/* =====================================================================
   Diff Checker Pro — app.css
   Extends the shared design system (base.css). Colors derive ONLY from
   base.css CSS variables so dark + light themes both work.
   ===================================================================== */

/* ---- Theme toggle icon swap (sun in dark, moon in light) ---- */
[data-theme="light"] .icon-sun { display: none; }
.icon-moon { display: none; }

/* ===================== Toolbar ===================== */
.toolbar-panel { padding: var(--space-4) var(--space-5); }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3) var(--space-4); }
.toolbar-group { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.toolbar .spacer { flex: 1; }

/* ===================== Status badge ===================== */
#statusBadge .status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-muted); flex: none;
  transition: background var(--dur-2), box-shadow var(--dur-2);
}
#statusBadge.has-changes { background: var(--warning-soft); color: var(--warning); border-color: transparent; }
#statusBadge.has-changes .status-dot { background: var(--warning); box-shadow: 0 0 10px var(--warning); }
#statusBadge.is-same { background: var(--success-soft); color: var(--success); border-color: transparent; }
#statusBadge.is-same .status-dot { background: var(--success); box-shadow: 0 0 10px var(--success); }

/* ===================== Two-pane input ===================== */
.editor { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-5); margin-top: var(--space-5); }
.pane { display: flex; flex-direction: column; padding: 0; overflow: hidden; min-width: 0; }
.pane-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); padding: var(--space-4) var(--space-5); border-bottom: 1px solid var(--border); }
.pane-title { margin: 0; font-size: 13px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--text-secondary); }
.pane-meta { font-size: 12px; }

.pane--input textarea {
  flex: 1; width: 100%; min-height: 220px; border: none; border-radius: 0;
  background: transparent; padding: var(--space-5); font-size: 13.5px; line-height: 1.7;
  resize: none; tab-size: 2;
}
.pane--input textarea:focus { box-shadow: none; background: transparent; }

/* ===================== Summary bar ===================== */
.stats-bar { margin-top: var(--space-5); display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); padding: var(--space-5) var(--space-6); }
.stat { display: flex; flex-direction: column; gap: 4px; text-align: center; }
.stat-label { font-size: 11px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase; color: var(--text-muted); }
.stat-value { font-family: var(--font-mono); font-size: clamp(1rem, .85rem + .8vw, 1.35rem); font-weight: 700; letter-spacing: -.01em; }

/* ===================== Diff panel ===================== */
.diff-panel { margin-top: var(--space-5); padding: 0; overflow: hidden; }
.diff-panel .pane-head { padding: var(--space-4) var(--space-5); }
.diff-scroll { position: relative; min-height: 200px; overflow: auto; }

.diff-code { margin: 0; padding: var(--space-5); font-size: 13px; line-height: 1.7; white-space: pre-wrap; word-break: break-word; }
.diff-code:empty { display: none; }

.diff-line { display: block; padding: 1px 6px; border-radius: 4px; }
.diff-line.--add { background: var(--success-soft); color: var(--text); }
.diff-line.--del { background: var(--danger-soft); color: var(--text); }
.diff-marker { display: inline-block; width: 1.4em; color: var(--text-muted); user-select: none; }
.diff-line.--add .diff-marker { color: var(--success); }
.diff-line.--del .diff-marker { color: var(--danger); }

.tok-add { background: var(--success-soft); color: var(--success); border-radius: 3px; padding: 0 1px; }
.tok-del { background: var(--danger-soft); color: var(--danger); text-decoration: line-through; border-radius: 3px; padding: 0 1px; }

/* Side-by-side */
.diff-side { display: none; grid-template-columns: 1fr 1fr; gap: 0; font-size: 13px; line-height: 1.7; }
.diff-side.is-active { display: grid; }
.diff-side-col { padding: var(--space-5); overflow-x: auto; white-space: pre-wrap; word-break: break-word; }
.diff-side-col:first-child { border-right: 1px solid var(--border); }
.side-row { display: flex; align-items: flex-start; gap: var(--space-3); padding: 1px 6px; border-radius: 4px; min-height: 1.7em; }
.side-row.--add { background: var(--success-soft); }
.side-row.--del { background: var(--danger-soft); }
.side-row.--empty { opacity: .35; }
.side-num { flex: none; width: 2.75em; text-align: right; color: var(--text-muted); user-select: none; }
.side-text { flex: 1; min-width: 0; }

/* ===================== Empty / too-large states ===================== */
.empty { text-align: center; color: var(--text-muted); padding: var(--space-10) var(--space-4); }
.empty svg { width: 40px; height: 40px; opacity: .5; margin-bottom: var(--space-3); }

/* ===================== Shortcuts modal table ===================== */
.shortcut-table { width: 100%; border-collapse: collapse; }
.shortcut-table td { padding: 10px 4px; border-bottom: 1px solid var(--border); font-size: 14px; }
.shortcut-table tr:last-child td { border-bottom: none; }
.shortcut-table td:last-child { text-align: right; white-space: nowrap; }
.shortcut-table kbd + kbd { margin-left: 4px; }

/* ===================== Responsive ===================== */
@media (max-width: 860px) {
  .editor { grid-template-columns: 1fr; }
  .pane--input textarea { min-height: 180px; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .diff-side.is-active { grid-template-columns: 1fr; }
  .diff-side-col:first-child { border-right: none; border-bottom: 1px solid var(--border); }
}

@media (max-width: 720px) {
  #statusBadge { display: none; }
  .toolbar .spacer { display: none; }
  .toolbar-group { width: 100%; }
  .toolbar-group .btn { flex: 1; }
  .segmented { flex: 1; }
  .segmented button { flex: 1; }
}

@media (max-width: 460px) {
  .stats-bar { grid-template-columns: 1fr; text-align: left; }
  .stat { text-align: left; }
}