*{box-sizing:border-box}[hidden]{display:none!important}
:root{--ink:#131d40;--blue:#264cdb;--paper:#f5f5f0;--line:#aab4ce;font-family:"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.45}body,h1,h2,p{margin:0}header{height:68px;display:flex;justify-content:space-between;align-items:center;padding:0 4%;border-bottom:1px solid var(--line);background:#fff}.brand{color:inherit;text-decoration:none;font-weight:850;font-size:24px;letter-spacing:-.06em;display:flex;gap:10px;align-items:center}.brand span{width:22px;height:23px;background:repeating-linear-gradient(90deg,var(--ink) 0 3px,transparent 3px 6px);transform:skew(-10deg)}nav{display:flex;gap:18px;align-items:center}a{color:inherit;text-underline-offset:4px}
button,input{font:inherit;color:inherit}button{background:#fff;border:1px solid #8898bc;min-height:44px;padding:7px 12px;font-weight:650;cursor:pointer;border-radius:3px}button:disabled{opacity:.52;cursor:default}button:hover:not(:disabled){border-color:var(--blue);box-shadow:inset 0 0 0 1px var(--blue)}button[aria-pressed=true],.solid{background:var(--blue);color:white;border-color:var(--blue)}:focus-visible{outline:3px solid #dd551e;outline-offset:3px}
main{width:min(1200px,calc(100% - 64px));margin:auto}.bench{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:25px;padding-top:28px}.viewer,aside{min-width:0}.stage-head,.strip-head,.transport{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.stage-head{justify-content:space-between;margin-bottom:13px}h1{font-size:clamp(29px,4.2vw,58px);line-height:1.05;letter-spacing:-.07em}.stage-head p{margin-top:6px;color:#465374}.proof{padding:16px;background:#e1e7ff;border:1px solid var(--line);background-image:radial-gradient(#9daeea 1px,transparent 1px);background-size:9px 9px}.proof canvas{display:block;width:min(100%,735px);height:auto;aspect-ratio:5/3;margin-inline:auto;border:1px solid #323c64;background:#fff}.proof canvas.drawing{cursor:crosshair;touch-action:none}.transport{background:#fff;border:1px solid var(--line);border-top:0;padding:8px 12px}.transport label{font-size:14px;font-weight:650}.transport input{flex:1;min-width:95px}.transport output{white-space:nowrap;font:700 13px Consolas,monospace}
input[type=range]{accent-color:var(--blue);min-height:44px}.strip-head{margin:14px 0 7px}.strip-head h2{margin-right:auto}h2{font-size:22px;letter-spacing:-.04em}#frames{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px}#frames button{padding:4px;min-width:0;display:grid;gap:3px;text-align:left}#frames canvas{width:100%;display:block;aspect-ratio:5/3}#frames span{font:700 12px Consolas,monospace}
aside{border-left:1px solid var(--line);padding-left:19px;margin-top:7px}aside h2{margin-bottom:9px}.mode,.frame-tools,.downloads{display:flex;gap:6px;flex-wrap:wrap}.mode button,.frame-tools button{font-size:13px}.frame-tools{padding-top:13px;border-top:1px solid var(--line);margin-top:13px}.frame-tools button{flex:1 1 90px}#optical,#drawing{display:grid;gap:5px;margin-top:16px}#optical p{font-size:13px;color:#465374}#slit-info{float:right;font-weight:700}input[type=color]{min-height:44px;width:100%;background:white;border:1px solid var(--line)}#message{font-size:14px;margin-top:10px;color:#3c4f8b}
#guide{max-width:78ch;margin:31px 0;padding:19px 0 27px;border-top:1px solid var(--line)}#guide ol{padding-left:24px}.downloads{margin-top:13px}#printout{display:none}
@media(max-width:860px){.bench{grid-template-columns:1fr;gap:18px}aside{border-left:0;border-top:1px solid var(--line);padding:14px 0 0}.proof canvas{max-height:none}}
@media(max-width:500px){main{width:calc(100% - 24px)}header{height:57px;padding:0 12px}.brand{font-size:20px}.brand span{width:17px;height:18px}nav{gap:9px}nav a,nav button{font-size:13px}.bench{padding-top:15px}.proof{padding:8px}.transport{padding:5px;gap:6px}.transport button,.transport label,.strip-head button{font-size:12px}.transport input{min-width:50px}.strip-head h2{font-size:18px}#frames{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media print{@page{size:A4;margin:18mm}body{background:#fff;color:#000}header,main{display:none}#printout{display:block}#printout section+section{break-before:page}#printout img{display:block;width:120mm;height:72mm;margin:7mm 0 12mm}#printout i{display:block;border-top:1px solid black;width:50mm}#printout p{font-size:10pt}#printout h2{font-size:15pt}}