:root{--paper:#f4f4ef;--ink:#101112;--acid:#dfff00;--line:#d4d4cc;--muted:#73746b;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a{cursor:pointer}button{border:1px solid var(--line);background:transparent;padding:11px 16px;color:var(--ink)}button:hover{background:#e9e9df}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid #737f00;outline-offset:3px}button:disabled{opacity:.4;cursor:default}.primary{background:var(--acid);border-color:var(--ink)}.primary:hover{background:#cce900}input{width:100%;padding:13px;border:1px solid var(--line);background:#fff}label{display:grid;gap:9px;font-size:13px}h1,h2,p{margin-top:0}.muted{color:var(--muted)}.small{font-size:12px;line-height:1.7}.badge{background:var(--acid);padding:6px 9px;font-size:11px;letter-spacing:1px}.brand{font-weight:800;font-size:20px;letter-spacing:0}.mark{display:inline-grid;place-items:center;background:var(--acid);color:var(--ink);width:32px;height:32px;margin-right:10px}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--line);gap:20px}.topbar a{color:inherit;text-decoration:none;font-size:13px}.login{min-height:calc(100vh - 76px);display:grid;grid-template-columns:1.1fr 1fr}.intro{background:var(--ink);color:var(--paper);padding:72px 10%;display:flex;flex-direction:column;justify-content:space-between}.intro h1{font-size:64px;font-weight:500;letter-spacing:0;line-height:1.15;margin:30px 0}.intro h1 em{color:var(--acid);font-style:normal}.intro p{color:#bdbeb5;line-height:1.9}.login-panel{display:grid;place-items:center;padding:48px}.login-card{width:100%;max-width:370px}.login-card h2{font-size:32px;letter-spacing:0;margin:24px 0 12px}form{display:grid;gap:22px;margin-top:32px}.password-wrap{display:flex}.password-wrap button{white-space:nowrap;font-size:12px;border-left:0}.error{color:#a83221;font-size:13px;min-height:20px;margin:0;line-height:1.6}.login-card .primary{padding:15px}.demo-note{border-top:1px solid var(--line);padding-top:20px;margin-top:30px}.admin-shell{display:grid;grid-template-columns:300px 1fr;min-height:calc(100vh - 76px)}.sidebar{border-right:1px solid var(--line);padding:28px 22px;background:#edede6}.sidebar h2{font-size:22px;margin:18px 0}.search{margin:20px 0 12px}.student-list{display:grid;gap:8px;margin-top:20px}.student-item{text-align:left;padding:16px;background:transparent;width:100%}.student-item strong{display:block;font-size:15px;margin-bottom:8px}.student-item small{font-size:12px;color:var(--muted)}.student-item.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}.student-item.active small{color:#c3c5b8}.admin-main{min-width:0}.student-heading{padding:28px 32px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px}.student-heading h1{font-size:28px;margin:0 0 8px}.actions{display:flex;gap:8px;flex-wrap:wrap}iframe{display:block;width:100%;height:calc(100vh - 235px);min-height:600px;border:0;background:var(--paper)}.empty{padding:50px;color:var(--muted);text-align:center}.notice{background:#e8e8dd;font-size:12px;padding:10px 32px;color:#55574c;line-height:1.7}dialog{background:var(--paper);color:var(--ink);border:1px solid var(--ink);width:440px;max-width:calc(100% - 32px);padding:28px}dialog::backdrop{background:#10111280}dialog h2{font-size:25px}.dialog-actions{display:flex;justify-content:flex-end;gap:10px}.student-home{max-width:1400px;margin:auto}.welcome{padding:36px 28px}.welcome h1{font-size:36px;letter-spacing:0;margin:18px 0 10px}.welcome p{font-size:14px;color:var(--muted)}.student-home iframe{height:calc(100vh - 290px);min-height:650px}.status-dot{width:7px;height:7px;display:inline-block;background:#798700;margin-right:7px}.desktop-only{display:none}[hidden]{display:none!important}@media(max-width:900px){.admin-shell{grid-template-columns:260px 1fr}.student-heading{align-items:flex-start;flex-direction:column}.admin-body .desktop-only{display:block;padding:16px 24px;background:var(--acid)}.intro{padding:50px 8%}.login-panel{padding:32px}}@media(max-width:600px){.topbar{padding:0 20px;height:65px}.brand{font-size:17px}.login{display:block;min-height:calc(100vh - 65px)}.intro{padding:30px 24px}.intro h1{font-size:35px;letter-spacing:0;margin:20px 0}.intro p{display:none}.intro .small{display:none}.login-panel{padding:32px 24px}.login-card h2{font-size:28px}.login-card{max-width:none}.welcome{padding:26px 20px 14px}.welcome h1{font-size:29px}.student-home iframe{min-height:750px}.notice{padding:10px 20px}.topbar button{padding:8px 12px;font-size:12px}.admin-body .admin-shell{display:block}.admin-body .sidebar{border-right:0;border-bottom:1px solid var(--line)}.admin-body .student-list{max-height:240px;overflow:auto}.intro h1{font-size:35px}}
@media(min-width:601px){.admin-body .student-list{max-height:calc(100vh - 350px);overflow-y:auto}}