/* Card site layout: the design system's post layout (masthead, stamp,
   headline with the Klein block, running text) at web scale. Colors and fonts
   come from tokens.css; both themes follow prefers-color-scheme. */

* { box-sizing: border-box; }
html { background: var(--bg); color: var(--fg); }
body { margin: 0; font: 400 18px/1.6 var(--font-text); -webkit-text-size-adjust: 100%; }
.wrap { max-width: 64rem; margin: 0 auto; padding: 32px 24px 96px; }

a { color: var(--blue); text-underline-offset: .18em; text-decoration-thickness: .06em; }
code, pre, kbd { font-family: var(--font-mono); font-variant-ligatures: none; }

/* masthead */
.mast { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; font: 800 17px/1 var(--font-mono); padding-bottom: 13px; border-bottom: 2px solid var(--fg); }
.mast a { color: var(--fg); text-decoration: none; }
.mast nav { display: flex; gap: 20px; font-weight: 400; font-size: 13px; }
.mast nav a { color: var(--grey); }

/* stamp: short monospace line above a headline, first item blue */
.stamp { display: flex; flex-wrap: wrap; gap: 6px 17px; font: 400 13px/1.3 var(--font-mono); color: var(--grey); font-variant-ligatures: none; }
.stamp > :first-child { color: var(--blue); }
.stamp a { text-decoration: none; }
.stamp a:hover { text-decoration: underline; }
main > .stamp, .card > .stamp { margin-top: 48px; }

/* headline with the Klein block */
.hx { font-weight: 700; letter-spacing: -.025em; font-size: clamp(28px, 5.4vw, 40px); line-height: 1.1; margin: 12px 0 28px; overflow-wrap: break-word; }
.hx.long { font-size: clamp(22px, 3.8vw, 28px); line-height: 1.25; }
.hx a { color: var(--blue); }
.k { display: inline-block; width: .5em; height: .8em; background: var(--klein); vertical-align: -.04em; margin-left: .08em; }
@media (prefers-color-scheme: dark) { .k { background: var(--blue); } }
/* Live surfaces: the Klein block blinks like a cursor (530 ms on, 530 ms off). */
.k.blink { animation: k-blink 1.06s steps(1) infinite; }
@keyframes k-blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .k.blink { animation: none; } }

.lead { color: var(--grey); margin: 0 0 32px; }
.empty { font: 400 15px var(--font-mono); color: var(--grey); }

/* Attachment: images */
.images { display: grid; gap: 12px; margin: 0 0 32px; }
.images figure { margin: 0; }
.images img { display: block; max-width: 100%; height: auto; background: var(--panel); }

/* Attachment: Link preview line */
.link { display: grid; gap: 4px; margin: 0 0 32px; padding: 16px 20px; background: var(--panel); text-decoration: none; }
.link .title { color: var(--fg); font-weight: 600; }
.link .description { color: var(--grey); font-size: 16px; }
.link .url { font: 400 13px/1.4 var(--font-mono); color: var(--blue); overflow-wrap: anywhere; }
.link .url::before { content: "→ "; }

/* Attachment: Article */
.article { margin: 0 0 32px; }
.article > :first-child { margin-top: 0; }
.article p, .article ul, .article ol { margin: 0 0 20px; }
.article h1, .article h2, .article h3, .article h4 { font-weight: 700; letter-spacing: -.02em; line-height: 1.2; margin: 40px 0 14px; }
.article h1 { font-size: 28px; }
.article h2 { font-size: 24px; }
.article h3, .article h4 { font-size: 19px; }
.article blockquote { margin: 28px 0; padding: 0 0 0 18px; border-left: 4px solid var(--klein); color: var(--fg); }
.article code { font-size: .92em; background: var(--panel); padding: .1em .3em; }
.article pre { background: var(--panel); padding: 16px 20px; overflow-x: auto; font-size: 15px; line-height: 1.5; }
.article pre code { background: none; padding: 0; }
.article hr { border: 0; border-top: 1px solid var(--faint); margin: 32px 0; }
.article img { max-width: 100%; height: auto; }
.article table { border-collapse: collapse; font-size: 16px; }
.article th, .article td { border-bottom: 1px solid var(--faint); padding: 6px 12px 6px 0; text-align: left; }

.bluesky { font: 400 13px var(--font-mono); margin: 0; }
.bluesky a::before { content: "→ "; }

/* Replies, Mentioned by, and the home list */
h2.label { font: 400 13px/1 var(--font-mono); color: var(--grey); margin: 56px 0 0; padding-bottom: 12px; border-bottom: 2px solid var(--fg); }
.context { margin: 48px 0 0; }
.context h2.label { margin-top: 0; }
.context .cards li { border-bottom: 0; padding-bottom: 0; }
.cards { list-style: none; margin: 0; padding: 0; }
.cards li { padding: 18px 0; border-bottom: 1px solid var(--faint); }
.cards p { margin: 6px 0 0; overflow-wrap: break-word; }

/* layout: content left, sidebar right (navigation only; scrolls with the page) */
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 13rem; gap: 56px; align-items: start; }
.sidebar { margin-top: 48px; font-size: 14px; line-height: 1.4; }
.side-block { margin: 0 0 32px; }
.side-block h2 { font: 400 13px/1 var(--font-mono); color: var(--grey); margin: 0 0 10px; padding-bottom: 10px; border-bottom: 2px solid var(--fg); }
.side-block ul, .side-block ol { list-style: none; margin: 0; padding: 0; }
.side-block li { padding: 5px 0; overflow-wrap: break-word; }
.side-block a { color: var(--fg); text-decoration: none; }
.side-block a:hover { color: var(--blue); }
.side-block [aria-current] { color: var(--blue); }
.side-path li + li::before { content: "→ "; color: var(--blue); font-family: var(--font-mono); }
.side-more { margin: 6px 0 0; font: 400 13px var(--font-mono); }
.side-more a { color: var(--grey); }
.side-note { color: var(--grey); font: 400 12px var(--font-mono); }
@media (max-width: 760px) {
  .layout { display: block; }
  .sidebar { margin-top: 64px; }
}