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var(--border);border-radius:24px;width:100%;max-width:420px;padding:40px;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a}.auth-header{text-align:center;margin-bottom:32px}.auth-logo-wrapper{background:var(--bg-main);border:1px solid var(--border);border-radius:20px;justify-content:center;align-items:center;width:72px;height:72px;margin:0 auto 20px;padding:12px;display:flex;box-shadow:0 4px 6px -1px #0000000d}.auth-logo{object-fit:contain;width:100%;height:100%}.auth-header h1{letter-spacing:-.025em;margin-bottom:8px;font-size:28px;font-weight:700}.auth-header p{color:var(--text-muted);font-size:14px}.auth-form{flex-direction:column;gap:20px;display:flex}.form-group label{color:var(--text-main);font-size:14px;font-weight:600}.input-wrapper{align-items:center;display:flex;position:relative}.input-icon{color:var(--text-muted);position:absolute;left:12px}.input-wrapper input{border:1px solid 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cubic-bezier(.4,0,.2,1);display:flex;overflow-y:auto}.classroom-layout.sidebar-collapsed .classroom-main{margin-left:0}.sidebar-toggle-btn{z-index:50;background-color:var(--primary);color:#fff;border:3px solid var(--bg-card);cursor:pointer;border-radius:50%;outline:none;justify-content:center;align-items:center;width:40px;height:40px;transition:right .3s cubic-bezier(.4,0,.2,1),transform .2s,background-color .2s;display:flex;position:absolute;bottom:30px;right:-20px;box-shadow:0 4px 12px #6366f14d}.sidebar-toggle-btn:hover{background-color:var(--primary-hover);transform:scale(1.1)}.classroom-sidebar.collapsed .sidebar-toggle-btn{right:-40px}.session-list-container{flex-direction:column;flex:1;gap:12px;padding:20px;display:flex;overflow-y:auto}.session-item{border:1px solid var(--border);background:var(--bg-card);cursor:pointer;text-align:left;border-radius:16px;outline:none;align-items:center;gap:14px;width:100%;padding:14px 16px;transition:all .2s;display:flex;position:relative}.session-item:hover:not(.locked){border-color:var(--primary);background:#6366f105;transform:translateY(-1px)}.session-item.active{border-color:var(--primary);background:linear-gradient(135deg,#6366f10d 0%,#6366f103 100%);box-shadow:0 4px 12px #6366f10d}.session-item.locked{opacity:.65;cursor:not-allowed;background:var(--bg-main)}.session-icon-wrapper{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;display:flex}.session-icon-wrapper.completed{color:var(--success);background-color:#22c55e1a}.session-icon-wrapper.active{color:var(--primary);background-color:#6366f11a;box-shadow:0 0 0 4px #6366f114}.session-icon-wrapper.locked{background-color:var(--border);color:var(--text-muted)}.session-details{flex:1;min-width:0}.session-title-row{justify-content:space-between;align-items:center;gap:8px;margin-bottom:2px;display:flex}.session-title{color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;font-size:13.5px;font-weight:700;overflow:hidden}.session-date{color:var(--text-muted);background-color:var(--bg-main);white-space:nowrap;border-radius:6px;padding:2px 6px;font-size:11px;font-weight:600}.session-desc{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:11.5px;overflow:hidden}.active-pulse{background-color:var(--primary);border-radius:50%;width:8px;height:8px;animation:2s infinite pulse-glowing;position:absolute;top:6px;left:6px}@keyframes pulse-glowing{0%{opacity:.8;transform:scale(.9)}50%{opacity:1;box-shadow:0 0 8px var(--primary);transform:scale(1.3)}to{opacity:.8;transform:scale(.9)}}.classroom-bottom-nav{border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:16px;margin-top:auto;padding-top:24px;display:flex}.nav-session-btn{border:1px solid var(--border);background:var(--bg-card);color:var(--text-main);cursor:pointer;border-radius:12px;outline:none;align-items:center;gap:8px;padding:12px 20px;font-size:13.5px;font-weight:600;transition:all .2s;display:flex}.nav-session-btn:hover:not(:disabled){border-color:var(--primary);color:var(--primary);background:#6366f105}.nav-session-btn:disabled{opacity:.4;cursor:not-allowed}.nav-session-center{color:var(--text-muted);text-align:center;background-color:var(--bg-main);border:1px solid var(--border);border-radius:20px;padding:8px 16px;font-size:13.5px;font-weight:700}@media (width<=1024px){.classroom-sidebar{z-index:100;width:300px;position:fixed;top:0;bottom:0;left:0;transform:translate(-100%)}.classroom-sidebar.open{width:300px;transform:translate(0)}.classroom-sidebar.collapsed{width:300px;transform:translate(-100%)}.classroom-main{margin-left:0!important;padding:24px 16px 80px!important}.sidebar-toggle-btn{z-index:110!important}.classroom-bottom-nav{flex-direction:column;gap:12px}.nav-session-btn{justify-content:center;width:100%}.nav-session-center{order:-1;width:100%}}.coursera-reader{color:var(--text-main);text-align:left;background:#fff;padding:36px 40px;font-family:Outfit,Inter,sans-serif;line-height:1.9}@media (width<=768px){.coursera-reader{padding:24px 20px}}.whatsapp-button{color:#fff;z-index:999;background:#25d366;border-radius:50%;justify-content:center;align-items:center;width:60px;height:60px;text-decoration:none;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;position:fixed;bottom:30px;right:30px;box-shadow:0 4px 20px #25d36666}.whatsapp-button:hover{transform:scale(1.1);box-shadow:0 6px 24px #25d36680}.whatsapp-icon{margin:0;font-size:32px}@media (width<=768px){.whatsapp-button{width:50px;height:50px;bottom:20px;right:20px}.whatsapp-icon{font-size:26px}}