:root{--background:#fff;--foreground:#17374d;--muted-foreground:#536773;--border:#d3dee5;--green:#217e60;--orange:#c66b23;--blue:#287ca8;--purple:#8458a4;--g-metal:#e9eff3;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--foreground);background:#eff3f6;font-size:16px;line-height:1.65;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button,a,summary,select{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #d5782e;outline-offset:4px}button:disabled{cursor:default}h1,h2,h3,p{margin:0}h1{font-size:clamp(21px,2.4vw,32px);line-height:1.35;letter-spacing:-.035em}h1 span{font-weight:400;margin-left:12px}h2{font-size:22px;line-height:1.4}a{color:#176b9d;text-underline-offset:4px}header{max-width:1360px;margin:auto;padding:28px 36px;display:flex;gap:16px;align-items:center}.brand-mark{width:48px;height:48px;border-radius:8px;background:#17374d;color:white;display:grid;place-items:center;font-size:29px;font-weight:750;border-bottom:5px solid #d5782e;flex-shrink:0}.eyebrow{font-size:13px;letter-spacing:.04em;color:#536773;font-weight:650;margin-bottom:6px}.share{margin-left:auto;border:1px solid #9fb2bf;border-radius:6px;background:transparent;color:#17374d;padding:9px 14px;white-space:nowrap;font-size:14px}main{max-width:1360px;margin:auto;padding:0 36px}.context{display:flex;gap:15px;align-items:baseline;border-top:1px solid #c9d6df;padding:18px 0}.context strong{flex-shrink:0;color:#a75416;font-size:14px}.context p{font-size:15px}.device-nav{display:flex;gap:6px;overflow-x:auto;padding:0 0 16px;scrollbar-width:thin}.device-nav button{display:flex;gap:9px;flex:1;justify-content:center;align-items:center;background:#fff;border:1px solid #d2dee5;border-radius:6px;color:#344f60;padding:11px 12px;white-space:nowrap;font-size:15px}.device-nav button span{font-size:12px;color:#718491;font-variant-numeric:tabular-nums}.device-nav button[aria-pressed=true]{background:#17374d;color:white;border-color:#17374d}.device-nav button[aria-pressed=true] span{color:#e6a567}.workbench{display:grid;grid-template-columns:minmax(0,1.85fr) minmax(300px,1fr);background:white;border:1px solid #d2dee5;border-radius:10px;overflow:hidden}.diagram-panel{padding:24px;min-width:0}.panel-title{font-size:17px;margin-bottom:14px}.viz-controls{display:flex;flex-wrap:wrap;gap:14px;align-items:end}.form-label{display:grid;gap:4px;font-size:13px;color:#536773}.form-select{width:100%;max-width:390px;min-height:42px;padding:6px 26px 6px 10px;border:1px solid #b9cbd6;border-radius:5px;background:#fff;color:#17374d;font-size:15px}.viz-row{display:flex;flex-wrap:wrap;gap:8px}.btn{border:1px solid #b9cbd6;border-radius:5px;background:#fff;color:#17374d;padding:7px 10px;min-height:40px;font-size:14px}.btn[aria-pressed=true]{border-color:#17374d;background:#e9eff3}.btn:hover,.share:hover{background:#e9eff3}.text-small{font-size:14px}.text-muted,.muted{color:#586e7b}#gypsum-scene{background:#fff;min-height:190px}#gypsum-selected-detail{font-size:16px;line-height:1.8;padding-top:16px;border-top:1px solid #dbe3e9}#gypsum-legend{gap:9px 15px}#gypsum-dimensions{padding:14px;border-left:3px solid #c66b23;background:#f8f4ed}#gypsum-dimensions .viz-row{font-weight:650;gap:6px 20px}.sources{border-top:1px solid #e3e9ed;padding-top:13px}.sources summary{cursor:pointer;color:#536773}.sources p{margin:10px 0}.sources a{display:inline-block;margin:4px 0}.explanation{padding:28px 28px 24px;background:#f8fafb;border-left:1px solid #d2dee5}.explanation .lead{font-size:16px;color:#385364;margin:16px 0 24px}.guide-block{margin-top:20px}.guide-block h3{font-size:15px;margin-bottom:7px;display:flex;align-items:center;gap:8px}.guide-block 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form{margin-top:18px;text-align:right}@media(min-width:1100px){.form-select{max-width:295px}}@media(max-width:900px){header{padding:22px}.brand-mark{display:none}main{padding:0 22px}.workbench{grid-template-columns:1fr}.explanation{border-left:0;border-top:1px solid #d2dee5;display:block}.principles{gap:28px}.device-nav button{flex:none}h1 span{display:block;margin:3px 0 0;font-size:.7em;letter-spacing:0}}@media(max-width:540px){header{padding:19px 16px;align-items:center;gap:10px}main{padding:0 12px}.eyebrow{font-size:12px}h1{font-size:23px}.share{padding:8px;font-size:13px}.context{gap:10px;align-items:start;padding:14px 3px}.context p{font-size:14px;line-height:1.7}.device-nav{margin-right:-12px;padding-right:12px}.device-nav button{font-size:14px;padding:9px 11px}.diagram-panel{padding:18px 12px}.panel-title{font-size:16px}.viz-controls{gap:12px;display:block}.form-label{font-size:14px}.form-select{max-width:none;font-size:16px;min-height:46px}.viz-row#gypsum-mode-controls{margin-top:12px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:5px}.btn{font-size:14px;padding:7px 5px}.text-small{font-size:14px}.explanation{padding:23px 20px}.explanation h2{font-size:22px}.guide-block p,.guide-block li{font-size:16px}.principles{grid-template-columns:1fr;gap:28px;margin:30px 5px}.principles h2{font-size:21px}.download-panel{padding:22px 20px;display:block}.download{margin-top:18px;justify-content:space-between;width:100%;white-space:normal}footer{padding-inline:6px}#gypsum-mobile-labels{font-size:14px;line-height:1.7;gap:9px!important}#gypsum-legend{font-size:13px}#share-status:not(:empty){white-space:normal;text-align:center;width:max-content;max-width:90vw}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}