:root{--bg: #f4f5f8;--surface: #ffffff;--surface-2: #eceef3;--ink: #171b26;--ink-2: #4a5163;--ink-3: #6b7285;--line: #d9dce5;--accent: #b9481a;--accent-ink: #ffffff;--accent-soft: #f9e6dc;--coll: #245f86;--coll-soft: #e1eef6;--idiom: #74387f;--idiom-soft: #f2e5f4;--good: #1d7347;--good-soft: #e1f2e8;--bad: #b3261e;--bad-soft: #fbe5e3;--warn: #8a5a00;--warn-soft: #fbf0d6;--mark: #fde7c8;--s-new: #c3c8d4;--s-learning: #e0a050;--s-reviewing: #3f86b8;--s-mastered: #2b8a5a;--shadow: 0 1px 2px rgba(23, 27, 38, .06), 0 4px 16px rgba(23, 27, 38, .05);--f-display: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;--f-body: "Figtree", ui-sans-serif, -apple-system, "Segoe UI", Roboto, sans-serif;--card-accent: #e0703a;--r: 12px;--tabs-h: 64px}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg: #11141b;--surface: #1a1e28;--surface-2: #232836;--ink: #eceef4;--ink-2: #b7bccb;--ink-3: #9198ab;--line: #2f3545;--accent: #f08b52;--accent-ink: #1a0d05;--accent-soft: 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var(--line);background:var(--bg)}.mm-t{font-family:var(--f-display);font-size:1.1rem;font-weight:600}.mm-n{color:var(--bad);font-weight:700;font-variant-numeric:tabular-nums}.mm-d{grid-column:1 / -1;color:var(--ink-3);overflow-wrap:anywhere}.jump{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}@media (min-width: 560px){.jump{grid-template-columns:repeat(4,1fr)}}.jump-b{display:flex;align-items:center;gap:10px;min-height:52px;padding:0 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg);font-weight:600;color:var(--ink)}.jump-b svg{color:var(--accent);flex:none}.xlist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;border-top:1px solid var(--line)}.xrow{display:flex;align-items:flex-start;gap:4px;border-bottom:1px solid var(--line)}.xrow-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px;padding:12px 0;border:0;background:none;text-align:left}.xrow-main:hover .xrow-text{color:var(--accent)}.xrow-top{display:flex;align-items:baseline;justify-content:space-between;gap:8px}.xrow-text{font-family:var(--f-display);font-size:1.25rem;font-weight:600;line-height:1.25}.xrow-def{color:var(--ink-2);font-size:.9375rem;line-height:1.45}.xrow-meta{font-size:.75rem;color:var(--ink-3);font-weight:600}.xrow .bm{margin-top:6px}.xmeta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-top:-8px}.xbody{display:flex;flex-direction:column;gap:14px}.xsec{display:flex;flex-direction:column;gap:8px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:16px}.xsec h3{font-size:.8125rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin-top:4px}.xsec h3:first-child{margin-top:0}.def{font-size:1.0625rem;font-weight:500}.example{margin:0;padding:4px 0 4px 14px;border-left:3px solid var(--accent);font-family:var(--f-display);font-size:1.1875rem;line-height:1.5;font-style:italic}.idiom-box{background:var(--idiom-soft);border-color:transparent}.idiom-box h3{color:var(--idiom)}.two{display:grid;gap:12px}@media (min-width: 600px){.two{grid-template-columns:1fr 1fr}}.two h4{font-size:.875rem;display:flex;align-items:center;gap:4px;margin-bottom:2px}.ok-h{color:var(--good)}.bad-h{color:var(--bad)}.facts{margin:0;display:grid;gap:8px}.facts div{display:grid;grid-template-columns:9.5em 1fr;gap:8px}.facts dt{font-size:.875rem;color:var(--ink-3);font-weight:600}.facts dd{margin:0;min-width:0}@media (max-width: 420px){.facts div{grid-template-columns:1fr;gap:0}}.patterns{margin:0;padding-left:1.1em;display:flex;flex-direction:column;gap:4px;font-family:var(--f-display);font-size:1.0625rem}.partners{display:flex;flex-wrap:wrap;gap:6px}.partner{padding:2px 10px;border-radius:14px;background:var(--surface-2);font-size:.875rem;font-weight:500}.mistake-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.mistake-list li{display:flex;flex-direction:column;gap:2px}.wrong,.right{display:flex;gap:6px;align-items:baseline}.wrong svg{color:var(--bad);flex:none;transform:translateY(2px)}.right svg{color:var(--good);flex:none;transform:translateY(2px)}.right{font-weight:600}.note{color:var(--ink-2);font-size:.875rem;padding-left:21px}.reveal summary{cursor:pointer;color:var(--accent);font-weight:600;min-height:44px;display:flex;align-items:center}.my-sentences{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.my-sentences li{display:flex;gap:8px;align-items:baseline;flex-wrap:wrap}.plain-list{margin:0;padding-left:1.1em;display:flex;flex-direction:column;gap:4px}.sess-top{display:flex;align-items:center;gap:8px}.bar{flex:1;height:8px;border-radius:4px;background:var(--surface-2);overflow:hidden}.bar span{display:block;height:100%;background:var(--accent);border-radius:4px;transition:width .3s ease}.sess-count{font-size:.875rem;font-weight:700;font-variant-numeric:tabular-nums;min-width:3.5em;text-align:right}.sess-meta{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;margin-top:-6px}.sess-meta svg{vertical-align:-2px}.type-label{font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}.ex{display:flex;flex-direction:column;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow)}.ask{font-weight:600;color:var(--ink-2)}.cloze{font-family:var(--f-display);font-size:1.375rem;line-height:1.5}.gap{display:inline-block;min-width:4.5em;border-bottom:2px solid var(--ink-3);text-align:center;padding:0 4px;font-weight:600}.gap.ok{color:var(--good);border-color:var(--good)}.gap.bad{color:var(--bad);border-color:var(--bad)}.options{display:flex;flex-direction:column;gap:8px}.opt{display:flex;align-items:center;gap:12px;min-height:52px;padding:10px 14px;border-radius:12px;border:1.5px solid var(--line);background:var(--bg);text-align:left;font-size:1rem;color:var(--ink)}.opt:hover:not(:disabled){border-color:var(--accent)}.opt:disabled{opacity:1;cursor:default}.opt-k{flex:none;width:26px;height:26px;display:grid;place-items:center;border-radius:7px;background:var(--surface-2);font-size:.8125rem;font-weight:700;color:var(--ink-2)}.opt-t{flex:1;min-width:0;overflow-wrap:anywhere}.opt.correct{border-color:var(--good);background:var(--good-soft);color:var(--ink)}.opt.correct svg{color:var(--good)}.opt.incorrect{border-color:var(--bad);background:var(--bad-soft)}.opt.incorrect svg{color:var(--bad)}.opt.dim{opacity:.55}.yn{display:grid;grid-template-columns:1fr 1fr;gap:8px}.yn-b{justify-content:center;font-weight:600}.yn-b 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var(--line);background:var(--bg);font-size:1.0625rem}.input:focus{outline:none;border-color:var(--accent)}.input.ok{border-color:var(--good)}.input.bad{border-color:var(--bad)}.input.area{resize:vertical;line-height:1.5}.input.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8125rem}.recall-form{display:flex;flex-direction:column;gap:10px}.fix-pair{line-height:1.6}.produce-card{background:var(--bg);border-radius:12px;padding:14px;display:flex;flex-direction:column;gap:4px}.produce-expr,.study-expr{font-family:var(--f-display);font-size:1.6rem;font-weight:600;line-height:1.15}.task{font-weight:600}.self-check{display:flex;flex-direction:column;gap:10px}.detect{display:flex;gap:6px;align-items:baseline;font-size:.9375rem;font-weight:600}.detect.ok{color:var(--good)}.detect.bad{color:var(--warn)}.detect svg{flex:none;transform:translateY(2px)}.compare{background:var(--bg);border-radius:12px;padding:12px 14px;display:flex;flex-direction:column;gap:6px}.compare 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