:root{--bg:#f6f3ec;--surface:#fffdf8;--surface-2:#efe9dd;--ink:#1c1a16;--ink-2:#4a463e;--muted:#7f786b;--line:#e2dbcd;--line-strong:#cbc2b0;--gold:#f2c230;--gold-soft:#fbefc4;--gold-ink:#7a5b00;--red:#c8372b;--der:#2f6db0;--die:#c8372b;--das:#2b8a57;--shadow:0 1px 2px #1c1a160d, 0 8px 24px #1c1a1612;--topbar-h:56px;--toc-h:52px;--font-sans:"Inter", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;--font-display:"Fraunces", "Songti SC", "Noto Serif SC", Georgia, serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root{--bg:#13120f;--surface:#1c1a16;--surface-2:#27241e;--ink:#f2ede3;--ink-2:#cbc4b5;--muted:#918a7c;--line:#2f2c25;--line-strong:#443f35;--gold:#f2c230;--gold-soft:#3a3016;--gold-ink:#f5d56e;--red:#ef6a5a;--der:#7aaeea;--die:#f07468;--das:#5fc58d;--shadow:0 1px 2px #0000004d, 0 8px 24px #00000040;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--ink);font:16px/1.6 var(--font-sans);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;margin:0}h1,h2,h3,h4{margin:0;line-height:1.2}a{color:inherit}button{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--gold);outline-offset:2px}::selection{background:var(--gold);color:#1c1a16}.wrap{max-width:980px;margin:0 auto;padding-inline:24px}.eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--red);margin:0 0 8px;font-size:13px;font-weight:600}.hint{color:var(--muted);margin:8px 0 0;font-size:13px}.btn{background:var(--ink);color:var(--bg);cursor:pointer;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-size:15px;font-weight:600;text-decoration:none;transition:transform .15s,opacity .15s;display:inline-flex}.btn:hover{transform:translateY(-1px)}.btn:active{opacity:.85;transform:translateY(0)}.btn:disabled{opacity:.4;cursor:default;transform:none}.btn--small{padding:6px 12px;font-size:13px}.btn--small svg{width:14px;height:14px}.btn--large{padding:14px 26px;font-size:17px}.btn--ghost{color:var(--ink);border-color:var(--line-strong);background:0 0}.btn--icon{background:var(--surface);width:40px;height:40px;color:var(--ink);border-color:var(--line-strong);padding:0}.speak-btn{background:var(--surface-2);width:38px;height:38px;color:var(--ink);cursor:pointer;border:none;border-radius:50%;flex:none;place-items:center;padding:0;transition:background .15s,transform .15s;display:inline-grid}.speak-btn:hover{background:var(--gold-soft)}.speak-btn:active{transform:scale(.94)}.speak-btn.is-active{background:var(--gold);color:#1c1a16}.speak-btn--sm{width:30px;height:30px}.speak-btn--sm svg{width:15px;height:15px}.speak-btn--lg{width:52px;height:52px}.speak-btn--lg svg{width:24px;height:24px}.icon-speaker.is-playing .wave{animation:.9s ease-in-out infinite wave}.icon-speaker.is-playing .wave-2{animation-delay:.2s}@keyframes wave{0%,to{opacity:.25}50%{opacity:1}}.dw-btn{border:1px solid var(--line-strong);height:38px;color:var(--ink-2);white-space:nowrap;cursor:pointer;background:0 0;border-radius:999px;flex:none;align-items:center;gap:3px;padding:0 12px;font-size:13px;font-weight:600;transition:background .15s,border-color .15s;display:inline-flex}.dw-btn svg{width:14px;height:14px}.dw-btn--sm{height:26px;padding:0 8px;font-size:12px}.dw-btn--sm svg{width:12px;height:12px}.dw-btn:hover{border-color:var(--gold);background:var(--gold-soft)}.dw-btn.is-active{border-color:var(--gold);background:var(--gold);color:#1c1a16}.say{border:none;border-bottom:1.5px dotted var(--line-strong);font:inherit;text-align:inherit;cursor:pointer;background:0 0;border-radius:3px;padding:0 2px;transition:background .15s;display:inline}.say:hover,.say.is-active{background:var(--gold-soft);border-bottom-color:var(--gold)}.topbar{z-index:20;height:var(--topbar-h);background:color-mix(in srgb, var(--bg) 88%, transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0}.topbar__inner{grid-template-columns:1fr auto 1fr;grid-template-areas:"brand tabs tools";align-items:center;gap:12px;max-width:980px;height:100%;margin:0 auto;padding-inline:24px;display:grid}.topbar__home{grid-area:brand}.topbar__tools{grid-area:tools;justify-self:end}.tabs{background:var(--surface-2);border-radius:999px;grid-area:tabs;gap:2px;padding:3px;display:inline-flex}.tabs__tab{color:var(--ink-2);text-align:center;white-space:nowrap;border-radius:999px;padding:6px 18px;font-size:14px;font-weight:600;text-decoration:none;transition:background .15s,color .15s}.tabs__tab:hover{color:var(--ink)}.tabs__tab.is-active{background:var(--ink);color:var(--bg)}.topbar__home{text-decoration:none}.brand{font-family:var(--font-display);align-items:center;gap:10px;font-size:20px;font-weight:600;display:inline-flex}.brand__flag{gap:2px;display:inline-grid}.brand__flag i{border-radius:1.5px;width:18px;height:4px;display:block}.brand__flag i:first-child{background:var(--ink)}.brand__flag i:nth-child(2){background:var(--red)}.brand__flag i:nth-child(3){background:var(--gold)}.topbar__tools{gap:6px;display:flex}.toggle{border:1px solid var(--line-strong);color:var(--ink-2);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:6px;padding:5px 12px;font-size:13px;font-weight:500;display:inline-flex}.toggle:before{content:"";border:1.5px solid var(--muted);border-radius:50%;width:8px;height:8px}.toggle.is-on{border-color:var(--gold);background:var(--gold-soft);color:var(--gold-ink)}.toggle.is-on:before{border-color:var(--gold);background:var(--gold)}.hero{padding:64px 0 24px}.hero h1{font-weight:600}.hero h1 .say{font-family:var(--font-display);letter-spacing:-.02em;border-bottom-width:3px;font-size:clamp(64px,14vw,128px);line-height:1}.hero__zh{margin-top:16px;font-size:clamp(22px,4vw,32px);font-weight:700;display:block}.hero__lead{max-width:52ch;color:var(--ink-2);margin:16px 0 28px;font-size:17px}.hero__actions{flex-wrap:wrap;gap:12px;display:flex}.part{border-top:2px solid var(--ink);scroll-margin-top:calc(var(--topbar-h) + 16px);margin-top:72px;padding-top:28px}.part__num{letter-spacing:.08em;color:var(--red);font-size:13px;font-weight:700}.part__head h1,.part__head h2{margin-top:6px;font-size:clamp(28px,5vw,36px);font-weight:700}.part__head h1 span,.part__head h2 span{font-family:var(--font-display);color:var(--muted);margin-left:6px;font-style:italic;font-weight:500}.part__head .part__sub{font-family:var(--font-sans);vertical-align:.25em;font-size:.5em;font-style:normal;font-weight:600}.page{padding-top:40px}.page__head{margin-bottom:28px}.part__head p{max-width:60ch;color:var(--ink-2);margin:10px 0 0}.unit{margin-top:40px}.unit__head{border-bottom:1px solid var(--line);flex-wrap:wrap;align-items:baseline;gap:4px 12px;padding-bottom:12px;display:flex}.unit__head h3{font-size:20px}.unit__head span{font-family:var(--font-display);color:var(--muted);font-style:italic}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,280px),1fr));gap:16px;margin-top:20px;display:grid}.lesson-card{border:1px solid var(--line);background:var(--surface);border-radius:18px;flex-direction:column;gap:4px;padding:22px;text-decoration:none;transition:transform .2s,box-shadow .2s;display:flex}a.lesson-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}.lesson-card__num{font-family:var(--font-display);color:var(--red);font-size:15px;font-weight:600}.lesson-card__title{font-family:var(--font-display);font-size:36px;font-weight:600;line-height:1.1}.lesson-card__zh{font-weight:600}.lesson-card__summary{color:var(--muted);margin-top:4px;font-size:14px}.lesson-card__meta{flex-wrap:wrap;gap:6px;margin-top:12px;display:flex}.lesson-card__meta span{background:var(--surface-2);color:var(--ink-2);border-radius:999px;padding:2px 10px;font-size:12px}.lesson-card__meta .lesson-card__score{background:var(--gold-soft);color:var(--gold-ink)}.lesson-card--soon{min-height:160px;color:var(--muted);background:0 0;border-style:dashed;justify-content:center}.lesson-card--soon .lesson-card__num{color:var(--muted)}.resource-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,400px),1fr));gap:16px;margin-top:28px;display:grid}.resource{border:1px solid var(--line);background:var(--surface);border-radius:18px;flex-direction:column;gap:2px;padding:20px 22px;text-decoration:none;transition:transform .2s,box-shadow .2s;display:flex}.resource:hover{box-shadow:var(--shadow);transform:translateY(-3px)}.resource__top{color:var(--muted);justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.resource:hover .resource__top svg{color:var(--ink)}.platform{letter-spacing:.04em;color:var(--ink-2);align-items:center;gap:6px;font-size:12px;font-weight:700;display:inline-flex}.platform:before{content:"";border-radius:50%;width:8px;height:8px}.platform--youtube:before{background:#e62117}.platform--spotify:before{background:#1db954}.resource__name{font-family:var(--font-display);font-size:30px;font-weight:600;line-height:1.15}.resource__by{color:var(--muted);font-size:13px}.resource__desc{color:var(--ink-2);margin-top:10px;font-size:15px}.resource__meta{flex-wrap:wrap;align-items:center;gap:6px;margin-top:14px;display:flex}.resource__tag{background:var(--surface-2);color:var(--ink-2);border-radius:999px;padding:2px 10px;font-size:12px}.level{color:var(--muted);align-items:center;gap:3px;margin-left:auto;font-size:12px;display:inline-flex}.level i{background:var(--line-strong);border-radius:50%;width:7px;height:7px}.level i.is-on{background:var(--gold)}.level i:last-of-type{margin-right:4px}.lesson-hero{padding-top:32px;padding-bottom:32px}.crumb{color:var(--muted);align-items:center;gap:6px;margin-bottom:28px;font-size:14px;text-decoration:none;display:inline-flex}.crumb svg{width:15px;height:15px}.crumb:hover{color:var(--ink)}.lesson-hero h1{font-family:var(--font-display);letter-spacing:-.02em;font-size:clamp(52px,10vw,84px);font-weight:600;line-height:1}.lesson-hero__zh{margin:12px 0 0;font-size:20px;font-weight:700}.lesson-hero__summary{max-width:56ch;color:var(--ink-2);margin:8px 0 0}.toc{top:var(--topbar-h);z-index:10;background:color-mix(in srgb, var(--bg) 92%, transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky}.toc__inner{height:var(--toc-h);scrollbar-width:none;align-items:center;gap:4px;display:flex;position:relative;overflow-x:auto}.toc__inner::-webkit-scrollbar{display:none}.toc__item{color:var(--muted);white-space:nowrap;cursor:pointer;background:0 0;border:none;border-radius:999px;flex:none;align-items:center;gap:6px;padding:6px 12px;font-size:14px;display:inline-flex}.toc__item span{font-variant-numeric:tabular-nums;opacity:.7;font-size:11px}.toc__item:hover{color:var(--ink)}.toc__item.is-active{background:var(--surface-2);color:var(--ink);font-weight:600}.section{scroll-margin-top:calc(var(--topbar-h) + var(--toc-h));padding-top:56px}.section__head{align-items:flex-start;gap:14px;margin-bottom:20px;display:flex}.section__num{font-family:var(--font-display);color:var(--gold-ink);font-size:28px;font-weight:600;line-height:1.1}.section__head h2{font-size:26px}.section__head p{font-family:var(--font-display);color:var(--muted);margin:4px 0 0;font-size:17px;font-style:italic}.lead{max-width:62ch;color:var(--ink-2);margin:0 0 16px;font-size:16px}.block-heading{font-family:var(--font-display);align-items:center;gap:12px;margin:32px 0 14px;font-size:19px;font-weight:600;display:flex}.block-heading:after{content:"";background:var(--line);flex:1;height:1px}.scale{border:1px solid var(--line);background:var(--surface);border-radius:16px;max-width:560px;margin:0;padding:0;list-style:none;overflow:hidden}.scale li{border-top:1px solid var(--line);grid-template-columns:14px 1fr auto;align-items:center;gap:14px;padding:12px 18px;display:grid}.scale li:first-child{border-top:none}.scale__dot{background:hsl(calc(145 - var(--level) * 140) 60% 46%);border-radius:50%;width:12px;height:12px}.scale .say{justify-self:start;font-size:18px;font-weight:600}.scale__zh{color:var(--muted);font-size:14px}.words{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:8px;display:flex}.words__label{color:var(--muted);margin-right:4px;font-size:13px;font-weight:600}.words .say,.register__cell .say{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:5px 12px}.words .say:hover,.words .say.is-active,.register__cell .say:hover,.register__cell .say.is-active{background:var(--gold-soft);border-color:var(--gold)}.words strong{font-family:var(--font-display);font-size:17px;font-weight:600}.words__zh{color:var(--muted);font-size:13px}.dialogues__grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,420px),1fr));gap:16px;display:grid}.dialogue{border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:16px 16px 10px;transition:border-color .2s,box-shadow .2s}.dialogue.is-playing{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-soft)}.dialogue__head{justify-content:space-between;align-items:center;gap:12px;padding:0 4px;display:flex}.dialogue__title{flex-wrap:wrap;align-items:center;gap:6px 8px;display:flex}.dialogue__title h4{font-size:15px;font-weight:600}.dialogue__head .btn{flex:none}.badge{white-space:nowrap;border-radius:999px;padding:1px 8px;font-size:12px;font-weight:600}.badge--formell{border:1px solid var(--line-strong);color:var(--ink-2)}.badge--informell{border:1px solid var(--gold);background:var(--gold-soft);color:var(--gold-ink)}.dialogue__lines{gap:2px;margin:10px 0 0;padding:0;list-style:none;display:grid}.line{grid-template-columns:5.5em 1fr;align-items:start;display:grid}.line__speaker{color:var(--muted);overflow-wrap:anywhere;align-items:baseline;gap:6px;padding:9px 4px 0;font-size:13px;font-weight:600;display:flex}.line__speaker:before{content:"";border-radius:50%;flex:none;width:6px;height:6px;transform:translateY(-1px)}.line--female .line__speaker:before{background:var(--die)}.line--male .line__speaker:before{background:var(--der)}.line__body{text-align:left;cursor:pointer;background:0 0;border:none;border-radius:10px;width:100%;padding:7px 10px;transition:background .15s;display:block}.line__body:hover{background:var(--surface-2)}.line.is-active .line__body{background:var(--gold-soft)}.line__de{font-size:17px;font-weight:500;display:block}.line__zh{color:var(--muted);margin-top:1px;font-size:14px;display:block}.tg__display{color:#1c1a16;border-radius:20px;grid-template-columns:auto 1fr auto;align-items:center;gap:24px;padding:22px 24px;transition:background .4s;display:grid}.tg__display--morning{background:linear-gradient(135deg,#fdecb4,#f6c867)}.tg__display--day{background:linear-gradient(135deg,#dcf0fb,#9fcbea)}.tg__display--evening{color:#fff;background:linear-gradient(135deg,#4d5296,#262a55)}.tg__time{font-family:var(--font-display);font-variant-numeric:tabular-nums;font-size:46px;font-weight:600;line-height:1}.tg__time span{opacity:.7;font-size:18px}.tg__greeting span{font-family:var(--font-display);font-size:30px;font-weight:600;line-height:1.15;display:block}.tg__greeting small{opacity:.75;font-size:14px}.tg__display .speak-btn{color:#1c1a16;background:#ffffff8c}.tg__display .speak-btn.is-active{background:#fff}.tg__track{gap:3px;height:40px;margin-top:14px;display:flex;position:relative}.tg__band{color:#1c1a16;opacity:.45;cursor:pointer;border:none;flex-basis:0;font-size:12px;font-weight:600;transition:opacity .2s}.tg__band:first-child{border-radius:10px 0 0 10px}.tg__band:nth-last-child(2){border-radius:0 10px 10px 0}.tg__band.is-active{opacity:1}.tg__band--morning{background:#f6c867}.tg__band--day{background:#9fcbea}.tg__band--evening{color:#fff;background:#4d5296}.tg__range{appearance:none;pointer-events:none;background:0 0;width:100%;margin:0;position:absolute;inset:-6px 0}.tg__range::-webkit-slider-runnable-track{background:0 0;height:100%}.tg__range::-moz-range-track{background:0 0}.tg__range::-webkit-slider-thumb{-webkit-appearance:none;border:3px solid var(--bg);background:var(--ink);cursor:grab;pointer-events:auto;border-radius:6px;width:10px;height:52px}.tg__range::-moz-range-thumb{border:3px solid var(--bg);background:var(--ink);cursor:grab;pointer-events:auto;border-radius:6px;width:4px;height:46px}.tg__cards{grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:12px;margin-top:20px;display:grid}.tg__card{border:1px solid var(--line);background:var(--surface);border-radius:14px;padding:14px 16px;transition:border-color .2s}.tg__card.is-active{border-color:var(--gold)}.tg__card-time{color:var(--muted);font-variant-numeric:tabular-nums;font-size:12px}.tg__card .say{font-family:var(--font-display);font-size:22px;font-weight:600}.tg__card p{color:var(--ink-2);margin:6px 0 0;font-size:14px}.register{border:1px solid var(--line);background:var(--surface);border-radius:16px;overflow:hidden}.register__row{border-top:1px solid var(--line);grid-template-columns:110px 1fr 1fr;display:grid}.register__row--head{background:var(--surface-2);border-top:none}.register__col{padding:16px}.register__col strong{font-family:var(--font-display);font-size:20px;font-weight:600}.register__col>span{border-radius:999px;margin-left:8px;padding:1px 8px;font-size:13px;font-weight:600}.register__col--informell>span{background:var(--gold-soft);color:var(--gold-ink)}.register__col--formell>span{border:1px solid var(--line-strong);color:var(--ink-2)}.register__col p{color:var(--muted);margin:6px 0 0;font-size:13px}.register__label{color:var(--ink-2);padding:16px;font-size:14px;font-weight:600}.register__cell{flex-wrap:wrap;align-content:flex-start;gap:6px;padding:12px 16px;display:flex}.legend{color:var(--muted);flex-wrap:wrap;align-items:center;gap:4px 6px;margin-bottom:8px;font-size:13px;display:flex}.legend .article{margin-left:8px}.legend .article:first-child{margin-left:0}.article{font-weight:700}.article--der{color:var(--der)}.article--die{color:var(--die)}.article--das{color:var(--das)}.article--pl{color:var(--muted)}.pl-tag{border:1px solid var(--line-strong);font-family:var(--font-sans);color:var(--muted);vertical-align:2px;border-radius:4px;margin-left:6px;padding:0 6px;font-size:11px;font-weight:600}.vocab{grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr));column-gap:32px;margin:0;padding:0;list-style:none;display:grid}.vocab__item{border-bottom:1px solid var(--line);align-items:flex-start;gap:12px;padding:12px 0;display:flex}.vocab__play{flex-direction:column;flex:none;align-items:center;gap:6px;min-width:56px;margin-top:1px;display:flex}.vocab__hint{margin:0 0 4px}.vocab__examples{margin:6px 0 0;padding:0;font-size:14px;list-style:none}.vocab__examples span{color:var(--muted)}.vocab__de{font-size:17px;font-weight:600}.vocab__plural{color:var(--muted);font-size:14px;font-weight:400}.vocab__zh{color:var(--ink-2)}.vocab__note{color:var(--muted);margin-top:2px;font-size:13px}.phrases{border:1px solid var(--line);background:var(--surface);border-radius:16px;margin:0;padding:0;list-style:none;overflow:hidden}.phrases li{border-top:1px solid var(--line);grid-template-columns:auto minmax(0,1fr) minmax(0,1fr);align-items:center;gap:14px;padding:10px 16px;display:grid}.phrases li:first-child{border-top:none}.phrases__de{font-size:17px;font-weight:600}.phrases__zh{color:var(--muted);font-size:14px}.phrases+.block-heading,.dialogues+.block-heading{margin-top:28px}.tips{border-left:3px solid var(--gold);background:var(--surface);border-radius:0 12px 12px 0;margin-top:16px;padding:12px 16px}.tips ul{margin:0;padding-left:18px}.tips li{color:var(--ink-2);font-size:15px}.tips li+li{margin-top:4px}.abc{gap:10px;display:grid}.abc__row{align-items:center;gap:12px;display:flex}.abc__keys{flex-wrap:wrap;gap:8px;display:flex}.abc__key{border:1px solid var(--line);background:var(--surface);width:58px;height:58px;font-family:var(--font-display);cursor:pointer;border-radius:14px;justify-content:center;align-items:baseline;gap:2px;padding-top:10px;font-size:26px;font-weight:600;transition:background .15s,border-color .15s,transform .15s;display:inline-flex}.abc__key small{color:var(--muted);font-size:16px;font-weight:500}.abc__key:hover{border-color:var(--gold)}.abc__key.is-active{border-color:var(--gold);background:var(--gold-soft);transform:translateY(-2px)}.abbrs{grid-template-columns:repeat(auto-fill,minmax(min(100%,210px),1fr));gap:12px;display:grid}.abbr{border:1px solid var(--line);background:var(--surface);border-radius:14px;flex-direction:column;gap:4px;padding:14px 16px;display:flex}.abbr__head{justify-content:space-between;align-items:center;gap:8px;display:flex}.abbr__abbr{font-family:var(--font-display);letter-spacing:.06em;font-size:28px;font-weight:700}.abbr__full{color:var(--ink-2);overflow-wrap:anywhere;font-size:14px}.abbr__zh{color:var(--muted);font-size:14px}.nametool{border:1px solid var(--gold);background:var(--surface);box-shadow:0 0 0 3px var(--gold-soft);border-radius:16px;padding:18px}.nametool__label{margin-bottom:8px;font-weight:700;display:block}.nametool__row .spell__input{width:100%;max-width:360px}.nametool__codes{flex-wrap:wrap;gap:6px;margin:14px 0 0;padding:0;list-style:none;display:flex}.nametool__codes li{background:var(--surface-2);border-radius:999px;align-items:baseline;gap:6px;padding:4px 12px;display:inline-flex}.nametool__codes b{font-family:var(--font-display);color:var(--gold-ink)}.nametool__actions{flex-wrap:wrap;gap:8px;margin-top:14px;display:flex}.stable__grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,210px),1fr));column-gap:24px;margin-top:24px;display:grid}.stable__cell{border-bottom:1px solid var(--line);align-items:baseline;gap:12px;padding:9px 4px;display:flex}.stable__cell b{width:2.2em;font-family:var(--font-display);flex:none;font-size:20px}.stable__cell small{color:var(--muted);margin-left:6px;font-size:12px}.stable__grid--symbols{margin-top:0}.fill__list{counter-reset:fill;margin:16px 0 0;padding:0;list-style:none}.fill__item{border-top:1px solid var(--line);counter-increment:fill;padding:14px 0 14px 34px;position:relative}.fill__item:first-child{border-top:none}.fill__item:before{content:counter(fill);background:var(--surface-2);width:22px;height:22px;color:var(--ink-2);border-radius:50%;place-items:center;font-size:12px;font-weight:700;display:grid;position:absolute;top:15px;left:0}.fill__item.is-done:before{background:var(--das);color:var(--bg)}.fill__item.is-context:before{background:var(--surface-2);color:var(--muted)}.fill__gap.is-current{border-bottom-color:var(--gold)}.fill+.fill{margin-top:16px}.fill__sentence{flex-wrap:wrap;align-items:baseline;gap:0 6px;font-size:17px;font-weight:500;display:flex}.fill__sentence>svg{color:var(--das);align-self:center}.fill__before{color:var(--ink-2)}.fill__before .say{font-weight:400}.fill__gap{border-bottom:2px solid var(--line-strong);min-width:3.2em;color:var(--muted);text-align:center;padding:0 6px;display:inline-block}mark.fill__gap{border-bottom-color:var(--das);background:color-mix(in srgb, var(--das) 14%, transparent);color:var(--ink);border-radius:4px 4px 0 0;font-weight:700}.fill__zh{color:var(--muted);margin:4px 0 0;font-size:14px}.fill__options{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.fill__item.is-done .fill__options{display:none}.fill__option{border:1.5px solid var(--line-strong);background:var(--bg);cursor:pointer;border-radius:999px;padding:6px 16px;font-size:16px;font-weight:600}.fill__option:not(:disabled):hover{border-color:var(--ink)}.fill__option.is-wrong{border-color:var(--die);color:var(--die);cursor:default;text-decoration:line-through}.dtable+.dtable,.conjs+.tips{margin-top:0}.dtable__scroll{border:1px solid var(--line);background:var(--surface);border-radius:14px;overflow-x:auto}.dtable table{border-collapse:collapse;width:100%}.dtable th,.dtable td{text-align:left;border-top:1px solid var(--line);padding:10px 16px}.dtable th{background:var(--surface-2);color:var(--ink-2);border-top:none;font-size:13px;font-weight:600}.dtable td{font-size:16px}.dtable td .say{font-weight:600}.builder__persons{flex-wrap:wrap;gap:6px;margin-top:14px;display:flex}.builder__fields{grid-template-columns:repeat(auto-fit,minmax(min(100%,190px),1fr));gap:12px;margin-top:14px;display:grid}.builder__field{color:var(--muted);flex-direction:column;gap:4px;font-size:13px;display:flex}.builder__field input,.builder__field select{border:1.5px solid var(--line-strong);background:var(--bg);color:var(--ink);font:500 16px var(--font-sans);border-radius:10px;padding:9px 12px}.builder__field input:focus,.builder__field select:focus{border-color:var(--gold);outline:none}.builder__out{background:var(--bg);border-radius:12px;margin-top:16px;padding:14px 16px}.builder__out ol{margin:0 0 12px;padding-left:20px}.builder__out li{padding:3px 0}.builder__out li .say{font-size:18px;font-weight:600}.builder__out li span{color:var(--muted);margin-left:10px;font-size:14px}.conjs{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));gap:14px;margin-top:24px;display:grid}.conj{border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:16px 18px}.conj__head{align-items:baseline;gap:10px;margin-bottom:8px;display:flex}.conj__head .say{font-family:var(--font-display);font-size:24px;font-weight:600}.conj__head span{color:var(--muted)}.conj__table{border-collapse:collapse;width:100%}.conj__table td{border-top:1px solid var(--line);vertical-align:baseline;padding:8px 0}.conj__num,.conj__person{width:1%;color:var(--muted);white-space:nowrap;font-size:13px;padding-right:14px!important}.conj__form{font-size:18px}.conj__form b{color:var(--ink-2);font-weight:700}.conj__form mark{background:var(--gold-soft);color:var(--gold-ink);border-radius:3px;padding:0 1px;font-weight:700}.conj__note{color:var(--muted);margin:10px 0 0;font-size:13px}.seg{border:1px solid var(--line);background:var(--surface);border-radius:999px;flex-wrap:wrap;gap:2px;padding:3px;display:inline-flex}.seg__btn{color:var(--ink-2);cursor:pointer;background:0 0;border:none;border-radius:999px;padding:6px 16px;font-size:14px;font-weight:600}.seg__btn.is-on{background:var(--ink);color:var(--bg)}.seg--small .seg__btn{padding:4px 12px;font-size:13px}.seg--views{margin-bottom:16px}.seg--views .seg__btn{padding:8px 22px;font-size:15px}.vbook__filters{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.vbook__search{border:1.5px solid var(--line-strong);background:var(--surface);color:var(--muted);border-radius:12px;flex:260px;align-items:center;gap:8px;padding:0 12px;display:flex}.vbook__search:focus-within{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-soft)}.vbook__search input{min-width:0;height:42px;color:var(--ink);font:500 16px var(--font-sans);background:0 0;border:none;outline:none;flex:1}.vbook__select{border:1.5px solid var(--line-strong);background:var(--surface);height:45px;color:var(--ink);font:500 15px var(--font-sans);border-radius:12px;padding:0 12px}.vbook__chips{flex-wrap:wrap;gap:6px;display:flex}.chip{border:1.5px solid var(--line-strong);background:var(--surface);cursor:pointer;border-radius:999px;align-items:center;gap:4px;padding:6px 12px;font-size:14px;font-weight:700;display:inline-flex}.chip svg{width:14px;height:14px}.chip small{opacity:.75;font-weight:600}.chip--der{color:var(--der)}.chip--die{color:var(--die)}.chip--das{color:var(--das)}.chip--other{color:var(--ink-2)}.chip--star{color:var(--gold-ink)}.chip.is-on{background:color-mix(in srgb, currentColor 12%, var(--surface));border-color:currentColor}.vbook__status{color:var(--muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin:18px 0 10px;font-size:14px;display:flex}.vbook__group .block-heading a{color:inherit;text-decoration:none}.vbook__group .block-heading a:hover{color:var(--red)}.vbook__lessons{flex-wrap:wrap;gap:4px;margin-top:6px;display:flex}.vbook__lesson{background:var(--surface-2);color:var(--ink-2);border-radius:999px;padding:1px 8px;font-size:12px;text-decoration:none}.vbook__lesson:hover{background:var(--gold-soft)}.vbook__empty{text-align:center;color:var(--muted);padding:48px 0}.star-btn{width:34px;height:34px;color:var(--line-strong);cursor:pointer;background:0 0;border:none;border-radius:50%;flex:none;place-items:center;margin-left:auto;display:grid}.star-btn svg{width:19px;height:19px}.star-btn:hover,.star-btn.is-on{color:var(--gold)}.vquiz__setup{justify-items:start;gap:14px;margin-top:18px;display:grid}.vquiz__row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.vquiz__row>span{width:3em;color:var(--muted);font-size:14px}.vquiz__prompt{align-items:center;gap:14px;min-height:64px;margin:4px 0 18px;display:flex}.vquiz__word{font-family:var(--font-display);font-size:clamp(30px,6vw,44px);font-weight:600;line-height:1.15}.vquiz__word--zh{font-family:var(--font-sans);font-size:clamp(24px,5vw,32px);font-weight:700}.vquiz__listen{font-family:var(--font-display);color:var(--muted);font-size:22px;font-weight:600}.vquiz__listen .vword{color:var(--ink)}.vquiz__wrong{max-width:560px;margin:8px auto 0;padding:0;list-style:none}.vquiz__wrong li{border-top:1px solid var(--line);align-items:center;gap:10px;padding:8px 0;font-size:17px;font-weight:600;display:flex}.vquiz__wrong li>span:last-child{color:var(--muted);font-size:14px;font-weight:400}.vquiz__actions{flex-wrap:wrap;justify-content:center;gap:10px;margin-top:20px;display:flex}.vquiz .quiz__feedback p .vword{margin:0 4px;font-weight:700}.wgroups{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:14px;display:grid}.wgroup{border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:16px;transition:border-color .2s,box-shadow .2s}.wgroup.is-playing{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-soft)}.wgroup__head{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:8px;display:flex}.wgroup__head h4{font-family:var(--font-display);font-size:21px;font-weight:600}.wgroup__head span{color:var(--muted);font-size:13px}.btn--round{flex:none;width:34px;height:34px}.btn--round svg{width:14px;height:14px}.wgroup__list{margin:0;padding:0;list-style:none}.wgroup__item{align-items:center;gap:6px;display:flex}.wgroup__word{text-align:left;cursor:pointer;background:0 0;border:none;border-radius:10px;flex:1;justify-content:space-between;align-items:baseline;gap:12px;width:100%;min-width:0;padding:8px 10px;font-size:17px;font-weight:600;display:flex}.wgroup__word:hover{background:var(--surface-2)}.wgroup__word.is-active{background:var(--gold-soft)}.wgroup__zh{color:var(--muted);font-size:14px;font-weight:400}.transforms+.transforms .block-heading{margin-top:40px}.transforms__grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr));align-items:start;gap:14px;display:grid}.tgroup{border:1px solid var(--line);background:var(--surface);border-radius:16px;padding:16px}.tgroup__head{margin-bottom:8px}.tgroup__title{background:var(--ink);color:var(--bg);font-variant-numeric:tabular-nums;border-radius:8px;padding:2px 10px;font-size:14px;font-weight:700;display:inline-block}.tgroup__head p{color:var(--muted);margin:8px 0 0;font-size:13px}.tgroup__rows{margin:0;padding:0;list-style:none}.tgroup__rows li{border-top:1px solid var(--line);grid-template-columns:1fr auto 1fr;align-items:center;gap:8px;padding:7px 0;font-size:15px;display:grid}.tgroup__rows li:first-child{border-top:none}.tgroup__rows .say{white-space:nowrap;border-bottom:none;justify-self:start}.tgroup__arrow{color:var(--muted)}.tgroup__rows mark{background:var(--gold-soft);color:var(--gold-ink);border-radius:3px;padding:0 1px;font-weight:700}.practice{border:1px solid var(--line);background:var(--surface);border-radius:18px;margin-top:20px;padding:20px}.practice:first-of-type{margin-top:0}.practice__head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:4px 12px;display:flex}.practice__head h4{font-size:18px}.practice__head .hint{margin:0}.score{color:var(--ink-2);font-weight:600}.flash{max-width:520px;margin:18px auto 0;position:relative}.flash__card{aspect-ratio:16/10;perspective:1200px;cursor:pointer;background:0 0;border:none;width:100%;padding:0;display:block}.flash__inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.3,.7,.3,1);display:block;position:relative}.flash__card.is-flipped .flash__inner{transform:rotateY(180deg)}.flash__face{border:1px solid var(--line-strong);background:var(--bg);backface-visibility:hidden;text-align:center;border-radius:16px;flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:24px;display:flex;position:absolute;inset:0}.flash__back{background:var(--gold-soft);border-color:var(--gold);transform:rotateY(180deg)}.flash__de{font-family:var(--font-display);font-size:clamp(30px,7vw,46px);font-weight:600;line-height:1.15}.flash__zh{font-size:clamp(24px,5vw,32px);font-weight:700}.flash__sub{color:var(--muted);font-size:14px}.flash__speak{align-items:center;gap:8px;display:flex;position:absolute;top:12px;right:12px}.flash__controls{flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;margin-top:16px;display:flex}.flash__count{text-align:center;font-variant-numeric:tabular-nums;min-width:64px;color:var(--muted);font-size:14px}.listen__play{align-items:center;gap:14px;min-height:52px;margin:18px 0;display:flex}.listen__play>span{font-family:var(--font-display);color:var(--muted);font-size:22px;font-weight:600}.listen__play .vword{color:var(--ink)}.options{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid}.quiz .options{grid-template-columns:1fr;max-width:560px}.option{border:1.5px solid var(--line-strong);background:var(--bg);text-align:left;cursor:pointer;border-radius:12px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px 10px;padding:13px 16px;font-size:16px;font-weight:500;transition:border-color .15s,background .15s,opacity .15s;display:flex}.option:not(:disabled):hover{border-color:var(--ink)}.option:disabled{cursor:default}.option.is-right{border-color:var(--das);background:color-mix(in srgb, var(--das) 12%, var(--bg))}.option.is-wrong{border-color:var(--die);background:color-mix(in srgb, var(--die) 10%, var(--bg))}.option.is-dim{opacity:.5}.option.is-right svg{color:var(--das)}.option.is-wrong svg{color:var(--die)}.option__reveal{color:var(--ink-2);align-items:center;gap:6px;font-size:14px;display:inline-flex}.listen>.btn{margin-top:16px}.progress{background:var(--surface-2);border-radius:999px;height:4px;margin:14px 0 18px;overflow:hidden}.progress__bar{border-radius:inherit;background:var(--gold);height:100%;transition:width .3s}.quiz__prompt{align-items:center;gap:10px;margin-bottom:14px;display:flex}.quiz__prompt p{margin:0;font-size:18px;font-weight:600}.quiz__feedback{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-top:16px;display:flex}.quiz__feedback p{flex:260px;margin:0;font-size:15px}.quiz__feedback .ok{color:var(--das)}.quiz__feedback .bad{color:var(--die)}.quiz__result{text-align:center;padding:8px 0 4px}.quiz__score{font-family:var(--font-display);font-size:64px;font-weight:600;line-height:1}.quiz__score span{color:var(--muted);font-size:28px}.quiz__result p{color:var(--ink-2);margin:12px 0 18px}.artq{text-align:center}.artq__word{font-family:var(--font-display);margin-top:8px;font-size:clamp(34px,8vw,52px);font-weight:600;line-height:1.15}.artq__slot{border-bottom:3px solid var(--line-strong);min-width:2.4em;color:var(--muted);display:inline-block}.artq__zh{color:var(--muted);margin-top:6px}.artq__choices{justify-content:center;gap:10px;margin-top:20px;display:flex}.artq__btn{background:var(--bg);min-width:88px;font-family:var(--font-display);cursor:pointer;border:2px solid;border-radius:12px;padding:12px 18px;font-size:22px;font-weight:600;transition:background .15s,opacity .15s}.artq__btn--der{color:var(--der)}.artq__btn--die{color:var(--die)}.artq__btn--das{color:var(--das)}.artq__btn:not(:disabled):hover{background:color-mix(in srgb, currentColor 10%, var(--bg))}.artq__btn:disabled{cursor:default}.artq__btn--der.is-right{border-color:var(--der);background:var(--der)}.artq__btn--die.is-right{border-color:var(--die);background:var(--die)}.artq__btn--das.is-right{border-color:var(--das);background:var(--das)}.artq__btn.is-right{color:var(--bg)}.artq__btn.is-wrong{text-decoration:line-through}.artq__btn.is-dim{opacity:.4}.artq .quiz__feedback{text-align:center;justify-content:center}.artq .quiz__feedback p{flex:0 auto}.spell__prompt{align-items:center;gap:14px;margin:18px 0 14px;display:flex}.spell__hint{color:var(--ink-2)}.spell__row{gap:10px;max-width:520px;display:flex}.spell__input{border:1.5px solid var(--line-strong);background:var(--bg);min-width:0;color:var(--ink);font:600 19px var(--font-sans);border-radius:12px;flex:1;padding:11px 14px}.spell__row:has(.spell__input--wide){max-width:640px}.spell__input:focus{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-soft);outline:none}.spell__input.is-right{border-color:var(--das)}.spell__input.is-wrong{border-color:var(--die)}.spell__row .btn:disabled{opacity:.4;cursor:default;transform:none}.spell__keys{gap:6px;margin-top:10px;display:flex}.key{border:1px solid var(--line-strong);background:var(--surface-2);cursor:pointer;border-radius:8px;width:38px;height:36px;font-size:17px}.key:hover{background:var(--gold-soft)}.spell__feedback{flex-wrap:wrap;align-items:baseline;gap:4px 8px;margin:14px 0 0;display:flex}.spell__feedback.ok{color:var(--das)}.spell__feedback.bad{color:var(--die)}.spell__feedback .vword{font-family:var(--font-display);color:var(--ink);font-size:22px;font-weight:600}.lesson-nav{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;margin-top:72px;padding-top:24px;display:flex}.lesson-nav__link{align-items:center;gap:8px;font-weight:600;text-decoration:none;display:inline-flex}.lesson-nav__soon{color:var(--muted);margin:0;font-size:14px}.not-found{text-align:center;padding-top:96px;padding-bottom:48px}.not-found h1{font-family:var(--font-display);font-size:48px}.not-found p{color:var(--ink-2)}.footer{border-top:1px solid var(--line);text-align:center;color:var(--muted);margin-top:96px;padding:24px 16px 40px;font-size:13px}.footer p{margin:0}.footer__stats{font-variant-numeric:tabular-nums;opacity:.85;font-size:12px;margin-top:6px!important}@media (width<=640px){:root{--topbar-h:102px}.wrap,.topbar__inner{padding-inline:16px}.topbar__inner{grid-template-columns:1fr auto;grid-template-areas:"brand tools""tabs tabs";row-gap:8px;padding-block:8px}.tabs{display:flex}.tabs__tab{flex:1;padding:7px 0}.page{padding-top:28px}.brand{font-size:18px}.hero{padding-top:40px}.section{padding-top:44px}.section__head h2,.section__num{font-size:22px}.line{grid-template-columns:1fr}.line__speaker{padding:6px 10px 0}.tg__display{grid-template-columns:1fr auto;gap:12px 16px;padding:18px}.tg__time{grid-column:1/-1;font-size:38px}.tg__greeting span{font-size:26px}.register__row{grid-template-columns:1fr 1fr}.register__row--head>span:first-child{display:none}.register__label{grid-column:1/-1;padding:12px 16px 0}.register__col{padding:14px 12px}.register__col>span{margin:4px 0 0;display:inline-block}.register__cell{padding:10px 12px 14px}.register__cell .say{border-radius:10px;font-size:15px}.practice{padding:16px}.phrases li{grid-template-columns:auto minmax(0,1fr);gap:2px 12px}.phrases__zh{grid-column:2}.abc__key{width:48px;height:48px;padding-top:7px;font-size:22px}.abc__key small{font-size:14px}.options{grid-template-columns:1fr}.flash__card{aspect-ratio:4/3}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}