:root{--navy:#14243a;--navy2:#0e1b2c;--gold:#c9a24c;--cream:#f7f4ec;--ink:#202a35;--muted:#637083;--line:#ded8cb;--white:#fff;--max:1120px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--cream);line-height:1.6}a{color:inherit}.skip{position:absolute;left:-9999px}.skip:focus{left:1rem;top:1rem;background:#fff;padding:.6rem;z-index:10}.shell{width:min(calc(100% - 2rem),var(--max));margin:auto}.top{background:var(--navy2);color:#fff;border-bottom:3px solid var(--gold)}.top-inner{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:1rem}.brand{text-decoration:none}.brand strong{font-family:Georgia,serif;font-size:1.55rem}.brand small{display:block;color:#d4b86e;letter-spacing:.06em}.back{color:#fff;text-decoration:none;border:1px solid #ffffff55;padding:.55rem .8rem;border-radius:.35rem}.hero{background:linear-gradient(120deg,var(--navy),#213b5b);color:#fff;padding:4.5rem 0}.eyebrow{text-transform:uppercase;letter-spacing:.13em;color:#e0c47c;font-weight:700;font-size:.78rem}.hero h1{font-family:Georgia,serif;font-size:clamp(2.4rem,6vw,4.8rem);line-height:1.03;margin:.45rem 0 1rem}.hero p{max-width:760px;font-size:1.12rem;color:#e7edf4}.actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.5rem}.btn{display:inline-block;text-decoration:none;padding:.8rem 1rem;border-radius:.35rem;font-weight:700}.btn.gold{background:var(--gold);color:#172234}.btn.ghost{border:1px solid #ffffff66;color:#fff}.section{padding:3.5rem 0}.section h2{font-family:Georgia,serif;color:var(--navy);font-size:2rem;margin:0 0 .65rem}.lead{max-width:800px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;margin-top:1.5rem}.card{background:#fff;border:1px solid var(--line);border-radius:.55rem;padding:1.25rem;box-shadow:0 8px 24px #14243a0b}.card h3{margin:.1rem 0 .45rem;color:var(--navy)}.card code{background:#f2efe7;padding:.1rem .3rem;border-radius:.2rem}.toc{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.7rem;margin:1.4rem 0}.toc a{text-decoration:none;background:#fff;border:1px solid var(--line);padding:.85rem;border-radius:.4rem;color:var(--navy);font-weight:700}.demo{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}table{width:100%;border-collapse:collapse;margin:1rem 0;background:#fff;table-layout:fixed}th,td{border:1px solid #bbc2cb;padding:.65rem;text-align:left;vertical-align:top;overflow-wrap:anywhere}th{background:#eef1f5;color:var(--navy)}.note{border-left:4px solid var(--gold);background:#fff;padding:1rem 1.1rem;margin:1.2rem 0}.footer{background:var(--navy2);color:#cfd8e4;padding:2rem 0}.footer a{color:#e1c578}@media(max-width:760px){.grid,.toc{grid-template-columns:1fr}.top-inner{align-items:flex-start;padding:1rem 0;flex-direction:column}.hero{padding:3rem 0}table{font-size:.9rem}}

.book-template-panel{margin:2rem 0 2.5rem;padding:2rem;border:1px solid rgba(185,143,61,.35);border-radius:18px;background:rgba(185,143,61,.07)}
.book-template-panel h2{margin-top:.25rem}
.book-template-panel .btn{display:inline-block;margin-top:.5rem}
@media (max-width:640px){.book-template-panel{padding:1.25rem}}

.book-art-panel{margin:2rem 0 2.5rem;padding:2rem;border:1px solid var(--line);border-radius:18px;background:#fff}
.book-art-panel h2{margin-top:.25rem}
.art-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:1rem;margin:1.5rem 0}
.art-card{display:flex;flex-direction:column;align-items:center;gap:.6rem;text-decoration:none;background:var(--cream);border:1px solid var(--line);border-radius:.6rem;padding:1rem;color:var(--navy);font-weight:700;transition:transform .15s ease,box-shadow .15s ease}
.art-card:hover,.art-card:focus-visible{transform:translateY(-2px);box-shadow:0 10px 24px #14243a18}
.art-card img{display:block;width:100%;max-width:150px;aspect-ratio:1/1;object-fit:contain;background:#fff;border-radius:.35rem}
@media(max-width:900px){.art-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:560px){.art-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.book-art-panel{padding:1.25rem}}

/* 2026-09 readability and whitespace revision */
html{font-size:18px}
body{line-height:1.72}
.shell{width:min(calc(100% - 3.5rem),var(--max))}
.top-inner{min-height:92px}
.brand strong{font-size:1.7rem}
.brand small{font-size:.74rem;margin-top:.18rem}
.epub-mini-seal{width:58px;height:58px;object-fit:contain;margin-left:auto;filter:drop-shadow(0 5px 8px #0004)}
.back{font-size:.82rem;padding:.65rem .95rem}
.hero{padding:5.75rem 0}
.hero h1{font-size:clamp(2.65rem,6vw,5rem);margin:.6rem 0 1.25rem}
.hero p{font-size:1.15rem;line-height:1.75;max-width:820px}
.actions{margin-top:2rem;gap:1rem}
.btn{padding:.9rem 1.15rem}
.section{padding:4.75rem 0}
.section h2{font-size:2.2rem;margin-bottom:.9rem}
.lead{max-width:860px;font-size:1.02rem;line-height:1.75}
.grid{gap:1.35rem;margin-top:2rem}
.card{padding:1.55rem;border-radius:.7rem}
.card h3{font-size:1.12rem}
.toc{gap:1rem;margin:1.8rem 0 2.2rem}
.toc a{padding:1rem 1.05rem}
th,td{padding:.85rem}
.note{padding:1.25rem 1.35rem;margin:1.6rem 0}
.book-template-panel,.book-art-panel{margin:2.8rem 0 3.3rem;padding:2.4rem}
.art-grid{gap:1.25rem;margin:2rem 0}
.footer{padding:2.5rem 0}
@media(max-width:760px){html{font-size:17px}.shell{width:min(calc(100% - 2rem),var(--max))}.epub-mini-seal{width:50px;height:50px;margin-left:0}.hero{padding:4rem 0}.section{padding:3.5rem 0}}


/* 2026-09 mobile vertical-flow revision */
@media(max-width:760px){
  html{font-size:18px}
  body{overflow-x:hidden}
  .shell{width:min(calc(100% - 30px),var(--max))}
  .top-inner{min-height:auto;padding:18px 0;display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}
  .brand strong{font-size:1.5rem}
  .brand small{font-size:.7rem;line-height:1.4}
  .epub-mini-seal{width:48px;height:48px;margin:0}
  .back{grid-column:1/-1;display:block;text-align:center;width:100%;padding:.8rem 1rem;font-size:.95rem}
  .hero{padding:3.4rem 0}
  .hero h1{font-size:clamp(2.6rem,14vw,4rem)}
  .hero p{font-size:1rem;line-height:1.72}
  .actions{display:grid;grid-template-columns:1fr;gap:.8rem}
  .btn{text-align:center;width:100%;padding:1rem}
  .section{padding:3.2rem 0}
  .section h2{font-size:1.9rem}
  .lead{font-size:1rem}
  .toc{grid-template-columns:1fr;gap:.75rem}
  .toc a{padding:1rem;font-size:1rem}
  .grid{grid-template-columns:1fr;gap:1rem}
  .card{padding:1.35rem}
  table{font-size:.92rem;display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .book-template-panel,.book-art-panel{padding:1.25rem;margin:2rem 0}
  .art-grid{grid-template-columns:1fr 1fr;gap:.8rem}
}
@media(max-width:420px){
  .art-grid{grid-template-columns:1fr}
}