:root{color-scheme:light;--paper:#fffefa;--ink:#294252;--muted:#687883;--rule:#deded6;--blue:#347b99;--green:#32816e;--purple:#785697;--gold:#ad7736}
*{box-sizing:border-box}
body{margin:0;background:#f2f0eb;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
main{max-width:1320px;margin:auto;padding:32px 36px 24px}
a{color:#326f89;text-decoration:none}a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid #347b99;outline-offset:5px;border-radius:4px}
.skip-link{position:absolute;top:12px;left:20px;padding:10px 14px;background:var(--paper);transform:translateY(-160%);z-index:2}.skip-link:focus{transform:none}
.page-head{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-bottom:24px;border-bottom:1px solid var(--rule)}
.eyebrow{font-size:10px;letter-spacing:1.3px;color:var(--muted);margin:0 0 10px}
h1,h2{font-family:Palatino,"Palatino Linotype",Georgia,serif;font-weight:400}
h1{font-size:clamp(34px,4vw,49px);line-height:1.08;margin:0}
.page-head nav{display:flex;gap:24px;font-size:12px;flex-wrap:wrap}
.tabs{display:flex;gap:8px;padding:23px 0 20px}
.tabs button{font:inherit;font-size:14px;border:1px solid var(--rule);border-radius:999px;padding:11px 24px;background:var(--paper);color:var(--muted);cursor:pointer}
.tabs button[aria-selected="true"]{background:#294f63;border-color:#294f63;color:white}.tabs button:hover{border-color:#7894a3}
.view-panel{padding:24px 28px 17px;background:var(--paper);border:1px solid var(--rule);border-radius:15px}.view-panel[hidden]{display:none}
.view-head{display:flex;justify-content:space-between;gap:24px;align-items:center;margin-bottom:15px}
h2{font-size:clamp(26px,2.6vw,35px);line-height:1.15;margin:0 0 7px}.view-head p{font-size:13px;color:var(--muted);margin:0;line-height:1.5}
.sheet-links{display:flex;gap:22px;font-size:12px;white-space:nowrap}
figure{margin:0;min-width:0}.diagram-stage{width:100%;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-color:#c4d1d5 transparent}.diagram-stage img{display:block;width:100%;height:auto}
figcaption{padding-top:13px;border-top:1px solid var(--rule);color:var(--muted);font-size:12px;line-height:1.65}.mobile-help{display:none}
footer{display:flex;gap:16px;justify-content:space-between;padding-top:20px;font-size:11px;line-height:1.5;color:var(--muted)}footer strong{font-weight:500;color:#765f41}
@media(max-width:850px){main{padding:24px 20px}.view-panel{padding:22px 18px 15px}.page-head{align-items:flex-start}.page-head nav{gap:12px;flex-direction:column}.view-head{align-items:flex-start;gap:15px}.sheet-links{gap:12px;flex-direction:column}.diagram-stage img{min-width:740px}.mobile-help{display:inline-block;margin-left:12px;color:#326f89}}
@media(max-width:480px){main{padding:21px 12px}.page-head{gap:12px}.eyebrow{font-size:8px;letter-spacing:.8px;max-width:230px}.page-head nav{font-size:10px;gap:14px}.tabs{gap:6px;padding:20px 0 16px}.tabs button{padding:10px 17px;font-size:12px}.view-panel{border-radius:11px;padding:21px 14px 14px}.view-head{display:block}.sheet-links{flex-direction:row;margin-top:12px;gap:20px}.view-head p{font-size:12px}footer{display:block;font-size:10px}footer span{display:block;margin-top:5px}figcaption{font-size:11px}}
@media(prefers-reduced-motion:no-preference){.tabs button{transition:background-color .15s,border-color .15s}}
@media print{body{background:white}main{padding:0}.page-head nav,.tabs,.sheet-links,.mobile-help{display:none}.view-panel{border:0;padding:15px 0}.view-panel[hidden]{display:block;break-before:page}.diagram-stage{overflow:visible}.diagram-stage img{min-width:0}.view-head{margin-bottom:5px}footer{margin-top:10px}}