:root{--ink:#1c1917;--muted:#78716c;--card:#fff;--line:#e7e5e4;--brand:#4f46e5;--brand-dark:#4338ca;--bg:#fafaf9}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0;font-family:-apple-system,Segoe UI,Roboto,Arial,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}.site-header{background:var(--card);border-bottom:1px solid var(--line)}.site-header-inner{justify-content:space-between;align-items:center;max-width:56rem;margin:0 auto;padding:.7rem 1rem;display:flex}.brand{align-items:center;font-size:1.05rem;font-weight:700;display:flex}.brand-icon{margin-right:.5rem;font-size:1.4rem}.nav-links{font-size:.9rem}.nav-links a{color:var(--muted);margin-left:1rem}.nav-links a:hover{color:var(--ink)}.nav-admin{border:1px solid var(--line);border-radius:8px;padding:.35rem .7rem}.site-main{max-width:56rem;margin:0 auto;padding:1rem 1rem 2.5rem}.page-title{margin:0 0 .4rem;font-size:1.75rem;font-weight:700}.text-center{text-align:center}.page-head{margin-bottom:1.75rem}.page-head .subtitle{color:var(--muted);margin:.25rem 0 0}.muted{color:var(--muted)}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:1.25rem}.card-dashed{color:var(--muted);text-align:center;border-style:dashed;padding:2rem 1rem}.class-grid{display:block}.class-card{background:var(--card);border:1px solid var(--line);vertical-align:top;border-radius:16px;margin-bottom:1rem;padding:1.25rem;display:block}.class-card:hover{border-color:var(--brand)}@media (min-width:40rem){.class-card{width:48.5%;display:inline-block}.class-card:nth-child(odd){margin-right:3%}}.class-card .class-emoji{font-size:2rem}.class-card h2{margin:.5rem 0 .25rem;font-size:1.1rem;font-weight:700}.class-card p{color:var(--muted);margin:.2rem 0 0;font-size:.95rem}.class-card .class-count{color:var(--brand);margin-top:.8rem;font-size:.8rem;font-weight:600}.class-head{align-items:center;display:flex}.class-head .class-emoji{margin-right:.75rem;font-size:2.25rem}.material{margin-bottom:1.25rem}.material-head{margin-bottom:.5rem}.material-head h2{font-size:1.15rem;font-weight:700;display:inline}.material-date{color:var(--muted);float:none;font-size:.8rem}@media (min-width:30rem){.material-date{float:right}}.prose-content{color:#292524;word-break:break-word;font-size:1rem;line-height:1.7}.prose-content p{margin:0 0 .9rem}.prose-content p:last-child{margin:0}.prose-content a{color:var(--brand);text-decoration:underline}.prose-content h1{margin:1.4rem 0 .7rem;font-size:1.5rem;font-weight:700}.prose-content h2{margin:1.3rem 0 .6rem;font-size:1.25rem;font-weight:700}.prose-content h3{margin:1.2rem 0 .5rem;font-size:1.125rem;font-weight:600}.prose-content ul{margin:0 0 .9rem;padding-left:1.4rem;list-style:outside}.prose-content ol{margin:0 0 .9rem;padding-left:1.4rem;list-style:decimal}.prose-content li{margin-bottom:.3rem}.prose-content blockquote{border-left:3px solid var(--line);color:var(--muted);margin:0 0 .9rem;padding-left:1rem;font-style:italic}.prose-content hr{border:0;border-top:1px solid var(--line);margin:1.2rem 0}.prose-content img{border-radius:12px;max-width:100%;height:auto;margin:.5rem 0 1rem}.btn{border:1px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer;border-radius:12px;padding:.7rem 1.1rem;font-size:.95rem;display:inline-block}.btn:hover{background:#f5f5f4}.btn-primary{background:var(--brand);border-color:var(--brand);color:var(--card);font-weight:600}.btn-primary:hover{background:var(--brand-dark)}.pin-screen{text-align:center;max-width:22rem;margin:12vh auto 0}.pin-screen .lock-icon{font-size:2.75rem}.pin-screen h1{margin:.75rem 0 .25rem;font-size:1.15rem;font-weight:700}.pin-screen p{color:var(--muted);margin:.25rem 0 0;font-size:.95rem}.pin-input{text-align:center;letter-spacing:.3em;border:1px solid var(--line);background:var(--card);width:100%;color:var(--ink);border-radius:12px;padding:.8rem;font-size:1.15rem}.pin-input:focus{border-color:var(--brand);outline:2px solid #c7d2fe}.pin-error{color:#dc2626;margin:.75rem 0 0;font-size:.9rem;font-weight:600}.login-screen{text-align:center;max-width:22rem;margin:12vh auto 0}.login-screen .teacher-icon{font-size:2.75rem}.login-screen h1{margin:.75rem 0 .25rem;font-size:1.2rem;font-weight:700}.login-screen p{color:var(--muted);margin:.25rem 0 1rem;font-size:.95rem}.google-btn{border:1px solid var(--line);background:var(--card);cursor:pointer;width:100%;color:var(--ink);border-radius:12px;justify-content:center;align-items:center;padding:.75rem;font-size:.95rem;font-weight:600;display:flex}.google-btn:hover{background:#f5f5f4}.google-btn img{margin-right:.6rem}