:root{color-scheme:light;--green:#214a99;--ink:#182b53;--muted:#596a87;--line:#dbe2ed;--sage:#edf3fb;--amber:#3768ce}*{box-sizing:border-box}body{margin:0;background:#fcfaf7;font:16px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink)}button,input,textarea,select{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}button:focus-visible,a:focus-visible{outline:3px solid #9db7e5;outline-offset:3px}a{color:inherit}.header{max-width:760px;margin:auto;padding:18px 20px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:9px;text-decoration:none;font-size:22px}.outline{border:1px solid var(--green);border-radius:10px;background:white;color:var(--green);padding:6px 14px;white-space:nowrap}main{max-width:760px;margin:auto;padding:22px 20px}h1{font-size:30px;line-height:1.25;letter-spacing:-.6px;margin:12px 0}h2{font-size:21px;line-height:1.4;margin:0 0 16px}.lead{color:var(--muted);font-size:15px;margin:0 0 20px}.preview{font-size:12px;background:var(--sage);display:inline-block;padding:4px 10px;border-radius:6px;margin:0}.preview[hidden]{display:none}.grades{display:flex;gap:7px;overflow-x:auto;padding-bottom:10px;scrollbar-width:thin}.grades button{background:#fff;border:1px solid var(--line);border-radius:7px;padding:5px 9px;white-space:nowrap;font-size:13px;flex-shrink:0}.grades button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}.tabs{display:flex;gap:24px;border-bottom:1px solid var(--line);margin-top:6px}.tabs button{background:none;border:none;color:var(--muted);font-size:17px;font-weight:600;padding:10px 4px 12px;border-bottom:3px solid transparent}.tabs button[aria-pressed=true]{color:var(--green);border-bottom-color:var(--green)}.rank-row{display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);padding:18px 0}.rank-number{font-size:24px;font-weight:600;color:var(--amber);min-width:33px}.rank-info{min-width:0;flex:1}.rank-title{font-size:18px;font-weight:600;line-height:1.4}.rank-meta{font-size:13px;color:var(--muted);margin-top:4px}.rank-actions{display:flex;flex-direction:column;align-items:flex-end;gap:7px}.support{padding:7px 11px;font-size:14px}.support[aria-pressed=true]{background:var(--sage)}.text-button{border:0;background:none;color:var(--green);padding:0;font-size:12px;text-decoration:underline;text-underline-offset:3px}.request-form{background:var(--sage);border-radius:13px;margin:24px -4px 0;padding:20px 16px}.form-selects{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-selects label,.field{display:block;font-size:14px;font-weight:500;margin-bottom:14px}input,textarea,select{display:block;width:100%;border:1px solid #d5deed;border-radius:9px;padding:10px 12px;background:#fff;color:var(--ink);margin-top:6px;outline:none}input:focus,textarea:focus,select:focus{border-color:var(--green);box-shadow:0 0 0 2px #214a9916}textarea{min-height:90px;resize:vertical}::placeholder{color:#8793a9;font-size:14px}.optional{font-weight:400;color:var(--muted);font-size:12px}.help{color:var(--muted);font-size:13px;margin:10px 0}.privacy{font-size:12px;color:var(--muted);margin:10px 0}.primary{display:block;border:0;border-radius:9px;width:100%;padding:12px;background:var(--green);color:white;font-size:17px;font-weight:600}.primary:hover{background:#183c80}.hint{color:var(--muted);font-size:13px;white-space:pre-wrap;margin:8px 0}.hint:empty{display:none}.login-help{text-align:center;font-size:12px;color:var(--muted);margin:12px 0 0}footer{text-align:center;color:var(--muted);font-size:12px;padding:28px 0 8px}dialog{border:0;border-radius:14px;padding:0;width:min(680px,calc(100% - 24px));max-height:90dvh;box-shadow:0 20px 70px #214a9930}dialog::backdrop{background:#172b5566}.discussion-shell{padding:22px}.discussion-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.discussion-header h2{margin-bottom:8px}.message{padding:15px 0;border-bottom:1px solid var(--line)}.message-name{font-size:13px;color:var(--muted)}.message-body{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;margin:5px 0 8px}.message.reply{margin-left:20px;border-left:2px solid var(--line);padding-left:12px}.message-actions{display:flex;gap:18px}#message-form{margin-top:20px}.empty{font-size:14px;color:var(--muted);padding:24px 0}body:has(dialog[open]){overflow:hidden}@media(min-width:700px){main{padding:30px 40px}.header{padding:20px 40px}h1{font-size:36px}.rank-row{padding:22px 0}.rank-title{font-size:21px}.rank-meta{font-size:14px}.request-form{padding:26px}.grades{gap:10px}.grades button{font-size:14px;padding:6px 14px}}
@media(max-width:500px){.grades{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:5px;overflow:visible}.grades button{padding:6px 0;font-size:12px;min-width:0}}

.jump-form{display:block;text-align:right;font-size:12px;margin:10px 0 0;color:var(--green);text-underline-offset:3px}.more-courses{width:100%;border:0;background:none;padding:12px;color:var(--green);font-size:13px}.rank-row{padding:12px 0}.support{padding:5px 10px}.rank-actions{gap:5px}

.return-nav{max-width:760px;margin:0 auto;padding:14px 20px 0}.back-home{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 14px;border:1px solid #c4d4ed;border-radius:12px;background:#edf3fb;color:#214a99;font-size:14px;font-weight:600;text-decoration:none}.back-home:hover{background:#e2ecfa;border-color:#9db7e5}.back-home:focus-visible{outline:3px solid #214a99;outline-offset:3px}

.course-search{margin:20px 0 16px}.course-search>label{font-size:15px;font-weight:600}.search-controls{display:flex;gap:8px;align-items:center;margin-top:7px}.search-controls input{flex:1;min-width:0;margin:0;min-height:44px}.search-controls button{flex:none;min-height:44px}.search-add{display:block;margin-top:12px}.search-empty{padding:20px 0}.search-empty p{color:var(--muted);font-size:14px;overflow-wrap:anywhere}.search-add.primary{width:auto;padding:10px 18px;font-size:15px;min-height:44px}

.course-states{display:flex;gap:8px;margin:12px 0 16px}.course-states button{border:1px solid #d5deed;border-radius:999px;padding:8px 16px;background:#fff;font-size:14px;min-height:40px;color:#596a87}.course-states button[aria-pressed="true"]{background:#edf3fb;color:#214a99;border-color:#a7bedf;font-weight:600}.course-badge{display:inline-block;font-size:11px;font-weight:500;padding:2px 7px;line-height:1.5;border-radius:6px;color:#476385;background:#edf3fb;margin-left:8px;vertical-align:middle}.product-link{font-size:13px;text-decoration:none}.rank-actions{min-width:95px}