:root{font-family:Segoe UI,Arial,sans-serif;color:#193f43;background:#f3f7f6;font-size:16px}*{box-sizing:border-box}body{margin:0}header{display:flex;align-items:center;justify-content:space-between;padding:24px 5%;background:white;border-bottom:1px solid #dce7e4}a{color:#126c65;text-decoration:none}.brand{font-size:24px;font-weight:750}.brand span{font-size:14px;font-weight:400;margin-left:12px}main{max-width:1120px;margin:56px auto;padding:0 24px}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:700;color:#277b6f}h1{font-size:44px;line-height:1.15;margin:16px 0}h2{font-size:22px;margin:0 0 10px}.intro{font-size:19px;color:#607776}p{line-height:1.6}section{padding:28px;background:white;border:1px solid #dde7e4;border-radius:18px;margin:24px 0}section p{color:#607776;margin-top:4px}.toolbar,.section-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.badge{display:inline-block;background:#d9eee5;color:#286b56;padding:6px 10px;border-radius:5px;font-size:11px;font-weight:bold;letter-spacing:1px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.toggle{display:flex;align-items:center;justify-content:space-between;padding:15px;border:1px solid #dce7e4;border-radius:9px;gap:20px;cursor:pointer}input[type=checkbox]{width:22px;height:22px;accent-color:#087c70;flex-shrink:0}button{border:0;border-radius:8px;padding:13px 20px;background:#087c70;color:white;font:inherit;font-weight:600;cursor:pointer}button:hover{filter:brightness(.92)}button:disabled{opacity:.5;cursor:wait}.secondary{background:#edf4f1;color:#285a53}input[type=password],input[type=search]{font:inherit;padding:12px;border:1px solid #bdcfca;border-radius:7px;max-width:100%}#login-form{display:grid;gap:12px;max-width:400px}.presets{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}details{border-top:1px solid #e3ece8;padding:14px 0}summary{cursor:pointer;font-weight:600}summary .toggle{display:inline-flex;min-width:280px;border:0;padding:0 14px}.blocks{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0 0 22px}.blocks .toggle{font-size:14px;overflow-wrap:anywhere}.blocks small{display:block;color:#647976;font-size:11px}.note{font-size:13px}.savebar{position:sticky;bottom:14px;background:#193f43;color:white;padding:16px 24px;border-radius:12px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 8px 30px #193f4320}#status{min-height:24px;font-weight:600;color:#126c65}#status.error{color:#ad3434}footer{text-align:center;color:#6d827e;font-size:13px;padding:24px}[hidden]{display:none!important}:focus-visible{outline:3px solid #e8ac30;outline-offset:3px}@media(max-width:700px){h1{font-size:32px}main{margin-top:32px}.grid,.blocks{grid-template-columns:1fr}.toolbar,.section-heading{align-items:flex-start;flex-direction:column}.savebar{gap:15px}.brand span{display:none}section{padding:20px}}
/* Classroom management */
.class-form{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.class-form input{font:inherit;padding:12px;border:1px solid #bdcfca;border-radius:7px;min-width:180px}#trash{margin-top:20px}#deleted-classes{display:flex;gap:10px;flex-wrap:wrap;margin-top:15px}.matrix-scroll{overflow:auto;max-height:70vh;border:1px solid #dce7e4;border-radius:10px;margin-top:20px;isolation:isolate}.class-matrix{border-collapse:separate;border-spacing:0;width:100%;font-size:14px}.class-matrix caption{text-align:left;font-size:13px;color:#607776;padding:12px}.class-matrix th,.class-matrix td{padding:13px 16px;border-bottom:1px solid #e2ebe7;border-right:1px solid #e2ebe7;vertical-align:middle}.class-matrix thead th{position:sticky;top:0;background:#edf5f1;z-index:3;min-width:190px;text-align:center}.class-matrix thead th:first-child{left:0;z-index:4;text-align:left;min-width:300px}.class-matrix tbody th{position:sticky;left:0;background:white;text-align:left;z-index:1;min-width:300px;font-weight:500}.class-matrix td{text-align:center;background:white}.class-matrix code{display:block;font-size:24px;letter-spacing:4px;color:#087c70;margin:8px 0}.class-matrix thead strong{display:block;font-size:18px}.class-matrix select{display:block;margin:10px auto;font:inherit;max-width:180px;padding:7px;border:1px solid #bdcfca;border-radius:6px;background:white}.delete-class{background:transparent;color:#9c3a3a;font-size:12px;padding:4px 8px}.class-matrix .matrix-section th{background:#193f43;color:white;font-weight:600;position:static}.expand-category{background:transparent;color:#193f43;text-align:left;padding:0;font-size:14px}.block-row th{padding-left:35px!important}.block-row small{display:block;color:#6a817b;font-size:10px;margin-top:4px;overflow-wrap:anywhere}.class-matrix input:disabled{opacity:.28}.template-panel{margin-top:30px}.template-panel>summary{padding:15px;background:#e7f0ec;border-radius:8px}#template-status{margin-left:12px}.join-main{max-width:760px;margin-top:80px}.join-card{max-width:500px}.join-card form{display:grid;gap:14px}.join-card label{font-weight:600}.join-card input{font:36px ui-monospace,monospace;letter-spacing:12px;width:100%;padding:18px;border:2px solid #b8d6cc;border-radius:10px;text-align:center;color:#193f43}.join-card input::placeholder{color:#b4c7c0}.join-card p{font-size:13px}.join-card button{padding:16px}#join-status.error{color:#ad3434}@media(max-width:700px){.class-matrix thead th:first-child,.class-matrix tbody th{min-width:210px;max-width:250px}.join-main{margin-top:40px}.class-form{align-items:stretch;flex-direction:column}.join-card input{font-size:30px;letter-spacing:8px}}

.php-password-form{display:grid;gap:12px;max-width:480px}.php-password-form input{font:inherit;padding:12px;border:1px solid #bdcfca;border-radius:7px}.php-password-form label{font-weight:600}.setup-link{display:inline-block;background:#087c70;color:white;padding:12px 18px;border-radius:7px}