-pill { padding: 3px 6px; gap: 3px; }
  .diff-stats { gap: 5px; }

  #input-view { flex-direction: column; gap: 2px; }
  .editor-pane { min-height: 120px; }
  .cm-host .cm-editor { font-size: 14px; }

  #toolbar { padding: 0 8px; }
  .tb-btn { padding: 5px 8px; font-size: 11px; }

  .jump-nav { bottom: 48px; right: 10px; }
  .jump-btn { width: 48px; height: 48px; font-size: 20px; }

  .diff-row { font-size: 12px; min-height: 22px; }
  .dr-gutter { width: 38px; min-width: 38px; font-size: 10px; padding: 2px 6px; }
  .dr-cell { padding: 2px 8px; }
  .dh-gutter { width: 38px; min-width: 38px; }
}

/* ── LOADING OVERLAY ── */
#diff-loading {
  display: none;
  position: absolute;
  inset: 0;
  z-index: 50;
  background: rgba(13,15,17,0.82);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  backdrop-filter: blur(2px);
}

.loading-spinner {
  width: 28px;
  height: 28px;
  border: 2px solid var(--border-light);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-label {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

/* ── HUNK WRAPPER — wraps all rows of a changed block in split view ── */
.hunk-wrapper {
  cursor: pointer;
  display: block;
}
.hunk-wrapper:hover .hunk-row {
  filter: brightness(1.12);
}
.hunk-wrapper.hunk-selected {
  outline: 2px solid rgba(255,255,255,0.22);
  outline-offset: -1px;
}
.hunk-wrapper.hunk-selected .hunk-row {
  filter: brightness(1.28);
}
/* Suppress the horizontal seam between rows inside a selected wrapper:
   hide bottom border of gutter and divider on all but the last row */
.hunk-wrapper.hunk-selected .hunk-row:not(:last-child) .dr-gutter {
  border-bottom: 1px solid transparent;
  margin-bottom: -1px;
}
.hunk-wrapper.hunk-selected .hunk-row:not(:last-child) .dr-divider {
  margin-bottom: -1px;
}
/* Resolved/merged row — replaces red/green rows after merge is applied */
.row-merged .dr-gutter-left {
  border-left-color: var(--accent-cyan) !important;
}
.row-merged {
  background: rgba(62,207,207,0.06);
}

/* ── MERGE BAR (split view only, shown on hunk click) ── */
.merge-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  min-height: 32px;
  background: var(--bg-gutter);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: max-height 0.15s ease, opacity 0.15s ease, border-color 0.15s;
  max-height: 32px;
  opacity: 1;
}

/* Hidden state — collapses to nothing */
.merge-bar.merge-bar-hidden {
  max-height: 0;
  min-height: 0;
  opacity: 0;
  border-top-width: 0;
  border-bottom-width: 0;
  pointer-events: none;
}

.merge-bar-resolved {
  border-color: rgba(62,207,207,0.25);
}

.merge-bar-sep {
  width: 1px;
  height: 16px;
  background: var(--border-light);
  flex-shrink: 0;
}

.merge-bar-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 20px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  transition: all 0.12s;
  white-space: nowrap;
  flex-shrink: 0;
}
.merge-bar-btn svg { width: 12px; height: 12px; flex-shrink: 0; }
.merge-bar-btn:hover { color: var(--text-main); background: rgba(255,255,255,0.07); }

.merge-bar-btn.merge-bar-left-active  {
  background: rgba(217,95,95,0.18);
  color: var(--diff-del-bar);
}
.merge-bar-btn.merge-bar-right-active {
  background: rgba(46,168,110,0.18);
  color: var(--diff-add-bar);
}

/* ── OUTPUT PANELS ── */
#output-panels {
  display: none;
  flex-shrink: 0;
  height: 220px;
  border-top: 1px solid var(--border);
  background: var(--bg-deep);
  flex-direction: row;
}
#output-panels.visible { display: flex; }

/* Output panels — diff-view and input-view each flex: 1 within #main column */
#diff-view { flex: 1; }
#input-view { flex: 1; }

.output-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.output-pane-divider {
  width: 2px;
  background: var(--border);
  flex-shrink: 0;
}

.output-pane-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  height: 30px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.output-pane-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  flex-shrink: 0;
}
.output-pane-label.del-color { color: var(--diff-del-bar); }
.output-pane-label.add-color { color: var(--diff-add-bar); }

.output-pane-fname {
  color: var(--accent-cyan);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.output-merge-hint {
  font-size: 10px;
  color: var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.output-copy-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 3px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  color: var(--text-label);
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  transition: all 0.12s;
  flex-shrink: 0;
  white-space: nowrap;
}
.output-copy-btn:hover { background: rgba(255,255,255,0.08); color: var(--text-main); border-color: var(--border-light); }
.output-copy-btn.copied { background: rgba(46,168,110,0.15); color: var(--diff-add-bar); border-color: rgba(46,168,110,0.4); }
.output-copy-btn svg { width: 11px; height: 11px; }

.output-body {
  flex: 1;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.output-lines {
  width: 100%;
}

.out-row {
  display: flex;
  align-items: stretch;
  min-height: 20px;
  font-size: 12px;
  line-height: 1.6;
}

.out-gutter {
  width: 48px;
  min-width: 48px;
  flex-shrink: 0;
  background: var(--bg-gutter);
  border-right: 1px solid var(--border);
  text-align: right;
  padding: 2px 8px 2px 4px;
  color: var(--text-dim);
  font-size: 10px;
  user-select: none;
  white-space: pre;
  font-family: 'JetBrains Mono', monospace;
}

.out-cell {
  flex: 1;
  min-width: 0;
  padding: 2px 10px;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: break-word;
  color: var(--text-main);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
}

.out-empty {
  padding: 20px;
  color: var(--text-dim);
  font-size: 11px;
}

/* ── MOBILE: output panels stack vertically ── */
@media (max-width: 700px) {
  #output-panels {
    flex-direction: column;
    height: 300px;
  }
  .output-pane-divider {
    width: 100%;
    height: 2px;
  }
  .output-pane { height: 50%; }
}