/* blog.backthread.dev — shared stylesheet.
   Visual identity carried over from the lander (v3): cream ground, Cormorant
   Garamond display serif, system sans for body. Adds long-form reading
   typography + a dark-mode variant (the lander is light-only; a reading surface
   earns dark mode). */

@font-face { font-family: "Cormorant Garamond"; font-style: normal; font-weight: 500; font-display: swap; src: url("/assets/fonts/cormorant-garamond-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Cormorant Garamond"; font-style: normal; font-weight: 600; font-display: swap; src: url("/assets/fonts/cormorant-garamond-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Cormorant Garamond"; font-style: italic; font-weight: 500; font-display: swap; src: url("/assets/fonts/cormorant-garamond-latin-500-italic.woff2") format("woff2"); }
@font-face { font-family: "Cormorant Garamond"; font-style: italic; font-weight: 600; font-display: swap; src: url("/assets/fonts/cormorant-garamond-latin-600-italic.woff2") format("woff2"); }

:root {
  --bg: #faf9f5;
  --surface: #f3f1ea;
  --surface-2: #e9e6dd;
  --border: #dddad2;
  --border-dim: #e7e4dc;
  --ink: #131311;
  --ink-2: #34332f;
  --ink-3: #6c6b64;
  --ink-4: #9c9b93;
  --accent: #fe6f5e;
  --accent-2: #f5533f;
  --accent-dim: rgba(254, 111, 94, 0.10);
  --accent-glow: rgba(254, 111, 94, 0.30);
  --code-bg: #f3f1ea;
  --code-ink: #34332f;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Monaco, "Cascadia Code", monospace;
  --serif: "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --max: 1120px;
  --measure: 40rem;
  --nav-h: 64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16150f;
    --surface: #201e16;
    --surface-2: #2a271d;
    --border: #34312685;
    --border-dim: #2c291f;
    --ink: #f3f1e9;
    --ink-2: #d8d5c9;
    --ink-3: #a5a294;
    --ink-4: #78766b;
    --accent: #ff8272;
    --accent-2: #ff6f5e;
    --accent-dim: rgba(255, 130, 114, 0.12);
    --accent-glow: rgba(255, 130, 114, 0.30);
    --code-bg: #201e16;
    --code-ink: #e4e1d6;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  line-height: 1.65; font-size: 18px;
}
.page { background: var(--bg); min-height: 100vh; display: flex; flex-direction: column; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #fff; }
img { max-width: 100%; height: auto; }

h1, h2, h3, h4 { font-family: var(--serif); margin: 0; color: var(--ink); font-weight: 600; letter-spacing: -0.02em; text-wrap: balance; }
h1 { font-size: clamp(2.4rem, 6vw, 3.6rem); line-height: 1.03; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.2rem); line-height: 1.1; letter-spacing: -0.02em; }
h3 { font-size: 1.4rem; line-height: 1.2; }
p { color: var(--ink-2); }

.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent);
  margin: 0 0 14px;
}
.lead { font-size: clamp(1.08rem, 2vw, 1.28rem); line-height: 1.55; color: var(--ink-2); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100; height: var(--nav-h);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border-dim);
}
.nav-inner { max-width: var(--max); margin: 0 auto; height: 100%; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
@media (min-width: 760px) { .nav-inner { padding: 0 32px; } }
.brand { display: inline-flex; align-items: baseline; gap: 9px; font-weight: 700; font-size: 19px; letter-spacing: -0.02em; color: var(--ink); }
.brand::before { content: ""; align-self: center; width: 11px; height: 11px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--accent-dim); }
.brand__sub { font-family: var(--mono); font-weight: 600; font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-4); }
.nav-links { display: none; gap: 26px; align-items: center; }
@media (min-width: 640px) { .nav-links { display: inline-flex; } }
.nav-links a { font-size: 15px; font-weight: 500; color: var(--ink-3); transition: color 120ms; }
.nav-links a:hover { color: var(--accent); }

/* ---------- layout ---------- */
.wrap { flex: 1 0 auto; max-width: var(--max); width: 100%; margin: 0 auto; padding: 56px 20px 88px; }
@media (min-width: 760px) { .wrap { padding: 84px 32px 120px; } }

/* ---------- index ---------- */
.wrap--index { padding-top: 40px; padding-bottom: 96px; }
@media (min-width: 760px) { .wrap--index { padding-top: 52px; } }
.index-title {
  font-family: var(--serif); font-weight: 500; font-style: italic;
  font-size: clamp(1.25rem, 2.4vw, 1.5rem); line-height: 1.25; letter-spacing: 0;
  color: var(--ink-3); max-width: 46ch; margin: 0 0 30px;
}

.cards { list-style: none; margin: 0; padding: 0; display: grid; gap: 20px; }
.card { border-top: 1px solid var(--border); }
.card:last-child { border-bottom: 1px solid var(--border); }
.card__link { display: block; padding: 26px 4px; transition: background 160ms; }
.card__link:hover { background: var(--surface); }
.card__date { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-4); }
.card__title { font-size: clamp(1.5rem, 3vw, 2rem); margin: 8px 0 10px; color: var(--ink); }
.card__link:hover .card__title { color: var(--accent-2); }
.card__desc { margin: 0 0 12px; max-width: 68ch; color: var(--ink-2); }
.card__more { font-family: var(--mono); font-size: 12.5px; font-weight: 600; color: var(--accent); letter-spacing: 0.04em; }
.empty { color: var(--ink-3); font-style: italic; }

/* ---------- post ---------- */
.post { max-width: var(--measure); margin: 0 auto; }
.post__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.04em; color: var(--ink-4); margin-bottom: 20px; }
.post__meta time { color: var(--ink-3); }
.post__back { color: var(--ink-3); margin-right: auto; transition: color 120ms; }
.post__back:hover { color: var(--accent); }
.post__jump { color: var(--accent-2); transition: color 120ms; }
.post__jump:hover { color: var(--accent); }
.post__dek { margin: 2px 0 14px; font-size: clamp(1.02rem, 1.7vw, 1.16rem); line-height: 1.45; color: var(--ink-2); font-weight: 500; max-width: 58ch; }
.post__dek em { font-style: italic; color: var(--ink); }
.post > h1 { margin: 0 0 20px; }

/* author byline */
.byline { display: flex; align-items: center; gap: 12px; margin: 0 0 36px; padding-bottom: 26px; border-bottom: 1px solid var(--border); }
.byline__avatar { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; border: 1px solid var(--border); flex-shrink: 0; }
.byline__who { display: flex; flex-direction: column; gap: 1px; }
.byline__name { font-weight: 650; font-size: 0.98rem; color: var(--ink); text-decoration: none; }
.byline__name:hover { color: var(--accent); }
.byline__role { font-size: 0.82rem; color: var(--ink-4); }

/* ---------- prose ---------- */
.prose { font-size: 1.12rem; line-height: 1.72; color: var(--ink-2); }
.prose > * + * { margin-top: 1.3em; }
.prose h2 { margin-top: 2.1em; margin-bottom: 0.1em; color: var(--ink); }
.prose h3 { margin-top: 1.6em; margin-bottom: 0.1em; color: var(--ink); }
.prose p { margin: 0; }
.prose strong { color: var(--ink); font-weight: 650; }
.prose em { font-style: italic; }
.prose a { color: var(--accent-2); text-decoration: underline; text-decoration-color: var(--accent-glow); text-underline-offset: 2px; text-decoration-thickness: 1.5px; transition: text-decoration-color 140ms, color 140ms; }
.prose a:hover { color: var(--accent); text-decoration-color: var(--accent); }
.prose ul { margin: 1.2em 0; padding-left: 1.3em; }
.prose li { margin: 0.5em 0; padding-left: 0.2em; }
.prose li::marker { color: var(--accent); }
.prose code { font-family: var(--mono); font-size: 0.88em; background: var(--code-bg); color: var(--code-ink); padding: 0.15em 0.4em; border-radius: 5px; border: 1px solid var(--border); }
.prose pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 12px; padding: 18px 20px; overflow-x: auto; font-size: 0.95rem; line-height: 1.5; }
.prose pre code { background: none; border: none; padding: 0; font-size: 0.95em; color: var(--code-ink); }
.prose blockquote { margin: 1.4em 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--accent); color: var(--ink-2); font-style: italic; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2.4em 0; }

/* collapsed TL;DR recap (native <details>, no JS) */
.tldr { margin: 44px 0 0; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); overflow: hidden; scroll-margin-top: calc(var(--nav-h) + 16px); transition: border-color 200ms, box-shadow 200ms; }
.tldr:target { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.tldr:target .tldr__summary { color: var(--accent); }
.tldr__summary { list-style: none; cursor: pointer; user-select: none; position: relative;
  padding: 16px 46px 16px 20px; font-family: var(--mono); font-size: 12px; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); transition: color 120ms; }
.tldr__summary::-webkit-details-marker { display: none; }
.tldr__summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%);
  font-size: 22px; font-weight: 300; line-height: 1; color: var(--ink-3); transition: color 120ms; }
.tldr[open] .tldr__summary::after { content: "−"; color: var(--accent); }
.tldr__summary:hover { color: var(--accent); }
.tldr__summary:focus-visible { outline: 3px solid var(--accent-glow); outline-offset: -2px; border-radius: 12px; }
.tldr__body { padding: 4px 20px 20px; }
.tldr__body.prose { font-size: 1rem; line-height: 1.6; }
.tldr__body.prose > * + * { margin-top: 0.7em; }
.tldr__body.prose > *:first-child { margin-top: 0; }
.tldr__body.prose ul { margin: 0; padding-left: 1.2em; }
.tldr__body.prose li { margin: 0.35em 0; }

.post__end { border: none; border-top: 1px solid var(--border); margin: 48px 0 22px; }
.post__foot { font-size: 0.98rem; color: var(--ink-3); }
.post__foot a { color: var(--accent-2); text-decoration: underline; text-underline-offset: 2px; }
.post__foot a:hover { color: var(--accent); }

/* ---------- footer ---------- */
footer { flex-shrink: 0; padding: 34px 20px; color: var(--ink-3); font-size: 13.5px; border-top: 1px solid var(--border); background: var(--bg); }
@media (min-width: 760px) { footer { padding: 38px 32px; } }
.foot { max-width: var(--max); margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; align-items: baseline; }
.foot a { color: var(--ink-2); }
.foot a:hover { color: var(--accent); }
.foot__links { display: inline-flex; gap: 16px; flex-wrap: wrap; }
.foot__imprint { flex: 1 0 100%; font-size: 12px; color: var(--ink-4); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}