@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--color-primary:#4f6bf6;--color-primary-hover:#3a56e0;--color-primary-light:#e8ecfe;--color-primary-subtle:#f4f6ff;--color-accent:#10b981;--color-accent-hover:#059669;--color-warning:#f59e0b;--color-danger:#ef4444;--color-danger-hover:#dc2626;--color-bg:#0f1117;--color-bg-elevated:#181b25;--color-bg-card:#1e2230;--color-bg-card-hover:#252a3a;--color-bg-input:#252a3a;--color-bg-overlay:#0009;--color-border:#2a2f40;--color-border-hover:#3a4060;--color-border-active:var(--color-primary);--color-text:#f0f2f5;--color-text-secondary:#9ca3af;--color-text-tertiary:#6b7280;--color-text-on-primary:#fff;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #00000040;--shadow-lg:0 8px 32px #00000059;--shadow-glow:0 0 20px #4f6bf626;--spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--spacing-2xl:48px;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--transition-fast:.15s ease;--transition-base:.25s ease;--transition-slow:.4s ease;--sidebar-width:260px;--topbar-height:64px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);min-height:100vh;line-height:1.6}a{color:var(--color-primary);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--color-primary-hover)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-border-hover)}.app-layout{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--color-bg-elevated);border-right:1px solid var(--color-border);z-index:100;transition:transform var(--transition-base);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0}.sidebar-header{padding:var(--spacing-lg);border-bottom:1px solid var(--color-border);align-items:center;gap:var(--spacing-sm);display:flex}.sidebar-logo{background:linear-gradient(135deg, var(--color-primary), #8b5cf6);border-radius:var(--radius-sm);color:#fff;justify-content:center;align-items:center;width:32px;height:32px;font-size:14px;font-weight:800;display:flex}.sidebar-brand{flex-direction:column;display:flex}.sidebar-brand-name{color:var(--color-text);font-size:15px;font-weight:700;line-height:1.2}.sidebar-brand-sub{color:var(--color-text-tertiary);font-size:11px;font-weight:500}.sidebar-nav{padding:var(--spacing-md);gap:var(--spacing-xs);flex-direction:column;flex:1;display:flex;overflow-y:auto}.sidebar-link{align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);color:var(--color-text-secondary);transition:all var(--transition-fast);cursor:pointer;text-align:left;background:0 0;border:none;width:100%;font-size:14px;font-weight:500;display:flex}.sidebar-link:hover{background:var(--color-bg-card);color:var(--color-text)}.sidebar-link.active{background:var(--color-primary-light);color:var(--color-primary);background:#4f6bf61f}.sidebar-link svg{flex-shrink:0;width:18px;height:18px}.sidebar-section-label{color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.08em;padding:var(--spacing-md) var(--spacing-md) var(--spacing-xs);font-size:11px;font-weight:600}.sidebar-footer{padding:var(--spacing-md);border-top:1px solid var(--color-border)}.sidebar-user{align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm);border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast);display:flex}.sidebar-user:hover{background:var(--color-bg-card)}.sidebar-avatar{border-radius:var(--radius-full);object-fit:cover;background:var(--color-bg-card);width:32px;height:32px}.sidebar-user-info{flex:1;min-width:0}.sidebar-user-name{color:var(--color-text);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.sidebar-user-email{color:var(--color-text-tertiary);white-space:nowrap;text-overflow:ellipsis;font-size:11px;overflow:hidden}.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh}.page-container{max-width:1200px;padding:var(--spacing-xl) var(--spacing-xl);margin:0 auto}.page-header{margin-bottom:var(--spacing-xl)}.page-title{color:var(--color-text);letter-spacing:-.02em;font-size:28px;font-weight:800}.page-subtitle{color:var(--color-text-secondary);margin-top:var(--spacing-xs);font-size:15px}.btn{justify-content:center;align-items:center;gap:var(--spacing-sm);font-family:var(--font-sans);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;border:none;padding:10px 20px;font-size:14px;font-weight:600;display:inline-flex}.btn svg{width:18px;height:18px}.btn-primary{background:var(--color-primary);color:var(--color-text-on-primary);box-shadow:var(--shadow-sm)}.btn-primary:hover{background:var(--color-primary-hover);box-shadow:var(--shadow-glow);transform:translateY(-1px)}.btn-secondary{background:var(--color-bg-card);color:var(--color-text);border:1px solid var(--color-border)}.btn-secondary:hover{background:var(--color-bg-card-hover);border-color:var(--color-border-hover)}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:hover{background:var(--color-danger-hover)}.btn-ghost{color:var(--color-text-secondary);background:0 0}.btn-ghost:hover{background:var(--color-bg-card);color:var(--color-text)}.btn-sm{padding:6px 12px;font-size:13px}.btn-lg{padding:14px 28px;font-size:16px}.btn-icon{border-radius:var(--radius-sm);padding:8px}.btn-google{color:#1f1f1f;gap:var(--spacing-md);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);background:#fff;border:1px solid #dadce0;padding:12px 24px;font-size:15px;font-weight:500}.btn-google:hover{box-shadow:var(--shadow-md);background:#f8f9fa;transform:translateY(-1px)}.btn-google img{width:20px;height:20px}.card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);transition:all var(--transition-fast)}.card:hover{border-color:var(--color-border-hover);box-shadow:var(--shadow-md)}.card-clickable{cursor:pointer}.card-clickable:hover{border-color:var(--color-primary);box-shadow:var(--shadow-glow);transform:translateY(-2px)}.badge{border-radius:var(--radius-full);align-items:center;gap:4px;padding:3px 10px;font-size:12px;font-weight:600;display:inline-flex}.badge-primary{color:var(--color-primary);background:#4f6bf626}.badge-success{color:var(--color-accent);background:#10b98126}.badge-warning{color:var(--color-warning);background:#f59e0b26}.badge-neutral{background:var(--color-bg-input);color:var(--color-text-secondary)}.input{background:var(--color-bg-input);border:1px solid var(--color-border);border-radius:var(--radius-md);width:100%;color:var(--color-text);font-family:var(--font-sans);transition:all var(--transition-fast);outline:none;padding:10px 14px;font-size:14px}.input::placeholder{color:var(--color-text-tertiary)}.input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #4f6bf626}.stats-grid{gap:var(--spacing-md);margin-bottom:var(--spacing-xl);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));display:grid}.stat-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--spacing-lg)}.stat-label{color:var(--color-text-secondary);margin-bottom:var(--spacing-xs);font-size:13px;font-weight:500}.stat-value{color:var(--color-text);letter-spacing:-.02em;font-size:32px;font-weight:800}.stat-icon{border-radius:var(--radius-md);width:40px;height:40px;margin-bottom:var(--spacing-sm);justify-content:center;align-items:center;display:flex}.stat-icon.blue{color:var(--color-primary);background:#4f6bf626}.stat-icon.green{color:var(--color-accent);background:#10b98126}.stat-icon.amber{color:var(--color-warning);background:#f59e0b26}.stat-icon.purple{color:#8b5cf6;background:#8b5cf626}.notebook-grid{gap:var(--spacing-md);grid-template-columns:repeat(auto-fill,minmax(320px,1fr));display:grid}.spinner{border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;width:24px;height:24px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-state{justify-content:center;align-items:center;gap:var(--spacing-md);padding:var(--spacing-2xl);color:var(--color-text-secondary);flex-direction:column;display:flex}.empty-state{text-align:center;padding:var(--spacing-2xl);color:var(--color-text-secondary)}.empty-state svg{width:48px;height:48px;color:var(--color-text-tertiary);margin-bottom:var(--spacing-md)}.empty-state h3{color:var(--color-text);margin-bottom:var(--spacing-xs)}.login-page{background:var(--color-bg);justify-content:center;align-items:center;min-height:100vh;display:flex;position:relative;overflow:hidden}.login-page:before{content:"";background:radial-gradient(circle at 30% 30%,#4f6bf614 0%,#0000 50%),radial-gradient(circle at 70% 70%,#8b5cf60f 0%,#0000 50%);width:200%;height:200%;animation:20s ease-in-out infinite loginBgFloat;position:absolute;top:-50%;left:-50%}@keyframes loginBgFloat{0%,to{transform:translate(0)}50%{transform:translate(-2%,-2%)}}.login-card{z-index:1;background:var(--color-bg-elevated);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--spacing-2xl);text-align:center;width:100%;max-width:420px;box-shadow:var(--shadow-lg);position:relative}.login-logo{background:linear-gradient(135deg, var(--color-primary), #8b5cf6);border-radius:var(--radius-lg);color:#fff;width:56px;height:56px;margin:0 auto var(--spacing-lg);box-shadow:var(--shadow-glow);justify-content:center;align-items:center;font-size:22px;font-weight:800;display:flex}.login-title{color:var(--color-text);margin-bottom:var(--spacing-xs);letter-spacing:-.02em;font-size:24px;font-weight:800}.login-subtitle{color:var(--color-text-secondary);margin-bottom:var(--spacing-xl);font-size:15px;line-height:1.5}.login-divider{align-items:center;gap:var(--spacing-md);margin:var(--spacing-lg) 0;color:var(--color-text-tertiary);font-size:12px;display:flex}.login-divider:before,.login-divider:after{content:"";background:var(--color-border);flex:1;height:1px}.login-footer{margin-top:var(--spacing-xl);color:var(--color-text-tertiary);font-size:12px}.login-error{border-radius:var(--radius-md);padding:var(--spacing-sm) var(--spacing-md);color:var(--color-danger);margin-bottom:var(--spacing-md);background:#ef44441a;border:1px solid #ef444433;font-size:13px}@media (width<=768px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-content{margin-left:0}.page-container{padding:var(--spacing-md)}.notebook-grid{grid-template-columns:1fr}}