.reading-width{width:min(100% - 48px,1120px);margin:0 auto;padding:0 0 80px}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:12px;align-items:center;padding-top:28px;color:var(--ink-soft);font-size:13px}
.breadcrumbs a{padding-block:8px;text-decoration:underline;text-underline-offset:4px}
.book-header{padding:44px 0 42px;border-bottom:1px solid var(--line)}
.book-header h1{font-size:clamp(34px,4.5vw,58px);line-height:1.3;letter-spacing:-.035em;margin:12px 0 18px}
.book-header h1 span{display:block;margin-top:10px;font-size:.47em;color:var(--ink-soft);font-weight:500;letter-spacing:0}
.book-description{font-size:20px;color:var(--ink-soft);margin:0 0 24px;line-height:1.7}
.landing-note{max-width:690px;color:var(--ink-soft);font-size:16px;line-height:1.9}
.reading-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:24px 0 0}
.reading-actions .button{min-height:46px;display:inline-flex;align-items:center;justify-content:center;text-decoration:none}
.version-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;padding:36px 0}
.version-card{padding:32px;border:1px solid var(--line);border-radius:24px;background:#fff;display:flex;flex-direction:column;min-width:0}
.version-card h2{font-size:30px;margin:8px 0 12px}.version-card p{color:var(--ink-soft)}.version-card .reading-actions{margin-top:auto;padding-top:18px}
.version-meta{font-size:13px;padding-top:12px}.reading-note{background:var(--wash-blue);padding:28px 32px;border-radius:20px}.reading-note h2{font-size:22px}.reading-note p{color:var(--ink-soft);line-height:1.9}
.reading-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:36px;padding-top:32px;align-items:start}
.book-toc{position:sticky;top:24px;max-height:calc(100vh - 48px);overflow:auto;border:1px solid var(--line);border-radius:16px;background:#fff;padding:16px}
.book-toc summary{font-weight:700;padding:8px 0}.book-toc ol{list-style:none;margin:8px 0 0;padding:0}.book-toc a{display:block;padding:10px 0;font-size:13px;line-height:1.65;border-top:1px solid #edf2f8;overflow-wrap:anywhere}
.reading-layout article{min-width:0}.source-text{white-space:pre-wrap;overflow-wrap:anywhere;word-break:normal;line-height:2;font-size:17px;color:#24344c;background:#fff;padding:32px;border:1px solid var(--line);border-radius:20px;tab-size:4}
.source-heading{font-size:1.23em;font-weight:750;color:var(--ink);scroll-margin-top:24px}.source-divider{font-size:10px;letter-spacing:-.7px;color:#c4d3e5;line-height:1}
.reading-end{display:flex;flex-wrap:wrap;justify-content:space-between;gap:18px;margin-top:28px}.reading-end a{display:inline-flex;align-items:center;min-height:44px;color:var(--blue-deep);text-decoration:underline;text-underline-offset:4px}
@media(max-width:900px){.reading-layout{grid-template-columns:1fr;gap:24px}.book-toc{position:static;max-height:none}.book-toc ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px}.source-text{padding:28px}}
@media(max-width:600px){.reading-width{width:calc(100% - 28px);padding-bottom:50px}.breadcrumbs{gap:8px;padding-top:16px}.book-header{padding:28px 0}.book-header h1{font-size:34px}.book-description{font-size:17px}.landing-note{font-size:15px}.version-grid{grid-template-columns:1fr;gap:16px;padding:24px 0}.version-card{padding:24px}.version-card h2{font-size:26px}.reading-note{padding:24px}.book-toc ol{display:block}.source-text{padding:20px 16px;font-size:17px;border-radius:14px}.reading-actions{gap:10px}.reading-actions .button{font-size:14px;padding:11px 16px}.reading-layout{padding-top:24px}}
@media print{.site-header,.site-footer,.skip-link,.breadcrumbs,.reading-actions,.book-toc,.reading-end{display:none}.reading-width{width:100%;padding:0}.reading-layout{display:block}.source-text{border:0;padding:0;background:white;font-size:12pt}.book-header{padding-top:0}a{color:inherit}}