@font-face{font-family:"Source Sans 3";font-style:normal;font-display:swap;font-weight:400;src:url(./source-sans-3-latin-400-normal-DQi5PRDE.woff2) format("woff2"),url(./source-sans-3-latin-400-normal-RR2C27NP.woff) format("woff")}@font-face{font-family:"Source Sans 3";font-style:normal;font-display:swap;font-weight:600;src:url(./source-sans-3-latin-600-normal-DeckBYAU.woff2) format("woff2"),url(./source-sans-3-latin-600-normal-Ck0n4g8U.woff) format("woff")}@font-face{font-family:"Source Sans 3";font-style:normal;font-display:swap;font-weight:700;src:url(./source-sans-3-latin-700-normal-CkzU-mV9.woff2) format("woff2"),url(./source-sans-3-latin-700-normal-B-h9tW5h.woff) format("woff")}:root{font-family:"Source Sans 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h3{margin-bottom:5px}.quiet-callout p{font-size:.94rem;margin:0;color:var(--muted)}.quiet-callout .button{flex-shrink:0}.filter-tabs{display:flex;gap:5px;border-bottom:1px solid var(--line);margin-bottom:28px;flex-wrap:wrap}.filter-tabs button{background:transparent;color:var(--muted);padding:12px 17px;min-height:48px;border-bottom:3px solid transparent}.filter-tabs button.selected{color:var(--teal);border-bottom-color:var(--teal);font-weight:600}.back-link{display:inline-flex;align-items:center;gap:7px;min-height:44px;color:var(--teal);font-size:.9rem;background:transparent;padding:0;margin-bottom:15px}.back-link:hover{text-decoration:underline}.auth-shell{display:grid;grid-template-columns:1fr 1fr;min-height:100vh;background:#fff}.auth-form-side{padding:38px 60px;display:flex;flex-direction:column;max-width:760px;width:100%;justify-self:center}.auth-content{width:100%;max-width:420px;margin:auto;padding:48px 0}.auth-content h1{font-size:2.8rem;line-height:1.07;letter-spacing:-1px;margin:20px 0 16px}.lead{font-size:1.12rem;color:var(--muted);line-height:1.65}.auth-content .stack-form{margin-top:28px}.auth-content .stack-form>.button{width:100%}.auth-help{font-size:.86rem;color:var(--muted);line-height:1.6;margin:22px 0 10px}.small-link{color:var(--teal);font-size:.83rem;text-decoration:underline;min-height:44px;display:inline-flex;align-items:center}.auth-foot{color:#627582;padding-bottom:10px}.auth-photo-side{position:relative;min-height:100vh;overflow:hidden;background:#dce8e4}.auth-photo-side>.photo{position:absolute;inset:0}.auth-photo-side .photo img{object-position:45% center;filter:brightness(.72)}.auth-photo-copy{position:absolute;bottom:12%;left:10%;right:7%;color:#fff}.auth-photo-copy h2{color:#fff;font-size:3rem;line-height:1.1;margin:20px 0}.auth-photo-copy p{font-size:1.15rem;color:#eef5f3}.photo-label{padding:7px 11px;border:1px solid #ffffff90;border-radius:6px;font-size:.85rem;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.lesson-step-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin-bottom:24px}.lesson-step-tabs>button{display:flex;align-items:center;gap:12px;text-align:left;border:1px solid var(--line);background:#fff;border-radius:10px;padding:16px;min-height:83px;color:var(--muted)}.lesson-step-tabs>button>span{display:grid;place-items:center;flex-shrink:0;width:31px;height:31px;background:#eef3f4;border-radius:50%}.lesson-step-tabs strong{display:block;color:var(--ink);font-size:1.1rem}.lesson-step-tabs small{display:block;margin-top:2px}.lesson-step-tabs>button.selected{border-color:var(--teal);background:#eef8f4;color:var(--teal)}.lesson-step-tabs>button.selected>span{background:var(--teal);color:#fff}.lesson-explanation{background:#fff;border:1px solid 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span{font-size:.9rem;display:block;color:var(--muted)}.teacher-notes{font-size:.92rem;color:var(--muted)}.teacher-notes li{margin:10px 0}.teacher-notes summary{color:var(--ink);font-weight:600;cursor:pointer;min-height:30px}.lesson-reading .email-paper{height:fit-content}.activity-intro{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center;margin:12px 0 30px}.activity-intro h1{font-size:2.7rem;margin:18px 0}.activity-intro>.photo{height:250px;border-radius:14px}.intro-facts{display:flex;flex-wrap:wrap;gap:12px 20px;font-size:.88rem;color:var(--muted);margin-top:20px}.intro-facts>span{display:flex;gap:7px;align-items:center}.mode-selection h2{margin-bottom:22px}.mode-options{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:24px}.mode-options>button{display:block;position:relative;text-align:left;padding:23px 19px;border:1px solid var(--line);border-radius:10px;color:var(--muted);background:#fff}.mode-options>button.selected{border:2px solid var(--teal);padding:22px 18px;background:#f2f9f6}.mode-options strong{display:block;color:var(--ink);font-size:1.15rem;margin:12px 0 8px}.mode-options p{font-size:.95rem;margin:0}.radio-dot{display:block;width:17px;height:17px;border:1px solid #a9bdc5;border-radius:50%}.selected .radio-dot{border:5px solid var(--teal)}.workbench-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px;gap:10px}.workbench-heading>.back-link{margin:0}.workbench-heading>div{display:flex;gap:14px;align-items:center}.save-status{font-size:.8rem;color:#68878a;display:flex;gap:5px;align-items:center}.exercise-title{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:15px 0 20px}.exercise-title h1{font-size:2.25rem}.exercise-title p{color:var(--muted);font-size:.95rem;margin:0}.timer{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px 16px;white-space:nowrap;color:var(--ink)}.timer strong{font-size:1.3rem;font-variant-numeric:tabular-nums}.timer span{font-size:.75rem;color:var(--muted)}.timer-warning{color:#a43b2f;border-color:#e2b9b0;background:#fff1e9}.exercise-progress{display:flex;align-items:center;gap:15px;font-size:.83rem;color:var(--muted);margin-bottom:23px}.exercise-progress .progress-track{max-width:200px;flex:1}.reading-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.08fr);gap:24px;align-items:start}.diagram-panel{position:sticky;top:20px;min-width:0}.diagram-panel>.photo{height:170px;border-radius:12px 12px 0 0}.diagram-panel .diagram{border-top-left-radius:0;border-top-right-radius:0}.diagram{background:#fff;border:1px solid #d3dfe2;border-radius:12px;overflow:hidden}.diagram-heading{padding:22px;background:#eaf3f1;display:flex;align-items:center;gap:13px;border-bottom:1px solid #d7e4e0}.diagram-heading h2{font-size:1.45rem;line-height:1.2;margin-bottom:6px}.diagram-heading 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