:root{--primary:#4f46e5;--primary-dark:#4038cb;--primary-soft:#ebedfd;--primary-line:#c7d2fe;--bg:#f8fafc;--bg-soft:#eef2f7;--card:#fff;--text:#0f1b2d;--muted:#5d6b81;--line:#e3e9f0;--line-strong:#cfd9e4;--ok:#16a34a;--shadow-card:0 1px 2px rgba(23,32,64,.05),0 8px 24px rgba(23,32,64,.07);--shadow-pop:0 2px 4px rgba(23,32,64,.06),0 24px 64px rgba(23,32,64,.14);--ring:0 0 0 3px rgba(79,70,229,.14)}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}[hidden]{display:none!important}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);overscroll-behavior-y:none;touch-action:manipulation;-webkit-text-size-adjust:100%}.container{max-width:1120px;margin:0 auto;padding:0 16px 48px}.practice-layout{display:block}.practice-main{min-width:0}@media (min-width:960px){.practice-layout{display:grid;grid-template-columns:minmax(0,640px) minmax(0,1fr);gap:24px;align-items:start}.container{padding:0 24px 80px}}.page h1{margin:0 0 12px;font-size:22px;line-height:1.35}.page h2{margin:22px 0 8px;font-size:17px}.page li,.page p{font-size:15px;line-height:1.7}.page p,.page ul{margin:0 0 12px}.page ul{padding-left:20px}.page li{margin-bottom:6px}.panel{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:var(--shadow-card);margin-bottom:16px}.handwriting-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:14px}.handwriting-title{margin:0;font-size:19px;line-height:1.3}.handwriting-sub{margin:5px 0 0;color:var(--muted);font-size:13px;line-height:1.55}.handwriting-board{position:relative;width:min(280px,82%);margin:0 auto;aspect-ratio:1/1;border:1px solid rgba(79,70,229,.35);border-radius:14px;overflow:hidden;background:#fff}#handwritingCanvas,.handwriting-board{touch-action:none;-webkit-user-select:none;-moz-user-select:none;user-select:none;-webkit-touch-callout:none}#handwritingCanvas{display:block;width:100%;height:100%;cursor:crosshair;-webkit-tap-highlight-color:transparent}.handwriting-toolbar{display:flex;gap:8px;margin-top:12px}.handwriting-toolbar .btn{flex:1;padding:12px 8px;font-size:14px}.handwriting-status{min-height:20px;margin-top:10px;color:var(--muted);font-size:13px;line-height:1.45}.handwriting-candidates{display:grid;grid-template-columns:repeat(auto-fill,minmax(72px,1fr));gap:8px;margin-top:12px}.handwriting-cand .cand-main{font-size:24px}.input-row{display:flex;gap:10px}#wordInput{flex:1;min-width:0;font-size:17px;padding:13px 14px;border:1.5px solid var(--line);border-radius:14px;outline:none;background:#fff;transition:border-color .15s ease,box-shadow .15s ease}#wordInput:focus{border-color:var(--primary);box-shadow:var(--ring)}.input-anchor,.input-anchor-inner{position:relative}.handwriting-pop{position:absolute;top:calc(100% + 8px);left:0;right:0;z-index:40;background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-pop);padding:14px}.handwriting-pop .handwriting-board{width:min(280px,100%)}.handwriting-board{cursor:crosshair}.handwriting-board svg{display:block;width:100%;height:100%;touch-action:none;-webkit-user-select:none;-moz-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}.handwriting-board svg path{fill:none;stroke:#1e3a8a;stroke-width:14;stroke-linecap:round;stroke-linejoin:round;filter:url(#hc-ink-pop)}.handwriting-close{border:0;background:transparent;font-size:16px;line-height:1;color:var(--muted);padding:6px 8px;border-radius:8px;cursor:pointer;-webkit-tap-highlight-color:transparent}.handwriting-close:hover{background:#f1f5f9;color:var(--text)}.input-mode-btn{flex:0 0 auto;width:50px;display:flex;align-items:center;justify-content:center;border:1.5px solid var(--line);border-radius:14px;background:#f1f5f9;color:#475569;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:background .15s ease,color .15s ease,border-color .15s ease,box-shadow .15s ease}.input-mode-btn:hover{border-color:var(--primary-line);color:var(--primary)}.input-mode-btn.active{border-color:var(--primary);background:var(--primary-soft);color:var(--primary)}.btn{border:0;border-radius:12px;font-size:15px;padding:12px 14px;background:var(--bg-soft);color:#35415a;touch-action:manipulation;cursor:pointer;font-family:inherit;transition:background .15s ease,color .15s ease,transform .1s ease,box-shadow .15s ease}.btn:hover{background:var(--line)}.btn:active{transform:scale(.97)}.btn:focus-visible{outline:none;box-shadow:var(--ring)}.btn:disabled{opacity:.55}.btn.primary{background:var(--primary);color:#fff;font-weight:600;box-shadow:0 2px 10px rgba(79,70,229,.35)}.btn.primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 18px rgba(79,70,229,.4)}.btn.off{opacity:.5}.card{background:var(--card);border-radius:16px;padding:16px;margin-bottom:16px;box-shadow:var(--shadow-card);border:1px solid var(--line)}#practice,.card{scroll-margin-top:70px}.card.complete{border-color:#86efac;box-shadow:0 1px 2px rgba(22,163,74,.08),0 2px 8px rgba(22,163,74,.1)}.card-head{display:flex;align-items:center;gap:14px;margin-bottom:8px}.char-big{font-size:44px;line-height:1;font-weight:700;display:flex;align-items:flex-start;gap:2px}.speak-btn{border:0;background:transparent;padding:4px 4px 4px 8px;margin-top:4px;font-size:19px;line-height:1;cursor:pointer;border-radius:8px;opacity:.8;transition:transform .12s ease,opacity .12s ease}.speak-btn:active{transform:scale(.82);opacity:1}.speak-btn.speaking{animation:speak-pulse .35s ease 2}@keyframes speak-pulse{0%,to{transform:scale(1)}50%{transform:scale(1.3)}}.char-meta{min-width:0}.char-pinyin{color:var(--muted);font-size:15px;min-height:20px}.char-en{color:var(--muted);font-size:12.5px;line-height:1.35;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.char-count{color:var(--muted);font-size:13px;margin-top:3px}.char-side{margin-left:auto;display:flex;flex-direction:column;align-items:flex-end;gap:5px;flex-shrink:0}.char-no{color:var(--muted);font-size:13px;flex-shrink:0}.done-badge{display:inline-block;padding:2px 9px;border-radius:999px;font-size:11px;font-weight:700;letter-spacing:.4px;line-height:1.5;background:#f0fdf4;color:var(--ok);border:1px solid #bbf7d0;white-space:nowrap;animation:done-pop .25s ease}@keyframes done-pop{0%{transform:scale(.6);opacity:0}to{transform:scale(1);opacity:1}}.hsk-badge{display:inline-block;padding:2px 9px;border-radius:999px;font-size:11px;font-weight:700;letter-spacing:.4px;line-height:1.5;background:var(--primary-soft);color:var(--primary);border:1px solid var(--primary-line);white-space:nowrap}.hsk-badge-phrase{background:#fff;font-size:11px;padding:2px 8px}.word-chip{display:inline-block;margin-left:8px;padding:2px 10px;border:1px solid var(--primary);border-radius:999px;font-size:13px;font-weight:600;color:var(--primary);background:var(--primary-soft);vertical-align:middle}.word-chip .chip-speak{border:0;background:transparent;padding:0 0 0 6px;font-size:12px;line-height:1;cursor:pointer;opacity:.85}.word-chip .chip-speak:active{transform:scale(.8)}.phrase-bar{margin-bottom:14px}.word-card{display:flex;align-items:center;gap:12px;width:100%;padding:7px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);text-align:left}.word-card-char{font-size:22px;font-weight:600;min-width:44px;flex-shrink:0;text-align:center}.word-card-meta{display:flex;flex-direction:column;gap:1px;min-width:0;flex:1}.word-card-pinyin{font-size:12px}.word-card-en,.word-card-pinyin{color:var(--muted);line-height:1.3}.word-card-en{font-size:11.5px}.phrase-speak{flex-shrink:0;width:28px;height:28px;padding:0;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;line-height:1;background:var(--primary-soft);color:var(--primary);border:1px solid var(--primary-line);opacity:.9}.phrase-speak:active{transform:scale(.85);opacity:1}.phrase-speak.speaking{animation:speak-pulse .35s ease 2}.grid-box{position:relative;border:1px solid var(--primary-line);border-radius:12px;overflow:hidden;background:#fff}.grid-box .writer svg{display:block;touch-action:none;-webkit-user-select:none;-moz-user-select:none;user-select:none;-webkit-touch-callout:none}.grid-box .writer svg svg>path{filter:url(#hc-ink)}.grid-mi,.grid-tian{background-image:repeating-linear-gradient(90deg,rgba(79,70,229,.4) 0 5px,transparent 5px 10px),repeating-linear-gradient(180deg,rgba(79,70,229,.4) 0 5px,transparent 5px 10px);background-size:100% 1px,1px 100%}.grid-mi,.grid-mi:after,.grid-mi:before,.grid-tian{background-repeat:no-repeat;background-position:50%}.grid-mi:after,.grid-mi:before{content:"";position:absolute;inset:-50%;background-image:repeating-linear-gradient(90deg,rgba(79,70,229,.4) 0 6px,transparent 6px 14px);background-size:100% 1px;pointer-events:none}.grid-mi:before{transform:rotate(45deg)}.grid-mi:after{transform:rotate(-45deg)}.grid-none{background-image:none;border-color:rgba(100,116,139,.35)}.practice-grid{width:min(280px,100%);margin:0 auto;aspect-ratio:1/1}.practice-btns{display:flex;justify-content:center;gap:8px;margin-top:10px}.practice-btns .btn{flex:0 1 auto;padding:8px 14px;font-size:13px}.practice-btns .demo-btn{background:var(--primary-soft);color:var(--primary);border:1px solid var(--primary-line);font-weight:600}.practice-btns .demo-btn:hover{background:#e0e7ff;border-color:#a5b4fc}.practice-btns .demo-btn:active{background:#e2e6ff}.practice-btns .practice-btn{background:var(--primary);color:#fff;font-weight:600}.practice-btns .practice-btn:active,.practice-btns .practice-btn:hover{background:var(--primary-dark)}.card.no-data .char-big{opacity:.55}.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:rgba(17,24,39,.88);color:#fff;padding:10px 18px;border-radius:999px;font-size:14px;z-index:100;max-width:80vw;text-align:center;pointer-events:none}@keyframes shake{0%,to{transform:translateX(0)}25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}.card.shake{animation:shake .25s ease}#pinyinCompose{margin-top:10px}.compose-box{background:#f8f9ff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}.compose-sheet{margin-top:10px;border-top:1px dashed var(--line);padding-top:10px;max-height:55vh;overflow-y:auto}.compose-sheet-head{font-size:13px;color:var(--muted);margin-bottom:8px;display:flex;align-items:center;justify-content:space-between;gap:10px}.compose-close{background:none;border:none;color:var(--muted);font-size:14px;line-height:1;cursor:pointer;padding:2px 6px}.compose-close:hover{color:var(--text)}.compose-sheet-tip{font-size:13px;color:#b91c1c}.compose-sheet-tip.is-loading{gap:8px}.compose-sheet-loading,.compose-sheet-tip.is-loading{display:flex;align-items:center;justify-content:center;color:var(--muted)}.compose-sheet-loading{gap:10px;padding:18px 12px;font-size:13px}.loading-spinner{width:16px;height:16px;border:2px solid rgba(79,70,229,.25);border-top:2px solid var(--primary);border-radius:50%;animation:loading-spin .8s linear infinite;flex-shrink:0}@keyframes loading-spin{to{transform:rotate(1turn)}}.compose-list{display:flex;flex-direction:column;gap:6px;max-height:45vh;overflow-y:auto}.cand-row{display:flex;align-items:center;gap:12px;width:100%;padding:7px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);cursor:pointer;text-align:left}.cand-row .cand-main{font-size:22px;font-weight:600;min-width:44px;flex-shrink:0;text-align:center}.cand-row .cand-meta{display:flex;flex-direction:column;gap:1px;min-width:0}.cand-row .cand-py{font-size:12px;color:var(--muted);line-height:1.3}.cand-row .cand-en{font-size:11.5px;color:var(--muted);line-height:1.3;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cand-row.active{border-color:var(--primary);background:var(--primary-soft);font-weight:700}.cand-row.active,.cand-row.active .cand-en,.cand-row.active .cand-main,.cand-row.active .cand-py{color:var(--primary)}.cand{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:58px;min-height:60px;padding:5px 8px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);cursor:pointer}.cand .cand-main{font-size:20px;font-weight:600;line-height:1.25}.cand .cand-meta{display:flex;flex-direction:column;align-items:center;margin-top:2px;max-width:120px}.cand .cand-py{font-size:10.5px;color:var(--muted);line-height:1.2}.cand .cand-en{font-size:10px;color:var(--muted);line-height:1.25;text-align:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:120px}.cand.word{min-width:0;max-width:170px;padding:5px 10px}.cand.word .cand-main{font-size:17px;letter-spacing:1px}.cand.active{border-color:var(--primary);background:var(--primary-soft);color:var(--primary);font-weight:700}.boot-error{margin:16px;padding:12px 16px;background:#fef2f2;border:1px solid #fecaca;border-radius:10px;color:#b91c1c;font-size:14px;text-align:center}.practice-hero{padding:52px 0 8px}.practice-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--primary)}.practice-eyebrow:before{content:"";width:18px;height:2px;background:var(--primary);border-radius:2px}.practice-hero-title{margin:14px 0 10px;font-size:clamp(30px,4vw,44px);line-height:1.12;font-weight:800;letter-spacing:-.02em;color:var(--text)}.practice-hero-cn{color:var(--primary)}.practice-hero-sub{margin:0;font-size:17px;line-height:1.65;color:var(--muted);max-width:640px}.sample-chips{display:flex;flex-wrap:wrap;gap:8px;margin:2px 0 14px}.sample-chip{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:999px;padding:7px 14px;font-size:15px;line-height:1.3;cursor:pointer;font-family:inherit;-webkit-tap-highlight-color:transparent;box-shadow:0 1px 2px rgba(15,23,42,.05);transition:border-color .15s ease,background .15s ease,color .15s ease,transform .15s ease,box-shadow .15s ease}.sample-chip:hover{border-color:#a5b4fc;color:var(--primary);background:var(--primary-soft);transform:translateY(-1px);box-shadow:0 3px 8px rgba(79,70,229,.12)}.sample-chip:active{transform:translateY(0);background:#e0e7ff}.practice-guide{margin-top:0;padding:16px;font-size:14px;line-height:1.6;color:var(--text)}.practice-guide h2{margin:4px 0 8px;font-size:16px;color:var(--text)}.practice-guide h2+p{margin:0 0 6px}.guide-steps{margin:0;padding-left:20px}.guide-steps li{margin:6px 0}.guide-steps strong{color:var(--text)}.guide-link,.practice-guide p a{color:var(--primary);text-decoration:underline;text-underline-offset:2px}html[data-deeplink] [data-boot-card]{display:none}html[data-deeplink] [data-boot-skeleton]{display:block}.card-skeleton{pointer-events:none}.card-skeleton .skeleton-block,.card-skeleton .skeleton-line{border-radius:8px;background:linear-gradient(90deg,var(--line) 25%,#f4f6fa 37%,var(--line) 63%);background-size:400% 100%;animation:skeleton-shimmer 1.4s ease infinite}.card-skeleton .skeleton-block{width:96px;height:96px;flex:none}.card-skeleton .skeleton-line{height:13px;margin:7px 0}.card-skeleton .grid-box{display:flex;align-items:center;justify-content:center;aspect-ratio:1/1;max-height:60vh}@keyframes skeleton-shimmer{0%{background-position:100% 0}to{background-position:0 0}}@media (prefers-reduced-motion:reduce){.card-skeleton .skeleton-block,.card-skeleton .skeleton-line{animation:none}}