@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600;700;800;900&display=swap');
:root{--ink:#253a32;--green:#32684f;--muted:#7a847a;--paper:#f6f7f1;--line:#e2e6dc;--lime:#e7f0b5}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Noto Sans TC',sans-serif;font-size:15px;line-height:1.7}button,input,textarea,select{font:inherit}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #a5c94c;outline-offset:4px}a{color:var(--green)}.sidebar{position:fixed;inset:0 auto 0 0;width:252px;background:#fff;border-right:1px solid var(--line);padding:36px 23px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-weight:800;font-size:18px;line-height:1.6}.brand small{display:block;font-size:9px;letter-spacing:2px;color:#879187}.logo{background:var(--green);color:var(--lime);border-radius:13px;width:43px;height:43px;display:grid;place-items:center;font-size:36px}.course-label{font-size:11px;letter-spacing:1px;color:var(--muted);margin:49px 7px 16px;display:flex;justify-content:space-between}.course-label span{letter-spacing:0}nav{display:grid;gap:10px}.nav-item{border:0;background:transparent;display:flex;align-items:center;text-align:left;gap:12px;padding:14px 12px;border-radius:10px;color:#858b83;width:100%}.nav-item.active{background:#edf3e4;color:var(--green)}.nav-number{font-size:12px;border:1px solid #dce3d5;border-radius:8px;width:30px;height:30px;display:grid;place-items:center;flex-shrink:0}.active .nav-number{background:var(--green);color:#fff;border-color:var(--green)}.nav-item strong{font-weight:600;font-size:14px;display:block}.nav-item small{font-size:10px;display:block;margin-top:1px}.sidebar-bottom{margin-top:auto;font-size:11px;color:var(--muted);padding:24px 7px 0}.status-dot{display:inline-block;background:#659a60;width:6px;height:6px;border-radius:50%;margin-right:5px}.sidebar-bottom p{font-size:11px}.text-button{border:0;background:none;padding:10px 0;color:var(--green);font-size:12px}.workspace{margin-left:252px}header{height:77px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 48px;font-size:12px;color:#7d877c}.header-slash{margin:0 15px;color:#b8c0b1}.quiet{background:transparent;border:1px solid #d6dece;color:var(--green);border-radius:7px;padding:8px 14px;font-size:12px}main{max-width:1240px;margin:auto;padding:32px 48px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2.4px;display:flex;justify-content:space-between;color:#7c8b72}.eyebrow span{color:#a0aa98}.hero{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:20px;padding:29px 0 32px}.pill{display:inline-block;font-size:10px;color:#5c7349;background:#e9eedb;border-radius:20px;padding:4px 12px}h1{font-size:clamp(32px,3.4vw,49px);line-height:1.35;letter-spacing:-2px;margin:17px 0 16px;font-weight:800}h1 em{font-style:normal;color:#61805a}.hero p{font-size:13px;color:#7a8474;line-height:1.95}.hero-tags{display:flex;gap:20px;font-size:11px;color:#63765c;margin-top:20px}.orbit-art{position:relative;height:260px;overflow:hidden}.orbit{position:absolute;left:50%;top:50%;border:1px solid #dbe1cf;border-radius:50%;transform:translate(-50%,-50%) rotate(-28deg)}.o1{width:310px;height:185px}.o2{width:230px;height:240px;transform:translate(-50%,-50%) rotate(38deg)}.art-star{position:absolute;left:39%;top:16%;font-size:115px;color:#b6cd7c;line-height:1}.search-doodle{position:absolute;top:48%;left:10%;right:3%;padding:16px 18px;background:white;border:1px solid #dfe4d5;border-radius:14px;box-shadow:0 12px 25px #48632b0c;transform:rotate(-6deg);font-size:25px;color:var(--green);display:flex;gap:14px;align-items:center}.search-doodle span{font-size:12px;flex:1}.search-doodle b{font-size:16px;background:#f0f3e6;padding:0 9px;border-radius:5px}.float-chip{position:absolute;background:#eff1df;border:1px solid #dce3c9;border-radius:7px;padding:7px 12px;font-size:10px;transform:rotate(6deg)}.c1{right:0;top:14%}.c2{bottom:7%;left:17%;background:#fff;transform:rotate(-3deg)}.tiny-spark{position:absolute;bottom:3%;right:9%;font-size:35px;color:#819e66}.progress-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:17px 23px;margin-bottom:27px}.progress-card>div:first-child{display:flex;justify-content:space-between;font-size:11px;margin-bottom:10px}.progress-card strong{font-weight:600}.progress-card span{color:var(--muted)}.track{height:5px;background:#edf0e6;border-radius:5px;overflow:hidden}#progressBar{height:100%;background:#90ac5a;transition:width .3s}.lesson-card{border:1px solid var(--line);border-radius:14px;background:white;overflow:hidden}.lesson-top{padding:25px 29px 20px;border-bottom:1px solid #edf0e7;display:flex;justify-content:space-between;align-items:center}.section-kicker{font-size:10px;letter-spacing:1.5px;color:#849473}.lesson-top h2{font-size:23px;margin:4px 0}.lesson-top p{font-size:12px;color:var(--muted);margin:0}.time-tag{font-size:11px;border:1px solid #e2e7d8;border-radius:20px;padding:5px 11px;white-space:nowrap;color:#8a957e}.lesson-body{padding:25px 29px}.callout{background:#f3f6ea;border-left:3px solid #a7bc70;border-radius:0 8px 8px 0;padding:15px 18px;font-size:13px;margin:0 0 23px}.callout strong{color:var(--green)}.question{padding:18px 0;border-bottom:1px solid #edf0e7}.question:first-of-type{padding-top:0}.question h3{font-size:14px;font-weight:500;margin:0 0 12px}.q-index{color:#94a87c;margin-right:9px;font-size:11px}.options{display:flex;gap:10px}.option{border:1px solid #dfe5d6;color:#63715a;background:#fff;padding:8px 20px;border-radius:7px;font-size:12px}.option:hover,.option.selected{background:#edf3df;border-color:#a9bf79;color:var(--green)}.feedback{font-size:12px;margin:12px 0 0;padding:12px 15px;background:#f4f6ee;border-radius:7px}.feedback:empty{display:none}.feedback.correct{color:#356b4d}.feedback.wrong{color:#885e35;background:#fbf3e6}.bottom-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 29px;background:#fbfcf8;border-top:1px solid #edf0e7;font-size:11px;color:var(--muted)}.primary{background:var(--green);border:1px solid var(--green);color:white;border-radius:7px;padding:10px 21px;font-size:12px}.primary:hover{background:#224e3a}.primary:disabled{opacity:.4;cursor:not-allowed}.secondary{background:#fff;border:1px solid #d6dfca;border-radius:7px;padding:9px 16px;color:var(--green);font-size:12px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px}label.field{display:block;font-size:12px;font-weight:600;margin-bottom:16px}input,textarea,select{width:100%;margin-top:6px;border:1px solid #dce3d4;border-radius:7px;padding:10px 12px;color:var(--ink);background:#fcfdf9;font-size:13px;line-height:1.7}textarea{min-height:90px;resize:vertical}input:focus,textarea:focus,select:focus{outline:2px solid #abc27f;outline-offset:1px}.output-panel{background:#f4f6ed;border:1px solid #e2e8d5;border-radius:10px;padding:22px;align-self:start}.output-panel h3{margin:0 0 12px;font-size:15px}.output-panel p{white-space:pre-wrap;font-size:13px;line-height:2}.hint{font-size:11px;color:var(--muted)}.button-row{display:flex;gap:9px;flex-wrap:wrap}.tool-link{display:inline-flex;align-items:center;justify-content:space-between;gap:25px;background:#f2f5ea;border:1px solid #dce5cd;border-radius:9px;text-decoration:none;padding:15px 20px;font-size:14px;font-weight:600}.tool-link small{font-size:10px;font-weight:400;display:block}.tool-links{display:flex;gap:15px;margin:0 0 22px}.sample{margin-top:18px;padding:14px 17px;background:#fbf7ec;border-radius:8px;font-size:12px}.sample summary{cursor:pointer;font-weight:600}.sample h4{margin-bottom:5px}.check-row{display:flex;align-items:start;gap:10px;font-size:13px;margin:12px 0}.check-row input{width:16px;margin-top:5px;accent-color:var(--green)}.source{background:#fafbf7;padding:18px;border:1px solid var(--line);border-radius:10px;margin-bottom:15px}.source h3{font-size:14px;margin:0 0 10px}.source .grid2{gap:13px}.source label{margin-bottom:10px}.source textarea{min-height:70px}.report{border:1px solid #d8e0ca;border-radius:10px;padding:24px;background:#fcfdf8;margin-top:20px;white-space:pre-wrap;font-size:13px}.report h3{margin:0 0 14px;font-size:19px}.danger{color:#965d49;border:1px solid #e4cfc4;border-radius:6px;background:white;font-size:12px;padding:10px;margin-right:12px}footer{display:flex;justify-content:space-between;font-size:10px;color:#98a18e;padding:27px 0 8px}dialog{border:1px solid #d5dfc8;border-radius:16px;max-width:620px;color:var(--ink);padding:30px;font-size:14px;line-height:1.9}dialog::backdrop{background:#24392d77}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#263f32;color:white;padding:10px 24px;border-radius:9px;font-size:12px;display:none;z-index:10}.print-only{display:none}@media(min-width:1500px){main{padding-top:40px}.hero{padding-top:40px;padding-bottom:40px}}@media(max-width:1050px){.sidebar{width:210px;padding:27px 15px}.workspace{margin-left:210px}main{padding:25px}header{padding:0 25px}.hero{grid-template-columns:1.2fr 1fr}h1{font-size:36px}.orbit-art{height:225px}.hero-tags{gap:12px}.brand{font-size:16px}.search-doodle{left:0}.float-chip{font-size:9px}.lesson-body,.lesson-top{padding:22px}}@media(max-width:760px){.sidebar{position:static;width:100%;padding:18px 20px;border-right:0;border-bottom:1px solid var(--line)}.brand small,.course-label,.sidebar-bottom{display:none}nav{grid-template-columns:repeat(5,1fr);gap:5px;margin-top:17px}.nav-item{padding:7px 2px;display:block;text-align:center}.nav-number{margin:auto auto 5px}.nav-item strong{font-size:10px}.nav-item small{display:none}.workspace{margin:0}header{height:58px;font-size:10px;padding:0 18px}.header-slash{margin:0 5px}.quiet{font-size:10px;padding:6px}main{padding:22px 17px}.hero{grid-template-columns:1fr;padding:22px 0}.orbit-art{display:none}h1{font-size:39px}.hero p{font-size:12px}.progress-card{padding:15px}.progress-card span{font-size:10px}.grid2{grid-template-columns:1fr}.lesson-top{padding:19px}.lesson-top h2{font-size:20px}.lesson-body{padding:20px}.bottom-row{padding:17px;flex-wrap:wrap}.time-tag{font-size:10px}.tool-links{flex-direction:column}.tool-link{font-size:13px}.hero-tags{font-size:10px}.options{flex-wrap:wrap}footer{font-size:9px;gap:15px}.desktop{display:none}}@media print{body{background:white}.sidebar,header,.hero,.eyebrow,.progress-card,.bottom-row,footer,dialog,#toast{display:none!important}.workspace{margin:0}main{max-width:none;padding:0}.lesson-card{border:0}button,.tool-links,details{display:none!important}.print-only{display:block!important;white-space:pre-wrap}#lesson{display:none}.print-only h1{font-size:24px}.print-only article{font-size:12px;line-height:1.8;white-space:pre-wrap}input,textarea{border:0} }
#fireworks{display:none;position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:60;background:#12253525}#celebrationBadge{position:fixed;left:50%;top:30%;transform:translate(-50%,-50%);z-index:61;pointer-events:none;background:#fff8dc;color:#31573d;border:4px solid #e8c954;border-radius:24px;padding:22px 34px;text-align:center;font-size:clamp(22px,4vw,48px);font-weight:900;box-shadow:0 14px 60px #293d3450;opacity:0;max-width:90vw;width:max-content}#celebrationBadge.show{opacity:1;animation:celebrate-pop .55s cubic-bezier(.2,1.5,.5,1)}.celebration-controls{position:fixed;right:20px;bottom:20px;z-index:62;display:flex;gap:8px}.celebration-controls button{background:#fff;box-shadow:0 3px 18px #263f3218}.celebration-controls [hidden]{display:none}@keyframes celebrate-pop{0%{opacity:0;transform:translate(-50%,-50%) scale(.3) rotate(-12deg)}70%{transform:translate(-50%,-50%) scale(1.12) rotate(3deg)}100%{opacity:1;transform:translate(-50%,-50%) scale(1) rotate(0)}}@media(prefers-reduced-motion:reduce){#celebrationBadge.show{animation:none}}@media(max-width:760px){.celebration-controls{right:10px;bottom:10px}#celebrationBadge{padding:18px 15px}}@media print{#fireworks,#celebrationBadge,.celebration-controls{display:none!important}}
/* Grade-five picture guides and readable activity text. */
.robot-scene{position:relative;text-align:center;max-width:360px;width:100%;justify-self:center;padding-bottom:20px}.robot-scene svg{display:block;width:100%;height:auto}.robot-bubble{display:inline-block;background:white;border:2px solid #dbe5c7;padding:8px 18px;border-radius:20px;font-size:14px;font-weight:600;transform:rotate(-3deg)}.visual-guide{display:flex;align-items:center;gap:20px;background:#faf7ed;border:1px solid #eee5c9;border-radius:16px;padding:15px 20px;margin-bottom:20px}.mission-mascot{font-size:56px;line-height:1.2}.picture-steps{display:flex;align-items:center;justify-content:space-around;flex:1;gap:12px}.picture-steps>div{text-align:center}.picture-steps>div>span{display:block;font-size:28px;line-height:1.5}.picture-steps strong{font-size:14px;font-weight:600;white-space:nowrap}.step-arrow{color:#b9c78e;font-size:20px}.hero p{font-size:16px}.hero-tags{font-size:14px}.question h3{font-size:17px}.option{font-size:15px;min-height:44px;min-width:85px}.feedback,.callout{font-size:15px}.lesson-top p{font-size:14px}label.field{font-size:15px}input,textarea{font-size:16px}.check-row{font-size:15px}.hint{font-size:13px}.output-panel p{font-size:15px}.primary,.secondary{font-size:14px;min-height:43px}.report summary{cursor:pointer;font-weight:700;font-size:16px}.report #reportPreview{padding-top:20px}.sample{font-size:14px}.hero{padding-top:20px;padding-bottom:24px}.lesson-body .callout{margin-bottom:20px}.robot-scene svg text{fill:#8ba85e}@media(max-width:760px){.hero{grid-template-columns:1fr 120px;gap:8px}h1{font-size:32px}.hero p{font-size:14px}.robot-bubble{font-size:11px;padding:6px 9px}.hero-tags{gap:8px;font-size:12px;flex-wrap:wrap}.visual-guide{padding:13px 10px;gap:8px}.mission-mascot{display:none}.picture-steps{gap:5px}.picture-steps strong{font-size:12px}.step-arrow{font-size:15px}.question h3{font-size:16px}.hero .pill{font-size:10px}.lesson-body{padding:18px}.robot-scene{padding:0}.hero p br{display:none}.output-panel{padding:18px}}@media(max-width:390px){.hero{grid-template-columns:1fr 95px}h1{font-size:28px}.robot-bubble{font-size:10px}}@media print{.robot-scene,.visual-guide{display:none!important}}
.choice-list{display:grid;gap:10px}.choice-card{width:100%;display:flex;align-items:center;gap:12px;text-align:left;padding:13px 16px;min-height:50px;font-size:16px}.choice-letter{display:grid;place-items:center;width:28px;height:28px;background:#f0f4e5;border-radius:8px;font-size:13px;font-weight:700;flex-shrink:0}.selected .choice-letter{background:#32684f;color:white}.answer-pair{gap:14px;margin-bottom:10px}.answer-tile{border:2px solid #e3eacb;border-radius:15px;background:#fbfcee;padding:18px 22px}.answer-tile:nth-child(2){background:#eef6ee;border-color:#d9e8d5}.answer-tile>span{font-size:35px}.answer-tile h3{display:inline;margin-left:10px;font-size:18px}.answer-tile p{font-size:16px;margin-bottom:0}.source-clue{border:2px dashed #c7d6ac;background:#fcfaed;border-radius:16px;padding:18px;display:flex;gap:17px}.source-clue h3{margin:0 0 10px;font-size:18px}.source-clue p{font-size:16px;margin:6px 0}.clue-icon{font-size:40px}.mini-fill{margin:25px 0}.mini-fill>label{font-size:16px;font-weight:600}.mini-fill>.output-panel{margin-top:18px}.hero{padding-top:12px;padding-bottom:18px}.hero h1{font-size:38px}.robot-scene{max-width:240px}.hero p{margin:10px 0}.question{padding:20px 0}.lesson-top p{margin-top:5px}@media(min-width:761px){.choice-list{max-width:720px}}@media(max-width:760px){.hero h1{font-size:29px}.source-clue{padding:14px;gap:10px}.clue-icon{font-size:28px}.source-clue p{font-size:14px}.choice-card{font-size:15px}.answer-tile{padding:15px}.answer-tile p{font-size:15px}}