:root{--bg-primary: #ffffff;--bg-secondary: #f5f5f5;--bg-tertiary: #e5e5e5;--text-primary: #1a1a1a;--text-secondary: #666666;--border-color: #e0e0e0;--accent-color: #3b82f6;--accent-hover: #2563eb;--success-color: #10b981;--danger-color: #ef4444;--shadow: 0 1px 3px rgba(0, 0, 0, .1);--shadow-lg: 0 4px 6px rgba(0, 0, 0, .1)}.dark-theme{--bg-primary: #1a1a1a;--bg-secondary: #2a2a2a;--bg-tertiary: #3a3a3a;--text-primary: #ffffff;--text-secondary: #a0a0a0;--border-color: #404040;--shadow: 0 1px 3px rgba(0, 0, 0, .3);--shadow-lg: 0 4px 6px rgba(0, 0, 0, .3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--bg-secondary);color:var(--text-primary);transition:background .3s,color .3s}.app{height:100vh;display:flex;flex-direction:column}.header{background:var(--bg-primary);border-bottom:1px solid var(--border-color);padding:1rem 2rem;box-shadow:var(--shadow)}.header-content{max-width:1400px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.header h1{font-size:1.5rem;font-weight:600}.header-actions{display:flex;gap:.5rem}.main-content{flex:1;display:grid;grid-template-columns:250px 350px 1fr;gap:0;overflow:hidden}.sidebar{background:var(--bg-primary);border-right:1px solid var(--border-color);padding:1.5rem;overflow-y:auto}.search-box{margin-bottom:1.5rem}.search-input{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:8px;background:var(--bg-secondary);color:var(--text-primary);font-size:.875rem}.search-input:focus{outline:none;border-color:var(--accent-color)}.nav{display:flex;flex-direction:column;gap:.5rem;margin-bottom:2rem}.nav-item{padding:.75rem 1rem;border:none;background:transparent;color:var(--text-secondary);text-align:left;border-radius:8px;cursor:pointer;font-size:.875rem;transition:all .2s}.nav-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.nav-item.active{background:var(--accent-color);color:#fff}.stats{padding:1rem;background:var(--bg-secondary);border-radius:8px;display:flex;flex-direction:column;gap:.75rem}.stat-item{display:flex;justify-content:space-between;align-items:center}.stat-label{font-size:.875rem;color:var(--text-secondary)}.stat-value{font-weight:600;color:var(--accent-color)}.notes-list-container{background:var(--bg-secondary);border-right:1px solid var(--border-color);overflow-y:auto;padding:1.5rem}.notes-list{display:flex;flex-direction:column;gap:1rem}.note-card{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;padding:1rem;cursor:pointer;transition:all .2s}.note-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.note-card.pinned{border-left:3px solid var(--accent-color)}.note-card-header{display:flex;justify-content:space-between;align-items:start;margin-bottom:.5rem}.note-card-title{font-size:1rem;font-weight:600;color:var(--text-primary)}.pin-badge{font-size:.875rem}.note-card-content{font-size:.875rem;color:var(--text-secondary);line-height:1.5;margin-bottom:.75rem}.note-card-footer{display:flex;justify-content:space-between;align-items:center;gap:.5rem}.note-tags{display:flex;gap:.5rem;flex-wrap:wrap}.tag{padding:.25rem .5rem;background:var(--bg-secondary);border-radius:4px;font-size:.75rem;color:var(--text-secondary)}.note-date{font-size:.75rem;color:var(--text-secondary);white-space:nowrap}.note-editor{background:var(--bg-primary);display:flex;flex-direction:column;overflow:hidden}.editor-header{padding:1rem 1.5rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.editor-actions{display:flex;gap:.5rem}.note-title-input{padding:1.5rem;border:none;border-bottom:1px solid var(--border-color);background:transparent;color:var(--text-primary);font-size:1.5rem;font-weight:600}.note-title-input:focus{outline:none}.note-content-input{flex:1;padding:1.5rem;border:none;background:transparent;color:var(--text-primary);font-size:1rem;line-height:1.6;resize:none;font-family:inherit}.note-content-input:focus{outline:none}.editor-footer{padding:1rem 1.5rem;border-top:1px solid var(--border-color);display:flex;gap:1rem;align-items:center}.tags-input{flex:1;padding:.5rem;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-secondary);color:var(--text-primary);font-size:.875rem}.tags-input:focus{outline:none;border-color:var(--accent-color)}.btn{padding:.5rem 1rem;border:none;border-radius:6px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .2s}.btn-primary{background:var(--accent-color);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-icon{padding:.5rem;background:transparent;color:var(--text-secondary);font-size:1.25rem}.btn-icon:hover{background:var(--bg-secondary);color:var(--text-primary)}.empty-state{text-align:center;padding:3rem 1rem;color:var(--text-secondary)}.empty-icon{font-size:4rem;margin-bottom:1rem}.empty-state p{margin-bottom:1.5rem}.loading,.error{text-align:center;padding:2rem;color:var(--text-secondary)}.error{color:var(--danger-color)}@media (max-width: 1024px){.main-content{grid-template-columns:200px 1fr}.note-editor{position:fixed;top:0;left:0;right:0;bottom:0;z-index:100}}@media (max-width: 768px){.main-content{grid-template-columns:1fr}.sidebar{display:none}.notes-list-container{border-right:none}}