*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;background:#f3f6fa;color:#1d2b42}.app{display:flex;min-height:100vh}.sidebar{width:250px;background:#081c36;color:#fff;padding:20px 14px;position:fixed;top:0;bottom:0;left:0;overflow:auto}.brand{display:flex;gap:10px;align-items:center;margin-bottom:20px}.brand .logo{width:42px;height:42px;border-radius:50%;background:#d6aa2e;display:grid;place-items:center;color:#081c36;font-weight:900}.brand small{display:block;color:#b9c8da}.sidebar a{display:block;color:#dce7f4;text-decoration:none;padding:10px 12px;border-radius:8px;margin:4px 0}.sidebar a:hover{background:#14345d}.workspace{margin-left:250px;width:calc(100% - 250px)}.topbar{background:white;padding:16px 24px;border-bottom:1px solid #dde4ee;display:flex;justify-content:space-between;align-items:center}.content{padding:24px}.panel{background:white;border:1px solid #dfe5ed;border-radius:14px;padding:18px;margin-bottom:18px;box-shadow:0 8px 20px #0a1f3e0b}.page-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.page-head h1{margin:0;color:#0b2345}.page-head p{margin:5px 0;color:#68768a}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.span-2{grid-column:span 2}label{font-size:13px;font-weight:700;color:#33435a}input,select,textarea{width:100%;margin-top:5px;padding:11px;border:1px solid #ccd5e0;border-radius:8px;background:#fff}textarea{min-height:90px}button,.btn{background:#0b2345;color:#fff;border:0;padding:11px 16px;border-radius:8px;font-weight:700;cursor:pointer}.secondary{background:#edf2f8;color:#0b2345}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:10px;border-bottom:1px solid #e6ebf1;font-size:13px}th{color:#5c6a7d;background:#f8fafc}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}.stat{background:#fff;border:1px solid #dfe5ed;border-radius:14px;padding:18px}.stat span{display:block;color:#6b798b;font-size:12px}.stat strong{display:block;font-size:24px;color:#0b2345;margin-top:5px}.alert{padding:12px;border-radius:8px;margin-bottom:15px}.ok{background:#e8f8ee;color:#17663a}.bad{background:#ffeaea;color:#9c1d1d}.student-photo{width:45px;height:45px;border-radius:50%;object-fit:cover}.muted{color:#7a8798;font-size:12px}.login-body{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#071b35,#103d72)}.login-card{width:min(420px,92vw);background:#fff;padding:28px;border-radius:18px;box-shadow:0 18px 50px #0005}.login-card h1{color:#0b2345}.login-card button{width:100%;margin-top:10px}.logout{margin-top:20px;background:#ffffff10}
@media(max-width:800px){.sidebar{position:static;width:100%}.workspace{margin-left:0;width:100%}.app{display:block}.form-grid,.stats{grid-template-columns:1fr}.span-2{grid-column:auto}}