:root{color-scheme:dark;--bg:#060d18;--panel:#101f2c;--line:#304a59;--text:#eef4f8;--muted:#b0c2ce;--cyan:#85deeb;--gold:#efd083}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 12% 0,#173546 0,transparent 55%),var(--bg);color:var(--text);font:17px/1.65 system-ui,sans-serif}a{color:var(--cyan);text-underline-offset:4px}button,a{touch-action:manipulation}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible,[tabindex="0"]:focus-visible{outline:3px solid var(--cyan);outline-offset:5px}.skip{position:absolute;left:20px;top:-100px;background:var(--bg);z-index:5;padding:12px}.skip:focus{top:10px}.masthead{max-width:1280px;margin:auto;padding:24px 32px;display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:14px;color:var(--text);text-decoration:none;font-size:13px;letter-spacing:.1em;font-weight:700}.brand 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span{font-size:10px;letter-spacing:.15em;color:var(--gold)}blockquote p{margin:10px 0;color:#d3e2eb;font-size:19px}.brief{padding:22px 24px;background:#142936;border:1px solid #395765;border-radius:12px;margin:26px 0}.brief strong,.brief span{display:block}.brief strong{color:var(--gold)}.brief span{margin-top:8px;color:var(--muted)}.primary{padding:16px 25px;background:var(--gold);color:#12212b;border:0;border-radius:9px;font-weight:700;min-height:50px}.primary:hover{background:#ffe5a5}.choices{display:grid;gap:13px;margin:28px 0}.choice{position:relative;width:100%;text-align:left;padding:22px 48px 22px 23px;color:var(--text);background:linear-gradient(120deg,#142a38,#0d1b29);border:1px solid var(--line);border-radius:12px;min-height:90px;transition:border-color .15s,background .15s}.choice strong{display:block;color:var(--gold);font-size:19px}.choice span{display:block;margin-top:7px;color:#c5d4de;font-size:15px}.choice b{position:absolute;right:20px;top:25px;color:var(--cyan)}.choice:hover:not(:disabled){border-color:var(--cyan);background:#183342}.choice:disabled{opacity:.55;cursor:not-allowed}.fine,footer{font-size:13px;color:var(--muted)}.ledger{position:sticky;top:24px;border:1px solid var(--line);border-radius:15px;background:#0b1723;padding:24px}.ledger h2{font-size:19px;margin:8px 0 24px}.meters{margin:0}.meters>div{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:10px 0}.meters dt{font-size:13px;color:var(--muted)}.meters dd{margin:0;font-size:27px;color:var(--gold);font-variant-numeric:tabular-nums}.ship-status{font-size:12px;color:var(--cyan);padding:12px 0}.route-map{list-style:none;padding:0;margin:10px 0 25px}.route-map li{font-size:12px;color:#a7b6c1;position:relative;padding:7px 0 7px 22px;border-left:1px solid var(--line)}.route-map 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dd{font-size:25px}.route-map{display:none}.ledger h2{margin-bottom:10px}}@media(max-width:520px){.masthead{padding:18px 16px;align-items:flex-start;flex-direction:column;gap:12px}.masthead img{width:40px;height:40px}main{padding:22px 16px 35px}.chapter-label{font-size:9px;flex-direction:column;gap:5px;margin-bottom:28px}.lead{font-size:18px}h1{font-size:40px}.choice{padding:19px 35px 19px 17px}.choice strong{font-size:17px}.choice b{right:13px}.star-chart{font-size:8px;gap:5px}.star-chart small{font-size:9px}.ledger{padding:20px}.meters dt{font-size:11px}.brief{padding:20px}th,td{padding:12px 8px;font-size:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Keep notebook details and comparison cells readable on narrow screens. */
.ledger .meters dt,.ledger .ship-status,.ledger .route-map li{font-size:13px}
.ledger summary,.ledger ul{font-size:14px}
@media(max-width:520px){th,td{font-size:14px}.meters{grid-template-columns:1fr}.meters>div{display:flex;gap:16px}.meters dt{min-width:0}.meters dd{flex-shrink:0}}