:root{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-card: #ffffff;--bg-hover: rgba(0, 0, 0, .03);--bg-count: rgba(0, 0, 0, .05);--bg-code: rgba(0, 0, 0, .06);--bg-header-rgba: rgba(248, 250, 252, .85);--accent-color: #3b82f6;--accent-hover: #2563eb;--text-primary: #0f172a;--text-secondary: #475569;--border-color: #e2e8f0;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--font-family: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}html.dark{--bg-primary: #0a0e17;--bg-secondary: #111827;--bg-card: #1f2937;--bg-hover: rgba(255, 255, 255, .03);--bg-count: rgba(255, 255, 255, .05);--bg-code: rgba(255, 255, 255, .06);--bg-header-rgba: rgba(10, 14, 23, .8);--accent-color: #3b82f6;--accent-hover: #2563eb;--text-primary: #f9fafb;--text-secondary: #9ca3af;--border-color: #2c3545}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-primary);font-family:var(--font-family);-webkit-font-smoothing:antialiased;overflow-x:hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--accent-color)}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1.25rem 2rem;background-color:var(--bg-header-rgba);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:100}.brand{display:flex;align-items:center;gap:.75rem}.brand-title{font-size:1.35rem;font-weight:800;letter-spacing:-.02em;background:linear-gradient(135deg,var(--text-primary) 0%,var(--accent-color) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.brand-badge{background-color:#3b82f626;color:var(--accent-color);font-size:.7rem;font-weight:700;padding:.25rem .5rem;border-radius:9999px;border:1px solid rgba(59,130,246,.3)}.main-layout{display:grid;grid-template-columns:320px 1fr;flex:1;max-width:1440px;width:100%;margin:0 auto;min-height:calc(100vh - 75px)}.sidebar{border-right:1px solid var(--border-color);background-color:var(--bg-secondary);padding:1.5rem;display:flex;flex-direction:column;gap:1.5rem;overflow-y:auto;position:sticky;top:75px;height:calc(100vh - 75px)}.search-container{position:relative}.search-input{width:100%;padding:.75rem 1rem .75rem 2.5rem;background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font-family);font-size:.9rem;transition:all .2s ease}.search-input:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px #3b82f626}.search-icon{position:absolute;left:.85rem;top:50%;transform:translateY(-50%);color:var(--text-secondary);pointer-events:none}.category-title{font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);margin-bottom:.75rem}.category-list{display:flex;flex-direction:column;gap:.35rem}.category-btn{display:flex;align-items:center;justify-content:space-between;width:100%;padding:.65rem .85rem;background:none;border:none;color:var(--text-secondary);font-family:var(--font-family);font-size:.88rem;font-weight:500;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s ease}.category-btn:hover{background-color:var(--bg-hover);color:var(--text-primary)}.category-btn.active{background-color:#3b82f61a;color:var(--accent-color);font-weight:600}.category-count{font-size:.75rem;background-color:var(--bg-count);padding:.1rem .4rem;border-radius:4px}.category-btn.active .category-count{background-color:#3b82f633}.articles-list-container{display:flex;flex-direction:column;gap:.5rem}.article-link{display:flex;flex-direction:column;padding:.75rem 1rem;border-radius:var(--radius-md);background-color:var(--bg-primary);border:1px solid var(--border-color);cursor:pointer;transition:all .2s ease;text-align:left;width:100%}.article-link:hover{border-color:var(--accent-color);transform:translateY(-1px)}.article-link.active{border-color:var(--accent-color);background-color:#3b82f60d;box-shadow:0 4px 12px #3b82f60d}.article-link-title{font-size:.92rem;font-weight:600;color:var(--text-primary);margin-bottom:.25rem}.article-link-meta{font-size:.75rem;color:var(--text-secondary)}.content-area{padding:2.5rem;overflow-y:auto;height:calc(100vh - 75px);background-color:var(--bg-primary)}.welcome-box{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;color:var(--text-secondary);gap:1rem;max-width:600px;margin:0 auto}.welcome-title{font-size:2rem;font-weight:800;color:var(--text-primary)}.article-reader{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:1.5rem}.article-header{border-bottom:1px solid var(--border-color);padding-bottom:1.5rem}.article-category-badge{display:inline-block;font-size:.75rem;font-weight:700;text-transform:uppercase;color:var(--accent-color);margin-bottom:.5rem}.article-title{font-size:2.25rem;font-weight:800;letter-spacing:-.03rem;margin-bottom:.75rem;line-height:1.25}.article-meta{display:flex;gap:1.5rem;font-size:.8rem;color:var(--text-secondary)}.markdown-body{font-size:1.05rem;line-height:1.7;color:var(--text-primary)}.markdown-body p{margin-bottom:1.25rem}.markdown-body h2{font-size:1.5rem;font-weight:700;margin:2rem 0 1rem;border-bottom:1px solid var(--border-color);padding-bottom:.4rem}.markdown-body h3{font-size:1.2rem;font-weight:600;margin:1.5rem 0 .75rem}.markdown-body ul,.markdown-body ol{margin-bottom:1.25rem;padding-left:1.5rem}.markdown-body li{margin-bottom:.4rem}.markdown-body blockquote{border-left:4px solid var(--accent-color);background-color:#3b82f60d;padding:.75rem 1.25rem;margin:1.5rem 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-style:italic;color:var(--text-primary)}.markdown-body pre{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1rem;overflow-x:auto;margin:1.5rem 0;font-family:monospace}.markdown-body code{background-color:var(--bg-code);padding:.15rem .35rem;border-radius:4px;font-family:monospace;font-size:.9rem}.markdown-body pre code{background-color:transparent;padding:0;border-radius:0}.spin{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}