:root{--ink:#123f47;--teal:#07545a;--teal2:#0d6870;--orange:#e77a2f;--paper:#f7f3e9;--mist:#e6efec;--line:#c8d8d4;--muted:#5e6f70;--shadow:0 12px 36px rgba(8,65,70,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fbfaf6;color:#243536;font-family:Georgia,'Times New Roman',serif;line-height:1.68}a{color:var(--teal);text-decoration-thickness:1px;text-underline-offset:3px}.skip{position:absolute;left:-9999px}.skip:focus{left:1rem;top:1rem;background:#fff;padding:.6rem;z-index:99}.site-header{position:sticky;top:0;z-index:50;background:rgba(247,243,233,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.header-inner{max-width:1180px;margin:auto;min-height:72px;display:flex;align-items:center;padding:0 24px;gap:26px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}.brand-mark{font:800 20px/1 Arial,sans-serif;background:var(--teal);color:white;border-radius:2px;padding:9px 8px}.brand b{font-family:Arial,sans-serif;font-size:15px;letter-spacing:.01em}.brand small{display:block;color:var(--muted);font:11px/1.3 Arial,sans-serif;margin-top:2px}.topnav{display:flex;gap:20px;margin-left:auto}.topnav a{font:600 13px Arial,sans-serif;text-decoration:none;color:var(--ink)}.topnav a:hover{color:var(--orange)}.menu-btn{display:none;margin-left:auto;border:0;background:none;font-size:24px}.notice{background:var(--teal);color:white;display:flex;justify-content:center;gap:36px;padding:7px 20px;font:12px Arial,sans-serif}.reading-shell{max-width:1180px;margin:0 auto;padding:40px 24px 70px}.hero{display:grid;grid-template-columns:minmax(260px,400px) 1fr;gap:56px;align-items:center;padding:20px 0 46px}.cover{width:100%;box-shadow:var(--shadow);border:1px solid #ddd}.eyebrow{font:700 12px Arial,sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--orange)}h1,h2,h3,h4{color:var(--ink);line-height:1.16;font-family:Arial,sans-serif}h1{font-size:clamp(2.3rem,5vw,4.9rem);letter-spacing:-.04em;margin:.25em 0}h2{font-size:2rem;margin:1.6em 0 .6em}h3{font-size:1.4rem;margin:2.1em 0 .65em;border-top:1px solid var(--line);padding-top:1.1em}h4{font-size:1.1rem;margin:1.7em 0 .5em}.lead{font-size:1.3rem;color:#38595b}.hero-copy p{max-width:720px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin:25px 0}.btn{display:inline-block;background:var(--teal);color:white;text-decoration:none;border-radius:4px;padding:12px 16px;font:700 13px Arial,sans-serif}.btn:hover{background:var(--teal2)}.btn.secondary{background:transparent;color:var(--teal);border:1px solid var(--teal)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:28px}.stats div{background:white;padding:18px}.stats b{display:block;font:700 1.4rem Arial,sans-serif;color:var(--ink)}.contents-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin:28px 0}.part-card{background:white;border:1px solid var(--line);padding:22px;box-shadow:0 4px 18px rgba(8,65,70,.04)}.part-card h2{font-size:1.25rem;margin:.1rem 0 1rem}.chapter-list{list-style:none;padding:0;margin:0}.chapter-list li{border-top:1px solid #edf1ef;padding:10px 0}.chapter-list a{text-decoration:none;font-family:Arial,sans-serif;font-size:14px}.chapter-list span{color:var(--orange);font-weight:800;margin-right:8px}.reader{max-width:780px;margin:auto;background:white;padding:52px 64px;box-shadow:var(--shadow);border:1px solid #e7e4dc}.reader .chapter-no{font:700 12px Arial,sans-serif;letter-spacing:.15em;color:var(--orange);text-transform:uppercase}.reader .part-label{font:700 12px Arial,sans-serif;color:var(--muted);margin-bottom:10px}.reader h1{font-size:2.7rem}.reader p{font-size:1.045rem;margin:.82em 0}.reader ul,.reader ol{padding-left:1.4em}.reader li{margin:.35em 0}.chapter-tools{display:flex;flex-wrap:wrap;gap:10px;margin:25px 0 35px;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.chapter-tools a{font:700 12px Arial,sans-serif}.pager{max-width:780px;margin:26px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:20px}.pager a{background:var(--mist);padding:15px;text-decoration:none;font:700 13px Arial,sans-serif}.pager .next{text-align:right}.site-footer{background:#073f45;color:#dbe9e6;padding:38px max(24px,calc((100vw - 1180px)/2));display:grid;grid-template-columns:2fr 2fr 1fr;gap:30px;font:13px Arial,sans-serif}.site-footer a{color:white}.copyright{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.2);padding-top:18px;color:#b9ceca}.search-wrap{max-width:850px;margin:auto}.searchbox{display:flex;gap:10px;margin:20px 0}.searchbox input{flex:1;padding:14px;border:1px solid var(--line);font-size:16px}.search-results{list-style:none;padding:0}.search-results li{padding:16px 0;border-bottom:1px solid var(--line)}.search-results a{font:700 16px Arial,sans-serif;text-decoration:none}.search-results p{margin:.25em 0;color:var(--muted);font-size:.95rem}.callout{background:var(--mist);border-left:4px solid var(--orange);padding:18px 20px;margin:24px 0}.section-nav{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0 28px}.section-nav a{font:700 12px Arial,sans-serif;background:#edf3f1;padding:8px 10px;text-decoration:none}
@media(max-width:800px){.hero{grid-template-columns:1fr}.cover{max-width:360px;margin:auto}.contents-grid{grid-template-columns:1fr}.topnav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--paper);padding:18px 24px;flex-direction:column;border-bottom:1px solid var(--line)}.topnav.open{display:flex}.menu-btn{display:block}.notice{display:block;text-align:center}.notice span{display:block;margin:2px}.reader{padding:34px 24px}.reader h1{font-size:2.1rem}.site-footer{grid-template-columns:1fr}.copyright{grid-column:auto}}
@media print{.site-header,.notice,.site-footer,.pager,.chapter-tools{display:none}.reading-shell{padding:0}.reader{box-shadow:none;border:0;max-width:none;padding:0}body{background:white}}


/* Network navigation and site-information refinements */
.network-banner{background:#efe3cf;color:#173f45;border-bottom:1px solid #ddc8aa;display:flex;justify-content:center;align-items:center;gap:18px;padding:9px 20px;font:600 12px/1.4 Arial,sans-serif;text-align:center}
.network-banner a{color:#07545a;font-weight:800;text-decoration:underline;text-underline-offset:3px}.network-separator{color:#c66c2d;font-weight:900}.footer-links{line-height:1.9}.info-page h2{font-size:1.45rem;margin-top:1.8em}.info-page p{font-size:1.02rem}.info-updated{margin-top:2.4rem;padding-top:1rem;border-top:1px solid var(--line);font:12px Arial,sans-serif;color:var(--muted)}
.parts-overview{margin-top:46px;padding-top:34px;border-top:1px solid var(--line)}.parts-overview>h2{margin:.25rem 0 1.2rem;font-size:1.8rem}.overview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.overview-card{background:#fff;border:1px solid var(--line);border-top:4px solid var(--orange);padding:24px 26px;box-shadow:0 4px 18px rgba(8,65,70,.035)}.overview-label{font:800 12px/1.2 Arial,sans-serif;letter-spacing:.11em;text-transform:uppercase;color:var(--orange);margin-bottom:10px}.overview-card p{margin:0;color:#29484b;font:400 15px/1.58 Arial,sans-serif}
.cookie-panel{position:fixed;left:18px;right:18px;bottom:18px;z-index:200;max-width:980px;margin:auto;background:#fffdf8;color:#243536;border:1px solid #c8d8d4;border-top:4px solid #e77a2f;box-shadow:0 14px 42px rgba(8,65,70,.22);padding:18px 20px;display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;font:13px/1.5 Arial,sans-serif}.cookie-panel p{margin:0}.cookie-panel strong{color:#123f47}.cookie-actions{display:flex;gap:9px;align-items:center;white-space:nowrap}.cookie-actions button{border:0;border-radius:4px;background:#07545a;color:#fff;padding:10px 13px;font:700 12px Arial,sans-serif;cursor:pointer}.cookie-actions a{font-weight:700}.cookie-panel[hidden]{display:none!important}
@media(max-width:800px){.network-banner{display:block;padding:9px 16px}.network-banner span{display:block}.network-banner .network-separator{display:none}.network-banner span+span{margin-top:3px}.overview-grid{grid-template-columns:1fr}.overview-card{padding:20px}.cookie-panel{grid-template-columns:1fr;left:10px;right:10px;bottom:10px}.cookie-actions{white-space:normal;flex-wrap:wrap}}
@media print{.network-banner,.cookie-panel{display:none!important}}

/* R3: flipbook feature and contents reading-map refinement */
.flipbook-feature{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:center;background:#fff7e8;border:1px solid #ead9b7;border-left:4px solid var(--orange);padding:16px 20px;margin:8px 0 22px;box-shadow:0 3px 14px rgba(8,65,70,.035)}
.flipbook-icon{font-size:30px;line-height:1} .flipbook-label{font:800 11px/1.2 Arial,sans-serif;letter-spacing:.12em;text-transform:uppercase;color:var(--orange);margin-bottom:4px}
.flipbook-feature h2{font-size:1.12rem;margin:0 0 5px}.flipbook-feature h2 a{text-decoration:none;color:var(--ink)}.flipbook-feature h2 a:hover{text-decoration:underline;color:var(--teal)}
.flipbook-feature p{margin:0;color:#40585a;font:400 14px/1.5 Arial,sans-serif;max-width:900px}
.contents-overview{margin:34px 0 28px;padding-top:28px}.contents-overview .overview-card{min-height:0}
@media(max-width:800px){.flipbook-feature{grid-template-columns:1fr;padding:16px}.flipbook-icon{font-size:26px}.flipbook-feature h2{font-size:1.05rem}}