:root{--ink:#02351c;--muted:#48705b;--paper:#e7f1eb;--card:#f7fbf8;--line:#b9d3c3;--green:#046a38;--mint:#c9e1d2;--red:#046a38;--shadow:0 20px 55px rgba(4,106,56,.15)}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.5 Inter,ui-sans-serif,system-ui,-apple-system,sans-serif}
body.dark{--ink:#eef8f2;--muted:#a0c8b2;--paper:#012b17;--card:#043d22;--line:#17633d;--green:#55c98a;--mint:#0a5631;--red:#55c98a;--shadow:0 20px 55px #0006}
button,input,select{font:inherit}
button{cursor:pointer}
header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100% - 1180px)/2));border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;letter-spacing:.08em}
.brand small{display:block;color:var(--muted);font-size:9px}
.brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--red);color:white;font-weight:900}
.icon,.soft{border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:12px;padding:9px 13px}
.hero{max-width:1180px;margin:auto;padding:64px 24px 34px;background:linear-gradient(135deg,transparent 55%,color-mix(in srgb,var(--mint) 35%,transparent))}
.hero h1{font:700 clamp(38px,7vw,76px)/.98 Georgia,serif;max-width:720px;margin:9px 0 18px;letter-spacing:-.04em}
.hero>p:not(.eyebrow){max-width:650px;color:var(--muted);font-size:17px}
.eyebrow{margin:0;color:var(--red);font-size:11px;font-weight:800;letter-spacing:.16em}
.search{max-width:720px;background:var(--card);border:1px solid var(--line);border-radius:16px;display:flex;align-items:center;gap:12px;padding:0 18px;margin-top:28px;box-shadow:var(--shadow)}
.search span{font-size:27px}
.search input{width:100%;border:0;outline:0;background:none;color:var(--ink);padding:17px 0;font-size:16px}
nav{position:sticky;top:0;z-index:4;display:flex;gap:4px;max-width:1180px;margin:auto;padding:10px 24px;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(12px)}
nav button{border:0;border-radius:99px;background:transparent;color:var(--muted);padding:10px 18px;font-weight:700}
nav button.active{background:var(--green);color:var(--paper)}
main{min-height:80vh}
.panel{display:none;max-width:1180px;margin:auto;padding:28px 24px 70px}
.panel.active{display:block}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:15px;margin-bottom:20px}
.section-head h2{margin:4px 0;font:700 30px Georgia,serif}
.chips,.tool-grid{display:flex;gap:9px;overflow:auto;padding:3px 1px 14px;scrollbar-width:none}
.chips button,.tool-grid button{white-space:nowrap;border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:11px;padding:11px 15px;font-weight:650}
.chips button.active,.tool-grid button.active{border-color:var(--red);box-shadow:inset 0 -3px var(--red)}
.card{background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px}
.converter{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:26px;position:relative}
.converter label{font-size:10px;letter-spacing:.12em;font-weight:800;color:var(--muted)}
.converter input,.converter output{display:block;width:100%;border:0;background:none;color:var(--ink);font:700 clamp(32px,6vw,62px)/1.2 Georgia,serif;padding:8px 0;overflow:hidden}
.converter output{color:var(--red)}
select{width:100%;background:var(--paper);color:var(--ink);border:1px solid var(--line);border-radius:12px;padding:13px}
.swap{position:absolute;left:50%;top:50%;translate:-50% -25%;width:43px;height:43px;border:0;border-radius:50%;background:var(--green);color:var(--paper);font-size:22px}
.actions{grid-column:1/-1;display:flex;gap:10px}
.actions button{border:0;border-radius:10px;background:var(--mint);color:var(--ink);padding:11px 15px;font-weight:700}
.formula{grid-column:1/-1;margin:0;border-top:1px solid var(--line);padding-top:14px;color:var(--muted)}
.notice{margin-top:18px;padding:18px;border-left:3px solid var(--red);color:var(--muted);background:color-mix(in srgb,var(--card) 60%,transparent)}
.notice b{color:var(--ink)}
.calculator{padding:25px;min-height:270px}
.fields{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}
.fields label{color:var(--muted);font-size:12px;font-weight:700}
.fields input{width:100%;margin-top:6px;padding:13px;border:1px solid var(--line);border-radius:10px;background:var(--paper);color:var(--ink)}
.calculate{margin:20px 0;border:0;border-radius:10px;padding:13px 20px;background:var(--red);color:white;font-weight:800}
.results{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.metric{background:var(--paper);border-radius:12px;padding:14px}
.metric small{display:block;color:var(--muted)}
.metric b{font:700 20px Georgia,serif}
.coordinates{overflow:auto;max-height:240px}
.coordinates table{width:100%;border-collapse:collapse}
.coordinates td,.coordinates th{padding:7px;border-bottom:1px solid var(--line);text-align:right}
.saved-columns{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.saved-columns>div{background:var(--card);border:1px solid var(--line);border-radius:17px;padding:20px}
.saved-item{display:flex;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px solid var(--line)}
.saved-item small{display:block;color:var(--muted)}
footer{max-width:1180px;margin:auto;padding:30px 24px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted)}
#toast{position:fixed;bottom:24px;left:50%;translate:-50% 20px;background:var(--ink);color:var(--paper);padding:10px 18px;border-radius:99px;opacity:0;transition:.2s;pointer-events:none}
#toast.show{opacity:1;translate:-50% 0}
@media(max-width:650px){header{height:66px;padding:0 18px}
.hero{padding:38px 18px 25px}
.panel,nav{padding-left:16px;padding-right:16px}
.converter{grid-template-columns:1fr;padding:20px}
.swap{position:static;translate:0;justify-self:center;rotate:90deg}
.actions,.formula{grid-column:1}
.fields{grid-template-columns:1fr 1fr}
.saved-columns{grid-template-columns:1fr}
.section-head{align-items:start}
.section-head .soft{font-size:12px}
footer{margin:0 16px;padding:25px 0;flex-direction:column;gap:4px}
}

/* Weldbend industrial visual system — PMS 349 C / digital approximation #046A38. */
body{background-color:var(--paper);background-image:linear-gradient(rgba(4,106,56,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(4,106,56,.035) 1px,transparent 1px);background-size:24px 24px}
header{background:color-mix(in srgb,var(--paper) 94%,transparent);backdrop-filter:blur(10px)}
.brand-mark{width:42px;height:42px;background:var(--green);clip-path:polygon(12% 0,88% 0,100% 12%,100% 88%,88% 100%,12% 100%,0 88%,0 12%)}
.hero{text-align:center;position:relative;background:none;padding-top:70px}
.hero:before,.hero:after{content:"";position:absolute;top:30px;width:90px;height:90px;border-top:1px solid color-mix(in srgb,var(--green) 35%,transparent)}
.hero:before{left:24px;border-left:1px solid color-mix(in srgb,var(--green) 35%,transparent)}
.hero:after{right:24px;border-right:1px solid color-mix(in srgb,var(--green) 35%,transparent)}
.hero h1,.hero>p:not(.eyebrow){margin-left:auto;margin-right:auto}
.hero h1{max-width:820px}
.search{margin-left:auto;margin-right:auto;border-color:var(--green);border-radius:10px}
.search span,.eyebrow{color:var(--green)}
nav{justify-content:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
nav button{border-radius:6px;text-transform:uppercase;font-size:12px;letter-spacing:.06em}
nav button.active{color:#fff}
.section-head{justify-content:center;text-align:center;position:relative}
.section-head>.soft{position:absolute;right:0}
.chips,.tool-grid{justify-content:center}
.chips button,.tool-grid button,select,.icon,.soft{border-radius:6px}
.card{border-radius:10px;border-top:4px solid var(--green)}
.converter,.calculator,.notice{max-width:920px;margin-left:auto;margin-right:auto}
.converter{padding:30px}
.swap{border-radius:6px;color:#fff}
.notice{background:color-mix(in srgb,var(--card) 76%,transparent)}
@media(max-width:650px){.hero:before,.hero:after{display:none}.section-head>.soft{position:static}.section-head{text-align:left;justify-content:space-between}.chips,.tool-grid{justify-content:flex-start}}
.hero{display:flex;flex-direction:column;align-items:center;padding-top:54px}
.weldbend-logo{display:block;width:min(510px,82vw);height:auto;margin:0 auto 18px}
.hero h1{font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif;font-size:clamp(34px,5vw,58px);line-height:1.05;letter-spacing:.015em;margin:0 auto 15px;color:var(--green);text-align:center}
.hero .eyebrow{order:3;text-align:center}
.hero>p:not(.eyebrow){order:4;text-align:center}
.hero .search{order:5;width:min(760px,100%)}
.hero-theme{position:absolute;top:18px;right:24px}
.hero-theme{display:flex;align-items:center;gap:8px;font-weight:800;font-size:12px;text-transform:uppercase;letter-spacing:.04em}.theme-symbol{font-size:17px}.theme-label{white-space:nowrap}
@media(max-width:650px){.hero{padding-top:64px}.weldbend-logo{width:min(430px,90vw);margin-bottom:14px}.hero-theme{right:16px;top:14px}}
.chips{justify-content:flex-start;overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--green) var(--mint);padding-bottom:14px}
.chips::-webkit-scrollbar{height:9px}
.chips::-webkit-scrollbar-track{background:var(--mint);border-radius:10px}
.chips::-webkit-scrollbar-thumb{background:var(--green);border-radius:10px;border:2px solid var(--mint)}
.tool-grid{justify-content:flex-start;overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--green) var(--mint);padding-bottom:14px}
.tool-grid::-webkit-scrollbar{height:9px}
.tool-grid::-webkit-scrollbar-track{background:var(--mint);border-radius:10px}
.tool-grid::-webkit-scrollbar-thumb{background:var(--green);border-radius:10px;border:2px solid var(--mint)}
.scroll-shell{position:relative;display:grid;grid-template-columns:42px minmax(0,1fr) 42px;align-items:center;gap:8px;max-width:1060px;margin:0 auto 10px}
.scroll-shell>.chips,.scroll-shell>.tool-grid{min-width:0;margin:0;padding-bottom:12px}
.scroll-control{display:grid;place-items:center;width:42px;height:42px;border:1px solid var(--green);border-radius:6px;background:var(--green);color:#fff;font-size:30px;line-height:1;z-index:2}
.scroll-control:disabled{opacity:.28;cursor:default}
.swap{position:static;translate:none;grid-column:1/-1;justify-self:center;width:auto;height:auto;padding:10px 16px;display:flex;align-items:center;gap:8px;font-size:16px;white-space:nowrap}
.swap span{font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}
.converter output{font-size:clamp(30px,5vw,56px);text-overflow:ellipsis}
@media(max-width:650px){.scroll-shell{grid-template-columns:36px minmax(0,1fr) 36px;gap:5px}.scroll-control{width:36px;height:40px}.swap{rotate:0}}
[hidden]{display:none!important}
.settings-toggle{position:absolute;top:16px;right:24px;z-index:3;display:flex;align-items:center;gap:7px;font-weight:800;text-transform:uppercase;font-size:11px;letter-spacing:.05em}
.settings-panel{position:absolute;z-index:5;top:58px;right:24px;width:min(280px,calc(100% - 48px));padding:18px;background:var(--card);border:1px solid var(--green);border-radius:8px;box-shadow:var(--shadow);text-align:left}.settings-panel>b{display:block;margin-bottom:11px}.settings-panel label{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0;border-top:1px solid var(--line);font-size:13px;font-weight:700}.settings-panel select{width:auto;padding:7px}.settings-panel input{accent-color:var(--green);width:20px;height:20px}
.quick-tools{order:6;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:7px;margin-top:16px}.quick-tools>span{font-size:10px;font-weight:900;letter-spacing:.12em;color:var(--muted);margin-right:3px}.quick-tools button{border:1px solid var(--line);border-radius:99px;background:var(--card);color:var(--ink);padding:7px 11px;font-size:12px;font-weight:750}.quick-tools button:hover{border-color:var(--green);color:var(--green)}
.calculator-title{display:flex;align-items:center;justify-content:space-between;gap:16px}.calculator-title h3{margin:0}.reset-calc{font-size:12px}
.formula{background:var(--paper);border:1px solid var(--line);border-radius:7px;padding:14px!important;color:var(--ink)}
.converter output{white-space:normal;overflow-wrap:anywhere;line-height:1.05;min-width:0}
body.returning .hero{padding-top:32px;padding-bottom:24px}body.returning .weldbend-logo{width:min(350px,64vw);margin-bottom:8px}body.returning .hero h1{font-size:clamp(28px,4vw,42px);margin-bottom:8px}body.returning .hero>p:not(.eyebrow){display:none}body.returning .search{margin-top:16px}
@media(max-width:650px){.settings-toggle{top:10px;right:12px}.settings-panel{top:50px;right:12px;width:calc(100% - 24px)}.quick-tools{justify-content:flex-start;overflow-x:auto;flex-wrap:nowrap;width:100%;padding-bottom:5px}.quick-tools button,.quick-tools>span{white-space:nowrap}body.returning .hero{padding-top:54px}}

/* v3.2 deterministic converter layout and mobile refinement */
.converter{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;column-gap:18px}
.conversion-side{min-width:0}.conversion-side label,.conversion-side select{display:block;width:100%}.from-side{grid-column:1}.converter>.swap{grid-column:2;grid-row:1;position:static!important;inset:auto!important;translate:none!important;transform:none!important;rotate:none!important;writing-mode:horizontal-tb!important;align-self:center}.to-side{grid-column:3}.converter>.actions,.converter>.formula{grid-column:1/-1}.conversion-side output{max-width:100%}
@media(max-width:650px){
  .hero{padding:54px 14px 22px}.weldbend-logo{width:min(300px,82vw)}.hero h1{font-size:30px}.hero .eyebrow{font-size:9px}.hero>p:not(.eyebrow){font-size:14px}.search{margin-top:18px}
  nav{justify-content:flex-start;overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--green) var(--mint);padding:8px 10px}nav button{flex:0 0 auto;padding:9px 13px;font-size:10px}
  .panel{padding:24px 12px 48px}.section-head{align-items:flex-start;gap:8px}.section-head h2{font-size:clamp(27px,9vw,34px);line-height:1.05}.section-head>.soft{flex:0 0 auto}
  .converter{display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto auto auto;gap:15px;padding:20px 16px}.from-side{grid-column:1;grid-row:1}.converter>.swap{grid-column:1;grid-row:2;justify-self:center;rotate:none!important;transform:none!important;writing-mode:horizontal-tb!important}.to-side{grid-column:1;grid-row:3}.converter>.actions{grid-column:1;grid-row:4}.converter>.formula{grid-column:1;grid-row:5}.converter input,.converter output{font-size:36px}.conversion-side select{margin-top:8px;padding:12px}.actions{flex-wrap:wrap}
  .notice{font-size:13px}.scroll-shell{max-width:100%}
}