:root{--sidebar-width: 280px;--primary: #2563eb;--primary-light: #3b82f6;--primary-dark: #1d4ed8;--bg: #ffffff;--bg-sidebar: #f8fafc;--bg-code: #1e293b;--bg-tip: #eff6ff;--bg-warning: #fef3c7;--bg-card: #f1f5f9;--text: #1e293b;--text-light: #64748b;--text-sidebar: #475569;--text-code: #e2e8f0;--border: #e2e8f0;--border-light: #f1f5f9;--shadow: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 6px rgba(0, 0, 0, .07);--radius: 8px;--font-sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "Fira Code", "Cascadia Code", "JetBrains Mono", Consolas, monospace}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-sans);background-color:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}img{max-width:100%;display:block}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark);text-decoration:underline}.app-layout{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border);height:100vh;position:fixed;top:0;left:0;overflow-y:auto;z-index:100;transition:transform .3s ease;display:flex;flex-direction:column}.sidebar-header{padding:1.25rem 1.5rem;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:.5rem}.sidebar-header h2{font-size:1.1rem;font-weight:700;color:var(--text);white-space:nowrap}.sidebar-header .logo-icon{font-size:1.4rem;color:var(--primary)}.sidebar-search{padding:.75rem 1rem;border-bottom:1px solid var(--border)}.sidebar-search input{width:100%;padding:.5rem .75rem;border:1px solid var(--border);border-radius:6px;font-size:.85rem;font-family:var(--font-sans);background:var(--bg);color:var(--text);outline:none;transition:border-color .2s}.sidebar-search input:focus{border-color:var(--primary-light);box-shadow:0 0 0 3px #2563eb1a}.sidebar-search input::placeholder{color:var(--text-light)}.sidebar-nav{flex:1;overflow-y:auto;padding:.5rem 0}.sidebar-category{margin-bottom:.25rem}.sidebar-category-btn{display:flex;align-items:center;justify-content:space-between;width:100%;padding:.6rem 1.25rem;background:none;border:none;cursor:pointer;font-size:.8rem;font-weight:600;font-family:var(--font-sans);color:var(--text-light);text-transform:uppercase;letter-spacing:.05em;transition:color .2s}.sidebar-category-btn:hover{color:var(--text)}.sidebar-category-btn .chevron{font-size:.7rem;transition:transform .2s}.sidebar-category-btn.open .chevron{transform:rotate(90deg)}.sidebar-links{list-style:none;overflow:hidden;transition:max-height .3s ease}.sidebar-links.collapsed{max-height:0!important}.sidebar-links li a{display:block;padding:.4rem 1.25rem .4rem 2rem;font-size:.88rem;color:var(--text-sidebar);text-decoration:none;border-left:3px solid transparent;transition:all .15s}.sidebar-links li a:hover{background:#2563eb0d;color:var(--primary);text-decoration:none}.sidebar-links li a.active{color:var(--primary);background:#2563eb14;border-left-color:var(--primary);font-weight:500}.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh}.content-area{max-width:820px;margin:0 auto;padding:2.5rem 2rem 4rem}.mobile-menu-btn{display:none;position:fixed;top:1rem;left:1rem;z-index:200;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.5rem .65rem;cursor:pointer;box-shadow:var(--shadow);font-size:1.3rem;color:var(--text);line-height:1}.sidebar-overlay{display:none;position:fixed;inset:0;background:#0000004d;z-index:90}.topic-page h1{font-size:2rem;font-weight:800;color:var(--text);margin-bottom:.5rem;line-height:1.3}.topic-page .topic-subtitle{font-size:1.05rem;color:var(--text-light);margin-bottom:2rem;line-height:1.6}.topic-page h2{font-size:1.4rem;font-weight:700;color:var(--text);margin-top:2.5rem;margin-bottom:.75rem;padding-bottom:.4rem;border-bottom:2px solid var(--border-light)}.topic-page h3{font-size:1.15rem;font-weight:600;color:var(--text);margin-top:1.75rem;margin-bottom:.5rem}.topic-page p{margin-bottom:1rem;color:var(--text);line-height:1.8}.topic-page ul,.topic-page ol{margin-bottom:1rem;padding-left:1.5rem}.topic-page li{margin-bottom:.4rem;line-height:1.7}.topic-page code{background:var(--bg-card);padding:.15rem .4rem;border-radius:4px;font-family:var(--font-mono);font-size:.88em;color:var(--primary-dark)}.code-block-wrapper{margin:1.25rem 0 1.5rem;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.code-block-header{display:flex;align-items:center;justify-content:space-between;background:#0f172a;padding:.5rem 1rem;border-bottom:1px solid #334155}.code-block-lang{font-size:.75rem;font-weight:600;color:#94a3b8;text-transform:uppercase;letter-spacing:.05em}.code-block-copy{background:none;border:1px solid #334155;color:#94a3b8;padding:.25rem .6rem;border-radius:4px;font-size:.75rem;cursor:pointer;font-family:var(--font-sans);transition:all .2s}.code-block-copy:hover{border-color:#64748b;color:#e2e8f0}.code-block-wrapper pre{margin:0!important;padding:1rem 1.25rem!important;background:var(--bg-code)!important;border-radius:0!important;font-size:.88rem!important;line-height:1.65!important}.code-block-wrapper code{background:none!important;padding:0!important;color:inherit!important;font-size:inherit!important}.tip-box{padding:1rem 1.25rem;border-radius:var(--radius);margin:1.25rem 0;border-left:4px solid}.tip-box p{margin-bottom:.25rem}.tip-box p:last-child{margin-bottom:0}.tip-box.info{background:var(--bg-tip);border-color:var(--primary)}.tip-box.warning{background:var(--bg-warning);border-color:#f59e0b}.tip-box.success{background:#ecfdf5;border-color:#10b981}.tip-box .tip-title{font-weight:700;font-size:.9rem;margin-bottom:.3rem}.quick-ref{background:var(--bg-card);border-radius:var(--radius);padding:1.25rem 1.5rem;margin-top:2rem}.quick-ref h3{margin-top:0;font-size:1rem;color:var(--primary-dark)}.quick-ref ul{margin-bottom:0}.quick-ref code{background:#e2e8f0}.home-page h1{font-size:2.2rem;font-weight:800;margin-bottom:.5rem}.home-page .home-subtitle{font-size:1.1rem;color:var(--text-light);margin-bottom:2.5rem}.home-categories{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem;margin-bottom:2rem}.home-card{background:var(--bg-card);border-radius:var(--radius);padding:1.25rem;transition:all .2s;text-decoration:none;color:var(--text);border:1px solid transparent}.home-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-md);text-decoration:none;transform:translateY(-2px)}.home-card h3{font-size:1rem;font-weight:700;margin-bottom:.4rem;color:var(--text)}.home-card p{font-size:.85rem;color:var(--text-light);margin:0;line-height:1.5}.home-card .card-count{font-size:.75rem;color:var(--primary);font-weight:600;margin-top:.5rem}@media(max-width:768px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay.show,.mobile-menu-btn{display:block}.main-content{margin-left:0}.content-area{padding:3.5rem 1.25rem 3rem}.topic-page h1{font-size:1.6rem}.home-page h1{font-size:1.8rem}}@media(max-width:480px){.content-area{padding:3.5rem 1rem 2rem}.home-categories{grid-template-columns:1fr}}