:root{--c-brand: #3eaf7c;--c-brand-light: #4abf8a;--c-bg: #fff;--c-bg-sidebar: #f8f8f8;--c-text: #2c3e50;--c-text-light: #666;--c-border: #eaecef;--sidebar-width: 260px;--header-height: 56px}html.dark{--c-brand: #3eaf7c;--c-brand-light: #4abf8a;--c-bg: #1a1a2e;--c-bg-sidebar: #16213e;--c-text: #e0e0e0;--c-text-light: #aaa;--c-border: #2d3748}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans SC,PingFang SC,Microsoft YaHei,sans-serif;color:var(--c-text);background:var(--c-bg);line-height:1.7}a{color:var(--c-brand);text-decoration:none}a:hover{color:var(--c-brand-light)}.header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:var(--c-bg);border-bottom:1px solid var(--c-border);display:flex;align-items:center;padding:0 24px;z-index:100}.header-logo{font-size:1.2rem;font-weight:700;color:var(--c-text)}.header-logo:hover{color:var(--c-brand)}.header-nav{display:flex;gap:4px;margin-left:32px;list-style:none}.header-nav a{padding:6px 12px;border-radius:6px;font-size:.9rem;color:var(--c-text-light);transition:all .2s}.header-nav a:hover,.header-nav a.active{color:var(--c-brand);background:#3eaf7c14}.theme-toggle{margin-left:auto;background:none;border:none;font-size:1.2rem;cursor:pointer;padding:4px 8px;border-radius:6px;color:var(--c-text-light)}.theme-toggle:hover{background:#3eaf7c14}.layout{display:flex;padding-top:var(--header-height);min-height:100vh}.sidebar{width:var(--sidebar-width);position:fixed;top:var(--header-height);left:0;bottom:0;overflow-y:auto;padding:16px 0;background:var(--c-bg-sidebar);border-right:1px solid var(--c-border)}.sidebar-section{margin-bottom:8px}.sidebar-section-title{padding:8px 20px;font-size:.85rem;font-weight:600;color:var(--c-text-light);text-transform:uppercase;letter-spacing:.5px;cursor:pointer;display:flex;align-items:center;gap:6px}.sidebar-section-title .arrow{transition:transform .2s;font-size:.7rem}.sidebar-section-title.collapsed .arrow{transform:rotate(-90deg)}.sidebar-links{list-style:none;padding:0}.sidebar-links.hidden{display:none}.sidebar-links a{display:block;padding:6px 20px 6px 28px;font-size:.88rem;color:var(--c-text-light);border-left:3px solid transparent;transition:all .15s}.sidebar-links a:hover{color:var(--c-brand);background:#3eaf7c0d}.sidebar-links a.active{color:var(--c-brand);border-left-color:var(--c-brand);background:#3eaf7c14}.main-content{flex:1;margin-left:var(--sidebar-width);padding:32px 40px 80px;max-width:900px}.article-content h1{font-size:1.8rem;margin-bottom:8px;padding-bottom:12px;border-bottom:1px solid var(--c-border)}.article-content h2{font-size:1.4rem;margin-top:2.5em;margin-bottom:.8em;padding-bottom:6px;border-bottom:1px solid var(--c-border)}.article-content h3{font-size:1.15rem;margin-top:2em;margin-bottom:.6em}.article-content p{margin:.8em 0}.article-content ul,.article-content ol{padding-left:1.5em;margin:.6em 0}.article-content code{background:#3eaf7c14;padding:2px 6px;border-radius:4px;font-size:.88em}.article-content pre{margin:1em 0;border-radius:8px;overflow-x:auto}.article-content pre code{background:none;padding:0}.article-content blockquote{border-left:4px solid var(--c-brand);padding:8px 16px;margin:1em 0;background:#3eaf7c0a;border-radius:0 4px 4px 0}.article-content table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.9em}.article-content th,.article-content td{border:1px solid var(--c-border);padding:8px 12px;text-align:left}.article-content th{background:var(--c-bg-sidebar);font-weight:600}.article-content img{max-width:100%;border-radius:8px}.article-content hr{border:none;border-top:1px solid var(--c-border);margin:2em 0}.home-hero{text-align:center;padding:80px 24px 40px}.home-hero h1{font-size:2.5rem;margin-bottom:12px}.home-hero p{color:var(--c-text-light);font-size:1.1rem;margin-bottom:24px}.home-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;max-width:800px;margin:0 auto;padding:0 24px 60px}.feature-card{border:1px solid var(--c-border);border-radius:12px;padding:24px;transition:all .2s}.feature-card:hover{border-color:var(--c-brand);box-shadow:0 4px 12px #3eaf7c1a}.feature-card .icon{font-size:2rem;margin-bottom:8px}.feature-card h3{font-size:1.1rem;margin-bottom:6px}.feature-card p{color:var(--c-text-light);font-size:.88rem}.stack-header{margin-bottom:24px}.stack-header h1{font-size:2rem;margin-bottom:6px}.stack-header p{color:var(--c-text-light)}.category-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}@media(max-width:1100px){.category-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:900px){.category-grid{grid-template-columns:repeat(2,1fr)}}.category-card{border:1px solid var(--c-border);border-radius:12px;padding:28px}.category-card h3{font-size:1.15rem;margin-bottom:14px;color:var(--c-brand)}.category-card ul{list-style:none;padding:0}.category-card li{padding:7px 0}.category-card a{font-size:1rem;color:var(--c-text)}.category-card a:hover{color:var(--c-brand)}@media(max-width:768px){.sidebar{display:none}.main-content{margin-left:0;padding:24px 16px 60px}.header-nav{display:none}.category-grid{grid-template-columns:1fr}}