*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--navy: #131921;--navy-light: #232f3e;--orange: #ff9900;--orange-hover: #e88b00;--orange-btn: #ffa41c;--white: #ffffff;--off-white: #f3f3f3;--border: #ddd;--text: #111;--text-muted: #555;--sidebar-w: 260px}body{font-family:Segoe UI,Arial,sans-serif;background:var(--off-white);color:var(--text);min-height:100vh}a{color:inherit;text-decoration:none}.site-header{background:var(--navy);color:var(--white);padding:0 24px;display:flex;align-items:center;gap:24px;height:60px;position:sticky;top:0;z-index:100}.site-logo{font-size:1.4rem;font-weight:800;color:var(--orange);white-space:nowrap}.site-logo span{color:var(--white)}.header-tagline{font-size:.8rem;color:#ccc;flex:1}.shell{display:flex;min-height:calc(100vh - 60px)}.sidebar{width:var(--sidebar-w);flex-shrink:0;background:var(--navy-light);color:var(--white);padding:24px 0;position:sticky;top:60px;height:calc(100vh - 60px);overflow-y:auto}.sidebar-heading{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--orange);padding:0 20px 12px;border-bottom:1px solid rgba(255,255,255,.1);margin-bottom:8px}.sidebar-nav{list-style:none}.sidebar-nav li a{display:block;padding:10px 20px;font-size:.9rem;color:#d1d1d1;transition:background .15s,color .15s;border-left:3px solid transparent}.sidebar-nav li a:hover,.sidebar-nav li a.active{background:#ff99001f;color:var(--orange);border-left-color:var(--orange)}.main-content{flex:1;padding:32px 40px;min-width:0}.hero{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:40px;margin-bottom:32px}.hero h1{font-size:2rem;color:var(--navy);margin-bottom:16px}.hero p{font-size:1.05rem;color:var(--text-muted);line-height:1.7;max-width:700px}.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}.category-card{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:24px;transition:box-shadow .15s,border-color .15s}.category-card:hover{box-shadow:0 4px 16px #0000001a;border-color:var(--orange)}.category-card h2{font-size:1rem;color:var(--navy);margin-bottom:8px}.category-card p{font-size:.85rem;color:var(--text-muted);line-height:1.5;margin-bottom:16px}.category-card .see-more{font-size:.85rem;color:var(--orange);font-weight:600}.category-card .see-more:hover{text-decoration:underline}.article-header{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:32px 40px;margin-bottom:28px}.article-header h1{font-size:1.75rem;color:var(--navy);margin-bottom:14px;overflow-wrap:break-word}.article-header .intro{font-size:1rem;color:var(--text-muted);line-height:1.75;max-width:720px}.product-list{display:flex;flex-direction:column;gap:20px}.product-card{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:24px 28px;display:flex;gap:24px;align-items:flex-start;transition:box-shadow .15s}.product-card:hover{box-shadow:0 4px 16px #0000001a}.rank-badge{flex-shrink:0;width:44px;height:44px;border-radius:50%;background:var(--navy);color:var(--orange);font-size:1.1rem;font-weight:800;display:flex;align-items:center;justify-content:center}.product-info{flex:1;min-width:0}.product-info h3{font-size:1.05rem;color:var(--navy);margin-bottom:8px;overflow-wrap:break-word}.product-info p{font-size:.9rem;color:var(--text-muted);line-height:1.65;margin-bottom:14px}.product-footer{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.price{font-size:1.25rem;font-weight:700;color:#b12704}.buy-btn{display:inline-block;background:var(--orange-btn);color:var(--text);font-size:.88rem;font-weight:700;padding:9px 20px;border-radius:20px;border:1px solid #c07b00;cursor:pointer;transition:background .15s;white-space:nowrap}.buy-btn:hover{background:var(--orange-hover);color:var(--white)}.section-heading{font-size:1.2rem;font-weight:700;color:var(--navy-light);margin-bottom:16px;border-left:4px solid var(--orange);padding-left:12px}.related-articles{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:28px 32px;margin-top:40px}.related-articles h2{font-size:1.1rem;color:var(--navy);margin-bottom:16px}.related-articles ul{list-style:none;display:flex;flex-wrap:wrap;gap:12px}.related-articles ul li a{display:inline-block;padding:8px 16px;border:1px solid var(--border);border-radius:20px;font-size:.88rem;color:var(--navy);transition:border-color .15s,color .15s}.related-articles ul li a:hover{border-color:var(--orange);color:var(--orange)}.site-footer{background:var(--navy-light);color:#aaa;text-align:center;font-size:.8rem;padding:20px;margin-top:40px}.menu-toggle{display:none;background:none;border:none;color:var(--white);font-size:1.5rem;cursor:pointer;padding:4px 8px;margin-right:8px}@media(max-width:768px){.menu-toggle{display:block}.shell{flex-direction:column}.sidebar{width:100%;height:auto;position:static;display:none;padding:12px 0}.sidebar.open{display:block}.main-content{padding:20px 16px}.article-header,.hero{padding:24px 20px}.product-card{flex-direction:column;gap:16px;padding:20px}.hero h1{font-size:1.4rem}.category-grid{grid-template-columns:1fr 1fr}}@media(max-width:480px){.category-grid{grid-template-columns:1fr}}