:root {
  --bg: #eef5fc;
  --card: #ffffff;
  --ink: #1d2b3a;
  --muted: #6b7c8f;
  --accent: #128afa;
  --good: #1fa463;
  --bad: #e5484d;
  --line: #d6e3f0;
  --stage: radial-gradient(circle at 50% 45%, #ffffff 0%, #dceafa 100%);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1722;
    --card: #172231;
    --ink: #e6eef7;
    --muted: #8fa1b5;
    --line: #2a3a4f;
    --stage: radial-gradient(circle at 50% 45%, #2a3d55 0%, #142030 100%);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap { max-width: 560px; margin: 0 auto; padding: 24px 16px 40px; }
header { text-align: center; margin-bottom: 16px; }
h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; }
h1 span { color: var(--accent); }
.sub { margin: 4px 0 0; color: var(--muted); font-size: 0.9rem; }

.options { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: center; margin-bottom: 14px; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }
.chip {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  padding: 5px 12px; border-radius: 999px; cursor: pointer; font-size: 0.85rem;
}
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.toggle { font-size: 0.85rem; color: var(--muted); display: flex; align-items: center; gap: 6px; cursor: pointer; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 16px; }
.stage {
  background: var(--stage); border-radius: 12px; height: 260px;
  display: grid; place-items: center; overflow: hidden;
}
.stage > * { grid-area: 1 / 1; }
.stage.loading img { visibility: hidden; }
.loader { display: none; align-items: center; gap: 10px; color: var(--muted); font-size: 0.9rem; }
.stage.loading .loader { display: flex; }
.spinner {
  width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid var(--line); border-top-color: var(--accent);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#preloadBtn:disabled { opacity: .6; cursor: default; }
.stage img { max-width: 80%; max-height: 220px; user-select: none; transition: filter .35s ease, transform .35s ease; }
.stage.hard img { filter: brightness(0); }
.stage.hard.revealed img { filter: none; }
.stage.revealed img { transform: scale(1.04); }

.reveal { min-height: 1.6em; text-align: center; font-weight: 600; margin: 12px 0 8px; }
.reveal.good { color: var(--good); }
.reveal.bad { color: var(--bad); }
.reveal small { display: block; font-weight: 400; color: var(--muted); }

form { display: flex; gap: 8px; }
.ac { position: relative; flex: 1; }
input[type="text"] {
  width: 100%; padding: 10px 12px; font-size: 1rem; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
input[type="text"]:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
#suggest {
  position: absolute; left: 0; right: 0; top: calc(100% + 4px); z-index: 5;
  list-style: none; margin: 0; padding: 4px; background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; max-height: 220px; overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,.12);
}
#suggest:empty { display: none; }
#suggest li { padding: 7px 10px; border-radius: 6px; cursor: pointer; }
#suggest li[aria-selected="true"], #suggest li:hover { background: var(--accent); color: #fff; }

button {
  padding: 10px 16px; font-size: 1rem; border-radius: 10px; border: 0;
  background: var(--accent); color: #fff; cursor: pointer; font-weight: 600;
}
button:disabled { opacity: .45; cursor: default; }
button.ghost { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.next { width: 100%; margin-top: 4px; }

[hidden] { display: none !important; }
.summary { text-align: center; padding: 18px 8px 6px; }
.summary h2 { margin: 0 0 4px; font-size: 1.4rem; }
.summary .big { font-size: 1.15rem; font-weight: 600; margin: 0 0 12px; }
.summary .missed { color: var(--muted); font-size: 0.9rem; margin: 0 0 16px; }
.summary .missed strong { color: var(--ink); }
.summary button { display: block; width: 100%; margin-top: 8px; }
.restart { text-align: center; margin: 8px 0 0; }
button.link { background: none; color: var(--muted); font-weight: 400; font-size: 0.85rem; padding: 4px 8px; text-decoration: underline; }
.scores { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 14px; text-align: center; }
.scores div { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 4px; }
.scores span { display: block; font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.scores small { color: var(--muted); }
#accuracy.rated { color: hsl(var(--hue) 75% 32%); transition: color .3s ease; }
@media (prefers-color-scheme: dark) {
  #accuracy.rated { color: hsl(var(--hue) 70% 60%); }
}

footer { margin-top: 24px; text-align: center; font-size: 0.78rem; color: var(--muted); }
footer a { color: inherit; }

@media (max-width: 420px) {
  .scores { grid-template-columns: repeat(2, 1fr); }
  form { flex-wrap: wrap; }
  .ac { flex-basis: 100%; }
  form button { flex: 1; }
}