:root{--text:#55505c;--text-h:#08060d;--bg:#fbfaf9;--surface:#fff;--border:#e5e4e7;--accent:#aa3bff;--accent-bg:#aa3bff14;--shadow:#00000014 0 10px 15px -3px, #0000000a 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--serif-jp:"Yu Mincho", "Hiragino Mincho ProN", serif;font:17px/155% var(--sans);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--text:#b7b3bd;--text-h:#f3f2f6;--bg:#121218;--surface:#191a22;--border:#2e2f3a;--accent:#c084fc;--accent-bg:#c084fc1f;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}}:root[data-theme=dark]{--text:#b7b3bd;--text-h:#f3f2f6;--bg:#121218;--surface:#191a22;--border:#2e2f3a;--accent:#c084fc;--accent-bg:#c084fc1f;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}:root[data-theme=light]{--text:#55505c;--text-h:#08060d;--bg:#fbfaf9;--surface:#fff;--border:#e5e4e7;--accent:#aa3bff;--accent-bg:#aa3bff14;--shadow:#00000014 0 10px 15px -3px, #0000000a 0 4px 6px -2px}*{box-sizing:border-box}html{overflow-x:hidden}body{margin:0;overflow-x:hidden}h1,h2,h3{color:var(--text-h);margin:0 0 8px;font-weight:600}p{margin:0 0 8px}a{color:inherit;text-decoration:none}.app-shell{align-items:stretch;min-height:100svh;display:flex}.brand{color:var(--text-h);align-items:baseline;gap:6px;font-size:19px;font-weight:700;display:inline-flex}.brand span{color:var(--accent);font-size:14px;font-weight:600}.sidebar{background:var(--surface);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;align-self:flex-start;gap:22px;width:250px;height:100svh;padding:20px 14px;display:flex;position:sticky;top:0;overflow-y:auto}.sidebar>.brand{padding:0 8px}.sidebar-top-nav{border-bottom:1px solid var(--border);flex-direction:column;gap:2px;margin-bottom:4px;padding-bottom:16px;display:flex}.sidebar-nav{flex-direction:column;gap:16px;display:flex}.sidebar-group-title{letter-spacing:.6px;color:var(--text);opacity:.65;align-items:center;gap:8px;margin-bottom:2px;padding:0 8px;font-size:12px;font-weight:700;display:flex}.level-dot{background:var(--accent);border-radius:50%;width:8px;height:8px}.sidebar-link{color:var(--text);border-radius:8px;padding:8px 10px;font-size:14px;display:block}.sidebar-link:hover{background:var(--accent-bg);color:var(--text-h)}.sidebar-link.active{background:var(--accent-bg);color:var(--accent);font-weight:600}.sidebar-link.disabled{opacity:.4}.theme-toggle{font:inherit;border:1px solid var(--border);background:var(--bg);color:var(--text-h);cursor:pointer;border-radius:8px;margin-top:auto;padding:10px 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a:hover{color:var(--accent)}.breadcrumb-link{font:inherit;font-size:inherit;color:inherit;cursor:pointer;background:0 0;border:none;padding:0}.breadcrumb-link:hover{color:var(--accent)}.level-header{flex-wrap:wrap;align-items:center;gap:16px;margin-bottom:24px;display:flex}.level-header>div{min-width:0}.search-input{width:100%;font:inherit;border:1px solid var(--border);background:var(--surface);color:var(--text-h);border-radius:10px;margin-bottom:20px;padding:12px 14px}.search-input:focus{outline:2px solid var(--accent);outline-offset:-1px}.topic-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.category-toggle{margin-bottom:24px}.category-group{margin-bottom:28px}.category-group-title{color:var(--accent);border-bottom:1px solid var(--border);margin-bottom:12px;padding-bottom:6px;font-size:15px;font-weight:700}.topic-list-row{align-items:stretch;gap:8px;display:flex}.topic-list-row 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p{color:var(--text);margin:0;font-size:14px}.chevron{color:var(--accent);font-size:20px}.empty-state{text-align:center;color:var(--text);opacity:.7;padding:40px 0}.topic-detail{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:28px 32px}.topic-detail h1{font-size:26px}.topic-detail .reading{color:var(--accent);font-size:15px;font-family:var(--serif-jp);margin-bottom:10px}.topic-detail .meaning{color:var(--text-h);margin-bottom:24px;font-size:16px;font-weight:600}.topic-detail section{margin-bottom:22px}.topic-detail section:last-child{margin-bottom:0}.topic-detail h2{text-transform:uppercase;letter-spacing:.6px;color:var(--accent);margin-bottom:8px;font-size:13px}.structure{background:var(--accent-bg);border-radius:8px;padding:10px 14px;font-family:ui-monospace,Consolas,monospace;font-size:14px;display:inline-block}.examples{flex-direction:column;gap:14px;margin:0;padding:0;list-style:none;display:flex}.example{border-left:3px solid var(--accent);padding-left:14px}.example .jp{color:var(--text-h);margin-bottom:2px;font-size:17px}.example .furigana{color:var(--text);opacity:.75;margin-bottom:4px;font-size:13px}.example .furigana-reveal{font:inherit;color:var(--accent);cursor:pointer;text-align:left;background:0 0;border:none;padding:0;font-size:13px;font-weight:600;display:block}.example .cz{color:var(--text);margin:0;font-size:14px}.notes{font-size:14px;font-style:italic}.common-mistake{color:var(--text-h);background:#e05c5c1a;border:1px solid #e05c5c59;border-radius:10px;padding:12px 16px;font-size:14px}.related-list{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.related-link{background:var(--accent-bg);color:var(--accent);border-radius:999px;padding:6px 12px;font-size:13px;font-weight:600;display:inline-block}.related-link:hover{background:var(--accent);color:var(--surface)}.topic-nav{justify-content:space-between;gap:12px;margin-top:20px;display:flex}.nav-link{border:1px solid 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solid var(--border);background:var(--bg);color:var(--text-h);cursor:pointer;border-radius:10px;padding:16px 18px;font-size:19px;line-height:1.35;transition:border-color .15s,background .15s}.quiz-choice:hover:not(:disabled){border-color:var(--accent);background:var(--accent-bg)}.quiz-choice:disabled{cursor:default}.quiz-choice.correct{color:#2f8f5f;background:#4caf7d26;border-color:#4caf7d;font-weight:600}.quiz-choice.incorrect{color:#c23e3e;background:#e05c5c1f;border-color:#e05c5c;font-weight:600}.quiz-explanation{background:var(--accent-bg);border:1px solid var(--border);border-radius:10px;margin-top:16px;padding:14px 16px}.quiz-explanation p{color:var(--text);margin:0 0 8px;font-size:14px;line-height:1.5}.quiz-explanation-link{color:var(--accent);font-size:13px;font-weight:600}.btn-primary{font:inherit;background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:12px 24px;font-size:15px;font-weight:600;display:inline-block}.btn-primary:hover{opacity:.9}.btn-secondary{border:1px solid var(--border);color:var(--text-h);border-radius:10px;padding:12px 24px;font-size:15px;font-weight:600;display:inline-block}.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}.quiz-next{width:100%}.quiz-summary{background:var(--surface);border:1px solid var(--border);text-align:center;border-radius:14px;padding:40px 32px}.score-big{color:var(--accent);margin:12px 0;font-size:48px;font-weight:700}.quiz-summary-actions{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:20px;display:flex}.direction-toggle{border:1px solid var(--border);background:var(--surface);border-radius:10px;flex-wrap:wrap;gap:4px;max-width:100%;margin-bottom:20px;padding:4px;display:inline-flex}.direction-toggle button{font:inherit;color:var(--text);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-radius:7px;padding:8px 14px;font-size:13px;font-weight:600}.direction-toggle button.active{background:var(--accent);color:#fff}.sidebar-lang{margin-top:8px;display:flex}.sidebar-lang button{flex:1;padding:6px 0}.speak-btn{font:inherit;vertical-align:middle;border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:999px;margin-left:8px;padding:4px 8px;font-size:.55em;line-height:1}.speak-btn:hover{border-color:var(--accent);background:var(--accent-bg)}.example .jp .speak-btn{font-size:13px}.stats-bar{color:var(--text);background:var(--accent-bg);border-radius:10px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:16px;padding:10px 16px;font-size:13px;display:flex}.stats-bar strong{color:var(--accent)}.stats-reset{font:inherit;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:600}.stats-reset:hover{border-color:var(--accent);color:var(--accent)}.mock-cta{border:1px dashed var(--border);color:var(--text-h);background:0 0}.mock-cta:hover{border-color:var(--accent);background:var(--accent-bg);color:var(--accent);border-style:solid}.mock-start{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:28px 32px}.mock-info-list{flex-direction:column;gap:10px;margin:0 0 24px;padding:0;font-size:15px;list-style:none;display:flex}.mock-history{border-top:1px solid var(--border);margin-bottom:24px;padding-top:16px}.mock-history h2{text-transform:uppercase;letter-spacing:.6px;color:var(--accent);margin-bottom:10px;font-size:13px}.mock-history ul{flex-direction:column;gap:6px;margin:0;padding:0;list-style:none;display:flex}.mock-history li{color:var(--text);align-items:center;gap:14px;font-size:14px;display:flex}.mock-history li span:first-child{opacity:.75;min-width:90px}.mock-header-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:20px;display:flex}.mock-timer{color:var(--text);opacity:.8;font-size:13px;font-weight:700}.mock-timer.low{color:#e05c5c;opacity:1}.quiz-choice.selected{border-color:var(--accent);background:var(--accent-bg);color:var(--accent);font-weight:600}.mock-nav-row{justify-content:space-between;gap:12px;display:flex}.mock-submit-early{font:inherit;color:var(--text);opacity:.6;cursor:pointer;background:0 0;border:none;margin:14px auto 0;font-size:12px;text-decoration:underline;display:block}.mock-submit-early:hover{opacity:1;color:var(--accent)}.mock-verdict{font-size:18px;font-weight:700}.mock-verdict.pass{color:#4caf7d}.mock-verdict.fail{color:#e05c5c}.mock-review{margin-top:24px}.mock-review h2{margin-bottom:12px;font-size:16px}.mock-review ul{flex-direction:column;gap:12px;margin:0;padding:0;list-style:none;display:flex}.mock-review-item{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:16px 18px}.mock-review-main{align-items:flex-start;gap:10px;margin-bottom:8px;display:flex}.mock-review-kind{font-size:18px}.mock-review-jp{color:var(--text-h);margin:0;font-size:17px;font-weight:600}.mock-review-sub{color:var(--accent);margin:2px 0 0;font-size:13px}.mock-review-answer{color:var(--text);margin:0 0 6px;font-size:14px}.mock-review-link{color:var(--accent);font-size:13px;font-weight:600}.mock-review-link:hover{text-decoration:underline}.comparison-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;display:grid}.comparison-card{background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:18px 20px}.comparison-card h3{color:var(--accent);margin-bottom:8px;font-size:20px}.comparison-usage{color:var(--text);margin-bottom:14px;font-size:14px}.comparison-card .jp{color:var(--text-h);margin-bottom:2px;font-size:16px}.comparison-card .furigana{color:var(--text);opacity:.75;margin-bottom:4px;font-size:13px}.comparison-card .cz{color:var(--text);margin:0;font-size:14px}.progress-summary{background:var(--surface);border:1px solid var(--border);border-radius:14px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-bottom:28px;padding:18px 24px;display:flex}.progress-summary-main{align-items:baseline;gap:12px;display:flex}.progress-summary-pct{color:var(--accent);font-size:32px;font-weight:700}.progress-summary-label{color:var(--text);font-size:14px}.progress-summary-levels{flex-wrap:wrap;gap:8px;display:flex}.progress-level-chip{background:var(--accent-bg);color:var(--accent);border-radius:999px;padding:5px 10px;font-size:12px;font-weight:600}.level-progress-badge{color:var(--accent);margin-top:8px;font-size:12px;font-weight:700;display:block}.vocab-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.vocab-item{background:var(--surface);border:1px solid var(--border);border-radius:10px;align-items:center;gap:14px;padding:12px 18px;transition:border-color .15s,background .15s;display:flex}.vocab-item:hover{border-color:var(--accent);background:var(--accent-bg)}.vocab-emoji{text-align:center;flex-shrink:0;width:32px;font-size:26px}.vocab-main{flex:1;min-width:0}.vocab-jp-row{align-items:center;gap:6px;display:flex}.vocab-jp{color:var(--text-h);font-size:18px;font-weight:600}.vocab-reading{color:var(--accent);font-size:13px;font-family:var(--serif-jp);display:block}.vocab-romaji{font-family:var(--sans);color:var(--text);opacity:.65;font-style:italic}.vocab-level-tag{font-family:var(--sans);letter-spacing:.3px;color:var(--tag-color);background:color-mix(in 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.subtitle{margin-bottom:18px}.settings-rate-row{align-items:center;gap:10px;margin-bottom:20px;display:flex}.settings-rate-label{color:var(--text);opacity:.7;flex-shrink:0;font-size:13px}.settings-rate-slider{accent-color:var(--accent);flex:1}.settings-rate-value{color:var(--accent);text-align:right;flex-shrink:0;min-width:40px;font-size:15px;font-weight:600}.kana-grid{grid-template-columns:repeat(auto-fill,minmax(64px,1fr));gap:8px;margin-top:20px;display:grid}.kana-section{margin-top:24px}.kana-section-title{color:var(--accent);margin:0 0 10px;font-size:15px;font-weight:700}.kana-row{grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;max-width:440px;margin-bottom:8px;display:grid}.kana-tile{font:inherit;aspect-ratio:1;border:1px solid var(--border);background:var(--surface);color:var(--text-h);cursor:pointer;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;padding:6px;transition:border-color .15s,transform 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0;font-size:15px;line-height:1.5}.kanji-facts-counts{opacity:.75;margin:10px 0 0;font-size:13px}.kanji-facts-source{opacity:.6;margin:4px 0 0;font-size:11px}.kanji-detail-label{color:var(--text);opacity:.8;margin:0 0 6px;font-size:12px;font-weight:600}.kanji-sample-row{flex-wrap:wrap;gap:8px;display:flex}.kanji-sample-word{font:inherit;background:var(--accent-bg);color:var(--accent);cursor:pointer;border:none;border-radius:8px;padding:6px 10px;font-size:15px}.kanji-sample-word:hover{opacity:.85}.kanji-grid{grid-template-columns:repeat(auto-fill,minmax(52px,1fr))}.kanji-tile{border-top:3px solid var(--tile-accent,var(--border))}.kanji-tile .kana-char{font-size:22px}.kanji-tile.active{border-color:var(--accent);background:var(--accent-bg)}.due-review-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;display:grid}.due-review-card{font:inherit;text-align:left;background:var(--surface);border:1px solid 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