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var(--border);border-radius:var(--r-2xl);box-shadow:var(--sh-2);cursor:pointer;-webkit-tap-highlight-color:transparent;overscroll-behavior:contain;scrollbar-width:thin;flex-direction:column;grid-area:1/1;display:flex;overflow-y:auto}.flip-back{transform:rotateY(180deg)}.flip-hero{justify-content:center;align-items:center;gap:var(--sp-2);flex-direction:column;flex:1 0 auto;min-width:0;display:flex}.flip-label{font-size:var(--fs-xs);letter-spacing:.08em;text-transform:uppercase;color:var(--text-subtle);font-weight:600}.flip-hit{appearance:none;max-width:100%;padding:var(--sp-1) var(--sp-2);border-radius:var(--r-md);color:inherit;font:inherit;cursor:pointer;background:0 0;border:0;margin:0}.flip-hit:focus-visible{outline:2px solid color-mix(in srgb, var(--accent) 60%, transparent);outline-offset:8px;border-radius:var(--r-lg)}.flip-de{font-family:var(--display-font);font-size:clamp(2.25rem,1.6rem + 3vw,3.25rem);line-height:var(--lh-tight);letter-spacing:-.01em;overflow-wrap:anywhere;-webkit-hyphens:auto;hyphens:auto;text-wrap:balance;display:block}.flip-de.is-long{font-size:clamp(1.625rem,1.15rem + 2.2vw,2.375rem)}.flip-art{font-size:.8em}.flip-plural{font-size:var(--fs-sm);color:var(--text-muted)}.flip-speak{justify-content:center;gap:var(--sp-2);margin-top:var(--sp-1);display:flex}.flip-speak .btn{border-color:var(--border);width:44px;min-height:44px;color:var(--text-muted);box-shadow:none;background:0 0;padding:0}.flip-speak .btn:hover{border-color:var(--border-strong);background:color-mix(in srgb, var(--text) 5%, transparent);color:var(--text)}.flip-speak .sp-label{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.flip-notes{padding:0 var(--sp-4);border-radius:var(--r-lg);background:color-mix(in srgb, var(--surface-sunk) 24%, var(--surface-2));text-align:start;flex:none;display:grid}.flip-note{gap:var(--sp-1);padding:var(--sp-3) 0;overflow-wrap:anywhere;display:grid}.flip-note+.flip-note{border-top:1px solid var(--hairline)}.flip-note p{line-height:var(--lh-snug);margin:0}.flip-note-head{justify-content:space-between;align-items:center;min-height:20px;display:flex}.flip-say{width:44px;height:44px;color:var(--text-muted);cursor:pointer;background:0 0;border:0;border-radius:999px;place-items:center;margin:-12px -12px -12px 0;padding:0;transition:color .15s,background-color .15s;display:grid}.flip-say:is(:lang(ae),:lang(ar),:lang(arc),:lang(bcc),:lang(bqi),:lang(ckb),:lang(dv),:lang(fa),:lang(glk),:lang(he),:lang(ku),:lang(mzn),:lang(nqo),:lang(pnb),:lang(ps),:lang(sd),:lang(ug),:lang(ur),:lang(yi)){margin:-12px 0 -12px -12px}.flip-say svg{width:18px;height:18px}.flip-say:hover{color:var(--accent);background:color-mix(in srgb, var(--text) 6%, transparent)}.flip-example-de{font-size:var(--fs-md);color:var(--text)}.flip-example-tr{font-size:var(--fs-sm);color:var(--text-muted)}.flip-hint p{font-size:var(--fs-sm);color:var(--text-2)}.flip-tap{margin-top:calc(-1 * var(--sp-2));padding:var(--sp-5) 0 var(--sp-3);background:linear-gradient(to bottom, color-mix(in srgb, var(--surface-2) 0%, transparent), var(--surface-2) var(--sp-5));font-size:var(--fs-xs);color:var(--text-subtle);flex:none;position:sticky;bottom:0}.flip-img{aspect-ratio:1;width:clamp(120px,34vw,176px);height:auto;margin-bottom:var(--sp-2);border-radius:var(--r-xl);object-fit:cover;background:var(--surface-sunk)}.flip-tr{font-family:var(--display-font);font-size:clamp(1.875rem,1.35rem + 2.4vw,2.625rem);line-height:var(--lh-tight);overflow-wrap:anywhere;text-wrap:balance;display:block}.flip-de-small{max-width:100%;font-size:var(--fs-lg);color:var(--text-2);overflow-wrap:anywhere;-webkit-hyphens:auto;hyphens:auto}.flip-de-small.is-long{font-size:var(--fs-md)}.flip-rate{gap:var(--sp-2);flex:none;grid-template-columns:repeat(3,minmax(0,1fr));display:grid}.flip-rate-btn{--tone:var(--text);min-height:64px;padding:var(--sp-2);border:1px solid color-mix(in srgb, var(--tone) 32%, var(--border));border-radius:var(--r-lg);background:color-mix(in srgb, var(--tone) 8%, var(--surface-2));color:var(--text);font:inherit;text-align:center;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation;transition:background-color .15s ease, border-color .15s ease, transform .12s var(--ease-out);flex-direction:column;justify-content:center;align-items:center;gap:2px;line-height:1.2;display:flex;position:relative}.flip-rate-btn.is-dont{--tone:var(--danger)}.flip-rate-btn.is-almost{--tone:var(--warn)}.flip-rate-btn.is-know{--tone:var(--ok)}[data-theme=dark] .flip-rate-btn.is-dont{--tone:color-mix(in srgb, var(--danger) 82%, var(--text))}[data-theme=dark] .flip-rate-btn.is-almost{--tone:color-mix(in srgb, var(--warn) 82%, var(--text))}[data-theme=dark] .flip-rate-btn.is-know{--tone:color-mix(in srgb, var(--art-das) 82%, var(--text))}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .flip-rate-btn.is-dont{--tone:color-mix(in srgb, var(--danger) 82%, var(--text))}:root:not([data-theme=light]) .flip-rate-btn.is-almost{--tone:color-mix(in srgb, var(--warn) 82%, var(--text))}:root:not([data-theme=light]) .flip-rate-btn.is-know{--tone:color-mix(in srgb, var(--art-das) 82%, var(--text))}}.flip-rate-t{font-size:var(--fs-md);color:var(--tone);font-weight:650}.flip-rate-h{font-size:var(--fs-xs);color:var(--text-muted)}.flip-rate-k{top:6px;border:1px solid var(--border);min-width:18px;color:var(--text-subtle);font-variant-numeric:tabular-nums;border-radius:4px;padding:0 4px;font-size:11px;line-height:16px;display:none;position:absolute;inset-inline-start:8px}@media (hover:hover) and (pointer:fine){.flip-rate-k{display:block}.flip-rate-btn:hover:not(:disabled){background:color-mix(in srgb, var(--tone) 14%, var(--surface-2));border-color:color-mix(in srgb, var(--tone) 60%, var(--border))}}.flip-rate-btn:active:not(:disabled){background:color-mix(in srgb, var(--tone) 18%, var(--surface-2));transform:scale(.97)}.flip-rate-btn:focus-visible{outline:2px solid var(--tone);outline-offset:2px}.flip-rate-btn:disabled{cursor:progress}.flip-err{font-size:var(--fs-sm);color:var(--danger);text-align:center;margin:0}.flip-keys{font-size:var(--fs-xs);color:var(--text-subtle);text-align:center;margin:0}@media (hover:none){.flip-keys{display:none}}.flip-skel,.flip-skel-line{background:color-mix(in srgb, var(--text) 7%, var(--surface));box-shadow:none;cursor:default;border-color:#0000}.flip-skel-line{border-radius:999px;width:9rem;height:12px;display:block}span.flip-rate-btn.flip-skel{display:block}@media (prefers-reduced-motion:no-preference){.flip-run:not(.is-loading) .flip-card{animation:flip-enter .26s var(--ease-out) backwards}.flip-run.is-loading .flip-skel{animation:1.2s ease-in-out infinite alternate flip-pulse}}@keyframes flip-enter{0%{opacity:0;transform:translateY(6px)scale(.985)}}@keyframes flip-pulse{to{opacity:.55}}@media (prefers-reduced-motion:reduce){.flip-inner,.flip-bar>span{transition:none}.flip-card.is-flipped .flip-inner,.flip-back{transform:none}.flip-card:not(.is-flipped) .flip-back,.flip-card.is-flipped .flip-front{visibility:hidden}}@media (max-width:1023px){.shell:has(.flip-page){padding-top:max(8px, env(safe-area-inset-top))}.shell:has(.flip-page)>.footer{display:none}.flip-page{gap:var(--sp-3)}.flip-head h1{font-size:var(--fs-lg);line-height:var(--lh-snug)}.flip-head .subtle{font-size:var(--fs-sm)}.flip-sub{display:none}.flip-face{padding:var(--sp-4) var(--sp-4) 0;gap:var(--sp-3)}}@media (max-width:480px){.flip-rate-btn{min-height:56px}.flip-rate-h,.flip-rate-k{display:none}}@media (max-width:1023px) and (min-height:520px){.shell:has(.flip-page .flip-run){padding-bottom:0}.flip-page:has(.flip-run){height:calc(100dvh - max(8px, env(safe-area-inset-top)) - 61px - env(safe-area-inset-bottom));padding-bottom:var(--sp-3);overflow:visible clip}.flip-page>.flip-run,.flip-run>.flip-card{flex:auto;min-height:0}.flip-run .flip-inner{grid-template-rows:minmax(0,1fr);height:100%}.flip-run .flip-face{min-height:0}.flip-run .flip-img{width:auto;height:clamp(96px,24dvh,176px)}}@media (max-width:1023px) and (max-height:700px){.flip-run .flip-img{height:clamp(80px,18dvh,140px)}}.tone-bar{background:var(--surface-sunk);border-radius:999px;gap:2px;height:6px;display:flex;overflow:hidden}.tone-seg{flex-basis:0;min-width:4px;display:block}.tone-seg.is-green{background:var(--ok)}.tone-seg.is-yellow{background:var(--warn)}.tone-seg.is-red{background:var(--danger)}.tone-seg.is-new{background:color-mix(in srgb, var(--border-strong) 45%, var(--surface-sunk))}.theme-parts{gap:var(--sp-4)}.tone-blocks{gap:var(--sp-2);grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));margin:0;padding:0;list-style:none;display:grid}.tone-block{--tone-c:var(--text-subtle);--tone-soft:var(--surface-sunk);gap:4px var(--sp-3);padding:var(--sp-3);border-radius:var(--r-lg);background:color-mix(in srgb, var(--tone-soft) 70%, var(--surface));border:1px solid color-mix(in srgb, var(--tone-c) 35%, transparent);grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"head act""hint act";align-items:center;min-width:0;display:grid}.tone-block.is-green{--tone-c:var(--ok);--tone-soft:var(--ok-soft)}.tone-block.is-yellow{--tone-c:var(--warn);--tone-soft:var(--warn-soft)}.tone-block.is-red{--tone-c:var(--danger);--tone-soft:var(--danger-soft)}.tone-block[data-count="0"]{opacity:.78}.tone-block-head{align-items:center;gap:var(--sp-2);grid-area:head;min-width:0;display:flex}.tone-block-head strong{overflow-wrap:anywhere}.tone-dot{background:var(--tone-c);border-radius:50%;flex:none;width:10px;height:10px}.tone-block-n{white-space:nowrap;font-size:var(--fs-lg);color:var(--tone-c);flex:none;margin-inline-start:auto;font-weight:700}.tone-block-hint{font-size:var(--fs-xs);grid-area:hint;line-height:1.35}.tone-block-actions{gap:var(--sp-2);flex-wrap:wrap;grid-area:act;justify-content:flex-end;display:flex}.part-list{gap:var(--sp-2);grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));margin:0;padding:0;list-style:none;display:grid}.part{--part-c:var(--border-strong);--part-soft:var(--surface-sunk);border:1px solid var(--border);border-inline-start:4px solid var(--part-c);border-radius:var(--r-lg);background:var(--surface);align-items:stretch;min-width:0;display:flex}.part[data-tone=green]{--part-c:var(--ok);--part-soft:var(--ok-soft)}.part[data-tone=yellow]{--part-c:var(--warn);--part-soft:var(--warn-soft)}.part[data-tone=red]{--part-c:var(--danger);--part-soft:var(--danger-soft)}.part:target{box-shadow:0 0 0 2px var(--accent)}.part-main{align-items:center;gap:var(--sp-3);min-width:0;padding:10px var(--sp-3);min-height:64px;color:inherit;border-radius:var(--r-lg);flex:auto;text-decoration:none;display:flex}.part-main:hover{background:color-mix(in srgb, var(--text) 4%, transparent)}.part-n{background:var(--part-soft);width:34px;height:34px;color:var(--text);border:1.5px solid var(--part-c);border-radius:50%;flex:none;place-items:center;font-weight:700;display:grid}.part-body{flex:auto;gap:5px;min-width:0;display:grid}.part-title{align-items:baseline;gap:2px var(--sp-2);flex-wrap:wrap;min-width:0;display:flex}.part-status{font-size:var(--fs-xs);white-space:nowrap;background:var(--surface-sunk);color:var(--text-2,var(--text-muted));border-radius:999px;margin-inline-start:auto;padding:1px 8px;font-weight:600}.part-status.is-green{background:var(--ok-soft);color:var(--ok)}.part-status.is-yellow{background:var(--warn-soft);color:var(--warn)}.part-status.is-red{background:var(--danger-soft);color:var(--danger)}.part-preview{font-size:var(--fs-xs);white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.book-layer{padding:var(--sp-2) var(--sp-3);border:1px dashed var(--border-strong);border-radius:var(--r-md,10px);gap:4px;display:grid}.book-layer-lead{font-size:var(--fs-xs);margin:0;line-height:1.35}.book-chips{flex-wrap:wrap;align-items:center;gap:4px 6px;min-width:0;display:flex}.book-chips-prefix{font-size:var(--fs-xs);font-weight:600}.part .book-chip{font-size:var(--fs-xs);padding:0 7px;font-weight:500;line-height:1.5}.book-chip .num{font-weight:700}.book-chip-none{font-size:var(--fs-xs)}.part-cards{flex:none;align-self:center;margin-inline-end:6px}@media (max-width:479px){.tone-block{grid-template-columns:minmax(0,1fr);grid-template-areas:"head""hint""act"}.tone-block-actions{justify-content:flex-start}.part-cards{width:44px;padding:0}.part-cards-text{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}}.continue-card{gap:var(--sp-2);border-inline-start:4px solid var(--accent)}.continue-eyebrow{font-size:var(--fs-xs);letter-spacing:.04em;text-transform:uppercase;margin:0;font-weight:600}.continue-title,.continue-sub{overflow-wrap:anywhere;margin:0}.continue-card .tone-bar{max-width:420px}.part-train{flex:none;align-self:center;place-items:center;width:44px;min-height:44px;margin-inline-end:6px;padding:0;display:inline-grid}.part-train+.part-cards{margin-inline-start:0}.part .book-chips{opacity:.85}.part .book-chips-prefix{font-weight:500}.theme-aux{padding:0}.theme-aux-sum{align-items:baseline;gap:2px var(--sp-3);width:100%;min-height:48px;padding:var(--sp-3) var(--sp-4);cursor:pointer;color:inherit;font:inherit;text-align:start;border-radius:var(--r-lg);background:0 0;border:0;flex-wrap:wrap;padding-inline-end:40px;display:flex;position:relative}.theme-aux-sum:after{content:"▾";inset-inline-end:var(--sp-4);top:var(--sp-3);color:var(--text-subtle);position:absolute}.theme-aux-sum[aria-expanded=true]:after{content:"▴"}.theme-aux-sum:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.theme-aux-body[hidden]{display:none}.theme-aux-body{padding:0 var(--sp-4) var(--sp-4)}.theme-aux-body .lesson-goals h2{font-size:var(--fs-lg,1.15rem)}.theme-aux-tools{flex-wrap:wrap}.part-page h1{overflow-wrap:anywhere}.part-page-of{font-size:var(--fs-sm);font-weight:500}.part-hero{gap:var(--sp-2)}.part-hero .part-status{margin-inline-start:0}.part-hero .tone-bar{max-width:520px}.part-menu{gap:var(--sp-2);margin:0;padding:0;list-style:none;display:grid}.part-menu-row{align-items:center;gap:var(--sp-3);min-height:60px;padding:var(--sp-3) var(--sp-4);border:1px solid var(--border);border-radius:var(--r-lg);background:var(--surface);color:inherit;min-width:0;text-decoration:none;display:flex}a.part-menu-row:hover{background:color-mix(in srgb, var(--text) 4%, var(--surface))}a.part-menu-row:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.part-menu-fold{padding:0;display:block}.part-menu-fold>summary{align-items:center;gap:var(--sp-3);min-height:60px;padding:var(--sp-3) var(--sp-4);cursor:pointer;list-style:none;display:flex}.part-menu-fold>summary::-webkit-details-marker{display:none}.part-menu-fold>summary:after{content:"▾";color:var(--text-subtle);margin-inline-start:auto}.part-menu-fold[open]>summary:after{content:"▴"}.part-menu-fold>summary:focus-visible{outline:2px solid var(--accent);outline-offset:-2px;border-radius:var(--r-lg)}.part-menu-fold>:not(summary){margin:0 var(--sp-4) var(--sp-4)}.part-menu-ic{border-radius:var(--r-md,10px);background:var(--accent-soft,var(--surface-sunk));width:40px;height:40px;color:var(--accent);flex:none;place-items:center;display:grid}.part-menu-body{flex:auto;gap:2px;min-width:0;display:grid}.part-menu-body .subtle{overflow-wrap:anywhere}.part-menu-body .part-preview{white-space:normal}.part-dlg-list{gap:var(--sp-1,4px);padding:0;list-style:none;display:grid}.part-dlg-list a{align-items:center;min-height:44px;display:inline-flex}.part-nav{gap:var(--sp-2)}.grammar-themes{gap:var(--sp-3);margin:0;padding:0;list-style:none;display:grid}.grammar-theme h2{font-size:var(--fs-lg,1.15rem);overflow-wrap:anywhere}.grammar-theme h2 a{color:inherit}.grammar-theme[data-ready="0"]{opacity:.75}.grammar-toc{gap:var(--sp-1,4px) var(--sp-2);flex-wrap:wrap;margin:0;padding:0;list-style:none;display:flex}.grammar-toc a{min-height:44px;padding:0 var(--sp-3);border:1px solid var(--border);color:inherit;overflow-wrap:anywhere;border-radius:999px;align-items:center;gap:6px;text-decoration:none;display:inline-flex}.grammar-toc a:hover{border-color:var(--border-strong)}.grammar-toc a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.grammar-text{gap:var(--sp-4);min-width:0}.grammar-sec{gap:var(--sp-3);min-width:0;scroll-margin-top:80px;display:grid}.grammar-sec:target{outline:2px solid var(--accent);outline-offset:6px;border-radius:4px}.grammar-test{background:var(--surface-2)}.grammar-test .ex-sum-title{font-weight:600}.subtle-pill{color:var(--text-subtle)}