:root{--ink:#14211d;--card:#fff;--lime:#d7ff59;--teal:#12776c;--line:#d9dedb;--muted:#59635f}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:#fff}
body{margin:0;background:#fff;color:var(--ink);font:16px/1.55 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:inherit}
header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,5vw,72px);border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);position:sticky;top:0;z-index:5}
.brand{text-decoration:none;font-size:25px;font-weight:900;letter-spacing:-1px}
.brand i{font-style:normal;color:var(--teal)}
nav{display:flex;gap:24px}
nav a{text-decoration:none;font-weight:700;font-size:14px}
main{max-width:1280px;margin:auto;padding:0 clamp(20px,5vw,72px);background:#fff}
.hero{min-height:620px;display:grid;grid-template-columns:1.45fr .75fr;gap:8vw;align-items:center;border-bottom:1px solid var(--line)}
.eyebrow{font-size:12px;font-weight:900;letter-spacing:.18em;color:var(--teal)}
h1{font-size:clamp(46px,6.8vw,92px);line-height:.98;letter-spacing:-.055em;margin:.2em 0}
h1 em{font-family:Georgia,serif;font-weight:400;color:var(--teal)}
.hero>div>p:not(.eyebrow){font-size:20px;max-width:660px;color:var(--muted)}
.button{display:inline-block;border:0;background:var(--ink);color:white;padding:15px 22px;text-decoration:none;font-weight:850;border-radius:3px;cursor:pointer}
.button:hover{background:var(--teal)}
.formula{background:var(--lime);padding:34px;min-height:350px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:12px 12px 0 var(--ink);transform:rotate(1.5deg)}
.formula span,.formula code{font-size:12px;font-weight:900;letter-spacing:.12em}
.formula strong{font:700 38px/1.05 Georgia,serif}
.section-head,.page-head,.calc-head{padding:90px 0 40px}
.section-head h2,.explain h2{font:700 clamp(34px,5vw,56px)/1.05 Georgia,serif;margin:.15em 0}
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:28px}
.filters a{border:1px solid var(--ink);padding:8px 13px;text-decoration:none;font-weight:750;font-size:13px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding-bottom:90px}
.tool-card{border:1px solid var(--line);padding:0;text-decoration:none;display:flex;flex-direction:column;transition:.2s;overflow:hidden;color:var(--ink);background:#fff;border-radius:8px}
.tool-card-image{display:block;width:100%;aspect-ratio:16/9;background:var(--thumb) center/cover no-repeat;border-bottom:1px solid var(--line);transition:transform .25s}
.tool-card.concrete-calculator{--thumb:url('/concrete-calculator.jpg')}.tool-card.paint-calculator{--thumb:url('/paint-calculator.jpg')}.tool-card.fence-calculator{--thumb:url('/fence-calculator.jpg')}.tool-card.flooring-calculator{--thumb:url('/flooring-calculator.jpg')}
.tool-card.grams-to-cups{--thumb:url('/grams-to-cups.jpg')}.tool-card.recipe-scaler{--thumb:url('/recipe-scaler.jpg')}.tool-card.pan-size-converter{--thumb:url('/pan-size-converter.jpg')}.tool-card.sourdough-hydration{--thumb:url('/sourdough-hydration.jpg')}
.tool-card.resistor-color-code{--thumb:url('/resistor-color-code.jpg')}.tool-card.ohms-law-calculator{--thumb:url('/ohms-law-calculator.jpg')}.tool-card.led-resistor-calculator{--thumb:url('/led-resistor-calculator.jpg')}.tool-card.voltage-divider-calculator{--thumb:url('/voltage-divider-calculator.jpg')}
.tool-card.markup-margin-calculator{--thumb:url('/markup-margin-calculator.jpg')}.tool-card.break-even-calculator{--thumb:url('/break-even-calculator.jpg')}.tool-card.hourly-rate-calculator{--thumb:url('/hourly-rate-calculator.jpg')}.tool-card.project-quote-calculator{--thumb:url('/project-quote-calculator.jpg')}
.tool-card.wedding-alcohol-calculator{--thumb:url('/wedding-alcohol-calculator.jpg')}.tool-card.party-drink-calculator{--thumb:url('/party-drink-calculator.jpg')}.tool-card.catering-portions-calculator{--thumb:url('/catering-portions-calculator.jpg')}.tool-card.cake-servings-calculator{--thumb:url('/cake-servings-calculator.jpg')}
.tool-card:hover{transform:translateY(-4px);border-color:var(--teal);box-shadow:0 12px 30px #14211d1f}.tool-card:hover .tool-card-image{transform:scale(1.025)}
.tool-card h3{font-size:21px;line-height:1.2;margin:0;padding:18px 20px 20px;color:var(--ink);font-weight:800}
.page-head p,.calc-head p{max-width:720px;font-size:20px;color:var(--muted)}
.page-head h1,.calc-head h1{font-size:clamp(45px,7vw,78px)}
.calculator{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:start;padding-bottom:60px}
form,#result{background:var(--card);border:1px solid var(--line);padding:30px}
#fields{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-bottom:25px}
label{font-size:13px;font-weight:800;display:flex;flex-direction:column;gap:7px}
input,select{width:100%;padding:12px;border:1px solid #9ba49f;background:white;font:inherit;border-radius:6px}.input-row{display:flex;gap:8px}.input-row .unit-select{width:auto;min-width:82px;font-weight:750}.form-control,.form-select{min-height:48px;border-color:#9ba49f;border-radius:6px;box-shadow:0 1px 2px rgba(20,33,29,.06)}.form-control:focus,.form-select:focus{border-color:var(--teal);box-shadow:0 0 0 .25rem rgba(18,119,108,.16)}#calc-form .btn{padding:.8rem 1.35rem;border-radius:6px;font-weight:850;letter-spacing:.01em}#calc-form .btn:hover,#calc-form .btn:focus{background:var(--teal);border-color:var(--teal)}
.calc-visual{grid-column:1/-1;margin:0 0 24px;border:1px solid var(--line);border-radius:8px;background:#f7faf8;padding:14px;min-height:180px;overflow:hidden}
.calc-visual svg{display:block;width:100%;height:auto;max-height:250px}.calc-visual svg path,.calc-visual svg line,.calc-visual svg ellipse,.calc-visual svg circle,.calc-visual svg rect{stroke:var(--ink);stroke-width:3;vector-effect:non-scaling-stroke}.calc-visual svg line,.calc-visual svg path{fill:none}.calc-visual svg .fill{fill:#e7f2ee}.calc-visual svg .gate{fill:#fff}.calc-visual svg .resistor{fill:#ead7af}.calc-visual svg .node{fill:var(--teal)}.calc-visual svg text{fill:var(--ink);stroke:none;font:700 14px Inter,system-ui;text-anchor:middle}.calc-visual svg .bar{stroke:none}.calc-visual svg .bar-0{fill:#12776c}.calc-visual svg .bar-1{fill:#d7a94e}.calc-visual svg .bar-2{fill:#805ad5}.calc-visual svg .track{fill:#dfe7e3;stroke:none}
#result{background:var(--ink);color:white;position:sticky;top:100px}
#result span{color:var(--lime);font-size:11px;font-weight:900;letter-spacing:.15em}
#result h2{font:700 34px/1.1 Georgia,serif;margin:18px 0}
#result p{color:#d8e1dd}
.result-list{display:grid;gap:10px;margin-top:20px}
.result-list div{display:flex;justify-content:space-between;border-top:1px solid #ffffff2e;padding-top:10px}
.result-list b{color:var(--lime)}
.explain{max-width:820px;padding:30px 0 100px}
.notice{border-left:5px solid var(--lime);padding:14px 18px;background:var(--card)}
.prose{max-width:850px;min-height:520px}
.prose p{font-size:22px}
footer{border-top:1px solid var(--line);padding:50px clamp(20px,5vw,72px);display:grid;grid-template-columns:1fr 1fr;gap:30px}
footer>div:nth-child(2){display:flex;gap:20px;justify-content:flex-end}
footer small{grid-column:1/-1;color:var(--muted)}
@media(max-width:850px){nav a:not(:first-child){display:none}
.hero,.calculator{grid-template-columns:1fr}
.hero{padding:80px 0}
.formula{min-height:260px;margin-bottom:70px}
.grid{grid-template-columns:1fr 1fr}
#result{position:static}
#fields{grid-template-columns:1fr}
}
@media(max-width:560px){.grid{grid-template-columns:1fr}
footer{grid-template-columns:1fr}
footer>div:nth-child(2){justify-content:flex-start;flex-wrap:wrap}
h1{font-size:48px}
}