:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;--bg-color: #ffffff;--text-color: #213547;--sidebar-bg: #f8f9fa;--border-color: #e9ecef;--accent-color: #007bff;--hover-color: #e2e6ea;--sidebar-width: 250px;--item-list-width: 350px}@media(prefers-color-scheme:dark){:root{--bg-color: #1a1a1a;--text-color: #e9ecef;--sidebar-bg: #212529;--border-color: #343a40;--accent-color: #375a7f;--hover-color: #2c3034}}body{margin:0;color:var(--text-color);background-color:var(--bg-color);height:100vh;overflow:hidden}#app{height:100%}.layout{display:flex;height:100%}.sidebar{width:var(--sidebar-width);background-color:var(--sidebar-bg);border-right:1px solid var(--border-color);display:flex;flex-direction:column}.sidebar-header{padding:1rem;border-bottom:1px solid var(--border-color)}.sidebar-header h2{margin:0;font-size:1.1rem}.sidebar-scroll{flex:1;overflow-y:auto;padding:.5rem 0}.sidebar-section{margin-bottom:1.5rem}.sidebar-section h3{padding:0 1rem;font-size:.75rem;text-transform:uppercase;color:#888;margin:0 0 .5rem;letter-spacing:.05rem}.sidebar-section ul{list-style:none;padding:0;margin:0}.sidebar-section li a{display:block;padding:.4rem 1rem;text-decoration:none;color:var(--text-color);font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-section li:hover{background-color:var(--hover-color)}.sidebar-section li.active{background-color:var(--hover-color);font-weight:700}.sidebar-section li.active a{color:var(--accent-color)}.item-list-pane{width:var(--item-list-width);border-right:1px solid var(--border-color);display:flex;flex-direction:column;background-color:var(--bg-color)}.top-bar{padding:.75rem 1rem;border-bottom:1px solid var(--border-color);background-color:var(--bg-color);z-index:10}.top-bar h1{margin:0;font-size:1rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.item-list-container{flex:1;overflow-y:auto}.item-list{list-style:none;padding:0;margin:0}.item-row{padding:.75rem 1rem;border-bottom:1px solid var(--border-color);cursor:pointer;transition:background .1s}.item-row:hover{background-color:var(--hover-color)}.item-row.active{background-color:var(--hover-color);border-left:3px solid var(--accent-color)}.item-row.read{opacity:.6}.item-title{font-weight:600;font-size:.9rem;margin-bottom:.2rem;line-height:1.3}.item-meta{font-size:.75rem;color:#888}.load-more{padding:1.5rem;text-align:center;color:#888;font-size:.85rem}.item-detail-pane{flex:1;overflow-y:auto;background-color:var(--bg-color)}.item-detail-content{max-width:700px;margin:0 auto;padding:2rem}.item-detail header{margin-bottom:2rem;border-bottom:1px solid var(--border-color);padding-bottom:1.5rem}.item-detail h1{font-size:1.75rem;margin:0 0 .75rem;line-height:1.2}.item-detail h1 a{color:var(--text-color);text-decoration:none}.item-detail h1 a:hover{text-decoration:underline}.full-content{font-size:1.1rem;line-height:1.7}.full-content img{max-width:100%;height:auto;display:block;margin:1.5rem 0;border-radius:4px}.full-content a{color:var(--accent-color)}.empty-state{display:flex;align-items:center;justify-content:center;height:100%;color:#888;font-size:1.1rem}.loading,.empty{padding:2rem;text-align:center;color:#888}