:root{--bg-base: #0d1117;--bg-surface: #161b22;--bg-raised: #1c2128;--bg-hover: #21262d;--border: #30363d;--border-subtle: #21262d;--text-primary: #e6edf3;--text-secondary: #7d8590;--text-muted: #484f58;--accent: #58a6ff;--accent-hover: #79c0ff;--accent-bg: rgba(88, 166, 255, .08);--red: #f85149;--green: #3fb950;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;--sidebar-width: 270px;--header-height: 56px;--feed-max: 680px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:15px;scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg-base);color:var(--text-primary);line-height:1.5;min-height:100vh;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}ul,li{list-style:none}.app{display:flex;flex-direction:column;min-height:100vh}.header{position:sticky;top:0;z-index:100;height:var(--header-height);background:#0d1117d9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.header-inner{max-width:calc(var(--sidebar-width) + var(--feed-max) + 64px);margin:0 auto;padding:0 16px;height:100%;display:flex;align-items:center;gap:16px}.header-logo{display:flex;align-items:center;gap:10px}.header-icon{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;background:var(--accent);color:#fff;font-weight:700;font-size:11px;border-radius:8px;letter-spacing:.5px}.header-title{font-size:1.1rem;font-weight:700;color:var(--text-primary)}.header-sub{font-size:.8rem;color:var(--text-secondary);margin-left:auto}.layout{display:flex;max-width:calc(var(--sidebar-width) + var(--feed-max) + 64px);margin:0 auto;width:100%;padding:0 16px;gap:24px;flex:1}.sidebar-wrapper{width:var(--sidebar-width);flex-shrink:0}.feed-wrapper{flex:1;min-width:0;max-width:var(--feed-max)}.sidebar{position:sticky;top:calc(var(--header-height) + 16px);max-height:calc(100vh - var(--header-height) - 32px);overflow-y:auto;padding:16px 0;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:0 4px 12px;margin-bottom:4px;border-bottom:1px solid var(--border-subtle)}.sidebar-title{font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.8px;color:var(--text-secondary)}.clear-btn{font-size:.75rem;color:var(--accent);padding:2px 8px;border-radius:20px;border:1px solid var(--accent);transition:background .15s}.clear-btn:hover{background:var(--accent-bg)}.sidebar-section{margin-bottom:4px}.sidebar-section-header{display:flex;align-items:center;justify-content:space-between;width:100%;padding:8px 4px;font-size:.8rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.6px;border-radius:var(--radius-sm);transition:color .15s}.sidebar-section-header:hover{color:var(--text-primary)}.sidebar-chevron{font-size:.7rem;color:var(--text-muted)}.sidebar-tag-list{padding:2px 0 8px}.sidebar-tag{display:flex;align-items:center;justify-content:space-between;width:100%;padding:5px 8px 5px 4px;border-radius:var(--radius-sm);font-size:.82rem;color:var(--text-secondary);transition:all .15s}.sidebar-tag:hover{color:var(--text-primary);background:var(--bg-hover)}.sidebar-tag.active{color:var(--accent);background:var(--accent-bg);font-weight:500}.sidebar-tag-name{flex:1;text-align:left}.sidebar-tag-count{font-size:.72rem;color:var(--text-muted);background:var(--bg-raised);padding:1px 6px;border-radius:10px;min-width:24px;text-align:center}.sidebar-tag.active .sidebar-tag-count{background:var(--accent-bg);color:var(--accent)}.learn-section{padding:16px 0 4px;border-bottom:1px solid var(--border);margin-bottom:4px}.learn-header{display:flex;align-items:baseline;gap:10px;margin-bottom:12px;padding:0 2px}.learn-title{font-size:.85rem;font-weight:700;color:var(--text-primary);text-transform:uppercase;letter-spacing:.6px}.learn-sub{font-size:.75rem;color:var(--text-muted)}.learn-scroll{display:flex;gap:10px;overflow-x:auto;padding-bottom:12px;scrollbar-width:thin;scrollbar-color:var(--border) transparent;-webkit-overflow-scrolling:touch}.learn-scroll::-webkit-scrollbar{height:4px}.learn-scroll::-webkit-scrollbar-track{background:transparent}.learn-scroll::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.learn-card{flex-shrink:0;width:200px;background:var(--bg-surface);border:1px solid var(--border);border-top:3px solid var(--tool-color, var(--accent));border-radius:var(--radius-md);padding:12px;display:flex;flex-direction:column;gap:6px;text-decoration:none;transition:background .15s,border-color .15s,transform .1s;cursor:pointer}.learn-card:hover{background:var(--bg-hover);transform:translateY(-2px);border-color:var(--tool-color, 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.15s}.filters-toggle:hover{background:var(--bg-hover)}.filters-toggle-label{display:flex;align-items:center;gap:8px}.filters-toggle-badge{display:inline-flex;align-items:center;justify-content:center;min-width:20px;height:20px;padding:0 6px;background:var(--accent);color:#fff;border-radius:10px;font-size:.72rem;font-weight:700}.filters-toggle-chevron{font-size:.65rem;color:var(--text-muted)}.sidebar-collapsible{display:none;border:1px solid var(--border);border-top:none;border-radius:0 0 var(--radius-md) var(--radius-md);background:var(--bg-surface);overflow:hidden}.sidebar-collapsible.open{display:block}.sidebar-collapsible .sidebar{position:static;max-height:60vh;overflow-y:auto;border:none;border-radius:0;padding:12px;margin:0}.feed-toolbar{flex-wrap:wrap;position:static}.sort-tabs{width:100%;justify-content:center}.sort-tab{flex:1;text-align:center}}@media (min-width: 701px){.sidebar-collapsible{display:block!important}}@media (max-width: 480px){.card:hover{margin:0;padding:16px 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