:root{--primary:#ff4d4d;--primary-glow:#ff4d4d26;--accent:#58a6ff;--success:#238636;--warning:#d29922;--bg-dark:#0d1117;--glass-bg:#1e1e23b3;--glass-border:#ffffff1a;--text-main:#e6edf3;--text-muted:#8b949e}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-dark);color:var(--text-main);font-family:Inter,sans-serif;line-height:1.6;overflow-x:hidden}.main-content{min-height:100vh;margin-left:280px;padding:40px;transition:all .3s}.exam-mode{min-height:100vh;margin-left:0;padding:0}.glass-panel{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:16px;box-shadow:0 8px 32px #0000004d}.sidebar-container{z-index:1000;width:280px;height:100vh;transition:transform .4s cubic-bezier(.4,0,.2,1);position:fixed;top:0;left:0}.sidebar{background:var(--glass-bg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--glass-border);border-radius:0 24px 24px 0;flex-direction:column;width:100%;height:100%;padding:32px 16px;display:flex;box-shadow:20px 0 50px #00000080}.sidebar-logo{border-left:4px solid var(--primary);margin-bottom:48px;padding:0 24px}.sidebar-logo h2{letter-spacing:2px;color:#fff;font-size:20px;font-weight:800}.sidebar-logo p{color:var(--text-muted);text-transform:uppercase;margin-top:4px;font-size:10px}.sidebar-nav{flex-direction:column;flex:1;gap:8px;display:flex}.sidebar-nav-item{color:var(--text-muted);border-radius:12px;padding:14px 24px;font-size:14px;font-weight:600;transition:all .2s;display:block;text-decoration:none!important}.sidebar-nav-item:hover{color:#fff;background:#ffffff0d}.sidebar-nav-item.active{background:var(--primary-glow);color:#fff;border:1px solid #ff4d4d4d}.sidebar-user{background:#0000004d;border-radius:16px;justify-content:space-between;align-items:center;margin-top:auto;padding:20px;display:flex}.sidebar-user .user-details strong{color:#fff;font-size:13px;display:block}.sidebar-user .user-details span{color:var(--text-muted);text-transform:uppercase;font-size:10px}.sidebar-user .logout-btn{border:1px solid var(--primary);color:var(--primary);cursor:pointer;background:#ff4d4d1a;border-radius:8px;padding:6px 12px;font-size:11px;font-weight:700;transition:all .2s}.sidebar-user .logout-btn:hover{background:var(--primary);color:#fff}.mobile-toggle{z-index:2000;background:var(--primary);cursor:pointer;border:none;border-radius:12px;justify-content:center;align-items:center;width:48px;height:48px;display:none;position:fixed;top:16px;left:16px;box-shadow:0 4px 15px #ff4d4d66}.hamburger{flex-direction:column;justify-content:space-between;width:24px;height:18px;display:flex;position:relative}.hamburger span{background:#fff;border-radius:2px;width:100%;height:2px;transition:all .3s;display:block}.mobile-toggle.open .hamburger span:first-child{transform:translateY(8px)rotate(45deg)}.mobile-toggle.open .hamburger span:nth-child(2){opacity:0}.mobile-toggle.open .hamburger span:nth-child(3){transform:translateY(-8px)rotate(-45deg)}.mobile-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:998;background:#0009;animation:.3s fadeIn;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@media (max-width:1024px){.main-content{margin-left:0;padding:80px 20px 20px}.sidebar-container{width:85%;max-width:300px;transform:translate(-100%)}.sidebar-container.mobile-open{transform:translate(0)}.mobile-toggle{display:flex}}.fade-in{animation:.5s ease-out fadeIn}.btn{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:10px;align-items:center;gap:8px;padding:12px 24px;font-weight:700;text-decoration:none;transition:all .2s;display:inline-flex}.btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px #ff4d4d66}.btn-secondary{color:#fff;border:1px solid var(--glass-border);cursor:pointer;background:#ffffff0d;border-radius:10px;padding:10px 20px;text-decoration:none}.modal-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:9999;background:#000000b3;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.assignment-modal{width:90%;max-width:700px;max-height:90vh;overflow-y:auto}.pagination{border-top:1px solid var(--glass-border);justify-content:center;gap:8px;margin-top:32px;padding-top:24px;display:flex}.page-btn{border:1px solid var(--glass-border);width:38px;height:38px;color:var(--text-muted);cursor:pointer;background:#ffffff0d;border-radius:10px;justify-content:center;align-items:center;font-size:14px;font-weight:600;transition:all .2s;display:flex}.page-btn:hover{color:#fff;background:#ffffff1a;transform:translateY(-2px)}.page-btn.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 4px 15px #fe4d4d4d}.input-field{border:1px solid var(--glass-border);color:#fff;background:#0003;border-radius:10px;outline:none;width:100%;padding:12px 16px;font-family:inherit;transition:all .2s}.input-field:focus{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary-glow)}.label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;font-size:12px;font-weight:600;display:block}.user-avatar-mini{border:2px solid var(--primary);background:#222;border-radius:50%;flex-shrink:0;width:36px;height:36px;overflow:hidden}.user-avatar-mini img{object-fit:cover;width:100%;height:100%}