:root {
  --bg: #11161d;
  --bg-2: #161b22;
  --bg-3: #1c232c;
  --border: #2a3038;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --alt: #0d9488;
  --alt-hover: #0b7d72;
  --ok: #2ea043;
  --warn: #d29922;
  --danger: #f85149;

  /* Editor panes — softened so the left/right transition isn't black↔white */
  --code-bg: #1b2129;
  --code-text: #dbe4ee;
  --visual-bg: #eceef2;
  --visual-text: #1c2127;

  --mono: "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* Light theme — both panes light, gentle on the eyes */
body.light {
  --bg: #eef1f5;
  --bg-2: #e3e7ee;
  --bg-3: #d8dde6;
  --border: #c4cbd6;
  --text: #1c2127;
  --text-dim: #5b6470;
  --code-bg: #f6f8fb;
  --code-text: #1f2933;
  --visual-bg: #ffffff;
  --visual-text: #1c2127;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

/* Selection mirrored from the other pane */
::highlight(mirror) { background-color: rgba(255, 196, 0, 0.42); color: inherit; }

/* ---- Top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 10px; }
.logo {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--accent);
  background: var(--bg-3);
  padding: 4px 8px;
  border-radius: 6px;
}
.brand h1 { font-size: 16px; margin: 0; font-weight: 600; }

.toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.btn {
  background: var(--bg-3);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background .12s, border-color .12s;
  white-space: nowrap;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:disabled { opacity: .4; cursor: default; }
.btn:disabled:hover { background: var(--bg-3); border-color: var(--border); color: var(--text); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-ghost { background: transparent; }
.btn-alt { background: var(--alt); border-color: var(--alt); color: #fff; }
.btn-alt:hover { background: var(--alt-hover); border-color: var(--alt-hover); color: #fff; }

.status { font-size: 12px; min-width: 70px; }
.status.ok { color: var(--ok); }
.status.warn { color: var(--warn); }

/* ---- Controls bar (options + find/replace, full width above editors) ---- */
.controls {
  display: flex;
  gap: 1px;
  background: var(--border);
  border-bottom: 1px solid var(--border);
}
.control-block { background: var(--bg-2); padding: 10px 16px; }
.options-block { flex: 1; min-width: 0; }
.fr-block { width: 320px; flex-shrink: 0; }

.control-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.toggle-all { text-transform: none; letter-spacing: 0; cursor: pointer; }
.toggle-all input { vertical-align: middle; margin-right: 4px; accent-color: var(--accent); }

.options {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 2px 12px;
}
.option {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 6px;
  font-size: 13px;
  border-radius: 5px;
  cursor: pointer;
}
.option:hover { background: var(--bg-3); }
.option input { accent-color: var(--accent); }
.option.danger { color: var(--danger); }

.find-replace { display: flex; flex-direction: column; gap: 8px; }
.find-replace input[type="text"] {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 7px 10px;
  font-size: 13px;
  font-family: var(--mono);
  width: 100%;
}
.find-replace input[type="text"]:focus { outline: none; border-color: var(--accent); }
.fr-row { display: flex; align-items: center; gap: 12px; font-size: 12px; color: var(--text-dim); }
.fr-row label { display: flex; align-items: center; gap: 5px; cursor: pointer; }
.fr-row input { accent-color: var(--accent); }
.fr-row .btn { margin-left: auto; padding: 6px 12px; }

/* ---- Workspace: visual (left) | divider | code (right) ---- */
.workspace {
  flex: 1;
  display: flex;
  min-height: 0;
}
.pane {
  flex: 1 1 50%;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}
.divider { width: 1px; background: var(--border); flex-shrink: 0; }

.pane-head {
  padding: 8px 14px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-dim);
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  border-top: 1px solid var(--border);
}

.visual {
  flex: 1;
  overflow: auto;
  padding: 16px 20px;
  background: var(--visual-bg);
  color: var(--visual-text);
  outline: none;
  line-height: 1.6;
}
.visual:focus { box-shadow: inset 0 0 0 2px var(--accent); }
.visual img { max-width: 100%; height: auto; }

.code {
  flex: 1;
  width: 100%;
  border: none;
  outline: none;
  resize: none;
  padding: 16px 20px;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
  tab-size: 2;
}

/* ---- Footer ---- */
.footer {
  padding: 8px 16px;
  font-size: 12px;
  color: var(--text-dim);
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  text-align: center;
}

/* ---- Responsive / mobile ---- */
@media (max-width: 860px) {
  html, body { height: auto; min-height: 100%; }
  body { min-height: 100vh; }

  .topbar { padding: 10px 12px; }
  .brand h1 { font-size: 15px; }
  .toolbar { gap: 6px; }
  .btn { padding: 9px 14px; }

  .controls { flex-direction: column; }
  .fr-block { width: auto; }
  .options { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .option { padding: 8px 6px; }

  .workspace { flex-direction: column; }
  .divider { width: auto; height: 1px; }
  .pane { min-height: 48vh; }

  /* 16px inputs prevent iOS Safari from auto-zooming on focus */
  .code, .find-replace input[type="text"] { font-size: 16px; }
}

@media (max-width: 480px) {
  .options { grid-template-columns: 1fr 1fr; }
}