:root {
  --ink: #1b1f24; --muted: #5b6470; --line: #d1d5db; --bg: #fafaf8; --panel: #ffffff;
  --accent: #0b5fff; --accent-ink: #ffffff;
  --ok: #156f30; --ok-bg: #e6f4ea; --warn: #9a6700; --warn-bg: #fff8e1; --bad: #b42318; --bad-bg: #fdecec;
  --radius: 10px; --max: 60rem;
}
* { box-sizing: border-box; }
html { font-size: 100%; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.5; }
a { color: var(--accent); }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-ink); padding: .5rem 1rem; z-index: 10; }
.skip:focus { left: .5rem; top: .5rem; }

.site-header { display: flex; align-items: center; justify-content: space-between; max-width: var(--max); margin: 0 auto; padding: 1rem 1.25rem; }
.brand { display: inline-flex; align-items: center; gap: .5rem; font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; }
.lang { font-size: .95rem; }

main { max-width: var(--max); margin: 0 auto; padding: 1rem 1.25rem 3rem; }
main.page { max-width: 46rem; }
main.page h1 { font-size: 1.8rem; margin-top: 1rem; }
main.page h2 { font-size: 1.2rem; margin-top: 2rem; }
.hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); margin: 1rem 0 .5rem; letter-spacing: -.01em; }
.lead { color: var(--muted); font-size: 1.1rem; max-width: 42rem; margin: 0 0 1.5rem; }

.dropzone { border: 2px dashed var(--line); border-radius: var(--radius); background: var(--panel); padding: 2.5rem 1.5rem; text-align: center; cursor: pointer; transition: border-color .15s, background .15s; }
.dropzone.over, .dropzone:hover { border-color: var(--accent); background: #f3f7ff; }
.dropzone.busy { opacity: .6; pointer-events: none; }
.dropzone-label { font-size: 1.15rem; font-weight: 600; margin: 0 0 .35rem; }
.dropzone-hint { color: var(--muted); margin: 0; font-size: .95rem; }
.privacy-note { margin: .9rem 0 0; padding: .75rem 1rem; border-left: 4px solid var(--ok); background: var(--ok-bg); border-radius: 6px; font-size: .95rem; }

.file-list { list-style: none; padding: 0; margin: 1rem 0 0; }
.file-item { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; padding: .6rem .9rem; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; margin-bottom: .5rem; }
.file-item.has-error { border-color: var(--bad); background: var(--bad-bg); }
.file-name { font-weight: 600; word-break: break-all; flex: 1 1 14rem; }
.file-size { color: var(--muted); }
.file-error { color: var(--bad); flex-basis: 100%; }
.actions { margin-top: 1rem; display: flex; gap: .75rem; flex-wrap: wrap; }
.btn { font: inherit; padding: .6rem 1.2rem; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); cursor: pointer; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.small { padding: .3rem .7rem; font-size: .9rem; }
.status { min-height: 1.5rem; margin: .75rem 0 0; color: var(--muted); }
.status.error { color: var(--bad); font-weight: 600; }

.results h2 { margin-top: .5rem; }
.files-meta { list-style: none; padding: 0; margin: 0 0 1.25rem; color: var(--muted); font-size: .95rem; }
.files-meta li { margin-bottom: .35rem; }
.files-meta .sha { display: block; font-size: .8rem; word-break: break-all; color: var(--muted); }
.pair { background: var(--panel); border: 1px solid var(--line); border-left-width: 6px; border-radius: var(--radius); padding: 1rem 1.25rem; margin-bottom: 1rem; }
.pair.identical { border-left-color: var(--ok); }
.pair.content_identical { border-left-color: var(--warn); }
.pair.different { border-left-color: var(--bad); }
.pair-head { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; }
.pair-title { margin: 0; font-size: 1.05rem; word-break: break-all; }
.badge { display: inline-block; padding: .2rem .7rem; border-radius: 999px; font-weight: 700; font-size: .9rem; }
.identical .badge { background: var(--ok-bg); color: var(--ok); }
.content_identical .badge { background: var(--warn-bg); color: var(--warn); }
.different .badge { background: var(--bad-bg); color: var(--bad); }
.reason { margin: .6rem 0 0; }
.pages-ok { color: var(--ok); margin: .5rem 0 0; }
.pages { list-style: none; padding: 0; margin: .75rem 0 0; }
.page-row { padding: .5rem 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 7rem 1fr; gap: .25rem 1rem; align-items: baseline; }
.page-row.over .page-dev { color: var(--bad); font-weight: 600; }
.page-no { font-weight: 600; }
.diff { grid-column: 1 / -1; }
.diff summary { cursor: pointer; color: var(--accent); }
.diff-img { display: block; max-width: 100%; height: auto; margin-top: .5rem; border: 1px solid var(--line); background: #fff; }

.site-footer { border-top: 1px solid var(--line); margin-top: 2rem; padding: 1.25rem; font-size: .9rem; color: var(--muted); text-align: center; }
.site-footer nav { display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem 1.25rem; margin-bottom: .5rem; }
.site-footer a { color: var(--muted); }

@media (max-width: 40rem) {
  .page-row { grid-template-columns: 1fr; }
  .site-header { padding: .75rem 1rem; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

.note { padding: .6rem .9rem; background: var(--warn-bg); border-left: 4px solid var(--warn); border-radius: 6px; font-size: .95rem; }