/* Tema: automático según el sistema, o fijado con data-theme="light|dark" en <html> */
:root {
  --bg: #f7f8fa;
  --fg: #1d2330;
  --muted: #5b6475;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --card: #ffffff;
  --border: #dde1e8;
  --mark-bg: #dbeafe;
  --mark-fg: #1e40af;
  --warn: #92400e;
  --error: #b91c1c;
  color-scheme: light;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f141c;
    --fg: #e6e9ef;
    --muted: #9aa3b2;
    --accent: #60a5fa;
    --accent-fg: #0f141c;
    --card: #171d27;
    --border: #2a3342;
    --mark-bg: #1e3a5f;
    --mark-fg: #bfdbfe;
    --warn: #fbbf24;
    --error: #f87171;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f141c;
  --fg: #e6e9ef;
  --muted: #9aa3b2;
  --accent: #60a5fa;
  --accent-fg: #0f141c;
  --card: #171d27;
  --border: #2a3342;
  --mark-bg: #1e3a5f;
  --mark-fg: #bfdbfe;
  --warn: #fbbf24;
  --error: #f87171;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

header, main, footer {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
}

header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.5rem;
}

.toolbar { display: flex; gap: 0.4rem; flex-shrink: 0; }
header h1 { margin-bottom: 0.25rem; }
header p  { color: var(--muted); margin: 0.25rem 0; }

.badge {
  display: inline-block;
  margin-top: 0.75rem !important;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.muted { color: var(--muted); font-weight: normal; }

/* ---------- Opciones ---------- */

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

fieldset {
  margin: 0;
  padding: 0.5rem 0.75rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
}

legend {
  padding: 0 0.35rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.875rem;
  cursor: pointer;
  user-select: none;
}

.chip:has(input:checked) {
  border-color: var(--accent);
  background: var(--mark-bg);
  color: var(--mark-fg);
}

.chip input { margin: 0; accent-color: var(--accent); }

.chip.select { cursor: default; }

select {
  padding: 0.1rem 0.3rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 0.8rem;
}

/* ---------- Paneles ---------- */

.panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  overflow: hidden;
}

.pane-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
}

.actions { display: flex; flex-wrap: wrap; gap: 0.4rem; }

button {
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--fg);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
}

button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

button.ghost { background: var(--card); }
button.icon { padding: 0.4rem 0.6rem; line-height: 1; font-size: 1rem; }

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}

button:focus-visible, textarea:focus-visible, .output:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

textarea, .output {
  width: 100%;
  height: 60vh;
  min-height: 280px;
  margin: 0;
  padding: 0.75rem;
  border: 0;
  background: transparent;
  color: var(--fg);
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.5;
  tab-size: 4;
}

#input { resize: vertical; }

.output {
  overflow: auto;
  white-space: pre;
}

.output:empty::before {
  content: attr(data-empty);
  color: var(--muted);
  font-family: system-ui, sans-serif;
}

.output mark {
  padding: 0 0.15em;
  border-radius: 4px;
  background: var(--mark-bg);
  color: var(--mark-fg);
}

/* ---------- Estado y estadísticas ---------- */

.status {
  min-height: 1.25rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.status-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.status-row .hint { margin: 0; }

.stats .chip { cursor: default; background: var(--card); }
.stats strong { color: var(--accent); }

/* ---------- Secciones plegables ---------- */

details {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  padding: 0.75rem 1rem;
}

summary { cursor: pointer; font-weight: 600; }

.warning { color: var(--warn); font-size: 0.9rem; }

.table-wrap { overflow-x: auto; max-height: 50vh; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th, td {
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th { color: var(--muted); font-weight: 600; position: sticky; top: 0; background: var(--card); }
td:first-child, td:nth-child(2) { font-family: var(--mono); }
td:nth-child(2) { word-break: break-all; white-space: pre-wrap; }

.rules {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.75rem;
}

.actions.end { justify-content: flex-end; margin-top: 0.75rem; }

.restore-out {
  display: flex;
  flex-direction: column;
  min-width: 0;
  margin-top: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.pane-head.flat { font-size: 0.9rem; padding: 0.35rem 0.6rem; }

.output.small { height: auto; min-height: 8rem; max-height: 40vh; white-space: pre-wrap; overflow-wrap: anywhere; }

#restoreBox .rules > textarea { margin-top: 0.35rem; }

.rules label { font-weight: 600; font-size: 0.9rem; }

.rules textarea {
  height: auto;
  min-height: 0;
  margin-top: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  resize: vertical;
}

.hint { color: var(--muted); font-size: 0.8rem; margin: 0.35rem 0 0; }

code { font-family: var(--mono); font-size: 0.9em; }

.errors { margin: 0.35rem 0 0; padding-left: 1.1rem; color: var(--error); font-size: 0.8rem; }
.errors:empty { display: none; }

.note { margin: 0; color: var(--muted); font-size: 0.85rem; }

/* ---------- Arrastrar y soltar ---------- */

.drop-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border: 3px dashed var(--accent);
  font-size: 1.25rem;
  font-weight: 600;
  pointer-events: none;
  z-index: 10;
}

.drop-overlay[hidden] { display: none; }

footer {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

a { color: var(--accent); }

@media (max-width: 800px) {
  header, main, footer { padding: 1rem; }
  .panes, .rules { grid-template-columns: 1fr; }
  textarea, .output { height: 40vh; }
  header { flex-direction: column-reverse; }
  .toolbar { align-self: flex-end; }
}