:root{color-scheme:light;--ink:#172f43;--blue:#0b4c73;--muted:#566b7a;--line:#d9e3eb;--snow:#f3f7fa;--accent:#c9f52c;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px}*{box-sizing:border-box}body{margin:0;background:#fff;color:var(--ink);line-height:1.85}a{color:var(--blue)}.skip-link{position:absolute;left:16px;top:-100px;padding:10px;background:white;z-index:2}.skip-link:focus{top:12px}.masthead{border-bottom:1px solid var(--line);padding:20px 32px;max-width:1200px;margin:auto}.brand{display:flex;align-items:center;font-size:1.5rem;letter-spacing:-.06em;font-weight:850;color:#103f5c;line-height:1.3}.brand-home>span{font-weight:550}.brand-rule{height:24px;width:1px;background:#cbd6dc;margin:0 20px}.brand .brand-label{font-size:.875rem;font-weight:500;letter-spacing:.08em;color:var(--muted)}main{max-width:1200px;margin:auto}.hero{display:grid;grid-template-columns:42% 58%;align-items:center;padding:32px;gap:0;background:linear-gradient(120deg,#eef6fb,#fff 68%)}.hero-copy{padding:12px 24px 12px 0}.eyebrow{font-size:.875rem;font-weight:700;letter-spacing:.18em;color:#38617c;margin:0 0 14px}h1{font-size:clamp(1.85rem,3.4vw,2.6rem);line-height:1.4;letter-spacing:-.035em;margin:0;font-weight:750}.title-line{height:4px;width:58px;background:var(--accent);margin-top:26px}.cover{display:block;width:100%;height:auto;border-radius:3px}.reading{max-width:980px;margin:0 auto;padding:0 30px}.intro{padding:28px 0 26px;font-size:1rem}.intro>p:nth-child(2){border-left:3px solid var(--blue);padding:12px 18px;background:#f0f6fa;font-weight:650}.intro>p:last-child{color:var(--muted);font-size:.875rem;margin-bottom:0}p{margin:.75em 0}details{border:1px solid var(--line);margin:0 0 14px;border-radius:5px;overflow:hidden;background:white}summary{list-style:none;display:flex;gap:16px;align-items:center;padding:22px 24px;cursor:pointer;background:#f3f7fa;user-select:none}summary::-webkit-details-marker{display:none}summary:hover{background:#eaf2f8}summary:focus-visible,.table-wrap:focus-visible{outline:3px solid #1397ca;outline-offset:-3px}details[open] summary{background:#0b4c73;color:#fff}h2{font-size:1.1rem;line-height:1.65;margin:0;font-weight:650;flex:1}.section-number{font-size:.875rem;letter-spacing:.06em;font-weight:600;color:#7690a4;font-variant-numeric:tabular-nums}details[open] .section-number{color:#bedde9}.plus{position:relative;flex:0 0 18px;height:18px}.plus:before,.plus:after{content:"";display:block;position:absolute;background:currentColor;top:8px;left:2px;width:14px;height:2px}.plus:after{transform:rotate(90deg)}details[open] .plus:after{transform:rotate(0)}.section-body{padding:20px 30px 30px}.section-body>p:first-child{margin-top:0}h3{font-size:1.15rem;margin:15px 0 12px;color:var(--blue)}h4{font-size:1rem;margin:0 0 14px;color:var(--blue)}strong{font-weight:650}.inset{margin:28px 0;padding:22px;background:#f5f8fb;border-left:3px solid #8eafc8;border-radius:0 4px 4px 0}.inset p:last-child{margin-bottom:0}.table-wrap{overflow-x:auto;margin:17px 0 24px;overscroll-behavior-x:contain;border:1px solid var(--line);border-radius:3px}table{width:100%;border-collapse:collapse;text-align:left;font-size:1rem;line-height:1.7}th,td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}thead th{background:#eaf2f7;color:#184665;font-size:.9rem;font-weight:650}tbody th{font-weight:400}tr:last-child th,tr:last-child td{border-bottom:0}tbody tr:nth-child(even){background:#f8fafc}.prices th:first-child{width:44%}.prices td{white-space:nowrap;font-variant-numeric:tabular-nums;font-weight:600;color:var(--blue)}.prices th:not(:first-child),.prices td{text-align:right}.examples table{min-width:710px}.examples td{white-space:nowrap}.examples th:first-child{min-width:225px}.examples td strong{color:var(--blue)}.note{color:var(--muted);border-left:3px solid #b8cad6;padding-left:16px;margin:22px 0 0}.formula{padding:10px 20px;margin:0 0 22px;background:#eef5fa;border-left:3px solid var(--blue)}ul{padding-left:1.5em}li{margin:10px 0}.section-body>p:has(>strong:only-child){color:var(--blue)}footer{padding:35px 0 42px;border-top:1px solid var(--line);margin-top:35px;display:flex;justify-content:space-between;align-items:center;color:var(--muted);gap:16px;font-size:.8rem;letter-spacing:.08em}footer strong{font-size:1.1rem;letter-spacing:-.04em;color:var(--blue)}
@media(max-width:760px){.masthead{padding:18px 20px}.hero{display:flex;flex-direction:column;padding:25px 20px 20px;align-items:stretch;gap:20px}.hero-copy{padding:0}h1{font-size:1.85rem}.eyebrow{display:none}.title-line{margin-top:17px}.reading{padding:0 16px}.intro{padding:14px 4px 24px}summary{padding:18px 16px;gap:12px}h2{font-size:1rem}.section-number{display:none}.section-body{padding:18px 16px 24px}.inset{padding:17px 14px;margin:22px 0}table{font-size:1rem}th,td{padding:12px 10px}thead th{font-size:.875rem}.prices table{min-width:480px}.inset table{min-width:430px}.table-wrap{margin-bottom:18px}.formula{padding:8px 14px}.cover{border-radius:3px}footer{font-size:.75rem;letter-spacing:.02em}}@media(prefers-reduced-motion:no-preference){summary{transition:background-color .15s}}@media print{.masthead,.skip-link{display:none}.hero{padding:0;grid-template-columns:55% 45%;background:none}.reading{max-width:none;padding:0}.section-body{display:block!important}details::details-content{content-visibility:visible!important;display:block!important}summary{break-after:avoid;background:#edf3f7!important;color:#172f43!important}.plus{display:none}details{break-inside:auto}.table-wrap{overflow:visible}table{min-width:0!important;font-size:10pt}th,td{padding:8px}.inset,.formula{break-inside:avoid}footer{margin:12px 0;padding:12px 0}}

/* Language switch shares the original masthead and responsive layout. */
.masthead{display:flex;align-items:center;justify-content:space-between;gap:18px}html[lang="en"] h1{font-size:clamp(1.8rem,3.2vw,2.5rem);letter-spacing:-.035em;line-height:1.25}html[lang="en"] h2{line-height:1.55}html[lang="en"] .prices th:first-child{width:46%}html[lang="en"] .examples th:first-child{min-width:245px}@media(max-width:520px){.masthead{gap:12px}.brand .brand-label,.brand-rule{display:none}html[lang="en"] .prices table{min-width:540px}}@media print{}

.language-selector{display:inline-flex;align-items:center;gap:4px;padding:4px;border:1px solid #d8e4ee;border-radius:8px;background:#fff;flex-shrink:0;line-height:1.4}.language-selector button{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 14px;border-radius:5px;color:#345f7e;text-decoration:none;font-size:1rem;font-weight:500;white-space:nowrap}.language-selector button:hover{background:#edf4f8}.language-selector button[aria-pressed="true"]{background:#173f5f;color:#fff}.language-selector button:focus-visible{outline:3px solid #78b6df;outline-offset:3px}@media print{.language-selector{display:none}}

.language-selector button{font-family:inherit;border:0;cursor:pointer;background:transparent}

/* Keep the three language choices in their approved order at every width. */
@media(max-width:650px){.masthead{flex-wrap:wrap;gap:12px}.language-selector{width:100%;max-width:360px;margin-left:auto;justify-content:space-between}.language-selector button{flex:1;padding:8px 10px;font-size:.875rem}.brand .brand-label{font-size:.8rem}}

/* Brand link leads to the TXSNOW homepage, with clear hover and keyboard states. */
.brand-home{display:inline-flex;align-items:center;min-height:44px;padding:6px 8px;margin:-6px -8px;border-radius:6px;color:inherit;text-decoration:none;white-space:nowrap;cursor:pointer}
.brand-home:hover,.brand-home:focus-visible{color:#0866b5;background:#eaf4ff;text-decoration:underline;text-underline-offset:.18em;text-decoration-thickness:1.5px}
.brand-home:focus-visible{outline:3px solid #78b6df;outline-offset:3px}
@media(prefers-reduced-motion:no-preference){.brand-home{transition:color .15s,background-color .15s}}

/* Long-form teaching guide: retain the approved TXSNOW design. */
:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","PingFang TC","Microsoft YaHei","Microsoft JhengHei",sans-serif}
.hero{grid-template-columns:62% 38%;padding:30px 40px;min-height:340px}.hero-copy{padding:12px 30px 12px 0}.hero .cover{width:100%;max-width:300px;max-height:320px;object-fit:contain;justify-self:center}.hero h1 span{font-weight:500;font-size:.8em}.version{font-size:.875rem;color:var(--muted);margin:20px 0 0;letter-spacing:.1em}.intro>p:last-child,.intro>p{color:var(--ink);font-size:1rem}.age-bands{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}.age-bands span{padding:7px 12px;border:1px solid #d9e7ee;border-radius:4px;background:#f4f8fb;font-size:.875rem;line-height:1.5;color:#255578}.section-body>h3:first-child{margin-top:0}.section-body h3{margin-top:28px}.teaching-table{overflow:visible}.teaching-table table{table-layout:fixed}.teaching-table thead th:first-child{width:20%}.teaching-table thead th:nth-child(2){width:36%}.teaching-table tbody th{font-weight:650;color:var(--blue)}.teaching-table p{margin:0}.teaching-table th,.teaching-table td{overflow-wrap:break-word;padding:17px 16px}.teaching-table tr{break-inside:avoid}blockquote{margin:22px 0;padding:16px 22px;border-left:3px solid #8eafc8;background:#eef5fa;color:#244b68}blockquote p{margin:0}figure{margin:28px 0}figure img{max-width:100%;height:auto;display:block}figcaption{font-size:.875rem;line-height:1.7;color:var(--muted);margin:12px auto 0;text-align:center}.context-photo{max-width:520px;margin:24px auto}.context-photo img{width:100%;border-radius:4px}.context-photo figcaption:empty{display:none}.photo-gallery>div{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;align-items:start}.photo-gallery img{width:100%;height:auto;border-radius:3px}.diagram{padding:22px;border:1px solid #dde7ef;border-radius:5px;background:#fbfcfd}.cap-diagram svg{display:block;width:100%;max-width:600px;height:auto;margin:auto}.needs-grid{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto auto;gap:14px;max-width:640px;margin:auto;text-align:center;align-items:center}.need-node{padding:18px 20px;border-radius:50px;line-height:1.5;font-weight:600}.node-0{background:#f7edc9;color:#6a5010;grid-column:1;grid-row:1}.node-1{background:#fff0de;color:#8c4a0b;grid-column:2;grid-row:1}.node-2{background:#e8f2df;color:#365d25;grid-column:1;grid-row:3}.node-3{background:#e7eefb;color:#314f88;grid-column:2;grid-row:3}.needs-center{grid-column:1/3;grid-row:2;background:#ffea86;color:#4e420e;max-width:360px;padding:20px;font-weight:700;justify-self:center;border-radius:4px;line-height:1.6}.sensory-flow{display:grid;grid-template-columns:1fr 1.25fr 1fr;gap:16px}.sensory-step{border-radius:5px;padding:18px 16px;line-height:1.65}.sensory-step h4{line-height:1.55;color:inherit;margin:0 0 14px}.sensory-step p{margin:0}.sensory-step ul,.sensory-step ol{padding-left:20px;margin:0}.sensory-step li{margin:8px 0}.step-0{background:#e9f3e0;color:#315625}.step-1{background:#e9effa;color:#2a4477}.step-2{background:#fff0e8;color:#884024}.feedback{border-top:2px solid #dec981;padding-top:12px;margin:16px 0 0;text-align:center;color:#6b5825;font-size:.9rem}.references{padding-left:1.8em;overflow-wrap:anywhere}.references li{padding-left:5px;margin:0 0 24px;font-size:.95rem}.reference-links{white-space:normal}.references a{display:inline;text-underline-offset:3px}.references a:hover{color:#0872b4}.references a:focus-visible{outline:2px solid #78b6df;outline-offset:3px}
@media(max-width:760px){.hero{display:grid;grid-template-columns:1fr;gap:22px;padding:26px 20px}.hero-copy{padding:0}.hero .cover{max-width:220px;max-height:240px}.hero h1{font-size:1.9rem}.version{margin-top:14px}.teaching-table{border:0;border-radius:0;overflow:visible}.teaching-table table,.teaching-table tbody,.teaching-table tr,.teaching-table th,.teaching-table td{display:block;width:100%;min-width:0!important}.teaching-table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.teaching-table tr{margin-bottom:18px;border:1px solid var(--line);border-radius:5px;overflow:hidden;background:#fff!important}.teaching-table tbody th{padding:13px 16px;background:#eaf2f7;font-size:1rem;border-bottom:1px solid var(--line)!important}.teaching-table td{padding:15px 16px;border-bottom:1px solid var(--line)!important}.teaching-table td:last-child{border-bottom:0!important}.teaching-table td:before{content:attr(data-label);display:block;font-size:.875rem;font-weight:650;color:#376581;margin-bottom:7px}.diagram{padding:14px 10px}.sensory-flow{grid-template-columns:1fr}.sensory-step{padding:17px}.needs-grid{gap:10px}.need-node{padding:14px 10px;font-size:.875rem}.needs-center{font-size:1rem;padding:15px}.photo-gallery>div{gap:8px}.age-bands{gap:6px}.age-bands span{font-size:.8125rem}.brand .brand-label{letter-spacing:.02em}.cap-diagram{padding:10px 0}.cap-diagram figcaption{padding:0 15px}}
@media print{.hero{min-height:0;grid-template-columns:70% 30%;padding:0}.hero .cover{max-height:180px}.diagram{break-inside:avoid}.teaching-table table{display:table;table-layout:fixed}.teaching-table thead{display:table-header-group;position:static;clip-path:none;width:auto;height:auto}.teaching-table tbody{display:table-row-group}.teaching-table tr{display:table-row}.teaching-table th,.teaching-table td{display:table-cell;width:auto}.teaching-table td:before{display:none}.sensory-flow{grid-template-columns:1fr 1.25fr 1fr}figure{break-inside:avoid}.age-bands span{background:white}}
.cap-mobile{display:none}.sensory-step{position:relative}.sensory-step:not(:last-child):after{content:"→";position:absolute;right:-17px;top:45%;width:18px;text-align:center;color:#697e91;font-weight:700}
/* A relevant visual anchors each illustrated table row. */
.row-visual{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.row-image{display:block;width:124px;max-width:100%;height:auto;aspect-ratio:1;object-fit:contain;border-radius:8px;background:#fff}
@media screen and (max-width:760px){.row-visual{flex-direction:row;align-items:center;gap:16px}.row-image{width:88px;flex:0 0 88px}.row-visual>span{min-width:0}}
@media print{.row-image{width:80px}.row-visual{gap:7px}}
@media(max-width:760px){.cap-diagram svg{display:none}.cap-mobile{display:grid;gap:10px;padding:4px 14px}.cap-mobile>div{padding:16px;border-radius:5px;background:#f0e7ef;color:#633650;text-align:center}.cap-mobile>div:nth-child(2){background:#edf1e0;color:#485a2e}.cap-mobile>div:nth-child(3){background:#fff0db;color:#865018}.cap-mobile strong{font-size:1.05rem}.cap-mobile p{margin:5px 0 0;font-size:1rem}.sensory-step:not(:last-child):after{content:"↓";top:auto;right:calc(50% - 9px);bottom:-20px;z-index:1}}

/* Varied scenes make the play chapter easier to scan without interrupting its copy. */
.learning-scene{margin:30px 0;padding-bottom:28px;border-bottom:1px solid var(--line)}
.learning-scene:first-child{margin-top:0}.learning-scene:last-child{margin-bottom:0;padding-bottom:0;border-bottom:0}
.section-body .learning-scene>h3{margin:0 0 18px;line-height:1.6}
.scene-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px;align-items:start}
.scene-image{display:block;width:100%;height:auto;aspect-ratio:1;object-fit:contain;border-radius:8px}
.scene-copy>p:first-child{margin-top:0}.scene-copy>p:last-child{margin-bottom:0}
.learning-scene--reverse .scene-layout{grid-template-columns:minmax(0,1fr) 200px}
.learning-scene--reverse .scene-image{grid-column:2;grid-row:1}.learning-scene--reverse .scene-copy{grid-column:1;grid-row:1}
@media screen and (max-width:760px){.scene-layout,.learning-scene--reverse .scene-layout{grid-template-columns:1fr;gap:18px}.scene-image{max-width:280px;justify-self:center}.learning-scene--reverse .scene-image,.learning-scene--reverse .scene-copy{grid-column:auto;grid-row:auto}.learning-scene{padding-bottom:24px;margin:26px 0}}
@media print{.scene-layout,.learning-scene--reverse .scene-layout{grid-template-columns:100px minmax(0,1fr);gap:16px}.learning-scene--reverse .scene-image,.learning-scene--reverse .scene-copy{grid-column:auto;grid-row:auto}.learning-scene>h3{break-after:avoid}.scene-image{break-inside:avoid}}