:root{--primary:#b91c1c;--primary-light:#fef2f2;--text:#1a1a2e;--text-light:#6b7280;--bg:#fff;--bg-alt:#f9fafb;--border:#e5e7eb;--max-width:1200px}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none;transition:opacity .2s}a:hover{opacity:.8}.container{max-width:var(--max-width);margin:0 auto;padding:0 1.5rem}h1,h2,h3,h4{line-height:1.3;color:var(--text)}h1{font-size:2.5rem;margin-bottom:1rem}h2{font-size:1.8rem;margin:2rem 0 1rem}h3{font-size:1.3rem;margin:1.5rem 0 .75rem}p{margin-bottom:1rem}img{max-width:100%;height:auto}.header{background:var(--text);color:#fff;padding:1rem 0;position:-webkit-sticky;position:sticky;top:0;z-index:100}.header .container{display:flex;align-items:center;justify-content:space-between}.header .logo{font-size:1.4rem;font-weight:700;color:#fff}.header nav a{color:hsla(0,0%,100%,.85);margin-left:1.5rem;font-size:.95rem}.header nav a:hover{color:#fff;opacity:1}.hero{background:linear-gradient(135deg,var(--text) 0,#16213e 100%);color:#fff;padding:5rem 0;text-align:center}.hero h1{font-size:3rem;margin-bottom:1.5rem}.hero p{font-size:1.2rem;opacity:.9;max-width:700px;margin:0 auto 2rem}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));grid-gap:1.5rem;gap:1.5rem;padding:2rem 0}.card{border:1px solid var(--border);border-radius:12px;padding:1.5rem;transition:box-shadow .2s,transform .2s;background:var(--bg)}.card:hover{box-shadow:0 4px 20px rgba(0,0,0,.08);transform:translateY(-2px)}.card h3{margin-top:0}.card p{color:var(--text-light);font-size:.95rem}.article{max-width:800px;margin:0 auto;padding:3rem 1.5rem}.article h1{font-size:2.2rem}.article .meta{color:var(--text-light);margin-bottom:2rem;font-size:.9rem}.footer{background:var(--text);color:hsla(0,0%,100%,.7);padding:3rem 0;margin-top:4rem;text-align:center;font-size:.9rem}.footer a{color:hsla(0,0%,100%,.85)}.section{padding:4rem 0}.section:nth-child(2n){background:var(--bg-alt)}.section-title{text-align:center;margin-bottom:2rem}.breadcrumb{padding:1rem 0;font-size:.85rem}.breadcrumb,.breadcrumb a{color:var(--text-light)}.toc{background:var(--bg-alt);border-radius:8px;padding:1.5rem;margin-bottom:2rem}.toc h4{margin-bottom:.75rem}.toc ul{list-style:none;padding-left:0}.toc li{margin-bottom:.4rem}.toc a{color:var(--text-light);font-size:.9rem}@media (max-width:768px){.hero h1{font-size:2rem}h1{font-size:1.8rem}.card-grid{grid-template-columns:1fr}.header nav{display:none}}.article{padding:2rem 0 4rem}.article-header{margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid #e5e7eb}.article-header h1{font-size:2.2rem;line-height:1.3;margin:.5rem 0}.breadcrumb{font-size:.9rem;color:#6b7280;margin-bottom:.5rem}.breadcrumb a{color:var(--primary-color,#991b1b);text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.meta{color:#6b7280;font-size:.9rem}.article-body{line-height:1.8;font-size:1.1rem}.article-body h2{margin-top:2rem;font-size:1.6rem}.article-body h3{margin-top:1.5rem;font-size:1.3rem}.article-body p{margin:1rem 0}.article-body ol,.article-body ul{margin:1rem 0;padding-left:2rem}.article-body li{margin:.5rem 0}.article-body blockquote{border-left:4px solid var(--primary-color,#991b1b);padding:.5rem 1rem;margin:1.5rem 0;background:#f9fafb;font-style:italic}.article-body table{width:100%;border-collapse:collapse;margin:1.5rem 0}.article-body td,.article-body th{padding:.75rem;border:1px solid #e5e7eb;text-align:left}.article-body th{background:#f3f4f6;font-weight:600}.related{margin-top:3rem;padding-top:1.5rem;border-top:1px solid #e5e7eb}.related h3{margin-bottom:1rem}.related ul{list-style:none;padding:0}.related li{margin:.5rem 0}.related a{color:var(--primary-color,#991b1b);text-decoration:none}.related a:hover{text-decoration:underline}.section-desc{color:#6b7280;font-size:1.1rem;margin-bottom:2rem;max-width:700px}