.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px}.loading-container.fullscreen{min-height:100vh}.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}.loading-text{margin-top:16px;color:var(--text-muted);font-size:14px}.navbar{background:var(--bg-card);border-bottom:1px solid var(--border);padding:0 24px;position:sticky;top:0;z-index:100}.navbar-container{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:64px}.navbar-logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:var(--text);text-decoration:none}.logo-icon{background:var(--primary);color:#fff;width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}.navbar-links{display:flex;align-items:center;gap:16px}.navbar-links a{color:var(--text-muted);font-size:14px;text-decoration:none;transition:color .2s}.navbar-links a:hover{color:var(--text)}.btn-logout{background:transparent;border:1px solid var(--border);color:var(--text-muted);padding:8px 16px;border-radius:8px;cursor:pointer;font-size:14px}.btn-logout:hover{border-color:var(--error);color:var(--error)}@media (max-width: 768px){.navbar-links{gap:10px}.navbar-links a:not(.btn-primary):not(.btn-outline){display:none}}.home-page{min-height:100vh}.hero{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - 64px);padding:60px 24px;background:linear-gradient(135deg,var(--bg) 0%,#1a1a3e 50%,var(--bg) 100%)}.hero-content{max-width:700px;text-align:center}.hero h1{font-size:clamp(32px,5vw,52px);font-weight:700;line-height:1.2;margin-bottom:20px;background:linear-gradient(135deg,var(--text) 0%,var(--primary-light) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero p{font-size:18px;color:var(--text-muted);margin-bottom:32px;line-height:1.7}.hero-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.features{padding:80px 24px;max-width:1100px;margin:0 auto}.features h2{text-align:center;font-size:32px;margin-bottom:48px}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;transition:transform .2s,border-color .2s}.feature-card:hover{transform:translateY(-4px);border-color:var(--primary)}.feature-icon{font-size:36px;display:block;margin-bottom:16px}.feature-card h3{font-size:20px;margin-bottom:10px}.feature-card p{color:var(--text-muted);font-size:14px}.auth-page{min-height:100vh;background:var(--bg)}.auth-container{display:flex;align-items:center;justify-content:center;padding:40px 20px;min-height:calc(100vh - 64px)}.auth-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:40px;width:100%;max-width:420px;box-shadow:var(--shadow)}.auth-card h1{font-size:24px;margin-bottom:8px}.auth-subtitle{color:var(--text-muted);font-size:14px;margin-bottom:24px}.forgot-link{display:block;text-align:right;font-size:13px;margin-bottom:20px}.auth-footer{text-align:center;margin-top:20px;font-size:14px;color:var(--text-muted)}.link-btn{background:none;border:none;color:var(--primary-light);cursor:pointer;font-size:14px;text-decoration:underline}@media (max-width: 480px){.auth-card{padding:24px}}.dashboard-page{min-height:100vh;background:radial-gradient(ellipse at top,rgba(99,102,241,.1) 0%,var(--bg) 45%)}.dashboard-container{max-width:1100px;margin:0 auto;padding:48px 24px}.dashboard-header{margin-bottom:48px}.dashboard-header h1{font-size:36px;margin-bottom:10px;background:linear-gradient(135deg,var(--text),var(--primary-light));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.dashboard-header p{color:var(--text-muted);font-size:16px}.dashboard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}.dashboard-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:32px;text-decoration:none;color:var(--text);transition:transform .25s,border-color .25s,box-shadow .25s;cursor:pointer}.dashboard-card:hover{transform:translateY(-6px);border-color:var(--primary);box-shadow:0 12px 32px #0000004d;text-decoration:none}.info-card{cursor:default;background:linear-gradient(135deg,var(--bg-card),rgba(99,102,241,.08))}.info-card:hover{transform:none;border-color:var(--border);box-shadow:none}.card-icon{font-size:40px;display:block;margin-bottom:18px}.dashboard-card h3{font-size:20px;margin-bottom:10px}.dashboard-card p{color:var(--text-muted);font-size:14px;margin-bottom:6px;line-height:1.6}.dashboard-card .card-cta{display:inline-block;margin-top:16px;font-size:13px;font-weight:600;color:var(--primary-light)}.chat-layout{display:flex;height:100vh;overflow:hidden;background:var(--bg)}.chat-sidebar{width:300px;background:linear-gradient(180deg,#151d2e 0%,var(--bg-card) 100%);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}.sidebar-top{padding:16px;border-bottom:1px solid var(--border)}.sidebar-brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:700;font-size:16px;margin-bottom:14px;transition:opacity .2s}.sidebar-brand:hover{opacity:.85;text-decoration:none}.brand-icon{width:32px;height:32px;background:linear-gradient(135deg,var(--primary),#a855f7);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800}.new-chat-btn{width:100%;padding:12px 14px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 14px #6366f159}.new-chat-btn:hover{transform:translateY(-1px);box-shadow:0 6px 20px #6366f173}.chat-list{flex:1;overflow-y:auto;padding:10px}.chat-list-empty{font-size:13px;color:var(--text-muted);text-align:center;padding:20px 10px}.chat-item{display:flex;align-items:center;gap:8px;padding:11px 12px;border-radius:10px;cursor:pointer;margin-bottom:4px;border:1px solid transparent;transition:background .2s,border-color .2s,transform .15s}.chat-item:hover{background:#ffffff0d;border-color:var(--border)}.chat-item.active{background:#6366f133;border-color:#6366f180}.chat-title{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}.chat-item-actions{display:flex;gap:2px;opacity:0;transition:opacity .2s}.chat-item:hover .chat-item-actions,.chat-item.active .chat-item-actions{opacity:1}.chat-action-btn{background:none;border:none;color:var(--text-muted);width:26px;height:26px;border-radius:6px;cursor:pointer;font-size:14px;transition:background .2s,color .2s}.chat-action-btn:hover{background:#ffffff1a;color:var(--text)}.chat-action-btn.delete:hover{color:var(--error)}.rename-input{width:100%;padding:6px 8px;background:var(--bg-input);border:1px solid var(--primary);border-radius:6px;color:var(--text);font-size:14px}.sidebar-footer{padding:12px 16px;border-top:1px solid var(--border);color:var(--text-muted);font-size:11px;text-align:center}.chat-main{flex:1;display:flex;flex-direction:column;min-width:0;background:radial-gradient(ellipse at top,rgba(99,102,241,.08) 0%,transparent 50%)}.chat-header{display:flex;align-items:center;gap:14px;padding:14px 24px;border-bottom:1px solid var(--border);background:#1e293bcc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.menu-btn{display:none;background:var(--bg-input);border:1px solid var(--border);color:var(--text);font-size:18px;cursor:pointer;padding:8px 12px;border-radius:8px;transition:background .2s}.menu-btn:hover{background:var(--border)}.chat-header-title{flex:1;min-width:0}.chat-header-title h2{font-size:17px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-header-meta{font-size:12px;color:var(--text-muted)}.profile-dropdown{position:relative}.profile-trigger{display:flex;align-items:center;gap:10px;padding:6px 12px 6px 6px;background:var(--bg-input);border:1px solid var(--border);border-radius:999px;color:var(--text);cursor:pointer;transition:border-color .2s,box-shadow .2s}.profile-trigger:hover{border-color:var(--primary);box-shadow:0 0 0 3px #6366f126}.profile-trigger-avatar,.profile-menu-avatar{width:32px;height:32px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#a855f7);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}.profile-trigger-name{font-size:14px;font-weight:500;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.profile-chevron{font-size:12px;color:var(--text-muted);transition:transform .2s}.profile-chevron.open{transform:rotate(180deg)}.profile-menu{position:absolute;top:calc(100% + 8px);right:0;width:240px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);padding:8px;z-index:300;animation:fadeIn .15s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.profile-menu-header{display:flex;align-items:center;gap:12px;padding:12px;border-bottom:1px solid var(--border);margin-bottom:4px}.profile-menu-header strong{display:block;font-size:14px}.profile-menu-header small{font-size:12px;color:var(--text-muted)}.profile-menu-item{display:block;width:100%;padding:10px 12px;text-align:left;background:none;border:none;border-radius:8px;color:var(--text);font-size:14px;cursor:pointer;text-decoration:none;transition:background .2s}.profile-menu-item:hover{background:var(--bg-input);text-decoration:none}.profile-menu-item.logout{color:var(--error);margin-top:4px;border-top:1px solid var(--border);border-radius:0 0 8px 8px;padding-top:14px}.messages-area{flex:1;overflow-y:auto;padding:24px;transition:background .2s}.messages-area.drag-over{background:#6366f114;outline:2px dashed var(--primary);outline-offset:-8px}.messages-list{max-width:820px;margin:0 auto}.welcome-screen{max-width:720px;margin:40px auto;text-align:center;padding:20px}.welcome-badge{display:inline-block;padding:6px 14px;background:#6366f126;border:1px solid rgba(99,102,241,.3);border-radius:999px;font-size:12px;font-weight:600;color:var(--primary-light);margin-bottom:20px}.welcome-screen h2{font-size:28px;margin-bottom:10px}.welcome-subtitle{color:var(--text-muted);font-size:15px;margin-bottom:32px;line-height:1.6}.suggestion-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;text-align:left}.suggestion-card{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:18px;cursor:pointer;transition:transform .2s,border-color .2s,box-shadow .2s;text-align:left}.suggestion-card:hover{transform:translateY(-3px);border-color:var(--primary);box-shadow:0 8px 24px #00000040}.suggestion-icon{font-size:24px;display:block;margin-bottom:10px}.suggestion-card h4{font-size:15px;margin-bottom:6px}.suggestion-card p{font-size:13px;color:var(--text-muted);line-height:1.5}.message{display:flex;gap:14px;margin-bottom:28px;animation:messageIn .3s ease}@keyframes messageIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.user-message{flex-direction:row-reverse}.message-avatar{flex-shrink:0}.avatar-label{width:38px;height:38px;border-radius:10px;background:var(--bg-input);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:var(--text-muted)}.avatar-label.ai{background:linear-gradient(135deg,#6366f14d,#a855f74d);border-color:#6366f166;color:var(--primary-light)}.user-message .avatar-label{background:var(--primary);border-color:var(--primary);color:#fff}.message-content{flex:1;min-width:0;max-width:85%}.user-message .message-content{display:flex;flex-direction:column;align-items:flex-end}.message-bubble{position:relative}.message-text{background:var(--bg-card);border:1px solid var(--border);padding:14px 18px;border-radius:16px 16px 16px 4px;font-size:14px;line-height:1.75}.user-message .message-text{background:linear-gradient(135deg,var(--primary),var(--primary-dark));border-color:transparent;border-radius:16px 16px 4px;color:#fff}.message-text p{margin:0 0 8px}.message-text p:last-child{margin-bottom:0}.message-text ul,.message-text ol{margin:8px 0;padding-left:20px}.message-text pre{background:var(--bg);padding:14px;border-radius:8px;overflow-x:auto;margin:10px 0;border:1px solid var(--border)}.message-text code{background:#00000040;padding:2px 6px;border-radius:4px;font-size:13px}.user-message .message-text code{background:#ffffff26}.message-image{max-width:280px;max-height:220px;border-radius:12px;margin-bottom:10px;object-fit:cover;border:1px solid var(--border)}.copy-btn{background:none;border:none;color:var(--text-muted);font-size:12px;cursor:pointer;margin-top:8px;padding:4px 8px;border-radius:6px;transition:color .2s,background .2s}.copy-btn:hover{color:var(--primary-light);background:#6366f11a}.typing-row{display:flex;gap:14px;margin-bottom:20px}.typing-bubble{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:14px 18px;display:flex;align-items:center;gap:12px}.typing-indicator{display:flex;gap:5px}.typing-indicator span{width:8px;height:8px;background:var(--primary-light);border-radius:50%;animation:typing 1.4s infinite}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}.typing-label{font-size:13px;color:var(--text-muted)}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.35}30%{transform:translateY(-5px);opacity:1}}.image-preview-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 24px;background:var(--bg-card);border-top:1px solid var(--border)}.preview-card{display:flex;align-items:center;gap:14px}.preview-card img{width:56px;height:56px;border-radius:10px;object-fit:cover;border:1px solid var(--border)}.preview-card strong{display:block;font-size:14px}.preview-card p{font-size:12px;color:var(--text-muted);margin:0}.preview-remove{background:#ef444426;color:var(--error);border:none;width:36px;height:36px;border-radius:50%;cursor:pointer;font-size:20px;transition:background .2s}.preview-remove:hover{background:#ef44444d}.input-area{display:flex;align-items:flex-end;gap:10px;padding:16px 24px 24px;max-width:868px;width:100%;margin:0 auto}.attach-btn{background:var(--bg-card);border:1px solid var(--border);color:var(--text-muted);width:44px;height:44px;border-radius:12px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;flex-shrink:0}.attach-btn:hover,.attach-btn.active{border-color:var(--primary);color:var(--primary-light);background:#6366f11a}.input-area textarea{flex:1;padding:14px 18px;background:var(--bg-card);border:1px solid var(--border);border-radius:14px;color:var(--text);font-size:14px;font-family:inherit;resize:none;max-height:140px;line-height:1.5;transition:border-color .2s,box-shadow .2s}.input-area textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #6366f126}.input-area textarea:disabled{opacity:.6}.send-btn{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;width:44px;height:44px;border-radius:12px;font-size:20px;font-weight:700;cursor:pointer;transition:transform .2s,box-shadow .2s;flex-shrink:0;display:flex;align-items:center;justify-content:center}.send-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #6366f166}.send-btn:disabled{opacity:.45;cursor:not-allowed}.send-spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.sidebar-overlay{display:none;border:none;padding:0;margin:0}@media (max-width: 768px){.chat-sidebar{position:fixed;left:-300px;top:0;height:100vh;z-index:200;transition:left .3s ease;box-shadow:4px 0 24px #0006}.chat-sidebar.open{left:0}.menu-btn{display:block}.profile-trigger-name{display:none}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;z-index:150;cursor:pointer}.suggestion-grid{grid-template-columns:1fr}.message-content{max-width:95%}.chat-header{padding:12px 16px}.messages-area{padding:16px}.input-area{padding:12px 16px 20px}}.profile-page{min-height:100vh}.profile-container{display:flex;justify-content:center;padding:40px 24px}.profile-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:40px;width:100%;max-width:480px;box-shadow:var(--shadow)}.profile-header{text-align:center;margin-bottom:32px}.profile-avatar{width:80px;height:80px;border-radius:50%;object-fit:cover;margin-bottom:16px}.profile-avatar.placeholder{background:var(--primary);display:inline-flex;align-items:center;justify-content:center;font-size:32px;font-weight:600;color:#fff}.profile-header h1{font-size:24px;margin-bottom:4px}.profile-header p{color:var(--text-muted);font-size:14px}.error-page{min-height:100vh}.error-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:calc(100vh - 64px);text-align:center;padding:24px}.error-container h1{font-size:120px;font-weight:700;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}.error-container p{font-size:20px;color:var(--text-muted);margin:16px 0 32px}:root{--primary: #6366f1;--primary-dark: #4f46e5;--primary-light: #818cf8;--bg: #0f172a;--bg-card: #1e293b;--bg-input: #334155;--text: #f1f5f9;--text-muted: #94a3b8;--border: #334155;--success: #22c55e;--error: #ef4444;--radius: 12px;--shadow: 0 4px 24px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}a{color:var(--primary-light);text-decoration:none}a:hover{text-decoration:underline}.btn-primary{display:inline-block;background:var(--primary);color:#fff;padding:10px 20px;border:none;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:background .2s;text-decoration:none;text-align:center}.btn-primary:hover{background:var(--primary-dark);text-decoration:none}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-outline{display:inline-block;background:transparent;color:var(--text);padding:10px 20px;border:1px solid var(--border);border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s;text-decoration:none;text-align:center}.btn-outline:hover{border-color:var(--primary);color:var(--primary-light);text-decoration:none}.btn-large{padding:14px 28px;font-size:16px}.btn-full{width:100%}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-size:14px;color:var(--text-muted)}.form-group input,.form-group textarea{width:100%;padding:12px 14px;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:14px;font-family:inherit;transition:border-color .2s}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--primary)}.error-msg{background:#ef444426;color:var(--error);padding:10px 14px;border-radius:8px;margin-bottom:16px;font-size:14px}.success-msg{background:#22c55e26;color:var(--success);padding:10px 14px;border-radius:8px;margin-bottom:16px;font-size:14px}