@font-face{font-family:"Archivo";src:url(/fonts/archivo.woff2) format("woff2");font-weight:400 800;font-display:swap}
:root{--ink:#1c1e20;--muted:#5d6166;--line:#e3e2de;--tape:#f2b705;--tape-dk:#c79400;--tape-soft:#fdf4d6;--body:#2a2e33;--key:#3b4148;--key-hi:#4a5159;--lcd:#c6cfb2;--lcd-ink:#1f2a17;--warn:#9a3412;--warn-bg:#fff4ec;--bg:#fff}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.62 "Archivo",system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--ink);text-decoration-color:var(--tape-dk);text-decoration-thickness:2px;text-underline-offset:3px}a:hover{text-decoration-color:var(--ink)}
:focus-visible{outline:3px solid #2f6fe0;outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line);border-top:5px solid var(--tape)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--ink);text-decoration:none}.brand svg{width:28px;height:28px}
nav.main{display:flex;gap:20px}nav.main a{color:var(--muted);text-decoration:none;font-size:.95rem}nav.main a:hover,nav.main a[aria-current]{color:var(--ink)}nav.main a[aria-current]{font-weight:700;box-shadow:inset 0 -3px 0 var(--tape)}
main{padding:24px 20px 64px}
main.wrap>*:not(.hero):not(.tool){max-width:720px;margin-left:auto;margin-right:auto}
main.wrap>.tool{max-width:960px;margin-left:auto;margin-right:auto}
h1{font-size:clamp(2rem,4.6vw,3rem);line-height:1.04;letter-spacing:-.03em;font-weight:800;margin:.25em 0 .35em}
h2{font-size:1.55rem;line-height:1.2;letter-spacing:-.015em;margin:2em 0 .5em;font-weight:800}
h3{font-size:1.1rem;margin:1.4em 0 .25em}
.lead{font-size:1.1rem;color:var(--muted);margin-top:0}
.breadcrumb{font-size:.9rem;color:var(--muted)}
code{background:var(--tape-soft);padding:1px 5px;border-radius:4px;font-size:.92em}
input,select,button,textarea{font:inherit;color:inherit}
input,select{width:100%;border:1px solid #cfcdc6;border-radius:6px;padding:9px 10px;background:#fff}
input:focus,select:focus{outline:2px solid var(--tape);border-color:var(--tape-dk)}
button.link{background:none;border:0;color:inherit;text-decoration:underline;cursor:pointer;padding:0}

/* home hero: text left, the calculator right */
.hero{display:grid;grid-template-columns:1fr minmax(0,540px);gap:48px;align-items:start;max-width:1080px;margin:0 auto;padding:16px 0 28px;border-bottom:1px solid var(--line)}
.hero-text{padding-top:20px}
.hero-try{font-size:.98rem;border-left:4px solid var(--tape);padding:4px 0 4px 12px}

/* sub-page tools: spec sheet with a tape-yellow edge */
.tool{background:#fff;border:1px solid var(--line);border-top:6px solid var(--tape);border-radius:6px;padding:20px;margin:20px 0}

/* the calculator itself */
.tool.device{background:var(--body);border:0;border-radius:22px;padding:20px 18px 18px;color:#e8eaec;box-shadow:0 18px 40px rgba(20,22,25,.28),inset 0 1px 0 rgba(255,255,255,.08);margin:0}
.device .lab{display:block;font-size:.82rem;color:#aab0b6;margin:0 2px 8px}
.lcd{background:var(--lcd);border-radius:8px;padding:10px 14px 8px;box-shadow:inset 0 3px 8px rgba(0,0,0,.28);color:var(--lcd-ink);margin-bottom:16px}
.device .expr{background:transparent;border:0;padding:0;font-size:1.1rem;color:var(--lcd-ink);font-variant-numeric:tabular-nums;outline:none}
.device .expr:focus{outline:none}
.lcd:focus-within{box-shadow:inset 0 3px 8px rgba(0,0,0,.28),0 0 0 3px var(--tape)}
.res{display:flex;align-items:baseline;justify-content:flex-end;gap:14px;flex-wrap:wrap;min-height:2.8rem}
.big{font-size:2.2rem;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.01em;text-align:right}
.err{color:var(--warn);font-size:.95rem}
.device .err{color:#7a1d0c}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
.device .grid2{grid-template-columns:1fr;gap:16px}
.keys{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.keys button{border:0;background:var(--key);color:#f3f4f5;border-radius:8px;padding:12px 0;font-size:1.05rem;font-weight:600;cursor:pointer;touch-action:manipulation;box-shadow:inset 0 -3px 0 rgba(0,0,0,.35)}
.keys button:hover{background:var(--key-hi)}
.keys button:active{transform:translateY(1px);box-shadow:inset 0 -1px 0 rgba(0,0,0,.35)}
.keys button.op{background:#555c64}
.keys button[data-k="' "],.keys button[data-k='" ']{background:var(--tape);color:#1c1e20}
.keys button.eq{background:var(--tape);color:#1c1e20;font-weight:800}
table.units{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
.units th,.units td{border-bottom:1px solid var(--line);padding:7px 6px;text-align:left;font-weight:400;vertical-align:top}
.units td{text-align:right;white-space:nowrap;font-weight:600}
.units tr.key th,.units tr.key td{font-weight:700;background:var(--tape-soft)}
.units thead th{font-weight:700;color:var(--muted);font-size:.9rem}
.device .units th,.device .units td{border-color:#41474e;color:#d9dcdf}
.device .units tr.key th,.device .units tr.key td{background:rgba(242,183,5,.16);color:#fff}
.marks .units td{text-align:left;font-weight:400}
.prec{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:.92rem;color:var(--muted)}.prec select{width:auto;padding:5px 8px}
.device .prec{color:#aab0b6}.device .prec select{background:var(--key);border-color:#555c64;color:#fff}
.tapehead{display:flex;justify-content:space-between;margin-top:16px;padding-top:10px;border-top:1px solid var(--line)}
.device .tapehead{border-color:#41474e;color:#aab0b6}
.tape{list-style:none;margin:6px 0 0;padding:0;max-height:200px;overflow:auto}
.device .tape{background:#fbfaf6;color:var(--ink);border-radius:4px;padding:0 10px}
.device .tape:empty{display:none}
.tape button{display:flex;justify-content:space-between;gap:12px;width:100%;background:none;border:0;border-bottom:1px dashed #d6d3cb;padding:6px 2px;cursor:pointer;text-align:left;font-variant-numeric:tabular-nums}
.tape button span{color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.muted{color:var(--muted)}
.form{display:grid;grid-template-columns:1fr 1fr;gap:12px 16px;margin-bottom:6px}
.form label{display:block;font-size:.92rem;font-weight:700}
.form input,.form select{margin-top:4px;font-weight:400}
ul.warn{margin:12px 0 0;padding:0;list-style:none}
ul.warn li{background:var(--warn-bg);color:var(--warn);border-radius:6px;padding:8px 10px;margin-bottom:6px;font-size:.92rem}
.diagram svg{width:100%;height:auto;display:block}
.diagram text{font:12px "Archivo",system-ui,sans-serif;fill:var(--muted)}
.diagram .raft{stroke:var(--tape-dk);stroke-width:5;stroke-linecap:round}
.diagram .dim{stroke:#9b998f;stroke-width:1.2;stroke-dasharray:4 4}
.diagram .wall{fill:#d9d5cc}
details.marks{margin-top:16px}details.marks summary{cursor:pointer;font-weight:700}
footer.site{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
footer.site .wrap{display:flex;gap:16px;flex-wrap:wrap;padding:22px 20px}
@media (max-width:900px){.hero{grid-template-columns:1fr;gap:20px}.hero-text{padding-top:0}}
@media (max-width:720px){.grid2,.form{grid-template-columns:1fr}.tool{padding:14px}.tool.device{padding:16px 12px 12px;border-radius:18px}main{padding:16px 16px 48px}nav.main{gap:14px}}
/* Pro waitlist box (E29) */.pro{margin:34px auto 6px;padding:18px 20px;border:1px solid var(--line);border-top:6px solid var(--tape);border-radius:6px;background:#fff}.pro-tag{margin:0;font-size:.85rem;font-weight:700;color:var(--muted)}.pro-lead{font-size:1.35rem;font-weight:800;letter-spacing:-.02em;line-height:1.2;margin:.15em 0 .45em}.pro ul{margin:0 0 14px;padding-left:1.15em}.pro-price span,.pro-free{color:var(--muted)}.pro-btn,.pro-send,.pro-close{border:0;border-radius:6px;padding:10px 18px;font-weight:700;cursor:pointer;background:var(--tape);color:var(--ink)}.pro-btn:hover,.pro-send:hover{background:var(--tape-dk)}.pro-close{background:#fff;box-shadow:inset 0 0 0 1.5px var(--line)}.pro-dlg{border-radius:6px;border-top:6px solid var(--tape)}.pro-buy{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px}.pro-price{margin:0}.pro-price b{font-size:1.1rem}.pro-price span{font-size:.92rem}.pro-free{font-size:.9rem;margin:12px 0 0}.pro-dlg{max-width:430px;width:calc(100% - 32px);padding:0;border:1px solid var(--line);color:inherit;background:#fff}.pro-dlg::backdrop{background:rgba(20,22,25,.4)}.pro-dlg-in{padding:20px 22px}.pro-dlg-in p{margin:0 0 .7em}.pro-dlg-h{font-weight:700;font-size:1.2rem}.pro-dlg-l{display:block;font-size:.9rem;font-weight:600;margin:.4em 0 4px}.pro-dlg input{width:100%;box-sizing:border-box;padding:9px 11px;border:1px solid var(--line);border-radius:6px;font:inherit;background:#fff}.pro-dlg-a{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.pro-dlg-ok{margin-top:12px!important;font-weight:600}@media print{.pro,.pro-dlg{display:none!important}}