:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #1c1e21;
  --muted: #5f6368;
  --accent: #1a5fb4;
  --added: #1e7e34;
  --removed: #b3261e;
  --changed: #b06000;
  --border: #d9dce1;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}

.site-header, main, .site-footer {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header { padding-top: 28px; }
.site-header h1 { margin: 0 0 4px; font-size: 1.9rem; }
.tagline { margin: 0 0 20px; color: var(--muted); }

.inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 760px) {
  .inputs { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
}

.panel h2 { margin: 0 0 10px; font-size: 1.1rem; }
.file-tag {
  font-size: 0.72rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border-radius: 4px;
  padding: 2px 6px;
  vertical-align: middle;
  margin-left: 6px;
}

.paste-label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 4px; }

textarea {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  resize: vertical;
}

.or-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.8rem;
  margin: 8px 0;
}
.or-row::before, .or-row::after {
  content: "";
  flex: 1;
  border-top: 1px solid var(--border);
}

.file-label input[type="file"] { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.file-btn {
  display: inline-block;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 0.9rem;
  cursor: pointer;
}
.file-btn:hover { background: #eaf1fb; }
.file-btn:focus-visible, .file-label input[type="file"]:focus-visible + .file-btn {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.file-name { font-size: 0.8rem; color: var(--muted); margin: 6px 0 0; min-height: 1em; }

.options {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 14px;
  margin: 18px 0;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: 8px 12px 10px;
}
fieldset legend { font-size: 0.8rem; color: var(--muted); padding: 0 4px; }
fieldset label { display: block; font-size: 0.92rem; margin: 2px 0; }

.hint { font-size: 0.8rem; color: var(--changed); margin: 6px 0 0; max-width: 320px; }

#compare-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 34px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
}
#compare-btn:hover { filter: brightness(1.08); }
#compare-btn:disabled { opacity: 0.5; cursor: default; }

.status:empty { display: none; }
.status {
  background: #fdecea;
  border: 1px solid #f5c6c0;
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 16px;
  font-size: 0.92rem;
  white-space: pre-wrap;
}

.results {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 24px;
}
.results h2 { margin-top: 0; }

.summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 0 0 12px;
}
.summary li {
  border-radius: 6px;
  padding: 6px 12px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--border);
}
.summary .s-added { color: var(--added); }
.summary .s-removed { color: var(--removed); }
.summary .s-changed { color: var(--changed); }
.summary .s-unchanged { color: var(--muted); }

.warning-list {
  background: #fff8e6;
  border: 1px solid #f0d9a0;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.88rem;
  margin-bottom: 12px;
}
.warning-list ul { margin: 4px 0; padding-left: 20px; }

.diff-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-bottom: 16px;
}
.diff-table caption {
  text-align: left;
  font-weight: 600;
  padding: 6px 0;
}
.diff-table th, .diff-table td {
  border: 1px solid var(--border);
  padding: 4px 8px;
  text-align: left;
  vertical-align: top;
}
.diff-table th { background: #eef1f5; }
.diff-table td { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; word-break: break-word; }

.cell-from { color: var(--removed); text-decoration: line-through; display: block; }
.cell-to { color: var(--added); display: block; }

.row-added { background: #e9f7ee; }
.row-removed { background: #fdecea; }

.render-note { font-size: 0.82rem; color: var(--muted); margin: 4px 0 14px; }

.docs h2 { font-size: 1.15rem; margin-top: 26px; }
.docs code {
  background: #eceff3;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.85em;
}

.site-footer {
  margin-top: 40px;
  padding-bottom: 28px;
  color: var(--muted);
  font-size: 0.85rem;
}