:root{--ink:#173b48;--muted:#607780;--paper:#fffdf7;--white:#fff;--coral:#ff7252;--coral2:#d94e31;--teal:#21b8a6;--yellow:#ffd45a;--blue:#4a91dc;--line:#dfe9e7;--shadow:0 15px 40px #183f4c22;--r:25px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans TC","Microsoft JhengHei",system-ui,sans-serif;background-image:radial-gradient(#eadfbf 1px,transparent 1px);background-size:26px 26px}.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#000;color:#fff;padding:8px;z-index:99}.top{height:74px;display:flex;align-items:center;gap:22px;padding:0 clamp(16px,6vw,80px);position:sticky;top:0;z-index:30;background:#fffdf7f2;backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}button{font:inherit}.logo{border:0;background:none;display:flex;align-items:center;gap:10px;font-size:20px;font-weight:1000;color:var(--ink);cursor:pointer}.logo b{display:grid;place-items:center;width:46px;height:46px;border-radius:15px;background:var(--coral);color:#fff;font-size:14px;transform:rotate(-4deg)}.overall{margin-left:auto;display:flex;align-items:center;gap:10px;font-size:13px;font-weight:900}.overall i,.lesson-progress i{display:block;width:min(18vw,180px);height:10px;border-radius:99px;background:#e6e5dd;overflow:hidden}.overall em,.lesson-progress em{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--yellow),var(--coral));transition:.4s}.round{width:44px;height:44px;border:0;border-radius:50%;background:#fff;box-shadow:0 5px 16px #173b4822;cursor:pointer}.hero{min-height:570px;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;padding:65px clamp(24px,8vw,120px);background:linear-gradient(135deg,#fff4c9,#d9f7f2);overflow:hidden}.kicker{color:var(--coral);font-size:14px;font-weight:1000;letter-spacing:.12em}.hero h1{font-size:clamp(50px,7vw,90px);letter-spacing:-.06em;line-height:1.02;margin:12px 0 22px}.hero h1 span{color:var(--coral)}.hero p:not(.kicker){font-size:20px;line-height:1.7;color:var(--muted);max-width:630px}.cta,.ghost{border:0;border-radius:99px;padding:15px 24px;font-weight:1000;cursor:pointer}.cta{background:var(--coral);color:#fff;box-shadow:0 7px 0 var(--coral2)}.cta:hover{transform:translateY(-2px)}.cta:active{transform:translateY(5px);box-shadow:0 2px 0 var(--coral2)}.ghost{background:#fff;color:var(--ink);border:2px solid var(--line)}.hero-art{height:400px;position:relative}.isle{position:absolute;width:280px;height:190px;border-radius:50%;background:#6dc77f;box-shadow:inset 0 -35px #3fa266,0 26px 0 -8px #65c3de;left:50%;top:50%;transform:translate(-50%,-42%) rotate(-4deg);display:grid;place-content:center;text-align:center}.isle b{font-size:100px;line-height:.9;color:#fff;text-shadow:0 7px #2b9153}.isle span{font-weight:1000}.fox{position:absolute;left:15%;bottom:32px;width:95px;height:90px;border-radius:50%;background:#f48b43;display:grid;place-items:center;font-size:25px;font-weight:900}.orbit{position:absolute;width:66px;height:66px;border-radius:22px;display:grid;place-items:center;font-size:35px;font-weight:1000;box-shadow:var(--shadow);background:#fff}.o1{top:20px;left:12%;color:var(--coral);transform:rotate(-8deg)}.o2{top:42px;right:8%;color:var(--blue);transform:rotate(10deg)}.o3{bottom:24px;right:12%;color:var(--teal);transform:rotate(-5deg)}.curriculum{max-width:1200px;margin:auto;padding:80px 24px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:32px}.section-head h2,.stage-title h2,.stage-copy h2{font-size:clamp(32px,4vw,50px);margin:8px 0}.semester-tabs{background:#ecefe9;padding:5px;border-radius:16px;display:flex}.semester-tabs button{border:0;background:none;padding:12px 18px;border-radius:12px;font-weight:900;color:var(--muted);cursor:pointer}.semester-tabs .active{background:#fff;color:var(--ink);box-shadow:0 4px 15px #173b4818}.unit-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.unit-card{border:0;text-align:left;background:#fff;border-radius:22px;padding:22px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;box-shadow:0 8px 24px #173b4812;cursor:pointer;color:var(--ink);transition:.2s}.unit-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.unit-num{width:66px;height:66px;border-radius:19px;display:grid;place-items:center;font-size:28px;font-weight:1000;color:#fff;background:var(--accent,var(--teal))}.unit-card h3{margin:0 0 5px;font-size:20px}.unit-card p{margin:0;color:var(--muted);font-size:14px}.unit-status{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#edf2f0;color:#9cadad}.unit-card.done .unit-status{background:var(--yellow);color:var(--ink)}.how{max-width:1100px;margin:0 auto 90px;background:var(--ink);border-radius:28px;color:#fff;padding:30px;display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.how div{display:flex;align-items:center;gap:14px}.how b{width:45px;height:45px;display:grid;place-items:center;border-radius:50%;background:var(--yellow);color:var(--ink)}.how strong,.how span{display:block}.how span{color:#c9dadd}.lesson-hero{padding:55px clamp(24px,8vw,120px) 40px;background:linear-gradient(135deg,#fff4ca,#e1f7f4)}.back{border:0;background:none;color:var(--ink);font-weight:900;cursor:pointer}.lesson-hero>p{color:var(--coral);font-weight:900}.lesson-hero h1{font-size:clamp(44px,7vw,75px);margin:10px 0;letter-spacing:-.05em}.lesson-hero #lessonGoal{color:var(--muted);font-size:19px;font-weight:500}.lesson-progress{display:flex;gap:12px;align-items:center;margin-top:28px;font-size:13px;font-weight:900}.stage-tabs{display:flex;justify-content:center;gap:15px;padding:20px;position:sticky;top:74px;z-index:20;background:#fffffff2;border-bottom:1px solid var(--line)}.stage-tabs button{border:0;border-radius:16px;background:#eef1ee;color:var(--muted);padding:12px 24px;font-weight:1000;cursor:pointer}.stage-tabs span{display:inline-grid;place-items:center;width:25px;height:25px;border-radius:50%;background:#fff;margin-right:6px}.stage-tabs .active{background:var(--ink);color:#fff}.stage{max-width:1100px;margin:auto;padding:65px 24px 90px}.stage-copy{display:inline-block;width:47%;vertical-align:middle}.stage-copy>p:not(.kicker){color:var(--muted);font-size:18px;line-height:1.8}.tip{background:#fff4d0;border-left:6px solid var(--yellow);border-radius:14px;padding:16px;font-weight:800;line-height:1.6}.concept-visual{display:inline-flex;width:47%;min-height:330px;vertical-align:middle;margin-left:5%;background:#fff;border-radius:var(--r);box-shadow:var(--shadow);align-items:center;justify-content:center;padding:28px}.next-stage{display:block;margin:45px auto 0}.stage-title{text-align:center;max-width:750px;margin:0 auto 28px}.stage-title p:last-child{color:var(--muted);font-size:17px}.workbench{min-height:380px;border-radius:var(--r);background:#fff;box-shadow:var(--shadow);padding:30px;display:grid;place-items:center}.live-feedback{text-align:center;min-height:28px;margin:22px;font-size:19px;font-weight:1000;color:var(--teal)}.visual-number,.math-demo{text-align:center;width:100%}.visual-number strong{font-size:100px;color:var(--coral)}.place-blocks{display:flex;gap:12px;align-items:end;justify-content:center;margin-top:20px}.place-blocks i{display:block;background:var(--blue);border:3px solid #2169a9}.place-blocks .hundred{width:100px;height:100px;background-image:linear-gradient(#2169a9 1px,transparent 1px),linear-gradient(90deg,#2169a9 1px,transparent 1px);background-size:10px 10px}.place-blocks .ten{width:20px;height:100px;background:var(--yellow);border-color:#d9a71c}.place-blocks .one{width:20px;height:20px;background:var(--coral);border-color:var(--coral2)}.big-equation{font-size:clamp(42px,8vw,78px);font-weight:1000}.demo-note{color:var(--muted);font-weight:800}.control-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:20px}.control-row button{border:2px solid var(--line);background:#fff;border-radius:14px;padding:11px 18px;font-weight:900;cursor:pointer}.control-row button.active{background:var(--yellow);border-color:#dca913}.range-wrap{width:min(700px,90%);text-align:center}.range-wrap output{display:block;font-size:62px;font-weight:1000;color:var(--coral)}input[type=range]{appearance:none;width:100%;height:14px;border-radius:99px;background:linear-gradient(90deg,var(--teal),var(--coral));margin:25px 0}input[type=range]::-webkit-slider-thumb{appearance:none;width:34px;height:34px;border-radius:50%;background:#fff;border:7px solid var(--ink)}.blocks-row,.shape-board,.sort-bins,.share-plates{display:flex;gap:10px;justify-content:center;align-items:center;flex-wrap:wrap}.cube{width:38px;height:38px;background:var(--coral);border:3px solid var(--coral2);border-radius:6px;display:grid;place-items:center;color:#fff;font-weight:900;cursor:pointer}.cube.on{background:var(--yellow);border-color:#d19e0b;color:var(--ink)}.number-line{width:90%;height:110px;border-bottom:8px solid var(--teal);display:flex;justify-content:space-between;align-items:end;padding-bottom:12px}.number-line span{position:relative;font-weight:900}.number-line span:after{content:"";position:absolute;width:3px;height:15px;background:var(--ink);bottom:-27px;left:50%}.clock{width:260px;height:260px;border:13px solid var(--ink);border-radius:50%;position:relative;background:#fff8d5}.clock b,.clock i{position:absolute;left:50%;top:50%;border-radius:8px;transform-origin:bottom}.clock b{width:9px;height:80px;background:var(--coral);transform:translate(-50%,-100%) rotate(var(--min,0deg))}.clock i{width:11px;height:58px;background:var(--ink);transform:translate(-50%,-100%) rotate(var(--hour,0deg))}.clock:after{content:"";position:absolute;width:20px;height:20px;border-radius:50%;background:var(--yellow);left:50%;top:50%;transform:translate(-50%,-50%)}.clock span{position:absolute;font-weight:1000}.clock span:nth-of-type(1){top:6px;left:47%}.clock span:nth-of-type(2){right:12px;top:45%}.clock span:nth-of-type(3){bottom:6px;left:47%}.clock span:nth-of-type(4){left:12px;top:45%}.area-grid,.array-grid{display:grid;grid-template-columns:repeat(var(--cols,5),42px);gap:5px}.area-grid i,.array-grid i{aspect-ratio:1;background:#bdece6;border:2px solid var(--teal);border-radius:5px}.balance{width:80%;height:210px;position:relative}.balance:before{content:"";position:absolute;width:80%;height:10px;background:var(--ink);left:10%;top:85px;transform:rotate(var(--tilt,0deg));transition:.3s}.balance:after{content:"";position:absolute;border-left:55px solid transparent;border-right:55px solid transparent;border-bottom:110px solid var(--yellow);left:50%;bottom:0;transform:translateX(-50%)}.pan{position:absolute;top:25px;width:110px;height:65px;border-bottom:7px solid var(--coral);border-radius:0 0 50% 50%;font-size:40px;font-weight:1000;text-align:center}.pan.left{left:8%}.pan.right{right:8%}.shape-board{min-height:250px}.shape{width:110px;height:110px;border:8px solid var(--blue);background:#ddecfb;cursor:pointer;display:grid;place-items:center;font-weight:900}.shape.circle{border-radius:50%}.shape.triangle{clip-path:polygon(50% 0,100% 100%,0 100%);background:var(--yellow);border:0}.shape.rect{width:160px}.shape.active{filter:drop-shadow(0 0 8px var(--coral));transform:scale(1.08)}.calendar-grid{display:grid;grid-template-columns:repeat(7,44px);gap:5px}.calendar-grid i{height:40px;background:#eef2ef;border-radius:6px;display:grid;place-items:center;font-style:normal}.calendar-grid i.on{background:var(--yellow);font-weight:1000}.sort-bins{width:100%}.bin{min-width:180px;min-height:150px;border:3px dashed var(--teal);border-radius:20px;padding:15px;text-align:center}.token{display:inline-grid;place-items:center;width:55px;height:55px;border-radius:12px;background:var(--coral);color:#fff;font-weight:1000;margin:5px;cursor:pointer}.share-plates .plate{width:130px;min-height:100px;border:5px solid #91c9df;border-radius:50%;padding:15px;text-align:center}.fraction-pie{width:250px;height:250px;border-radius:50%;background:conic-gradient(var(--coral) 0 var(--part,25%),#eee var(--part,25%) 100%);border:8px solid #fff;box-shadow:0 0 0 4px var(--ink)}.quiz-card,.finish-card{max-width:760px;margin:auto;background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:34px;text-align:center}.quiz-count{color:var(--muted);font-weight:900}.quiz-stars{font-size:31px;color:#e9b019;letter-spacing:7px}.quiz-card h3{font-size:clamp(25px,4vw,38px);margin:25px}.answers{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.answers button{border:3px solid var(--line);background:#fff;border-radius:18px;padding:18px;font-size:22px;font-weight:1000;cursor:pointer}.answers button:hover{border-color:var(--teal)}.answers button.correct{background:#dff8f2;border-color:var(--teal)}.answers button.wrong{background:#ffe5de;border-color:var(--coral)}.quiz-feedback{min-height:28px;font-weight:900}.finish-card{margin-top:40px;background:#fff5cf}.badge{width:90px;height:90px;border-radius:50%;display:grid;place-items:center;background:var(--yellow);font-size:45px;margin:-75px auto 10px;border:8px solid var(--paper)}.finish-actions{display:flex;justify-content:center;gap:12px}.toast{position:fixed;left:50%;bottom:25px;transform:translate(-50%,120px);background:var(--ink);color:#fff;padding:13px 22px;border-radius:99px;font-weight:900;z-index:99;transition:.3s}.toast.show{transform:translate(-50%,0)}footer{background:var(--ink);color:#d5e3e6;padding:26px clamp(24px,8vw,120px);display:flex;justify-content:space-between;font-size:13px}@media(max-width:760px){.top{height:66px;padding:0 13px}.logo span{display:none}.overall i{width:85px}.hero{grid-template-columns:1fr;padding:45px 22px}.hero-art{height:300px}.isle{width:220px;height:150px}.isle b{font-size:75px}.section-head{display:block}.semester-tabs{margin-top:20px}.unit-grid{grid-template-columns:1fr}.how{margin:0 15px 65px;grid-template-columns:1fr}.stage-tabs{top:66px;gap:5px;padding:10px}.stage-tabs button{padding:10px}.stage-copy,.concept-visual{width:100%;margin:0}.concept-visual{margin-top:28px;min-height:280px}.answers{grid-template-columns:1fr}.workbench{padding:18px}.calendar-grid{grid-template-columns:repeat(7,36px)}.calendar-grid i{height:34px}.balance{width:100%}footer{display:block}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
