/* Shared reading route. Static HTML and CSS keep every page usable without JS. */
html { scroll-padding-top: 96px; }
.d0-reading-header, .d0-chapter-end, .d0-contents { box-sizing: border-box; font-family: var(--font-mono); }
.d0-reading-header *, .d0-chapter-end *, .d0-contents * { box-sizing: border-box; }
.d0-reading-header { position: sticky; top: 0; z-index: 90; width: 100%; color: var(--ink); background: color-mix(in srgb, var(--surface) 96%, transparent); border-bottom: 1px solid var(--line); backdrop-filter: blur(18px); }
.d0-reading-inner { max-width: 1228px; min-height: 72px; margin: auto; padding: 0 24px; display: flex; align-items: center; gap: clamp(20px, 4vw, 60px); }
.d0-reading-header a { color: inherit; text-decoration: none; }
.d0-reading-header a:hover, .d0-reading-header summary:hover { color: var(--ink); text-decoration: none; }
.d0-reading-header a:focus-visible, .d0-reading-header summary:focus-visible, .d0-chapter-end a:focus-visible, .d0-contents a:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
.d0-reading-brand { display: inline-flex; align-items: center; gap: 10px; flex: none; font-size: .96rem; font-weight: 500; letter-spacing: .04em; }
.d0-reading-brand img { display: block; width: 28px; height: 28px; }
.d0-brand-dim { color: var(--ink-soft); }
.d0-reading-desktop { position: static; z-index: auto; display: flex; align-items: center; justify-content: flex-end; gap: clamp(12px, 2.2vw, 28px); flex: 1; width: auto; padding: 0; border: 0; background: none; backdrop-filter: none; }
.d0-reading-desktop > a, .d0-reading-desktop > details > summary { display: inline-flex; align-items: center; gap: 7px; min-height: 44px; padding: 0; color: var(--ink-muted); font-size: var(--type-nav-size); letter-spacing: var(--type-nav-tracking); white-space: nowrap; cursor: pointer; }
.d0-reading-desktop > a[aria-current="page"], .d0-nav-group.is-current > summary { color: var(--ink); }
.d0-reading-desktop > .d0-nav-contents { color: var(--ink); border-bottom: 1px solid var(--ink); }
.d0-nav-contact { border: 1px solid var(--line); padding: 0 14px !important; }
.d0-nav-contact:hover { background: var(--ink); color: var(--surface) !important; }
.d0-nav-group { position: relative; }
.d0-nav-group summary, .d0-reading-mobile summary { list-style: none; }
.d0-nav-group summary::-webkit-details-marker, .d0-reading-mobile summary::-webkit-details-marker { display: none; }
.d0-nav-group summary span, .d0-reading-mobile summary span { font-size: .8rem; }
.d0-nav-panel { position: absolute; top: calc(100% + 10px); right: -24px; width: 260px; padding: 10px; background: var(--surface-raised); border: 1px solid var(--line); box-shadow: 0 24px 50px color-mix(in srgb, var(--surface-deep) 40%, transparent); }
.d0-nav-panel a, .d0-reading-mobile-panel a { display: flex; align-items: center; gap: 17px; min-height: 48px; padding: 8px 12px; color: var(--ink-muted); font-size: var(--type-nav-size); }
.d0-nav-panel a:hover, .d0-reading-mobile-panel a:hover, .d0-nav-panel a[aria-current="page"], .d0-reading-mobile-panel a[aria-current="page"] { background: var(--line); color: var(--ink); }
.d0-nav-number { width: 45px; flex: none; color: var(--ink-soft); font-size: .62rem; text-transform: uppercase; }
.d0-reading-mobile-actions { display: none; margin-left: auto; align-items: center; gap: 12px; }
.d0-reading-mobile-actions > a { font-size: .72rem; border-bottom: 1px solid var(--ink); }
.d0-reading-mobile summary { display: flex; align-items: center; gap: 7px; min-height: 44px; padding: 0 10px; border: 1px solid var(--line); font-size: var(--type-nav-size); cursor: pointer; }
.d0-reading-mobile-panel { position: absolute; top: 100%; left: 0; right: 0; z-index: 91; width: 100%; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); padding: 12px max(16px, calc((100vw - 1180px)/2)); background: var(--surface-raised); border-bottom: 1px solid var(--line); box-shadow: 0 22px 40px color-mix(in srgb, var(--surface-deep) 40%, transparent); }
.d0-chapter-end { padding: 72px 24px 44px; color: var(--ink); background: var(--surface-raised); border-top: 1px solid var(--line); }
.d0-chapter-inner { width: min(100%, 1180px); margin: auto; }
.d0-chapter-kicker, .d0-chapter-small { max-width: none; margin: 0 0 18px; color: var(--ink-soft); font-size: .68rem; font-weight: 500; letter-spacing: .18em; text-transform: uppercase; }
.d0-chapter-main { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: end; gap: 24px; padding-bottom: 54px; }
.d0-chapter-main h2 { max-width: none; margin: 0 0 14px; color: var(--ink); font: 400 clamp(2.1rem,5vw,4.2rem)/1.03 var(--font-serif); }
.d0-chapter-main p:not(.d0-chapter-small) { max-width: 64ch; margin: 0; color: var(--ink-muted); font-size: .86rem; }
.d0-chapter-next { display: inline-flex; align-items: center; justify-content: space-between; gap: 22px; min-height: 58px; padding: 13px 19px; border: 1px solid var(--ink-muted); color: var(--ink) !important; font-size: .78rem; text-decoration: none !important; white-space: nowrap; }
.d0-chapter-next:hover { background: var(--ink); color: var(--surface) !important; }
.d0-chapter-links { position: static; display: flex; flex-wrap: wrap; gap: 15px 30px; width: auto; padding: 18px 0 0; border: 0; border-top: 1px solid var(--line); background: none; backdrop-filter: none; font-size: .7rem; }
.d0-chapter-links a { color: var(--ink-muted); text-decoration: none; }
.d0-chapter-links a:hover { color: var(--ink); }
.d0-chapter-links span { color: var(--ink-soft); }
.d0-contents { min-height: 70vh; background: var(--surface); color: var(--ink); }
.d0-contents-hero { width: min(100% - 48px,1180px); margin: auto; padding: clamp(80px,12vw,150px) 0 70px; }
.d0-contents-hero .eyebrow { color: var(--ink-soft); }
.d0-contents-hero h1 { max-width: 11ch; margin: 0 0 24px; font: 400 clamp(3.5rem,8vw,7.5rem)/.95 var(--font-serif); }
.d0-contents-hero p { max-width: 68ch; color: var(--ink-muted); }
.d0-contents-list { width: min(100% - 48px,1180px); max-width: none; margin: 0 auto; padding: 0 0 110px; list-style: none; }
.d0-contents-entry { display: block; margin: 0; padding: 35px 0 39px; border-top: 1px solid var(--line); }
.d0-contents-page { display: grid; grid-template-columns: 90px minmax(0,1fr); gap: 24px; }
.d0-contents-number { color: var(--ink-soft); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; padding-top: 8px; }
.d0-contents-page h2 { max-width: none; margin: 0 0 8px; font: 400 clamp(1.9rem,4vw,3.35rem)/1.08 var(--font-serif); }
.d0-contents-page h2 a { color: var(--ink); text-decoration: none; }
.d0-contents-page h2 a:hover { text-decoration: underline; }
.d0-contents-page p { max-width: 65ch; margin: 0; color: var(--ink-muted); font-size: .8rem; }
.d0-contents-sections { display: flex; flex-wrap: wrap; gap: 10px 25px; margin: 24px 0 0 114px; }
.d0-contents-sections a, .d0-contents-sections span { color: var(--ink-soft); font-size: .71rem; text-decoration: none; }
.d0-contents-sections a:hover { color: var(--ink); text-decoration: underline; }
@media (max-width: 820px) { .d0-reading-desktop { display: none; } .d0-reading-mobile-actions { display: flex; } }
@media (max-width: 560px) {
  .d0-reading-inner { min-height: 64px; padding-inline: 18px; }
  .d0-reading-mobile-panel { grid-template-columns: 1fr; max-height: calc(100svh - 64px); overflow-y: auto; padding: 9px 14px; }
  .d0-chapter-end { padding: 55px 18px 30px; }
  .d0-chapter-main { grid-template-columns: 1fr; padding-bottom: 35px; }
  .d0-chapter-next { justify-self: start; }
  .d0-contents-hero, .d0-contents-list { width: min(100% - 36px,1180px); }
  .d0-contents-page { grid-template-columns: 1fr; gap: 8px; }
  .d0-contents-sections { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) { .d0-reading-header *, .d0-chapter-end *, .d0-contents * { scroll-behavior: auto !important; animation: none !important; transition: none !important; } }