:root{--ink:#14213d;--muted:#5b6474;--blue:#1d4ed8;--pale:#eef4ff;--line:#dce3ef;--white:#fff}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#f8fafc;font:16px/1.55 Inter,ui-sans-serif,system-ui,sans-serif}.topbar{display:flex;align-items:center;justify-content:space-between;padding:1rem max(5vw,1.25rem);background:var(--white);border-bottom:1px solid var(--line)}.brand{font-weight:800;color:var(--ink);text-decoration:none}.topbar nav{display:flex;gap:1rem;align-items:center}.topbar nav form{display:inline}.topbar a,.topbar button{color:var(--blue);background:none;border:0;text-decoration:none;font:inherit;cursor:pointer}main{max-width:1120px;margin:auto;padding:clamp(2rem,6vw,5rem) 1.25rem}.hero{max-width:800px;padding:4rem 0}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.76rem;font-weight:800;color:var(--blue)}h1{font-size:clamp(2.4rem,6vw,5rem);line-height:1.02;letter-spacing:-.05em;margin:.5rem 0 1.25rem}.lead{font-size:1.25rem;color:var(--muted);max-width:650px}.actions{display:flex;gap:1.2rem;align-items:center;margin-top:2rem}.button{display:inline-block;border:0;border-radius:.65rem;background:var(--blue)!important;color:#fff!important;padding:.7rem 1rem;text-decoration:none;font-weight:700}.button-cluster{display:flex;flex-wrap:wrap;align-items:center;gap:.7rem;margin-top:1rem}.grid,.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}.grid article,.panel,.auth,.form-card,.stats article{background:#fff;border:1px solid var(--line);border-radius:1rem;padding:1.5rem}.form-card{max-width:52rem;margin:1rem 0}.page-head{margin-bottom:2rem}.page-head h1,.auth h1{font-size:clamp(2rem,5vw,3.5rem)}.stats article{display:flex;flex-direction:column}.stats strong{font-size:2.5rem}.stats span{color:var(--muted)}.panel{margin-top:1rem}.auth{max-width:560px;margin:2rem auto}.auth input,.auth select{width:100%;padding:.7rem;border:1px solid var(--line);border-radius:.5rem}.helptext{font-size:.85rem;color:var(--muted)}.messages{max-width:1120px;margin:1rem auto;padding:0 1.25rem}.messages p{padding:1rem;background:#dcfce7;border-radius:.5rem}.lesson-plan{margin:1rem 0;padding:1rem;border:1px solid var(--line);border-radius:.75rem;background:var(--pale)}.lesson-plan summary{cursor:pointer}.lesson-plan h4{margin:1.25rem 0 .25rem}.panel iframe{display:block;max-width:100%;border:0;border-radius:.75rem}footer{text-align:center;padding:2rem;color:var(--muted)}.assignment-section{padding:clamp(1.25rem,3vw,2rem);scroll-margin-top:1rem}.assignment-section-head{display:flex;align-items:end;justify-content:space-between;gap:1.5rem;margin-bottom:1.5rem}.assignment-section-head .eyebrow{margin:0 0 .25rem}.assignment-section-head h2{margin:0;font-size:clamp(1.65rem,3vw,2.2rem)}.assignment-section-head p:last-child{margin:.35rem 0 0;color:var(--muted)}.assignment-count{flex:none;padding:.4rem .75rem;border-radius:999px;background:var(--pale);color:var(--blue);font-size:.82rem;font-weight:800}.assignment-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.assignment-card{display:grid;grid-template-columns:auto minmax(0,1fr);gap:.9rem;padding:1.15rem;border:1px solid var(--line);border-radius:.9rem;background:linear-gradient(145deg,#fff,#f8faff);box-shadow:0 8px 22px rgba(20,33,61,.05)}.assignment-card-icon{display:grid;place-items:center;width:2.35rem;height:2.35rem;border-radius:.7rem;background:var(--pale);color:var(--blue);font-weight:900}.assignment-card-body{min-width:0}.assignment-card h3{margin:.05rem 0 .65rem;font-size:1.05rem;line-height:1.35}.assignment-due{display:flex;flex-wrap:wrap;gap:.35rem;margin:0;color:var(--muted);font-size:.85rem}.assignment-due span{color:var(--ink);font-weight:800}.assignment-action{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between;margin-top:.15rem}.assignment-empty{grid-column:1/-1;padding:2rem;border:1px dashed var(--line);border-radius:.9rem;text-align:center;color:var(--muted)}.assignment-empty strong{color:var(--ink);font-size:1.1rem}.assignment-empty p{margin:.35rem 0 0}@media(max-width:720px){.assignment-grid{grid-template-columns:1fr}.assignment-section-head{align-items:start;flex-direction:column;gap:.75rem}.assignment-card{grid-template-columns:auto minmax(0,1fr)}}