:root {
  --bg: #f7f3ec; --surface: #fffdf9; --ink: #1f1a17; --muted: #6b625a; --line: #e4dccf;
  --simp: #0f6e66; --simp-bg: #e3f2ef; --trad: #a8261b; --trad-bg: #f8e6e2; --accent: #a8261b;
  --hz-simp: "Noto Serif SC", "Songti SC", serif; --hz-trad: "Noto Serif TC", "Songti TC", serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #171412; --surface: #211d1a; --ink: #f1ebe3; --muted: #a59a8f; --line: #3a332d;
    --simp: #5cc8bb; --simp-bg: #173431; --trad: #f08a7c; --trad-bg: #3d1f1b; --accent: #f08a7c;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #171412; --surface: #211d1a; --ink: #f1ebe3; --muted: #a59a8f; --line: #3a332d;
  --simp: #5cc8bb; --simp-bg: #173431; --trad: #f08a7c; --trad-bg: #3d1f1b; --accent: #f08a7c;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 "Source Serif 4", Georgia, serif; }
main { max-width: 1040px; margin: 0 auto; padding: 40px 16px 64px; }
[lang="zh-Hans"] { font-family: var(--hz-simp); }
[lang="zh-Hant"] { font-family: var(--hz-trad); }

h1 { font-size: clamp(1.9rem, 5vw, 2.8rem); margin: 0 0 .4rem; letter-spacing: -.01em; }
h1 span { color: var(--accent); }
.lede { max-width: 62ch; color: var(--muted); margin: 0 0 1rem; }
.legend { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem .6rem; font-size: .9rem; color: var(--muted); }
.diff-sample { text-decoration: underline 2px var(--accent); text-underline-offset: 4px; color: var(--ink); }

.tag { display: inline-grid; place-items: center; width: 1.6em; height: 1.6em; border-radius: 6px; font-size: .85rem; font-weight: 700; }
.tag.simp { color: var(--simp); background: var(--simp-bg); }
.tag.trad { color: var(--trad); background: var(--trad-bg); }

form { display: grid; align-items: end; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin: 28px 0 20px; }
label { display: grid; gap: 4px; font-size: .9rem; color: var(--muted); }
small { font-size: .8rem; }
input, select, button { font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
form input { font-size: 1.3rem; font-family: var(--hz-trad); }
input:focus-visible, select:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
button { cursor: pointer; }
button:hover { border-color: var(--muted); }

.gens { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.note { color: var(--muted); margin: 10px 0 0; }
.note.ok { color: var(--simp); font-weight: 600; }
.child { border-style: dashed; display: grid; align-content: start; }
.next { font-size: 1.5rem; margin: .4rem 0 0; font-family: var(--hz-trad); }
.next strong { color: var(--accent); }

#controls { display: grid; gap: 16px; margin: 28px 0 8px; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
#controls[hidden], [hidden] { display: none !important; }
fieldset { border: 0; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
legend, .label { font-size: .9rem; color: var(--muted); margin: 0 0 6px; padding: 0; }
fieldset label { display: flex; align-items: center; gap: 6px; color: var(--ink); font-size: 1rem; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { display: inline-flex; align-items: baseline; gap: 4px; border-radius: 999px; padding: 6px 14px; }
.chip span { font-size: 1.25rem; }
.chip .simp { color: var(--simp); } .chip .trad { color: var(--trad); }
.chip small { color: var(--muted); }
.chip[aria-pressed="true"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.row-ctl { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; }
.grow { flex: 1 1 260px; }

.count { color: var(--muted); font-size: .9rem; margin: 20px 0 8px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; }
.cap { margin: 0 0 6px; font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.card .row { display: flex; align-items: center; gap: 10px; }
.card .hz { font-size: 1.75rem; font-weight: 700; letter-spacing: .06em; }
.row.simp .hz { color: var(--simp); }
.row.trad .hz { color: var(--trad); }
.hz .d { text-decoration: underline 2px; text-underline-offset: 5px; }
.py { margin: 6px 0 0; font-weight: 600; }
.mean { margin: 2px 0 0; color: var(--muted); font-size: .9rem; }
.flow { margin: 6px 0 0; color: var(--accent); font-size: .85rem; letter-spacing: .1em; }
.flow span { color: var(--muted); letter-spacing: 0; }
#more { display: block; margin: 20px auto 0; }
footer { margin-top: 48px; color: var(--muted); font-size: .85rem; max-width: 62ch; }