:root{color-scheme:light;--bg:#f7faf9;--surface:#fff;--ink:#183138;--muted:#536d73;--accent:#167d86;--tint:#e9f4f2;--line:#dae6e4;--shadow:0 8px 30px #173e3610;--good:#18754e;--bad:#ae3e47;--font:16px}
:root[data-theme=dark]{color-scheme:dark;--bg:#101c29;--surface:#182838;--ink:#edf5f6;--muted:#afc4cd;--accent:#79d1cf;--tint:#203a44;--line:#324755;--shadow:0 8px 30px #0002;--good:#8edab5;--bad:#ffa3a9}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark;--bg:#101c29;--surface:#182838;--ink:#edf5f6;--muted:#afc4cd;--accent:#79d1cf;--tint:#203a44;--line:#324755;--shadow:0 8px 30px #0002;--good:#8edab5;--bad:#ffa3a9}}
*{box-sizing:border-box}html{background:var(--bg);font-size:var(--font);scroll-behavior:auto}body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Noto Sans JP",Meiryo,system-ui,sans-serif;line-height:1.7}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:var(--accent);text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}button:disabled{cursor:default;opacity:.55}h1,h2,h3,p{margin:0}h1{font-size:1.65rem;line-height:1.4;letter-spacing:.02em}h2{font-size:1.1rem;margin-bottom:12px}h3{font-size:1rem}small,.muted{color:var(--muted)}small{font-size:.875rem}img{max-width:100%;display:block}button,.button{min-height:44px;border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--ink);padding:10px 16px;display:inline-flex;align-items:center;justify-content:center;gap:8px;line-height:1.45}.primary{background:var(--accent);color:var(--surface);border-color:var(--accent);font-weight:650}.ghost{background:transparent}.button.full,button.full{width:100%}.icon-button{padding:8px;min-width:44px;font-size:1.35rem}.app-shell{width:100%;max-width:480px;margin:auto;min-height:100dvh}.app-header{padding:calc(16px + env(safe-area-inset-top)) 20px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:700;line-height:1.4}.brand small{display:block;font-weight:400;font-size:.75rem}.brand-mark{width:40px;height:40px;background:var(--accent);color:var(--surface);border-radius:13px;font-size:26px;text-align:center;line-height:40px}main{padding:4px 20px calc(100px + env(safe-area-inset-bottom));overflow-wrap:anywhere}main:focus{outline:none}.bottom-nav{position:fixed;z-index:10;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;display:grid;grid-template-columns:repeat(4,1fr);background:var(--surface);border-top:1px solid var(--line);padding:8px 8px calc(8px + env(safe-area-inset-bottom))}.bottom-nav a{min-height:52px;color:var(--muted);display:flex;flex-direction:column;align-items:center;font-size:.8rem;gap:2px;border-radius:13px}.bottom-nav a span{font-size:1.45rem;line-height:1.2}.bottom-nav a[aria-current=page]{background:var(--tint);color:var(--accent);font-weight:700}.eyebrow{color:var(--accent);font-size:.8rem;letter-spacing:.12em;font-weight:700;margin-bottom:10px}.page-title{margin-bottom:22px}.page-title p{margin-top:8px;color:var(--muted)}.panel{background:var(--surface);border:1px solid var(--line);border-radius:24px;padding:20px;margin-bottom:18px;box-shadow:var(--shadow)}.hero{background:var(--tint);border:0;padding:26px 22px}.hero h1{margin:6px 0 12px}.hero .button{margin-top:20px}.hero-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:16px}.hero-count{font-size:2.8rem;font-weight:700;line-height:1.2}.stack{display:grid;gap:12px}.row{display:flex;align-items:center;justify-content:space-between;gap:12px}.section-label{display:flex;justify-content:space-between;align-items:center;margin:24px 0 12px}.section-label h2{margin:0}.progress-row{margin-top:16px}.progress-label{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}.progress-label span{font-size:.85rem}progress{width:100%;height:8px;display:block;border:0;border-radius:10px;background:var(--line);accent-color:var(--accent)}progress::-webkit-progress-bar{background:var(--line);border-radius:10px}progress::-webkit-progress-value{background:var(--accent);border-radius:10px}.field{display:grid;gap:6px;margin-bottom:14px}.field label{font-size:.9rem;font-weight:600}input,select{width:100%;min-width:0;min-height:46px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink)}input[type=checkbox]{width:20px;min-height:20px;accent-color:var(--accent)}.range-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.checks{display:flex;flex-wrap:wrap;gap:4px 18px}.check-label{display:inline-flex;align-items:center;gap:8px;min-height:44px}.filters{padding:16px}.list-summary{font-size:.9rem;margin:16px 0;color:var(--muted)}.word-list{display:grid;gap:10px}.word-row{display:flex;align-items:center;gap:12px;padding:14px;border-radius:18px;border:1px solid var(--line);background:var(--surface);color:var(--ink);min-height:80px}.word-row .thumb{width:58px;height:58px;flex:none;border-radius:12px;object-fit:cover}.word-row .number{font-size:.75rem;color:var(--muted);font-variant-numeric:tabular-nums}.word-row .word-name{font-size:1.2rem;font-weight:700;letter-spacing:.02em}.word-row .text{min-width:0;flex:1}.word-row .meaning-preview{font-size:1rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--muted)}.rating-dot{font-size:.7rem;white-space:nowrap;color:var(--accent)}.back-row{margin-bottom:14px}.word-visual{aspect-ratio:3/2;width:100%;height:auto;border-radius:24px;object-fit:cover;background:var(--tint)}.placeholder{aspect-ratio:3/2;border-radius:24px;background:var(--tint);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:32px;gap:16px;color:var(--accent)}.placeholder .visual-mark{font-size:3rem;opacity:.6}.placeholder strong{font-size:1.45rem;line-height:1.7}.word-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:24px 0 4px}.english-word{font-size:2rem;letter-spacing:.035em;font-weight:750;line-height:1.35;overflow-wrap:anywhere}.meta-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap;color:var(--muted);margin-bottom:22px}.badge{font-size:.8rem;padding:3px 9px;background:var(--tint);color:var(--accent);border-radius:8px}.core{border-left:3px solid var(--accent);padding:12px 16px;background:var(--tint);border-radius:0 14px 14px 0;margin-bottom:24px}.core p{font-weight:650;font-size:1.1rem}.word-section{margin:24px 0}.meaning-list{padding-left:25px;margin:0}.meaning-list li{padding-left:4px;margin-bottom:6px}.example{padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:18px;margin-bottom:12px}.example-en{font-size:1.05rem;line-height:1.7}.example mark{color:var(--accent);background:var(--tint);border-radius:3px;padding:0 2px;font-weight:700}.example-controls{display:flex;justify-content:space-between;gap:8px;margin-top:10px}.translation{padding-top:12px;color:var(--muted);border-top:1px solid var(--line);margin-top:12px}.compare-card{padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--surface);margin-bottom:12px}.compare-card a{font-size:1.15rem;font-weight:700;display:inline-flex;align-items:center;min-height:44px}.compare-card p{margin-top:4px}details{border:1px solid var(--line);border-radius:16px;padding:0 16px;background:var(--surface)}summary{cursor:pointer;min-height:48px;display:list-item;padding:12px 0;font-weight:600}dl{margin:0 0 16px}dt{font-weight:650}dd{margin:0 0 12px;color:var(--muted)}.rating-controls{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:24px}.rating-controls button{padding:12px 6px;font-size:.9rem}.rating-controls button[aria-pressed=true]{border:2px solid var(--accent);background:var(--tint);color:var(--accent)}.word-arrows{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}.study-front{padding:0;width:100%;display:block;position:relative;border:0;overflow:hidden;border-radius:24px;background:var(--tint);text-align:left}.study-front .placeholder{border-radius:24px}.flip-hint{text-align:center;font-size:.9rem;color:var(--muted);margin:12px 0}.study-back{min-height:320px;padding:24px;text-align:center;display:flex;flex-direction:column;justify-content:center;gap:20px}.study-back .meaning-list{text-align:left}.session-progress{margin-bottom:20px}.quiz-prompt{font-size:1.35rem;line-height:1.7;margin:20px 0}.quiz-options{display:grid;gap:12px}.quiz-option{text-align:left;justify-content:flex-start;padding:16px;min-height:64px}.quiz-option.correct{border:2px solid var(--good);color:var(--good);opacity:1;background:var(--tint)}.quiz-option.wrong{border:2px solid var(--bad);color:var(--bad);opacity:1}.feedback{margin:18px 0;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.feedback strong{display:block;margin-bottom:6px}.score{font-size:3.6rem;line-height:1.2;font-weight:750;color:var(--accent);margin:16px 0}.notice{margin:0 20px 16px;background:var(--tint);border:1px solid var(--line);padding:12px 14px;border-radius:14px;font-size:.9rem}.notice button{margin-top:8px}.empty{text-align:center;padding:32px 12px;color:var(--muted)}.loading{padding:48px 0;text-align:center}.danger{color:var(--bad);border-color:var(--bad)}.setting-note{font-size:.9rem;color:var(--muted);margin-bottom:20px}.study-counter{font-variant-numeric:tabular-nums}.fade-in{animation:appear .18s ease-out}@keyframes appear{from{opacity:.4;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}[hidden]{display:none!important}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media(min-width:540px){.app-shell{border-left:1px solid var(--line);border-right:1px solid var(--line)}}

.quiz-context{margin-top:20px;padding:16px;border-left:3px solid var(--accent);background:var(--tint);border-radius:0 14px 14px 0}
/* Editorial card polish: shared tokens keep every screen consistent. */
:root{--serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;--nav-height:69px;--rating-height:80px;--known-ink:#286348;--known-bg:#edf5ef;--shaky-ink:#79591c;--shaky-bg:#fbf5e7;--still-ink:#53646a;--still-bg:#f0f3f3;--bg:#f6f8f6;--shadow:0 8px 30px #173e360d}
:root[data-theme=dark]{--known-ink:#a6d9bb;--known-bg:#243e34;--shaky-ink:#e3cb93;--shaky-bg:#3d3628;--still-ink:#becbd2;--still-bg:#283947}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--known-ink:#a6d9bb;--known-bg:#243e34;--shaky-ink:#e3cb93;--shaky-bg:#3d3628;--still-ink:#becbd2;--still-bg:#283947;--bg:#101c29}}
.icon{width:22px;height:22px;display:block;flex:none}.brand-mark{display:flex;align-items:center;justify-content:center}.brand-mark .icon{width:24px;height:24px}.icon-button{border-radius:50%;flex:none}.word-heading .icon-button{width:48px;height:48px;background:var(--accent);border-color:var(--accent);color:var(--surface);box-shadow:var(--shadow)}.bottom-nav a span{display:flex;align-items:center;justify-content:center;height:27px}.bottom-nav .icon{width:22px;height:22px}
button,.button,.word-row,.featured-word{transition:background-color .15s,color .15s,box-shadow .15s}button:active:not(:disabled),.button:active,.word-row:active,.featured-word:active{filter:brightness(.94)}
@media(hover:hover){button:hover:not(:disabled),.button:hover,.word-row:hover{box-shadow:0 0 0 2px var(--line)}}
.english-word{font-family:var(--serif);font-size:clamp(2.6rem,11vw,3.4rem);font-weight:500;letter-spacing:-.025em;line-height:1.15}.word-row .word-name{font-family:var(--serif);font-weight:600;font-size:1.35rem;letter-spacing:0}.meta-row>span[lang=en]{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.85rem;letter-spacing:.02em}.word-heading{margin:24px 0 10px}.word-heading>div{min-width:0}.word-heading small{font-size:.75rem;letter-spacing:.06em}.meta-row{margin-bottom:28px}.word-visual{height:auto;aspect-ratio:3/2;object-fit:cover;border:1px solid var(--line)}
.core{position:relative;margin:-24px 12px 20px;padding:18px 20px;border:1px solid var(--line);border-radius:18px;background:var(--surface);box-shadow:0 10px 28px #102b3014}.core small{display:block;font-size:.65rem;letter-spacing:.12em;color:var(--accent);font-weight:700;margin-bottom:8px}.core small span{margin-left:10px;letter-spacing:.03em;color:var(--muted)}.core p{font-size:1.05rem;line-height:1.8;font-weight:600}.word-section{margin:30px 0}.word-section-title{font-size:1rem;display:flex;align-items:center;gap:12px;line-height:1.5;margin-bottom:14px}.word-section-title>span,.detail-label{font-size:.65rem;font-weight:700;letter-spacing:.12em;color:var(--accent)}.detail-label{display:inline-block;margin-right:12px}.section-note{font-size:.8rem;color:var(--muted);margin:-6px 0 14px}.meaning-list{list-style:none;padding:0;counter-reset:meaning}.meaning-list li{display:flex;align-items:baseline;gap:12px;padding:0;margin:12px 0;counter-increment:meaning}.meaning-chip{flex:none;display:inline-flex;align-items:center;justify-content:center;width:25px;height:25px;border-radius:50%;font-size:.75rem;background:var(--tint);color:var(--accent);font-variant-numeric:tabular-nums;font-weight:600}.swipe-hint{text-align:center;font-size:.7rem;letter-spacing:.02em;color:var(--muted);margin:12px 0 0}.thumb-letter{display:flex;justify-content:center;align-items:center;background:var(--tint);color:var(--accent);font-family:var(--serif);font-size:1.8rem}
main.has-rating-bar{padding-bottom:calc(var(--nav-height) + var(--rating-height) + 32px + env(safe-area-inset-bottom))}.rating-controls{position:fixed;z-index:9;left:50%;transform:translateX(-50%);bottom:calc(var(--nav-height) + env(safe-area-inset-bottom));width:100%;max-width:480px;margin:0;padding:12px 20px;background:var(--surface);border-top:1px solid var(--line);box-shadow:0 -8px 24px #102b3008;gap:8px}.rating-controls button{min-height:48px;border:2px solid transparent;border-radius:12px;font-weight:600;padding:10px 4px}.rating-controls [data-rating=known]{color:var(--known-ink);background:var(--known-bg)}.rating-controls [data-rating=shaky]{color:var(--shaky-ink);background:var(--shaky-bg)}.rating-controls [data-rating=still]{color:var(--still-ink);background:var(--still-bg)}.rating-controls button[aria-pressed=true]{border-color:currentColor;box-shadow:inset 0 0 0 1px currentColor}.rating-controls button[aria-pressed=true]::before{content:'✓';font-size:.8rem}html{scroll-padding-bottom:calc(var(--nav-height) + var(--rating-height) + 16px + env(safe-area-inset-bottom))}
.featured-word{display:block;border:1px solid var(--line);border-radius:24px;background:var(--surface);color:var(--ink);overflow:hidden;box-shadow:var(--shadow);margin-bottom:20px}.featured-label{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;gap:8px}.featured-label .eyebrow{font-size:.65rem;letter-spacing:.1em;margin:0}.featured-label>span:last-child{display:flex;gap:4px;align-items:center;color:var(--muted);font-size:.75rem}.featured-label .icon{width:15px;height:15px}.featured-word .word-visual{border-radius:0;border:0;aspect-ratio:3/2;object-fit:contain;background:#fff}.featured-caption{padding:16px 20px 20px}.featured-caption>div{display:flex;gap:12px;align-items:baseline;flex-wrap:wrap}.featured-caption small{font-size:.7rem;order:2}.featured-caption h2{font-family:var(--serif);font-size:2.2rem;line-height:1.2;font-weight:500;letter-spacing:-.02em;margin:0}.featured-caption p{font-size:.9rem;color:var(--muted);margin-top:8px}.hero{padding:22px}.hero h2{font-size:1.25rem}.hero-count{font-family:var(--serif);font-weight:500}.hero .full{margin-top:18px}.page-title .eyebrow{font-size:.7rem}.page-title h1{font-size:1.55rem}.page-title p{font-size:.9rem}.offline-error{margin-bottom:0;font-size:.8rem}
.fade-in{animation:polish-appear .18s ease-out}@keyframes polish-appear{from{opacity:.6}to{opacity:1}}
@media(max-height:500px){.rating-controls{padding-top:6px;padding-bottom:6px}.rating-controls button{min-height:44px}.bottom-nav{padding-top:4px;padding-bottom:calc(4px + env(safe-area-inset-bottom))}.bottom-nav a{min-height:48px}:root{--nav-height:57px;--rating-height:58px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
h1[tabindex="-1"]:focus{outline:none}.word-page .word-heading{margin:0 0 8px}.word-page .meta-row{margin-bottom:18px}.featured-word .word-visual{object-fit:cover;background:var(--tint)}.placeholder .visual-mark .icon{width:48px;height:48px}
/* Allow list rows to shrink below the intrinsic width of long translations. */
.word-list{grid-template-columns:minmax(0,1fr)}.word-row{min-width:0}

/* Landscape illustrations and plain Japanese card headings. */
.core{margin:20px 0;padding:16px;box-shadow:none}.core h2{font-size:1rem;margin-bottom:8px}.illustration-note{font-size:.8rem;color:var(--muted);margin-top:12px}.compare-card>small{margin-left:8px}.study-back{aspect-ratio:3/2;min-height:0}.placeholder{color:var(--muted)}

/* Brief, quiet return cue, including when motion is reduced. */
.word-row.return-highlight{background:var(--tint);border-color:var(--accent);outline:none}
.derivative-note{display:flex;align-items:flex-start;gap:8px;margin-top:8px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--tint);color:var(--ink);font-size:.85rem;line-height:1.7}
.derivative-note .icon{width:16px;height:16px;margin-top:4px;color:var(--accent)}

/* Authentication and admin use the same quiet, mobile-first panels. */
.auth-panel form{display:grid;gap:14px}.auth-panel .field{margin:0}.auth-panel p{overflow-wrap:anywhere}.auth-message{min-height:1.7em;color:var(--bad);font-size:.9rem}.auth-panel button{width:100%}.auth-panel input{min-width:0;width:100%}.bottom-nav{grid-template-columns:repeat(auto-fit,minmax(0,1fr))}.admin-email,.staff-link-row{overflow-wrap:anywhere}.admin-actions{display:flex;flex-wrap:wrap;gap:8px}.admin-actions button{flex:1 1 120px}.staff-link-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:16px}.staff-link-row span{min-width:0}.staff-link-row button{flex:none}textarea{font:inherit;width:100%;padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);resize:vertical}textarea:focus-visible{outline:3px solid var(--accent);outline-offset:3px}#admin-message{white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:16px}#staff-result{margin-top:16px}#new-staff-url{width:100%;min-width:0}