:root{--navy:#0b2545;--navy-mid:#134074;--blue:#1a6fbf;--blue-light:#e8f2fb;--teal:#0891b2;--teal-light:#e0f7fa;--purple:#6d28d9;--green:#059669;--red:#dc2626;--amber:#d97706;--white:#ffffff;--page-bg:#eaf0f6;--gray-50:#f8fafc;--gray-100:#f1f5f9;--gray-200:#e2e8f0;--gray-300:#cbd5e1;--gray-400:#94a3b8;--gray-500:#64748b;--gray-700:#334155;--gray-900:#0f172a;--radius:8px;--radius-lg:14px;--radius-xl:20px;--shadow-xs:0 1px 2px rgba(0,0,0,.06);--shadow-sm:0 2px 6px rgba(0,0,0,.08);--shadow:0 4px 18px rgba(0,0,0,.10);--shadow-lg:0 10px 40px rgba(0,0,0,.14);--shadow-xl:0 20px 60px rgba(0,0,0,.18);--font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;--mono:'Source Code Pro','Fira Code','Consolas',monospace;--max-w:1200px;--box-pad:2rem;--transition:.18s ease}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font);color:var(--gray-700);background:var(--page-bg);background-image:radial-gradient(circle at 20% 20%,rgba(26,111,191,.06) 0%,transparent 50%),radial-gradient(circle at 80% 80%,rgba(8,145,178,.06) 0%,transparent 50%);background-attachment:fixed;line-height:1.65;min-height:100vh}img{max-width:100%;height:auto;display:block}a{color:var(--blue);text-decoration:none;transition:color var(--transition)}a:hover{color:var(--navy-mid);text-decoration:underline}ul,ol{padding-left:1.5rem}strong{font-weight:600}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.container{max-width:var(--max-w);margin:0 auto;padding:0 1.5rem}.box-wrap{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden}h1{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:800;color:var(--navy);line-height:1.2;letter-spacing:-.02em}h2{font-size:1.35rem;font-weight:700;color:var(--gray-900);margin:1.5rem 0 .75rem}h3{font-size:1.05rem;font-weight:600;color:var(--gray-900);margin:1rem 0 .5rem}p{margin-bottom:1rem}.page-subtitle{color:var(--gray-500);font-size:1.05rem;margin-top:.4rem}.page-header{margin-bottom:2rem}.site-header{background:var(--navy);position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(0,0,0,.3);border-bottom:1px solid rgba(255,255,255,.06)}.header-row{display:flex;align-items:center;gap:1.25rem;height:58px}.site-logo{display:flex;align-items:center;flex-shrink:0;text-decoration:none}.site-logo img{display:block;height:34px;width:auto}.site-logo:hover{opacity:.88}.header-search-wrap{flex:1;max-width:520px;position:relative}.header-search-form{display:flex;border-radius:var(--radius);overflow:visible}.header-search-form input{flex:1;padding:.5rem .85rem;font-size:.88rem;background:rgba(255,255,255,.1);border:1.5px solid rgba(255,255,255,.15);border-right:none;border-radius:var(--radius) 0 0 var(--radius);color:var(--white);outline:none;transition:background var(--transition),border-color var(--transition);font-family:var(--font);min-width:0}.header-search-form input::placeholder{color:rgba(255,255,255,.4)}.header-search-form input:focus{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.3)}.header-search-form button{padding:.5rem .85rem;background:var(--teal);border:1.5px solid var(--teal);border-radius:0 var(--radius) var(--radius) 0;cursor:pointer;color:var(--white);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background var(--transition)}.header-search-form button:hover{background:#0e7490;border-color:#0e7490}.search-suggestions{position:absolute;top:calc(100%+4px);left:0;right:0;background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius);box-shadow:var(--shadow-lg);z-index:500;overflow:hidden}.suggestion-item{display:flex;align-items:center;gap:.65rem;padding:.6rem 1rem;cursor:pointer;border-bottom:1px solid var(--gray-100);transition:background var(--transition);text-decoration:none}.suggestion-item:last-child{border-bottom:none}.suggestion-item:hover{background:var(--blue-light)}.sug-name{font-weight:600;color:var(--gray-900);font-size:.88rem}.sug-formula{font-family:var(--mono);color:var(--blue);font-size:.8rem;background:var(--blue-light);padding:.1rem .4rem;border-radius:4px}.main-nav{display:flex;align-items:center;margin-left:auto}.nav-list{list-style:none;padding:0;display:flex;align-items:center;gap:.1rem}.nav-list a{color:rgba(255,255,255,.78);padding:.42rem .75rem;border-radius:var(--radius);font-size:.84rem;font-weight:500;display:block;transition:all var(--transition);white-space:nowrap;text-decoration:none}.nav-list a:hover{background:rgba(255,255,255,.1);color:var(--white);text-decoration:none}.nav-list a.nav-active{color:var(--white)}.nav-toggle{display:none;background:none;border:1.5px solid rgba(255,255,255,.25);border-radius:var(--radius);cursor:pointer;color:var(--white);padding:.35rem .45rem;line-height:0;align-items:center;justify-content:center}.search-suggestions{position:absolute;top:calc(100%+4px);left:0;right:0;background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:500;overflow:hidden}.suggestion-item{display:flex;align-items:center;gap:.75rem;padding:.65rem 1.1rem;cursor:pointer;border-bottom:1px solid var(--gray-100);transition:background var(--transition)}.suggestion-item:last-child{border-bottom:none}.suggestion-item:hover{background:var(--blue-light)}.sug-name{font-weight:600;color:var(--gray-900);font-size:.9rem}.sug-formula{font-family:var(--mono);color:var(--blue);font-size:.82rem;background:var(--blue-light);padding:.1rem .4rem;border-radius:4px}.main-content{padding:0 0 2.5rem}.main-content>.container{padding-top:1.5rem}.main-content>.hp-hero:first-child,.main-content>.cd-hero:first-child{padding-top:1.5rem;margin-top:0}.main-box{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden}.page-body{padding:1.75rem}.inner-page-top{padding-top:1.75rem}.page-layout{display:grid;grid-template-columns:1fr 270px;gap:2rem;align-items:start;padding-top:1.5rem;padding-bottom:2rem}.content-sidebar-layout{display:grid;grid-template-columns:1fr 290px;gap:2rem;align-items:start}.content-main{min-width:0}.content-sidebar{display:flex;flex-direction:column;gap:1.5rem}.page-layout-narrow{max-width:820px}.hero{background:linear-gradient(150deg,var(--navy) 0%,#1a3a6b 50%,#0b2d5a 100%);padding:3.5rem 0 3rem;position:relative;overflow:hidden}.hero::before{content:'';position:absolute;inset:0;background-image:radial-gradient(ellipse 60% 40% at 80% 50%,rgba(8,145,178,.15) 0%,transparent 60%),url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");pointer-events:none}.hero-content{position:relative;z-index:1;max-width:700px}.hero h1{color:var(--white);margin-bottom:.65rem}.hero-sub{color:rgba(255,255,255,.75);font-size:1.1rem;margin-bottom:1.75rem;line-height:1.6}.hero-search{display:flex;max-width:600px;margin-bottom:1.5rem;border-radius:var(--radius-lg);overflow:visible;box-shadow:0 8px 32px rgba(0,0,0,.3);position:relative}.hero-search input{flex:1;padding:.9rem 1.3rem;font-size:1rem;border:none;border-radius:var(--radius-lg) 0 0 var(--radius-lg);outline:none;font-family:var(--font);color:var(--gray-900)}.hero-search button{padding:.9rem 1.6rem;background:var(--teal);color:var(--white);border:none;border-radius:0 var(--radius-lg) var(--radius-lg) 0;cursor:pointer;font-weight:700;font-size:.95rem;transition:background var(--transition);display:flex;align-items:center;gap:.4rem}.hero-search button:hover{background:#0e7490}.hero-hint{color:rgba(255,255,255,.6);font-size:.85rem}.hero-alpha{display:flex;flex-wrap:wrap;gap:3px;margin-top:.75rem}.alpha-link{display:inline-block;width:26px;height:26px;line-height:26px;text-align:center;border-radius:5px;font-size:.78rem;font-weight:700;color:rgba(255,255,255,.8);background:rgba(255,255,255,.1);transition:background var(--transition);text-decoration:none}.alpha-link.has-entries:hover{background:var(--teal);color:var(--white);text-decoration:none}.alpha-link.empty{opacity:.3;pointer-events:none}.hero-stats{display:flex;gap:2rem;margin-top:2rem;flex-wrap:wrap}.hero-stat{display:flex;flex-direction:column}.hero-stat-num{font-size:1.6rem;font-weight:800;color:var(--white);line-height:1}.hero-stat-label{font-size:.75rem;color:rgba(255,255,255,.6);margin-top:.2rem}.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.4rem;padding-bottom:.75rem;border-bottom:2px solid var(--gray-100)}.section-head h2{margin:0;font-size:1.2rem;display:flex;align-items:center;gap:.5rem}.section-head h2::before{content:'';display:inline-block;width:4px;height:1.1em;background:var(--blue);border-radius:2px;flex-shrink:0}.section-head .btn-link{font-size:.85rem;color:var(--blue);font-weight:600}.section-title-icon{font-size:1rem}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1.1rem}.card-grid-sm{grid-template-columns:repeat(auto-fill,minmax(185px,1fr));gap:.85rem}.chem-card{border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;display:flex;flex-direction:column;background:var(--white);transition:transform var(--transition),box-shadow var(--transition),border-color var(--transition)}.chem-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--blue)}.chem-card-top{background:linear-gradient(135deg,var(--navy-mid),var(--blue));padding:1rem 1rem .8rem;display:flex;align-items:center;gap:.75rem}.chem-card-letter{width:44px;height:44px;background:rgba(255,255,255,.18);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.4rem;font-weight:800;color:var(--white);flex-shrink:0}.chem-card-title{color:var(--white);font-size:.95rem;font-weight:700;line-height:1.2}.chem-card-formula{color:rgba(255,255,255,.7);font-family:var(--mono);font-size:.78rem;margin-top:.2rem}.chem-card-body{padding:.85rem 1rem;flex:1}.chem-card-excerpt{font-size:.82rem;color:var(--gray-500);line-height:1.55;margin:0}.chem-card-footer{padding:.55rem 1rem;border-top:1px solid var(--gray-100);display:flex;align-items:center;justify-content:space-between;font-size:.8rem}.chem-card-cat{color:var(--gray-400)}.chem-card-link{color:var(--blue);font-weight:600}.chem-card-link:hover{text-decoration:none;color:var(--navy-mid)}.alpha-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(68px,1fr));gap:.6rem}.alpha-box{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:.8rem .4rem;border-radius:var(--radius);border:2px solid var(--gray-200);background:var(--white);text-decoration:none;transition:all var(--transition);gap:.15rem;box-shadow:var(--shadow-xs)}.alpha-box:hover{border-color:var(--blue);background:var(--blue-light);box-shadow:var(--shadow-sm);text-decoration:none}.alpha-box.empty{opacity:.35;pointer-events:none}.alpha-box .letter{font-size:1.35rem;font-weight:800;color:var(--navy)}.alpha-box .count{font-size:.68rem;color:var(--gray-400);font-weight:500}.az-nav{display:flex;flex-wrap:wrap;gap:.3rem;margin-bottom:1.5rem}.az-link{display:inline-flex;flex-direction:column;align-items:center;padding:.4rem .55rem;border-radius:var(--radius);background:var(--gray-100);color:var(--gray-700);font-weight:700;font-size:.88rem;min-width:38px;text-align:center;text-decoration:none;transition:all var(--transition);border:1.5px solid transparent}.az-link .az-count{font-size:.62rem;font-weight:400;opacity:.75}.az-link.active{background:var(--blue);color:var(--white);border-color:var(--blue)}.az-link.empty{opacity:.35;cursor:default}.az-link:hover:not(.empty):not(.active){background:var(--blue-light);border-color:var(--blue);text-decoration:none}.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem}.cat-card{display:flex;flex-direction:column;gap:.35rem;padding:1.1rem 1.2rem;border:1.5px solid var(--gray-200);border-radius:var(--radius);background:var(--white);text-decoration:none;transition:all var(--transition);box-shadow:var(--shadow-xs)}.cat-card:hover{border-color:var(--blue);background:var(--blue-light);text-decoration:none;box-shadow:var(--shadow-sm)}.cat-name{font-weight:700;color:var(--navy)}.cat-desc{font-size:.8rem;color:var(--gray-500)}.cat-grid-full{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}.cat-card-full{display:flex;flex-direction:column;gap:.6rem;padding:1.3rem 1.5rem;border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);background:var(--white);text-decoration:none;transition:all var(--transition);box-shadow:var(--shadow-xs)}.cat-card-full:hover{border-color:var(--blue);box-shadow:var(--shadow);text-decoration:none}.cat-card-header{display:flex;justify-content:space-between;align-items:center}.cat-card-header h2{margin:0;font-size:1.05rem;color:var(--navy)}.cat-count{font-size:.78rem;background:var(--blue-light);color:var(--blue);padding:.2rem .65rem;border-radius:99px;font-weight:600}.cat-card-full p{font-size:.88rem;color:var(--gray-500);margin:0}.cat-cta{font-size:.84rem;color:var(--blue);font-weight:600;margin-top:auto}.chem-list-grid{display:flex;flex-direction:column;gap:.7rem}.chem-list-item{display:flex;align-items:flex-start;gap:1rem;padding:1rem 1.2rem;border:1.5px solid var(--gray-200);border-radius:var(--radius);background:var(--white);transition:all var(--transition);box-shadow:var(--shadow-xs)}.chem-list-item:hover{border-color:var(--blue);box-shadow:var(--shadow-sm)}.chem-list-num{flex-shrink:0;width:32px;height:32px;background:var(--blue-light);color:var(--blue);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.78rem}.chem-list-main{flex:1;min-width:0}.chem-list-name{font-size:1rem;margin:0 0 .3rem}.chem-list-name a{color:var(--navy);font-weight:700}.chem-list-name a:hover{color:var(--blue)}.chem-list-meta{display:flex;flex-wrap:wrap;gap:.35rem .7rem;margin-bottom:.35rem;font-size:.79rem}.chem-formula{font-family:var(--mono);color:var(--blue);font-weight:700;background:var(--blue-light);padding:.1rem .4rem;border-radius:4px}.chem-cas{color:var(--gray-500);font-family:var(--mono);font-size:.78rem}.chem-cat{background:var(--teal-light);color:var(--teal);padding:.15rem .5rem;border-radius:4px;font-weight:500}.chem-list-desc{font-size:.86rem;color:var(--gray-500);margin:0;line-height:1.5}.btn-view{flex-shrink:0;padding:.4rem .9rem;font-size:.82rem;background:var(--blue-light);color:var(--blue);border-radius:var(--radius);font-weight:600;transition:all var(--transition);border:1.5px solid transparent}.btn-view:hover{background:var(--blue);color:var(--white);text-decoration:none}.breadcrumb{margin-bottom:1.5rem}.breadcrumb ol{list-style:none;padding:0;display:flex;flex-wrap:wrap;align-items:center;gap:.2rem;font-size:.81rem}.breadcrumb li{display:flex;align-items:center;gap:.2rem;color:var(--gray-400)}.breadcrumb a{color:var(--gray-500)}.breadcrumb a:hover{color:var(--blue);text-decoration:none}.breadcrumb .sep{color:var(--gray-300)}.print-bar{background:linear-gradient(90deg,var(--blue-light),#f0f4ff);border-bottom:1px solid #d0dff5;padding:.55rem 0}.print-bar .container{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.print-breadcrumb{color:var(--gray-500);font-size:.83rem}.print-breadcrumb a{color:var(--blue)}.btn-print{display:inline-flex;align-items:center;gap:.4rem;background:var(--blue);color:var(--white);border:none;border-radius:var(--radius);padding:.45rem 1.1rem;font-size:.83rem;font-weight:700;cursor:pointer;transition:background var(--transition);font-family:var(--font)}.btn-print:hover{background:var(--navy-mid)}.chem-hero-banner{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-mid) 50%,var(--blue) 100%);color:var(--white);padding:2.2rem var(--box-pad);position:relative;overflow:hidden}.chem-hero-banner::after{content:attr(data-letter);position:absolute;right:-10px;top:-20px;font-size:10rem;font-weight:900;color:rgba(255,255,255,.04);line-height:1;pointer-events:none;letter-spacing:-.05em}.chem-hero-inner{display:flex;align-items:center;gap:1.5rem;position:relative;z-index:1}.chem-letter-badge{width:72px;height:72px;background:rgba(255,255,255,.12);border:2px solid rgba(255,255,255,.25);border-radius:18px;display:flex;align-items:center;justify-content:center;font-size:2.4rem;font-weight:900;color:var(--white);flex-shrink:0;backdrop-filter:blur(6px)}.chem-hero-info{flex:1;min-width:0}.chem-hero-name{font-size:2rem;font-weight:900;margin:0 0 .25rem;color:var(--white);letter-spacing:-.02em}.chem-iupac{font-size:.88rem;color:rgba(255,255,255,.7);margin:0 0 .6rem}.chem-hero-badges{display:flex;gap:.45rem;flex-wrap:wrap;margin-top:.5rem}.badge{display:inline-flex;align-items:center;padding:.28rem .75rem;border-radius:20px;font-size:.78rem;font-weight:600;letter-spacing:.01em}.badge-formula{background:rgba(255,255,255,.18);color:var(--white);font-family:var(--mono)}.badge-category{background:rgba(8,145,178,.3);color:rgba(255,255,255,.95);text-decoration:none;border:1px solid rgba(8,145,178,.5)}.badge-category:hover{background:rgba(8,145,178,.5);color:var(--white);text-decoration:none}.badge-cas{background:rgba(0,0,0,.2);color:rgba(255,255,255,.85);font-family:var(--mono);font-size:.72rem}.quick-ref-card{background:var(--white);border:1.5px solid #d0dff5;border-radius:var(--radius-lg);overflow:hidden;margin:1.5rem 0;box-shadow:var(--shadow-xs)}.quick-ref-title{background:var(--navy);color:var(--white);font-size:.88rem;font-weight:700;padding:.65rem 1.25rem;letter-spacing:.05em;text-transform:uppercase;display:flex;align-items:center;gap:.5rem}.quick-ref-title::before{content:'⊞';font-size:1rem}.quick-ref-table{width:100%;border-collapse:collapse}.quick-ref-table th{width:36%;text-align:left;padding:.55rem 1rem;font-weight:600;color:var(--gray-700);font-size:.83rem;background:#f5f8ff;border:1px solid #e2eaf8}.quick-ref-table td{padding:.55rem 1rem;font-size:.88rem;border:1px solid #e2eaf8;color:var(--gray-700)}.formula-cell{font-family:var(--mono);color:var(--blue);font-weight:700;font-size:.9rem}.chem-section{margin:2rem 0;padding-bottom:1.75rem;border-bottom:1px solid var(--gray-100)}.chem-section:last-of-type{border-bottom:none}.chem-section h2{font-size:1.3rem;font-weight:800;color:var(--navy);margin:0 0 1rem;padding:.5rem 1rem;background:linear-gradient(90deg,var(--blue-light),transparent);border-left:4px solid var(--blue);border-radius:0 var(--radius) var(--radius) 0}.safety-section h2{background:linear-gradient(90deg,#fff7ed,transparent);border-left-color:var(--red)}.chem-section-body{line-height:1.8;color:var(--gray-700);font-size:.96rem}.chem-description p{font-size:1.05rem;line-height:1.85}.section-intro{color:var(--gray-500);font-size:.92rem;margin-bottom:1rem}.formula-display-box{background:linear-gradient(135deg,#f0f4ff,#e8f2fb);border:2px solid #c7d8f0;border-radius:var(--radius-lg);padding:1.5rem;text-align:center;margin:1rem 0}.formula-display{font-family:var(--mono);font-size:1.4rem;font-weight:700;color:var(--blue);line-height:1.6;word-break:break-all}.data-table{width:100%;border-collapse:collapse;margin-top:1rem;font-size:.9rem}.data-table th{background:var(--gray-50);color:var(--gray-700);font-weight:600;padding:.55rem .9rem;text-align:left;border:1px solid var(--gray-200);font-size:.82rem}.data-table td{padding:.55rem .9rem;border:1px solid var(--gray-200)}.data-table tr:nth-child(even) td{background:#fafbff}.safety-box{background:#fff7ed;border:1.5px solid #fbbf24;border-left:4px solid var(--red);border-radius:var(--radius);padding:1.1rem 1.25rem;display:flex;gap:.75rem}.safety-box::before{content:'⚠';font-size:1.1rem;flex-shrink:0;color:var(--red)}.safety-box p{margin:0;font-size:.91rem;color:#7c2d12;line-height:1.7}.key-facts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.85rem;margin-top:.75rem}.fact-card{background:var(--gray-50);border:1.5px solid var(--gray-200);border-radius:var(--radius);padding:.9rem 1rem;display:flex;flex-direction:column;gap:.2rem}.fact-label{font-size:.72rem;color:var(--gray-400);font-weight:700;text-transform:uppercase;letter-spacing:.06em}.fact-value{font-size:.95rem;font-weight:700;color:var(--navy);font-family:var(--mono)}.faq-list{margin-top:1rem;display:flex;flex-direction:column;gap:.6rem}.faq-item{border:1.5px solid var(--gray-200);border-radius:var(--radius);overflow:hidden;background:var(--white)}.faq-question{width:100%;text-align:left;background:none;border:none;cursor:pointer;padding:.9rem 1.2rem;display:flex;justify-content:space-between;align-items:center;gap:1rem;font-family:var(--font);font-size:.92rem;font-weight:600;color:var(--navy);transition:background var(--transition)}.faq-question:hover{background:var(--gray-50)}.faq-question[aria-expanded="true"]{background:var(--blue-light);color:var(--blue)}.faq-icon{flex-shrink:0;width:22px;height:22px;border-radius:50%;background:var(--gray-200);color:var(--gray-600);display:flex;align-items:center;justify-content:center;font-size:.9rem;font-weight:700;transition:all var(--transition)}.faq-question[aria-expanded="true"] .faq-icon{background:var(--blue);color:var(--white)}.faq-answer{padding:.9rem 1.2rem;font-size:.9rem;color:var(--gray-700);line-height:1.75;border-top:1px solid var(--gray-100)}.faq-answer[hidden]{display:none}.related-cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:.85rem}.related-card{border:1.5px solid var(--gray-200);border-radius:var(--radius);padding:.9rem 1rem;display:flex;flex-direction:column;gap:.3rem;background:var(--white);transition:all var(--transition);text-decoration:none;box-shadow:var(--shadow-xs)}.related-card:hover{border-color:var(--blue);background:var(--blue-light);text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-sm)}.related-card-name{font-weight:700;color:var(--navy);font-size:.9rem}.related-card-formula{font-family:var(--mono);font-size:.78rem;color:var(--blue)}.related-card-desc{font-size:.78rem;color:var(--gray-500);line-height:1.5;margin-top:.2rem}.same-letter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:.5rem;margin-top:.75rem}.same-letter-item{display:flex;flex-direction:column;gap:.1rem;padding:.55rem .75rem;border:1px solid var(--gray-200);border-radius:var(--radius);background:var(--white);text-decoration:none;transition:all var(--transition);font-size:.82rem}.same-letter-item:hover{border-color:var(--blue);background:var(--blue-light);text-decoration:none}.same-letter-item .item-name{font-weight:600;color:var(--navy)}.same-letter-item .item-formula{font-family:var(--mono);font-size:.72rem;color:var(--blue)}.az-browse-bar{display:flex;flex-wrap:wrap;gap:.25rem;margin-top:1rem}.az-browse-bar a{display:inline-block;width:28px;height:28px;line-height:28px;text-align:center;border-radius:5px;font-size:.78rem;font-weight:700;background:var(--gray-100);color:var(--gray-700);text-decoration:none;transition:all var(--transition)}.az-browse-bar a:hover,.az-browse-bar a.active{background:var(--blue);color:var(--white);text-decoration:none}.sidebar-widget{background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xs)}.sidebar-widget-head{background:var(--gray-50);padding:.7rem 1.1rem;border-bottom:1px solid var(--gray-200);font-size:.82rem;font-weight:700;color:var(--navy);text-transform:uppercase;letter-spacing:.06em;display:flex;align-items:center;gap:.4rem}.sidebar-widget-body{padding:1rem 1.1rem}.sidebar-widget h3{font-size:.88rem;margin:0 0 .75rem;color:var(--navy);font-weight:700;text-transform:uppercase;letter-spacing:.05em}.toc-list{list-style:none;padding:0}.toc-list li+li{border-top:1px solid var(--gray-100)}.toc-list a{display:flex;align-items:center;gap:.4rem;padding:.45rem 0;font-size:.84rem;color:var(--gray-600);transition:all var(--transition)}.toc-list a:hover{color:var(--blue);text-decoration:none}.toc-list a.toc-active{color:var(--blue);font-weight:600;padding-left:.5rem}.toc-list a::before{content:'';display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--gray-300);flex-shrink:0;transition:background var(--transition)}.toc-list a.toc-active::before{background:var(--blue)}.sidebar-alpha{display:flex;flex-wrap:wrap;gap:.2rem}.sidebar-alpha a{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:5px;font-size:.78rem;font-weight:700;background:var(--gray-100);color:var(--gray-600);text-decoration:none;transition:all var(--transition)}.sidebar-alpha a:hover,.sidebar-alpha a.active{background:var(--blue);color:var(--white);text-decoration:none}.sidebar-alpha-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:.2rem}.sidebar-alpha-grid a{display:flex;align-items:center;justify-content:center;height:26px;border-radius:4px;font-size:.75rem;font-weight:700;background:var(--gray-100);color:var(--gray-600);text-decoration:none;transition:all var(--transition)}.sidebar-alpha-grid a:hover{background:var(--blue);color:var(--white);text-decoration:none}.sidebar-cats{list-style:none;padding:0}.sidebar-cats li+li{border-top:1px solid var(--gray-100)}.sidebar-cats a{display:flex;align-items:center;justify-content:space-between;padding:.4rem 0;font-size:.85rem;color:var(--gray-700);transition:color var(--transition)}.sidebar-cats a:hover{color:var(--blue);text-decoration:none}.sidebar-articles{list-style:none;padding:0}.sidebar-articles li+li{border-top:1px solid var(--gray-100)}.sidebar-articles a{display:block;padding:.5rem 0;font-size:.84rem;color:var(--gray-700);line-height:1.45;transition:color var(--transition)}.sidebar-articles a:hover{color:var(--blue);text-decoration:none}.sidebar-same-letter{list-style:none;padding:0}.sidebar-same-letter li+li{border-top:1px solid var(--gray-100)}.sidebar-same-letter a{display:flex;align-items:center;justify-content:space-between;padding:.38rem 0;font-size:.83rem;color:var(--gray-700);transition:color var(--transition)}.sidebar-same-letter a:hover{color:var(--blue);text-decoration:none}.sidebar-same-letter .item-fml{font-family:var(--mono);font-size:.72rem;color:var(--gray-400)}.sidebar-ad-label,.ad-label{font-size:.68rem;color:var(--gray-300);text-align:center;margin-bottom:.3rem}.article-list{display:flex;flex-direction:column;gap:1.5rem}.article-item{border-bottom:1px solid var(--gray-100);padding-bottom:1.5rem}.article-meta{display:flex;align-items:center;gap:.7rem;margin-bottom:.4rem;font-size:.8rem;color:var(--gray-500)}.article-cat{background:var(--blue-light);color:var(--blue);padding:.15rem .55rem;border-radius:4px;font-weight:600}.article-item h3{margin:0 0 .4rem;font-size:1rem}.article-item h3 a{color:var(--navy);font-weight:700}.article-item h3 a:hover{color:var(--blue)}.article-list-full{display:flex;flex-direction:column;gap:1.5rem}.article-card{border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);padding:1.5rem;transition:all var(--transition);background:var(--white);box-shadow:var(--shadow-xs)}.article-card:hover{border-color:var(--blue);box-shadow:var(--shadow-sm)}.article-card h2{margin:.4rem 0 .7rem;font-size:1.2rem}.article-card h2 a{color:var(--navy)}.article-card h2 a:hover{color:var(--blue)}.article-excerpt{color:var(--gray-500);margin-bottom:1rem;font-size:.92rem}.read-more{font-size:.86rem;font-weight:700;color:var(--blue)}.read-more:hover{text-decoration:none;color:var(--navy-mid)}.article-full .article-header{padding-bottom:1.5rem;border-bottom:2px solid var(--gray-100);margin-bottom:2rem}.article-full h1{margin:.4rem 0 .7rem}.article-lead{font-size:1.05rem;color:var(--gray-500);font-style:italic}.article-body{line-height:1.8}.article-body h2{margin-top:2rem;border-left:3px solid var(--blue);padding-left:.75rem}.article-body h3{margin-top:1.5rem}.article-body ul,.article-body ol{margin-bottom:1rem}.article-body li{margin-bottom:.3rem}.article-body p{line-height:1.85}.article-views{color:var(--gray-400);font-size:.82rem}.article-tags{margin-top:1.5rem;display:flex;gap:.4rem;flex-wrap:wrap;align-items:center}.tag{background:var(--gray-100);color:var(--gray-700);padding:.25rem .7rem;border-radius:99px;font-size:.78rem;font-weight:500}.share-section{display:flex;align-items:center;gap:.5rem;margin:1.5rem 0;flex-wrap:wrap}.share-label{font-size:.85rem;font-weight:600;color:var(--gray-500)}.share-btn{padding:.35rem .9rem;border-radius:var(--radius);font-size:.81rem;font-weight:700;transition:filter var(--transition)}.share-twitter{background:#e7f3fc;color:#1a8cd8}.share-facebook{background:#e8f0fe;color:#1877f2}.share-btn:hover{filter:brightness(.9);text-decoration:none}.info-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1.25rem}.info-box{padding:1.5rem;border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);background:var(--white);box-shadow:var(--shadow-xs);transition:all var(--transition)}.info-box:hover{border-color:var(--blue);box-shadow:var(--shadow-sm)}.info-icon{font-size:1.9rem;margin-bottom:.7rem}.info-box h3{margin:0 0 .5rem;font-size:1rem}.info-box p{margin:0;font-size:.87rem;color:var(--gray-500)}.stats-box{display:flex;gap:2rem;margin-top:2rem;padding:1.5rem 2rem;background:linear-gradient(135deg,var(--navy),var(--navy-mid));border-radius:var(--radius-lg);flex-wrap:wrap}.stat{text-align:center;flex:1;min-width:80px}.stat-number{display:block;font-size:2rem;font-weight:800;color:var(--white);line-height:1.1}.stat-label{font-size:.78rem;color:rgba(255,255,255,.6);margin-top:.25rem;display:block}.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.6rem 1.25rem;border-radius:var(--radius);font-weight:700;font-size:.9rem;cursor:pointer;border:2px solid transparent;transition:all var(--transition);text-decoration:none;font-family:var(--font)}.btn-primary{background:var(--blue);color:var(--white);border-color:var(--blue)}.btn-primary:hover{background:var(--navy-mid);border-color:var(--navy-mid);text-decoration:none;color:var(--white)}.btn-outline{border-color:var(--gray-300);color:var(--gray-700);background:var(--white)}.btn-outline:hover{border-color:var(--blue);color:var(--blue);background:var(--blue-light);text-decoration:none}.btn-link{font-size:.88rem;color:var(--blue);font-weight:700;background:none;border:none;cursor:pointer;padding:0;font-family:var(--font)}.btn-link:hover{text-decoration:underline;color:var(--navy-mid)}.form-group{display:flex;flex-direction:column;gap:.3rem}.form-group label{font-size:.86rem;font-weight:600;color:var(--gray-700)}.form-group input,.form-group textarea,.form-group select{padding:.6rem .9rem;border:2px solid var(--gray-200);border-radius:var(--radius);font-size:.92rem;outline:none;font-family:var(--font);transition:border-color var(--transition);background:var(--white);color:var(--gray-900)}.form-group input:focus,.form-group textarea:focus,.form-group select:focus{border-color:var(--blue)}.contact-form{display:flex;flex-direction:column;gap:.9rem;max-width:620px}.search-form-wrap{margin-bottom:2rem}.search-form-large{display:flex;max-width:600px}.search-form-large input{flex:1;padding:.7rem 1rem;border:2px solid var(--gray-200);border-right:none;border-radius:var(--radius) 0 0 var(--radius);font-size:1rem;outline:none;font-family:var(--font)}.search-form-large input:focus{border-color:var(--blue)}.search-form-large .btn{border-radius:0 var(--radius) var(--radius) 0}.required{color:var(--red)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.alert{padding:.9rem 1.1rem;border-radius:var(--radius);margin-bottom:1.25rem;font-size:.9rem;border:1.5px solid}.alert-success{background:#f0fdf4;border-color:#86efac;color:#15803d}.alert-error{background:#fef2f2;border-color:#fca5a5;color:#b91c1c}.alert ul{margin:.4rem 0 0;padding-left:1.2rem}.empty-state{text-align:center;padding:3.5rem 1rem;color:var(--gray-500)}.empty-state h2{color:var(--gray-700);margin-bottom:.75rem}.empty-state ul{text-align:left;display:inline-block;margin:.75rem 0}.error-box{max-width:520px;margin:3rem auto;text-align:center;padding:2.5rem;border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);background:var(--white);box-shadow:var(--shadow)}.error-box h1{margin-bottom:1rem}.pagination ul{list-style:none;padding:0;display:flex;gap:.3rem;flex-wrap:wrap;margin-top:2rem;align-items:center}.pagination li a{display:inline-flex;align-items:center;justify-content:center;min-width:36px;height:36px;padding:0 .6rem;border-radius:var(--radius);background:var(--white);color:var(--gray-700);font-size:.86rem;font-weight:600;border:1.5px solid var(--gray-200);transition:all var(--transition)}.pagination li.active a{background:var(--blue);color:var(--white);border-color:var(--blue)}.pagination li a:hover{background:var(--blue-light);border-color:var(--blue);text-decoration:none}.pagination li.ellipsis span{padding:0 .5rem;color:var(--gray-400)}.tips-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;margin:1.25rem 0}.tip{padding:1rem;background:var(--gray-50);border-radius:var(--radius);font-size:.87rem;border:1px solid var(--gray-200)}.content-page{max-width:820px}.content-page h2{margin-top:2rem}.content-page ul,.content-page ol{margin-bottom:1rem}.content-page li{margin-bottom:.4rem}.last-updated{color:var(--gray-400);font-size:.85rem;margin-bottom:1.5rem}.safety-warning-box{background:#fff7ed;border:1.5px solid #fbbf24;border-left:4px solid var(--red);border-radius:var(--radius);padding:1.25rem;margin:1.25rem 0}.ad-wrapper{margin:1.5rem 0}.ad-top{padding:0}.browse-seo-text{background:linear-gradient(135deg,#f8faff,var(--gray-50));border:1px solid var(--gray-200);border-radius:var(--radius-lg);padding:1.5rem;margin-top:2.5rem}.browse-seo-text h2{margin-top:0}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.4rem;padding-bottom:.75rem;border-bottom:2px solid var(--gray-100)}.section-header h2{margin:0;font-size:1.2rem}.chem-detail-layout{padding-bottom:2rem}.sidebar-widget{padding:0}.sidebar-widget h3{background:var(--gray-50);padding:.6rem 1rem;border-bottom:1px solid var(--gray-200);font-size:.75rem;font-weight:700;color:var(--navy);text-transform:uppercase;letter-spacing:.07em;margin:0}.sidebar-widget>*:not(h3){padding:0 1rem}.sidebar-widget .toc-list{padding:.5rem 0}.sidebar-widget .toc-list li{padding:0}.sidebar-widget .toc-list a{padding:.4rem 1rem;display:flex;align-items:center;gap:.4rem;font-size:.84rem;color:var(--gray-600);border-bottom:1px solid var(--gray-100)}.sidebar-widget .toc-list li:last-child a{border-bottom:none}.sidebar-widget .toc-list a:hover{color:var(--blue);background:var(--blue-light);text-decoration:none}.sidebar-widget .toc-list a.toc-active{color:var(--blue);font-weight:600}.sidebar-widget .sidebar-alpha-grid{padding:.75rem 1rem}.sidebar-widget .sidebar-cats{padding:0}.sidebar-widget .sidebar-cats a{padding:.4rem 1rem}.sidebar-widget .sidebar-articles{padding:0}.sidebar-widget .sidebar-articles a{padding:.45rem 1rem;border-bottom:1px solid var(--gray-100);display:block}.sidebar-widget .sidebar-articles li:last-child a{border-bottom:none}.sidebar-term-list{list-style:none;padding:0 !important;margin:0}.sidebar-term-list li{border-bottom:1px solid var(--gray-100)}.sidebar-term-list li:last-child{border-bottom:none}.sidebar-term-list a{display:flex;align-items:center;justify-content:space-between;padding:.45rem 1rem;font-size:.84rem;color:var(--gray-700);transition:all var(--transition)}.sidebar-term-list a:hover{color:var(--blue);background:var(--blue-light);text-decoration:none}.sidebar-formula{font-family:var(--mono);font-size:.72rem;color:var(--blue);background:var(--blue-light);padding:.1rem .35rem;border-radius:3px}.sidebar-more-link{display:block;padding:.5rem 1rem;font-size:.82rem;color:var(--blue);font-weight:600;border-top:1px solid var(--gray-100)}.sidebar-more-link:hover{background:var(--blue-light);text-decoration:none}.sidebar-alpha-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:.25rem}.sidebar-alpha-item,.sidebar-alpha-grid a{display:flex;align-items:center;justify-content:center;height:28px;border-radius:5px;font-size:.77rem;font-weight:700;background:var(--gray-100);color:var(--gray-600);text-decoration:none;transition:all var(--transition)}.sidebar-alpha-item:hover,.sidebar-alpha-grid a:hover,.sidebar-alpha-item.active,.sidebar-alpha-grid a.active{background:var(--blue);color:var(--white);text-decoration:none}.key-facts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.85rem;margin-top:.75rem}.key-fact-item,.fact-card{background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius);padding:.85rem 1rem;display:flex;flex-direction:column;gap:.25rem}.key-fact-label,.fact-label{font-size:.7rem;color:var(--gray-400);font-weight:700;text-transform:uppercase;letter-spacing:.06em}.key-fact-value,.fact-value{font-size:.93rem;font-weight:700;color:var(--navy)}.key-fact-value.formula-text{font-family:var(--mono);color:var(--blue)}.key-fact-wide{grid-column:span 2}@media (max-width:480px){.key-fact-wide{grid-column:span 1}}.same-letter-item{display:flex;flex-direction:column;gap:.15rem}.sl-name,.same-letter-item .item-name{font-weight:600;color:var(--navy);font-size:.84rem}.sl-formula,.same-letter-item .item-formula{font-family:var(--mono);font-size:.72rem;color:var(--blue)}.az-browse-bar a,.az-browse-item{display:inline-block;width:28px;height:28px;line-height:28px;text-align:center;border-radius:5px;font-size:.78rem;font-weight:700;background:var(--gray-100);color:var(--gray-700);text-decoration:none;transition:all var(--transition);border:1.5px solid transparent}.az-browse-bar a:hover,.az-browse-item:hover{background:var(--blue);color:var(--white);text-decoration:none}.az-browse-bar a.current,.az-browse-item.current{background:var(--blue);color:var(--white)}.view-all-link{margin-top:1rem}.safety-disclaimer{font-size:.8rem;color:var(--gray-400);margin-top:.75rem;font-style:italic}.chem-section-body{line-height:1.8;color:var(--gray-700);font-size:.96rem}.chem-section-body p{margin-bottom:.75rem}.print-bar{background:#f5f8ff;border-bottom:1px solid #dde6f5;padding:.5rem 0}.print-bar .container{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;min-height:auto}.print-breadcrumb{font-size:.8rem;color:var(--gray-500)}.print-breadcrumb a{color:var(--blue)}.btn-print{display:inline-flex;align-items:center;gap:.4rem;background:var(--blue);color:var(--white);border:none;border-radius:var(--radius);padding:.4rem 1rem;font-size:.82rem;font-weight:700;cursor:pointer;font-family:var(--font)}.btn-print:hover{background:var(--navy-mid)}.chem-hero-banner{margin:0}.safety-box{display:flex;gap:.75rem;align-items:flex-start}.safety-icon{font-size:1.1rem;flex-shrink:0;color:var(--red);padding-top:.1rem}.safety-content{flex:1;line-height:1.75;font-size:.91rem;color:#7c2d12}.quick-ref-title{background:var(--navy);color:var(--white);padding:.6rem 1rem;font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin:0;border-radius:0;display:flex;align-items:center;gap:.5rem}.formula-display-box{background:#f0f6ff;border:2px dashed #bfcfeb;border-radius:var(--radius);padding:1.25rem;text-align:center;margin:1rem 0}.formula-display{font-family:var(--mono);font-size:1.3rem;font-weight:700;color:var(--blue);line-height:1.6;word-break:break-all}.toc-widget{overflow:hidden}.toc-widget nav{margin:0}.container.inner-pad{padding-top:1.5rem}.related-chemicals{margin-top:2.5rem;padding-top:2rem;border-top:2px solid var(--gray-100)}.letter-nav{margin-top:1.5rem}.back-link{margin-top:1.5rem}.contact-info{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--gray-200)}.print-only{display:none}.site-footer{background:var(--navy);color:rgba(255,255,255,.7);margin-top:2.5rem}.footer-banner{background:linear-gradient(90deg,#134074,#1a6fbf);padding:1.1rem 0;border-bottom:1px solid rgba(255,255,255,.06)}.footer-banner-inner{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}.footer-banner-text{font-size:.88rem;color:rgba(255,255,255,.8)}.footer-banner-text strong{color:var(--white)}.footer-banner-letters{display:flex;flex-wrap:wrap;gap:3px}.footer-banner-letters a{display:inline-block;width:24px;height:24px;line-height:24px;text-align:center;background:rgba(255,255,255,.12);border-radius:4px;color:rgba(255,255,255,.75);font-size:.72rem;font-weight:700;text-decoration:none;transition:background var(--transition)}.footer-banner-letters a:hover{background:var(--teal);color:var(--white);text-decoration:none}.footer-main{padding:3rem 0 2.5rem}.footer-grid{display:grid;grid-template-columns:2.2fr 1fr 1fr 1.4fr;gap:2.5rem}.footer-logo{display:flex;align-items:center;gap:.6rem;color:var(--white);font-size:1.15rem;font-weight:800;text-decoration:none;margin-bottom:.9rem}.footer-logo:hover{color:var(--white);text-decoration:none}.footer-logo-mark{width:36px;height:36px;background:linear-gradient(135deg,var(--teal),var(--blue));border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.1rem}.footer-about p{font-size:.84rem;line-height:1.7;margin-bottom:.5rem;color:rgba(255,255,255,.6)}.footer-total{font-size:.82rem;color:rgba(255,255,255,.5)}.footer-total strong{color:rgba(255,255,255,.85)}.footer-col h4{color:var(--white);font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:1px solid rgba(255,255,255,.08)}.footer-col ul{list-style:none;padding:0}.footer-col ul li+li{margin-top:.4rem}.footer-col a{color:rgba(255,255,255,.6);font-size:.84rem;transition:color var(--transition);display:flex;align-items:center;gap:.4rem}.footer-col a:hover{color:var(--white);text-decoration:none}.footer-col a::before{content:'›';color:rgba(255,255,255,.3)}.footer-letter-grid{display:flex;flex-wrap:wrap;gap:.2rem}.footer-letter-grid a{display:inline-block;width:22px;height:22px;line-height:22px;text-align:center;background:rgba(255,255,255,.08);border-radius:4px;color:rgba(255,255,255,.65);font-size:.72rem;font-weight:700;text-decoration:none;transition:all var(--transition)}.footer-letter-grid a:hover{background:var(--teal);color:var(--white);text-decoration:none}.footer-subscribe{margin-top:1rem}.footer-subscribe p{font-size:.8rem;color:rgba(255,255,255,.55);margin-bottom:.6rem}.footer-subscribe-form{display:flex;gap:0}.footer-subscribe-form input{flex:1;padding:.5rem .8rem;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);border-right:none;border-radius:var(--radius) 0 0 var(--radius);color:var(--white);font-size:.82rem;outline:none;font-family:var(--font)}.footer-subscribe-form input::placeholder{color:rgba(255,255,255,.35)}.footer-subscribe-form button{padding:.5rem .85rem;background:var(--teal);border:1px solid var(--teal);border-radius:0 var(--radius) var(--radius) 0;color:var(--white);font-size:.8rem;font-weight:700;cursor:pointer;font-family:var(--font);transition:background var(--transition)}.footer-subscribe-form button:hover{background:#0e7490}.footer-divider{border:none;border-top:1px solid rgba(255,255,255,.08);margin:0}.footer-bottom{padding:1.1rem 0;background:rgba(0,0,0,.2)}.footer-bottom-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.footer-bottom p{font-size:.78rem;color:rgba(255,255,255,.4);margin:0}.footer-bottom a{color:rgba(255,255,255,.5)}.footer-bottom a:hover{color:rgba(255,255,255,.8);text-decoration:none}.footer-bottom-links{display:flex;gap:1rem}.footer-bottom-links a{font-size:.78rem;color:rgba(255,255,255,.45)}.disclaimer-note{font-size:.72rem;margin-top:.25rem;display:block}@media (max-width:1024px){.content-sidebar-layout,.page-layout{grid-template-columns:1fr}.content-sidebar{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}.footer-grid{grid-template-columns:1fr 1fr;gap:2rem}.footer-col:last-child{grid-column:span 2}}@media (max-width:768px){.header-row{height:auto;padding:.6rem 0;flex-wrap:wrap;gap:.7rem}.header-search-wrap{order:3;flex:0 0 100%;max-width:100%}.main-nav{margin-left:auto}.nav-toggle{display:flex}#main-menu{display:none;flex-direction:column;gap:0;position:absolute;top:100%;left:0;right:0;background:var(--navy);border-top:1px solid rgba(255,255,255,.08);box-shadow:0 8px 20px rgba(0,0,0,.3);z-index:999}#main-menu.open{display:flex}#main-menu li{border-bottom:1px solid rgba(255,255,255,.06)}.nav-list a{padding:.75rem 1.25rem;border-radius:0;font-size:.9rem}.site-header{position:relative}.card-grid{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr;gap:1.5rem}.footer-col:last-child{grid-column:auto}.footer-banner-inner{flex-direction:column;align-items:flex-start}.footer-bottom-inner{flex-direction:column;align-items:flex-start}.chem-hero-banner{padding:1.5rem 1.25rem}.chem-hero-name{font-size:1.5rem}.page-body{padding:1.25rem}.chem-hero-banner::after{display:none}.hp-hero{padding:2rem 0 1.75rem}.hp-hero-title{font-size:1.6rem}.hp-search-form .hp-search-inner{flex-direction:column;border-radius:var(--radius)}.hp-search-form input{border-radius:var(--radius) var(--radius) 0 0 !important;border-right:1.5px solid var(--gray-200) !important;border-bottom:none}.hp-search-form button{border-radius:0 0 var(--radius) var(--radius) !important;padding:.75rem;justify-content:center}.hp-two-col{grid-template-columns:1fr}.hp-articles-layout{grid-template-columns:1fr}.hp-sidebar{display:none}.hp-alpha-row{gap:.25rem}}@media (max-width:480px){.card-grid{grid-template-columns:1fr}.alpha-grid{grid-template-columns:repeat(5,1fr)}.key-facts-grid{grid-template-columns:1fr 1fr}.related-cards-grid{grid-template-columns:1fr 1fr}.stats-box{flex-direction:column}.container{padding:0 1rem}}.cd-layout{display:grid;grid-template-columns:1fr 268px;gap:1.75rem;align-items:start;padding-top:0;padding-bottom:2.5rem}.cd-main{min-width:0}.cd-sidebar{display:flex;flex-direction:column;gap:1rem}.mono{font-family:var(--mono)}.cd-hero{background:linear-gradient(135deg,var(--navy) 0%,#1a3a6b 100%);color:var(--white);padding:1.25rem 0 1.5rem;position:relative;overflow:hidden}.cd-hero::after{content:attr(data-letter);position:absolute;right:0;top:-30px;font-size:11rem;font-weight:900;color:rgba(255,255,255,.04);line-height:1;pointer-events:none;letter-spacing:-.05em}.cd-breadcrumb{display:flex;align-items:center;gap:.4rem;font-size:.78rem;color:rgba(255,255,255,.5);margin-bottom:.85rem}.cd-breadcrumb a{color:rgba(255,255,255,.6);text-decoration:none}.cd-breadcrumb a:hover{color:var(--white)}.cd-breadcrumb span:not(:last-child){color:rgba(255,255,255,.3)}.cd-hero-body{display:flex;align-items:flex-start;gap:1.25rem;position:relative;z-index:1}.cd-letter-badge{width:60px;height:60px;flex-shrink:0;background:rgba(255,255,255,.12);border:2px solid rgba(255,255,255,.2);border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:900;color:var(--white)}.cd-hero-info{flex:1;min-width:0}.cd-title{font-size:clamp(1.4rem,3vw,2.1rem);font-weight:900;color:var(--white);margin:0 0 .3rem;letter-spacing:-.02em}.cd-iupac{font-size:.83rem;color:rgba(255,255,255,.65);margin:0 0 .65rem}.cd-badges{display:flex;gap:.4rem;flex-wrap:wrap}.cd-badge{display:inline-flex;align-items:center;padding:.25rem .7rem;border-radius:99px;font-size:.76rem;font-weight:600}.cd-badge-formula{background:rgba(255,255,255,.15);color:var(--white);font-family:var(--mono)}.cd-badge-cat{background:rgba(8,145,178,.3);color:rgba(255,255,255,.9);text-decoration:none;border:1px solid rgba(8,145,178,.4)}.cd-badge-cat:hover{background:rgba(8,145,178,.5);color:var(--white);text-decoration:none}.cd-badge-cas{background:rgba(0,0,0,.25);color:rgba(255,255,255,.8);font-family:var(--mono);font-size:.7rem}.cd-print-btn{flex-shrink:0;display:flex;align-items:center;gap:.4rem;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:rgba(255,255,255,.8);border-radius:var(--radius);padding:.4rem .85rem;font-size:.8rem;font-weight:600;cursor:pointer;font-family:var(--font);transition:all var(--transition)}.cd-print-btn:hover{background:rgba(255,255,255,.2);color:var(--white)}.cd-ref-card{border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;margin:1.25rem 0;box-shadow:var(--shadow-xs)}.cd-ref-title{background:var(--navy);color:var(--white);padding:.55rem 1rem;font-size:.75rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;display:flex;align-items:center;gap:.45rem}.cd-ref-table{width:100%;border-collapse:collapse}.cd-ref-table th{width:38%;text-align:left;padding:.5rem 1rem;background:#f5f8ff;font-size:.82rem;font-weight:600;color:var(--gray-700);border:1px solid #e5eaf6}.cd-ref-table td{padding:.5rem 1rem;border:1px solid #e5eaf6;font-size:.88rem}.cd-ref-table tr:nth-child(even) td{background:#fafbff}.cd-section{margin:0 0 1.75rem;padding-bottom:1.75rem;border-bottom:1px solid var(--gray-100)}.cd-section:last-of-type{border-bottom:none;margin-bottom:0}.cd-section h2{font-size:1.2rem;font-weight:800;color:var(--navy);margin:0 0 .85rem;padding:.5rem 1rem;background:linear-gradient(90deg,var(--blue-light),transparent);border-left:3px solid var(--blue);border-radius:0 var(--radius) var(--radius) 0;display:flex;align-items:center;gap:.5rem}.cd-safety-section h2{background:linear-gradient(90deg,#fff5f5,transparent);border-left-color:var(--red)}.cd-subhead{font-size:1rem;font-weight:700;color:var(--gray-900);margin:1.25rem 0 .65rem}.cd-body{line-height:1.8;color:var(--gray-700);font-size:.95rem}.cd-body p:last-child{margin-bottom:0}.cd-section-intro{font-size:.88rem;color:var(--gray-400);margin-bottom:1rem}.cd-formula-box{background:linear-gradient(135deg,#f0f6ff,#e8f2fb);border:2px dashed #c0d0ea;border-radius:var(--radius-lg);padding:1.25rem;text-align:center;margin:.75rem 0 1rem}.cd-formula-text{font-family:var(--mono);font-size:1.3rem;font-weight:700;color:var(--blue);line-height:1.6;word-break:break-all}.cd-data-table{width:100%;border-collapse:collapse;margin-top:.75rem;font-size:.9rem}.cd-data-table th{background:var(--gray-50);color:var(--gray-700);font-weight:600;padding:.5rem .9rem;text-align:left;border:1px solid var(--gray-200);font-size:.82rem}.cd-data-table td{padding:.5rem .9rem;border:1px solid var(--gray-200)}.cd-data-table tr:nth-child(even) td{background:#fafbff}.cd-safety-box{background:#fff8f0;border:1.5px solid #fbbf24;border-left:4px solid var(--red);border-radius:var(--radius);padding:1rem 1.25rem;margin-bottom:.5rem}.cd-safety-note{font-size:.78rem;color:var(--gray-400);font-style:italic}.cd-facts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:.75rem}.cd-fact{background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius);padding:.8rem 1rem;display:flex;flex-direction:column;gap:.2rem;box-shadow:var(--shadow-xs)}.cd-fact-label{font-size:.68rem;color:var(--gray-400);font-weight:700;text-transform:uppercase;letter-spacing:.07em}.cd-fact-value{font-size:.92rem;font-weight:700;color:var(--navy)}.cd-fact-value.mono{font-family:var(--mono);color:var(--blue)}.cd-fact-value a{color:var(--blue)}.cd-fact-wide{grid-column:span 2}@media (max-width:480px){.cd-fact-wide{grid-column:1}}.cd-related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.75rem}.cd-related-card{border:1.5px solid var(--gray-200);border-radius:var(--radius);padding:.85rem 1rem;display:flex;flex-direction:column;gap:.25rem;background:var(--white);text-decoration:none;transition:all var(--transition);box-shadow:var(--shadow-xs)}.cd-related-card:hover{border-color:var(--blue);background:var(--blue-light);text-decoration:none}.cd-rel-name{font-size:.88rem;font-weight:700;color:var(--navy)}.cd-rel-formula{font-family:var(--mono);font-size:.75rem;color:var(--blue)}.cd-rel-desc{font-size:.78rem;color:var(--gray-500);line-height:1.5}.cd-same-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(155px,1fr));gap:.5rem}.cd-same-item{display:flex;flex-direction:column;gap:.15rem;padding:.55rem .75rem;border:1px solid var(--gray-200);border-radius:var(--radius);background:var(--white);text-decoration:none;transition:all var(--transition)}.cd-same-item:hover{border-color:var(--blue);background:var(--blue-light);text-decoration:none}.cd-same-name{font-size:.83rem;font-weight:600;color:var(--navy)}.cd-same-formula{font-family:var(--mono);font-size:.72rem;color:var(--blue)}.cd-browse-all{display:inline-block;margin-top:.85rem;font-size:.85rem;color:var(--blue);font-weight:600}.cd-browse-all:hover{text-decoration:none;color:var(--navy-mid)}.cd-az-bar{display:flex;flex-wrap:wrap;gap:.25rem;padding:1.25rem 0 0;border-top:1px solid var(--gray-100)}.cd-az-item{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:5px;font-size:.77rem;font-weight:700;background:var(--gray-100);color:var(--gray-600);text-decoration:none;transition:all var(--transition)}.cd-az-item:hover{background:var(--blue);color:var(--white);text-decoration:none}.cd-az-item.cd-az-active{background:var(--blue);color:var(--white)}.cd-widget{background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xs)}.cd-widget-head{background:var(--gray-50);padding:.55rem 1rem;border-bottom:1px solid var(--gray-200);font-size:.72rem;font-weight:700;color:var(--navy);text-transform:uppercase;letter-spacing:.08em}.cd-widget-ad .cd-widget-head{background:var(--gray-50)}.cd-widget-ad{padding:.5rem}.cd-toc{list-style:none;padding:0;margin:0;counter-reset:toc}.cd-toc li{counter-increment:toc;border-bottom:1px solid var(--gray-100)}.cd-toc li:last-child{border-bottom:none}.cd-toc a{display:flex;align-items:center;gap:.5rem;padding:.45rem 1rem;font-size:.83rem;color:var(--gray-600);text-decoration:none;transition:all var(--transition)}.cd-toc a::before{content:counter(toc);min-width:18px;height:18px;background:var(--gray-100);color:var(--gray-500);border-radius:50%;font-size:.7rem;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.cd-toc a:hover{color:var(--blue);background:var(--blue-light)}.cd-toc a.toc-active{color:var(--blue);font-weight:600}.cd-toc a.toc-active::before{background:var(--blue);color:var(--white)}.cd-sidebar-list{list-style:none;padding:0;margin:0}.cd-sidebar-list li{border-bottom:1px solid var(--gray-100)}.cd-sidebar-list li:last-child{border-bottom:none}.cd-sidebar-list a{display:flex;align-items:center;justify-content:space-between;padding:.45rem 1rem;font-size:.83rem;color:var(--gray-700);text-decoration:none;transition:all var(--transition)}.cd-sidebar-list a:hover{color:var(--blue);background:var(--blue-light)}.cd-sl-formula{font-family:var(--mono);font-size:.72rem;color:var(--blue);background:var(--blue-light);padding:.1rem .35rem;border-radius:3px;flex-shrink:0}.cd-widget-more{display:block;padding:.5rem 1rem;font-size:.8rem;color:var(--blue);font-weight:600;border-top:1px solid var(--gray-100);text-decoration:none}.cd-widget-more:hover{background:var(--blue-light)}.cd-alpha-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:.2rem;padding:.65rem .75rem}.cd-alpha-grid a{display:flex;align-items:center;justify-content:center;height:28px;border-radius:4px;font-size:.76rem;font-weight:700;background:var(--gray-100);color:var(--gray-600);text-decoration:none;transition:all var(--transition)}.cd-alpha-grid a:hover,.cd-alpha-grid a.active{background:var(--blue);color:var(--white);text-decoration:none}@media (max-width:1024px){.cd-layout{grid-template-columns:1fr}.cd-sidebar{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}}@media (max-width:768px){.cd-hero{padding:1rem 0 1.25rem}.cd-title{font-size:1.4rem}.cd-letter-badge{width:48px;height:48px;font-size:1.6rem;border-radius:10px}.cd-facts-grid{grid-template-columns:1fr 1fr}.cd-related-grid{grid-template-columns:1fr 1fr}.cd-hero::after{display:none}.cd-sidebar{display:none}.cd-print-btn{display:none}}.hp-hero{background:var(--navy);padding:3rem 0 2.5rem;position:relative;overflow:hidden}.hp-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 70% 60% at 75% 50%,rgba(8,145,178,.18) 0%,transparent 65%);pointer-events:none}.hp-hero-inner{position:relative;z-index:1;max-width:680px}.hp-hero-kicker{display:inline-block;background:rgba(8,145,178,.25);border:1px solid rgba(8,145,178,.4);color:#7dd3fc;font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:.3rem .8rem;border-radius:99px;margin-bottom:.9rem}.hp-hero-title{color:var(--white);font-size:clamp(1.7rem,4vw,2.4rem);font-weight:800;letter-spacing:-.03em;line-height:1.15;margin-bottom:.6rem}.hp-hero-sub{color:rgba(255,255,255,.65);font-size:1rem;line-height:1.65;margin-bottom:1.75rem}.hp-search-form{position:relative;margin-bottom:1.1rem}.hp-search-inner{display:flex;border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 6px 30px rgba(0,0,0,.3)}.hp-search-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);color:var(--gray-400);pointer-events:none;z-index:1}.hp-search-form input{flex:1;padding:.9rem 1rem .9rem 2.8rem;font-size:1rem;border:1.5px solid var(--gray-200);border-right:none;border-radius:var(--radius-lg) 0 0 var(--radius-lg);background:var(--white);color:var(--gray-900);outline:none;font-family:var(--font);min-width:0}.hp-search-form input:focus{border-color:var(--blue)}.hp-search-form button{padding:.9rem 1.6rem;background:var(--teal);border:none;border-radius:0 var(--radius-lg) var(--radius-lg) 0;color:var(--white);font-weight:700;font-size:.95rem;cursor:pointer;font-family:var(--font);transition:background var(--transition);flex-shrink:0}.hp-search-form button:hover{background:#0e7490}.hp-suggestions{position:absolute;top:100%;left:0;right:0;z-index:600;margin-top:4px;border-radius:var(--radius)}.hp-hero-stats{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;font-size:.82rem;color:rgba(255,255,255,.5)}.hp-hero-stats strong{color:rgba(255,255,255,.9)}.stat-div{color:rgba(255,255,255,.2)}.hp-section{padding:1.75rem 0}.hp-section+.hp-section{padding-top:0}.hp-section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.hp-section-head h2{margin:0;font-size:1.1rem;font-weight:700;color:var(--navy)}.hp-see-all{font-size:.83rem;color:var(--blue);font-weight:600}.hp-see-all:hover{text-decoration:none;color:var(--navy-mid)}.hp-browse{background:var(--white);border-bottom:1px solid var(--gray-100)}.hp-browse .container{padding-top:1rem;padding-bottom:1rem}.hp-alpha-row{display:flex;flex-wrap:wrap;gap:.3rem}.hp-alpha-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:38px;padding:.4rem .3rem;border-radius:var(--radius);background:var(--white);border:1.5px solid var(--gray-200);text-decoration:none;transition:all var(--transition);gap:1px}.hp-alpha-btn:hover{border-color:var(--blue);background:var(--blue-light);text-decoration:none}.hp-alpha-empty{opacity:.3;pointer-events:none}.ha-letter{font-size:.9rem;font-weight:800;color:var(--navy);line-height:1}.ha-count{font-size:.62rem;color:var(--gray-400);line-height:1}.hp-two-col{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}.hp-col{background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xs)}.hp-col-head{display:flex;align-items:center;justify-content:space-between;padding:.85rem 1.1rem;border-bottom:1px solid var(--gray-100);background:var(--gray-50)}.hp-col-head h2{display:flex;align-items:center;gap:.45rem;margin:0;font-size:1rem;font-weight:700;color:var(--navy)}.hp-col-head h2 svg{color:var(--blue);flex-shrink:0}.hp-col-head a{font-size:.8rem;color:var(--blue);font-weight:600}.hp-col-head a:hover{text-decoration:none;color:var(--navy-mid)}.hp-chem-list{display:flex;flex-direction:column}.hp-chem-item{display:flex;align-items:center;gap:.75rem;padding:.65rem 1.1rem;border-bottom:1px solid var(--gray-100);text-decoration:none;transition:background var(--transition)}.hp-chem-item:last-child{border-bottom:none}.hp-chem-item:hover{background:var(--blue-light)}.hp-chem-badge{width:30px;height:30px;background:var(--navy);color:var(--white);border-radius:7px;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:800;flex-shrink:0}.hp-chem-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}.hp-chem-name{font-size:.9rem;font-weight:600;color:var(--navy);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.hp-chem-formula{font-family:var(--mono);font-size:.75rem;color:var(--blue)}.hp-chem-arrow{color:var(--gray-300);flex-shrink:0}.hp-chem-item:hover .hp-chem-arrow{color:var(--blue)}.hp-cat-list{display:flex;flex-direction:column}.hp-cat-item{display:flex;align-items:center;gap:.5rem;padding:.65rem 1.1rem;border-bottom:1px solid var(--gray-100);text-decoration:none;transition:background var(--transition)}.hp-cat-item:last-child{border-bottom:none}.hp-cat-item:hover{background:var(--blue-light)}.hp-cat-name{font-size:.9rem;font-weight:600;color:var(--navy);flex:1}.hp-cat-desc{font-size:.77rem;color:var(--gray-400);flex:2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:none}@media (min-width:900px){.hp-cat-desc{display:block}}.hp-articles-layout{display:grid;grid-template-columns:1fr 280px;gap:1.5rem;align-items:start}.hp-articles-main{background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xs)}.hp-article-list{display:flex;flex-direction:column}.hp-article-item{display:block;padding:1rem 1.1rem;border-bottom:1px solid var(--gray-100);text-decoration:none;transition:background var(--transition)}.hp-article-item:last-child{border-bottom:none}.hp-article-item:hover{background:var(--gray-50)}.hp-art-meta{display:flex;align-items:center;gap:.6rem;margin-bottom:.35rem}.hp-art-cat{background:var(--teal-light);color:var(--teal);font-size:.72rem;font-weight:700;padding:.15rem .55rem;border-radius:99px;text-transform:uppercase;letter-spacing:.04em}.hp-art-date{color:var(--gray-400);font-size:.75rem}.hp-art-title{font-size:.93rem;font-weight:700;color:var(--navy);margin-bottom:.3rem;line-height:1.35}.hp-art-excerpt{font-size:.82rem;color:var(--gray-500);line-height:1.5;margin:0}.hp-sidebar{display:flex;flex-direction:column;gap:1rem}.hp-widget{background:var(--white);border:1.5px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-xs)}.hp-widget-head{background:var(--gray-50);padding:.6rem 1rem;border-bottom:1px solid var(--gray-200);font-size:.75rem;font-weight:700;color:var(--navy);text-transform:uppercase;letter-spacing:.07em}.hp-widget-body{padding:.5rem 0}.hp-qr-link{display:flex;align-items:center;gap:.6rem;padding:.5rem 1rem;font-size:.85rem;color:var(--gray-700);text-decoration:none;transition:background var(--transition);border-bottom:1px solid var(--gray-100)}.hp-qr-link:last-child{border-bottom:none}.hp-qr-link:hover{background:var(--blue-light);color:var(--blue);text-decoration:none}.hp-qr-icon{font-size:1rem;width:20px;text-align:center}.hp-widget-ad .hp-widget-body{padding:.75rem}.hp-stats-list{padding:.5rem .75rem;display:flex;flex-direction:column;gap:.5rem}.hp-stat-row{display:flex;align-items:center;gap:.6rem}.hp-stat-letter{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;background:var(--navy);color:var(--white);border-radius:5px;font-size:.73rem;font-weight:800;flex-shrink:0;text-decoration:none}.hp-stat-letter:hover{background:var(--blue);text-decoration:none}.hp-stat-bar-wrap{flex:1;background:var(--gray-100);border-radius:99px;height:6px;overflow:hidden}.hp-stat-bar{height:100%;background:linear-gradient(90deg,var(--blue),var(--teal));border-radius:99px}.hp-stat-num{font-size:.75rem;color:var(--gray-500);font-weight:600;min-width:24px;text-align:right}.hp-features{background:var(--white);border-top:1px solid var(--gray-100)}.hp-features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}.hp-feature{display:flex;flex-direction:column;gap:.5rem;padding:1.25rem 0}.hp-feature-icon{width:40px;height:40px;background:var(--blue-light);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:var(--blue);margin-bottom:.3rem}.hp-feature h3{font-size:.95rem;margin:0 0 .2rem;color:var(--navy)}.hp-feature p{font-size:.83rem;color:var(--gray-500);margin:0;line-height:1.55}@media (max-width:900px){.hp-features-grid{grid-template-columns:1fr 1fr}}@media (max-width:480px){.hp-features-grid{grid-template-columns:1fr 1fr;gap:1rem}.hp-two-col{grid-template-columns:1fr}.hp-alpha-btn{min-width:32px;padding:.35rem .2rem}.ha-letter{font-size:.82rem}}@media print{*{color:#000 !important;background:#fff !important;box-shadow:none !important}.no-print,.site-header,.content-sidebar,.ad-wrapper,.share-section,.print-bar,.btn-print,.hero-search,.top-bar,.site-footer,.related-chemicals,.same-letter-section,.az-section{display:none !important}.print-only{display:block !important}.content-sidebar-layout{display:block !important}.main-content{padding:0 !important}.faq-answer[hidden]{display:block !important}.chem-hero-banner{background:#f0f4f8 !important;color:#000 !important;padding:1rem !important;border:1px solid #ccc !important}.chem-hero-name{color:#000 !important;font-size:1.4rem !important}.badge{border:1px solid #999 !important;color:#000 !important}h1,h2,h3{page-break-after:avoid}.chem-section{page-break-inside:avoid;border-bottom:1px solid #ddd !important}a[href]::after{content:" (" attr(href) ")";font-size:.75em;color:#555 !important}.print-header,.print-footer{display:block !important}.print-header{border-bottom:2px solid #000;margin-bottom:1rem;padding-bottom:.5rem}.print-footer{border-top:1px solid #ccc;margin-top:1rem;font-size:.8rem;color:#555 !important}.page-body{padding:0 !important}}