.portal-hero{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;padding:64px 0 72px}.portal-intro h1{font-size:clamp(38px,4.1vw,58px);letter-spacing:-.045em;line-height:1.25;max-width:580px}.portal-intro p{margin:25px 0 30px;max-width:500px;color:var(--muted);font-size:16px;line-height:1.9}.portal-intro .button{gap:22px}.portal-intro .button svg,.course-action svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7}.portal-demo{background:var(--stage);border:1px solid #dbe7df;border-radius:20px;overflow:hidden}.demo-caption{padding:20px 24px 0;display:flex;justify-content:space-between;gap:10px;align-items:center}.demo-caption h2{font-size:14px;letter-spacing:0}.demo-caption span{font-size:11px;color:var(--muted)}#portal-scene{height:280px;display:grid;place-items:center;min-width:0}#portal-scene canvas{max-width:100%;display:block;touch-action:pan-y}#portal-scene>p{font-size:13px;padding:24px}.demo-controls{padding:0 24px 22px;font-size:12px}.demo-controls p{color:var(--muted);margin:0 0 12px}.demo-controls label{display:flex;justify-content:space-between}.demo-controls input{width:100%;accent-color:var(--green);height:28px;margin:4px 0 9px}.demo-controls a{text-decoration:underline;text-underline-offset:4px;font-weight:600}.course-library{border-top:1px solid var(--line);padding-top:42px}.library-heading{display:flex;align-items:flex-start;gap:32px;justify-content:space-between}.library-heading h2{font-size:32px}.library-heading p{font-size:14px;color:var(--muted);margin:13px 0 0;max-width:670px}.library-heading>span{font-size:12px;white-space:nowrap;padding-top:10px;color:var(--muted)}.library-tools{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:28px 0}.course-filters{display:flex;gap:8px;flex-wrap:wrap}.course-filters button{border:1px solid var(--line);background:transparent;color:var(--ink);border-radius:7px;padding:9px 15px;font-size:12px;min-height:42px}.course-filters button[aria-pressed=true]{background:var(--green);border-color:var(--green);color:#fff}.course-search{display:flex;align-items:center;gap:9px;border-bottom:1px solid #b8c9bd;padding:8px 0;min-width:220px}.course-search svg{width:18px;height:18px;fill:none;stroke:var(--muted);stroke-width:1.6}.course-search input{width:100%;min-width:0;border:0;background:transparent;font-size:13px;padding:4px}.course-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.course-entry{border:1px solid var(--line);background:#fff;border-radius:14px;overflow:hidden;transition:box-shadow .18s,border-color .18s}.course-entry:hover{border-color:#9eb69a;box-shadow:0 10px 24px #213d3709}.course-entry[hidden],#course-empty[hidden]{display:none}.course-cover{height:210px;background:#eef3e7;position:relative;overflow:hidden}.course-cover.cuboid-nets{background:#f4eee2}.course-cover.volume{background:#eaf2f3}.course-cover.cross-sections{background:#f1edf4}.course-art{width:100%;height:100%}.course-cover>span{position:absolute;left:18px;top:16px;font-size:10px;color:#4e6256;background:#ffffffb8;border-radius:4px;padding:3px 8px}.course-copy{padding:24px 26px}.course-category{font-size:11px;font-weight:600;color:#708561}.course-copy h3{font-size:25px;letter-spacing:-.03em;margin:7px 0 14px}.course-copy p{color:var(--muted);font-size:13px;line-height:1.85;margin:0 0 16px}.course-copy .course-question{font-size:15px;color:var(--ink);font-weight:600;margin-bottom:9px}.course-action{display:flex;align-items:center;justify-content:space-between;font-size:12px;font-weight:650;padding-top:16px;border-top:1px solid var(--line);margin-top:22px}#course-empty{padding:45px;text-align:center;background:#fff;border-radius:12px}.portal-teaching{margin:56px 0;display:flex;align-items:center;justify-content:space-between;gap:40px;border-top:1px solid var(--line);padding-top:40px}.portal-teaching h2{font-size:25px}.portal-teaching p{max-width:700px;font-size:14px;color:var(--muted);margin:14px 0 0}.portal-teaching .button{flex-shrink:0}.course-rail{display:flex;align-items:center;gap:5px;max-width:1200px;padding:13px 32px 0;margin:auto;overflow:auto;font-size:11px}.course-rail a{white-space:nowrap;padding:7px 10px;border-radius:5px}.course-rail a[aria-current]{background:#e7efdf;font-weight:650}.course-rail .rail-back{margin-right:auto;padding-left:0;color:var(--muted)}.next-courses{margin:44px auto;padding-bottom:38px}.next-courses h2{font-size:22px;margin-bottom:20px}.next-courses>div{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.next-courses a{display:block;border-top:1px solid var(--line);padding-top:16px}.next-courses strong{font-size:15px}.next-courses p{font-size:12px;color:var(--muted);margin:8px 0 0}.information{overflow-wrap:anywhere}@media(max-width:1000px){.portal-hero{gap:36px}.portal-intro h1{font-size:42px}.library-tools{align-items:flex-start}.course-search{min-width:185px}.course-cover{height:190px}.course-rail .rail-back{margin-right:12px}}@media(max-width:740px){.portal-hero{grid-template-columns:1fr;gap:32px;padding:34px 0 44px}.portal-intro h1{font-size:38px;max-width:470px}.portal-intro p{font-size:14px;margin:20px 0 24px}.demo-caption{padding:18px 20px 0}#portal-scene{height:250px}.demo-controls{padding:0 20px 20px}.library-heading{display:block}.library-heading h2{font-size:28px}.library-heading>span{display:block;margin-top:8px}.library-heading p{font-size:13px}.library-tools{display:block;margin:22px 0}.course-search{margin-top:17px;width:100%}.course-filters{gap:6px}.course-filters button{padding:8px 11px;font-size:11px}.course-grid{grid-template-columns:1fr;gap:22px}.course-cover{height:200px}.course-copy{padding:22px}.course-copy h3{font-size:24px}.portal-teaching{display:block;margin:40px 0}.portal-teaching h2{font-size:23px}.portal-teaching .button{margin-top:22px}.course-rail{padding:12px 20px 0;gap:4px}.course-rail a{font-size:10px;padding:7px}.next-courses>div{grid-template-columns:1fr;gap:18px}.next-courses{margin-top:28px}.next-courses p{margin-bottom:0}}@media print{.course-rail,.next-courses{display:none!important}}