:root{--primary-color:#1976d2;--primary-light:#63a4ff;--primary-dark:#004ba0;--secondary-color:#f50057;--text-color:#333;--light-text:#666;--background-color:#fff;--light-gray:#f5f5f5;--border-color:#e0e0e0;--success-color:#4caf50;--error-color:#f44336;--warning-color:#ff9800;--info-color:#2196f3}*{box-sizing:border-box;margin:0;padding:0}body,html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;font-size:16px;color:var(--text-color);background-color:var(--background-color);line-height:1.6}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer;border:none;background:none;font-family:inherit;font-size:inherit}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background-color:var(--primary-color);color:#fff;box-shadow:0 2px 4px rgba(0,0,0,.1)}.header-logo h1{font-size:1.5rem;font-weight:600}.header-user{display:flex;align-items:center;gap:1rem}.user-email{font-size:.9rem}.logout-button{padding:.5rem 1rem;background-color:hsla(0,0%,100%,.2);color:#fff;border-radius:4px;transition:background-color .3s}.logout-button:hover{background-color:hsla(0,0%,100%,.3)}.app-content{display:flex;flex:1 1}.app-sidebar{width:300px;border-right:1px solid var(--border-color);background-color:var(--light-gray);overflow-y:auto}.app-main{flex:1 1;padding:2rem;overflow-y:auto}.navigation{display:flex;flex-direction:column;height:100%}.navigation-header{padding:1.5rem 1rem;border-bottom:1px solid var(--border-color)}.navigation-header h2{font-size:1.2rem;font-weight:600}.navigation-search{padding:1rem;border-bottom:1px solid var(--border-color)}.search-input{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:4px;font-size:.9rem}.navigation-menu{flex:1 1;overflow-y:auto}.navigation-menu ul{list-style:none}.navigation-menu li{padding:.75rem 1rem;border-bottom:1px solid var(--border-color);transition:background-color .3s}.navigation-menu li:hover{background-color:rgba(25,118,210,.1)}.navigation-menu li.active{background-color:rgba(25,118,210,.2);border-left:4px solid var(--primary-color)}.navigation-menu a{display:block;color:var(--text-color);text-decoration:none}.document-viewer{max-width:900px;margin:0 auto}.document-message{padding:2rem;text-align:center;color:var(--light-text)}.document-error{color:var(--error-color)}.markdown-viewer{background-color:#fff;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.1);overflow:hidden}.markdown-toolbar{display:flex;justify-content:flex-end;padding:1rem;background-color:var(--light-gray);border-bottom:1px solid var(--border-color)}.export-pdf-button{padding:.5rem 1rem;background-color:var(--primary-color);color:#fff;border-radius:4px;font-weight:500;transition:background-color .3s}.export-pdf-button:hover{background-color:var(--primary-dark)}.markdown-content{padding:2rem}.markdown-content h1{font-size:2.2rem;margin-bottom:1.5rem}.markdown-content h1,.markdown-content h2{padding-bottom:.5rem;border-bottom:1px solid var(--border-color)}.markdown-content h2{font-size:1.8rem;margin-top:2rem;margin-bottom:1rem}.markdown-content h3{font-size:1.5rem;margin-top:1.5rem;margin-bottom:.75rem}.markdown-content h4{font-size:1.3rem;margin-top:1.25rem;margin-bottom:.5rem}.markdown-content p{margin-bottom:1rem}.markdown-content ol,.markdown-content ul{margin-bottom:1rem;padding-left:2rem}.markdown-content li{margin-bottom:.5rem}.markdown-content code{background-color:var(--light-gray);padding:.2rem .4rem;border-radius:3px;font-family:monospace;font-size:.9em}.markdown-content pre{background-color:var(--light-gray);padding:1rem;border-radius:4px;overflow-x:auto;margin-bottom:1rem}.markdown-content pre code{background-color:transparent;padding:0}.markdown-content blockquote{border-left:4px solid var(--primary-light);padding-left:1rem;margin-left:0;margin-bottom:1rem;color:var(--light-text)}.markdown-content img{max-width:100%;height:auto;margin:1rem 0;border-radius:4px}.markdown-content table{width:100%;border-collapse:collapse;margin-bottom:1rem}.markdown-content td,.markdown-content th{padding:.75rem;border:1px solid var(--border-color)}.markdown-content th{background-color:var(--light-gray);font-weight:600}.mermaid-diagram-container{margin:2rem 0;text-align:center;overflow-x:auto}.mermaid-diagram-container svg{max-width:100%;height:auto}.login-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background-color:var(--light-gray)}.login-card{width:100%;max-width:400px;padding:2rem;background-color:#fff;border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,.1)}.login-card h2{font-size:1.8rem;text-align:center;margin-bottom:.5rem;color:var(--primary-color)}.login-subtitle{text-align:center;color:var(--light-text);margin-bottom:2rem}.login-error{background-color:rgba(244,67,54,.1);color:var(--error-color);padding:.75rem;border-radius:4px;text-align:center}.login-error,.login-form{margin-bottom:1.5rem}.form-group{margin-bottom:1.25rem}.form-group label{display:block;margin-bottom:.5rem;font-weight:500}.form-group input{border:1px solid var(--border-color);font-size:1rem}.form-group input,.login-button{width:100%;padding:.75rem;border-radius:4px}.login-button{background-color:var(--primary-color);color:#fff;font-weight:500;margin-top:1rem;transition:background-color .3s}.login-button:hover{background-color:var(--primary-dark)}.login-divider{display:flex;align-items:center;margin:1.5rem 0}.login-divider:after,.login-divider:before{content:"";flex:1 1;height:1px;background-color:var(--border-color)}.login-divider span{padding:0 1rem;color:var(--light-text);font-size:.9rem}.google-login-button{width:100%;padding:.75rem;background-color:#fff;color:var(--text-color);border:1px solid var(--border-color);border-radius:4px;font-weight:500;transition:background-color .3s;display:flex;justify-content:center;align-items:center;gap:.5rem}.google-login-button:hover{background-color:var(--light-gray)}.loading-container{display:flex;justify-content:center;align-items:center;min-height:300px;font-size:1.2rem;color:var(--light-text)}