:root{font-family:'Microsoft YaHei UI',system-ui,sans-serif;color:#23324a;background:#f3f6fb;font-synthesis:none}*{box-sizing:border-box}body{margin:0}header{height:76px;padding:0 max(28px,calc((100vw - 1260px)/2));display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid #e4eaf2}.brand{font-weight:800;font-size:24px;white-space:nowrap}.brand span{font-weight:400;font-size:15px;margin-left:14px;color:#68788d}.badge{background:#eef4ff;color:#426290;padding:7px 12px;border-radius:20px;font-size:13px}main{max-width:1320px;margin:auto;padding:32px}.intro{margin-bottom:28px}.eyebrow{color:#4773ce;font-weight:700;letter-spacing:2px;font-size:13px}h1{font-size:32px;letter-spacing:1px;margin:10px 0}.intro>p:last-child{color:#68788d}h2{font-size:20px;margin:0 0 24px}.columns{display:grid;grid-template-columns:360px 1fr;gap:24px}.card{padding:28px;border:1px solid #e1e7f0;border-radius:20px;background:#fff;box-shadow:0 10px 34px #23324a05}.row{display:flex;gap:10px;align-items:center}.between{justify-content:space-between}.between h2{margin-bottom:0}label{display:block;font-size:14px;font-weight:600;margin:18px 0 8px}input,select,button{font:inherit;min-height:44px;border-radius:9px}input,select{width:100%;min-width:0;padding:9px 11px;border:1px solid #ced8e5;background:#fff;color:#23324a}button{border:0;background:#eaf0fb;color:#385b99;font-size:14px;font-weight:700;padding:10px 16px;cursor:pointer;white-space:nowrap}button:hover{filter:brightness(.96)}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #85a7ec;outline-offset:2px}.primary{background:#3965d3;color:white;width:100%;margin-top:20px}.quiet{background:#f0f3f8}.hint{font-size:12px;line-height:1.9;color:#738297;overflow-wrap:anywhere}#key-status{margin-top:20px;padding:14px;border-radius:9px;background:#f1f6ff;line-height:1.8;font-size:14px}.filters{display:flex;gap:16px}.filters label{flex:1}.filters input,.filters select{margin-top:8px}.empty{text-align:center;color:#8290a1;padding:42px 0}.record{border-top:1px solid #e4eaf2;margin-top:20px;padding-top:18px}.record h3{font-size:17px;margin:0 0 6px}.meta{font-size:12px;color:#738297;margin-bottom:16px}.message{padding:14px 16px;background:#f4f7fc;border-radius:10px;margin:10px 0}.message.assistant{background:#f4f8f6}.message .role{font-size:12px;font-weight:700;color:#577394;margin-bottom:6px}.message .text{font-size:14px;line-height:1.8;white-space:pre-wrap;overflow-wrap:anywhere}footer{padding:24px 0;font-size:13px;color:#738297}@media(max-width:850px){.columns{grid-template-columns:1fr}main{padding:20px}.card{padding:22px}header{padding:0 20px}h1{font-size:27px}}
/* The same teacher page also serves the independent online single-admin service. */
.login-card{max-width:520px;margin:0 auto}.login-card input{width:100%;box-sizing:border-box;margin-bottom:16px}.login-card button{margin-top:10px}header nav{display:flex;align-items:center;gap:14px;font-size:13px}header nav a{color:inherit}header{flex-wrap:wrap;gap:12px}