@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600;700;800;900&family=Outfit:wght@400;500;600;700;800&display=swap');
:root{--paper:#f8f9f6;--ink:#233b40;--muted:#7a888b;--line:#e4e9e5;--teal:#277367;--mint:#e8f3ec;--nav:#173d43;--white:#fff;--shadow:0 5px 25px #143b3b05}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.65 'Noto Sans TC',-apple-system,BlinkMacSystemFont,'PingFang TC',sans-serif}button,input,select,textarea{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer;color:inherit}button{transition:background .18s,transform .18s,border-color .18s}button:hover{filter:brightness(.98)}button:active{transform:translateY(1px)}button:disabled{cursor:not-allowed;opacity:.5}a{color:inherit}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,canvas:focus-visible,textarea:focus-visible{outline:3px solid #4b9cca;outline-offset:3px}h1,h2,h3,p{margin:0}svg{flex-shrink:0}.icon{width:20px;height:20px;display:inline-block;vertical-align:middle;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.skip{position:fixed;top:-60px;left:15px;z-index:20;padding:10px;background:#fff}.skip:focus{top:10px}.app-shell{display:flex;min-height:100vh}.sidebar{width:226px;background:var(--nav);color:#bcd0ce;position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;padding:33px 18px 15px;z-index:5}.brand{display:flex;align-items:center;gap:12px;color:white;text-decoration:none;padding:0 10px 35px}.brand span{font-size:21px;letter-spacing:2px;font-weight:700;line-height:1.4}.brand small{display:block;font-family:Outfit,sans-serif;font-size:12px;font-weight:400;letter-spacing:1.2px;margin-top:2px;color:#bad0cd}.workspace-label{font-size:10px;color:#87a7a5;padding:5px 14px 15px;letter-spacing:1.2px;display:flex;justify-content:space-between}.nav-btn{display:flex;align-items:center;width:100%;gap:13px;border:0;background:transparent;color:#b7ceca;padding:13px 14px;margin-bottom:7px;border-radius:9px;text-align:left;font-weight:500;font-size:13px}.nav-btn .icon{width:19px;height:19px}.nav-btn.active{background:#edf5ed;color:#214b45}.nav-btn:hover:not(.active){background:#ffffff0c}.nav-tag{margin-left:auto;background:#ffffff12;border-radius:4px;font:10px Outfit,sans-serif;padding:3px 5px}.active .nav-tag{background:#d8e7da;color:#456d60}.sidebar-bottom{margin-top:auto;padding-top:35px}.planet-card{padding:20px 12px 21px;border:1px solid #ffffff13;border-radius:11px;position:relative;overflow:hidden}.planet-card strong{display:block;font-size:12px;color:#e3ede5;margin-top:68px;font-weight:500}.planet-card p{font-size:11px;line-height:1.9;margin-top:7px;color:#93b3af}.planet-drawing{position:absolute;top:21px;left:31px;transform:rotate(-20deg)}.planet-drawing span{width:57px;height:57px;background:linear-gradient(135deg,#b3d3b9,#78a89e);display:block;border-radius:50%;box-shadow:inset -9px -5px 15px #346c6445}.planet-drawing:after{content:'';position:absolute;width:90px;height:20px;left:-17px;top:20px;border:5px solid #e2c092;border-top:0;border-radius:50%;transform:rotate(-10deg)}.planet-drawing i{position:absolute;color:#e6c48e;top:-4px;left:96px;font-size:17px}.blueprint-nav{display:flex;align-items:center;gap:7px;color:#adc6c2;background:none;border:none;font-size:10px;width:100%;padding:19px 3px 15px}.blueprint-nav .icon{width:15px}.blueprint-nav>span:last-child{margin-left:auto}.sidebar-foot{border-top:1px solid #ffffff12;padding:14px 3px 0;font-size:9px;color:#83a6a1;display:flex;align-items:center;gap:6px}.sidebar-foot>span:last-child{margin-left:auto;font-family:Outfit}.status-dot{width:5px;height:5px;border-radius:50%;display:inline-block;background:#9ccaa6}.main-shell{margin-left:226px;min-width:0;flex:1}.topbar{height:78px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:0 36px;background:#ffffff90;gap:15px}.breadcrumb{display:flex;align-items:center;gap:12px;color:#899693;font-size:11px}.breadcrumb .icon{width:16px}.breadcrumb strong{color:#3d5554;font-weight:500}.crumb-slash{color:#d2d9d3;margin:0 2px}.topbar-actions{display:flex;align-items:center;gap:12px;font-size:11px;white-space:nowrap}.demo-badge{border:1px solid #e0e4d8;color:#8a926e;padding:3px 9px;border-radius:4px;font-size:9px}.role-switch{padding:3px;background:#edf0ec;border-radius:7px;display:flex}.role-switch button{background:none;border:0;border-radius:5px;padding:5px 15px;font-size:11px;color:#85938b}.role-switch button.active{background:white;box-shadow:0 1px 4px #1d393710;color:#325950}.top-divider{height:23px;width:1px;background:var(--line);margin:0 2px}.avatar{width:31px;height:31px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:#e5ebdb;font-size:11px;color:#667850;border:3px solid white;outline:1px solid #e4e8df}main{max-width:1620px;margin:0 auto;padding:30px 36px 20px;outline:none}.eyebrow{font:11px/1.4 Outfit,sans-serif;letter-spacing:2px;color:#5c8a7e;font-weight:500}.page-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:24px}.page-heading h1{font-size:28px;letter-spacing:.5px;font-weight:700;line-height:1.6;margin:5px 0 4px}.page-heading p{font-size:12px;color:var(--muted)}.grade-select{background:white;border:1px solid var(--line);border-radius:7px;padding:10px 30px 10px 13px;color:#526760;font-size:11px;max-width:220px}.welcome-bar{background:#ecf1e8;border:1px solid #e1e8db;border-radius:11px;padding:15px 22px;display:flex;align-items:center;gap:14px;margin-bottom:24px}.welcome-icon{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:10px;background:#dce7d5;color:#6b8e64;flex-shrink:0}.welcome-bar strong{font-weight:600;font-size:12px}.welcome-bar p{font-size:10px;color:#84917a;margin-top:1px}.welcome-bar .text-button{margin-left:auto;white-space:nowrap}.text-button{border:none;background:none;display:inline-flex;gap:8px;align-items:center;color:var(--teal);font-size:11px;padding:5px}.lab-layout{display:grid;grid-template-columns:minmax(0,1fr) 302px;gap:22px;align-items:start}.card{background:white;border:1px solid var(--line);border-radius:13px;box-shadow:var(--shadow);overflow:hidden}.card-heading{padding:19px 22px 15px;display:flex;justify-content:space-between;align-items:center}.card-heading h2{font-size:14px;font-weight:600;display:flex;align-items:center;gap:8px}.card-heading p{font-size:10px;color:var(--muted);margin-top:3px}.subtle-label{font-size:9px;color:#89998f;border:1px solid #e5e9e1;border-radius:4px;padding:3px 7px}.shape-tabs{display:flex;gap:5px;margin:0 19px 17px;flex-wrap:wrap}.shape-tab{border:1px solid transparent;background:#f6f8f5;color:#809087;border-radius:7px;display:flex;gap:7px;align-items:center;font-size:10px;padding:8px 12px}.shape-tab.active{background:#eaf4ed;color:#347567;border-color:#b9d4c7}.shape-tab .icon{width:17px;height:17px}.viewport{position:relative;height:350px;background:radial-gradient(ellipse at 55% 38%,#fafdfc 0,#ecf5f2 75%);margin:0 18px;border:1px solid #e4efea;border-radius:10px;overflow:hidden}.viewport canvas{width:100%;height:100%;display:block;touch-action:none;cursor:grab}.viewport canvas:active{cursor:grabbing}.viewport-top{position:absolute;top:15px;left:17px;right:15px;display:flex;align-items:center;justify-content:space-between;pointer-events:none;z-index:1}.viewport-kicker{display:flex;align-items:center;gap:6px;font:10px Outfit,sans-serif;letter-spacing:1.2px;color:#76978e}.live-dot{width:5px;height:5px;border-radius:50%;background:#7aa88d}.view-pill{color:#658679;background:#ffffffc9;font-size:9px;padding:4px 8px;border:1px solid #dce9e1;border-radius:4px}.viewport-help{position:absolute;bottom:12px;left:18px;display:flex;gap:7px;align-items:center;font-size:9px;color:#879d96;pointer-events:none}.viewport-help .icon{width:13px;height:13px}.view-tools{position:absolute;right:13px;bottom:13px;display:flex;gap:4px;z-index:1}.icon-button{display:inline-flex;justify-content:center;align-items:center;background:white;border:1px solid #dfe7e1;width:29px;height:29px;border-radius:6px;color:#6e897e}.icon-button .icon{width:14px;height:14px}.view-tools .icon-button.active{background:#d6e9de;border-color:#b1d0be;color:#38674f}.scene-toolbar{padding:15px 20px;display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid #edf0eb}.mode-switch{display:flex;border:1px solid #e2e8e1;border-radius:6px;padding:3px;gap:3px}.mode-switch button{font-size:10px;border:none;border-radius:4px;padding:5px 10px;display:flex;gap:5px;align-items:center;background:white;color:#8b978c}.mode-switch button.active{background:#edf3eb;color:#397158}.mode-switch .icon{width:14px;height:14px}.toolbar-right{display:flex;align-items:center;gap:7px}.toolbar-right .text-button{font-size:10px}.toolbar-right .icon{width:14px}.dimension-panel{padding:16px 22px 17px}.dimension-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:10px}.dimension-heading 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10px;margin-left:22px;color:#466e5c}.chat-time{font-size:8px;color:#a4ada2;margin-bottom:7px}.tutor-note{font-size:9px;color:#a0a696;display:flex;gap:5px;align-items:center;padding:0 17px 15px}.tutor-note .icon{width:12px}.prompt-chips{display:flex;flex-direction:column;gap:7px;padding:5px 16px 16px}.prompt-chip{background:#fff;border:1px solid #e7eae3;border-radius:6px;text-align:left;display:flex;justify-content:space-between;padding:8px 11px;font-size:10px;color:#778773}.prompt-chip .icon{width:13px;height:13px}.chat-form{display:flex;margin:0 15px 9px;border:1px solid #dfe6dc;border-radius:7px;background:#fff;align-items:center;padding:4px 5px 4px 10px;gap:4px}.chat-form input{border:0;background:none;min-width:0;flex:1;font-size:10px;outline:none;padding:7px 0;color:#496353}.chat-form button{background:#3c7c68;color:#fff;border:none;border-radius:5px;width:28px;height:28px;display:flex;align-items:center;justify-content:center}.chat-form 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p{font-size:10px;color:#91a086;line-height:1.9}.checklist{font-size:11px;color:#7a8d70;line-height:2.2;padding-left:18px}.checklist li{margin:8px 0}.implementation-status{padding:16px 20px;background:#f2eef7;border:1px solid #e4ddec;border-radius:9px;font-size:11px;color:#8b7a9f;line-height:1.9;margin:22px 0}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.form-field{display:flex;flex-direction:column;gap:6px;font-size:11px;color:#87967e}.form-field.full{grid-column:1/-1}.form-field input,.form-field textarea,.form-field select{padding:10px;border-radius:6px;border:1px solid #dfe5d8;background:#fcfdfb;width:100%;color:#426247}.form-field textarea{min-height:80px;resize:vertical}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:22px}.question-card{padding:22px;background:#f5f8f0;border-radius:10px;margin:17px 0}.question-card h3{font-size:15px;margin-bottom:13px}.answer-row{display:flex;gap:10px;align-items:center}.answer-row input{min-width:0;width:100px;border:1px solid #cddbc6;border-radius:7px;padding:10px;font:18px Outfit;background:#fff}.feedback{padding:12px;border-radius:7px;font-size:11px;background:#e7f2e4;color:#68895d;margin-top:14px;line-height:1.9}.feedback.warning{background:#fbefd9;color:#a18a4e}.quiz-progress{font-size:10px;color:#8ea582;margin-top:15px}.answer-option{width:100%;text-align:left;background:white;border:1px solid #dbe3d4;border-radius:7px;padding:11px;margin-top:8px;font-size:12px}.answer-option.selected{background:#e9f4e3;border-color:#98b784}dialog{border:1px solid #dbe3d4;border-radius:15px;padding:30px;max-width:620px;width:calc(100% - 36px);color:var(--ink);box-shadow:0 22px 100px #183d432b}dialog::backdrop{background:#12333355;backdrop-filter:blur(4px)}dialog h2{font-size:21px;margin-bottom:7px}dialog .modal-intro{font-size:11px;color:#8c9b82;margin-bottom:22px;line-height:1.9}.modal-close{position:absolute;right:14px;top:14px;font-size:22px;border:0;background:#f4f6ef;color:#8c9e81}.modal-answer{margin-top:16px}#toast{position:fixed;left:calc(50% + 90px);bottom:28px;transform:translate(-50%,20px);opacity:0;background:#244d44;color:#f1f7ed;padding:12px 24px;border-radius:9px;box-shadow:0 5px 30px #163c4320;font-size:12px;z-index:30;transition:all .2s;pointer-events:none;max-width:calc(100% - 30px);text-align:center}#toast.show{opacity:1;transform:translate(-50%,0)}.inline-controls{display:flex;gap:10px;align-items:center}.inline-controls select{font-size:10px;border:1px solid var(--line);border-radius:6px;padding:8px;background:white}.class-tabs{display:flex;gap:8px}.class-tabs button{padding:6px 12px;border:1px solid #e1e7da;background:#fff;border-radius:6px;font-size:10px;color:#879a7c}.class-tabs .active{background:#eaf3e5;color:#5e8650;border-color:#c8dabe}.class-tasks{margin-top:18px}.class-task{padding:14px 0;border-bottom:1px solid #edf0e6;display:flex;align-items:center;gap:12px}.class-task h3{font-size:11px;font-weight:500}.class-task p{font-size:9px;color:#9aa78d;margin-top:3px}.class-task .soft-badge{margin-left:auto}.saved-task-note{font-size:10px;color:#90a082;margin-top:12px}.unit-toggle{color:#64856c}.welcome-bar.teacher{background:#edf0f7;border-color:#dfe4ef}.welcome-bar.teacher .welcome-icon{background:#dde4f2;color:#8194b6}.welcome-bar.teacher p{color:#949fb1}.teacher-actions{display:flex;gap:8px}.teacher-actions button{white-space:nowrap}.print-only{display:none}
@media(min-width:1500px){main{padding:35px 48px}.topbar{padding:0 48px}.viewport{height:410px}.lab-layout{grid-template-columns:minmax(0,1fr) 335px}.tutor-card{min-height:626px}.chat-scroll{max-height:410px}.page-heading h1{font-size:32px}}
@media(max-width:1180px){.sidebar{width:195px;padding:30px 13px 15px}.main-shell{margin-left:195px}.brand{gap:9px;padding-left:7px}.brand span{font-size:19px}.brand svg{width:29px}main{padding:26px 25px 15px}.topbar{padding:0 25px}.lab-layout{grid-template-columns:minmax(0,1fr) 270px;gap:17px}.shape-tab{padding:7px 8px}.shape-tabs{gap:4px}.scene-toolbar{padding:13px 17px}.toolbar-right .text-button{font-size:9px}.lesson-card{padding:13px;gap:10px}.lesson-art{width:43px;height:43px}.lesson-art .icon{width:28px}.lesson-card h3{font-size:10px}.lesson-card p{font-size:8px}.page-heading h1{font-size:25px}.sliders{gap:15px}.fact{padding:8px}.site-footer{padding:18px 25px}.tutor-card{min-height:560px}.breadcrumb{gap:8px}.topbar-actions{gap:9px}}
@media(max-width:1000px){.sidebar{width:180px;padding:27px 11px 15px}.main-shell{margin-left:180px}.brand span{font-size:17px}.brand small{font-size:10px}.workspace-label{font-size:9px}.nav-btn{font-size:11px;gap:10px}.lab-layout{grid-template-columns:1fr}.side-column{display:grid;grid-template-columns:1.7fr 1fr;gap:18px;align-items:start}.tutor-card{min-height:0}.chat-scroll{max-height:200px}.goal-card{margin-top:0}.prompt-chips{flex-direction:row;flex-wrap:wrap}.prompt-chip{font-size:9px}.tutor-note{display:none}.chat-form{margin-top:4px}.topbar .demo-badge{display:none}.breadcrumb>span:nth-child(2){display:none}.lesson-grid{gap:10px}.lesson-card p{font-size:8px}.lesson-card{gap:8px}.lesson-art{width:36px;height:40px}.lesson-art .icon{width:24px}.metric-grid{gap:12px}.dashboard-grid{grid-template-columns:1fr}.task-list{gap:13px}.task-card{padding:17px}.task-card h2{font-size:14px}.blueprint-hero{padding:25px}.blueprint-hero h2{font-size:20px}.roadmap-item{padding:17px}.site-footer{font-size:7px}}
@media(max-width:760px){.app-shell{display:block}.sidebar{position:sticky;top:0;inset:auto;width:100%;height:auto;flex-direction:row;align-items:center;padding:11px 15px;gap:20px}.brand{padding:0;gap:8px}.brand svg{width:24px;height:28px}.brand span{font-size:14px;letter-spacing:1px}.brand small{font-size:8px;margin-top:0}.workspace-label,.sidebar-bottom{display:none}.sidebar nav{display:flex;gap:3px;margin-left:auto}.nav-btn{padding:8px 10px;margin:0;font-size:10px;gap:6px}.nav-btn .icon{width:16px;height:16px}.nav-tag{display:none}.nav-btn[data-page=progress]{display:none}.main-shell{margin-left:0}.topbar{height:59px;padding:0 20px}.topbar-actions{font-size:10px;gap:8px}.top-divider{display:none}.topbar #profile-name{display:none}.role-switch button{padding:4px 13px}.avatar{width:27px;height:27px}main{padding:24px 20px 12px}.page-heading{align-items:flex-start;margin-bottom:20px;gap:10px}.page-heading h1{font-size:24px;letter-spacing:0}.page-heading p{font-size:11px}.eyebrow{font-size:9px}.grade-select{max-width:145px;padding:9px 7px;font-size:9px;margin-top:7px}.welcome-bar{padding:12px 14px;margin-bottom:20px;gap:10px}.welcome-bar strong{font-size:11px}.welcome-bar p{font-size:9px}.welcome-bar .text-button{font-size:10px}.welcome-icon{width:31px;height:31px}.side-column{display:block}.goal-card{display:none}.viewport{height:350px}.lab-layout{gap:18px}.tutor-card{min-height:0}.lesson-grid{grid-template-columns:1fr}.lesson-card{gap:15px;padding:14px}.lesson-art{width:45px;height:45px}.lesson-card h3{font-size:12px}.lesson-card p{font-size:10px}.related-section{margin-top:22px}.site-footer{flex-direction:column;gap:3px;padding:15px 20px 20px;font-size:8px}.fact-row{gap:6px}.fact strong{font-size:18px}.fact small{font-size:8px}.scene-toolbar{gap:5px}.toolbar-right .text-button{font-size:9px}.shape-tabs{gap:4px}.shape-tab{padding:7px 9px;font-size:10px}.metric-grid{grid-template-columns:1fr 1fr;gap:10px}.metric{padding:15px}.metric strong{font-size:25px}.teacher-actions{flex-direction:column;gap:6px}.teacher-actions button{font-size:9px;padding:7px 10px}.task-list{grid-template-columns:1fr}.task-card h2{font-size:17px}.task-visual{height:95px}.task-card{padding:23px}.task-card p{margin-bottom:15px}.progress-hero{padding:22px}.progress-hero h2{font-size:18px}.progress-big{font-size:40px}.blueprint-grid{grid-template-columns:1fr}.blueprint-hero{display:block;padding:24px}.blueprint-hero .primary{margin-top:20px}.roadmap{grid-template-columns:1fr}.roadmap-item{padding:23px}.roadmap-item h3{margin:8px 0}.roadmap-item p{font-size:12px}.implementation-status{font-size:10px}.form-grid{grid-template-columns:1fr}.form-field.full{grid-column:auto}dialog{padding:26px 22px}.panel-pad{padding:20px}.panel-title{font-size:13px}#toast{left:50%;font-size:11px;width:max-content}.mode-switch button{font-size:9px;padding:5px 8px}.blueprint-mobile{display:inline-flex}.topbar-actions .avatar{display:none}}
@media(max-width:430px){.sidebar{gap:10px;padding:11px 12px}.nav-btn{padding:8px}.nav-btn .nav-label{font-size:9px}.nav-btn .icon{width:15px}.brand span{font-size:12px}.brand small{font-size:7px}.brand svg{width:21px}.page-heading h1{font-size:22px}.page-heading{display:block}.grade-select{margin-top:12px;max-width:220px}.welcome-bar .text-button{font-size:9px}.welcome-bar p{max-width:210px}.viewport{height:300px;margin:0 12px}.card-heading{padding:17px}.shape-tabs{margin:0 13px 14px}.shape-tab{font-size:9px;gap:5px;padding:7px}.shape-tab .icon{width:14px}.sliders{gap:12px}.dimension-panel{padding:15px 17px}.fact-row{padding:0 14px 16px}.scene-toolbar{padding:12px 14px}.toolbar-right{gap:0}.toolbar-right .text-button{font-size:8px;padding:4px}.toolbar-right .icon{width:12px}.view-tools .icon-button{width:26px;height:26px}.viewport-help{font-size:8px;left:12px}.view-tools{right:9px;gap:3px}.welcome-bar{gap:8px}.welcome-icon{display:none}.lesson-card h3{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,.site-footer,button,.primary,.secondary{display:none!important}.main-shell{margin:0}main{padding:10px;max-width:none}.card,.roadmap-item{break-inside:avoid;box-shadow:none}.blueprint-hero{background:#f2f5ed;color:#224d39}.blueprint-hero p{color:#63765a}.blueprint-grid{display:block}.blueprint-grid>.card{margin-bottom:15px}.print-only{display:block}}

/* Keep teaching text legible for students and classroom display. */
.chat-bubble{font-size:12px;line-height:1.95}.prompt-chip{font-size:11px}.chat-form input{font-size:11px}.tutor-heading p{font-size:10px}.ai-disclaimer{font-size:9px}.shape-tab{font-size:11px}.slider-top{font-size:11px}.dimension-heading{font-size:11px}.dimension-heading small{font-size:10px}.fact small{font-size:10px}.view-pill,.viewport-help{font-size:10px}.goal-card h3{font-size:12px}.goal-card p{font-size:10px}.draft-details{font-size:11px;color:#7b9575;margin-top:8px;max-width:600px}.draft-details summary{cursor:pointer}.draft-details p{font-size:11px;white-space:pre-line;line-height:1.9;padding:8px 0}.chat-scroll{max-height:390px}.tutor-card{min-height:610px}
@media(max-width:1180px){.shape-tab{font-size:10px;padding:7px 8px}}
@media(max-width:1000px){.tutor-card{min-height:0}.chat-scroll{max-height:270px}.side-column{grid-template-columns:1fr}.goal-card{display:none}}
@media(max-width:430px){.shape-tab{font-size:10px}.shape-tabs{column-gap:4px;row-gap:6px}.shape-tab{padding:6px}.fact small{font-size:9px}.viewport-help{font-size:8px}}

@media(max-width:760px){.sidebar{inset:auto;top:0;z-index:6}}