:root{color-scheme:light;--ink: #17212b;--muted: #5c6670;--paper: #f7f9fc;--surface: #ffffff;--wash: #f4f8f6;--line: #dfe7e2;--teal: #0f766e;--teal-dark: #0a514d;--gold: #f4b740;--coral: #e85d5a;--tool-width: 960px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);line-height:1.6}a{color:inherit;text-decoration:none}.site-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:18px clamp(18px,5vw,72px);border-bottom:1px solid var(--line);background:#fffffff0;position:sticky;top:0;z-index:10;backdrop-filter:blur(14px)}.brand{display:inline-flex;align-items:center;flex:0 0 auto;min-width:0}.brand img{display:block;width:clamp(190px,20vw,260px);height:auto}.main-nav,.site-footer nav{display:flex;align-items:center;flex-wrap:wrap;gap:14px}.main-nav{min-width:0;justify-content:flex-end}.menu-toggle{display:none;align-items:center;justify-content:center;width:42px;min-height:40px;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);font:inherit;font-size:.92rem;font-weight:850;cursor:pointer}.menu-toggle i,.menu-toggle i:before,.menu-toggle i:after{display:block;width:18px;height:2px;border-radius:999px;background:var(--teal-dark)}.menu-toggle i{position:relative}.menu-toggle i:before,.menu-toggle i:after{position:absolute;left:0;content:""}.menu-toggle i:before{top:-6px}.menu-toggle i:after{top:6px}.menu-toggle[aria-expanded=true] i{background:transparent}.menu-toggle[aria-expanded=true] i:before{top:0;transform:rotate(45deg)}.menu-toggle[aria-expanded=true] i:after{top:0;transform:rotate(-45deg)}.main-nav a,.site-footer a{color:var(--muted);font-weight:700;font-size:.93rem}.main-nav a:hover,.site-footer a:hover{color:var(--teal-dark)}main{min-height:72vh}.home-hero{display:block;padding:clamp(48px,7vw,86px) clamp(18px,5vw,72px);background:var(--wash);border-bottom:1px solid var(--line);text-align:center}.home-hero-copy{max-width:820px;margin:0 auto}.home-hero-copy h1{margin:0;line-height:1.1;font-size:clamp(2.05rem,4vw,3.25rem);letter-spacing:0}.home-hero-copy p,.content-page p{color:var(--muted);max-width:68ch}.content-page a{color:var(--teal-dark);font-weight:800;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.home-hero-copy p{margin:18px auto 0;color:#475569;font-size:clamp(1.05rem,2vw,1.18rem)}.home-hero-actions{justify-content:center;display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.home-hero-actions a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 15px;border:1px solid var(--teal);border-radius:8px;color:var(--teal-dark);font-weight:850}.home-hero-actions a:first-child{background:var(--teal);color:#fff}.home-hero-actions a:hover{box-shadow:0 8px 22px #0f172a1a;transform:translateY(-1px)}.eyebrow{margin:0 0 12px;color:var(--coral);font-size:.82rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.home-category-section{width:min(1180px,calc(100% - 36px));margin:0 auto;padding:34px 0 10px}.home-section-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-end;margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--line)}.home-section-head h2{margin:0;color:var(--ink);font-size:clamp(1.45rem,2.6vw,1.85rem);line-height:1.2}.home-section-head p{margin:7px 0 0;color:var(--muted)}.home-section-head a{flex:0 0 auto;color:var(--teal-dark);font-weight:800}.home-section-head a:hover{text-decoration:underline}.home-category-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.home-category-grid a{display:grid;gap:7px;min-height:150px;padding:18px;border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:0 1px 2px #0f172a09}.home-category-grid a:hover{border-color:#c8e6c9;box-shadow:0 10px 24px #0f172a14;transform:translateY(-1px)}.home-category-grid span{width:fit-content;color:var(--teal-dark);font-size:.82rem;font-weight:900;text-transform:uppercase}.home-category-grid strong{max-width:32ch;color:var(--ink);font-size:clamp(1.2rem,2.2vw,1.45rem);line-height:1.25}.home-category-grid small{color:var(--muted);font-size:.95rem;font-weight:700}.home-tools-section{width:min(1180px,calc(100% - 36px));margin:0 auto;padding:34px 0 18px}.home-tools-section-alt{padding-top:28px}.home-tool-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.home-tool-card{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px 14px;align-items:center;padding:16px;border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:0 1px 2px #0f172a09;transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease}.home-tool-card:hover{border-color:#c8e6c9;box-shadow:0 10px 24px #0f172a14;transform:translateY(-1px)}.home-tool-card span{grid-column:1 / -1;width:fit-content;padding:3px 8px;border:1px solid #dcebe2;border-radius:999px;background:#f4fbf5;color:var(--teal-dark);font-size:.76rem;font-weight:900;line-height:1.2}.home-tool-card strong{color:var(--ink);font-size:1.02rem;line-height:1.3}.home-tool-card small{display:inline-flex;align-items:center;justify-self:end;overflow:hidden;border:1px solid #d6e8dd;border-radius:8px;color:var(--teal-dark);font-size:.82rem;font-weight:800;line-height:1;white-space:nowrap}.home-tool-card small b{padding:7px 8px}.home-tool-card small b:first-child{border-right:1px solid #d6e8dd;background:#f4fbf5;color:#526170}.home-note-section{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,360px);gap:24px;align-items:center;width:min(1180px,calc(100% - 36px));margin:20px auto 72px;padding:22px;border:1px solid var(--line);border-radius:8px;background:#fff}.home-note-section h2{margin:0;font-size:clamp(1.25rem,2.3vw,1.55rem);line-height:1.25}.home-note-section p{max-width:66ch;margin:8px 0 0;color:var(--muted)}.home-note-links{display:grid;gap:8px}.home-note-links a{padding:10px 12px;border:1px solid #dbe7dd;border-radius:8px;background:#f8fafc;color:var(--teal-dark);font-weight:850}.home-note-links a:hover{background:#eef7ef}.tool-header{width:min(var(--tool-width),calc(100% - 36px));max-width:var(--tool-width);margin:0 auto;padding:30px 0 10px}.tool-header h1{margin:0;color:var(--ink);font-size:clamp(1.75rem,3vw,2rem);line-height:1.22;letter-spacing:0}.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:14px;padding:9px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);font-size:.9rem;line-height:1.35}.breadcrumbs a{color:var(--teal-dark);font-weight:700}.breadcrumbs a:hover{text-decoration:underline}.breadcrumbs span[aria-hidden=true]{color:#9aa7b3}.breadcrumbs span:last-child{color:#64748b}.tool-summary{max-width:none;margin:30px 0 0;color:#334155;font-size:1rem}.tool-section{padding:22px 18px 20px}.tool-hero{width:min(1180px,calc(100% - 36px));margin:0 auto;padding:34px 0 18px}.tool-hero-copy{max-width:940px}.tool-hero-copy h1{margin:0;color:var(--ink);font-size:clamp(2rem,4vw,2.8rem);line-height:1.08;letter-spacing:0}.tool-hero-copy p:not(.eyebrow){max-width:74ch;margin:14px 0 0;color:#475569;font-size:1.04rem}.listing-section{padding:12px 0 72px}.listing-inner{display:grid;gap:38px;width:min(1180px,calc(100% - 36px));margin:0 auto}.tool-category{display:grid;gap:18px}.tool-category-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start;padding:0 0 12px;border-bottom:1px solid var(--line)}.tool-category-head h2{margin:0;color:var(--ink);font-size:clamp(1.45rem,2.6vw,1.85rem);line-height:1.2}.tool-category-head p{max-width:68ch;margin:7px 0 0;color:var(--muted);font-size:.96rem}.tool-category-head>span{flex:0 0 auto;margin-top:7px;padding:5px 10px;border:1px solid #dcebe2;border-radius:999px;background:var(--surface);color:var(--teal-dark);font-size:.82rem;font-weight:900}.tool-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.tool-list-card{display:grid;grid-template-rows:auto auto 1fr auto;gap:9px;min-height:198px;padding:18px;border:1px solid var(--line);border-radius:8px;background:#fff;box-shadow:0 1px 2px #0f172a09;transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease}.tool-list-card span{width:fit-content;padding:3px 8px;border:1px solid #dcebe2;border-radius:999px;background:#f4fbf5;color:var(--teal-dark);font-size:.78rem;font-weight:900;line-height:1.2}.tool-list-card strong{color:var(--ink);font-size:1.12rem;line-height:1.25}.tool-list-card p{margin:0;color:var(--muted);font-size:.95rem;line-height:1.5}.tool-list-card small{display:inline-flex;align-items:center;gap:0;justify-self:start;overflow:hidden;border:1px solid #d6e8dd;border-radius:8px;color:var(--teal-dark);font-size:.88rem;font-weight:800;line-height:1}.tool-list-card small b{padding:8px 10px}.tool-list-card small b:first-child{border-right:1px solid #d6e8dd;background:#f4fbf5;color:#526170;font-weight:800}.tool-list-card small b:last-child{background:#fff}.tool-list-card:hover{border-color:#c8e6c9;box-shadow:0 10px 26px #0f172a14;transform:translateY(-1px)}.article-content{color:#334155;font-size:1.02rem}.article-content p{max-width:none;margin:0 0 16px}.article-content p a{color:var(--teal-dark);font-weight:700;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.article-content p a:hover{color:var(--teal)}.article-content h2{margin:34px 0 10px;color:var(--ink);font-size:clamp(1.35rem,2.4vw,1.55rem);line-height:1.25}.article-content h3{margin:22px 0 8px;color:var(--ink);font-size:1.15rem;line-height:1.3}.article-content h4{margin:18px 0 6px;color:var(--ink);font-size:1.03rem;line-height:1.35}.article-content h3+p{padding-bottom:18px;border-bottom:1px solid var(--line)}.quick-reference{margin:18px 0 24px;padding:20px;border:1px solid #cfe0d7;border-radius:8px;background:linear-gradient(135deg,#fff,#f4fbf7);box-shadow:0 1px 2px #0f172a0a}.quick-reference-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.quick-reference-grid div{min-height:92px;padding:13px 12px;border:1px solid #dcebe2;border-radius:8px;background:#fff}.quick-reference-grid span{display:block;color:#526170;font-size:.9rem;font-weight:800}.quick-reference-grid strong{display:block;margin-top:10px;color:var(--teal-dark);font-size:1.45rem;line-height:1}.formula-box{margin:16px 0;padding:14px 16px;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:8px;background:var(--surface)}.formula-box strong{display:block;margin-bottom:4px;color:var(--ink)}.formula-box code{color:var(--teal-dark);font:inherit;font-weight:800}.conversion-table-wrap{width:100%;margin:18px 0 34px;overflow-x:auto;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.conversion-table{width:100%;min-width:620px;border-collapse:collapse;background:#fff}.conversion-table th,.conversion-table td{border-bottom:1px solid var(--line);padding:11px 13px;text-align:left}.conversion-table th{background:#f4f8f6;color:var(--ink);font-weight:800}.conversion-table td+td,.conversion-table th+th{border-left:1px solid var(--line)}.conversion-table tr:nth-child(2n) td{background:#fbfdfb}.related-tool-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:16px 0 0}.related-tool-grid a{display:flex;align-items:center;padding:13px 14px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.related-tool-grid a:hover{border-color:#c8e6c9;background:#f4fbf5}.related-tool-grid span{color:var(--ink);font-weight:800}.cu101-converter-card{width:min(var(--tool-width),100%);max-width:var(--tool-width);margin:0 auto;padding:22px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font-family:inherit;box-shadow:0 1px 2px #0f172a0a}.cu101-converter-card *{box-sizing:border-box}.screen-calculator-card{width:min(var(--tool-width),100%);max-width:var(--tool-width);margin:0 auto;padding:22px;border:1px solid var(--line);border-radius:8px;background:#fff;box-shadow:0 1px 2px #0f172a0a}.screen-calculator-header{margin-bottom:16px}.screen-calculator-header h2{margin:0 0 8px;color:var(--ink);font-size:clamp(1.35rem,2.4vw,1.6rem);line-height:1.25}.screen-calculator-header p{margin:0;color:#475569;font-size:.98rem}.screen-calc-controls{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:14px}.screen-calc-controls label{display:grid;gap:8px;color:#334155;font-size:.9rem;font-weight:800}.screen-input-wrap{display:flex;align-items:center;overflow:hidden;border:1px solid #cbd5e1;border-radius:8px;background:#f8fafc}.screen-input-wrap input{width:100%;min-width:0;border:0;background:transparent;padding:13px;color:var(--ink);font:inherit;font-size:1.2rem;font-weight:850;outline:none}.screen-input-wrap span{padding:0 13px;border-left:1px solid #cbd5e1;color:#64748b;font-weight:800}.screen-calc-controls select{min-height:52px;border:1px solid #cbd5e1;border-radius:8px;background:#f8fafc;color:var(--ink);font:inherit;font-weight:800;padding:0 12px}.screen-result-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.screen-result-grid div{min-height:112px;padding:14px;border:1px solid #dcebe2;border-radius:8px;background:#f4fbf7}.screen-result-grid span,.screen-result-grid small{display:block;color:#526170;font-size:.88rem;font-weight:800}.screen-result-grid strong{display:block;margin:9px 0 6px;color:var(--teal-dark);font-size:1.35rem;line-height:1.05}.screen-quick-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:14px}.screen-quick-row span{color:#475569;font-size:.9rem;font-weight:800}.screen-quick-row button{border:1px solid #c8e6c9;border-radius:999px;background:#fff;color:var(--teal-dark);cursor:pointer;font-weight:850;padding:7px 11px}.screen-quick-row button:hover{background:#eef7ef}.cu101-converter-header{max-width:680px;margin:0 0 16px;text-align:left}.cu101-converter-header h2{margin:0 0 10px;color:#14213d;font-size:clamp(1.35rem,2.4vw,1.6rem);line-height:1.25;letter-spacing:0}.cu101-converter-header p{margin:0;color:#475569;font-size:16px;line-height:1.6}.cu101-tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:16px;padding:6px;border-radius:8px;background:#f1f5f4}.cu101-tab{border:0;border-radius:8px;padding:12px 10px;background:transparent;color:#2f4f34;font:inherit;font-size:15px;font-weight:700;cursor:pointer;transition:background .2s ease,color .2s ease,box-shadow .2s ease}.cu101-tab.active{background:#2e7d32;color:#fff}.cu101-converter-grid{display:grid;grid-template-columns:minmax(0,1fr) 46px minmax(0,1fr);gap:18px;align-items:center}.cu101-input-box,.cu101-result-box{min-height:120px;padding:16px;border:1px solid #dbe7dd;border-radius:8px;background:var(--surface)}.cu101-input-box label,.cu101-result-label{display:block;margin-bottom:8px;color:#334155;font-size:14px;font-weight:700}.cu101-input-wrap{display:flex;align-items:center;overflow:hidden;margin-top:8px;border:1px solid #cbd5e1;border-radius:8px;background:#f8fafc}.cu101-input-wrap input{width:100%;min-width:0;border:0;background:transparent;padding:15px;color:#111827;font:inherit;font-size:22px;font-weight:700;outline:none}.cu101-input-wrap span{padding:0 14px;border-left:1px solid #cbd5e1;color:#64748b;font-weight:700;white-space:nowrap}.cu101-result-box{border-color:#d9eadc;background:#f5fbf6}.cu101-result-main{color:#1b5e20;font-size:28px;line-height:1.2;font-weight:800;overflow-wrap:anywhere}.cu101-result-sub{margin-top:6px;color:#3f6b43;font-size:14px;line-height:1.5}.cu101-swap-btn{justify-self:center;width:46px;height:46px;border:1px solid #c8e6c9;border-radius:50%;background:#fff;color:#2e7d32;font-size:22px;font-weight:700;cursor:pointer;transition:background .2s ease,transform .2s ease}.cu101-swap-btn:hover{background:#e8f5e9;transform:scale(1.05)}.cu101-action-row{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:16px}.cu101-presets{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.cu101-presets span{color:#475569;font-size:14px;font-weight:700}.cu101-presets button,.cu101-copy-btn{border:1px solid #c8e6c9;border-radius:999px;background:#fff;color:#2e7d32;padding:8px 12px;font:inherit;font-weight:700;cursor:pointer;transition:background .2s ease,color .2s ease}.cu101-presets button:hover,.cu101-copy-btn:hover{background:#e8f5e9}.cu101-copy-btn{border-color:#2e7d32;background:#2e7d32;color:#fff}.cu101-copy-btn:hover{background:#256628;color:#fff}.cu101-note{margin:16px 0 0;padding:12px 14px;border-left:4px solid #2e7d32;background:#f4fbf5;color:#475569;font-size:14px;line-height:1.6}.lab-converter-card{width:min(var(--tool-width),100%);max-width:var(--tool-width);margin:0 auto;padding:22px;border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:0 1px 2px #0f172a0a}.lab-converter-header{max-width:720px;margin-bottom:16px}.lab-converter-header h2{margin:0 0 10px;color:#14213d;font-size:clamp(1.35rem,2.4vw,1.6rem);line-height:1.25;letter-spacing:0}.lab-converter-header p{margin:0;color:#475569;font-size:16px}.lab-molecule-panel{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;align-items:stretch;margin-bottom:12px;padding:14px;border:1px solid #dbe7dd;border-radius:8px;background:#f8fafc}.lab-select-label{display:grid;gap:8px;color:#334155;font-size:14px;font-weight:800}.lab-select-label span{color:var(--ink)}.lab-select-label select{width:100%;min-height:48px;border:1px solid #cbd5e1;border-radius:8px;background:#fff;color:var(--ink);font:inherit;font-weight:750;padding:10px 40px 10px 12px;cursor:pointer}.lab-select-label select:focus{border-color:var(--teal);box-shadow:0 0 0 3px #0f766e1f;outline:none}.lab-molecule-summary{display:grid;gap:3px;align-content:center;padding:12px 14px;border:1px solid #d9eadc;border-radius:8px;background:#f4fbf5}.lab-molecule-summary>span{color:#475569;font-size:.86rem;font-weight:800}.lab-molecule-summary strong{color:var(--teal-dark);font-size:clamp(1.05rem,2vw,1.25rem);line-height:1.25}.lab-molecule-summary small{color:var(--muted);font-size:.88rem;line-height:1.4}.lab-formula-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}.lab-formula-strip div{display:grid;gap:3px;padding:11px 13px;border:1px solid #dbe7dd;border-radius:8px;background:#fff}.lab-formula-strip span{color:#64748b;font-size:.8rem;font-weight:850;text-transform:uppercase}.lab-formula-strip strong{color:#14213d;font-size:.95rem;line-height:1.35;overflow-wrap:anywhere}.lab-converter-grid{display:grid;grid-template-columns:minmax(0,1fr) 46px minmax(0,1fr);gap:18px;align-items:center}.lab-reference .quick-reference-grid strong{font-size:clamp(1.35rem,2.6vw,1.7rem)}.lab-safety-note{margin:16px 0 0;padding:12px 14px;border:1px solid #dbe7dd;border-left:4px solid var(--teal);border-radius:8px;background:#f8fafc;color:#475569;font-size:14px;line-height:1.6}.lab-safety-note strong{color:var(--ink)}.page-band{padding:clamp(34px,7vw,72px) clamp(18px,5vw,72px);background:var(--wash)}.content-page{max-width:860px;margin:0 auto}.content-page.tool-content{width:min(var(--tool-width),calc(100% - 36px));max-width:var(--tool-width);padding:18px 0 64px}.content-page h1{font-size:clamp(1.75rem,3vw,2rem);line-height:1.22}.content-page h2{margin-top:34px;font-size:clamp(1.35rem,2.4vw,1.55rem);line-height:1.25}.site-footer{border-top:1px solid var(--line);background:#121d27;color:#fff}.footer-inner{display:grid;grid-template-columns:minmax(300px,.85fr) minmax(620px,1.4fr);gap:clamp(44px,6vw,78px);align-items:start;width:min(1180px,calc(100% - 36px));margin:0 auto;padding:50px 0 34px}.footer-brand{display:grid;gap:15px;align-content:start}.footer-brand img{display:block;width:min(280px,100%);height:auto;padding:8px 10px;border-radius:8px;background:#fff}.footer-brand p{max-width:42ch;margin:0;color:#cbd5dd;font-size:.98rem}.footer-brand a:not(:first-child){color:#dff7ef;font-weight:800}.site-footer .footer-links{display:grid;grid-template-columns:minmax(220px,1.2fr) minmax(120px,.75fr) minmax(170px,.9fr);gap:clamp(28px,4vw,44px);align-items:start;justify-self:stretch;width:100%}.footer-links div{display:grid;gap:11px;align-content:start;justify-items:start}.footer-links strong{display:block;width:100%;margin-bottom:4px;padding-bottom:10px;border-bottom:1px solid rgba(255,255,255,.14);color:#fff;font-size:1rem;line-height:1.2}.footer-links a{display:inline-block;color:#cbd5dd;font-size:.94rem;font-weight:700;line-height:1.35}.footer-links a:hover,.footer-brand a:hover{color:#fff}.footer-links a:hover{text-decoration:underline;text-underline-offset:4px}.footer-bottom{display:flex;justify-content:space-between;gap:16px;width:min(1180px,calc(100% - 36px));margin:0 auto;padding:17px 0 23px;border-top:1px solid rgba(255,255,255,.12);color:#9fb0be;font-size:.88rem}@media(max-width:820px){.home-hero,.home-category-grid,.home-note-section{grid-template-columns:1fr}.tool-category-head{align-items:flex-start;flex-direction:column;gap:8px}.home-section-head{align-items:flex-start;flex-direction:column;gap:10px}.home-tool-list{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-category-head>span{margin-top:0}.tool-list{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-inner{grid-template-columns:1fr;gap:30px}.site-footer .footer-links{grid-template-columns:repeat(3,minmax(0,1fr));justify-self:stretch;width:100%}.quick-reference-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:720px){.site-header{display:grid;grid-template-columns:1fr auto;gap:12px 14px;align-items:center;padding:14px 18px}.brand img{width:min(230px,78vw)}.menu-toggle{display:inline-flex;justify-self:end}.main-nav{grid-column:1 / -1;display:none;flex-direction:column;align-items:stretch;flex-wrap:nowrap;gap:8px;justify-content:flex-start;width:100%;padding:10px;border:1px solid var(--line);border-radius:8px;background:#fff;box-shadow:0 12px 30px #0f172a14}.main-nav a{display:block;padding:10px 11px;border:1px solid var(--line);border-radius:8px;background:#f8fafc;font-size:.88rem}.menu-open .main-nav{display:flex}.site-footer .footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-bottom{flex-direction:column}}@media(max-width:560px){.site-footer .footer-links{grid-template-columns:1fr}}@media(max-width:680px){.home-hero{padding-top:34px}.home-hero-copy h1{font-size:2rem}.home-hero-actions a{flex:1 1 150px}.home-category-grid a{min-height:auto}.tool-hero{padding-top:30px}.tool-hero-copy h1{font-size:2rem}.listing-inner{gap:28px}.tool-list-card{min-height:auto}.home-tool-list,.home-tool-card{grid-template-columns:1fr}.home-tool-card small{justify-self:start}.tool-list{grid-template-columns:1fr}.tool-header{padding-top:26px}.tool-header h1{font-size:1.65rem}.tool-summary{font-size:.98rem}.cu101-converter-card,.lab-converter-card,.screen-calculator-card{padding:18px}.screen-calc-controls,.screen-result-grid{grid-template-columns:1fr}.screen-result-grid div{min-height:auto}.lab-converter-header h2{font-size:21px}.lab-molecule-panel{grid-template-columns:1fr;padding:12px}.lab-formula-strip{grid-template-columns:1fr}.lab-converter-grid{grid-template-columns:1fr;gap:10px}.cu101-converter-header h2{font-size:21px}.cu101-converter-header{margin-bottom:14px}.cu101-converter-header p{font-size:15px}.cu101-tabs{grid-template-columns:1fr;gap:6px;margin-bottom:14px}.cu101-tab{padding:10px}.cu101-converter-grid{grid-template-columns:1fr;gap:10px}.cu101-input-box,.cu101-result-box{min-height:auto;padding:14px}.cu101-swap-btn{display:none}.cu101-swap-btn:hover{transform:none}.cu101-result-main{font-size:24px}.cu101-action-row{justify-content:center;gap:10px}.cu101-presets{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:5px;justify-content:center;width:100%;font-size:13px}.cu101-presets span{grid-column:1 / -1;font-size:13px;white-space:nowrap}.cu101-presets button{padding:6px 5px;font-size:12px;line-height:1.15;white-space:nowrap;text-align:center}.cu101-copy-btn{width:100%;text-align:center}.quick-reference{padding:16px}.quick-reference-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.quick-reference-grid div{min-height:82px}.quick-reference-grid strong{font-size:1.28rem}.related-tool-grid{grid-template-columns:1fr}}@media(max-width:520px){.brand{max-width:78vw}.site-header{gap:14px}.main-nav{gap:12px}.breadcrumbs{display:block}.breadcrumbs a,.breadcrumbs span{display:inline}.breadcrumbs span:last-child{display:block;margin-top:4px}.cu101-converter-card{padding:18px}.cu101-input-wrap input{font-size:20px}}