/* Shared editorial language with the XPower Academy: ink, paper, ochre, evidence. */
.foundation-frame{padding:0!important;gap:0!important;align-items:stretch!important}.foundation-frame .foundation-copy>p{color:#d2dce5}.foundation-frame .foundation-copy>.small{color:#d1bc94}.foundation-frame blockquote{color:#f3d6a2}.foundation-frame figcaption{padding:12px 18px;margin-top:0}.foundation-frame img{border-radius:0}
:root{--blue:#173d58;--action:#1d607b;--ink:#152a3b;--muted:#526779;--line:#d9e2e9;--wash:#eef3f7;--paper:#fbfcfd;--accent:#dfb96e;--radius:6px;font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:17px}body{background:var(--paper)}h1,h2{font-family:Georgia,'Times New Roman',serif;font-weight:400;letter-spacing:-.035em}h1{font-size:clamp(2.5rem,4.5vw,4.3rem);max-width:1000px;line-height:1.1}h2{font-size:clamp(1.8rem,3vw,2.5rem)}h3{font-weight:650;letter-spacing:-.02em}.masthead{max-width:none;background:#0b1c2e;color:#f6f8fa;padding:24px max(28px,calc((100vw - 1240px)/2));border-bottom:1px solid #ffffff18}.brand-mark{color:#e8c17c}.brand-mark span{color:#e8c17c}.brand small{color:#a6b8c9;font-size:.76rem;letter-spacing:.06em}.brand b{font-size:1.2rem;font-weight:600}.languages{border-color:#4b5a6c;border-radius:4px}.languages a{color:#cad8e5;font-size:.82rem;padding:9px 11px}.languages a[aria-pressed=true]{background:#e5bf78;color:#152a3b}.main-nav{max-width:none;padding:0 max(28px,calc((100vw - 1240px)/2));gap:22px;background:#0b1c2e;border-bottom:1px solid #23384a;justify-content:space-between;flex-wrap:wrap}.main-nav a{color:#b4c3d2;font-size:.86rem;padding:18px 0;gap:7px;white-space:nowrap}.main-nav a[aria-current=page]{color:#f1d7a5;border-color:#dfb96e;font-weight:500}.main-nav a span{color:#caaa72;font-size:.7rem}main{max-width:1336px;padding-top:46px}.intro{margin-bottom:36px}.intro p{font-size:1.1rem;line-height:1.75;max-width:780px}.eyebrow{font-size:.76rem;letter-spacing:.13em}.edition{font-size:.76rem;max-width:150px}.foundation-frame{border:0!important;background:#10283c!important;color:#fff;margin-bottom:32px!important;border-radius:6px!important;overflow:hidden;grid-template-columns:1.05fr 1fr!important}.foundation-frame figure img{height:100%;min-height:360px;object-fit:cover}.foundation-frame figcaption{background:#10283c!important;color:#c4d3de!important;font-size:.76rem}.foundation-copy{padding:36px!important}.foundation-copy .eyebrow,.foundation-copy .small{color:#d1bc94}.foundation-copy h2{font-size:2.2rem}.foundation-copy blockquote{font-family:Georgia,serif;font-size:1.4rem;line-height:1.45;border:0;padding:0;margin:20px 0}.foundation-copy p{color:#d2dce5}.foundation-copy .btn{background:#e5bf78;color:#112a3c}.foundation-copy .btn.secondary{background:transparent;color:#e4edf4;border-color:#6e8597}.voice-note{max-width:920px;margin:32px 0;padding:18px 0 18px 26px;border-left:3px solid #c39242}.voice-note blockquote{font:400 clamp(1.3rem,2.2vw,1.65rem)/1.5 Georgia,serif;margin:0;color:#28475c}.voice-note p{font-size:.76rem;margin:12px 0 0;color:var(--muted)}.section{margin-top:58px}.three{gap:25px}.panel{background:white;border-color:#d9e2e9;border-radius:6px}.formula{background:#173449;margin:34px 0}.formula .n{color:#d3b57e}.formula strong{font:400 1.6rem Georgia,serif}.formula p{color:#dce5ed}.lesson-layout{border-radius:6px;background:white}.lesson-menu{background:#eef3f6}.lesson-menu a{font-size:.95rem;padding:17px 13px;line-height:1.45}.lesson-menu a[aria-current=page]{background:#fff;border-left:3px solid #be8d3e}.lesson{padding:36px 42px;line-height:1.78}.lesson h3{font:400 1.95rem/1.2 Georgia,serif}.lesson h4{margin:28px 0 10px;font-size:1rem}.lesson p{max-width:78ch}.takeaway{background:#edf3f6;border-left-color:#be8d3e}.material-reader>summary{padding:25px 18px}.material-title{font-family:Georgia,serif;font-size:1.45rem;font-weight:400}.material-reader>summary::after{color:#ac7831}.material-body{max-width:1040px;line-height:1.8}.material-reader[open]>summary{background:#edf3f7}summary{font-size:1rem;min-height:34px}button,.btn{border-radius:5px}.btn{background:#173d58;font-size:.91rem}.text-button{line-height:1.5}.source-links{font-size:.82rem}.small{font-size:.82rem;line-height:1.7}.check input{min-height:20px}.field label{font-size:.85rem}.connections .actions a{font-size:.82rem}.connections h2{font-family:inherit;font-size:1.1rem}.light-interactive{background:#10283c;color:#ecf2f6;border-radius:6px;padding:34px;margin:36px 0;overflow:hidden}.light-interactive h2{color:#fff;margin-bottom:15px}.light-interactive p{color:#c4d3df;max-width:900px}.light-interactive .eyebrow{color:#e3c186;font-size:.73rem}.interactive-head{display:grid;grid-template-columns:1fr auto;gap:32px;align-items:center}.interactive-head output{font:400 clamp(2.5rem,6vw,4.3rem)/1 Georgia,serif;color:#efca84;font-variant-numeric:tabular-nums}.rhythm-layout{display:grid;grid-template-columns:1.7fr 1fr;gap:35px;margin-top:24px;align-items:center}.rhythm-layout svg{display:block;width:100%;color:#f5deb5;overflow:visible}.rhythm-layout svg text{fill:#bccbd8;font:13px system-ui,sans-serif}.rhythm-fill{fill:#e5bf781a}.rhythm-line{stroke:#eac582;stroke-width:3;fill:none}.fixed-line{stroke:#7b98b0;stroke-width:2;stroke-dasharray:6 6}.time-cursor{stroke:#fbebcd;stroke-width:1.5}.chart-axis-label,.chart-legend{font-size:.74rem;color:#bdcedd}.chart-legend{display:flex;gap:14px;flex-wrap:wrap;margin:18px 0}.chart-legend span::before{content:'';display:inline-block;width:18px;border-top:3px solid #eac582;margin-right:8px;vertical-align:middle}.chart-legend .legend-flat::before{border-color:#7b98b0;border-top-style:dashed}.range-label{display:block;font-size:.84rem;color:#dae5ec}input[type=range]{accent-color:#dfb96e;padding:0;border:0;min-height:38px;background:transparent;cursor:ew-resize}.scene-buttons{display:flex;gap:7px;flex-wrap:wrap;margin-top:8px}.scene-buttons button,.loop-steps button{background:#1b3b53;border:1px solid #557188;color:#d7e4ed;padding:10px 14px;font-size:.85rem;min-height:44px}.scene-buttons button[aria-pressed=true],.loop-steps button[aria-pressed=true]{background:#e5bf78;color:#152a3b;border-color:#e5bf78}.scene-note{border-left:1px solid #496173;padding:16px 0 16px 27px}.scene-note>span{font:400 2rem Georgia,serif;color:#f1ce8f}.scene-note p{margin-top:18px;font-size:1rem;line-height:1.75}.interactive-footnote{font-size:.78rem!important;color:#aabed0!important;margin:22px 0 0!important}.loop-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:27px 0}.loop-steps button{font-size:1.15rem;text-align:left;display:flex;align-items:center;gap:15px;padding:23px 20px}.loop-steps button span{font:400 1.8rem Georgia,serif;opacity:.65}.loop-explanation{display:grid;grid-template-columns:1fr 1fr;gap:30px;border-top:1px solid #415d70;padding-top:25px}.loop-explanation p{margin:0}.loop-explanation>div{border-left:1px solid #415d70;padding-left:25px}.loop-explanation .eyebrow{display:block;margin-bottom:10px}.saving-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;margin-top:26px}.saving-grid label{display:block;font-size:.85rem;color:#c4d3df}.saving-grid output{display:block;font:400 3.5rem Georgia,serif;color:#edc980;margin:16px 0}.visual-bars{display:grid;gap:22px;padding:9px 0}.visual-bar>div{display:flex;justify-content:space-between;gap:14px;font-size:.85rem;line-height:1.45;margin-bottom:8px}.visual-bar strong{font-weight:600;white-space:nowrap;font-variant-numeric:tabular-nums}.bar-track{display:block;height:12px;background:#d2dce6}.bar-track i{display:block;height:100%;background:#547991;transition:width .18s}.bar-track .bar-1{background:#c39449}.bar-track .bar-2{background:#93abbc}.bar-track .bar-3{background:#b4c1ca}.bar-track .bar-4{background:#d0b78f}.light-interactive .bar-track{background:#314b60}.light-interactive .bar-track .bar-0{background:#86a4bc}.light-interactive .bar-track .bar-1{background:#e5bf78}.saving-total{display:flex;align-items:baseline;justify-content:space-between;gap:18px;margin-top:25px;border-top:1px solid #4c6375;padding-top:18px}.saving-total>span{font-size:.85rem;color:#c4d3df}.saving-total strong{font:400 2.1rem Georgia,serif;color:#f0d298}.saving-total small{font:400 .85rem system-ui,sans-serif}.editorial-photo{margin:0;min-width:0}.editorial-photo img{display:block;width:100%;height:auto;border-radius:4px;object-fit:cover;aspect-ratio:1.5}.editorial-photo figcaption{font-size:.75rem;line-height:1.65;color:#596d7d;padding:11px 0;max-width:80ch}.editorial-photo figcaption a{display:inline;color:#345970}.gallery-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin-top:25px}.photo-with-note{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center;margin:40px 0}.photo-with-note h2{font-size:2.25rem}.engineering-questions{margin:45px 0}.engineering-questions .three{border-top:1px solid var(--line);margin-top:25px}.engineering-questions article{padding:25px 0 0}.engineering-questions h3{font:400 1.5rem/1.3 Georgia,serif}.engineering-questions p{color:var(--muted);font-size:.95rem}.rating-visual{display:grid;grid-template-columns:1fr 1.1fr;gap:45px;border:1px solid var(--line);background:white;border-radius:6px;padding:30px;margin-bottom:35px}.rating-visual h2{font-size:2rem}.rating-visual p{font-size:.9rem;color:var(--muted)}.rating-visual .bar-1{background:#a56050}.chart-heading{font-size:1rem;margin-top:30px}.tool-results{background:#eef3f7;padding:20px;border-radius:4px}.tool-results dt{font-size:.83rem;color:var(--muted)}.tool-results dd{font-family:Georgia,serif;color:#244861}.trade-choices{background:#e9f0f4}.trade-model{background:#fff}.trade-metrics{background:#10283c}.trade-metrics b{font-family:Georgia,serif;color:#eaca93}.trade-template summary{font-family:Georgia,serif;font-weight:400;font-size:1.22rem}.researcher-card{border-radius:5px}.researcher-card h2{font-family:Georgia,serif}.image-credits{font-size:.85rem}.image-credits li{margin:12px 0}.image-credits h2{font-size:1.8rem}footer{font-size:.78rem;padding-top:30px;padding-bottom:35px}#notice{z-index:50}
@media(max-width:1100px){.main-nav{gap:17px;justify-content:flex-start}.main-nav a{font-size:.82rem}.foundation-copy{padding:26px!important}.rhythm-layout{gap:24px}.loop-steps button{padding:18px 15px}}
@media(max-width:760px){.masthead{padding:20px;gap:10px}.brand b{font-size:1.02rem}.brand small{font-size:.7rem}.languages a{padding:9px 8px}.intro{margin-bottom:24px}.intro p{font-size:1rem}.foundation-frame{grid-template-columns:1fr!important}.foundation-frame figure img{min-height:0;max-height:330px;object-fit:cover}.foundation-copy{padding:26px!important}.foundation-copy h2{font-size:2rem}.gallery-grid{grid-template-columns:1fr}.photo-with-note,.rating-visual,.saving-grid,.loop-explanation{grid-template-columns:1fr;gap:24px}.photo-with-note{margin:32px 0}.light-interactive{padding:25px 21px;margin:28px 0}.interactive-head{grid-template-columns:1fr;gap:13px}.interactive-head output{font-size:2.5rem}.rhythm-layout{grid-template-columns:1fr;gap:20px}.scene-note{padding:20px 0 0;border-left:0;border-top:1px solid #496173}.scene-note>span{font-size:1.65rem}.loop-steps{gap:8px}.loop-steps button{padding:14px 10px;font-size:.84rem;flex-direction:column;align-items:flex-start;gap:8px}.loop-explanation>div{border-left:0;border-top:1px solid #415d70;padding:20px 0 0}.lesson{padding:26px 22px}.lesson h3{font-size:1.7rem}.lesson-menu a{min-width:205px;flex:0 0 205px;font-size:.88rem}.section{margin-top:40px}.material-reader>summary{padding:20px 8px}.material-title{font-size:1.2rem}.voice-note{padding-left:20px}.rating-visual{padding:24px 20px}.gallery-grid .editorial-photo{max-width:100%}.saving-total{flex-wrap:wrap}.chart-legend{font-size:.73rem}}
@media(max-width:700px){.menu-toggle{background:#10283c;color:#e8d0a3;border:1px solid #506778;margin:0;padding:13px 20px;width:100%;text-align:left;border-radius:0;font-size:.9rem}.main-nav{background:#10283c;margin:0;padding:10px 20px;gap:4px}.main-nav.is-open{display:grid}.main-nav a{font-size:.85rem;padding:12px 8px}.main-nav a[aria-current=page]{border-bottom-color:#dfb96e}main{padding:29px 20px 46px}.masthead{flex-wrap:wrap}.foundation-frame{margin-left:0;margin-right:0}h1{font-size:2.5rem;line-height:1.12}.profile-chart span{font-size:.72rem}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.light-interactive{background:white;color:black;border:1px solid #888;break-inside:avoid}.light-interactive *{color:black!important}.light-interactive svg text{fill:black}.editorial-photo{break-inside:avoid}.rhythm-line{stroke:#333}.scene-buttons,.loop-steps,input[type=range]{display:none}.gallery-grid{grid-template-columns:1fr 1fr}.rating-visual{break-inside:avoid}}
.progress-source{display:flex;justify-content:space-between;align-items:center;gap:30px;padding:24px 28px;border-left:3px solid #c39242;background:#eef3f7}.progress-source p{margin:0;max-width:760px;font-size:.93rem}.progress-source>a{font-size:.83rem;flex-shrink:0}.progress-filters{display:flex;gap:10px;flex-wrap:wrap;margin:30px 0}.progress-filters button{padding:12px 18px;background:white;color:#344e62;border:1px solid #bdcbd6;font-size:.87rem;min-height:44px}.progress-filters button[aria-pressed=true]{color:#f2d7a4;background:#173449;border-color:#173449}.progress-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:30px;margin-bottom:24px}.progress-card{background:#fff;border:1px solid #d9e2e9;border-radius:6px;overflow:hidden;min-width:0}.progress-card figure{margin:0;background:#eef2f5}.progress-card figure img{width:100%;height:340px;display:block;object-fit:contain;background:#eef2f5}.progress-card figcaption{font-size:.73rem;line-height:1.5;color:var(--muted);padding:10px 22px;background:#fbfcfd;border-bottom:1px solid var(--line)}.progress-copy{padding:27px 28px}.progress-copy h2{font-size:2rem;line-height:1.18}.progress-copy h3{font-size:.84rem;text-transform:uppercase;letter-spacing:.08em;color:#647889;margin:26px 0 10px}.progress-copy p{font-size:.95rem}.progress-copy details{padding:18px 0;border-top:1px solid var(--line)}.progress-copy summary{font-weight:500;min-height:24px}.progress-copy .source-links{margin-top:22px;font-size:.8rem}.progress-copy .progress-date{font-size:.74rem;color:#6d7f8e;margin-top:18px}.progress-next{display:flex;justify-content:space-between;gap:30px;align-items:center;background:#edf3f7;border-top:2px solid #c39242;margin:45px 0 25px;padding:28px}.progress-next h2{font-size:1.7rem}.progress-next p{max-width:760px;font-size:.94rem;margin:0}.progress-next>a{flex-shrink:0}.lab-photo{max-width:850px;margin:35px auto}.researcher-card h2{font-size:1.8rem}@media(max-width:760px){.progress-grid{grid-template-columns:1fr}.progress-source,.progress-next{display:block;padding:23px}.progress-source>a{display:inline-block;margin-top:14px}.progress-card figure img{height:300px}.progress-copy{padding:23px}.progress-copy h2{font-size:1.75rem}.progress-next>a{margin-top:22px}.progress-filters button{font-size:.83rem;padding:10px 13px}}

/* Navigation moves focus to the reading region, which needs no page-sized ring. */
#main:focus,#main:focus-visible{outline:none}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex="0"]:focus-visible{outline:2px solid #397aa4;outline-offset:3px}
.voice-note{border-left:0;background:#eef3f7;border-radius:6px;padding:24px 28px}
.progress-source,.progress-next{border:0;border-radius:6px}
.edition,.takeaway,.mission,.framework-reference,.result,.space-principle{border-color:var(--line)}
.lesson-menu a[aria-current=page]{border-left-color:transparent}
.main-nav a[aria-current=page]{border-bottom-color:#9cb5c8}
@media(max-width:760px){.voice-note{padding:22px}}
.progress-media-link{padding:24px 28px;background:#eef3f7;border-bottom:1px solid var(--line)}.progress-media-link>a{display:inline-block;font-size:1rem;line-height:1.5;padding:8px 0}.progress-media-link p{font-size:.875rem;line-height:1.5;color:var(--muted);margin:8px 0 0}
