@charset "UTF-8";
:root{--bg:#f6f7f2;--paper:#fffefb;--ink:#293c34;--muted:#788179;--line:#e1e5db;--green:#375c46;--green-light:#edf2e6;--orange:#d57751;--radius:20px;font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--bg);font-size:14px;line-height:1.6}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a{touch-action:manipulation}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.46}button[hidden]{display:none}button{border:0;background:none}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:650;line-height:1.4}button,a,input{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,[role=button]:focus-visible{outline:3px solid #d57751}.icon{width:21px;height:21px;flex-shrink:0;vertical-align:middle}.skip{position:fixed;z-index:20;top:-60px;left:15px;background:var(--green);color:white;padding:10px 20px}.skip:focus{top:12px}#main:focus{outline:none}#main:fullscreen{overflow:auto;background:var(--bg);padding:30px;max-width:none;width:100%;height:100%}
.sidebar{width:222px;position:fixed;inset:0 auto 0 0;background:#fdfdf9;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:35px 22px;z-index:5}.brand{display:flex;align-items:center;gap:10px;font-family:system-ui,sans-serif;font-size:24px;font-weight:750;letter-spacing:-1px;line-height:1.2}.brand small{display:block;font-family:"PingFang SC",sans-serif;font-size:10px;letter-spacing:1.8px;font-weight:400;color:#828a7e;margin-top:9px}.brand-mark{display:flex;align-items:center;justify-content:center;width:39px;height:44px;border-radius:15px 15px 15px 4px;background:#dce8c7;font-size:36px;font-weight:800;position:relative;padding-bottom:4px;color:#42613d}.brand-mark span{position:absolute;color:#dc8259;font-size:40px;right:1px;top:-12px}.sidebar-label{font-size:11px;letter-spacing:1.5px;color:#90968b;margin:52px 13px 14px}.side-item{display:flex;align-items:center;gap:12px;padding:13px;border-radius:10px;font-weight:600}.side-item.active{background:#e9efdf;color:#405b38}.side-item .icon:last-child{width:16px;margin-left:auto}.course-note{margin:30px 13px;color:var(--muted);font-size:12px}.course-note>*{display:block}.tiny-label{font-size:10px;letter-spacing:1.5px;margin-bottom:12px}.course-note strong{font-size:14px;color:#56654c;margin-bottom:5px;font-weight:600}.course-line{height:1px;background:var(--line);margin:23px 0}.course-note p{line-height:2.1;color:#8e9687}.sidebar-bottom{margin-top:auto;border-top:1px solid var(--line);padding:24px 10px 0;display:flex;gap:12px;align-items:center;color:#9ca98e}.sidebar-bottom p{font-size:11px;line-height:1.9}.sidebar-bottom strong{font-weight:400;color:#75836a}.sidebar-bottom .icon{width:28px;height:28px}
.workspace{margin-left:222px}.topbar{height:85px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:24px;padding:0 43px;background:#fdfdf980}.breadcrumbs{font-size:12px;color:#6e796e;flex:1}.breadcrumbs span{margin:0 13px;color:#b9c0b0}.mode-switch{display:flex;padding:4px;border:1px solid #e4e7de;border-radius:11px;background:#ecefe6;gap:3px}.mode-switch a{padding:6px 23px;border-radius:7px;color:#76806d;font-size:12px}.mode-switch a.selected{background:#fffefb;color:#375c46;box-shadow:0 2px 5px #2839230c;font-weight:650}.visitor{display:flex;gap:9px;align-items:center;color:#7e8779;font-size:11px}.avatar{background:#e7eddc;border-radius:50%;width:31px;height:31px;display:grid;place-items:center;font-size:12px;color:#5f7550}main{max-width:1280px;margin:0 auto;padding:39px 43px 24px}.eyebrow{display:block;font-family:system-ui,sans-serif;color:#8c947f;font-weight:600;font-size:10px;letter-spacing:2.1px;margin-bottom:11px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:27px}h1{font-size:28px;letter-spacing:-.6px}.page-heading p,.activity-title p{margin-top:9px;font-size:12px;color:var(--muted)}.edition-tag{font-size:11px;border:1px solid #dce2d3;border-radius:8px;padding:8px 12px;white-space:nowrap;color:#78866a;background:#fafbf6}
.hero{min-height:325px;background:#e9eedc;border-radius:var(--radius);display:flex;align-items:center;position:relative;overflow:hidden;border:1px solid #e0e7d1;padding:30px 40px;gap:8px}.hero-copy{position:relative;z-index:1;min-width:235px;flex:1}.pill{border:1px solid #c8d4b2;border-radius:20px;padding:5px 10px;font-size:10px;color:#62764b;letter-spacing:1px}.pill span{padding:0 4px}.hero h2{font-size:37px;letter-spacing:1px;line-height:1.4;margin:20px 0 12px;font-weight:650}.hero-copy p{font-size:12px;line-height:1.9;color:#7c896b;margin-bottom:23px}.button{background:var(--green);border:1px solid transparent;color:white;border-radius:10px;padding:11px 19px;display:inline-flex;align-items:center;justify-content:center;gap:13px;font-weight:550;font-size:13px;min-height:44px;transition:background .15s,transform .15s}.button:hover:not(:disabled){background:#284c38;transform:translateY(-1px)}.button.secondary{background:#f7f8f2;border-color:#dce2d4;color:#526647}.button.secondary:hover{background:#edf1e5}.button .icon{width:17px;height:17px}.hero-caption{font-size:10px;color:#8a9579;display:block;margin-top:12px;letter-spacing:.4px}.garden-art{width:54%;max-width:480px;margin-right:-11px}.catalog-section{margin-top:34px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px}.section-heading h2{font-size:18px;font-weight:600}.section-heading h2 span{font-family:system-ui,sans-serif;font-size:12px;color:#a2ad92;margin-left:12px;vertical-align:middle}.section-heading p{font-size:11px;color:#929a8c;margin-top:5px}.section-heading>span{font-size:11px;color:#8e9887}.status-key{white-space:nowrap;display:flex;align-items:center;gap:7px}.status-key i,.live-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#83a16b}.unit-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.unit-card{border:1px solid #e1e5db;border-radius:14px;background:#fffefa;padding:18px;display:flex;flex-direction:column;min-height:195px;transition:transform .2s,box-shadow .2s}.unit-card.available{border-color:#9cad87;background:#f5f8eb;box-shadow:0 3px 10px #3f4c2610}.unit-card.available:hover{transform:translateY(-4px);box-shadow:0 8px 20px #3f4c2618}.unit-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:17px}.unit-art{border-radius:11px;height:44px;min-width:47px;display:grid;place-items:center;font-size:23px;letter-spacing:-2px;font-family:system-ui,sans-serif;font-weight:400}.unit-art.peach{background:#faece1;color:#cc9b73}.unit-art.lavender{background:#eeebf6;color:#a195bb}.unit-art.blue{background:#e8eff2;color:#80a2ae}.unit-art.yellow{background:#f6f0d9;color:#b9a553}.unit-art.mint{background:#e1eccf;color:#6b874b}.unit-number{font-family:system-ui,sans-serif;font-size:12px;letter-spacing:1px;color:#b1b7a8}.unit-card h3{font-size:13px;font-weight:600;margin-bottom:6px;letter-spacing:.1px}.unit-card>p{font-size:10px;color:#949c8e}.unit-card-bottom{border-top:1px solid #edf0e7;margin-top:18px;padding-top:11px;display:flex;justify-content:space-between;align-items:center;color:#a0a793;font-size:10px}.unit-card.available .unit-card-bottom{color:#69804f;border-color:#dee6cf}.unit-card-bottom .icon{width:15px;height:15px}.soon-dot{letter-spacing:2px}.gentle-note{margin-top:25px;background:#eef0e8;border-radius:11px;display:flex;align-items:center;gap:11px;padding:15px 18px;color:#8c9780;font-size:11px}.gentle-note .icon{color:#a6b18b}.gentle-note span:last-child{margin-left:auto;font-size:10px;color:#a2ab98}.footer{max-width:1280px;margin:0 auto;padding:10px 43px 28px;display:flex;justify-content:space-between;gap:16px;font-size:9px;letter-spacing:.4px;color:#a4ad99}
.back-link{font-size:12px;color:#7e8b71;display:inline-block;margin-bottom:23px}.back-link:hover{color:var(--green)}.unit-heading{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:7px 0 30px;margin-bottom:30px}.unit-heading h1{font-size:52px;line-height:1.2;margin:8px 0 15px}.heading-dot{color:var(--orange)}.unit-heading p{color:#818c78;font-size:13px}.unit-stamp{width:118px;height:118px;border:1px solid #c1ceac;background:#eaf0df;border-radius:50%;text-align:center;display:flex;flex-direction:column;justify-content:center;color:#6f8555;transform:rotate(10deg);line-height:1.6;font-size:15px}.unit-stamp strong{font-size:19px}.unit-stamp span{font-size:8px;letter-spacing:2px;margin-top:6px}.unit-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:27px}.lesson-list{display:grid;gap:14px}.lesson{display:flex;align-items:center;gap:18px;padding:23px;background:var(--paper);border:1px solid #dce3d1;border-radius:14px}.lesson-number{font-size:28px;color:#aab996;font-family:system-ui,sans-serif;font-weight:300}.lesson>div{flex:1}.lesson h3{font-size:16px}.lesson p{font-size:11px;color:#85907c;margin:5px 0 8px}.lesson-time{font-size:10px;color:#a0aa93}.lesson.pending{background:#f5f6f0;border-color:#e6e9df}.lesson.pending h3{color:#8a9480}.lesson .button{padding:9px 13px;font-size:12px;white-space:nowrap}.pending-tag{font-size:10px;color:#a3ad98;white-space:nowrap}.learning-note{align-self:start;background:#edf1e4;border:1px solid #e3e9d8;border-radius:16px;padding:25px;color:#6f7d60}.note-icon{display:flex;width:40px;height:40px;align-items:center;justify-content:center;background:#e1e9d3;border-radius:12px;margin-bottom:20px;color:#91a372}.learning-note h3{font-size:15px;color:#596d4a;margin-bottom:12px}.learning-note p{font-size:12px;line-height:2;white-space:pre-line;margin-bottom:12px}.learning-note strong{display:block;font-size:12px;margin-bottom:8px;font-weight:600}hr{border:0;border-top:1px solid #dbe2d1;margin:23px 0}.small-note{font-size:10px;color:#8e9b7d}.text-link{font-size:12px;display:inline-flex;gap:8px;align-items:center;color:#6e8558;padding:8px 0}.text-link:hover{color:#355e3b}.text-link .icon{width:15px}.completed-label{font-size:10px;font-weight:400;color:#65874e;background:#e6efd9;padding:4px 7px;border-radius:5px;margin-left:7px}
.activity-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:7px;gap:10px}.activity-top .back-link{margin:0}.activity-tools{display:flex;gap:15px;align-items:center;font-size:11px;color:#8a987b}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border:1px solid #dce4d2;border-radius:9px;background:#fffef9;color:#798c65}.icon-button:hover{background:#eaf0e0}.activity-title{margin:20px 0 27px}.activity-title h1{font-size:29px}.activity-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:22px}.board{background:#fffef9;border:1px solid #dce3d2;border-radius:18px;overflow:hidden;padding:22px}.board-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:11px;color:#536c45;margin-bottom:10px}.board-heading>span:last-child{font-size:10px;color:#94a185}.live-dot{margin-right:7px}.math-scene{width:100%;display:block;max-height:420px;aspect-ratio:520/350;user-select:none}.edge{cursor:pointer}.edge-hit{fill:transparent;stroke:none}.edge-line{fill:none;stroke:#739660;stroke-width:5px;stroke-linecap:round;pointer-events:none;transition:stroke .2s}.edge:hover .edge-line,.edge:focus-visible .edge-line{stroke:#c88b46;stroke-width:7px}.edge.traced .edge-line{stroke:#d57751;stroke-width:7px}.edge.reference-edge{cursor:default}.edge.reference-edge:hover .edge-line{stroke:#739660;stroke-width:5px}.edge text{pointer-events:none}.board-caption{display:flex;align-items:center;gap:8px;color:#8d9a7e;font-size:11px;padding:12px 10px}.legend-line{width:18px;height:3px;background:var(--orange);border-radius:2px}.board-counter{margin-left:auto;font-family:system-ui,sans-serif}.board-controls{display:flex;gap:10px;align-items:center;justify-content:center;border-top:1px solid #edf0e5;padding-top:19px}.control-panel{border:1px solid #e0e5d7;background:#fffef9;border-radius:18px;padding:24px}.control-panel .eyebrow{font-size:9px}.control-panel h2{font-size:19px;margin-bottom:24px}.field-label{display:block;font-size:11px;color:#8b967e;margin-bottom:9px}.shape-switch{display:flex;border:1px solid #e2e7d9;border-radius:9px;padding:3px;background:#f2f4eb;margin-bottom:20px}.shape-switch button{flex:1;padding:8px;font-size:11px;border-radius:6px}.shape-switch .selected{background:white;box-shadow:0 1px 4px #31422310;color:#42653b}.range-label{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:#7f8c71;margin-top:12px}.range-label strong{font-size:12px;color:#567245;font-weight:600}input[type=range]{width:100%;accent-color:#78945e;margin:12px 0;min-height:22px;cursor:pointer}.check-row{display:flex;align-items:center;gap:8px;font-size:12px;color:#748366;margin-bottom:13px;cursor:pointer}.check-row input{width:17px;height:17px;accent-color:var(--green)}.formula-box{padding:15px;background:#f1f4e8;border-radius:10px;margin-top:20px;min-height:96px}.formula-box>span{font-size:10px;color:#9ba68b;display:block;margin-bottom:7px}.formula-box p{font-size:12px;line-height:1.8;color:#788866}.formula-box strong{font-family:system-ui,sans-serif;font-size:15px;display:block;font-weight:600;color:#526d3e}.control-panel>.text-link{margin-top:13px}.feedback{min-height:50px;background:#eeeee4;border:1px solid transparent;border-radius:11px;padding:14px 18px;color:#7e8066;font-size:12px;margin-top:18px;line-height:1.8}.feedback.success{background:#e7efdb;color:#587d3e;border-color:#d5e5c1}.preview-label{background:#f4ead7;color:#a38651;padding:5px 9px;border-radius:6px}.stepper{display:flex;border-bottom:1px solid #dde4d2;margin-bottom:24px;padding-bottom:20px;gap:37px;font-size:12px;color:#a6ae9c}.stepper span{display:flex;align-items:center;gap:10px}.stepper b{border-radius:50%;width:26px;height:26px;background:#e9eddf;display:grid;place-items:center;font-family:system-ui,sans-serif;font-size:11px}.stepper .current{color:#46683b;font-weight:650}.stepper .current b{background:#45653c;color:white}.stepper .finished{color:#829b6d}.student-layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:23px}.student-board{background:#fffefb;border:1px solid #dce4d2;border-radius:18px;padding:27px}.task-heading{display:flex;gap:15px;align-items:start;margin-bottom:20px}.task-number{font-size:28px;color:#b5c3a4;line-height:1.4;font-family:system-ui,sans-serif;font-weight:300}.task-heading h2{font-size:19px;color:#486040}.task-heading p{font-size:12px;color:#919e85;margin-top:6px;line-height:1.8}.choices{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:25px 0 32px}.choice{border:2px solid #e3e9da;border-radius:13px;background:#f6f8ef;padding:16px 9px;color:#718260;transition:background .2s,border-color .2s;min-width:0}.choice svg{width:100%;display:block}.choice>span{font-size:12px;display:block;margin-top:10px}.choice:hover:not(:disabled){background:#eaf1df;border-color:#91a875}.choice.correct{border-color:#719657;background:#e5efd7;opacity:1}.choice.try-again{border-color:#e4c8af}.choice:disabled:not(.correct){opacity:.55}.student-actions{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:20px}.walk-progress{display:flex;gap:12px;justify-content:space-between;font-size:12px;color:#859275;padding:13px 5px}.walk-progress strong{font-family:system-ui,sans-serif;color:#577245}.walk-progress span:last-child{color:#a08159;font-family:system-ui,sans-serif}.answer-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:17px;font-size:13px;color:#748665}.answer-row input{width:70px;padding:10px;border:2px solid #cad9bc;background:#fafcf6;border-radius:10px;text-align:center;font-size:19px;color:#3f643a;min-height:46px}.answer-row .button{margin-left:auto}.completion{text-align:center;padding:35px 30px 30px;background:#fffefb;border:1px solid #dae4cf;border-radius:20px}.completion-badge{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;background:#e5efd6;color:#6d9352;margin:0 auto 22px;border:7px solid #f2f6e9}.completion-badge .icon{width:32px;height:32px}.completion h2{font-size:28px;margin:8px 0 13px}.completion>p{font-size:13px;color:#87957a}.discovery-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:30px auto;max-width:740px}.discovery-cards>div{display:flex;flex-direction:column;background:#f5f7ee;border:1px solid #e8eddd;border-radius:12px;padding:20px 12px}.discovery-cards b{font-family:system-ui,sans-serif;font-weight:400;color:#bac6a8;font-size:20px;margin-bottom:8px}.discovery-cards strong{font-size:14px;color:#5f7b4c;margin-bottom:7px}.discovery-cards span{font-size:11px;color:#919f80}.button-row{display:flex;gap:13px;justify-content:center;align-items:center}.completion .save-note{margin-top:20px;font-size:10px;color:#9eaa91}dialog{border:1px solid #dce4d2;border-radius:18px;background:var(--paper);padding:30px;width:min(450px,90vw);box-shadow:0 20px 80px #20311e22;color:var(--ink)}dialog::backdrop{background:#25331f66;backdrop-filter:blur(4px)}dialog h2{font-size:23px}dialog p{font-size:13px;color:#8a957d;margin:15px 0 25px;line-height:1.9}
@media(min-width:1500px){main{padding-top:45px}.hero{min-height:350px}.unit-card{min-height:208px}.hero h2{font-size:42px}}
@media(max-width:1150px){.sidebar{width:188px;padding:28px 17px}.brand{font-size:21px}.brand small{font-size:8px}.workspace{margin-left:188px}.topbar{padding:0 27px;gap:18px}main{padding:30px 27px 24px}.footer{padding-left:27px;padding-right:27px}.hero{padding:27px}.hero h2{font-size:32px}.unit-grid{gap:11px}.unit-card{padding:15px}.unit-card h3{font-size:12px}.unit-layout{grid-template-columns:minmax(0,1fr) 205px;gap:20px}.lesson{padding:18px;gap:13px}.activity-layout{grid-template-columns:minmax(0,1fr) 235px;gap:15px}.control-panel{padding:20px}.student-layout{grid-template-columns:minmax(0,1fr) 205px;gap:15px}.student-board{padding:20px}.board{padding:16px}.board-heading>span:last-child{display:none}}
@media(max-width:950px){.sidebar{width:165px;padding:25px 13px}.brand{font-size:19px;gap:6px}.brand-mark{width:33px;height:39px;font-size:30px}.brand small{font-size:7px;letter-spacing:1px}.workspace{margin-left:165px}.sidebar-label{margin-top:37px}.topbar{padding:0 22px}.visitor{display:none}main{padding:27px 22px 20px}.edition-tag{display:none}h1{font-size:25px}.hero-copy{min-width:210px}.hero h2{font-size:30px}.garden-art{width:50%;margin-right:-22px}.unit-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.unit-card{min-height:185px}.unit-card h3{font-size:14px}.unit-layout{grid-template-columns:1fr}.unit-layout>.learning-note{display:none}.gentle-note span:last-child{display:none}.activity-layout{grid-template-columns:1fr}.control-panel{display:block}.control-panel .field-group{max-width:300px}.student-layout{grid-template-columns:1fr}.student-layout>.learning-note{display:none}.board .math-scene{max-height:400px}.activity-title h1{font-size:26px}.board-heading>span:last-child{display:block}.footer{padding-left:22px;padding-right:22px}.footer span:last-child{display:none}.control-panel{display:grid;grid-template-columns:1fr 1fr;gap:12px 28px;align-items:center}.control-panel>.eyebrow,.control-panel>h2,.control-panel>.field-group,.control-panel>hr{grid-column:1/-1;margin:0}.control-panel>.eyebrow{margin:0}.control-panel>hr{margin:5px 0}.control-panel .shape-switch{margin:0}.control-panel .formula-box{margin:0;grid-column:1/-1}.control-panel>.text-link{grid-column:1/-1}.control-panel .check-row{margin:0}.control-panel .range-label{margin:0}.control-panel input[type=range]{margin:0}}
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