/* Native MathML: no external scripts, fonts or network services. */
.equation-board{margin:58px 0 26px;scroll-margin-top:24px}
.equation-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;border-top:1px solid #3d6079;padding-top:30px}
.equation-heading h2{font-size:34px;margin:8px 0 0}
.equation-heading>a{font-size:13px;flex-shrink:0;padding-bottom:5px}
.equation-heading .eyebrow{margin:0}
.equation-intro{color:#b2c8db;max-width:820px;font-size:15px;line-height:1.65;margin:14px 0 25px}
.equation-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start}
.equation-card{min-width:0;border:1px solid #35536b;background:linear-gradient(135deg,#143248,#0d2337);border-radius:16px;padding:23px 25px}
.equation-card h3{font:550 15px/1.4 Lab,'Segoe UI',sans-serif;letter-spacing:.01em;color:#95e3d8;margin:0 0 15px}
.equation-card>p{color:#b7cddd;font-size:14px;line-height:1.65;margin:16px 0 0;max-width:65ch}
.equation-scroll{overflow-x:auto;overflow-y:hidden;scrollbar-width:thin;scrollbar-color:#577c91 #10283d;max-width:100%;padding:8px 4px 12px;border-top:1px solid #29475f;border-bottom:1px solid #29475f}
.equation-board math{font-family:'Cambria Math','STIX Two Math','Latin Modern Math',math;font-weight:400;color:#edf6fc;letter-spacing:normal;line-height:normal}
.equation-scroll math{font-size:25px;margin:15px auto;width:max-content;min-width:min-content}
.equation-scroll mtext{font-size:.88em}
.equation-scroll[data-overflow=true]::after{content:'Scroll sideways ↔ · or focus here and use arrow keys';display:block;position:sticky;left:0;max-width:100%;font:11px/1.5 Lab,'Segoe UI',sans-serif;color:#9dc8d5;margin-top:10px;white-space:normal}
.equation-key{margin-top:17px}
.equation-key summary{color:#86cfcf;cursor:pointer;font-size:12px;letter-spacing:.025em;padding:4px 0;list-style-position:outside;margin-left:13px}
.equation-key dl{margin:14px 0 0;border-top:1px solid #29475f}
.equation-key dl>div{display:grid;grid-template-columns:105px minmax(0,1fr);gap:14px;padding:10px 0;border-bottom:1px solid #29475f}
.equation-key dt{align-self:center;overflow-wrap:anywhere}
.equation-key dt math{font-size:19px}
.equation-key dd{margin:0;font-size:12px;line-height:1.55;color:#acc5d7}
.equation-footnote{font-size:12px;color:#93afc4;max-width:960px;line-height:1.65;margin:18px 0}
@media(max-width:1040px){.equation-grid{grid-template-columns:1fr}.equation-scroll math{font-size:25px}}
@media(max-width:560px){.equation-card{padding:18px 15px}.equation-heading{align-items:start;flex-direction:column;gap:12px}.equation-heading h2{font-size:29px}.equation-scroll math{font-size:21px}.equation-key dl>div{grid-template-columns:85px minmax(0,1fr);gap:10px}.equation-intro{font-size:14px}.equation-key dt math{font-size:17px}}
@media print{.equation-grid{display:block}.equation-card{break-inside:avoid;background:white;border:1px solid #aaa;margin:15px 0}.equation-board math,.equation-card>p,.equation-card h3,.equation-key dd{color:black}.equation-scroll{overflow:visible}.equation-key::details-content{content-visibility:visible}}