:root {
  --bg: #faf7f2;
  --ink: #1f1d1a;
  --muted: #6b665e;
  --card: #ffffff;
  --card-edge: #e6e0d6;
  --accent: #b5352b;
  --accent-soft: #f6e4e1;
  --ring: #d9d2c5;
  --wheel: min(92vw, 76vh);
  --card-w: 8.5rem;
  --font-ja: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", "Noto Serif CJK JP", serif;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171513;
    --ink: #f0ebe3;
    --muted: #a39d93;
    --card: #23201d;
    --card-edge: #3a352f;
    --accent: #e0655b;
    --accent-soft: #3b2522;
    --ring: #3a352f;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}
[lang="ja"] { font-family: var(--font-ja); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.top { text-align: center; padding: 1.5rem 1rem 0.5rem; width: 100%; max-width: 50rem; }
.brand { margin: 0 0 1rem; font-weight: 500; font-size: 1.6rem; letter-spacing: 0.02em; }
.brand-ja { color: var(--muted); font-size: 1.1rem; font-weight: 400; margin-left: 0.5rem; }
.brand-ja::before { content: "·"; margin-right: 0.5rem; }
.nav { display: flex; justify-content: center; gap: 0.25rem; margin: -0.5rem 0 0.9rem; font-size: 0.8rem; }
.nav a { color: var(--muted); text-decoration: none; padding: 0.2rem 0.7rem; border-radius: 999px; border: 1px solid transparent; }
.nav a:hover { color: var(--ink); border-color: var(--card-edge); }
.nav a.active { color: var(--accent); border-color: var(--accent); }

.lookup { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.lookup input {
  width: 6rem; height: 3.6rem; font-size: 2.2rem; text-align: center;
  border: 2px solid var(--card-edge); border-radius: 0.6rem; background: var(--card); color: var(--ink);
}
.lookup input:focus { outline: none; border-color: var(--accent); }
.lookup button {
  height: 3.6rem; padding: 0 1.4rem; font-size: 1rem; border: 0; border-radius: 0.6rem;
  background: var(--accent); color: #fff; cursor: pointer;
}
.lookup button:disabled { opacity: 0.5; cursor: default; }
.lookup button.secondary { background: transparent; color: var(--ink); border: 2px solid var(--card-edge); }
.lookup button.secondary:not(:disabled):hover { border-color: var(--accent); color: var(--accent); }
.mode { display: inline-flex; align-items: center; gap: 0.4rem; margin-left: 0.5rem; font-size: 0.85rem; color: var(--muted); cursor: pointer; user-select: none; }
.mode input { accent-color: var(--accent); width: 1rem; height: 1rem; margin: 0; }
.mode:hover { color: var(--ink); }
.hint { color: var(--muted); font-size: 0.9rem; min-height: 1.3em; margin: 0.6rem 0 0; }
.hint.error { color: var(--accent); }

.stage { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; padding: 0.5rem 0 1rem; }
.stage[hidden] { display: none; }

.wheel { position: relative; width: var(--wheel); height: var(--wheel); }
.ring {
  position: absolute; inset: calc(var(--card-w) / 2); border-radius: 50%;
  border: 1px dashed var(--ring);
}

.hub {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  text-align: center; width: calc(var(--wheel) * 0.42);
}
.hub .glyph { font-size: clamp(4rem, calc(var(--wheel) * 0.2), 9rem); line-height: 1; color: var(--accent); }
.details .readings { margin-top: 0.4rem; font-size: 0.95rem; }
.details .readings span + span::before { content: "·"; color: var(--muted); margin: 0 0.35em; }
.details .meanings { color: var(--muted); font-size: 0.85rem; margin-top: 0.2rem; }
.details .meta { color: var(--muted); font-size: 0.7rem; margin-top: 0.3rem; letter-spacing: 0.03em; text-transform: uppercase; }
.details-below { text-align: center; max-width: 24rem; padding: 0 1rem; }
.details-below .details { font-size: 1.05rem; }
.details-below .meanings { font-size: 1rem; }
.details-below .part small { display: block; }

.parts { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.3rem 0.6rem; margin-top: 0.6rem; }
.part { display: inline-flex; flex-direction: column; align-items: center; line-height: 1.15; }
.part > span, .part > a { font-size: 1.25rem; color: var(--ink); text-decoration: none; }
.part > a { border-bottom: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); }
.part > a:hover { color: var(--accent); border-color: var(--accent); }
.part small { font-size: 0.62rem; color: var(--muted); max-width: 5.5rem; text-align: center; }
@media (max-width: 600px) { .hub .part small { display: none; } }

.cross { display: inline-block; margin-top: 0.6rem; font-size: 0.78rem; color: var(--muted); text-decoration: none; border-bottom: 1px solid var(--card-edge); }
.cross:hover { color: var(--accent); border-color: var(--accent); }

.spokes { list-style: none; margin: 0; padding: 0; }
.spoke {
  --angle: 0deg;
  --radius: calc(var(--wheel) / 2 - var(--card-w) / 2);
  position: absolute; left: 50%; top: 50%; width: var(--card-w);
  transform: translate(-50%, -50%) rotate(var(--angle)) translate(var(--radius)) rotate(calc(-1 * var(--angle)));
  background: var(--card); border: 1px solid var(--card-edge); border-radius: 0.7rem;
  padding: 0.5rem 0.6rem; text-align: center; box-shadow: 0 1px 2px rgb(0 0 0 / 0.05);
  animation: pop 0.35s ease both; animation-delay: calc(var(--i) * 40ms);
  cursor: default;
}
.spoke:hover { border-color: var(--accent); background: var(--accent-soft); }
.spoke.open { z-index: 2; border-color: var(--accent); background: var(--card); box-shadow: 0 6px 20px rgb(0 0 0 / 0.25); width: calc(var(--card-w) * 1.35); }
.spoke.open .meaning { display: block; -webkit-line-clamp: unset; overflow: visible; }
.spoke .word { font-size: 1.45rem; line-height: 1.2; }
.spoke .word b { font-weight: 600; color: var(--accent); }
.spoke .word a.k {
  color: inherit; text-decoration: none; border-bottom: 2px solid color-mix(in srgb, var(--accent) 45%, transparent); border-radius: 2px;
  transition: background 0.15s, border-color 0.15s;
}
.spoke .word a.k:hover, .spoke .word a.k:focus-visible { background: var(--accent); border-color: var(--accent); color: #fff; outline: none; }
.spoke .reading { font-size: 0.8rem; color: var(--muted); margin-top: 0.1rem; }
.spoke .meaning {
  font-size: 0.72rem; margin-top: 0.25rem; line-height: 1.25;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
@keyframes pop {
  from { opacity: 0; transform: translate(-50%, -50%) rotate(var(--angle)) translate(calc(var(--radius) * 0.7)) rotate(calc(-1 * var(--angle))); }
  to   { opacity: 1; }
}

.controls { display: flex; gap: 0.6rem; align-items: center; color: var(--muted); font-size: 0.85rem; }
.controls button {
  background: transparent; border: 1px solid var(--card-edge); color: var(--ink);
  border-radius: 999px; padding: 0.35rem 0.9rem; cursor: pointer; font-size: 0.85rem;
}
.controls button:hover { border-color: var(--accent); }

.foot { margin-top: auto; padding: 1rem; color: var(--muted); font-size: 0.72rem; text-align: center; }
.foot a { color: inherit; }

@media (max-width: 600px) {
  :root { --card-w: 6.2rem; --wheel: min(96vw, 70vh); }
  .spoke .word { font-size: 1.15rem; }
  .spoke .meaning { display: none; }
  .spoke.open .word { font-size: 1.45rem; }
}