:root{--ink:#17251f;--muted:#5f6d66;--paper:#f4f1e8;--card:#fffdf7;--line:#cfc9bb;--green:#185845;--red:#a94134}*{box-sizing:border-box}body{margin:0;min-width:320px;color:var(--ink);font-family:Arial,Helvetica,sans-serif;background:linear-gradient(90deg,rgba(23,37,31,.035) 1px,transparent 1px) 0 0/42px 42px,var(--paper)}button,input{font:inherit}.site-header,.page-shell{width:min(1220px,calc(100% - 40px));margin:auto}.site-header{min-height:86px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.site-header>p{color:var(--muted);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none}.brand-mark{width:42px;height:42px;display:grid;place-items:center;color:#fff;background:var(--green);border-radius:50% 50% 42% 58%/46% 42% 58% 54%;transform:rotate(-4deg);font-weight:800;font-size:.82rem}.brand>span:last-child{display:grid;gap:2px}.brand small{color:var(--muted);font-size:.7rem;text-transform:uppercase;letter-spacing:.12em}.intro{display:grid;grid-template-columns:1.3fr .7fr;gap:64px;align-items:end;padding:64px 0 44px}.eyebrow,.heading p,.result>p,.rail-label{margin:0 0 12px;color:var(--green);font-size:.72rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase}.intro h1{max-width:760px;margin:0;font-size:clamp(2.45rem,6vw,5.6rem);line-height:.98;letter-spacing:-.065em}.intro>p{max-width:430px;margin:0;color:var(--muted);line-height:1.7}.calculator-layout{display:grid;grid-template-columns:214px minmax(0,1fr);gap:22px;align-items:start}.tab-rail{position:sticky;top:18px;padding:18px;border:1px solid var(--line);border-radius:14px;background:rgba(255,253,247,.8);backdrop-filter:blur(12px)}.rail-label{display:block;padding:0 7px 12px;border-bottom:1px solid var(--line);color:var(--muted)}.tab{width:100%;margin-top:4px;padding:11px 12px;border:0;border-radius:8px;background:transparent;color:var(--muted);text-align:left;font-weight:700;cursor:pointer}.tab.active{background:var(--green);color:#fff}.panel{display:none;min-height:520px;padding:clamp(24px,4vw,48px);border:1px solid var(--line);border-radius:14px;background:var(--card);box-shadow:0 18px 50px rgba(35,44,38,.08)}.panel.active{display:block}.heading{display:flex;justify-content:space-between;gap:32px;align-items:start;padding-bottom:28px;margin-bottom:30px;border-bottom:1px solid var(--line)}.heading h2{margin:0;font-size:clamp(1.8rem,4vw,3.15rem);line-height:1.02;letter-spacing:-.045em}.heading code{max-width:420px;padding:10px 12px;border:1px solid #d6dacd;border-radius:7px;background:#eef1e9;color:#385347;font-size:.75rem;line-height:1.5}.input-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.input-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.input-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.input-grid.single{grid-template-columns:1fr}label{display:grid;grid-template-columns:1fr auto;gap:8px;font-size:.86rem;font-weight:800}label span{color:var(--muted);font-size:.7rem;text-transform:uppercase;letter-spacing:.06em}label input{grid-column:1/-1;width:100%;height:52px;padding:0 12px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--ink);font-size:1.12rem;font-weight:750}label input:focus{outline:3px solid rgba(44,118,94,.14);border-color:var(--green)}label small{grid-column:1/-1;color:var(--muted);font-weight:400;line-height:1.4}.result{position:relative;overflow:hidden;margin-top:28px;padding:26px 28px;border-radius:10px;background:var(--green);color:#fff}.result:after{content:"";position:absolute;inset:0 0 0 auto;width:31%;opacity:.12;background:repeating-linear-gradient(90deg,transparent 0 16px,#fff 16px 17px)}.result>p{color:#b8dbc9;margin-bottom:7px}.result>div{position:relative;z-index:1;display:flex;align-items:baseline;gap:12px}.result strong{font-size:clamp(2.7rem,7vw,5.2rem);line-height:1;letter-spacing:-.05em}.result div span{font-weight:800}.result>small{position:relative;z-index:1;display:block;margin-top:12px;color:#d9eee3}.dart-layout{display:grid;grid-template-columns:1fr .8fr;gap:28px}.actions{display:flex;gap:10px;margin-top:22px}.actions button,.pass-fail button{padding:11px 16px;border:0;border-radius:7px;font-weight:800;cursor:pointer}.primary{background:var(--green);color:#fff}.secondary{border:1px solid var(--line)!important;background:#fff}.dart-console{min-height:350px;padding:22px;border-radius:10px;background:#182a23;color:#fff}.dart-empty{min-height:300px;display:grid;place-content:center;text-align:center}.dart-empty span,.dart-status span,.dart-estimate span{color:#a9c4b7;font-size:.7rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase}.dart-empty p{max-width:260px;color:#c7d7cf;line-height:1.6}.dart-status{display:flex;justify-content:space-between;padding-bottom:18px;border-bottom:1px solid rgba(255,255,255,.16)}.dart-status div{display:grid;gap:5px}.dart-status strong{font-size:1.75rem}.dart-status>b{color:#a9c4b7}.pass-fail{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.pass-fail button{height:52px;color:#fff}.pass-fail button:first-child{background:#2b7b60}.pass-fail button:last-child{background:var(--red)}.dart-estimate{display:grid;gap:5px;padding:15px;border-radius:8px;background:rgba(255,255,255,.08)}.dart-estimate strong{font-size:1.3rem}#dart-history{list-style:none;padding:0;margin:16px 0 0}#dart-history li{display:grid;grid-template-columns:42px 1fr auto;gap:10px;padding:9px 4px;border-bottom:1px solid rgba(255,255,255,.1);font-size:.78rem}#dart-history span{color:#8ca99b}#dart-history .pass{color:#73d0a6}#dart-history .fail{color:#f09483}footer{display:flex;justify-content:space-between;gap:40px;margin:48px 0 24px;padding:24px 0;border-top:1px solid var(--line);color:var(--muted);font-size:.78rem;line-height:1.5}footer p{margin:0}[hidden]{display:none!important}@media(max-width:900px){.intro{grid-template-columns:1fr;gap:24px;padding-top:46px}.calculator-layout{grid-template-columns:1fr}.tab-rail{position:static;display:flex;overflow-x:auto;padding:10px}.rail-label{display:none}.tab{width:auto;flex:0 0 auto;white-space:nowrap;text-align:center}.heading{display:grid}.input-grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:620px){.site-header,.page-shell{width:calc(100% - 24px)}.site-header>p{display:none}.intro{padding:36px 2px 28px}.panel{min-height:0;padding:22px 16px}.heading{gap:18px}.input-grid,.input-grid.two,.input-grid.four,.dart-layout{grid-template-columns:1fr}.result{padding:22px 20px}.result strong{font-size:3.25rem}footer{display:grid;gap:10px}}
