:root {
  --bg: #f7f4ef; --surface: #ffffff; --text: #1f1d1a; --muted: #7a746b; --line: #e6e0d6;
  --accent: #c0392b; --accent-soft: #f6e1de; --good: #2e7d4f; --good-soft: #dff1e6; --bad: #b3261e; --bad-soft: #fbe3e1;
  --warn: #9a6b00; --warn-soft: #fbf0d4; --kata: #2c5d8f; --kata-soft: #e0ebf6;
  --m1: #f2b8b2; --m2: #f5d78a; --m3: #a9d9b9; --m4: #4f9d6c;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161514; --surface: #211f1d; --text: #ece7df; --muted: #9a938a; --line: #34312d;
    --accent: #e0604f; --accent-soft: #3a2421; --good: #6ccf94; --good-soft: #1d3326; --bad: #f08a80; --bad-soft: #3a2220;
    --warn: #e8c15a; --warn-soft: #3a3020; --kata: #82b1e3; --kata-soft: #1e2b3a;
    --m1: #7a3a34; --m2: #7a6326; --m3: #2f6b46; --m4: #4fb37a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.5 Inter, system-ui, sans-serif; }
.jp, [lang="ja"] { font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif; }
header { display: flex; align-items: center; justify-content: space-between; gap: 12px; max-width: 920px; margin: 0 auto; padding: 16px 16px 4px; }
h1 { font-size: 1.35rem; margin: 0; } h1 .jp { color: var(--accent); }
.session { display: flex; gap: 12px; color: var(--muted); font-size: .9rem; font-variant-numeric: tabular-nums; }
nav { display: flex; gap: 4px; max-width: 920px; margin: 0 auto; padding: 8px 16px; overflow-x: auto; }
nav button { border: 0; background: none; color: var(--muted); padding: 8px 12px; border-radius: 999px; font: inherit; cursor: pointer; white-space: nowrap; }
nav button.on { background: var(--text); color: var(--bg); }
main { max-width: 920px; margin: 0 auto; padding: 8px 16px 64px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-top: 12px; }
.muted { color: var(--muted); }

details#controls { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 16px; }
details#controls summary { cursor: pointer; font-weight: 600; padding: 4px 0; }
details#controls summary .muted { font-weight: 400; font-size: .85rem; margin-left: 8px; }
.ctl { display: flex; gap: 12px; align-items: flex-start; padding: 6px 0; }
.ctl > label { width: 72px; flex: none; color: var(--muted); font-size: .85rem; padding-top: 6px; }
.ctl.opts { flex-wrap: wrap; align-items: center; gap: 8px 18px; padding-left: 84px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--line); background: var(--bg); color: var(--text); padding: 6px 12px; border-radius: 999px; cursor: pointer; font: inherit; font-size: .9rem; }
.chip.sm { padding: 4px 10px; font-size: .82rem; }
.chip.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip.ghost { border-style: dashed; background: none; }
.check { display: inline-flex; gap: 6px; align-items: center; font-size: .9rem; cursor: pointer; }

#card { text-align: center; min-height: 320px; }
.prompt-label { color: var(--muted); font-size: .9rem; }
.tag { font-size: .75rem; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); margin-left: 4px; }
.tag.k { background: var(--kata-soft); color: var(--kata); }
.big { font-size: clamp(4.5rem, 18vw, 7.5rem); line-height: 1.2; margin: 8px 0 16px; }
.big.word { font-size: clamp(3rem, 12vw, 5rem); letter-spacing: .05em; }
.big.romaji { font-size: clamp(2.6rem, 10vw, 4rem); font-weight: 600; letter-spacing: .04em; margin-bottom: 4px; }
.hint { font-size: 1.15rem; margin-bottom: 16px; }
form#ans { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.answer { font: inherit; font-size: 1.2rem; padding: 10px 14px; border-radius: 10px; border: 2px solid var(--line); background: var(--bg); color: var(--text); width: 220px; text-align: center; }
.answer:focus { outline: none; border-color: var(--accent); }
.answer.fr { width: 240px; font-size: 1rem; }
.answer.jp { font-size: 1.5rem; width: 260px; }
.answer.sm { font-size: .95rem; width: auto; min-width: 240px; text-align: left; padding: 8px 12px; }
.answer[readonly] { opacity: .7; }
.btn { font: inherit; padding: 10px 18px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--text); cursor: pointer; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn.danger { color: var(--bad); border-color: var(--bad); }
.empty { color: var(--muted); padding: 60px 0; }

#feedback { margin-top: 16px; display: flex; flex-direction: column; align-items: center; gap: 8px; }
#feedback:empty { display: none; }
.verdict { font-weight: 600; padding: 4px 14px; border-radius: 999px; }
.verdict.good { background: var(--good-soft); color: var(--good); }
.verdict.almost { background: var(--warn-soft); color: var(--warn); }
.verdict.bad { background: var(--bad-soft); color: var(--bad); }
.solution { font-size: 1.6rem; display: flex; align-items: center; gap: 12px; }
.solution .ro { font-weight: 600; }
.speak { border: 0; background: none; font-size: 1.3rem; cursor: pointer; padding: 4px; }
.no-voice .speak, .voice-missing { display: none; }
.no-voice .voice-missing { display: inline; }
.breakdown { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; }
.breakdown > span { display: flex; flex-direction: column; align-items: center; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 4px 10px; min-width: 44px; }
.breakdown .jp { font-size: 1.3rem; } .breakdown small { color: var(--muted); }
.fr-line { font-size: 1.1rem; } .fr-line.good b { color: var(--good); } .fr-line.bad b { color: var(--bad); }
.note { background: var(--warn-soft); color: var(--warn); padding: 6px 12px; border-radius: 8px; font-size: .92rem; }
.anchor { background: var(--accent-soft); padding: 6px 12px; border-radius: 8px; font-size: .95rem; }
.look { font-size: .9rem; color: var(--muted); }
.look .jp, .anchor .jp { font-size: 1.15em; }
#feedback .btn { margin-top: 6px; }

.kb { margin: 14px auto 0; max-width: 100%; overflow-x: auto; padding-bottom: 4px; }
.kb-grid { display: grid; grid-template-columns: repeat(15, minmax(36px, 1fr)); gap: 4px; min-width: 580px; }
.kb-row { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; justify-content: center; }
.key { font: inherit; font-family: "Noto Sans JP", sans-serif; font-size: 1.15rem; height: 40px; min-width: 36px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); cursor: pointer; }
.key:hover { border-color: var(--accent); } .key:active { background: var(--accent-soft); }
.key.dk { background: var(--surface); }
.key.small { font-size: .9rem; }
.key.wide { padding: 0 14px; font-family: Inter, sans-serif; font-size: .9rem; }
.key.empty { border: 0; background: none; cursor: default; }

.seg-table { margin-bottom: 8px; }
.legend { font-size: .85rem; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; }
.m-new { background: var(--line); } .m1 { background: var(--m1); } .m2 { background: var(--m2); } .m3 { background: var(--m3); } .m4 { background: var(--m4); }
.tgroup h3 { font-size: .85rem; color: var(--muted); margin: 16px 0 6px; font-weight: 600; }
.tcells { display: flex; flex-wrap: wrap; gap: 6px; }
.tcell { position: relative; width: 64px; height: 68px; border: 0; border-radius: 10px; cursor: pointer; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text); font: inherit; }
.tcell .jp { font-size: 1.6rem; line-height: 1.1; } .tcell small { font-size: .75rem; opacity: .8; }
.tcell.m4 { color: #fff; }
.wdot { position: absolute; top: 6px; right: 6px; width: 7px; height: 7px; border-radius: 50%; background: #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.25); }
.detail-head { display: flex; align-items: center; gap: 16px; }
.big-d { font-size: 3.5rem; line-height: 1; }
.detail > * + * { margin-top: 10px; }

.word-tools { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; margin-bottom: 10px; }
#word-list { display: flex; flex-direction: column; gap: 4px; }
.wrow { display: grid; grid-template-columns: 32px 1.2fr 1fr 2fr .8fr 12px; gap: 10px; align-items: center; text-align: left; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; cursor: pointer; font: inherit; color: var(--text); }
.wrow .jp { font-size: 1.2rem; } .wrow .ro { color: var(--muted); } .wrow .kj { color: var(--muted); }
@media (max-width: 640px) {
  .wrow { grid-template-columns: 28px 1fr 1fr 12px; }
  .wrow .ro, .wrow .kj { display: none; }
  .ctl { flex-direction: column; gap: 4px; } .ctl > label { width: auto; padding: 0; } .ctl.opts { padding-left: 0; }
  .card { padding: 16px; }
  .answer, .answer.fr, .answer.jp { width: 100%; }
}

.prose { text-align: left; } .prose h2 { font-size: 1.15rem; margin: 22px 0 8px; } .prose h2:first-child { margin-top: 0; }
.roadmap li { margin-bottom: 8px; }
.rules { display: grid; grid-template-columns: max-content 1fr; gap: 8px 16px; }
.rules dt { font-size: 1.2rem; } .rules dd { margin: 0; }
.prose li { margin-bottom: 6px; }
.code-line code { font-size: 1.3rem; background: var(--bg); padding: 4px 10px; border-radius: 8px; letter-spacing: .1em; }
.inline-form { display: flex; gap: 8px; flex-wrap: wrap; }