:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #16181d;
  --muted: #5b6270;
  --border: #dde1e7;
  --accent: #0f766e;
  --accent-text: #ffffff;
  --accent-soft: #e6f4f2;
  --error: #b42318;
  --error-soft: #fdecea;
  --warning: #9a6700;
  --warning-soft: #fff6e0;
  --info: #3d5a80;
  --info-soft: #eaf0f7;
  --success: #116b3d;
  --success-soft: #e5f5ec;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(16 24 40 / 0.06), 0 1px 3px rgb(16 24 40 / 0.08);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a20;
    --surface-2: #1f232b;
    --text: #e8eaee;
    --muted: #9aa2b1;
    --border: #2c313b;
    --accent: #2dd4bf;
    --accent-text: #06201d;
    --accent-soft: #10302d;
    --error: #ff8a80;
    --error-soft: #3a1714;
    --warning: #f5c35b;
    --warning-soft: #33280d;
    --info: #9cb8e0;
    --info-soft: #18243a;
    --success: #6ee7a8;
    --success-soft: #0f2f1f;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; } /* otherwise display: flex/grid rules win */

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }

/* --- header ------------------------------------------------------------ */
.top { background: var(--surface); border-bottom: 1px solid var(--border); }
.top-row { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; }
.logo { width: 26px; height: 26px; color: var(--accent); }
.lang { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.lang button {
  border: 0; background: transparent; color: var(--muted);
  padding: 6px 12px; font: inherit; font-size: 14px; cursor: pointer;
}
.lang button[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); }

/* --- hero ------------------------------------------------------------- */
.hero { padding: 36px 0 20px; }
.hero h1 { margin: 0 0 10px; font-size: clamp(24px, 4vw, 32px); line-height: 1.2; letter-spacing: -0.01em; }
.lead { margin: 24px 0 0; color: var(--muted); max-width: 680px; }

.req {
  margin-top: 14px; max-width: 680px;
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface);
}
.req summary { cursor: pointer; padding: 10px 14px; font-weight: 600; color: var(--accent); }
.req-body { padding: 0 16px 6px; }
.req-body h3 { font-size: 15px; margin: 12px 0 4px; }
.req-note { font-weight: 400; color: var(--muted); font-size: 14px; }
.req-body ul { margin: 0 0 8px; padding-left: 20px; }
.req-body li { margin: 3px 0; font-size: 15px; }

/* --- form ------------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.drop {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 32px 16px; text-align: center; cursor: pointer;
  border: 2px dashed var(--border); border-radius: var(--radius);
  background: var(--surface-2);
  transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.drop-icon { width: 36px; height: 36px; color: var(--accent); margin-bottom: 6px; }
.drop-title { font-weight: 600; }
.drop-browse { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.drop-note { color: var(--muted); font-size: 14px; margin-top: 4px; }

.files { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; }
.files li {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px;
}
.files .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.files .size { color: var(--muted); font-size: 14px; white-space: nowrap; }
.files .remove {
  border: 0; background: transparent; color: var(--muted); cursor: pointer;
  font-size: 20px; line-height: 1; padding: 2px 6px; border-radius: 6px;
}
.files .remove:hover { background: var(--surface-2); color: var(--error); }

.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 12px; font-weight: 650; letter-spacing: .03em;
  background: var(--surface-2); color: var(--muted);
}
.badge.glb { background: var(--accent-soft); color: var(--accent); }
.badge.usdz { background: var(--info-soft); color: var(--info); }
.badge.pass { background: var(--success-soft); color: var(--success); }
.badge.fail { background: var(--error-soft); color: var(--error); }

.hint-note { margin: 10px 0 0; font-size: 14px; color: var(--warning); }

.dims { border: 0; margin: 20px 0 0; padding: 0; }
.dims legend { font-weight: 600; padding: 0; }
.dims p { margin: 2px 0 10px; }
.dims-row { display: grid; grid-template-columns: repeat(3, 1fr) 0.8fr; gap: 10px; }
.dims label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
.dims input, .dims select {
  width: 100%; padding: 9px 10px; font: inherit; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
}
.dims input:focus, .dims select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }

.form-error {
  margin: 16px 0 0; padding: 10px 12px; border-radius: 8px;
  background: var(--error-soft); color: var(--error); font-size: 15px;
}

.actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 20px; }
.actions p { margin: 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 18px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 600;
  text-decoration: none; cursor: pointer;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.primary:hover { filter: brightness(1.07); }
.btn:disabled { opacity: .6; cursor: progress; }
.btn.ghost { background: transparent; }
.spinner {
  display: none; width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent;
  animation: spin .8s linear infinite;
}
.busy .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.drop.disabled { opacity: .55; pointer-events: none; }

/* --- progress --------------------------------------------------------- */
.progress { margin-top: 18px; }
.progress-head { display: flex; justify-content: space-between; gap: 12px; font-weight: 600; font-size: 15px; }
.progress-track {
  position: relative; height: 10px; margin: 8px 0 6px; overflow: hidden;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px;
}
.progress-fill {
  height: 100%; width: 0; background: var(--accent); border-radius: 999px;
  transition: width .3s ease;
}
/* While the server checks: a sliding bar, since the duration isn't known. */
.progress.indeterminate .progress-fill {
  width: 35%; position: absolute; left: -35%;
  animation: progress-slide 1.4s ease-in-out infinite;
}
@keyframes progress-slide { to { left: 100%; } }
@media (prefers-reduced-motion: reduce) {
  .progress.indeterminate .progress-fill { animation: none; left: 0; width: 100%; opacity: .5; }
}
.progress-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; min-height: 24px; }
.progress p { margin: 6px 0 0; }
.link-btn {
  border: 0; background: none; padding: 2px 0; font: inherit; font-size: 14px;
  color: var(--accent); text-decoration: underline; text-underline-offset: 3px; cursor: pointer;
}

.muted { color: var(--muted); }
.small { font-size: 14px; }

/* --- results ---------------------------------------------------------- */
.results { margin: 28px 0 12px; display: grid; gap: 16px; }
.summary {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 18px; border-radius: var(--radius); font-weight: 650;
}
.summary.pass { background: var(--success-soft); color: var(--success); }
.summary.fail { background: var(--error-soft); color: var(--error); }
.summary svg { width: 24px; height: 24px; flex: none; }

.report-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.report-head h2 { font-size: 17px; margin: 0; overflow-wrap: anywhere; }
.report-size { margin: 10px 0 0; font-weight: 600; }
.stats { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.stats summary { cursor: pointer; width: fit-content; }
.stats ul { margin: 6px 0 0; padding-left: 18px; columns: 2; column-gap: 24px; }

.findings { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 8px; }
.finding {
  display: grid; grid-template-columns: auto 1fr; gap: 4px 10px;
  padding: 10px 12px; border-radius: 10px; border-left: 4px solid;
}
.finding.error { background: var(--error-soft); border-color: var(--error); }
.finding.warning { background: var(--warning-soft); border-color: var(--warning); }
.finding.info { background: var(--info-soft); border-color: var(--info); }
.sev { font-size: 12px; font-weight: 700; letter-spacing: .04em; padding-top: 2px; white-space: nowrap; }
.finding.error .sev { color: var(--error); }
.finding.warning .sev { color: var(--warning); }
.finding.info .sev { color: var(--info); }
.msg { margin: 0; }
.fix { grid-column: 2; margin: 0; font-size: 14px; color: var(--muted); }
.fix::before { content: "→ "; }
.code { grid-column: 2; font: 12px ui-monospace, SFMono-Regular, Consolas, monospace; color: var(--muted); }
.no-issues { margin: 12px 0 0; color: var(--success); }

.cta { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.cta p { margin: 0; font-weight: 600; }

#again { justify-self: start; }

.foot { padding: 28px 16px 40px; }
.foot p { margin: 4px 0; }

@media (max-width: 600px) {
  .dims-row { grid-template-columns: 1fr 1fr; }
  .stats ul { columns: 1; }
  .card { padding: 16px; }
  .hero { padding-top: 24px; }
}