:root {
  --bg: #fff; --fg: #1a1a1a; --muted: #666; --line: #d8d8d8; --accent: #2563eb; --panel: #f7f7f8;
  --add: #15803d; --add-bg: #dcfce7; --del: #b91c1c; --del-bg: #fee2e2; --chg: #a16207; --chg-bg: #fef3c7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111; --fg: #eee; --muted: #999; --line: #333; --accent: #6ea0ff; --panel: #1a1a1b;
    --add: #86efac; --add-bg: #14532d; --del: #fca5a5; --del-bg: #7f1d1d; --chg: #fde68a; --chg-bg: #713f12;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.5 system-ui, sans-serif; }
main { max-width: 1000px; margin: 0 auto; padding: 24px 16px 48px; }
nav { border-bottom: 1px solid var(--line); }
nav .inner { max-width: 1000px; margin: 0 auto; padding: 12px 16px; display: flex; flex-wrap: wrap; gap: 20px; align-items: center; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--fg); }
nav a.brand { font-weight: 600; color: var(--fg); margin-right: 8px; }
nav a[aria-current="page"] { border-bottom: 2px solid var(--accent); }
h1 { font-size: 22px; margin: 0 0 4px; }
p.sub { color: var(--muted); margin: 0 0 20px; }
code { font: 13px ui-monospace, Menlo, monospace; }
.opts { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin-bottom: 16px; }
.opts label { display: flex; gap: 6px; align-items: center; }
.opts input[type=text] { width: 110px; padding: 4px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--fg); }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } }
.col h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 0 0 6px; display: flex; justify-content: space-between; align-items: center; }
textarea { width: 100%; height: 380px; padding: 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); color: var(--fg); font: 13px/1.5 ui-monospace, Menlo, monospace; resize: vertical; }
textarea.short { height: 280px; }
button { padding: 4px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--fg); cursor: pointer; font-size: 13px; }
button:hover { border-color: var(--accent); color: var(--accent); }
#err { color: #dc2626; min-height: 22px; margin-top: 8px; font-size: 14px; }
footer { margin-top: 24px; color: var(--muted); font-size: 13px; }

/* landing */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin-top: 8px; }
.card { display: block; padding: 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); color: inherit; text-decoration: none; }
.card:hover { border-color: var(--accent); }
.card h2 { font-size: 16px; margin: 0 0 4px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }

/* compare results */
#summary { margin: 16px 0 8px; font-weight: 600; }
#results { list-style: none; margin: 0; padding: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
#results:empty { display: none; }
#results li { padding: 8px 12px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 84px 1fr; gap: 4px 12px; align-items: start; }
#results li:first-child { border-top: 0; }
.badge { font-size: 12px; font-weight: 600; text-align: center; padding: 1px 8px; border-radius: 999px; height: fit-content; }
.badge.added { color: var(--add); background: var(--add-bg); }
.badge.removed { color: var(--del); background: var(--del-bg); }
.badge.changed { color: var(--chg); background: var(--chg-bg); }
.path { font-weight: 600; word-break: break-all; }
.vals { grid-column: 2; display: flex; flex-wrap: wrap; gap: 4px 16px; color: var(--muted); }
.vals code { word-break: break-all; }
.vals .old { color: var(--del); }
.vals .new { color: var(--add); }

/* text compare */
.diff { margin-top: 8px; border: 1px solid var(--line); border-radius: 8px; overflow: auto; font: 13px/1.5 ui-monospace, Menlo, monospace; }
.diff:empty { display: none; }
.drow { display: grid; grid-template-columns: 44px 44px 20px 1fr; min-width: max-content; width: 100%; }
.drow .no { color: var(--muted); text-align: right; padding: 0 8px; user-select: none; }
.drow .sign { text-align: center; user-select: none; }
.drow .txt { white-space: pre-wrap; word-break: break-word; padding-right: 12px; }
.drow.add { background: var(--add-bg); }
.drow.remove { background: var(--del-bg); }
.drow.add .sign { color: var(--add); }
.drow.remove .sign { color: var(--del); }
.drow mark { background: rgba(0, 0, 0, .18); color: inherit; border-radius: 3px; padding: 0 1px; }
@media (prefers-color-scheme: dark) { .drow mark { background: rgba(255, 255, 255, .22); } }