@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;600;700&display=swap";:root{--primary:#0ea5e9;--primary-dark:#0284c7;--primary-light:#38bdf8;--secondary:#10b981;--secondary-dark:#059669;--secondary-light:#34d399;--accent:#06b6d4;--bg-base:#f8fafc;--bg-card:#fff;--bg-card2:#f1f5f9;--bg-card3:#e2e8f0;--bg-hover:#f1f5f9;--bg-input:#fff;--glass:#ffffffb3;--glass-border:#0ea5e933;--glass-hover:#fff;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--text-inverse:#fff;--success:#10b981;--warning:#f59e0b;--error:#ef4444;--info:#3b82f6;--sent-bg:linear-gradient(135deg, #0ea5e9, #0284c7);--received-bg:#f1f5f9;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:28px;--radius-full:9999px;--shadow-sm:0 2px 12px #0000000a;--shadow-md:0 8px 32px #00000014;--shadow-lg:0 20px 60px #0000001f;--shadow-glow:0 0 40px #0ea5e926;--shadow-glow-green:0 0 40px #10b98126;--sidebar-width:300px;--header-height:64px;--transition:all .2s cubic-bezier(.4,0,.2,1);--transition-slow:all .4s cubic-bezier(.4,0,.2,1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{background:var(--bg-base);color:var(--text-primary);min-height:100vh;font-family:Inter,sans-serif;line-height:1.6;overflow-x:hidden}body:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(600px 400px at 20% 30%,#0ea5e90f 0%,#0000 70%),radial-gradient(500px 350px at 80% 70%,#10b9810f 0%,#0000 70%);width:200%;height:200%;position:fixed;top:-50%;left:-50%}#root{z-index:1;min-height:100vh;position:relative}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{border-radius:var(--radius-full);background:#0ea5e94d}::-webkit-scrollbar-thumb:hover{background:#0ea5e999}.app-layout{height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-card);border-right:1px solid var(--glass-border);height:100vh;transition:var(--transition);flex-direction:column;display:flex;position:relative;overflow:hidden}.sidebar:before{content:"";background:linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));background-size:200% 100%;height:3px;animation:4s infinite gradient-shift;position:absolute;top:0;left:0;right:0}@keyframes gradient-shift{0%,to{background-position:0%}50%{background-position:100%}}.sidebar-logo{border-bottom:1px solid var(--glass-border);align-items:center;gap:12px;padding:24px 20px 16px;display:flex}.sidebar-logo-icon{border-radius:var(--radius-md);background:linear-gradient(135deg, var(--primary), var(--secondary));width:44px;height:44px;box-shadow:var(--shadow-glow);flex-shrink:0;justify-content:center;align-items:center;font-size:22px;display:flex}.sidebar-logo-text h1{background:linear-gradient(135deg, var(--primary-light), var(--secondary-light));-webkit-text-fill-color:transparent;letter-spacing:-.3px;-webkit-background-clip:text;background-clip:text;font-family:Outfit,sans-serif;font-size:18px;font-weight:700}.sidebar-logo-text p{color:var(--text-muted);letter-spacing:.5px;font-size:11px}.sidebar-section-label{letter-spacing:1.5px;text-transform:uppercase;color:var(--text-muted);padding:16px 20px 8px;font-size:10px;font-weight:700}.sidebar-nav{flex:1;padding:8px 12px;overflow-y:auto}.nav-item{border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);color:var(--text-secondary);border:1px solid #0000;align-items:center;gap:12px;margin-bottom:3px;padding:11px 12px;text-decoration:none;display:flex;position:relative}.nav-item:hover{background:var(--glass-hover);color:var(--text-primary);border-color:var(--glass-border);transform:translate(3px)}.nav-item.active{color:var(--text-primary);background:linear-gradient(135deg,#0ea5e926,#10b9811a);border-color:#0ea5e94d;box-shadow:inset 0 0 20px #0ea5e90d}.nav-item.active .nav-icon-wrap{background:linear-gradient(135deg, var(--primary), var(--secondary));box-shadow:0 4px 12px #0ea5e966}.nav-icon-wrap{border-radius:var(--radius-sm);width:36px;height:36px;transition:var(--transition);background:#0000000a;flex-shrink:0;justify-content:center;align-items:center;font-size:18px;display:flex}.nav-info{flex:1;min-width:0}.nav-name{white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.nav-sub{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;margin-top:1px;font-size:11px;overflow:hidden}.nav-badge{border-radius:var(--radius-full);background:var(--primary);color:#fff;justify-content:center;align-items:center;min-width:20px;height:20px;padding:0 6px;font-size:11px;font-weight:700;animation:2s infinite pulse-badge;display:flex;box-shadow:0 2px 8px #0ea5e980}@keyframes pulse-badge{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.sidebar-footer{border-top:1px solid var(--glass-border);padding:12px}.user-card{border-radius:var(--radius-md);background:var(--glass);border:1px solid var(--glass-border);cursor:pointer;transition:var(--transition);align-items:center;gap:10px;padding:10px 12px;display:flex}.user-card:hover{background:var(--glass-hover)}.user-avatar{border-radius:var(--radius-full);object-fit:cover;border:2px solid var(--primary);flex-shrink:0;width:38px;height:38px;box-shadow:0 0 0 2px #0ea5e933}.user-avatar-placeholder{border-radius:var(--radius-full);background:linear-gradient(135deg, var(--primary), var(--secondary));flex-shrink:0;justify-content:center;align-items:center;width:38px;height:38px;font-size:16px;font-weight:700;display:flex}.user-info{flex:1;min-width:0}.user-name{white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.user-role{text-transform:capitalize;font-size:11px}.user-role.teacher{color:var(--primary-light)}.user-role.student{color:var(--secondary-light)}.user-role.assistant{color:var(--warning)}.logout-btn{border-radius:var(--radius-sm);color:#f87171;cursor:pointer;width:32px;height:32px;transition:var(--transition);background:#ef44441a;border:1px solid #ef444433;flex-shrink:0;justify-content:center;align-items:center;font-size:16px;display:flex}.logout-btn:hover{background:#ef444433;border-color:#ef444466}.main-content{flex-direction:column;flex:1;min-width:0;height:100vh;display:flex;overflow:hidden}.chat-header{height:var(--header-height);min-height:var(--header-height);background:var(--bg-card);border-bottom:1px solid var(--glass-border);z-index:10;align-items:center;gap:16px;padding:0 24px;display:flex;position:relative}.chat-header:after{content:"";background:linear-gradient(90deg, transparent, var(--primary), transparent);opacity:.3;height:1px;position:absolute;bottom:0;left:0;right:0}.chat-header-icon{border-radius:var(--radius-md);width:44px;height:44px;box-shadow:var(--shadow-sm);flex-shrink:0;justify-content:center;align-items:center;font-size:22px;display:flex}.chat-header-info{flex:1;min-width:0}.chat-header-title{letter-spacing:-.2px;font-size:16px;font-weight:700}.chat-header-sub{color:var(--text-secondary);align-items:center;gap:6px;margin-top:1px;font-size:12px;display:flex}.online-dot{background:var(--secondary);width:7px;height:7px;box-shadow:0 0 8px var(--secondary);border-radius:50%;animation:2s infinite pulse-online}@keyframes pulse-online{0%,to{opacity:1}50%{opacity:.5}}.chat-header-actions{align-items:center;gap:8px;display:flex}.icon-btn{border-radius:var(--radius-sm);background:var(--glass);border:1px solid var(--glass-border);width:36px;height:36px;color:var(--text-secondary);cursor:pointer;transition:var(--transition);justify-content:center;align-items:center;font-size:16px;display:flex}.icon-btn:hover{background:var(--glass-hover);color:var(--text-primary);border-color:var(--primary)}.chat-body{scroll-behavior:smooth;flex-direction:column;flex:1;gap:4px;padding:24px;display:flex;overflow-y:auto}.chat-empty{color:var(--text-muted);text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:16px;padding:40px;display:flex}.chat-empty-icon{opacity:.5;font-size:56px;animation:3s ease-in-out infinite float}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.chat-empty h3{color:var(--text-secondary);font-size:18px;font-weight:600}.chat-empty p{max-width:280px;font-size:14px;line-height:1.7}.date-divider{align-items:center;gap:12px;margin:16px 0 8px;display:flex}.date-divider-line{background:var(--glass-border);flex:1;height:1px}.date-divider-label{color:var(--text-muted);background:var(--bg-card3);border-radius:var(--radius-full);border:1px solid var(--glass-border);white-space:nowrap;padding:3px 12px;font-size:11px}.message-row{align-items:flex-end;gap:8px;animation:.3s cubic-bezier(.34,1.56,.64,1) msg-in;display:flex}@keyframes msg-in{0%{opacity:0;transform:translateY(12px)scale(.95)}to{opacity:1;transform:translateY(0)scale(1)}}.message-row.sent{flex-direction:row-reverse}.msg-avatar{border-radius:var(--radius-full);object-fit:cover;border:1px solid var(--glass-border);flex-shrink:0;align-self:flex-end;width:30px;height:30px}.msg-avatar-placeholder{border-radius:var(--radius-full);background:linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));flex-shrink:0;justify-content:center;align-items:center;width:30px;height:30px;font-size:12px;font-weight:700;display:flex}.msg-content{flex-direction:column;gap:2px;max-width:65%;display:flex}.message-row.sent .msg-content{align-items:flex-end}.msg-sender-name{color:var(--text-muted);margin-bottom:2px;padding:0 4px;font-size:11px}.msg-bubble{border-radius:var(--radius-lg);word-break:break-word;max-width:100%;padding:10px 14px;font-size:14px;line-height:1.6;position:relative}.msg-bubble.received{background:var(--bg-card3);border:1px solid var(--glass-border);color:var(--text-primary);border-bottom-left-radius:4px}.msg-bubble.sent{background:var(--sent-bg);color:#fff;border-bottom-right-radius:4px;box-shadow:0 4px 16px #0ea5e959}.msg-bubble.sent:hover{box-shadow:0 6px 20px #0ea5e980}.msg-image{border-radius:var(--radius-md);cursor:pointer;width:100%;max-width:240px;transition:var(--transition);display:block}.msg-image:hover{box-shadow:var(--shadow-md);transform:scale(1.02)}.msg-file-link{border-radius:var(--radius-sm);color:inherit;background:#ffffff1a;align-items:center;gap:8px;margin-top:4px;padding:8px 12px;font-size:13px;text-decoration:none;display:flex}.msg-file-link:hover{background:#fff3}.msg-meta{color:var(--text-muted);align-items:center;gap:4px;padding:0 4px;font-size:10px;display:flex}.message-row.sent .msg-meta{justify-content:flex-end}.msg-status{color:var(--secondary-light);font-size:12px}.chat-input-area{background:var(--bg-card);border-top:1px solid var(--glass-border);padding:16px 20px}.chat-input-container{background:var(--bg-input);border:1px solid var(--glass-border);border-radius:var(--radius-xl);transition:var(--transition);align-items:flex-end;gap:10px;padding:10px 14px 10px 16px;display:flex}.chat-input-container:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px #0ea5e91a}.media-preview{flex-wrap:wrap;gap:8px;padding:10px 0 0;display:flex}.media-preview-item{border-radius:var(--radius-md);border:1px solid var(--glass-border);flex-shrink:0;width:72px;height:72px;position:relative;overflow:hidden}.media-preview-item img{object-fit:cover;width:100%;height:100%}.media-preview-remove{border-radius:var(--radius-full);color:#fff;cursor:pointer;background:#000000b3;border:none;justify-content:center;align-items:center;width:18px;height:18px;font-size:12px;line-height:1;display:flex;position:absolute;top:3px;right:3px}.chat-textarea{color:var(--text-primary);resize:none;background:0 0;border:none;outline:none;flex:1;min-height:24px;max-height:120px;padding:2px 0;font-family:Inter,sans-serif;font-size:14px;line-height:1.5}.chat-textarea::placeholder{color:var(--text-muted)}.input-actions{flex-shrink:0;align-items:center;gap:6px;display:flex}.attach-btn{border-radius:var(--radius-md);border:1px solid var(--glass-border);width:34px;height:34px;color:var(--text-secondary);cursor:pointer;transition:var(--transition);background:0 0;justify-content:center;align-items:center;font-size:16px;display:flex}.attach-btn:hover{background:var(--glass-hover);color:var(--primary-light);border-color:var(--primary)}.send-btn{border-radius:var(--radius-full);background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;cursor:pointer;width:38px;height:38px;transition:var(--transition);border:none;flex-shrink:0;justify-content:center;align-items:center;font-size:16px;display:flex;box-shadow:0 4px 16px #0ea5e966}.send-btn:hover:not(:disabled){transform:scale(1.1);box-shadow:0 6px 20px #0ea5e999}.send-btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}.login-page{justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex;position:relative;overflow:hidden}.login-bg-orbs{pointer-events:none;position:absolute;inset:0;overflow:hidden}.orb{filter:blur(80px);border-radius:50%;animation:8s ease-in-out infinite orb-float;position:absolute}.orb-1{background:radial-gradient(circle,#0ea5e933 0%,#0000 70%);width:500px;height:500px;animation-delay:0s;top:-20%;left:-10%}.orb-2{background:radial-gradient(circle,#10b98126 0%,#0000 70%);width:400px;height:400px;animation-delay:3s;bottom:-10%;right:-10%}.orb-3{background:radial-gradient(circle,#06b6d41a 0%,#0000 70%);width:300px;height:300px;animation-delay:5s;top:50%;left:50%;transform:translate(-50%,-50%)}@keyframes orb-float{0%,to{transform:translate(0)scale(1)}33%{transform:translate(20px,-20px)scale(1.05)}66%{transform:translate(-15px,15px)scale(.95)}}.login-card{background:var(--bg-card);border:1px solid var(--glass-border);border-radius:var(--radius-xl);text-align:center;width:100%;max-width:440px;box-shadow:var(--shadow-lg), var(--shadow-glow);padding:48px 40px;position:relative;overflow:hidden}.login-card:before{content:"";background:linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));height:3px;position:absolute;top:0;left:0;right:0}.login-logo{border-radius:var(--radius-xl);background:linear-gradient(135deg, var(--primary), var(--secondary));width:72px;height:72px;box-shadow:var(--shadow-glow);justify-content:center;align-items:center;margin:0 auto 24px;font-size:32px;animation:3s ease-in-out infinite logo-pulse;display:flex}@keyframes logo-pulse{0%,to{box-shadow:0 0 30px #0ea5e94d}50%{box-shadow:0 0 60px #0ea5e999}}.login-title{background:linear-gradient(135deg, var(--primary-light), var(--secondary-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:8px;font-family:Outfit,sans-serif;font-size:28px;font-weight:700}.login-subtitle{color:var(--text-secondary);margin-bottom:32px;font-size:14px;line-height:1.7}.login-divider{align-items:center;gap:12px;margin:24px 0;display:flex}.login-divider-line{background:var(--glass-border);flex:1;height:1px}.login-divider-text{color:var(--text-muted);font-size:12px}.google-btn{border-radius:var(--radius-md);color:#374151;cursor:pointer;width:100%;transition:var(--transition);background:#fff;border:none;justify-content:center;align-items:center;gap:12px;padding:14px 20px;font-family:Inter,sans-serif;font-size:15px;font-weight:600;display:flex;box-shadow:0 4px 20px #0000004d}.google-btn:hover{transform:translateY(-2px);box-shadow:0 8px 28px #0006}.google-btn:active{transform:translateY(0)}.google-btn svg{width:20px;height:20px}.login-footer{color:var(--text-muted);margin-top:24px;font-size:12px;line-height:1.7}.login-features{grid-template-columns:1fr 1fr;gap:12px;margin-bottom:28px;display:grid}.login-feature{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius-md);text-align:center;padding:14px 12px}.login-feature-icon{margin-bottom:6px;font-size:22px}.login-feature-text{color:var(--text-secondary);font-size:11px;line-height:1.4}.welcome-screen{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:24px;padding:40px;display:flex}.welcome-title{background:linear-gradient(135deg, var(--primary-light), var(--secondary-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-family:Outfit,sans-serif;font-size:32px;font-weight:700}.welcome-sub{color:var(--text-secondary);max-width:360px;font-size:15px;line-height:1.8}.units-grid{grid-template-columns:repeat(3,1fr);gap:16px;max-width:540px;margin-top:8px;display:grid}.unit-card{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius-lg);cursor:pointer;transition:var(--transition);text-align:center;color:var(--text-primary);padding:20px 12px;text-decoration:none;display:block}.unit-card:hover{background:var(--glass-hover);border-color:var(--primary);box-shadow:var(--shadow-md), var(--shadow-glow);transform:translateY(-4px)}.unit-card-icon{margin-bottom:8px;font-size:28px}.unit-card-code{color:var(--primary-light);font-size:15px;font-weight:700}.unit-card-name{color:var(--text-muted);margin-top:2px;font-size:10px;line-height:1.4}.student-list{flex:1;padding:0;overflow-y:auto}.student-item{border-bottom:1px solid var(--glass-border);cursor:pointer;transition:var(--transition);align-items:center;gap:12px;padding:14px 20px;display:flex}.student-item:hover{background:var(--glass-hover)}.student-item.active{background:linear-gradient(135deg,#0ea5e91a,#10b9810d)}.student-item-info{flex:1;min-width:0}.student-item-name{font-size:14px;font-weight:600}.student-item-last{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.notification-toast{background:var(--bg-card2);border:1px solid var(--primary);border-radius:var(--radius-lg);max-width:340px;box-shadow:var(--shadow-lg), var(--shadow-glow);z-index:1000;cursor:pointer;align-items:flex-start;gap:12px;padding:16px 20px;animation:.4s cubic-bezier(.34,1.56,.64,1) toast-in;display:flex;position:fixed;bottom:24px;right:24px}@keyframes toast-in{0%{opacity:0;transform:translateY(20px)scale(.9)}to{opacity:1;transform:translateY(0)scale(1)}}.toast-icon{flex-shrink:0;font-size:24px}.toast-content{flex:1}.toast-title{color:var(--primary-light);margin-bottom:2px;font-size:14px;font-weight:700}.toast-body{color:var(--text-secondary);font-size:13px;line-height:1.5}.toast-close{color:var(--text-muted);cursor:pointer;background:0 0;border:none;font-size:16px;line-height:1}.toast-close:hover{color:var(--text-primary)}.loading-screen{background:var(--bg-base);z-index:9999;flex-direction:column;justify-content:center;align-items:center;gap:24px;display:flex;position:fixed;inset:0}.spinner{border:3px solid var(--glass-border);border-top-color:var(--primary);border-radius:50%;width:48px;height:48px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{color:var(--text-muted);letter-spacing:.5px;font-size:14px}.assistant-hero{border:1px solid var(--glass-border);border-radius:var(--radius-xl);text-align:center;background:linear-gradient(135deg,#0ea5e91a,#10b98114);margin-bottom:24px;padding:28px 24px}.assistant-hero-icon{margin-bottom:12px;font-size:44px}.assistant-title{background:linear-gradient(135deg, var(--warning), #fbbf24);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:6px;font-family:Outfit,sans-serif;font-size:24px;font-weight:700}.assistant-sub{color:var(--text-secondary);font-size:13px}.assistant-team{gap:16px;margin-bottom:24px;padding:0 24px;display:flex}.assistant-card{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--radius-lg);text-align:center;transition:var(--transition);cursor:pointer;flex:1;padding:18px 16px}.assistant-card:hover{background:var(--glass-hover);border-color:var(--warning);transform:translateY(-3px)}.assistant-card-avatar{border-radius:var(--radius-full);background:linear-gradient(135deg,#f59e0b,#d97706);justify-content:center;align-items:center;width:52px;height:52px;margin:0 auto 12px;font-size:22px;display:flex;box-shadow:0 4px 16px #f59e0b4d}.assistant-card-name{margin-bottom:4px;font-size:13px;font-weight:700}.assistant-card-email{color:var(--text-muted);font-size:11px}.lightbox{z-index:2000;cursor:zoom-out;background:#000000e6;justify-content:center;align-items:center;padding:20px;animation:.2s fade-in;display:flex;position:fixed;inset:0}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.lightbox img{border-radius:var(--radius-lg);max-width:90vw;max-height:90vh;box-shadow:var(--shadow-lg);object-fit:contain}.lightbox-close{border-radius:var(--radius-full);color:#fff;cursor:pointer;width:40px;height:40px;transition:var(--transition);background:#ffffff1a;border:1px solid #fff3;justify-content:center;align-items:center;font-size:20px;display:flex;position:fixed;top:20px;right:24px}.lightbox-close:hover{background:#fff3}@media (width<=768px){:root{--sidebar-width:260px}.sidebar{z-index:100;position:fixed;top:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.units-grid{grid-template-columns:repeat(2,1fr)}}