:root{--ink:#143a45;--paper:#faf7f0;--muted:#50666b;--line:#d8e0dc}*{box-sizing:border-box}body{margin:0;background:#e8eeeb;color:var(--ink);font-family:'PingFang SC','Microsoft YaHei',sans-serif}button,select{font:inherit;color:inherit;min-height:44px;border:1px solid var(--line);border-radius:5px;background:white;padding:9px 14px;font-size:16px}button{cursor:pointer}button:hover{background:#e1efeb}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #ba583b;outline-offset:3px}[hidden]{display:none!important}.topbar{max-width:1500px;margin:auto;display:flex;align-items:center;gap:24px;padding:18px 30px}.brand{font-weight:900;font-size:26px;color:var(--ink);text-decoration:none}.brand span{color:#bd583c}.edition{flex:1}.edition small{margin-left:12px;color:var(--muted)}.plain{border:0;background:transparent}#app{max-width:1500px;margin:auto;padding:0 30px}.toolbar{display:flex;gap:10px;padding-bottom:14px;align-items:center}.spacer{flex:1}#level{font-weight:700;max-width:42%}#contents{background:var(--paper);padding:16px;display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:14px}#contents button{text-align:left;border:0;background:none}#contents button[aria-current=true]{background:var(--ink);color:white}.slide{position:relative;display:flex;flex-direction:column;aspect-ratio:16/9;min-height:600px;background:var(--paper);padding:3.5% 4.5%;overflow:hidden}.slideTop{display:flex;justify-content:space-between;gap:20px;font-size:14px;letter-spacing:1.5px;font-weight:700;margin-bottom:2.5%;color:var(--accent)}.serial{font-weight:500;color:var(--muted)}.slideMain{display:flex;flex-direction:column;justify-content:center;flex:1;max-width:92%}.slide h1{font-size:clamp(34px,4vw,57px);line-height:1.25;letter-spacing:-1px;white-space:pre-line;margin:0 0 25px;font-weight:850}.bodycopy{font-size:clamp(23px,2.6vw,36px);line-height:1.65;margin:0;white-space:pre-line}.task{font-size:clamp(18px,1.7vw,24px);line-height:1.6;border-top:2px solid var(--accent);margin-top:24px;padding-top:12px;white-space:pre-line}.task b{font-size:13px;letter-spacing:1px;display:block;color:var(--accent);margin-bottom:5px}.image .slideMain,.video .slideMain{max-width:35%;justify-content:flex-start;padding-top:2%}.image h1,.video h1{font-size:clamp(31px,3.1vw,46px)}.image .bodycopy,.video .bodycopy{font-size:clamp(21px,2.15vw,30px)}.image .task,.video .task{max-width:35%;margin-top:auto}.gallery{position:absolute;right:4%;top:16%;width:55%;height:72%;display:flex;align-items:stretch;gap:10px}.gallery button{padding:0;border:0;background:transparent;min-width:0;flex:1;border-radius:0;display:flex;align-items:center;justify-content:center}.gallery button:hover{background:#fff8}.gallery img{width:100%;height:100%;object-fit:contain;background:white}.gallery.count-2,.gallery.count-3{align-content:center;flex-wrap:wrap}.gallery.count-2 button{flex:1 1 45%}.gallery.count-3 button{flex:1 1 30%}.video video{position:absolute;right:4%;top:16%;width:55%;height:68%;background:#102630;object-fit:contain}.video-fallback{position:absolute;right:4%;bottom:8%;width:55%;font-size:13px}.video-fallback a{color:inherit}.bottom{display:flex;gap:18px;justify-content:space-between;align-items:center;padding:16px 0;position:sticky;bottom:0;background:#e8eeebf5;z-index:2}.bottom button{min-width:125px;font-weight:600}.pagebox{display:flex;align-items:center;gap:18px;width:45%;max-width:520px}#pageCount{white-space:nowrap;font-size:14px;font-variant-numeric:tabular-nums}#pageRange{width:100%;height:34px;accent-color:var(--ink)}#coach{background:white;padding:26px 32px;margin-bottom:20px;font-size:18px;line-height:1.85;border-top:4px solid #b95b3f}.coachhead{display:flex;justify-content:space-between;gap:20px;align-items:center}.coachhead h2{font-size:24px;margin:0}.coachhead label{font-size:14px}#age{margin-left:8px}.sourceNote{font-size:14px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:12px}.ageNote{background:#f8f1df;padding:15px 20px}details{border-top:1px solid var(--line);margin-top:14px;padding-top:14px}summary{cursor:pointer;padding:8px 0;min-height:44px;font-weight:600}.standards{font-size:16px}.standardBand h3{font-size:18px}#help{max-width:1440px;margin:10px auto 30px;background:var(--paper);padding:30px 40px;font-size:18px;line-height:1.85}.helphead{display:flex;justify-content:space-between;gap:20px}.helphead h2{margin:0}#help a{color:#21657a}.sitefoot{max-width:1500px;margin:auto;padding:12px 30px 30px;font-size:12px;color:var(--muted);display:flex;justify-content:space-between}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}#printArea{display:none}#imageDialog{border:0;padding:20px;background:#fff;width:min(95vw,1500px);max-height:95vh;color:var(--ink)}#imageDialog::backdrop{background:#0b2226df}#closeImage{display:block;margin:0 0 12px auto}#largeImage{display:block;width:100%;height:73vh;object-fit:contain}#largeCaption{margin:12px 0 0;font-size:14px;text-align:center}body.presenting{overflow:hidden}body.presenting #app,:fullscreen{position:fixed;inset:0;z-index:20;width:100%;max-width:none;padding:12px;background:#e8eeeb;overflow:auto}body.presenting .slide,:fullscreen .slide{height:calc(100dvh - 164px);min-height:540px;aspect-ratio:auto}
@media(min-width:1500px){.slide h1{font-size:57px}.bodycopy{font-size:36px}.image h1,.video h1{font-size:46px}.image .bodycopy,.video .bodycopy{font-size:30px}}
@media(max-width:760px){.topbar{padding:14px 18px;gap:12px;flex-wrap:wrap}.brand{font-size:22px}.edition{font-size:14px}.edition small{display:block;margin:2px 0 0;font-size:11px}.topbar button{font-size:14px;padding:6px}#app{padding:0 12px}.toolbar{flex-wrap:wrap;gap:7px}.toolbar button,.toolbar select{font-size:14px;padding:7px 10px}#level{max-width:none;flex:1;min-width:200px}.spacer{display:none}#notesBtn{margin-left:auto}.slide{min-height:540px;aspect-ratio:auto;padding:25px 23px;overflow:visible}.slideTop{font-size:11px;letter-spacing:1px;margin-bottom:25px}.slideMain,.image .slideMain,.video .slideMain{max-width:100%;padding:0}.slide h1,.image h1,.video h1{font-size:33px;letter-spacing:-.7px;margin-bottom:20px}.bodycopy,.image .bodycopy,.video .bodycopy{font-size:24px;line-height:1.7}.task,.image .task,.video .task{max-width:100%;font-size:19px;order:3;margin-top:22px}.gallery{position:static;width:100%;height:320px;margin-top:25px;order:2}.gallery.count-2{height:400px}.gallery.count-3{height:520px;flex-direction:column;flex-wrap:nowrap}.gallery.count-2 button{height:190px;flex-basis:100%}.gallery.count-3 button{height:160px;flex-basis:30%}.video video{position:static;width:100%;height:360px;margin-top:24px}.video-fallback{position:static;width:100%;font-size:12px;margin-top:6px}.bottom{gap:10px}.bottom button{min-width:48px;padding:9px 12px}.bottom button span{display:none}.pagebox{width:auto;flex:1;gap:10px}#contents{grid-template-columns:1fr;max-height:55vh;overflow:auto}#coach{padding:23px 19px;font-size:17px}.coachhead{display:block}.coachhead h2{margin-bottom:12px}#age{display:block;width:100%;margin:6px 0 0}.ageNote{padding:13px}#help{margin:10px 12px;padding:23px 20px;font-size:17px}.helphead{display:block}.sitefoot{display:block;padding:12px 18px 24px}.sitefoot span{display:block;margin-top:7px}body.presenting .slide,:fullscreen .slide{height:auto;min-height:65vh}#largeImage{height:70vh}}
@media print{@page{size:A4 landscape;margin:0}body>*:not(#printArea){display:none!important}#printArea{display:block}.slide,body.presenting .slide{width:297mm;height:210mm;min-height:0;aspect-ratio:auto;padding:15mm 18mm;break-after:page;print-color-adjust:exact;-webkit-print-color-adjust:exact}.slide:last-child{break-after:auto}.slide h1{font-size:32pt}.bodycopy{font-size:23pt}.image h1,.video h1{font-size:28pt}.image .bodycopy,.video .bodycopy{font-size:19pt}.task,.image .task,.video .task{font-size:16pt}.slideTop{font-size:10pt}.gallery{top:18%;height:67%;width:54%;right:4%}.printVideo{font-size:14pt;overflow-wrap:anywhere;padding-top:20px}.printVideo a{font-size:10pt}}
.slide h1{text-wrap:balance}
.gallery.count-2,.gallery.count-3{flex-wrap:nowrap;align-items:stretch}.gallery button{height:100%;min-height:0;overflow:hidden}.gallery img{min-height:0}
@media(max-width:760px){.gallery.count-2,.gallery.count-3{flex-direction:column}.gallery.count-2 button,.gallery.count-3 button{height:auto;flex:1;min-height:0}}

/* SurfPlus Kids identity: original supplied logo; sampled sRGB brand palette. */
:root{--ink:#103f46;--paper:#fffdf6;--muted:#49676b;--teal:#00979d;--orange:#e73d0e;--mint:#e2f3ef}
.topbar .brand{font-family:Georgia,serif;font-style:italic}.topbar .brand span{font:600 18px 'PingFang SC',sans-serif;color:#00747b;margin-left:8px}
.slide{padding-top:130px;min-height:650px;box-shadow:0 8px 30px #143a4510}
.slideTop{position:absolute;inset:0 0 auto;height:112px;padding:12px 4.5%;margin:0;background:var(--teal);color:white;align-items:center;gap:24px;letter-spacing:.5px}
.kidsLogo{display:inline-block;position:relative;width:210px;height:83.21px;overflow:hidden;flex-shrink:0;background:var(--teal)}
.kidsLogo img{position:absolute;width:110.3774%;max-width:none;height:auto;left:-6.6038%;top:-90.4762%}
.lessonLabel{margin-left:auto;font-size:17px;letter-spacing:1px}.serial{color:white;font-size:14px}
.learningMode{margin:0 0 16px;color:#00747b;font-size:17px;font-weight:700;letter-spacing:1px}.slideMain{justify-content:center}
.task{border-top:0;border-left:5px solid var(--orange);padding:16px 20px;background:var(--mint);font-weight:650;margin-top:22px}.task b{color:#006870;font-size:14px}
.image .slideMain,.video .slideMain{padding-top:12px;max-width:37%}.image h1,.video h1{font-size:clamp(29px,2.8vw,43px);margin-bottom:20px}.image .bodycopy,.video .bodycopy{font-size:clamp(21px,2vw,29px);line-height:1.55}.image .task,.video .task{max-width:37%;font-size:clamp(18px,1.55vw,23px)}
.gallery{top:22%;height:70%;width:54%;right:4%}.video video{top:22%;height:65%;width:54%;right:4%}.video-fallback{bottom:6%;width:54%}
.portraitVideo .slideMain{max-width:55%}.portraitVideo .task{max-width:55%}.portraitVideo video{width:28%;height:73%;top:20%;right:8%;background:#103f46}.portraitVideo .video-fallback{width:28%;right:8%;bottom:3%}
.longCopy .bodycopy{font-size:clamp(21px,1.9vw,27px)}
.levelCover{background:var(--teal);color:white;padding:0;display:block;--accent:white}
.coverArt{position:absolute;right:0;top:0;width:51%;height:100%;object-fit:cover;object-position:100% center}
.coverBrand{position:absolute;top:5%;left:4.5%}.coverBrand .kidsLogo{width:290px;height:114.9px}
.coverText{position:absolute;left:4.5%;top:29%;width:40.5%}.coverLevel{font-size:20px;margin:0 0 24px;letter-spacing:1px;font-weight:650}.levelCover h1{font-size:clamp(40px,4.5vw,65px);line-height:1.25;margin-bottom:25px}.levelCover .bodycopy{font-size:clamp(22px,2.1vw,30px);line-height:1.55}.levelCover .task{position:absolute;left:4.5%;bottom:10%;width:40%;background:transparent;border-left:5px solid var(--orange);padding:4px 0 4px 18px;font-size:clamp(18px,1.65vw,24px);font-weight:650;line-height:1.5}.levelCover .task b{color:#e3fffc;font-size:14px;margin-bottom:7px}.coverAge{position:absolute;bottom:4%;left:4.5%;font-size:14px;letter-spacing:2px}.artNote{position:absolute;right:12px;bottom:12px;background:#fffdf6c9;color:#345b60;padding:4px 8px;font-size:11px}
#pageRange{accent-color:var(--teal)}#coach{border-top-color:var(--orange)}.ageNote{background:var(--mint)}
body.presenting .slide,:fullscreen .slide{min-height:560px}
@media(min-width:761px) and (max-width:1100px){.slide{min-height:620px}.slideTop{height:98px}.kidsLogo{width:180px;height:71.32px}.slide{padding-top:114px}.image h1,.video h1{font-size:31px}.image .bodycopy,.video .bodycopy{font-size:23px}.image .task,.video .task{font-size:19px}.levelCover h1{font-size:44px}.coverBrand .kidsLogo{width:250px;height:99.06px}.coverText{top:28%}}
@media(max-width:760px){
.toolbar button,.toolbar select{font-size:16px}.slide{padding:112px 22px 26px;min-height:540px;overflow:hidden;aspect-ratio:auto}.slideTop{height:90px;padding:8px 18px;gap:10px;flex-wrap:nowrap}.kidsLogo{width:160px;height:63.4px}.lessonLabel{font-size:14px;letter-spacing:0;max-width:calc(100% - 170px);text-align:right}.serial{display:none}.learningMode{font-size:15px;margin-bottom:13px}
.slideMain,.image .slideMain,.video .slideMain,.portraitVideo .slideMain{max-width:100%;padding:0}.slide h1,.image h1,.video h1{font-size:32px;line-height:1.3}.bodycopy,.image .bodycopy,.video .bodycopy,.longCopy .bodycopy{font-size:23px;line-height:1.65}.task,.image .task,.video .task,.portraitVideo .task{max-width:100%;font-size:19px;margin-top:22px;padding:14px 16px}
.gallery{position:static;width:100%;height:330px;margin-top:24px}.gallery.count-2{height:500px}.gallery.count-3{height:660px}.video video,.portraitVideo video{position:static;width:100%;height:350px;margin-top:22px}.portraitVideo video{height:480px}.video-fallback,.portraitVideo .video-fallback{position:static;width:100%;font-size:13px;margin-top:8px}
.levelCover{padding:0 0 25px;display:flex;min-height:0}.coverBrand{position:relative;left:auto;top:auto;padding:12px 22px 0}.coverBrand .kidsLogo{width:240px;height:95.1px}.coverText{position:relative;top:auto;left:auto;width:auto;padding:20px 24px 0}.coverLevel{font-size:17px;margin-bottom:17px}.levelCover h1{font-size:42px;line-height:1.25;margin-bottom:19px}.levelCover .bodycopy{font-size:23px}.coverArt{position:static;order:3;width:100%;height:290px;object-fit:cover;object-position:50% 62%;margin-top:25px}.levelCover .task{position:static;order:4;width:auto;max-width:none;margin:24px 24px 0;font-size:20px}.coverAge{position:static;order:5;margin:20px 24px 0;font-size:12px}.artNote{display:none}.levelCover .coverBrand{order:0}.levelCover .coverText{order:1}.bottom{padding-bottom:max(16px,env(safe-area-inset-bottom))}body.presenting .slide,:fullscreen .slide{min-height:540px;height:auto}.levelCover .task b{font-size:14px}
}
@media print{.slide{padding-top:35mm}.slideTop{height:28mm}.kidsLogo{width:55mm;height:21.79mm}.lessonLabel{font-size:12pt}.serial{font-size:10pt}.image .task,.video .task{font-size:15pt}.levelCover{padding:0}.levelCover h1{font-size:38pt}.levelCover .bodycopy{font-size:20pt}.levelCover .task{font-size:16pt}.coverBrand .kidsLogo{width:70mm;height:27.74mm}.coverLevel{font-size:14pt}.learningMode{font-size:12pt}.image h1,.video h1{font-size:26pt}.printVideo{font-size:11pt}}
@media screen and (min-width:761px){
#stage{width:min(100%,calc((100dvh - 205px)*1.777778));margin:0 auto;container-type:inline-size}.slide{min-height:0;aspect-ratio:16/9;padding-top:17%}.slideTop{height:14.4%;padding:1% 4.5%}.kidsLogo{width:16cqw;height:6.34cqw}.lessonLabel{font-size:clamp(12px,1.35cqw,18px)}.serial{font-size:clamp(11px,1.15cqw,15px)}.slide h1{font-size:4.1cqw;margin-bottom:1.6cqw}.bodycopy{font-size:2.6cqw;line-height:1.6}.learningMode{font-size:1.35cqw;margin-bottom:1.2cqw}.image h1,.video h1{font-size:3.2cqw}.image .bodycopy,.video .bodycopy{font-size:2.15cqw}.longCopy .bodycopy{font-size:1.9cqw}.task,.image .task,.video .task{font-size:1.75cqw;padding:1.1cqw 1.4cqw;margin-top:1.5cqw}.task b{font-size:1.1cqw}.image .task,.video .task{margin-top:auto}.image .slideMain,.video .slideMain{padding-top:0}.levelCover{padding:0}.coverBrand .kidsLogo{width:22cqw;height:8.72cqw}.levelCover h1{font-size:4.4cqw}.levelCover .bodycopy{font-size:2.2cqw}.coverLevel{font-size:1.5cqw;margin-bottom:1.8cqw}.levelCover .task{font-size:1.75cqw;padding:0 0 0 1.3cqw}.levelCover .task b{font-size:1.1cqw}.coverAge{font-size:1.05cqw}.artNote{font-size:.85cqw}.video-fallback{font-size:1cqw}
body.presenting #stage,:fullscreen #stage{width:min(100%,calc((100dvh - 164px)*1.777778))}body.presenting .slide,:fullscreen .slide{height:auto;min-height:0;aspect-ratio:16/9}
}