:root{color-scheme:light;--ink:#153026;--muted:#4d655b;--green:#154b37;--paper:#f7f7ee;--border:#d8e1d6;--accent:#d8edaa;font-family:"DM Sans",Arial,sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0}
[dir=rtl]{font-family:Tahoma,Arial,sans-serif}
header{border-bottom:1px solid var(--border);background:#fff}
nav,main,footer>div{max-width:1160px;margin:auto;padding-inline:28px}
nav,footer>div{min-height:75px;display:flex;align-items:center;justify-content:space-between;gap:16px}
a{color:var(--green)}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:800}
.mark,.icon{background:var(--accent);color:var(--green);border-radius:12px;display:grid;place-items:center;width:36px;height:36px}
.language,.back{font-weight:700;text-underline-offset:4px}
main{padding-block:40px 76px;min-height:72vh}
h1,h2,h3,p{margin-block-start:0}
h1,h2,h3{line-height:1.17}
h1{font-size:clamp(2.6rem,7vw,5.2rem);letter-spacing:-.055em;margin-block-end:18px;font-weight:800}
[dir=rtl] h1{letter-spacing:0;line-height:1.35}
h2{font-size:clamp(1.35rem,3vw,2rem)}
p{line-height:1.65;color:var(--muted)}
.hero{background:#e9efdc;border:1px solid #dce5d2;border-radius:30px;display:grid;grid-template-columns:1.1fr .9fr;gap:22px;padding:clamp(24px,5vw,64px);align-items:center;min-height:385px;margin-block-end:48px;overflow:hidden}
.hero p,.tool-intro p{font-size:1.1rem;max-width:50ch}
.button,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:46px;padding:10px 18px;border:1px solid transparent;border-radius:10px;text-decoration:none;font:inherit;font-weight:700;cursor:pointer}
.button{background:var(--green);color:white}
.secondary{background:#fff;border-color:var(--border);color:var(--green)}
.button:hover{background:#23674d}.secondary:hover{background:#e9efdc}
:focus-visible{outline:3px solid #367b55;outline-offset:3px}
.drawing{position:relative;min-height:258px;border-radius:20px;background-color:#1d503c;background-image:linear-gradient(#ffffff1a 1px,transparent 1px),linear-gradient(90deg,#ffffff1a 1px,transparent 1px);background-size:21px 21px;display:grid;place-items:center;overflow:hidden}
.plan{width:55%;height:58%;border:4px solid #daedbb;display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;transform:rotate(-10deg);box-shadow:0 0 0 10px #c9e4b020}
.plan span:first-child{grid-row:span 2;border-inline-end:3px solid #daedbb}.plan span:nth-child(2){border-bottom:3px solid #daedbb}.plan span:nth-child(3){background:repeating-linear-gradient(135deg,transparent 0 10px,#d8edaa45 11px 12px)}
.ruler{position:absolute;bottom:13%;right:11%;width:44%;height:22px;transform:rotate(-10deg);border-radius:4px;background:repeating-linear-gradient(90deg,#607645 0 1px,transparent 1px 12px) top left/100% 8px no-repeat,var(--accent)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,225px),1fr));gap:14px}
.card{position:relative;display:grid;align-content:start;gap:12px;min-height:170px;background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px;text-decoration:none}
.card:hover{border-color:#57876b;background:#f9fcf5}.card strong{font-size:1.15rem}.card>span:not(.icon){color:var(--muted);line-height:1.45}.card b{position:absolute;inset-inline-end:18px;top:20px}
.tool-intro{margin-block-end:28px}.tool-intro h1{font-size:clamp(2.35rem,6vw,4.2rem);margin-block-start:12px}
.workspace{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:22px;align-items:start}
form,.result,.explanation{background:#fff;border:1px solid var(--border);border-radius:20px;padding:clamp(16px,3vw,30px)}
.result{background:#e9efdc}.result h2{margin-bottom:14px}.total{font-weight:800;font-size:clamp(2rem,5vw,3.6rem);overflow-wrap:anywhere}.result dl div{display:flex;justify-content:space-between;gap:12px;border-top:1px solid #cbd8c4;padding:12px 0}.result dd{margin:0;font-weight:700}.note{font-size:.88rem}
fieldset{border:1px solid var(--border);border-radius:12px;margin:16px 0;padding:14px;min-width:0}legend{font-weight:700;padding-inline:5px}
.pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.pair .pair{gap:6px}label{display:grid;align-content:start;gap:5px;font-weight:600;font-size:.9rem;min-width:0}
.input{display:flex;align-items:center;background:#fff;border:1px solid #98afa1;border-radius:8px;min-width:0;overflow:hidden}.input span{padding-inline:6px;font-size:.75rem;color:var(--muted)}
input,select,textarea{font:inherit;color:var(--ink);min-width:0;width:100%;min-height:44px;padding:8px;background:#fff;border:1px solid #98afa1;border-radius:8px}.input input{border:0}.input:focus-within{outline:2px solid #367b55}.input:has([aria-invalid=true]){border-color:#a62420}
.error{color:#a62420}.error:empty,#copy-status:empty{display:none}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-block-start:10px}.explanation{margin-block:24px 34px}.explanation p:last-child{margin-bottom:0}
footer{border-top:1px solid var(--border)}footer>div{justify-content:start;flex-wrap:wrap;padding-block:14px}
.skip{position:absolute;inset-inline-start:12px;top:8px;transform:translateY(-150%);background:white;padding:10px;z-index:1}.skip:focus{transform:none}
.directory-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.directory-controls{background:#fff;border:1px solid var(--border);border-radius:18px;padding:20px;margin-block-end:18px}
.directory-controls input{max-width:34rem}.filters{display:flex;flex-wrap:wrap;gap:8px;margin-block-start:14px}
.filters button{font-size:.85rem}.filters button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green)}
.card .category-label{font-size:.78rem;font-weight:700;color:var(--green);padding-inline-end:20px}
.example-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px}.example-grid div{background:var(--paper);padding:10px;border-radius:8px}.example-grid dt{font-size:.85rem}.example-grid dd{margin:0;font-weight:700}
@media(max-width:700px){nav,main,footer>div{padding-inline:16px}.hero,.workspace{grid-template-columns:1fr}.drawing{min-height:170px}main{padding-block-start:26px}.hero{min-height:0;border-radius:20px}.pair>.pair{grid-template-columns:1fr}.result dl div{flex-wrap:wrap}}