:root {
  /* soft, muted, low-saturation light palette: warm off-white paper,
     charcoal-brown ink (never pure black except bold/highlight) */
  --bg: #f2efe8; --card: #f7f5ef; --ink: #4a463f; --ink-strong: #2b2823;
  --muted: #8d877c;
  --accent: #a1705e; --accent-soft: #e9ddd5; --line: #e0dbd0;
  --known: #7d9682; --flag: #c2ad7c; --chip: #e9e5db;
}
:root[data-theme="dark"] {
  /* soft dark: warm charcoal paper, muted bone text — no pure white/black */
  --bg: #22201b; --card: #292620; --ink: #c6c0b3; --ink-strong: #e6e0d2;
  --muted: #8b8577;
  --accent: #bd8a75; --accent-soft: #453730; --line: #383429;
  --known: #8aa890; --flag: #b3a06e; --chip: #343026;
}
b, strong, .hl { color: var(--ink-strong); }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif; }
header { padding: 1rem 1.2rem .6rem; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; background: var(--bg); z-index: 5; }
h1 { margin: 0; font-size: 1.5rem; letter-spacing: .02em; }
h1 .accent { color: var(--accent); }
.subtitle { color: var(--muted); font-size: .8rem; }
.header-row { display: flex; gap: .8rem; align-items: baseline; flex-wrap: wrap; }
.controls { display: flex; gap: .5rem; margin-top: .55rem; flex-wrap: wrap; align-items: center; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.seg button, .tog, .mini { background: var(--card); color: var(--ink); border: none;
  padding: .35rem .8rem; cursor: pointer; font-size: .85rem; }
.seg button.on { background: var(--accent); color: #fff; }
.tog { border: 1px solid var(--line); border-radius: 999px; }
.tog.on { background: var(--accent); color: #fff; border-color: var(--accent); }
#search { flex: 1 1 220px; padding: .45rem .7rem; border: 1px solid var(--line);
  border-radius: 8px; background: var(--card); color: var(--ink); font-size: .95rem; }
select { padding: .45rem .5rem; border: 1px solid var(--line); border-radius: 8px;
  background: var(--card); color: var(--ink); }
.progress-wrap { display: flex; align-items: center; gap: .6rem; margin: .55rem 0 .2rem; font-size: .78rem; color: var(--muted); }
.progress-bar { flex: 1 1 120px; max-width: 260px; height: 6px; background: var(--chip); border-radius: 3px; overflow: hidden; }
#progressFill { height: 100%; width: 0; background: var(--known); transition: width .3s; }
.mini { border: 1px solid var(--line); border-radius: 6px; font-size: .72rem; padding: .2rem .5rem; }

main { max-width: 860px; margin: 0 auto; padding: 1rem 1.2rem 3rem; }
.word-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  margin-bottom: .7rem; overflow: hidden; }
.word-head { display: flex; align-items: center; gap: .9rem; padding: .7rem .9rem; cursor: pointer; }
.rank { min-width: 2.6rem; text-align: center; font-size: .75rem; color: var(--muted); line-height: 1.25; }
.rank b { display: block; font-size: 1rem; color: var(--accent); }
.headword { font-size: 1.55rem; }
.headword rt { font-size: .55rem; color: var(--muted); }
.head-meta { flex: 1; min-width: 0; }
.reading-line { color: var(--muted); font-size: .82rem; }
.pitch { background: var(--chip); border-radius: 4px; padding: 0 .35rem; margin-left: .35rem; font-size: .75rem; }
.gloss { font-size: .95rem; overflow: hidden; text-overflow: ellipsis; }
.badges { display: flex; flex-direction: column; gap: .25rem; align-items: flex-end; }
.badge { font-size: .65rem; padding: .12rem .45rem; border-radius: 999px; background: var(--chip); color: var(--muted); white-space: nowrap; }
.badge.review { background: var(--flag); color: #222; }
.know-btn { border: 1px solid var(--line); background: none; color: var(--muted);
  border-radius: 999px; padding: .25rem .7rem; cursor: pointer; font-size: .78rem; }
.word-card.known .know-btn { background: var(--known); border-color: var(--known); color: #fff; }
.word-card.known .headword { opacity: .55; }

.word-body { display: none; border-top: 1px solid var(--line); padding: .8rem .95rem 1rem; }
.word-card.open .word-body { display: block; }
.sentence { margin: .65rem 0; padding: .6rem .75rem; background: var(--bg); border-radius: 8px; }
.sentence .jp { font-size: 1.08rem; line-height: 2; }
.sentence .jp .hl { color: var(--accent); font-weight: 600; }
.headword, .word { color: var(--ink-strong); }
.sentence .en { color: var(--muted); font-size: .88rem; margin-top: .25rem; }
.sentence .meta { display: flex; gap: .6rem; align-items: center; margin-top: .3rem;
  font-size: .68rem; color: var(--muted); }
.sense-tag { background: var(--accent-soft); color: var(--accent); border-radius: 4px; padding: .05rem .4rem; }
.play { border: none; background: var(--accent); color: white; border-radius: 50%;
  width: 1.7rem; height: 1.7rem; cursor: pointer; font-size: .8rem; flex-shrink: 0; }
.def-block { margin-top: .8rem; }
.def-block h4 { margin: .3rem 0; font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.def-jp-full { display: none; white-space: pre-wrap; font-size: .88rem; line-height: 1.75;
  background: var(--bg); border-radius: 8px; padding: .6rem .75rem; margin-top: .4rem; }
.def-jp-full.open { display: block; }
.expander { background: none; border: none; color: var(--accent); cursor: pointer; font-size: .8rem; padding: 0; }
.kanji-links { margin-top: .7rem; font-size: .8rem; color: var(--muted); }
.kanji-links a { color: var(--accent); text-decoration: none; margin-right: .45rem; font-size: 1rem; }
.src { font-size: .68rem; color: var(--muted); margin-top: .6rem; }
body.no-furi rt { display: none; }
footer { max-width: 860px; margin: 0 auto; padding: 1rem 1.2rem 2.5rem; color: var(--muted); font-size: .72rem; }
footer a { color: var(--accent); }
@media (max-width: 560px) {
  .headword { font-size: 1.3rem; }
  .badges { display: none; }
}