:root {
  --ink: #123943;
  --ink-soft: #46636a;
  --teal: #103945;
  --teal-2: #1a5360;
  --gold: #b68a3d;
  --gold-light: #d7b96f;
  --paper: #f2e6c9;
  --paper-light: #fbf4e3;
  --paper-dark: #dfc99e;
  --brown: #76562f;
  --danger: #874033;
  --shadow: 0 16px 34px rgba(58, 41, 16, .18);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}
* { box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  margin: 0; min-width: 320px; color: var(--ink);
  background:
    radial-gradient(circle at 10% 4%, rgba(255,255,255,.72), transparent 28%),
    radial-gradient(circle at 90% 1%, rgba(112,91,45,.14), transparent 30%),
    repeating-linear-gradient(93deg, rgba(97,68,26,.025) 0 1px, transparent 1px 5px),
    var(--paper);
  font-family: Georgia, "Times New Roman", "Yu Mincho", "Hiragino Mincho ProN", serif;
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; }
button { color: inherit; }
button:focus-visible, input:focus-visible { outline: 3px solid rgba(26,83,96,.3); outline-offset: 3px; }
.app-shell { min-height: 100dvh; padding-bottom: calc(82px + var(--safe-bottom)); }
.hero {
  position: relative; overflow: hidden; min-height: 158px;
  padding: calc(18px + env(safe-area-inset-top, 0px)) 20px 13px;
  text-align: center; border-bottom: 1px solid rgba(182,138,61,.65);
  background:
    linear-gradient(180deg, rgba(12,52,63,.18), transparent 50%),
    linear-gradient(145deg, rgba(255,255,255,.76), rgba(234,214,172,.58));
}
.hero::before, .hero::after { content: ""; position: absolute; inset: 0; pointer-events: none; }
.hero::before { opacity: .38; background: radial-gradient(ellipse at 2% -5%, rgba(35,69,47,.8), transparent 34%), radial-gradient(ellipse at 98% -10%, rgba(43,76,51,.68), transparent 35%); }
.hero::after { background: linear-gradient(90deg, transparent 5%, rgba(182,138,61,.24) 50%, transparent 95%); }
.hero > * { position: relative; z-index: 1; }
.hero-ornament { display: block; margin-bottom: 3px; color: var(--gold); font-size: 13px; }
.eyebrow, .section-kicker { margin: 0; color: var(--brown); font-size: 10px; font-weight: 700; letter-spacing: .18em; }
.hero h1 { margin: 5px 0 2px; font-size: clamp(34px, 9.5vw, 52px); line-height: 1; font-weight: 500; letter-spacing: -.035em; }
.subtitle { margin: 8px 0 12px; color: var(--brown); font-size: 13px; letter-spacing: .08em; }
.hero-progress { width: min(360px, 90%); margin: auto; display: grid; gap: 7px; color: var(--ink-soft); font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 10px; letter-spacing: .12em; }
.hero-progress-meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.hero-progress-meta span:last-child { color: var(--brown); font-variant-numeric: tabular-nums; }
.progress-track { display: block; width: 82%; height: 4px; margin: 0 auto; border-radius: 99px; overflow: hidden; background: rgba(18,57,67,.13); }
.progress-track > span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--gold), var(--teal-2)); transition: width .35s ease; }
main { width: min(720px, 100%); margin: 0 auto; padding: 21px 15px 8px; }
.view { display: none; }
.view.is-active { display: block; animation: reveal .22s ease; }
@keyframes reveal { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.section-heading h2 { margin: 4px 0 0; font-size: 23px; font-weight: 500; }
.section-note, .gesture-note, .voice-note { color: #6c5f49; font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 12px; line-height: 1.7; }
.section-note { margin: 0 0 16px; }
.count-badge { flex: 0 0 auto; padding: 6px 9px; border: 1px solid rgba(182,138,61,.55); border-radius: 99px; background: rgba(251,244,227,.75); color: var(--brown); font-size: 11px; }
.set-switcher { display: grid; grid-template-columns: 42px minmax(0, 1fr) 42px; gap: 7px; align-items: stretch; margin-bottom: 10px; }
.set-step { border: 1px solid rgba(182,138,61,.45); border-radius: 15px; background: rgba(251,244,227,.68); color: var(--gold); font-size: 31px; line-height: 1; cursor: pointer; }
.set-step:disabled { opacity: .25; cursor: default; }
.current-set-button { min-width: 0; min-height: 62px; padding: 8px 14px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; border: 1px solid rgba(182,138,61,.56); border-radius: 17px; background: rgba(251,244,227,.78); color: var(--ink); cursor: pointer; box-shadow: 0 7px 17px rgba(58,41,16,.08); }
.current-set-button span { color: var(--brown); font-size: 10px; font-weight: 700; letter-spacing: .14em; }
.current-set-button strong { text-align: center; font-size: 20px; font-weight: 500; letter-spacing: .13em; }
.current-set-button small { color: var(--ink-soft); font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 10px; font-variant-numeric: tabular-nums; }
.current-set-button[aria-expanded="true"] { border-color: var(--gold-light); background: var(--teal); color: #f8e9bc; }
.current-set-button[aria-expanded="true"] span, .current-set-button[aria-expanded="true"] small { color: rgba(248,233,188,.76); }
.set-chooser { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; margin: -2px 42px 12px; padding: 8px; border: 1px solid rgba(182,138,61,.34); border-radius: 16px; background: rgba(246,234,205,.9); box-shadow: 0 12px 25px rgba(58,41,16,.12); }
.set-chooser[hidden] { display: none; }
.set-chooser button, .review-scope button { min-width: 0; padding: 9px 8px; border: 1px solid rgba(182,138,61,.42); border-radius: 13px; background: rgba(255,252,243,.74); color: var(--ink); cursor: pointer; text-align: left; transition: .2s ease; }
.set-chooser button span, .review-scope button span { display: block; color: var(--brown); font-size: 9px; font-weight: 700; letter-spacing: .13em; }
.set-chooser button strong, .review-scope button strong { display: block; margin-top: 3px; font-size: 15px; font-weight: 500; letter-spacing: .07em; }
.set-chooser button small, .review-scope button small { display: block; margin-top: 3px; color: var(--ink-soft); font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 9px; }
.set-chooser button.is-active, .review-scope button.is-active { border-color: var(--gold-light); background: var(--teal); color: #f8e9bc; }
.set-chooser button.is-active span, .set-chooser button.is-active small, .review-scope button.is-active span, .review-scope button.is-active small { color: rgba(248,233,188,.78); }
.set-chooser button:disabled { opacity: .48; cursor: default; }
.review-scope { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin-bottom: 12px; }
.letter-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin-bottom: 12px; }
.strip-button { border: 1px solid rgba(182,138,61,.45); border-radius: 13px; padding: 8px 4px; background: rgba(251,244,227,.72); cursor: pointer; font-size: 18px; transition: .2s ease; }
.strip-button.is-active { color: #f8e9bc; border-color: var(--gold-light); background: var(--teal); box-shadow: 0 5px 14px rgba(15,53,65,.2); }
.strip-button.is-mastered::after { content: "✦"; margin-left: 4px; color: var(--gold-light); font-size: 9px; vertical-align: top; }
.study-stage { position: relative; display: grid; grid-template-columns: 34px minmax(0, 1fr) 34px; gap: 7px; align-items: center; }
.side-arrow { height: 60px; padding: 0; border: 0; background: transparent; color: var(--gold); font-size: 42px; cursor: pointer; }
.side-arrow:disabled { opacity: .2; }
.study-card { overflow: hidden; border: 1px solid rgba(160,113,41,.76); border-radius: 25px; background: rgba(251,244,227,.95); box-shadow: var(--shadow); touch-action: pan-y; }
.study-art { position: relative; aspect-ratio: 4 / 5; overflow: hidden; background: #c7b184; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.study-art img { width: 100%; height: 100%; object-fit: cover; object-position: center; display: block; transition: transform .5s ease; }
.study-art:active img { transform: scale(1.015); }
.study-art::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(8,26,30,.04), transparent 54%, rgba(10,30,35,.3)); pointer-events: none; }
.study-letter {
  position: absolute; left: 18px; bottom: 13px; z-index: 2;
  border: 1px solid rgba(246,224,171,.72); border-radius: 16px;
  padding: 7px 13px 4px; background: rgba(15,53,65,.84); color: #f8e8b8;
  font-size: clamp(42px, 13vw, 63px); line-height: 1; text-shadow: 0 2px 8px rgba(0,0,0,.28); cursor: pointer;
}
.study-copy { padding: 19px 20px 20px; text-align: center; }
.study-word { display: inline-block; margin: 0; padding: 2px 9px; border: 0; background: transparent; color: var(--ink); font-size: clamp(34px, 10vw, 48px); line-height: 1.1; cursor: pointer; }
.study-latin { display: inline-block; margin: 5px 0 0; padding: 4px 10px; border: 0; background: transparent; color: var(--brown); font-size: 17px; font-style: italic; cursor: pointer; }
.study-meaning { display: block; margin-top: 5px; color: var(--ink-soft); font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 13px; }
.sound-facts { margin: 17px 0 0; padding: 12px 14px; border-top: 1px solid rgba(182,138,61,.32); border-bottom: 1px solid rgba(182,138,61,.32); text-align: left; }
.sound-facts dl { margin: 0; display: grid; grid-template-columns: 74px 1fr; gap: 7px 12px; font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 12px; line-height: 1.55; }
.sound-facts dt { color: var(--brown); font-weight: 700; }
.sound-facts dd { margin: 0; color: #334f55; }
.status-line { margin: 14px 0 0; display: flex; justify-content: center; align-items: center; gap: 7px; color: var(--brown); font-size: 11px; letter-spacing: .08em; }
.status-laurel { font-size: 18px; color: var(--gold); }
.is-speaking { animation: speakingGlow .8s ease infinite alternate; }
@keyframes speakingGlow { from { filter: drop-shadow(0 0 0 rgba(215,185,111,0)); } to { filter: drop-shadow(0 0 8px rgba(215,185,111,.85)); color: #9b6c1f; } }
.slide-dots { display: flex; justify-content: center; gap: 6px; margin-top: 13px; }
.slide-dots span { width: 6px; height: 6px; border-radius: 50%; background: rgba(18,57,67,.2); }
.slide-dots span.is-active { width: 20px; border-radius: 99px; background: var(--gold); }
.gesture-note { margin: 9px auto 0; max-width: 390px; text-align: center; }
.review-modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px; margin-bottom: 11px; }
.review-modes span { padding: 7px 3px; border-bottom: 2px solid rgba(182,138,61,.2); color: #786b54; text-align: center; font-size: 10px; }
.review-modes span.is-current { border-color: var(--gold); color: var(--teal); font-weight: 700; }
.review-card { overflow: hidden; border: 1px solid rgba(160,113,41,.72); border-radius: 24px; background: rgba(251,244,227,.94); box-shadow: var(--shadow); }
.review-visual { min-height: 260px; display: grid; place-items: center; position: relative; overflow: hidden; background: linear-gradient(145deg, rgba(255,255,255,.6), rgba(218,196,149,.48)); }
.review-visual.image img { width: 100%; height: min(72vw, 410px); object-fit: cover; display: block; }
.review-visual.image::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 -30px 35px rgba(20,30,25,.16); }
.review-case-letter { font-size: 132px; color: var(--teal); line-height: 1; text-shadow: 0 5px 0 rgba(182,138,61,.13); }
.audio-orb { width: 142px; height: 142px; border: 1px solid var(--gold-light); border-radius: 50%; background: radial-gradient(circle at 35% 28%, #245e68, var(--teal) 64%); color: #f8e5ae; box-shadow: 0 15px 30px rgba(15,53,65,.23), inset 0 0 0 8px rgba(215,185,111,.09); cursor: pointer; }
.audio-orb span { display: block; font-size: 33px; }
.audio-orb small { display: block; margin-top: 7px; font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 11px; letter-spacing: .12em; }
.review-body { padding: 18px; }
.review-type { margin: 0 0 5px; color: var(--gold); font-size: 10px; letter-spacing: .16em; font-weight: 700; }
.review-prompt { margin: 0 0 14px; color: var(--ink); font-size: 16px; line-height: 1.55; }
.choice-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 9px; }
.choice-button { min-height: 58px; border: 1px solid rgba(160,113,41,.52); border-radius: 15px; background: rgba(255,252,243,.76); color: var(--ink); font-size: 25px; cursor: pointer; }
.choice-button.is-correct { border-color: #4e795a; background: #dce8d8; color: #2f6242; }
.choice-button.is-wrong { border-color: #9b4c3d; background: #edd8cf; color: #853a30; }
.review-feedback { min-height: 42px; margin: 14px 0 0; color: var(--brown); font-size: 13px; line-height: 1.55; }
.primary-button, .outline-button { width: 100%; min-height: 48px; border-radius: 14px; padding: 10px 15px; cursor: pointer; }
.primary-button { border: 1px solid #0e3038; background: var(--teal); color: #f7e4ad; box-shadow: 0 8px 17px rgba(15,53,65,.18); }
.outline-button { border: 1px solid rgba(128,82,30,.52); background: transparent; color: var(--brown); }
.next-button { margin-top: 3px; }
.completion-panel { padding: 42px 22px; text-align: center; }
.completion-wreath { font-size: 72px; color: var(--gold); }
.completion-panel h3 { margin: 10px 0 7px; font-size: 26px; font-weight: 500; }
.completion-panel p { color: var(--brown); line-height: 1.7; font-size: 13px; }
.alphabet-garden { display: grid; grid-template-columns: repeat(4, 1fr); gap: 9px; }
.garden-letter { position: relative; aspect-ratio: 1; display: grid; place-items: center; border: 1px solid rgba(160,113,41,.38); border-radius: 50%; background: rgba(251,244,227,.66); color: rgba(18,57,67,.35); font-size: 27px; }
.garden-letter.is-current-set { color: var(--ink); }
.garden-letter::before, .garden-letter::after { position: absolute; bottom: 7px; color: transparent; font-size: 13px; transition: .25s; }
.garden-letter::before { content: "❧"; left: 10px; transform: rotate(18deg); }
.garden-letter::after { content: "❧"; right: 10px; transform: scaleX(-1) rotate(18deg); }
.garden-letter.status-viewed { border-color: rgba(182,138,61,.6); }
.garden-letter.status-viewed::before { color: rgba(182,138,61,.55); }
.garden-letter.status-heard { border-color: var(--gold); box-shadow: inset 0 0 0 3px rgba(215,185,111,.12); }
.garden-letter.status-heard::before, .garden-letter.status-heard::after { color: var(--gold); }
.garden-letter.status-mastered { color: #f7e5b2; border-color: var(--gold-light); background: var(--teal); box-shadow: 0 8px 17px rgba(15,53,65,.2); }
.garden-letter.status-mastered::before, .garden-letter.status-mastered::after { color: var(--gold-light); }
.legend { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; margin: 16px 0; color: #6f624b; font-size: 11px; }
.legend span { display: flex; align-items: center; gap: 5px; }
.legend-dot { width: 9px; height: 9px; border: 1px solid var(--gold); border-radius: 50%; }
.legend-dot.viewed { background: rgba(182,138,61,.22); }
.legend-dot.heard { background: var(--gold); }
.legend-dot.mastered { background: var(--teal); }
.progress-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 9px; margin-bottom: 15px; }
.progress-summary div { padding: 13px 5px; border: 1px solid rgba(182,138,61,.34); border-radius: 15px; background: rgba(251,244,227,.58); text-align: center; }
.progress-summary strong { display: block; font-size: 26px; font-weight: 500; }
.progress-summary span { color: var(--brown); font-size: 10px; }
.settings-panel { padding: 19px; border: 1px solid rgba(160,113,41,.55); border-radius: 22px; background: rgba(251,244,227,.75); box-shadow: var(--shadow); }
.setting-row, .switch-row { display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.setting-row strong, .switch-row strong { display: block; font-size: 15px; }
.setting-row small, .switch-row small { display: block; margin-top: 4px; color: #766951; font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 11px; }
#speechRate { width: 100%; margin: 16px 0 23px; accent-color: var(--teal); }
#speechRateValue { color: var(--brown); }
.switch { position: relative; flex: 0 0 auto; width: 49px; height: 29px; }
.switch input { position: absolute; opacity: 0; }
.switch-ui { position: absolute; inset: 0; border-radius: 99px; background: #b8ad96; transition: .2s; }
.switch-ui::after { content: ""; position: absolute; top: 3px; left: 3px; width: 23px; height: 23px; border-radius: 50%; background: white; box-shadow: 0 2px 6px rgba(0,0,0,.2); transition: .2s; }
.switch input:checked + .switch-ui { background: var(--teal-2); }
.switch input:checked + .switch-ui::after { transform: translateX(20px); }
.settings-panel .primary-button { margin-top: 23px; }
.voice-note { margin: 10px 2px 0; }
.danger { margin-top: 3px; color: var(--danger); border-color: rgba(135,64,51,.45); }
.bottom-nav { position: fixed; z-index: 20; left: 0; right: 0; bottom: 0; min-height: calc(72px + var(--safe-bottom)); padding: 7px 7px var(--safe-bottom); display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(215,185,111,.58); background: rgba(15,53,65,.97); box-shadow: 0 -8px 25px rgba(17,35,38,.16); backdrop-filter: blur(14px); }
.nav-item { min-width: 0; border: 0; background: transparent; color: rgba(244,223,169,.63); display: grid; place-items: center; align-content: center; gap: 2px; font-size: 10px; cursor: pointer; }
.nav-item.is-active { color: #f9e7b7; }
.nav-icon { font-size: 22px; line-height: 1; }
.toast { position: fixed; z-index: 30; left: 50%; bottom: calc(90px + var(--safe-bottom)); transform: translate(-50%, 15px); width: max-content; max-width: calc(100% - 34px); padding: 10px 15px; border: 1px solid rgba(215,185,111,.45); border-radius: 99px; background: rgba(15,53,65,.94); color: #f7e3ac; font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; font-size: 12px; opacity: 0; pointer-events: none; transition: .23s; }
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }
.hide-japanese .study-meaning { display: none; }
@media (min-width: 620px) {
  .study-stage { grid-template-columns: 48px minmax(0, 1fr) 48px; }
  .study-card { max-width: 520px; margin: auto; }
  .alphabet-garden { grid-template-columns: repeat(6, 1fr); }
  .set-chooser { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .review-scope { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 365px) {
  .study-stage { grid-template-columns: 25px minmax(0, 1fr) 25px; gap: 3px; }
  .study-copy { padding-left: 14px; padding-right: 14px; }
  .sound-facts dl { grid-template-columns: 67px 1fr; }
}

@media (max-width: 365px) {
  .set-chooser { margin-left: 30px; margin-right: 30px; }
  .current-set-button { grid-template-columns: auto 1fr auto; gap: 7px; padding-left: 10px; padding-right: 10px; }
  .current-set-button strong { font-size: 18px; letter-spacing: .08em; }
  .set-chooser button, .review-scope button { padding: 8px 5px; border-radius: 13px; }
  .set-chooser button span, .review-scope button span { font-size: 8px; letter-spacing: .08em; }
  .set-chooser button strong, .review-scope button strong { font-size: 13px; letter-spacing: .035em; }
  .set-chooser button small, .review-scope button small { font-size: 9px; }
}

/* v3 compact cleanup: remove redundant set grid and letter strip in LEARN */
#learnView .set-chooser,
#learnView .letter-strip {
  display: none !important;
}
#learnView .study-stage {
  margin-top: 10px;
}


/* v4 review range: compact 12-letter front/back selector */
.review-half-toggle {
  max-width: 430px;
  margin: -2px auto 12px;
  padding: 4px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  border: 1px solid rgba(182,138,61,.34);
  border-radius: 15px;
  background: rgba(239,225,191,.62);
}
.review-half-toggle[hidden] { display: none; }
.review-half-toggle button {
  min-width: 0;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: 11px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  text-align: center;
  transition: .2s ease;
}
.review-half-toggle button span {
  display: inline-block;
  margin-right: 6px;
  color: var(--brown);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .12em;
}
.review-half-toggle button strong {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
}
.review-half-toggle button small {
  display: block;
  margin-top: 2px;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif;
  font-size: 9px;
}
.review-half-toggle button.is-active {
  border-color: var(--gold-light);
  background: var(--teal);
  color: #f8e9bc;
  box-shadow: 0 5px 12px rgba(15,53,65,.13);
}
.review-half-toggle button.is-active span { color: rgba(248,233,188,.78); }