/* Comparar · estilos propios */
:root { --del-bg: rgba(229, 72, 77, .1); --del-hl: rgba(229, 72, 77, .28); --ins-bg: rgba(46, 158, 91, .1); --ins-hl: rgba(46, 158, 91, .3); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --del-bg: rgba(240, 120, 109, .1); --del-hl: rgba(240, 120, 109, .3); --ins-bg: rgba(92, 201, 138, .1); --ins-hl: rgba(92, 201, 138, .28); } }
:root[data-theme="dark"] { --del-bg: rgba(240, 120, 109, .1); --del-hl: rgba(240, 120, 109, .3); --ins-bg: rgba(92, 201, 138, .1); --ins-hl: rgba(92, 201, 138, .28); }

body { overflow: hidden; }
.shell { display: grid; height: 100dvh; grid-template-rows: 48px minmax(150px, 32vh) auto minmax(0, 1fr); }
.top-mid { margin: 0 auto; display: flex; align-items: center; gap: 8px; }
.topbar .top-actions { margin-left: 0; }
.pill { padding: 1px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums; }
.pill.i { background: var(--ins-bg); color: var(--ok); }
.pill.d { background: var(--del-bg); color: var(--danger); }

.inputs { display: grid; grid-template-columns: minmax(0, 1fr) 32px minmax(0, 1fr); gap: 0; padding: 10px 12px 0; min-height: 0; }
.in-pane { display: flex; flex-direction: column; min-height: 0; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.in-pane.over { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.in-h { display: flex; align-items: center; gap: 8px; height: 34px; padding: 0 6px 0 12px; border-bottom: 1px solid var(--border); }
.in-t { font-weight: 600; font-size: 12.5px; }
.in-m { color: var(--text-3); font-size: 11.5px; font-variant-numeric: tabular-nums; }
.dot { width: 8px; height: 8px; border-radius: 50%; }
.dot.del { background: var(--danger); } .dot.ins { background: var(--ok); }
.in-pane textarea { flex: 1; min-height: 0; width: 100%; padding: 10px 12px; border: 0; outline: 0; resize: none; background: transparent; font: 400 12.5px/1.6 var(--mono); }
.swap { align-self: center; justify-self: center; display: grid; place-items: center; width: 26px; height: 26px; padding: 0; border: 1px solid var(--border-2); border-radius: 50%; background: var(--panel); color: var(--text-2); }
.swap:hover { color: var(--text); background: var(--hover); }

.bar { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; padding: 10px 12px; }

.result { min-height: 0; overflow: auto; margin: 0 12px 12px; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; }
.result .empty { padding: 40px; }
.note { margin: 10px 12px 0; padding: 8px 10px; border-radius: 8px; background: var(--sunken); color: var(--text-2); font-size: 12.5px; }

/* Vista por líneas */
.lines { font: 400 12.5px/1.6 var(--mono); }
.row { display: grid; }
.lines.split .row { grid-template-columns: 48px minmax(0, 1fr) 48px minmax(0, 1fr); }
.lines.unified .row { grid-template-columns: 44px 44px 20px minmax(0, 1fr); }
.ln { padding: 0 8px; text-align: right; color: var(--text-3); background: var(--sunken); user-select: none; font-size: 11.5px; }
.tx { padding: 0 12px; white-space: pre-wrap; overflow-wrap: anywhere; min-height: 1.6em; }
.lines.split .row > .tx:nth-child(2) { border-right: 1px solid var(--border); }
.sg { text-align: center; user-select: none; color: var(--text-3); }
.tx.d, .row.u.d .tx, .row.u.d .sg { background: var(--del-bg); }
.tx.i, .row.u.i .tx, .row.u.i .sg { background: var(--ins-bg); }
.ln.d, .row.u.d .ln { background: var(--del-hl); color: var(--danger); }
.ln.i, .row.u.i .ln { background: var(--ins-hl); color: var(--ok); }
.row.u.d .sg { color: var(--danger); } .row.u.i .sg { color: var(--ok); }
.tx.empty { background: repeating-linear-gradient(135deg, transparent 0 6px, var(--sunken) 6px 7px); }
.tx del, .flow del { background: var(--del-hl); color: inherit; text-decoration: none; border-radius: 2px; }
.tx ins, .flow ins { background: var(--ins-hl); color: inherit; text-decoration: none; border-radius: 2px; }
.flow del { text-decoration: line-through; text-decoration-color: var(--danger); }
.fold { padding: 3px 12px; background: var(--sunken); color: var(--text-3); font: 400 11.5px var(--sans); text-align: center; border-block: 1px solid var(--border); }
.chg-start.cur, .row.chg-start.cur { outline: 2px solid var(--accent); outline-offset: -2px; }

/* Vista por palabras / caracteres */
.inline { display: grid; grid-template-columns: minmax(0, 1fr); }
.inline.split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.inline.split .flow:first-child { border-right: 1px solid var(--border); }
.flow { padding: 14px 16px; white-space: pre-wrap; overflow-wrap: anywhere; font: 400 13px/1.75 var(--mono); }

@media (max-width: 860px) {
  body { overflow: auto; }
  .shell { height: auto; grid-template-rows: 48px auto auto auto; }
  .inputs { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .in-pane { height: 200px; }
  .swap { transform: rotate(90deg); }
  .result { min-height: 60vh; }
  .top-mid { display: none; }
  .topbar .top-actions { margin-left: auto; }
  .lines.split .row { grid-template-columns: 34px minmax(0, 1fr) 34px minmax(0, 1fr); }
}

/* ───────── Móvil ───────── */
@media (max-width: 700px) {
  .top-mid { display: flex; margin: 0 auto 0 4px; gap: 4px; }
  .top-mid .muted { display: none; }
  .inputs { padding: 8px 12px 0; }
  .in-pane { height: 150px; }
  .swap { width: 40px; height: 40px; margin: -4px 0; }
  .bar { gap: 8px; padding: 10px 12px; }
  #unitSeg { display: flex; width: 100%; }
  #unitSeg button { flex: 1; }
  #viewSeg { display: none; }
  .bar .grow { display: none; }
  #sendBtn, #patchBtn { flex: 1; justify-content: center; }
  /* Saltar entre cambios: botones fijos abajo, al alcance del pulgar */
  #prevBtn, #nextBtn { position: fixed; bottom: max(14px, env(safe-area-inset-bottom)); z-index: 20; min-height: 44px; padding: 0 16px; border: 1px solid var(--border-2); border-radius: 22px; background: var(--panel); box-shadow: var(--shadow-lg); }
  #prevBtn { right: 136px; }
  #nextBtn { right: 14px; }
  .result { margin-bottom: 76px; min-height: 50vh; }
  .lines.unified .row { grid-template-columns: 30px 30px 16px minmax(0, 1fr); }
  .ln { padding: 0 4px; }
  .tx { padding: 0 8px; }
  .flow { padding: 12px; }
}
:root[data-input="touch"] .in-pane textarea { font-size: 16px; }
:root[data-input="touch"] .in-h { height: 44px; }
:root[data-input="touch"] .lines, :root[data-input="touch"] .flow { font-size: 13.5px; }