:root{--color-primary:#6366f1;--color-primary-hover:#4f46e5;--color-primary-light:#e0e7ff;--color-success:#22c55e;--color-warning:#f59e0b;--color-danger:#ef4444;--color-info:#3b82f6;--color-bg:#fff;--color-bg-secondary:#f8fafc;--color-bg-tertiary:#f1f5f9;--color-text:#1e293b;--color-text-secondary:#64748b;--color-text-muted:#94a3b8;--color-border:#e2e8f0;--color-border-hover:#cbd5e1;--spacing-xs:.25rem;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--font-family:'Inter' , -apple-system , BlinkMacSystemFont , 'Segoe UI' , Roboto , sans-serif;--font-size-xs:.75rem;--font-size-sm:.875rem;--font-size-base:1rem;--font-size-lg:1.125rem;--font-size-xl:1.25rem;--font-size-2xl:1.5rem;--font-size-3xl:2rem;--radius-sm:.25rem;--radius-md:.5rem;--radius-lg:.75rem;--radius-xl:1rem;--radius-full:9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);--transition-fast:150ms ease;--transition-normal:200ms ease;--transition-slow:300ms ease;--z-dropdown:100;--z-sticky:200;--z-modal:300;--z-toast:400}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family: var(--font-family);font-size:var(--font-size-base);line-height:1.6;color:var(--color-text);background-color:var(--color-bg);min-height:100vh}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3;margin-bottom:var(--spacing-md)}h1{font-size:var(--font-size-3xl)}h2{font-size:var(--font-size-2xl)}h3{font-size:var(--font-size-xl)}h4{font-size:var(--font-size-lg)}p{margin-bottom:var(--spacing-md)}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-hover)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg)}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-lg);font-family:inherit;font-size:var(--font-size-sm);font-weight:500;line-height:1.5;border:1px solid transparent;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);text-decoration:none}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled) {background-color:var(--color-primary-hover)}.btn-secondary{background-color:var(--color-bg-secondary);border-color:var(--color-border);color:var(--color-text)}.btn-secondary:hover:not(:disabled) {background-color:var(--color-bg-tertiary);border-color:var(--color-border-hover)}.btn-danger{background-color:var(--color-danger);color:#fff}.btn-danger:hover:not(:disabled) {background-color:#dc2626}.btn-lg{padding:var(--spacing-md) var(--spacing-xl);font-size:var(--font-size-base)}.btn-sm{padding:var(--spacing-xs) var(--spacing-md);font-size:var(--font-size-xs)}.form-group{margin-bottom:var(--spacing-lg)}.form-label{display:block;margin-bottom:var(--spacing-sm);font-size:var(--font-size-sm);font-weight:500;color:var(--color-text)}.form-input,.form-textarea,.form-select{width:100%;padding:var(--spacing-sm) var(--spacing-md);font-family:inherit;font-size:var(--font-size-base);line-height:1.5;color:var(--color-text);background-color:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-md);transition:border-color var(--transition-fast) , box-shadow var(--transition-fast)}.form-input:focus,.form-textarea:focus,.form-select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.form-input::placeholder{color:var(--color-text-muted)}.form-textarea{min-height:100px;resize:vertical}.form-error{margin-top:var(--spacing-xs);font-size:var(--font-size-sm);color:var(--color-danger)}.card{background-color:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.card-header{padding:var(--spacing-lg);border-bottom:1px solid var(--color-border)}.card-body{padding:var(--spacing-lg)}.card-footer{padding:var(--spacing-lg);border-top:1px solid var(--color-border);background-color:var(--color-bg-secondary);border-radius:0 0 var(--radius-lg) var(--radius-lg)}.loading-screen{position:fixed;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background-color:var(--color-bg);z-index:var(--z-modal)}.loading-spinner{width:40px;height:40px;border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin {
    to { transform: rotate(360deg); }
}.loading-screen p{margin-top:var(--spacing-md);color:var(--color-text-secondary)}.alert{padding:var(--spacing-md) var(--spacing-lg);border-radius:var(--radius-md);margin-bottom:var(--spacing-md)}.alert-success{background-color:#dcfce7;color:#166534;border:1px solid #bbf7d0}.alert-warning{background-color:#fef3c7;color:#92400e;border:1px solid #fde68a}.alert-danger{background-color:#fee2e2;color:#991b1b;border:1px solid #fecaca}.alert-info{background-color:#dbeafe;color:#1e40af;border:1px solid #bfdbfe}.badge{display:inline-flex;align-items:center;padding:var(--spacing-xs) var(--spacing-sm);font-size:var(--font-size-xs);font-weight:500;border-radius:var(--radius-full)}.badge-primary{background-color:var(--color-primary-light);color:var(--color-primary)}.badge-success{background-color:#dcfce7;color:#166534}.badge-warning{background-color:#fef3c7;color:#92400e}.badge-danger{background-color:#fee2e2;color:#991b1b}.text-center{text-align:center}.text-right{text-align:right}.text-muted{color:var(--color-text-secondary)}.text-sm{font-size:var(--font-size-sm)}.text-xs{font-size:var(--font-size-xs)}.mt-sm{margin-top:var(--spacing-sm)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}.mb-sm{margin-bottom:var(--spacing-sm)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.hidden{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.text-success{color:var(--color-success)}.text-danger{color:var(--color-danger)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background-color:var(--color-bg-secondary);padding:var(--spacing-lg)}.auth-card{width:100%;max-width:420px}.auth-divider{display:flex;align-items:center;margin:var(--spacing-lg) 0;color:var(--color-text-muted);font-size:var(--font-size-sm)}.auth-divider::before,.auth-divider::after{content:'';flex:1;height:1px;background-color:var(--color-border)}.auth-divider span{padding:0 var(--spacing-md)}.btn-google{background-color:var(--color-bg);border:1px solid var(--color-border);color:var(--color-text);font-weight:500}.btn-google:hover:not(:disabled) {background-color:var(--color-bg-secondary);border-color:var(--color-border-hover)}.btn-google svg{margin-right:var(--spacing-sm)}.landing-page{min-height:100vh;display:flex;flex-direction:column}.landing-header{padding:var(--spacing-lg) 0;border-bottom:1px solid var(--color-border)}.landing-header .logo{font-size:var(--font-size-xl);font-weight:700;color:var(--color-primary);margin:0}.landing-main{flex:1;display:flex;align-items:center;justify-content:center;padding:var(--spacing-2xl) 0}.landing-main h2{font-size:var(--font-size-3xl);margin-bottom:var(--spacing-md)}.landing-main p{font-size:var(--font-size-lg);max-width:600px;margin:0 auto var(--spacing-lg)}.error-page{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-lg)}.error-page h1{font-size:6rem;color:var(--color-text-muted);margin-bottom:var(--spacing-sm)}.chat-layout{display:flex;height:100vh}.chat-sidebar{width:280px;display:flex;flex-direction:column;background-color:var(--color-bg-secondary);border-right:1px solid var(--color-border)}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);border-bottom:1px solid var(--color-border)}.sidebar-header h3{font-size:var(--font-size-lg);color:var(--color-primary);margin:0}.conversation-list{flex:1;overflow-y:auto;padding:var(--spacing-md)}.conversation-item{display:flex;flex-direction:column;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);cursor:pointer;transition:background-color var(--transition-fast)}.conversation-item:hover{background-color:var(--color-bg-tertiary)}.conversation-title{font-size:var(--font-size-sm);font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conversation-date{color:var(--color-text-muted)}.sidebar-footer{display:flex;gap:var(--spacing-sm);padding:var(--spacing-md);border-top:1px solid var(--color-border)}.sidebar-footer .btn{flex:1}.chat-main{flex:1;display:flex;flex-direction:column;background-color:var(--color-bg)}.chat-messages{flex:1;overflow-y:auto;padding:var(--spacing-lg)}.chat-welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--color-text-secondary)}.chat-welcome h2{color:var(--color-text);margin-bottom:var(--spacing-sm)}.message{display:flex;gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.message-user{flex-direction:row-reverse}.message-avatar{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-full);background-color:var(--color-bg-tertiary);font-size:var(--font-size-xs);font-weight:600;flex-shrink:0}.message-user .message-avatar{background-color:var(--color-primary);color:#fff}.message-content{max-width:80%;padding:var(--spacing-md);border-radius:var(--radius-lg);background-color:var(--color-bg-secondary);line-height:1.6}.message-user .message-content{background-color:var(--color-primary);color:#fff}.message-content pre{background-color:var(--color-bg-tertiary);padding:var(--spacing-md);border-radius:var(--radius-md);overflow-x:auto;margin:var(--spacing-sm) 0}.message-user .message-content pre{background-color:rgba(255,255,255,.1)}.message-content code{font-family:'Fira Code',monospace;font-size:var(--font-size-sm)}.chat-input-area{padding:var(--spacing-lg);border-top:1px solid var(--color-border);background-color:var(--color-bg)}.chat-form{display:flex;gap:var(--spacing-md)}.chat-form textarea{flex:1;resize:none;max-height:150px}.dashboard-layout{min-height:100vh;background-color:var(--color-bg-secondary)}.dashboard-header{background-color:var(--color-bg);border-bottom:1px solid var(--color-border);padding:var(--spacing-md) 0}.dashboard-header h1{font-size:var(--font-size-xl);margin:0}.dashboard-main{padding:var(--spacing-xl) 0}.dashboard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:var(--spacing-lg)}.list-item{padding:var(--spacing-md);border-bottom:1px solid var(--color-border)}.list-item:last-child{border-bottom:none}@media (max-width:768px){.chat-layout{flex-direction:column}.chat-sidebar{width:100%;height:auto;max-height:40vh;border-right:none;border-bottom:1px solid var(--color-border)}.message-content{max-width:90%}.landing-header .container{flex-direction:column;gap:var(--spacing-md)}}