:root{--ink:#203747;--muted:#768893;--blue:#176b98;--blue-dark:#155879;--line:#dce5eb;--paper:#fff;--surface:#f5f8fb;--mint:#247c68;--font:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--surface);color:var(--ink);font:15px/1.5 var(--font);-webkit-font-smoothing:antialiased}.header{height:90px;max-width:1440px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:0 64px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:10px;align-items:center;color:var(--ink);text-decoration:none;font-size:21px;letter-spacing:-.5px}.brand svg{width:34px;height:34px;fill:var(--blue)}.brand strong{font-weight:650}.beta{font-size:9px;letter-spacing:1.2px;font-weight:700;background:#e1ebf1;padding:3px 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strong{display:block;font-size:16px;font-weight:550;color:#3e6074;margin-top:3px}.sheet-download{margin-top:18px;width:100%}.result-note{font-size:11px;line-height:1.7;color:#8a9daa;text-align:center;max-width:660px;margin:22px auto 0}footer{max-width:1140px;margin:68px auto 0;border-top:1px solid var(--line);padding:23px 0 35px;display:flex;justify-content:space-between;font-size:10px;color:#8a9eaa}footer>span:first-child{font-weight:600;color:#648093}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:100;background:#273e4d;color:white;padding:15px 22px;border-radius:10px;box-shadow:0 6px 30px #0002;font-size:13px;max-width:min(600px,calc(100vw - 30px));line-height:1.6}dialog{border:1px solid var(--line);border-radius:15px;padding:30px;max-width:460px;color:var(--ink);box-shadow:0 15px 70px #183b5030}dialog::backdrop{background:#1a3c5060;backdrop-filter:blur(4px)}dialog p{font-size:13px;line-height:1.8;color:#78909f;margin:16px 0 25px}dialog>div{display:flex;gap:10px;justify-content:flex-end}input:focus,select:focus{border-color:#519bc1;box-shadow:0 0 0 3px #317ea217}button:focus-visible,a:focus-visible{outline:3px solid #77b4d3;outline-offset:4px}[hidden]{display:none!important}@keyframes spin{to{transform:rotate(360deg)}}@keyframes flow{to{background-position:50px 0}}@media(min-width:1500px){main{max-width:1260px}.workspace{grid-template-columns:minmax(0,1fr) 330px}.part-image{height:185px}}@media(max-width:1050px){.header{padding:0 30px}.header-note{display:none}.workspace{gap:22px;grid-template-columns:minmax(0,1fr) 290px}.settings-panel{padding:20px}.parts-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.intro-note{margin-right:0}.quantity-control input{width:40px}footer{margin-left:30px;margin-right:30px}.steps{gap:12px}}@media(max-width:740px){.header{height:73px;padding:0 20px}.brand{font-size:18px}.brand svg{width:29px;height:29px}.brand .beta{display:none}.header .button{font-size:10px;padding:7px 9px}main{padding:0 20px}.intro{padding:35px 0 29px}.intro h1{font-size:39px;letter-spacing:-1.5px}.intro-note{display:none}.lead{font-size:13px}.steps{gap:7px;font-size:9px;margin-bottom:18px}.steps b{font-size:9px;margin-right:4px}.steps>span{min-width:10px}.dropzone{height:200px}.drop-title{font-size:16px}.drop-subtitle{font-size:12px}.drop-limits{font-size:10px}.workspace{grid-template-columns:1fr;gap:25px}.settings-panel{position:static;padding:23px}.parts-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.part-image{height:165px}.settings-panel h2{margin-bottom:15px}.calculation{padding:23px}.progress-heading h2{font-size:18px}.progress-heading .button{font-size:10px;padding:8px 10px}.progress-line{font-size:11px}.optimization{gap:22px}.results{padding-top:35px}.result-heading h2{font-size:26px}.result-heading{align-items:start;flex-direction:column}.result-heading .button{width:100%}.sheets-grid{grid-template-columns:1fr;gap:20px}.sheet-stats{font-size:10px}.sheet-stats strong{font-size:15px}footer{margin:40px 20px 0;padding-bottom:25px;gap:12px;flex-wrap:wrap}footer>span:nth-child(2){display:none}footer>span:last-child{font-size:9px}.problem-heading{align-items:start;gap:10px}.problem-heading>span{max-width:90px;text-align:right}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

@media(max-width:740px){.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.steps a{white-space:normal;line-height:1.5}.steps>span{display:none}}

.part-warnings{font-size:10px;color:#8f7952;margin-top:8px}.part-warnings summary{cursor:pointer}.part-warnings p{margin:5px 0;line-height:1.6}

.file-guide{padding:18px 22px;margin:0 0 16px;border:1px solid var(--line);border-radius:12px;background:var(--paper);font-size:14px;line-height:1.6}.file-guide strong{font-size:16px;font-weight:650}.file-guide p{margin:6px 0 0;color:#536d7d}@media(max-width:740px){.file-guide{padding:16px;font-size:13px}.file-guide strong{font-size:15px}}

.language-picker{display:flex;align-items:center;gap:6px}.language-picker select{font:inherit;font-size:12px;background:white;border:1px solid var(--line);border-radius:7px;padding:7px;max-width:165px;color:var(--ink)}.part-name{unicode-bidi:plaintext}input[type=number],.part-number,.sheet-stats strong{direction:ltr;unicode-bidi:isolate}html[dir=rtl] .intro-note{border-left:0;border-right:1px solid var(--line);padding-left:0;padding-right:35px;margin-left:15px;margin-right:0}html[dir=rtl] .remove-part{right:auto;left:10px}html[dir=rtl] .part-warnings{text-align:right}@media(max-width:740px){.header{height:auto;min-height:85px;padding-top:14px;padding-bottom:14px;gap:14px;flex-wrap:wrap}.header-right{gap:10px;flex-wrap:wrap}.language-picker select{max-width:140px}.progress-line{flex-wrap:wrap;gap:8px}.file-guide,.lead,.field-help,.drop-subtitle{overflow-wrap:anywhere}.steps a{overflow-wrap:anywhere}}

.contact-header{color:var(--blue);text-decoration:none;font-size:23px;line-height:1;padding:7px;border-radius:6px}.contact-header:hover{background:#e1ebf1}.contact-header:focus-visible,.contact-link:focus-visible{outline:2px solid var(--blue);outline-offset:4px}.contact-link{display:flex;flex-wrap:wrap;gap:4px 10px;color:var(--blue);text-decoration:none}.contact-link:hover{text-decoration:underline}.contact-link bdi{white-space:nowrap}

.metrika-pixel{position:absolute;left:-9999px}.feedback{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:24px}.feedback[hidden]{display:none}

.saved-sizes{margin-top:9px}.saved-size-note{font-size:10px;color:var(--muted)}.saved-size-list{display:flex;flex-wrap:wrap;gap:6px;max-height:132px;overflow-y:auto;padding:5px 2px}.saved-size{display:flex;max-width:100%;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--surface);direction:ltr;unicode-bidi:isolate}.saved-size button{border:0;background:transparent;color:var(--blue);font:inherit;font-size:11px;padding:5px 7px;cursor:pointer}.saved-size button:hover{background:#deecf4}.saved-size .size-remove{border-left:1px solid var(--line);font-size:16px;line-height:1;min-width:27px;color:#8d665a}

.intro h1{max-width:690px}.about-nesting{margin-top:58px;padding-top:30px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:38px}.about-nesting h2{font-size:22px;line-height:1.3;margin-bottom:16px}.about-nesting p{color:var(--muted);font-size:13px;line-height:1.8}.about-nesting img{width:100%;height:auto;border:1px solid var(--line);border-radius:10px}.faq details{border-bottom:1px solid var(--line);padding:14px 0}.faq summary{font-size:13px;cursor:pointer;font-weight:600}.site-languages{display:flex;flex-wrap:wrap;gap:9px 17px;margin-top:30px;font-size:12px}.site-languages a{color:var(--blue);text-decoration:none}.site-languages a[aria-current=page]{font-weight:700;text-decoration:underline}@media(max-width:740px){.about-nesting{grid-template-columns:1fr;gap:24px}.intro h1{font-size:35px;overflow-wrap:anywhere}}