:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#173b39;background:#f7f8f3;font-synthesis:none;--green:#135e50;--line:#dce3d9}*{box-sizing:border-box}body{margin:0}a{color:inherit}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #d28a28;outline-offset:4px}.skip{position:absolute;top:-80px;background:white;padding:12px}.skip:focus{top:0}header{max-width:1200px;margin:auto;padding:26px 32px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{font-size:19px;font-weight:800;text-decoration:none;display:flex;gap:11px;align-items:center}.mark{background:var(--green);color:#e6f4bb;display:grid;place-items:center;width:36px;height:36px;border-radius:12px;font-size:24px}nav{display:flex;gap:24px;font-size:14px}nav a{text-decoration:none}main{max-width:1200px;margin:auto;padding:55px 32px 80px}.eyebrow{text-transform:uppercase;font-weight:700;font-size:12px;letter-spacing:2px;color:#50705e}.hero{display:grid;grid-template-columns:1.3fr 1fr;align-items:center;gap:70px;margin:12px 0 58px}h1{font-size:clamp(38px,5vw,66px);line-height:1.07;letter-spacing:-2.8px;font-weight:650;margin:18px 0 24px}h1 em{font-style:normal;color:#26735d}p{line-height:1.7;color:#58706b}.intro{font-size:18px;max-width:570px}.hero-art{background:#e8eddd;border-radius:28px;padding:38px;transform:rotate(2deg)}.sample{background:#fff;padding:28px;border-radius:18px;box-shadow:0 16px 30px #23462b10}.sample small{color:#6a7b70}.sample strong{font-size:46px;font-weight:600;display:block;margin:14px 0;color:#205e4a}.sample span{font-size:14px}.pills{display:flex;gap:9px;flex-wrap:wrap;margin-top:24px}.pill{border:1px solid #d6dfcf;border-radius:30px;padding:7px 12px;font-size:12px;color:#426b50}.section-title{font-size:28px;letter-spacing:-.8px;margin:0}.toolbar{display:flex;justify-content:space-between;gap:24px;align-items:center;margin:22px 0}.search{min-width:280px}.filters{display:flex;gap:8px;flex-wrap:wrap}.filters button{border:1px solid var(--line);border-radius:30px;background:transparent;padding:10px 17px;color:#375b4c}.filters button[aria-pressed=true]{color:white;background:var(--green);border-color:var(--green)}input,select{width:100%;border:1px solid #c5d1c5;border-radius:10px;padding:14px;background:#fff;color:#173b39;min-height:49px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:25px;text-decoration:none;transition:transform .15s,border-color .15s;position:relative}.card:hover{transform:translateY(-3px);border-color:#50866e}.icon{display:grid;place-items:center;background:#eff3e9;width:44px;height:44px;border-radius:12px;font-size:25px;color:#317659}.card h3{font-size:18px;margin:20px 0 9px;letter-spacing:-.4px}.card p{font-size:14px;margin:0;padding-right:8px}.arrow{position:absolute;right:24px;top:29px;color:#6b8e76}.note-band{margin-top:48px;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);gap:32px;padding-top:26px}.note-band h3{font-size:15px}.note-band p{font-size:13px}.crumb{font-size:13px;color:#567066}.tool-heading{max-width:770px;margin-bottom:32px}.tool-heading h1{font-size:46px;letter-spacing:-1.7px}.tool-layout{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(260px,1fr);gap:28px}.panel{background:white;border:1px solid var(--line);border-radius:20px;padding:30px}label{display:block;font-size:14px;font-weight:650;margin:0 0 9px}.field{margin-bottom:22px}.row{display:grid;grid-template-columns:1fr 1fr;gap:18px}.primary{background:var(--green);color:white;border:0;padding:14px 24px;border-radius:10px;font-weight:650}.secondary{border:1px solid var(--line);background:white;border-radius:9px;padding:10px 15px;color:#275842}.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}button:disabled{opacity:.5;cursor:wait}.result{margin-top:28px;padding:25px;background:#edf4df;border-radius:13px;overflow-wrap:anywhere}.result small{color:#486345}.result output{display:block;font-size:32px;letter-spacing:-1px;font-weight:650;margin-top:9px}.error{color:#a12d28;font-size:14px;min-height:20px}.help{font-size:13px}.formula{background:#eff2e9;border-radius:10px;padding:17px;line-height:1.7;font-size:14px}aside h2{font-size:19px}.keypad{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin-bottom:22px}.keypad button{padding:11px 4px;border:1px solid var(--line);background:#f8faf5;border-radius:8px;color:#214f40}.status{font-size:12px;color:#617368}footer{max-width:1200px;margin:auto;border-top:1px solid var(--line);padding:25px 32px;display:flex;justify-content:space-between;font-size:12px;color:#64786b}[hidden]{display:none!important}@media(max-width:850px){.hero{gap:25px}.hero-art{padding:20px}.grid{grid-template-columns:repeat(2,1fr)}.toolbar{align-items:stretch;flex-direction:column}.tool-layout{grid-template-columns:1fr}}@media(max-width:550px){header{padding:20px}nav{gap:13px;font-size:12px}main{padding:30px 20px 50px}.hero{grid-template-columns:1fr;gap:20px;margin-bottom:40px}.hero-art{display:none}h1{letter-spacing:-1.8px}.grid{grid-template-columns:1fr}.card{padding:23px}.note-band{grid-template-columns:1fr;gap:8px}.tool-heading h1{font-size:36px}.panel{padding:22px}.row{grid-template-columns:1fr;gap:0}.search{min-width:0}.result output{font-size:28px}footer{gap:20px;flex-wrap:wrap}.brand{font-size:16px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;transform:none!important}}
.calc-mode{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;gap:12px}.calc-mode>span{font-size:11px;letter-spacing:2px;font-weight:750}.calc-screen{background:#eaf0df;border:1px solid #ccdac2;padding:20px 16px 8px;border-radius:12px}.calc-screen input{background:transparent;border:0;border-bottom:1px solid #b7c6ad;border-radius:0;font-family:ui-monospace,monospace;font-size:24px;text-align:right}.scientific button{min-height:48px;font-size:18px;box-shadow:0 2px 0 #d5ddd0}.scientific button[data-key="sin("],.scientific button[data-key="cos("],.scientific button[data-key="tan("],.scientific button[data-key="ln("],.scientific button[data-key="log("]{font-size:15px;background:#e7ede3}#clear{background:#f4e5d8;color:#85492e}#backspace{background:#e7ede3}
header{flex-wrap:wrap;gap:16px}.language-picker{position:relative;max-width:100%;font-size:14px}.language-picker summary{cursor:pointer;padding:10px;border:1px solid var(--line);border-radius:8px}.language-picker nav{position:absolute;inset-inline-end:0;z-index:10;display:grid;grid-template-columns:1fr 1fr;gap:4px;min-width:270px;max-width:90vw;padding:12px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 24px #173b3920}.language-picker a{padding:8px}.language-picker a[aria-current]{font-weight:700;text-decoration:underline}summary:focus-visible{outline:3px solid #d28a28;outline-offset:3px}[dir=rtl] h1{letter-spacing:normal;line-height:1.4}[dir=rtl] .card,[dir=rtl] .panel{text-align:start}[dir=rtl] input{direction:ltr;text-align:left}.math{unicode-bidi:isolate;overflow-wrap:anywhere}bdi{unicode-bidi:isolate}.field .help{margin-top:6px}select{max-width:100%}.brand{white-space:nowrap}@media(max-width:550px){.language-picker{width:100%}.language-picker nav{inset-inline-start:0;inset-inline-end:auto}.tool-heading h1{overflow-wrap:anywhere}[dir=rtl] .tool-heading h1{font-size:30px}}
.ad-slot{position:static;display:block;clear:both;isolation:isolate;margin-block:64px 24px;margin-inline:auto;padding:20px 0 0;border-top:1px solid var(--line);max-width:min(100%,var(--ad-max-width,728px));width:100%;overflow-wrap:anywhere}.ad-slot[hidden]{display:none!important}.ad-label{margin:0 0 12px;font-size:12px;font-weight:500;color:#58706b;text-align:center}.ad-mount{min-height:var(--ad-min-height,90px);max-width:100%;overflow:hidden}.ad-mount iframe,.ad-mount img{max-width:100%;border:0}.ad-slot--native .ad-mount{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:16px}@media(max-width:550px){.ad-slot{margin-block-start:48px;max-width:100%}}
/* Compact native language dropdown, independent of tool forms. */
.language-picker{display:flex;align-items:center;gap:8px;max-width:100%;margin:0;font-size:13px}.language-picker label{margin:0}.language-controls{display:flex;align-items:center;gap:6px;min-width:0}.language-picker select{width:160px;max-width:100%;min-height:44px;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff;color:inherit}.language-picker button{min-height:44px;padding:8px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;color:inherit;white-space:nowrap}@media(max-width:550px){.language-picker{width:auto;flex-wrap:wrap}.language-controls{max-width:100%}.language-picker select{width:150px}}
/* Header items shrink within their cells; phone layout has two predictable rows. */
header>*{min-width:0}header>.brand{max-width:100%;white-space:normal;overflow-wrap:anywhere}header .mark{flex-shrink:0}.language-picker{min-width:0;gap:6px}.language-picker label{white-space:normal;overflow-wrap:anywhere}.language-controls{flex:1;min-width:0}.language-picker select{width:100%;min-width:0;max-width:180px;box-sizing:border-box}
@media(max-width:600px){header{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;padding:16px}.brand{grid-column:1/-1}header>nav{min-width:0;flex-wrap:wrap;gap:8px 12px;align-content:center}header>nav a{overflow-wrap:anywhere}.language-picker{width:100%;display:block;justify-self:end}.language-picker label{font-size:12px;margin-block-end:4px}.language-controls{width:100%}.language-picker select{width:100%;max-width:100%;min-height:44px;padding:8px 4px}header>noscript{grid-column:1/-1}}
.ad-consent{margin-block:64px 24px;border-block-start:1px solid var(--line);padding-block-start:24px}.ad-consent p{font-size:13px;max-width:75ch}.ad-consent button{border:1px solid var(--line);border-radius:8px;background:white;color:inherit;padding:12px;min-height:44px}.ad-frames{width:100%;min-width:0;display:flex;flex-direction:column;align-items:center;gap:64px;margin-block-start:24px}.ad-frames iframe{border:0;flex-shrink:0;max-width:100%;background:transparent}