.b13{--paper:#fbf6ea;--paper-deep:#f1e3c4;--ink:#22150f;--ink-soft:#5a4636;--seal:#8e2323;--seal-deep:#641616;--bamboo:#1f7f8a;--bamboo-bright:#3a9a4a;--gold:#f2a100;--rule:#e4cfa0}.b13 *{box-sizing:border-box}.b13{scroll-behavior:smooth;overflow-anchor:none;margin:0;background:var(--paper);background-image:radial-gradient(ellipse at 15% 0,rgba(255,61,113,.18),transparent 45%),radial-gradient(ellipse at 90% 100%,rgba(255,180,0,.14),transparent 50%);color:var(--ink);font-family:Plus Jakarta Sans,Noto Sans,Noto Sans SC,sans-serif;line-height:1.6}.b13:before{inset:0;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}.b13 .wrap{max-width:960px;margin:0 auto;padding:0 24px 120px}.b13 header.hero{padding:56px 24px 48px;text-align:center;border-bottom:1px solid var(--rule);overflow:hidden}.b13 .date-tag{font-size:.75rem;letter-spacing:.18em;color:var(--ink-soft);margin-bottom:28px}.b13 .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(255,61,113,.15);position:relative}.b13 .seal-box:after{content:"";position:absolute;inset:6px;border:1px solid var(--seal);border-radius:3px;opacity:.5}.b13 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}.b13 .pinyin-line{font-size:1rem;color:var(--seal);font-style:italic;margin-bottom:6px}.b13 .subtitle{font-size:1rem;color:var(--ink-soft)}.b13 .subtitle strong{color:var(--bamboo);font-weight:700}.b13 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24px 0}.b13 .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}.b13 .prev-link:hover{color:var(--seal-deep);border-color:var(--seal);background:var(--paper-deep)}.b13 .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}.b13 .next-link:hover{color:var(--paper);background:var(--seal)}.b13 footer.pagefoot-note{text-align:center;padding:18px 24px 0;color:var(--ink-soft);font-size:.8rem;letter-spacing:.04em}.b13 .toc{border:1px solid var(--rule);border-radius:6px;background:var(--paper-deep);padding:18px 22px;margin:28px 0 26px}.b13 .toc-title{font-weight:700;color:var(--seal);font-size:.85rem;margin-bottom:12px}.b13 .toc-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}.b13 .toc-list a{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:var(--ink);padding:2px 0}.b13 .toc-list a:hover .toc-cn,.b13 .toc-list a:hover .toc-vn{color:var(--seal)}.b13 .sub-head[id]{scroll-margin-top:16px}.b13 .toc-num{font-weight:700;color:var(--seal);min-width:1.8em;flex-shrink:0}.b13 .toc-cn{font-family:"Noto Serif SC",serif;font-weight:600;flex-shrink:0}.b13 .toc-vn{color:var(--ink-soft);font-size:.88rem}.b13 section{position:relative;padding:56px 0 8px;scroll-margin-top:20px}.b13 section+section{border-top:1px solid var(--rule)}.b13 .sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:30px}.b13 .sec-num{font-size:2.4rem;font-weight:900;color:var(--seal);line-height:1}.b13 .sec-num,.b13 .sec-title-cn{font-family:"Noto Serif SC",serif}.b13 .sec-title-cn{font-size:1.6rem;font-weight:600;color:var(--ink)}.b13 .sec-title-py{font-size:.8rem;color:var(--seal);font-style:italic;margin:1px 0 2px}.b13 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SC",serif;font-size:1.1rem;font-weight:700;color:var(--ink)}.b13 .sub-head .d{font-size:.82rem;color:var(--ink-soft);margin-left:10px}.b13 .hz-story{border-left:3px solid var(--bamboo);background:rgba(106,61,240,.06);border-radius:0 6px 6px 0;padding:12px 16px;margin-bottom:14px}.b13 .hz-parts{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:8px}.b13 .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}.b13 .hz-parts .part i{font-family:inherit;font-style:italic;font-weight:400;color:var(--ink-soft);font-size:.78rem;margin-left:4px}.b13 .hz-parts .plus{color:var(--seal);font-weight:900}.b13 .hz-story p{margin:0;font-size:.9rem;color:var(--ink-soft);line-height:1.65}.b13 .char-steps{background:#fff;border:1px solid var(--rule);border-radius:4px;padding:24px 26px;margin-bottom:20px;box-shadow:0 2px 6px rgba(27,19,64,.08),0 1px 0 rgba(27,19,64,.04)}.b13 .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)}.b13 .char-steps-title .big{font-family:"Noto Serif SC",serif;font-size:3rem;font-weight:700;line-height:1.1;color:var(--seal)}.b13 .char-steps-title .meta{font-size:1rem;color:var(--ink-soft)}.b13 .hw-box{display:flex;flex-direction:column;align-items:center;gap:10px}.b13 .hw-target{width:150px;height:150px;background-color:var(--paper-deep);background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px),linear-gradient(var(--rule) .5px,transparent .5px),linear-gradient(90deg,var(--rule) .5px,transparent .5px);background-size:75px 75px,75px 75px,25px 25px,25px 25px;border:2px solid var(--seal);border-radius:4px}.b13 .hw-controls-row{display:flex;gap:8px}.b13 .hw-replay{font-size:.92rem;padding:7px 16px;border:1px solid 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.chat-bubble{position:relative;max-width:78%;padding:10px 16px 11px;border-radius:20px 20px 20px 6px;background:#ffffff;border:1.5px solid var(--seal);box-shadow:0 4px 0 rgba(255,61,113,.14)}.b13 .chat-row.me .chat-bubble{border-radius:20px 20px 6px 20px;border-color:var(--bamboo-bright);background:#f1f8e9;box-shadow:0 4px 0 rgba(58,154,74,.18)}.b13 .chat-who{font-size:.68rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--seal);margin-bottom:2px}.b13 .chat-row.me .chat-who{color:var(--bamboo-bright)}.b13 .chat-hz{font-family:"Noto Serif SC",serif;font-size:1.3rem;font-weight:700;color:var(--ink);line-height:1.35}.b13 .chat-hz .hl{background:linear-gradient(transparent 58%,rgba(212,160,23,.45) 0);padding:0 2px}.b13 .chat-py{font-size:.8rem;color:var(--ink-soft);margin-top:2px}.b13 .chat-vn{font-size:.84rem;color:var(--bamboo);font-weight:600;margin-top:2px}.b13 .speakable{cursor:pointer;position:relative}.b13 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SC",serif;font-weight:900;font-size:1.15rem;box-shadow:0 0 0 3px #fffaf0,0 0 0 5px #f2a100}.b13 .fx-stack .sentence-card.speaker-a,.b13 .fx-stack .sentence-card.speaker-b{border-radius:16px}.b13 .fx-stack .sentence-hz{font-size:1.35rem;line-height:1.7}.b13 .fx-stack .sentence-py{margin-top:0}.b13 .fx-var{display:inline-block;padding:0 9px;margin:0 1px;border-radius:7px;background:rgba(31,127,138,.14);border-bottom:2px solid #1f7f8a;color:#17636c;font-weight:700;line-height:1.5}@media (max-width:560px){.b13 .fx-stack .sentence-card{padding-left:58px}.b13 .fx-stack .sentence-card:before{left:12px;width:32px;height:32px;font-size:1rem}.b13 .fx-stack .sentence-hz{font-size:1.15rem}}.b13 #baiKhoa .pin-card{cursor:pointer}.b13 #baiKhoa .pin-card:focus-visible{outline:3px solid #1f7f8a;outline-offset:2px}.b13 #baiKhoa .pin-card.speaking{box-shadow:0 0 0 3px #1f7f8a,0 8px 18px rgba(31,127,138,.3)}.b13 .wind-rows{max-width:680px;margin:0 auto;display:grid;gap:18px}.b13 .wind-row{position:relative;padding:14px 14px 18px;border-radius:18px;background:linear-gradient(180deg,rgba(255,250,240,.92),rgba(246,232,200,.92));border:1px solid #e0c58a;box-shadow:0 8px 20px rgba(100,22,22,.1);overflow:hidden}.b13 .wind-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;gap:4px 12px;margin-bottom:8px;text-align:center}.b13 .wind-pat{font-family:"Noto Serif SC",serif;font-size:1.45rem;font-weight:900;color:var(--ink)}.b13 .wind-py{font-size:.8rem;color:var(--seal);font-style:italic}.b13 .wind-vn{font-size:.8rem;color:var(--ink-soft)}.b13 .flag-line{position:relative;display:flex;flex-wrap:wrap;justify-content:center;gap:0 5px;padding-top:16px}.b13 .flag-line:before{content:"";position:absolute;left:2%;right:2%;top:8px;height:5px;border-radius:50%;border-top:2px solid #6a4a2a}.b13 .flag{--fg:#fff;--bg:#2d7fe6;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:1px;width:84px;min-height:120px;margin-bottom:8px;padding:14px 3px 26px;background:var(--bg);color:var(--fg);clip-path:polygon(0 0,100% 0,100% 100%,50% 80%,0 100%);transform-origin:50% 0;text-align:center;line-height:1.25;animation:flagSway var(--dur,3.4s) ease-in-out calc(var(--i) * -.45s) infinite}.b13 .flag:before{content:"";position:absolute;top:0;left:0;right:0;height:5px;background:rgba(0,0,0,.22)}.b13 .flag.c1{--bg:#2d7fe6;--fg:#fff}.b13 .flag.c2{--bg:#fbfbf6;--fg:#22150f}.b13 .flag.c3{--bg:#e23a30;--fg:#fff}.b13 .flag.c4{--bg:#2faa58;--fg:#fff}.b13 .flag.c5{--bg:#ffc21a;--fg:#22150f}.b13 .flag .deg-hz{font-family:"Noto Serif SC",serif;font-weight:900;font-size:1.25rem;color:inherit}.b13 .flag .deg-py{font-size:.6rem;white-space:nowrap;font-style:italic;color:inherit;opacity:.92}.b13 .flag .deg-vn{font-size:.66rem;color:inherit;opacity:.95;font-weight:600}.b13 .flag .deg-hz.speaking{text-decoration:underline}@keyframes flagSway{0%,to{transform:rotate(var(--a,-3deg)) skewX(var(--k,0deg))}50%{transform:rotate(calc(var(--a, -3deg) * -1)) skewX(calc(var(--k, 0deg) * -1))}}.b13 .w-mid .flag{--a:-3deg;--k:1deg;--dur:3.6s}.b13 .w-high .flag{--a:-6deg;--k:3deg;--dur:1.3s}.b13 .w-high .flag-line{gap:0 7px}.b13 .w-high .flag{filter:saturate(1.15)}.b13 .w-none .flag{animation:none;filter:grayscale(.85) brightness(.95);opacity:.78}.b13 .w-none .flag:after{content:"✕";position:absolute;right:6px;top:8px;font-size:.7rem;font-weight:900;color:#8e2323}.b13.wind-off .flag{animation-play-state:paused}@media (prefers-reduced-motion:reduce){.b13 .flag{animation:none}}@media (max-width:560px){.b13 .flag{width:78px;min-height:108px}.b13 .flag .deg-hz{font-size:1.1rem}}.b13 .dish-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.b13 .dish{--c:#8e2323;--bg:#fdecec;display:flex;align-items:center;gap:12px;padding:12px 14px;background:#fffaf0;border:1px solid #e6d3a6;border-radius:16px;position:relative;overflow:hidden;box-shadow:0 4px 0 rgba(0,0,0,.05)}.b13 .dish:before{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:var(--c)}.b13 .dish-ico{flex:none;width:52px;height:52px;border-radius:50%;display:grid;place-items:center;font-size:1.7rem;background:var(--bg);box-shadow:0 0 0 3px #fff,0 0 0 5px var(--c);margin-left:6px}.b13 .dish-txt{min-width:0;text-align:left}.b13 .dish .sentence-hz{font-size:1.15rem;line-height:1.5}.b13 .dish .sentence-py{font-size:.76rem;margin-top:0}.b13 .dish .sentence-vn{font-size:.8rem;margin-top:1px}.b13 .dish-t{display:inline-block;padding:0 8px;margin:0 2px;border-radius:999px;background:var(--bg);color:var(--c);box-shadow:inset 0 0 0 1.5px var(--c);font-weight:900}.b13 .t-la{--c:#c62828;--bg:#fde6e4}.b13 .t-xiang{--c:#b7791f;--bg:#fdf1d3}.b13 .t-tian{--c:#c2417c;--bg:#fde6f0}.b13 .t-dan{--c:#1f6fb8;--bg:#e3f0fb}.b13 .t-you{--c:#7a4a22;--bg:#f3e6d8}.b13 .t-suan{--c:#3d8b2f;--bg:#e6f4de}.b13 .qa-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.b13 .qa-card{background:#fffaf0;border:1px solid #e6d3a6;border-radius:16px;padding:10px 12px;display:grid;gap:8px;box-shadow:0 4px 0 rgba(0,0,0,.05)}.b13 .qa-card.qa-solo{grid-column:1/-1;border-style:dashed}.b13 .qa-line{display:flex;gap:10px;align-items:flex-start;text-align:left}.b13 .qa-a{border-top:1px dashed #e6d3a6;padding-top:8px}.b13 .qa-badge{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-family:"Noto Serif SC",serif;font-weight:900;color:#fff;background:#8e2323;margin-top:2px}.b13 .qa-a .qa-badge{background:#2faa58}.b13 .qa-badge.qa-ab{font-family:inherit;font-size:.95rem;cursor:default}.b13 .qa-txt{min-width:0}.b13 .qa-line .sentence-hz{font-size:1.1rem;line-height:1.5}.b13 .qa-line .sentence-py{font-size:.74rem;margin-top:0}.b13 .qa-line .sentence-vn{font-size:.78rem;margin-top:1px}.b13 .qa-line .hl{background:linear-gradient(transparent 58%,rgba(212,160,23,.45) 0);padding:0 2px;color:inherit}.b13 .qa-hint{font-size:.78rem;color:var(--ink-soft);font-style:italic;text-align:center}.b13 .dish,.b13 .qa-badge:not(.qa-ab),.b13 .qa-line{cursor:pointer}.b13 .dish.speaking,.b13 .qa-line.speaking{box-shadow:0 0 0 3px #1f7f8a,0 6px 14px rgba(31,127,138,.25);border-radius:14px}.b13 .qa-line.speaking{padding:4px 6px;margin:-4px -6px;background:rgba(31,127,138,.08)}.b13 .qa-badge.speaking{box-shadow:0 0 0 3px #1f7f8a}.b13 .dish:focus-visible,.b13 .qa-badge:focus-visible,.b13 .qa-line:focus-visible{outline:3px solid #1f7f8a;outline-offset:2px}@media (max-width:640px){.b13 .dish-grid,.b13 .qa-grid{grid-template-columns:1fr}}.b13 .tk-modes{display:flex;justify-content:center;gap:8px;margin-bottom:12px}.b13 .tk-mode{font:inherit;font-size:.85rem;font-weight:800;padding:6px 16px;border-radius:999px;border:1.5px solid #8e2323;background:#fffaf0;color:#8e2323;cursor:pointer}.b13 .tk-mode.on{background:#8e2323;color:#fff0d0}.b13 .tk-opts{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}.b13 .tk-actions[hidden],.b13 .tk-fb[hidden],.b13 .tk-opts[hidden]{display:none}.b13 .tk-opt{font:inherit;font-weight:800;font-size:1rem;padding:10px 8px;border-radius:12px;border:2px solid #d9960b;background:#fffaf0;color:#3a2418;cursor:pointer;transition:transform .12s,background .15s}.b13 .tk-opt.hz{font-family:"Noto Serif SC",serif;font-size:1.6rem;line-height:1.1}.b13 .tk-opt:hover:not(:disabled){transform:translateY(-2px);background:#fff0c8}.b13 .tk-opt:disabled{cursor:default}.b13 .tk-opt.right{background:#2faa58;border-color:#1d7a3d;color:#fff}.b13 .tk-opt.wrong{background:#e23a30;border-color:#a02018;color:#fff}.b13 .tk-fb{margin-top:10px;text-align:center;font-weight:800;font-size:.95rem;color:var(--ink)}.b13 .tk-fb.ok{color:#1d7a3d}.b13 .tk-fb.bad{color:#a02018}.b13 .tk-card.tk-quiz{cursor:default}.b13 .tk-card.tk-quiz .tk-tap{display:none}.b13 .tk-card.tk-quiz.q-hz:not(.revealed) .tk-back .tk-py,.b13 .tk-card.tk-quiz.q-hz:not(.revealed) .tk-back .tk-vn{visibility:hidden}.b13 .sh-hz{font-family:"Noto Serif SC",serif;font-weight:700;color:var(--seal-deep);border-bottom:1px dotted var(--seal)}.b13 .sh-hz.speakable,.b13 .sub-head .t.speakable{cursor:pointer}.b13 .sh-hz.speakable:hover,.b13 .sub-head .t.speakable:hover{color:var(--seal)}.b13 .sh-hz.speakable:after,.b13 .sub-head .t.speakable:after{display:none}.b13 .sh-hz.speaking,.b13 .sub-head .t.speaking{color:#1f7f8a}.b13 .qa-grid.qa-tpl{max-width:680px;margin:0 auto}.b13 .qa-blank{display:inline-block;min-width:3.2em;margin:0 3px;border-bottom:3px dashed #1f7f8a;background:rgba(31,127,138,.1);border-radius:6px 6px 0 0;color:transparent;line-height:1.2;vertical-align:-2px}.b13 .qa-blank-s{display:inline-block;min-width:1.6em;margin:0 2px;border-bottom:2px dashed #1f7f8a;text-align:center;color:#1f7f8a;font-style:normal;font-weight:800}.b13 .gram-note{position:relative;max-width:680px;margin:18px auto 0;padding:16px 18px 16px 84px;border-radius:20px;border:1px solid #e0c58a;background:linear-gradient(135deg,#fffaf0,#fdf0d2 55%,#e6f3ee);box-shadow:0 4px 0 rgba(142,35,35,.12),0 10px 22px rgba(100,22,22,.08);overflow:hidden}.b13 .gram-note:after{content:"的";right:10px;bottom:-22px;font-size:6.5rem;line-height:1;color:rgba(142,35,35,.07);pointer-events:none}.b13 .gn-badge,.b13 .gram-note:after{position:absolute;font-family:"Noto Serif SC",serif;font-weight:900}.b13 .gn-badge{left:18px;top:50%;transform:translateY(-50%);width:50px;height:50px;border-radius:12px;display:grid;place-items:center;font-size:1.9rem;color:#fff0d0;background:radial-gradient(circle at 35% 30%,#b83131,#8e2323);box-shadow:0 0 0 3px #fffaf0,0 0 0 5px #f2a100;transform:translateY(-50%) rotate(-4deg)}.b13 .gn-title{font-weight:800;color:var(--seal-deep);font-size:1rem;margin-bottom:4px}.b13 .gram-note p{margin:0;font-size:.9rem;color:var(--ink-soft);line-height:1.65;position:relative;z-index:1}.b13 .gram-note b{color:var(--ink)}.b13 .gn-chip{display:inline-block;margin:0 3px;padding:0 9px;border-radius:999px;background:#fffaf0;border:1.5px solid #1f7f8a;color:#17636c;font-weight:700}.b13 .gn-chip,.b13 .in-hz{font-family:"Noto Serif SC",serif}.b13 .in-hz{font-weight:800;color:var(--seal-deep);border-bottom:1px dotted var(--seal)}.b13 .in-hz.speakable{cursor:pointer}.b13 .in-hz.speakable:after{display:none}.b13 .in-hz.speaking{color:#1f7f8a}.b13 .gn-badge.speakable,.b13 .gn-formula.speakable,.b13 .wind-pat.speakable{cursor:pointer}.b13 .gn-badge.speakable:after,.b13 .gn-formula.speakable:after,.b13 .wind-pat.speakable:after{display:none}.b13 .wind-pat.speaking{color:#1f7f8a}.b13 .gn-formula.speaking{background:#1f7f8a}.b13 .gn-badge.speaking{filter:brightness(1.2)}.b13 .gn-chip.speakable{cursor:pointer;transition:background .15s,transform .1s}.b13 .gn-chip.speakable:hover{background:#e3f3f1}.b13 .gn-chip.speakable:active{transform:scale(.94)}.b13 .gn-chip.speakable:after{display:none}.b13 .gn-chip.speaking{background:#1f7f8a;color:#fff}.b13 .gn-formula{display:inline-block;padding:0 10px;border-radius:8px;background:#8e2323;color:#fff0d0;font-family:"Noto Serif SC",serif;font-weight:800}.b13 .omit-grid{max-width:680px;margin:12px auto 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}.b13 .omit-card{background:#fffaf0;border:1px solid #e6d3a6;border-radius:16px;padding:10px 12px 12px;box-shadow:0 4px 0 rgba(0,0,0,.05);display:grid;gap:4px}.b13 .om-row{display:flex;gap:10px;align-items:flex-start;text-align:left}.b13 .om-tag{flex:none;margin-top:3px;min-width:34px;text-align:center;font-size:.66rem;font-weight:900;letter-spacing:.04em;padding:2px 6px;border-radius:6px;color:#fff;background:#8a8a8a}.b13 .om-short .om-tag{background:#1f7f8a}.b13 .om-body{min-width:0}.b13 .om-row .sentence-hz{font-size:1.12rem;line-height:1.5}.b13 .om-row .sentence-py{font-size:.72rem;margin-top:0}.b13 .om-row .sentence-vn{font-size:.76rem;margin-top:1px}.b13 .om-noun{color:#b3261e;text-decoration:line-through;text-decoration-thickness:2px;text-decoration-color:rgba(179,38,30,.7);font-weight:900}.b13 .om-short .sentence-hz{color:var(--ink)}.b13 .om-arrow{text-align:center;position:relative;margin:2px 0}.b13 .om-arrow:before{content:"";position:absolute;left:0;right:0;top:50%;border-top:1px dashed #d8b86a}.b13 .om-arrow span{position:relative;display:inline-block;padding:0 10px;background:#fffaf0;font-size:.7rem;font-weight:800;color:#8e2323}@media (max-width:560px){.b13 .gram-note{padding-left:76px}.b13 .gn-badge{left:14px;width:46px;height:46px}}.b13 .pp-ava{display:block;width:84px;height:108px;object-fit:cover;margin:0 auto 6px;border-radius:50%/46%;border:3px solid #fff;box-shadow:0 0 0 3px #d9960b,0 4px 10px rgba(60,10,10,.2)}.b13 .ex-img.pp-img{width:112px;height:92px;object-fit:cover}.b13 .pp-card{--ac:#e0457b;--bg1:#fff3f5;--bg2:#ffd6e0;position:relative;overflow:hidden;border:2px solid var(--ac)!important;border-radius:24px!important;background:linear-gradient(160deg,var(--bg1) 0,var(--bg2) 100%)!important;box-shadow:0 6px 0 color-mix(in srgb,var(--ac) 35%,transparent),0 14px 26px rgba(60,10,10,.12);padding:16px 16px 18px}.b13 .pp-card.pp-a{--ac:#e0457b;--bg1:#fff4f6;--bg2:#ffd3df}.b13 .pp-card.pp-b{--ac:#1f9d8a;--bg1:#effbf8;--bg2:#bfeee2}.b13 .pp-card.pp-c{--ac:#e08a00;--bg1:#fffaeb;--bg2:#ffe08a}.b13 .pp-card:before{width:170px;height:170px;right:-50px;top:-60px;background:radial-gradient(circle,color-mix(in srgb,var(--ac) 40%,transparent),transparent 70%)}.b13 .pp-card:after,.b13 .pp-card:before{content:"";position:absolute;border-radius:50%;pointer-events:none}.b13 .pp-card:after{width:130px;height:130px;left:-40px;bottom:-50px;background:radial-gradient(circle,color-mix(in srgb,var(--ac) 28%,transparent),transparent 70%)}.b13 .pp-card>*{position:relative;z-index:1}.b13 .pp-card .pp-ava{box-shadow:0 0 0 3px var(--ac),0 6px 14px color-mix(in srgb,var(--ac) 40%,transparent)}.b13 .pp-card .sentence-hz{color:var(--ac);font-size:1.6rem;filter:brightness(.82)}.b13 .pp-card .sentence-py{color:color-mix(in srgb,var(--ac) 70%,#3a2418)}.b13 .pp-card .deg-row{margin-top:10px;padding:10px 8px 8px;border-top:0;border-radius:16px}.b13 .pp-like{background:rgba(255,255,255,.7);box-shadow:inset 0 0 0 2px #2faa58}.b13 .pp-dislike{background:rgba(255,255,255,.5);box-shadow:inset 0 0 0 2px #e23a30}.b13 .pp-like>.deg-item:first-child .deg-hz{color:#1d7a3d}.b13 .pp-dislike>.deg-item:first-child .deg-hz{color:#b3261e}.b13 .pp-like>.deg-item:first-child .deg-hz:before{content:"♥ "}.b13 .pp-dislike>.deg-item:first-child .deg-hz:before{content:"✕ "}.b13 .pp-like .ex-img{border:3px solid #2faa58;border-radius:12px}.b13 .pp-dislike .ex-img{border:3px dashed #e23a30;border-radius:12px;filter:saturate(.55) brightness(.97)}.b13 .pp-more{display:grid;grid-template-rows:0fr;transition:grid-template-rows .4s ease}.b13 .pp-more-in{min-height:0;overflow:hidden}.b13 .pp-card.open .pp-more{grid-template-rows:1fr}.b13 .pp-card{cursor:pointer}.b13 .pp-card .pp-more{cursor:default}.b13 .pp-toggle{display:block;margin:6px auto 0;width:38px;height:26px;border:0;background:none;cursor:pointer;border-radius:999px;position:relative}.b13 .pp-toggle:before{content:"";position:absolute;left:50%;top:5px;width:10px;height:10px;margin-left:-6px;border-right:3px solid var(--ac);border-bottom:3px solid var(--ac);transform:rotate(45deg);transition:transform .3s ease,top .3s ease}.b13 .pp-card.open .pp-toggle:before{transform:rotate(-135deg);top:10px}.b13 .pp-toggle:hover:before{filter:brightness(.8)}.b13 .pp-toggle:focus-visible{outline:3px solid var(--ac);outline-offset:2px}@media (prefers-reduced-motion:reduce){.b13 .pp-more,.b13 .pp-toggle:before{transition:none}}.b13 .vc-bar{max-width:760px;margin:0 auto 14px;display:flex;flex-direction:column;gap:10px;align-items:center}.b13 .vc-chips{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}.b13 .vc-chip,.b13 .vc-hide{font:inherit;font-size:.8rem;font-weight:800;padding:6px 12px;border-radius:999px;border:1.5px solid #8e2323;background:#fffaf0;color:#8e2323;cursor:pointer}.b13 .vc-chip b{font-weight:800;opacity:.7;margin-left:2px}.b13 .vc-chip.on{background:#8e2323;color:#fff0d0}.b13 .vc-hide{border-color:#1f7f8a;color:#1f7f8a}.b13 .vc-hide[aria-pressed=true]{background:#1f7f8a;color:#fff}.b13 .vc-grid{max-width:760px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:10px}.b13 .vc{--c:#8e2323;--bg:#fff3f1;position:relative;display:flex;flex-direction:column;align-items:center;gap:1px;padding:12px 8px 10px;border-radius:16px;background:linear-gradient(180deg,#fffdf8,var(--bg));border:2px solid var(--c);box-shadow:0 4px 0 color-mix(in srgb,var(--c) 30%,transparent);text-align:center;cursor:pointer;transition:transform .12s}.b13 .vc:hover{transform:translateY(-2px)}.b13 .vc:before{content:"";position:absolute;top:0;left:18%;right:18%;height:5px;border-radius:0 0 6px 6px;background:var(--c)}.b13 .vc-hz{font-family:"Noto Serif SC",serif;font-weight:900;font-size:1.45rem;line-height:1.25;color:var(--c);filter:brightness(.85);word-break:keep-all}.b13 .vc-py{font-size:.72rem;font-style:italic;color:var(--ink-soft)}.b13 .vc-vn{font-size:.78rem;font-weight:700;color:var(--ink);line-height:1.3}.b13 .vc.speaking{box-shadow:0 0 0 3px #1f7f8a,0 6px 14px rgba(31,127,138,.3)}.b13 .vc.vc-hidden-g{display:none}.b13 .vc-grid.hide-mean .vc:not(.shown) .vc-py,.b13 .vc-grid.hide-mean .vc:not(.shown) .vc-vn{visibility:hidden}.b13 .vc-vi{--c:#d9441f;--bg:#ffe9e2}.b13 .vc-mon{--c:#c2417c;--bg:#fde6f0}.b13 .vc-qua{--c:#3d8b2f;--bg:#e6f4de}.b13 .vc-dong{--c:#1f6fb8;--bg:#e3f0fb}.b13 .vc-vat{--c:#7a4a9e;--bg:#f0e6f8}.b13 .vc-tinh{--c:#d99100;--bg:#fff1cc}.b13 .vc-dt{--c:#1f9d8a;--bg:#dff6f0}.b13 .vc-tg{--c:#6a5a3a;--bg:#f1e8d4}@media (max-width:480px){.b13 .vc-grid{grid-template-columns:repeat(auto-fill,minmax(104px,1fr))}.b13 .vc-hz{font-size:1.2rem}}.b13 .vt-tabs{display:flex;justify-content:center;gap:8px;margin:0 auto 16px}.b13 .vt-tab{font:inherit;font-size:.95rem;font-weight:800;padding:9px 22px;border-radius:999px;border:2px solid #8e2323;background:#fffaf0;color:#8e2323;cursor:pointer;transition:transform .12s}.b13 .vt-tab:hover{transform:translateY(-1px)}.b13 .vt-tab.on{background:linear-gradient(180deg,#b83131,#8e2323);color:#fff0d0;box-shadow:0 4px 0 rgba(100,22,22,.3)}.b13 .vt-panel[hidden]{display:none}.b13 .g13{max-width:700px;margin:0 auto}.b13 .g13-hub{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}.b13 .g13-pick{font:inherit;text-align:center;padding:16px 12px 14px;border-radius:20px;border:2px solid var(--c,#8e2323);background:linear-gradient(180deg,#fffdf8,var(--bg,#fff3f1));box-shadow:0 5px 0 color-mix(in srgb,var(--c,#8e2323) 35%,transparent);cursor:pointer;color:var(--ink);transition:transform .12s}.b13 .g13-pick:hover{transform:translateY(-3px)}.b13 .g13-pick .gi{display:block;font-size:2.2rem;line-height:1.2}.b13 .g13-pick b{display:block;font-size:1.05rem;margin:4px 0 2px;color:var(--c,#8e2323)}.b13 .g13-pick small{display:block;font-size:.78rem;color:var(--ink-soft)}.b13 .g13-pick .best{display:block;margin-top:6px;font-size:.74rem;font-weight:800;color:#b7791f}.b13 .g13-top{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px;flex-wrap:wrap}.b13 .g13-back,.b13 .g13-btn{font:inherit;font-size:.85rem;font-weight:800;padding:7px 14px;border-radius:999px;border:1.5px solid #8e2323;background:#fffaf0;color:#8e2323;cursor:pointer}.b13 .g13-btn.go{background:#1f7f8a;border-color:#1f7f8a;color:#fff}.b13 .g13-stats{display:flex;gap:12px;font-weight:800;font-size:.9rem;color:var(--ink-soft);align-items:center}.b13 .g13-hearts{letter-spacing:2px}.b13 .g13-bar{height:8px;border-radius:6px;background:#e6d3a6;overflow:hidden;margin-bottom:12px}.b13 .g13-bar i{display:block;height:100%;width:100%;background:linear-gradient(90deg,#2faa58,#ffc21a,#e23a30);transform-origin:left}.b13 .g13-q{text-align:center;padding:22px 14px;border-radius:22px;border:2px solid #d9960b;background:radial-gradient(circle at 50% 0,#fffaf0,#f6e8c8);box-shadow:0 6px 0 rgba(142,35,35,.15);margin-bottom:12px}.b13 .g13-q .q-hz{font-family:"Noto Serif SC",serif;font-weight:900;font-size:2.6rem;line-height:1.2;color:#8e2323}.b13 .g13-q .q-vn{font-size:1.5rem;font-weight:800;color:#17636c}.b13 .g13-q .q-note{font-size:.78rem;color:var(--ink-soft);margin-top:4px}.b13 .g13-q .q-listen{font-size:3rem}.b13 .g13-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}.b13 .g13-opt{font:inherit;font-weight:800;font-size:1rem;padding:14px 8px;border-radius:14px;border:2px solid #d9960b;background:#fffaf0;color:#3a2418;cursor:pointer;transition:transform .12s,background .15s}.b13 .g13-opt.hz{font-family:"Noto Serif SC",serif;font-size:1.6rem}.b13 .g13-opt:hover:not(:disabled){transform:translateY(-2px);background:#fff0c8}.b13 .g13-opt.right{background:#2faa58;border-color:#1d7a3d;color:#fff}.b13 .g13-opt.wrong{background:#e23a30;border-color:#a02018;color:#fff}.b13 .g13-opt:disabled{cursor:default}.b13 .g13-mem{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.b13 .g13-tile{position:relative;aspect-ratio:1/1;border:0;padding:0;background:none;cursor:pointer;perspective:600px}.b13 .g13-tile .in{position:absolute;inset:0;transform-style:preserve-3d;transition:transform .4s}.b13 .g13-tile.ok .in,.b13 .g13-tile.up .in{transform:rotateY(180deg)}.b13 .g13-tile .b,.b13 .g13-tile .f{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4px;text-align:center}.b13 .g13-tile .f{background:radial-gradient(circle at 50% 40%,#b83131,#641616);border:3px double #d9960b;font-size:1.8rem;color:#ffd45e}.b13 .g13-tile .b{transform:rotateY(180deg);background:#fffaf0;border:2px solid #1f7f8a;color:#3a2418;font-weight:800;font-size:.82rem;line-height:1.2}.b13 .g13-tile .b .th{font-family:"Noto Serif SC",serif;font-size:1.5rem;color:#8e2323;line-height:1.1}.b13 .g13-tile.ok .b{background:#e6f6ec;border-color:#2faa58}.b13 .g13-end{text-align:center;padding:22px 14px;border-radius:22px;border:2px dashed #1f7f8a;background:rgba(255,250,240,.85)}.b13 .g13-end .big{font-size:2.4rem}.b13 .g13-end h4{margin:4px 0;color:#8e2323;font-size:1.2rem}.b13 .g13-end p{margin:4px 0 12px;color:var(--ink-soft);font-size:.92rem}.b13 .g13-end .row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.b13 .g13-fb{text-align:center;font-weight:800;min-height:1.5em;margin-top:10px}.b13 .g13-fb.ok{color:#1d7a3d}.b13 .g13-fb.bad{color:#a02018}@media (max-width:560px){.b13 .g13-mem{grid-template-columns:repeat(3,1fr)}.b13 .g13-q .q-hz{font-size:2.1rem}}.b13 .site-foot{margin-top:150px}.b13 .site-foot svg.sc-foot{position:absolute;left:0;right:0;bottom:100%;width:100%;height:150px;pointer-events:none}.b13 .site-foot .foot-motif,.b13 .site-foot .lesson-nav{position:relative;z-index:1}.b13 .foot-motif{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 22px}.b13 .foot-item{display:flex;flex-direction:column;align-items:center;line-height:1.25}.b13 .foot-item .foot-py,.b13 .foot-item .foot-vn{font-family:inherit;font-weight:600;font-size:.7rem;letter-spacing:.03em;color:#fff;text-shadow:0 1px 3px rgba(0,0,0,.8)}@media (max-width:760px){.b13 .site-foot svg.sc-foot{height:90px}.b13 .foot-motif{gap:6px 14px}}.b13{position:relative}.b13-top{display:flex;justify-content:space-between;align-items:center;padding:14px 14px 0;position:absolute;top:0;left:0;right:0;z-index:3}