:root{--paper:#f4f6f2;--card:#fff;--ink:#1e2b26;--ledger:#1f7a54;--shu:#c2402a;--slate:#68736d;--rule:#d9e0da;--jp:'Zen Kaku Gothic New',sans-serif;--en:'Newsreader',serif;--num:'IBM Plex Mono',monospace}
*{box-sizing:border-box;margin:0;padding:0}
body{min-width:280px;background:var(--paper);color:var(--ink);font-family:var(--jp);padding:24px}
button,select{font:inherit}
button{cursor:pointer}
button:focus-visible,select:focus-visible{outline:2px solid var(--ledger);outline-offset:2px}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.app-shell{width:min(100%,1040px);min-height:calc(100vh - 48px);margin:auto;background:var(--card);border:1px solid #c9d2cb;box-shadow:0 18px 48px rgba(30,43,38,.1);display:flex;flex-direction:column}
.appbar{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 24px;border-bottom:1px solid var(--rule)}
.brand{color:var(--ink);text-decoration:none;font-size:17px;font-weight:700;letter-spacing:.06em}
.brand small{display:block;color:var(--slate);font-family:var(--en);font-size:12px;font-weight:400;letter-spacing:.16em;margin-top:1px}
.header-actions{display:flex;align-items:center;gap:8px}
.save-state{color:var(--slate);font-size:12px;margin-right:4px;white-space:nowrap}
.icon-btn,.speak-button{width:44px;height:44px;display:inline-grid;place-items:center;flex:none;border:1px solid var(--rule);background:#fff;color:var(--ink);border-radius:6px}
.icon-btn:hover,.speak-button:hover{border-color:var(--ledger);color:var(--ledger);background:#f0f7f3}
.icon-btn svg,.speak-button svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.mode-tabs{align-self:center;width:min(360px,calc(100% - 32px));margin:18px auto 0;padding:3px;display:flex;background:#edf1ec;border-radius:8px}
.mode-tab{min-height:40px;flex:1;border:0;border-radius:6px;background:transparent;color:var(--slate);font-weight:700}
.mode-tab.active{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(30,43,38,.12)}
main{flex:1;display:flex;min-height:0}
main>section{width:100%}
#study-view{display:flex;flex-direction:column;padding:24px clamp(18px,6vw,72px) 32px}
.study-subject-control{width:min(100%,720px);margin:0 auto 14px;display:grid;grid-template-columns:auto minmax(220px,360px);align-items:center;justify-content:space-between;gap:12px;color:var(--slate);font-size:12px;font-weight:700}.study-subject-control select{width:100%;min-height:44px;border:1px solid var(--rule);border-radius:6px;background:#fff;color:var(--ink);padding:0 36px 0 12px}
.progress-panel{width:min(100%,720px);margin:0 auto 20px}
.progress-bar{height:9px;display:flex;overflow:hidden;border-radius:5px;background:#e7ece7}
.progress-segment{height:100%}
.progress-legend{display:flex;flex-wrap:wrap;gap:10px 20px;margin-top:9px;color:#4c5852;font-size:12px}
.legend-item{display:flex;align-items:center;gap:6px}.legend-dot{width:8px;height:8px;border-radius:50%}.legend-item b{font-family:var(--num);font-weight:500}
.flashcard{width:min(100%,720px);min-height:380px;margin:auto;border:1px solid var(--rule);border-radius:8px;background:repeating-linear-gradient(to bottom,transparent 0 35px,#f0f4ef 35px 36px);padding:58px clamp(20px,6vw,64px) 32px;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.card-meta{position:absolute;inset:16px 16px auto;display:flex;align-items:center;justify-content:space-between;gap:12px}.status-chip{padding:5px 11px;border-radius:999px;font-size:12px;font-weight:700}.status-untried{background:#edf1ec;color:#5b665f}.status-got{background:#e2f0e8;color:var(--ledger)}.status-again{background:#f8e7e2;color:var(--shu)}.card-number{font:12px var(--num);color:var(--slate)}
.word-line{display:flex;align-items:center;justify-content:center;gap:12px;max-width:100%}.headword{font:500 clamp(34px,6vw,52px)/1.1 var(--en);overflow-wrap:anywhere}.speak-button{color:var(--ledger);border-radius:50%}.speak-button.unavailable{color:var(--shu);border-color:#e7b8ae;background:#fdf4f1}.ipa{margin-top:7px;color:#59655f;font:17px/1.4 var(--en)}
.answer{width:100%;margin-top:26px;padding-top:22px;border-top:1px solid var(--rule)}.meaning{font-size:clamp(24px,4vw,34px);font-weight:700}.description{max-width:560px;margin:10px auto 0;color:#45524b;font-size:14px;line-height:1.8}.etymology{max-width:560px;margin:18px auto 0;padding:14px 16px;text-align:left;background:#f5f8f5;border-left:3px solid var(--ledger)}.detail-label{display:block;color:var(--ledger);font-size:12px;font-weight:700;margin-bottom:4px}.etymology p{font-size:13px;line-height:1.7}.study-hint{color:var(--slate);font-size:12px;margin-top:20px}
.study-actions{width:min(100%,720px);margin:16px auto 0;display:flex;gap:10px}.primary-button,.grade-button{min-height:58px;flex:1;border:0;border-radius:6px;color:#fff;font-size:15px;font-weight:700;letter-spacing:.06em}.primary-button{background:var(--ink)}.grade-again{background:var(--shu)}.grade-got{background:var(--ledger)}.primary-button span,.grade-button span{display:block;font-size:11px;font-weight:500;letter-spacing:.12em;opacity:.78;margin-top:1px}
#list-view{padding:30px clamp(18px,5vw,56px) 40px}.list-heading-row{display:flex;align-items:end;justify-content:space-between;gap:20px}.eyebrow{color:var(--ledger);font-size:12px;font-weight:700;letter-spacing:.15em;margin-bottom:4px}.list-heading-row h1{font-size:26px}.sort-control{display:grid;gap:4px;color:var(--slate);font-size:12px}.sort-control select{min-height:40px;border:1px solid var(--rule);border-radius:6px;background:#fff;color:var(--ink);padding:0 34px 0 10px}
.filter-tabs{display:flex;flex-wrap:wrap;gap:7px;margin-top:22px}.filter-tab{min-height:40px;padding:6px 13px;border:1px solid var(--rule);border-radius:999px;background:#fff;color:#536059;font-size:12px;font-weight:700}.filter-tab[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:#fff}.filter-tab b{font:500 11px var(--num);margin-left:3px}.result-count{margin:14px 0 8px;color:var(--slate);font-size:12px}.word-list{border-top:1px solid var(--rule)}
.list-tools{display:grid;grid-template-columns:minmax(0,2fr) minmax(220px,1fr);gap:12px;margin-top:22px}.search-control,.subject-control{display:grid;gap:4px;color:var(--slate);font-size:12px}.search-control input,.subject-control select{width:100%;min-height:44px;border:1px solid var(--rule);border-radius:6px;background:#fff;color:var(--ink);padding:0 12px}.load-more{display:block;min-height:46px;margin:20px auto 0;padding:0 24px;border:1px solid var(--ink);border-radius:6px;background:#fff;color:var(--ink);font-weight:700}.load-more:hover{background:#edf1ec}
.word-row{display:grid;grid-template-columns:12px minmax(0,1fr) auto auto;align-items:center;gap:12px;padding:14px 4px;border-bottom:1px solid #edf1ec}.row-dot{width:9px;height:9px;border-radius:50%}.row-copy{min-width:0}.row-word{font:500 20px/1.2 var(--en);overflow-wrap:anywhere}.row-ipa{color:#59655f;font:14px/1.4 var(--en);margin-top:2px}.row-ja{color:#45524b;font-size:13px;margin-top:3px}.row-section{color:var(--slate);font-size:11px;margin-top:3px}.row-status{width:84px;text-align:right;font-size:12px;font-weight:700}.row-status.status-got-text{color:var(--ledger)}.row-status.status-again-text{color:var(--shu)}.row-status.status-untried-text{color:var(--slate)}
.word-row-quiz{align-items:start}.row-quiz-actions{grid-column:2/-1;display:flex;gap:8px;min-height:40px}.row-reveal-button,.row-grade-button{min-height:40px;padding:0 16px;border-radius:6px;font-size:12px;font-weight:700}.row-reveal-button{border:1px solid var(--ink);background:#fff;color:var(--ink)}.row-reveal-button:hover{background:#edf1ec}.row-grade-button{min-width:112px;border:0;color:#fff}.row-grade-again{background:var(--shu)}.row-grade-got{background:var(--ledger)}
.toast{position:fixed;z-index:10;left:50%;bottom:22px;max-width:min(520px,calc(100% - 24px));transform:translate(-50%,12px);padding:10px 15px;border-radius:6px;background:var(--ink);color:#fff;font-size:13px;line-height:1.5;box-shadow:0 8px 24px rgba(30,43,38,.22);opacity:0;pointer-events:none;transition:.18s}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:640px){body{padding:0}.app-shell{min-height:100dvh;border:0;box-shadow:none}.appbar{padding:12px 14px;gap:10px}.brand{font-size:15px}.brand small{font-size:10px}.save-state{display:none}.mode-tabs{margin-top:12px}#study-view{padding-top:18px}.study-subject-control{grid-template-columns:1fr;gap:5px}.flashcard{min-height:400px;padding-inline:20px}.word-line{gap:8px}.headword{font-size:clamp(30px,10vw,42px)}.list-heading-row{align-items:start;flex-direction:column}.sort-control{width:100%}.sort-control select{width:100%}.list-tools{grid-template-columns:1fr}.word-row{grid-template-columns:10px minmax(0,1fr) 44px;gap:8px}.word-row .speak-button{grid-column:3;grid-row:1}.row-status{grid-column:2/4;width:auto;text-align:left}.row-quiz-actions{grid-column:2/4}.row-grade-button{min-width:0;flex:1}.row-section{display:none}}
@media(max-width:360px){.header-actions{gap:4px}.appbar{padding-inline:10px}.icon-btn{width:40px;height:40px}.brand small{display:none}.study-actions{gap:7px}.primary-button,.grade-button{font-size:13px}}
@media(prefers-reduced-motion:reduce){.toast{transition:none}}