:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif;color:#243b4b;background:#f4f6f8;font-synthesis:none;line-height:1.55;--accent:#006b62;--line:#dfe6e9}*{box-sizing:border-box}body{margin:0}header{background:#fff;border-bottom:1px solid var(--line);padding:19px max(24px,calc((100vw - 1240px)/2));display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{display:flex;align-items:center;gap:12px;font-size:24px;font-weight:750;color:#1c3443;text-decoration:none;line-height:1.15}.brand small{display:block;font-size:10px;letter-spacing:2px;font-weight:600;margin-top:5px}.mark{display:grid;place-items:center;background:var(--accent);color:#fff;border-radius:12px;width:45px;height:45px;font-size:36px}nav{display:flex;gap:22px;align-items:center;flex-wrap:wrap}a{color:var(--accent);text-underline-offset:3px}header nav a{text-decoration:none;font-size:14px}main{max-width:1240px;margin:0 auto;padding:44px 24px 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#193d4a12;border-color:#80b5a9}.course h2{margin-top:14px}.course strong{color:var(--accent);font-size:14px;margin-top:auto}.meta{border-top:1px solid var(--line);padding-top:14px;margin:6px 0 24px;display:flex;gap:14px;flex-wrap:wrap;color:#667983;font-size:12px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:4px 24px}label{display:block;font-size:13px;font-weight:650;margin:0 0 18px}input,select,textarea{display:block;width:100%;border:1px solid #ccd8de;border-radius:7px;padding:11px 12px;background:#fff;font:inherit;color:#243b4b;margin-top:7px;min-height:44px}input:focus,select:focus,textarea:focus{outline:2px solid #50a897;outline-offset:2px}input[type=file]{font-size:12px}input[type=checkbox]{display:inline;width:18px;min-height:18px;margin:0 10px 0 0;vertical-align:middle}textarea{font-family:ui-monospace,monospace;font-size:12px;margin-bottom:22px;white-space:pre;resize:vertical}.check{display:flex;align-items:center}.help{font-size:12px;margin-top:-8px}button,.button{display:inline-block;border:0;border-radius:7px;background:var(--accent);color:#fff;text-decoration:none;padding:12px 18px;font:inherit;font-size:13px;font-weight:650;cursor:pointer}button:hover,.button:hover{filter:brightness(.94)}.quiet{padding:5px 0;background:none;color:#526672}.danger{color:#b14031}.secondary{background:#e4eee9;color:#17604e}.login{max-width:455px;margin:6vh auto 4vh;background:#fff;border:1px solid var(--line);border-radius:16px;padding:36px}.login h1{font-size:38px}.login form{margin:28px 0}.login button{width:100%}.login .muted:last-child{font-size:12px;margin-bottom:0}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(155px,1fr));background:#e9f2ef;border:1px solid #d8e9e2;border-radius:12px;margin:28px 0}.stats div{padding:20px 24px;font-size:12px;color:#527367}.stats strong{display:block;font-size:28px;color:#21564a;font-weight:650}.tabs{margin:0 0 24px;gap:8px}.tabs a{padding:8px 14px;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:6px;font-size:13px}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:12px;white-space:nowrap}td,th{padding:13px 10px;border-bottom:1px solid var(--line);text-align:left}th{font-size:11px;color:#5f7380;background:#f7f9fa}td form{margin:0}.notice{padding:15px 18px;background:#e8f3f0;border-left:3px solid #388571;border-radius:5px;font-size:13px}.notice.error{background:#fff0e7;border-color:#c16e40;color:#884b2b}.actions{display:flex;gap:10px;margin-bottom:24px}.files{list-style:none;padding:0;margin:26px 0 0}.files li{display:flex;align-items:center;gap:14px;border-top:1px solid var(--line);padding:14px 0;flex-wrap:wrap}.files small{margin-left:auto;color:#70858b}.back{display:inline-block;margin-bottom:22px;font-size:13px;text-decoration:none}footer{text-align:center;color:#829399;font-size:11px;padding:24px}button:focus-visible,a:focus-visible{outline:3px solid #60ab96;outline-offset:3px}@media(max-width:650px){header{padding:16px;align-items:flex-start;flex-direction:column}nav{gap:14px}main{padding:28px 16px}.card{padding:20px}.login{padding:24px;margin-top:20px}.stats div{padding:16px}.heading{align-items:flex-start}.grid{grid-template-columns:1fr}.tabs{gap:6px}.tabs a{padding:7px 9px}table{font-size:11px}}

.user-row{border-bottom:1px solid var(--line)}.user-row summary{cursor:pointer;padding:18px 4px;display:flex;gap:10px;align-items:center;flex-wrap:wrap;list-style-position:inside}.user-row summary:before{content:"＋";color:var(--accent)}.user-row[open] summary:before{content:"−"}.username{font-size:13px;color:#667983}.user-body{padding:18px 4px 22px}.user-actions{border-top:1px solid var(--line);margin-top:24px;padding-top:2px}.user-actions .help{margin:0 0 18px}.account-note{font-size:13px;margin:20px 0 0}.badge.inactive{background:#edf0f2;color:#64717a}.user-row summary small{color:#667983}