/* Layout: sticky tree navigation on the left, one readable article column (~68ch) on the right; one article shown at a time, routed by #slug. Yellow works as a highlighter pen, never as a fill. */
:root {
  --bg: #F9F8F5;
  --surface: #FFFFFF;
  --ink: #141311;
  --muted: #5E5A50;
  --line: #E4E0D4;
  --mark: #FFCC00;
  --mark-soft: #FFF1B3;
  --link: #141311;
  --danger: #B42318;
  --font-display: "Jost", "Futura", "Avenir Next", system-ui, sans-serif;
  --font-body: "Instrument Sans", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.6rem;
  --step-3: clamp(2rem, 4.5vw, 2.8rem);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #151412; --surface: #1D1C19; --ink: #EFEDE6; --muted: #A9A498; --line: #34322C;
    --mark: #FFCC00; --mark-soft: #4A3D06; --link: #FFE070; --danger: #FF8A7A; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #151412; --surface: #1D1C19; --ink: #EFEDE6; --muted: #A9A498; --line: #34322C;
  --mark: #FFCC00; --mark-soft: #4A3D06; --link: #FFE070; --danger: #FF8A7A; color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  background: var(--bg); color: var(--ink);
  font-family: var(--font-body); font-size: var(--step-0); line-height: 1.65;
}
a { color: var(--link); text-decoration-color: var(--mark); text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:hover { background: var(--mark-soft); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--mark); outline-offset: 2px; border-radius: 2px; }

/* Header */
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: var(--bg); border-bottom: 1px solid var(--line);
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.topbar-inner { max-width: 1180px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 14px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand:hover { background: none; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 50%; background: var(--mark); color: #141311;
  display: grid; place-items: center; font-family: var(--font-display); font-weight: 700; font-size: 1rem; letter-spacing: .02em; flex: none;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; color: var(--ink); }
.brand-tag { font-size: .85rem; color: var(--muted); }
.menu-btn {
  display: none; flex: none; font: 600 .95rem var(--font-display); color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: 999px; padding: 8px 16px; cursor: pointer;
}

/* Shell */
.shell {
  max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 56px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 40px 80px;
}
nav.site-nav { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 92px); align-self: start; max-height: calc(100vh - 120px); overflow-y: auto; padding-right: 8px; }
.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav ul ul { margin-left: 14px; padding-left: 12px; border-left: 1px solid var(--line); }
.site-nav li { margin: 0; }
.site-nav a {
  display: block; text-decoration: none; color: var(--muted); font-size: .95rem; line-height: 1.35;
  padding: 6px 8px; border-radius: 4px;
}
.site-nav a:hover { color: var(--ink); background: var(--mark-soft); }
.site-nav > ul > li > a { font-family: var(--font-display); font-weight: 600; color: var(--ink); font-size: 1.02rem; margin-top: 6px; }
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 600; background: none; box-shadow: inset 3px 0 0 var(--mark); border-radius: 0 4px 4px 0; }

/* Article */
main { min-width: 0; }
article { max-width: 68ch; }
.crumbs { font-size: .85rem; color: var(--muted); letter-spacing: .02em; margin-bottom: 14px; display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); }
.crumbs span[aria-hidden] { opacity: .5; }
article h1 {
  font-family: var(--font-display); font-weight: 600; font-size: var(--step-3); line-height: 1.12;
  margin: 0 0 24px; text-wrap: balance; letter-spacing: -.01em;
}
article h1::after { content: ""; display: block; width: 48px; height: 4px; margin-top: 18px; background: var(--mark); border-radius: 2px; }
article h2 { font-family: var(--font-display); font-weight: 600; font-size: var(--step-2); line-height: 1.2; margin: 44px 0 12px; text-wrap: balance; }
article h3 { font-family: var(--font-display); font-weight: 600; font-size: var(--step-1); line-height: 1.3; margin: 30px 0 8px; }
article h2 a, article h3 a { color: var(--ink); text-decoration: none; }
article h2 a:hover, article h3 a:hover { background: none; text-decoration: underline; text-decoration-color: var(--mark); }
article p { margin: 0 0 16px; }
article ul, article ol { margin: 0 0 18px; padding-left: 1.4em; }
article li { margin-bottom: 6px; }
article li::marker { color: var(--muted); }
article ol li::marker { font-family: var(--font-display); font-weight: 600; color: var(--ink); }
.lead { font-size: var(--step-1); line-height: 1.55; }
.more { font-family: var(--font-display); font-weight: 500; }
blockquote, .example {
  margin: 0 0 18px; padding: 14px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 6px;
}
blockquote p:last-child, .example p:last-child { margin-bottom: 0; }
.example-label { display: block; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; margin-bottom: 6px; }
.compare { display: grid; gap: 12px; margin: 0 0 20px; }
.compare > div { padding: 14px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; }
.compare .good { border-color: var(--mark); box-shadow: inset 4px 0 0 var(--mark); }
.compare strong { font-family: var(--font-display); }
.cloze { font-size: .98rem; }
.blank { display: inline-block; min-width: 4.5em; border-bottom: 1.5px solid var(--muted); color: var(--muted); font-size: .8em; text-align: left; line-height: 1.2; }
.reveal-btn {
  font: 600 .9rem var(--font-display); background: var(--mark); color: #141311; border: 0; border-radius: 999px; padding: 8px 18px; cursor: pointer;
}
.answers { margin-top: 12px; }
figure { margin: 8px 0 24px; }
figure .frame { background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 18px; overflow-x: auto; }
.shot { background: #FFFFFF; border: 1px solid var(--line); border-radius: 6px; padding: 12px; overflow-x: auto; }
.shot img { display: block; margin: 0 auto; height: auto; }
.shot a:hover { background: none; }
a.elavult { color: var(--danger); text-decoration-color: var(--danger); }
a.elavult::after {
  content: "ELAVULT"; display: inline-block; margin-left: 6px; padding: 0 5px; border: 1px solid currentColor; border-radius: 3px;
  font: 700 .62rem/1.5 var(--font-body); letter-spacing: .08em; vertical-align: .15em; text-decoration: none;
}
figcaption { font-size: .88rem; color: var(--muted); margin-top: 8px; line-height: 1.5; }
.ph { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.ph-title { font-family: var(--font-display); font-weight: 600; }
svg text { font-family: var(--font-body); }
.pager { max-width: 68ch; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--line); }
.pager a { display: block; text-decoration: none; padding: 12px 16px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); min-width: 0; }
.pager a:hover { border-color: var(--mark); background: var(--surface); }
.pager small { display: block; font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.pager span { font-family: var(--font-display); font-weight: 600; color: var(--ink); }
.pager .next { text-align: right; grid-column: 2; }
.contact { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
.avatar { width: 140px; height: 140px; border-radius: 50%; object-fit: cover; object-position: 50% 30%; flex: none; }
.license { font-size: .92rem; color: var(--muted); }
.reading-list dt { font-family: var(--font-display); font-weight: 600; margin-top: 16px; }
.reading-list dd { margin: 2px 0 0; }
.reading-list .by { font-style: italic; color: var(--muted); font-weight: 400; font-family: var(--font-body); }

@media (max-width: 900px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 0; padding-block: 24px 64px; }
  .menu-btn { display: inline-block; }
  nav.site-nav { position: static; max-height: none; overflow: visible; padding: 0 0 24px; margin-bottom: 24px; border-bottom: 1px solid var(--line); }
  .brand-tag { display: none; }
}
@media (max-width: 480px) {
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
}
@media (prefers-reduced-motion: no-preference) {
  article { animation: in .25s ease-out; }
  @keyframes in { from { transform: translateY(6px); } to { transform: none; } }
}

/* Skip link */
.skip { position: absolute; left: -9999px; top: 0; }
.skip:focus { left: max(16px, env(safe-area-inset-left, 0px)); top: calc(env(safe-area-inset-top, 0px) + 8px); z-index: 50; background: var(--surface); padding: 8px 14px; border-radius: 4px; }

/* Search */
.search { position: relative; flex: 1 1 260px; max-width: 360px; margin-left: auto; }
.search label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.search input {
  width: 100%; font: 400 .95rem var(--font-body); color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: 999px; padding: 9px 16px 9px 38px;
}
.search input:focus { outline: none; border-color: var(--ink); }
.search-icon { position: absolute; left: 14px; top: 50%; width: 15px; height: 15px; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; z-index: 30; margin: 0; padding: 6px; list-style: none;
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,.12);
  max-height: min(70vh, 480px); overflow-y: auto;
}
.search-results li { margin: 0; }
.search-results a { display: block; padding: 8px 10px; border-radius: 5px; text-decoration: none; color: var(--ink); }
.search-results a:hover, .search-results a.active { background: var(--mark-soft); }
.search-results .r-title { display: block; font-family: var(--font-display); font-weight: 600; }
.search-results .r-snip { display: block; font-size: .85rem; color: var(--muted); line-height: 1.45; }
.search-results mark { background: none; color: var(--ink); font-weight: 700; }
.search-results .r-empty { padding: 10px; color: var(--muted); font-size: .9rem; }

/* Footer */
.site-foot {
  border-top: 1px solid var(--line); background: var(--surface); color: var(--muted); font-size: .92rem;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); padding-block: 40px 28px;
}
.foot-inner { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr) minmax(0, 1fr); gap: 32px; }
.foot-brand { font-family: var(--font-display); font-weight: 600; font-size: 1.15rem; color: var(--ink); margin: 0 0 6px; }
.foot-col p { margin: 0 0 10px; max-width: 40ch; }
.foot-col h2 { font-family: var(--font-display); font-weight: 600; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink); margin: 0 0 10px; }
.foot-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.foot-col a { color: var(--muted); text-decoration: none; }
.foot-col a:hover { color: var(--ink); background: none; text-decoration: underline; text-decoration-color: var(--mark); }
.foot-bottom { max-width: 1180px; margin: 28px auto 0; padding-top: 18px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; font-size: .85rem; }
.foot-bottom a { color: var(--muted); }
.mail { user-select: all; color: var(--ink); }
@media (max-width: 900px) {
  .topbar-inner { flex-wrap: wrap; }
  .search { order: 3; flex-basis: 100%; max-width: none; }
  .foot-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .foot-inner .foot-col:first-child { grid-column: 1 / -1; }
}
@media (max-width: 480px) { .foot-inner { grid-template-columns: minmax(0, 1fr); } }