/* ─────────────────────────────────────────────────────────────
 * Frost Labs · /writing — shared stylesheet
 * Used by /writing/ index and individual post pages.
 * Inherits the homepage dark/mono aesthetic.
 * ───────────────────────────────────────────────────────────── */

/* Self-hosted JetBrains Mono Variable · SIL OFL 1.1 */
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/JetBrainsMono-Variable.woff2") format("woff2-variations"),
       url("/assets/fonts/JetBrainsMono-Variable.woff2") format("woff2");
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #0A0A0A;
  --bg-deep: #050505;
  --ink: #E8E5DE;
  --muted: #707068;
  --rule: #1F1F1D;
  --rule-hi: #2E2E2A;
  --amber: #F0A836;
  --amber-dim: #8C6422;
  --amber-soft: rgba(240, 168, 54, 0.08);

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(240, 168, 54, 0.25); color: var(--ink); }

/* Accessibility: keyboard focus */
*:focus { outline: none; }
*:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Top breadcrumb / nav */
.crumbs {
  position: sticky;
  top: 0;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--rule);
  padding: 10px 16px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  z-index: 50;
  display: flex;
  gap: 12px;
  align-items: center;
}
.crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.crumbs a:hover { color: var(--ink); border-bottom-color: var(--rule-hi); }
.crumbs .sep { color: var(--rule-hi); }
.crumbs .here { color: var(--ink); }

/* Page container — narrower for long-form reading */
.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 18px 64px;
}

/* ─── Writing index ─── */
.index-h1 {
  font-family: var(--mono);
  font-size: clamp(28px, 6vw, 44px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 8px;
}
.index-sub {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 40px;
  line-height: 1.6;
}

.post-list { margin: 16px 0; }
.post-entry {
  display: block;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  transition: padding-left 0.18s ease;
}
.post-entry:last-of-type { border-bottom: 1px solid var(--rule); }
.post-entry:hover { padding-left: 8px; }
.post-entry:hover .post-title { color: var(--amber); }
.post-entry .post-date {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--amber);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.post-entry .post-title {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
  margin-bottom: 6px;
  transition: color 0.18s ease;
}
.post-entry .post-desc {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: #B7B5AE;
}

/* ─── Individual post ─── */
.post-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.post-h1 {
  font-family: var(--mono);
  font-size: clamp(26px, 6vw, 38px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 16px;
}
.post-dek {
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.6;
  color: #B7B5AE;
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}

.post-body { margin-bottom: 40px; }
.post-body p {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink);
  margin-bottom: 18px;
}
.post-body p .lead4 {
  font-weight: 800;
  color: var(--ink);
}
.post-body h2 {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin: 40px 0 14px;
  padding-top: 8px;
}
.post-body h2 .prompt {
  color: var(--amber);
  margin-right: 6px;
}
.post-body h3 {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 800;
  color: var(--ink);
  margin: 28px 0 10px;
}

.post-body code {
  font-family: var(--mono);
  background: var(--amber-soft);
  color: var(--amber);
  padding: 1px 5px;
  border-radius: 2px;
  font-size: 0.92em;
}
.post-body pre {
  font-family: var(--mono);
  background: var(--bg-deep);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--amber);
  padding: 16px 18px;
  margin: 18px 0;
  font-size: 12.5px;
  line-height: 1.55;
  overflow-x: auto;
  color: var(--ink);
  border-radius: 0;
}
.post-body pre code {
  background: none;
  color: var(--ink);
  padding: 0;
  font-size: inherit;
}
.post-body pre .comment { color: var(--muted); }
.post-body pre .keyword { color: var(--amber); font-weight: 700; }
.post-body pre .string { color: #B7B5AE; }

.post-body ul, .post-body ol {
  margin: 0 0 18px 24px;
  font-size: 14px;
  line-height: 1.7;
}
.post-body li { margin-bottom: 6px; }

.post-body blockquote {
  margin: 18px 0;
  padding: 14px 18px;
  border-left: 2px solid var(--amber);
  background: var(--amber-soft);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink);
}
.post-body blockquote p:last-child { margin-bottom: 0; }

.post-body a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-dim);
}
.post-body a:hover { border-bottom-color: var(--amber); }

.post-body hr {
  border: none;
  height: 1px;
  background: var(--rule-hi);
  margin: 32px 0;
}

/* Tables in posts */
.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 13px;
  font-family: var(--mono);
}
.post-body th, .post-body td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}
.post-body th {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom-color: var(--rule-hi);
  padding-top: 6px;
}

/* Post CTA box at the end */
.post-cta {
  margin: 48px 0 24px;
  padding: 24px;
  border: 1px solid var(--rule-hi);
  background: var(--bg-deep);
}
.post-cta-head {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 12px;
}
.post-cta p {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink);
  margin-bottom: 16px;
}
.post-cta .actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  min-height: 44px;
  background: var(--amber);
  color: var(--bg);
  border: 1px solid var(--amber);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  text-align: center;
  transition: background 0.15s ease, color 0.15s ease;
}
.cta-button:hover {
  background: transparent;
  color: var(--amber);
}
.cta-text {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
}
.cta-text a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid var(--amber-dim);
}
.cta-text a:hover { border-bottom-color: var(--amber); }

/* Footer */
.post-footer {
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.05em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.post-footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.post-footer a:hover { color: var(--ink); border-bottom-color: var(--rule-hi); }
.post-footer .sep { color: var(--rule-hi); }

/* Tablet+ */
@media (min-width: 600px) {
  body { font-size: 15px; }
  .page { padding: 56px 24px 80px; }
  .crumbs { padding: 12px 22px; }
  .post-body p { font-size: 15px; }
  .post-body pre { font-size: 13px; }
  .post-body ul, .post-body ol { font-size: 15px; }
  .post-cta .actions { flex-direction: row; align-items: center; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .post-entry { transition: none; }
}