:root{font-family:ui-rounded,system-ui,-apple-system,sans-serif;color:#173e38;background:#f6f5ec;font-size:18px}*{box-sizing:border-box}body{margin:0}header{display:flex;align-items:center;gap:24px;padding:24px 5%;border-bottom:1px solid #dce4d6}header span{flex:1;font-size:.85rem;color:#526b62}.brand{text-decoration:none;font-size:1.65rem;font-weight:800;color:#236655;letter-spacing:-1px}main{max-width:880px;margin:48px auto;padding:0 24px;min-height:65vh}h1{font-size:clamp(1.8rem,5vw,3rem);max-width:700px;line-height:1.15;letter-spacing:-1px}h2{line-height:1.4}.eyebrow{font-size:.7rem;font-weight:800;letter-spacing:2px;color:#4b7c65}.card{background:#fff;border:1px solid #dde5d8;border-radius:26px;padding:30px;margin:24px 0;box-shadow:0 8px 28px #1e473407}button,select,input{font:inherit;border:1px solid #9cae9c;border-radius:12px;padding:12px 18px;min-height:48px}button{cursor:pointer;background:#fff;color:#173e38;font-weight:650}button:hover{background:#edf4e7}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #e5a13c;outline-offset:3px}.primary{background:#226552;color:white;border-color:#226552}.primary:hover{background:#174b3e}button:disabled{opacity:.5;cursor:wait}label{display:flex;flex-direction:column;gap:8px;margin:16px 0;font-size:.9rem}input,select{max-width:100%;background:#fff}form{max-width:580px}fieldset{border:0;padding:0;margin:0}.toolbar{display:flex;gap:18px;align-items:center;justify-content:space-between;flex-wrap:wrap}.toolbar label{margin:0}.course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}.course-grid .card{margin:24px 0 0}.help-buttons{display:flex;flex-wrap:wrap;align-items:center;gap:10px;border-top:1px solid #e2e8df;padding-top:24px;margin-top:24px}.help-buttons button{font-size:.85rem}.help-buttons label{font-size:.75rem}aside{background:#fff5d8;border-radius:18px;padding:24px;margin-top:16px}#notice,#feedback{line-height:1.6}#feedback{font-weight:650;color:#226552}.option{display:flex;flex-direction:row;align-items:center;gap:12px;padding:14px;background:#f6f8f2;border-radius:14px}.option input{min-height:22px;min-width:22px}.fields{display:flex;gap:16px;flex-wrap:wrap}.fields label{flex:1;min-width:180px}.ordered{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0;min-height:52px;padding:8px;background:#f4f8ef;border-radius:14px}.objects{display:flex;flex-wrap:wrap;gap:8px;padding:14px;margin:10px 0;border:1px solid #dde5d8;border-radius:14px}.object{width:24px;height:24px;background:#edaf4e;border:2px solid #ac7429;border-radius:50%}.object.square{border-radius:4px;background:#81b39e}.object.star{clip-path:polygon(50% 0,61% 35%,98% 35%,68% 57%,79% 95%,50% 72%,21% 95%,32% 57%,2% 35%,39% 35%);border:0}.expression{font-size:1.4rem;padding:20px;text-align:center}.fraction{display:inline-flex;vertical-align:middle;flex-direction:column;text-align:center;margin:0 7px}.fraction span:first-child{border-bottom:2px solid currentColor}.tray{height:100px;border:5px solid #b98b51;border-radius:50%;background:#fcf3df;margin:24px auto;max-width:300px}.stimulus-table{border-collapse:collapse;width:100%;font-size:.9rem;margin:18px 0}.stimulus-table td,.stimulus-table th{border:1px solid #bccdbd;padding:10px}.column-arithmetic{font-family:ui-monospace,monospace;font-size:1.5rem;text-align:right;max-width:240px;margin:20px auto;white-space:pre-line;border-bottom:2px solid}.celebrate{font-size:4rem;color:#db9a35}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}[hidden]{display:none!important}footer{text-align:center;padding:36px;font-size:.75rem;color:#6f8279}@media(max-width:600px){header span{display:none}main{margin-top:28px}.card{padding:22px}button{font-size:.9rem}.toolbar{align-items:stretch}.help-buttons button{flex:1}}

.demo-banner{padding:14px 24px;background:#fff0c2;color:#5b4213;text-align:center;font-size:.9rem;font-weight:700;border-bottom:1px solid #dccb99}