.b11{--paper:#fbf5e6;--paper-deep:#f3e6c8;--ink:#26201a;--ink-soft:#4a453d;--seal:#c23a2a;--seal-deep:#8f2418;--bamboo:#2f6b57;--bamboo-bright:#3a9a4a;--gold:#d19a3a;--rule:#e3cfa3}.b11 *{box-sizing:border-box}.b11{scroll-behavior:smooth;overflow-anchor:none;margin:0;background:var(--paper);background-image:radial-gradient(ellipse at 20% 10%,rgba(181,50,42,.05),transparent 40%),radial-gradient(ellipse at 80% 90%,rgba(75,90,60,.06),transparent 45%);color:var(--ink);font-family:Noto Sans,Noto Sans SC,sans-serif;line-height:1.6}.b11:before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.5;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");z-index:1}.b11 .wrap{max-width:960px;margin:0 auto;padding:0 24px 120px}.b11 header.hero{padding:56px 24px 48px;text-align:center;border-bottom:1px solid var(--rule);overflow:hidden}.b11 .date-tag{font-size:.75rem;letter-spacing:.18em;color:var(--ink-soft);margin-bottom:28px}.b11 .seal-box{width:88px;height:88px;margin:0 auto 22px;border:3px solid var(--seal);border-radius:6px;display:flex;align-items:center;justify-content:center;color:var(--seal);font-family:"Noto Serif SC",serif;font-weight:900;font-size:1.5rem;transform:rotate(-3deg);box-shadow:0 0 0 1px rgba(181,50,42,.15);position:relative}.b11 .seal-box:after{content:"";position:absolute;inset:6px;border:1px solid var(--seal);border-radius:3px;opacity:.5}.b11 h1.cn{font-family:"Noto Serif SC",serif;font-weight:900;font-size:clamp(1.8rem,6vw,3rem);color:var(--ink);margin:0 0 6px;letter-spacing:.02em}.b11 .pinyin-line{font-size:1rem;color:var(--seal);font-style:italic;margin-bottom:6px}.b11 .subtitle{font-size:1rem;color:var(--ink-soft)}.b11 .subtitle strong{color:var(--bamboo);font-weight:700}.b11 .brush-rule{width:140px;height:3px;margin:26px auto 0;background:linear-gradient(90deg,transparent,var(--seal) 20%,var(--seal) 80%,transparent);border-radius:2px;opacity:.8}.b11 .voice-picker{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:14px;font-size:.82rem;color:var(--ink-soft)}.b11 .voice-picker select{font-family:Noto Sans,sans-serif;font-size:.82rem;padding:5px 10px;border:1px solid var(--rule);border-radius:4px;background:var(--paper-deep);color:var(--ink);max-width:260px}.b11 .vp-status{font-weight:700}.b11 .vp-status.ok{color:var(--bamboo)}.b11 .vp-status.warn{color:var(--seal)}.b11 .back-link{display:inline-block;margin:14px 0 0 14px;font-size:.85rem;color:var(--ink-soft);text-decoration:none;border:1px solid var(--seal);border-radius:6px;padding:4px 10px}.b11 .back-link:hover{color:var(--seal);background:var(--paper-deep)}.b11 .lesson-nav{display:flex;justify-content:center;align-items:center;gap:14px;flex-wrap:wrap;padding:32px 24px 0}.b11 .prev-link{display:inline-block;font-size:.9rem;color:var(--ink-soft);text-decoration:none;border:1px solid var(--rule);border-radius:6px;padding:8px 16px;font-weight:700}.b11 .prev-link:hover{color:var(--seal-deep);border-color:var(--seal);background:var(--paper-deep)}.b11 .next-link{display:inline-block;font-size:.9rem;color:var(--seal-deep);text-decoration:none;border:1px solid var(--seal);border-radius:6px;padding:8px 16px;font-weight:700}.b11 .next-link:hover{color:var(--paper);background:var(--seal)}.b11 footer.pagefoot-note{text-align:center;padding:18px 24px 0;color:var(--ink-soft);font-size:.8rem;letter-spacing:.04em}.b11 .toc{border:1px solid var(--rule);border-radius:6px;background:var(--paper-deep);padding:18px 22px;margin:28px 0 26px}.b11 .toc-title{font-weight:700;color:var(--seal);font-size:.85rem;margin-bottom:12px}.b11 .toc-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}.b11 .toc-list a{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:var(--ink);padding:2px 0}.b11 .toc-list a:hover .toc-cn,.b11 .toc-list a:hover .toc-vn,.b11 .toc-num{color:var(--seal)}.b11 .toc-num{font-weight:700;min-width:1.8em;flex-shrink:0}.b11 .toc-cn{font-family:"Noto Serif SC",serif;font-weight:600;flex-shrink:0}.b11 .toc-vn{color:var(--ink-soft);font-size:.88rem}.b11 section{position:relative;padding:56px 0 8px;scroll-margin-top:20px}.b11 section+section{border-top:1px solid var(--rule)}.b11 .sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:30px}.b11 .q-title{text-align:center;margin:0 auto 28px}.b11 .q-title .q-cn{font-family:"Noto Serif SC",serif;font-size:clamp(1.5rem,5vw,2.1rem);font-weight:900;line-height:1.35;color:var(--ink)}.b11 .q-title .q-py{font-size:.95rem;color:var(--seal);font-style:italic;margin:2px 0}.b11 .q-title .q-vn{font-size:1rem;color:var(--ink-soft);font-style:italic}.b11 .sec-num{font-size:2.4rem;font-weight:900;color:var(--seal);line-height:1}.b11 .sec-num,.b11 .sec-title-cn{font-family:"Noto Serif SC",serif}.b11 .sec-title-cn{font-size:1.6rem;font-weight:600;color:var(--ink)}.b11 .sec-title-py{font-size:.8rem;color:var(--seal);font-style:italic;margin:1px 0 2px}.b11 .sec-title-lbl,.b11 .sec-title-vn{font-size:.95rem;color:var(--ink-soft);font-style:italic}.b11 .pin-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:28px}.b11 .pin-card{position:relative;background:#fff;border:1px solid var(--rule);border-radius:4px;padding:20px 12px 14px;text-align:center;box-shadow:0 2px 6px rgba(33,30,25,.08),0 1px 0 rgba(33,30,25,.04);transform:rotate(var(--tilt,0deg));transition:transform .15s ease,box-shadow .15s ease}.b11 .pin-card:hover{transform:rotate(0deg) translateY(-2px);box-shadow:0 8px 18px rgba(33,30,25,.12)}.b11 .pin-card:before{content:"";position:absolute;top:6px;left:50%;transform:translateX(-50%);width:11px;height:11px;border-radius:50%;background:var(--pin-color,var(--seal));box-shadow:0 1px 2px rgba(0,0,0,.35)}.b11 .pin-card .emoji{font-size:1.2rem;line-height:1;display:block;margin-top:8px}.b11 .pin-card .hz{font-family:"Noto Serif SC",serif;font-size:1.55rem;font-weight:700;color:var(--ink);display:inline-block;margin-top:2px}.b11 .pin-card .py{font-size:.8rem;color:var(--ink-soft);display:block;margin-top:4px}.b11 .pin-card .vn{font-size:.82rem;color:var(--bamboo);font-weight:600;margin-top:3px;display:block}.b11 .sentence-stack{display:flex;flex-direction:column;gap:8px;margin:0 auto}.b11 .sentence-card{background:var(--paper-deep);border:1px solid var(--rule);border-radius:10px;padding:12px 16px;text-align:center}.b11 .sentence-card.speaker-a{border-left:4px solid var(--seal);border-radius:0 10px 10px 10px}.b11 .sentence-card.speaker-b{border-left:4px solid var(--bamboo);border-radius:0 10px 10px 10px}.b11 .sentence-hz{font-family:"Noto Serif SC",serif;font-size:1.35rem;font-weight:700;color:var(--ink)}.b11 .sentence-hz .hl{color:var(--seal)}.b11 .sentence-py{font-size:.82rem;color:var(--seal);font-style:italic;margin-top:2px}.b11 .sentence-vn{font-size:.88rem;color:var(--ink-soft);margin-top:2px}.b11 .sub-head{margin-top:36px;margin-bottom:16px}.b11 .sub-head .t{font-family:"Noto Serif SC",serif;font-size:1.1rem;font-weight:700;color:var(--ink)}.b11 .sub-head .d{font-size:.82rem;color:var(--ink-soft);margin-left:10px}.b11 .hz-story{border-left:3px solid var(--bamboo);background:rgba(75,90,60,.06);border-radius:0 6px 6px 0;padding:12px 16px;margin-bottom:14px}.b11 .hz-parts{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:8px}.b11 .hz-parts .part{font-family:"Noto Serif SC",serif;font-weight:700;color:var(--bamboo);background:var(--paper-deep);border:1px solid var(--rule);border-radius:4px;padding:4px 10px;font-size:1rem}.b11 .hz-parts .part i{font-family:inherit;font-style:italic;font-weight:400;color:var(--ink-soft);font-size:.78rem;margin-left:4px}.b11 .hz-parts .plus{color:var(--seal);font-weight:900}.b11 .hz-story p{margin:0;font-size:.9rem;color:var(--ink-soft);line-height:1.65}.b11 .stroke-legend{border:1px solid var(--rule);background:var(--paper-deep);border-radius:6px;padding:12px 14px;margin-bottom:18px}.b11 .stroke-legend-title{font-weight:700;cursor:pointer}.b11 .stroke-legend[open] .stroke-legend-title{margin-bottom:10px}.b11 .char-steps{background:#fff;border:1px solid var(--rule);border-radius:4px;padding:24px 26px;margin-bottom:20px;box-shadow:0 2px 6px rgba(33,30,25,.08),0 1px 0 rgba(33,30,25,.04)}.b11 .char-steps-title{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;margin-bottom:14px;padding-bottom:14px;border-bottom:1px dashed var(--rule)}.b11 .char-steps-title .big{font-family:"Noto Serif 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.hw-quiz-status{font-size:.92rem;color:var(--bamboo);min-height:1.2em}.b11 .speakable{cursor:pointer;position:relative}.b11 .speakable:after{content:"🔊";font-size:.65rem;position:absolute;top:-6px;right:-14px;background:var(--paper);border:1px solid var(--rule);border-radius:50%;width:18px;height:18px;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .15s,transform .15s;pointer-events:none;z-index:2}.b11 .speakable:focus-visible:after,.b11 .speakable:hover:after{opacity:1;transform:scale(1.18)}.b11 .speakable.speaking:after{opacity:1;background:var(--seal);border-color:var(--seal)}.b11 .mode-picker{display:flex;gap:6px;justify-content:center;margin:10px auto 0;flex-wrap:wrap}.b11 .mode-btn{font-size:.85rem;padding:6px 14px;border:1px solid var(--rule);border-radius:999px;background:var(--paper);color:var(--ink);cursor:pointer;font-family:Noto Sans,sans-serif}.b11 .mode-btn.active{background:var(--seal);border-color:var(--seal);color:#fff;font-weight:700}.b11 .mode-picker-float{position:fixed;top:50%;right:14px;transform:translateY(-50%);z-index:50;display:flex;flex-direction:column;gap:8px;padding:10px 8px;background:var(--paper);border:1px solid var(--rule);border-radius:14px;box-shadow:0 4px 14px rgba(33,30,25,.12)}.b11 .mode-picker-float .mode-btn{writing-mode:vertical-rl;text-orientation:mixed;padding:12px 6px;font-size:.78rem;white-space:nowrap}@media (max-width:720px){.b11 .mode-picker-float{right:4px;padding:4px 3px;gap:4px;border-radius:10px}.b11 .mode-picker-float .mode-btn{padding:5px 2px;font-size:.6rem;border-radius:999px}}.b11[data-mode=hanzi] .meta,.b11[data-mode=hanzi] .pinyin-line,.b11[data-mode=hanzi] .subtitle-vn,.b11[data-mode=hanzi] [class*=py],.b11[data-mode=hanzi] [class*=vn],.b11[data-mode=pinyin] .meta,.b11[data-mode=pinyin] .subtitle-vn,.b11[data-mode=pinyin] [class*=vn]{display:none!important}.b11 #luyenViet .meta,.b11 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.poem-meta-vn{font-size:.8rem;color:var(--ink-soft);font-style:italic;margin-bottom:14px}.b11 .poem-line{padding:8px 0;cursor:pointer;border-radius:8px;transition:background .2s}.b11 .poem-line.speaking{background:rgba(181,50,42,.12)}.b11 .poem-zh{font-family:"Noto Serif SC",serif;font-size:1.5rem;letter-spacing:.12em}.b11 .poem-zh ruby rt{font-family:Noto Sans,sans-serif;font-size:.6rem;letter-spacing:0;color:var(--seal);font-style:italic}.b11 .poem-vn{font-size:.8rem;color:var(--ink-soft);font-style:italic}.b11 .book-panel{background:#f0e1d4;border-radius:6px;padding:18px 22px 10px;margin-bottom:16px}.b11 .book-line{display:flex;gap:6px;margin-bottom:14px}.b11 .book-spk{flex:0 0 3.2em;font-family:"Noto Serif SC",serif;font-size:1.2rem;text-align:right;white-space:nowrap;padding-top:.2em}.b11 .book-txt{flex:1;min-width:0}.b11 .book-zh{font-family:"Noto Serif SC",serif;font-size:1.25rem;line-height:2.7;color:var(--ink);cursor:pointer;border-radius:6px}.b11 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