/* ===========================================================
   Resources — library + article styles
   Layers on top of base.css (shares all design tokens).
   =========================================================== */

/* ---------- shared page shell for sub-pages ---------- */
.subpage main { padding-top: 4.5rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ===========================================================
   Library (resources/index.html)
   =========================================================== */
.lib-intro { padding-block: clamp(2.5rem, 1.5rem + 4vw, 4.5rem) 1.5rem; }
.lib-intro .eyebrow { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-500); }
.lib-intro h1 { margin-top: 0.6rem; font-size: clamp(2rem, 1.5rem + 3vw, 3.4rem); line-height: 1.02; letter-spacing: -0.02em; }
.lib-intro p { margin-top: 1rem; max-width: 46ch; color: var(--ink-300); font-size: 1.02rem; line-height: 1.5; }

/* ---------- controls: search + tag filter ---------- */
.lib-controls { display: flex; flex-direction: column; gap: 1.1rem; padding-bottom: 1.8rem; border-bottom: 1px solid var(--line); }
.lib-search { position: relative; max-width: 30rem; }
.lib-search input {
  width: 100%; min-height: var(--tap); padding: 0.7rem 0.9rem 0.7rem 2.4rem;
  background: var(--bg-raised); border: 1px solid var(--line-strong); border-radius: var(--radius);
  color: var(--ink-100); font-family: var(--font-body); font-size: 0.95rem;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.lib-search input::placeholder { color: var(--ink-500); opacity: 0.65; }
.lib-search input:focus-visible { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-tint); }
.lib-search svg { position: absolute; left: 0.8rem; top: 50%; transform: translateY(-50%); width: 16px; height: 16px; stroke: var(--ink-500); pointer-events: none; }

.lib-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag-chip {
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-500); background: transparent; border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: 0.4rem 0.85rem; min-height: 34px; cursor: pointer; transition: all 0.2s var(--ease);
}
.tag-chip:hover { border-color: var(--accent); color: var(--ink-100); }
.tag-chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--bg-page); }
.tag-chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- tiles grid ---------- */
.lib-grid { display: grid; grid-template-columns: 1fr; gap: 1.1rem; padding-block: 2rem 4rem; }
@media (min-width: 640px) { .lib-grid { grid-template-columns: repeat(2, 1fr); gap: 1.3rem; } }
@media (min-width: 900px) { .lib-grid { grid-template-columns: repeat(3, 1fr); } }

.res-tile {
  display: flex; flex-direction: column; gap: 0.8rem;
  background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.3rem 1.3rem 1.4rem; min-height: 220px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.res-tile:hover { transform: translateY(-4px); border-color: var(--accent); }
.res-tile:focus-within { border-color: var(--accent); }
.res-tile .tile-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.res-tile .tile-tags span { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-500); border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 0.12rem 0.5rem; }
.res-tile h2 { font-size: 1.18rem; line-height: 1.15; letter-spacing: -0.01em; }
.res-tile h2 a { color: inherit; }
.res-tile h2 a::after { content: ""; position: absolute; inset: 0; }
.res-tile { position: relative; }
.res-tile p { color: var(--ink-300); font-size: 0.88rem; line-height: 1.5; flex: 1; }
.res-tile .tile-meta { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-500); }
.res-tile h2 a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.lib-empty { padding: 3rem 0; color: var(--ink-500); font-family: var(--font-mono); font-size: 0.9rem; }
.lib-empty[hidden] { display: none; }

@media (prefers-reduced-motion: reduce) { .res-tile { transition: border-color 0.2s var(--ease); } .res-tile:hover { transform: none; } }

/* ===========================================================
   Article (resources/<slug>/index.html)
   =========================================================== */
.article { padding-block: clamp(1.5rem, 1rem + 2vw, 3rem) 4rem; }
.article-inner { max-width: 46rem; margin-inline: auto; }

.breadcrumb { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--ink-500); display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; }
.breadcrumb a:hover { color: var(--ink-100); }
.breadcrumb span { opacity: 0.5; }

.article-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1.4rem; }
.article-tags a { font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-500); border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 0.15rem 0.6rem; }
.article-tags a:hover { border-color: var(--accent); color: var(--ink-100); }

.article h1 { margin-top: 1rem; font-size: clamp(1.9rem, 1.4rem + 3vw, 3rem); line-height: 1.05; letter-spacing: -0.02em; }
.article-byline { margin-top: 1.25rem; font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-500); display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem; }
.byline-author { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink-100); }
.byline-author img { width: 38px; height: 38px; border-radius: 50%; object-fit: cover; border: 1px solid var(--line-strong); background: var(--bg-raised); flex-shrink: 0; }

.tldr { margin-top: 2rem; background: var(--bg-raised); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: 1.2rem 1.3rem; }
.tldr .tldr-label { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-500); }
.tldr p, .tldr ul { margin-top: 0.5rem; color: var(--ink-300); font-size: 0.95rem; line-height: 1.55; }
.tldr ul { list-style: none; display: grid; gap: 0.4rem; }
.tldr ul li { padding-left: 1.1rem; position: relative; }
.tldr ul li::before { content: "→"; position: absolute; left: 0; color: var(--accent-em); }

.prose { margin-top: 2.4rem; }
.prose > * + * { margin-top: 1.15rem; }
.prose h2 { margin-top: 2.6rem; font-size: clamp(1.4rem, 1.2rem + 1vw, 1.85rem); line-height: 1.12; letter-spacing: -0.01em; }
.prose h3 { margin-top: 1.9rem; font-size: 1.15rem; line-height: 1.2; }
.prose p, .prose li { color: var(--ink-300); font-size: 1.02rem; line-height: 1.65; }
.prose a { color: var(--ink-100); text-decoration: underline; text-underline-offset: 2px; text-decoration-color: var(--line-strong); transition: text-decoration-color 0.2s var(--ease); }
.prose a:hover { text-decoration-color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.3rem; display: grid; gap: 0.5rem; }
.prose ul { list-style: none; padding-left: 0; }
.prose ul li { padding-left: 1.4rem; position: relative; }
.prose ul li::before { content: ""; position: absolute; left: 0.2rem; top: 0.7em; width: 6px; height: 6px; background: var(--accent-em); border-radius: 50%; }
.prose ol { list-style: decimal; padding-left: 1.4rem; }
.prose strong { color: var(--ink-100); font-weight: 600; }
.prose code { font-family: var(--font-mono); font-size: 0.86em; background: var(--accent-tint); border: 1px solid var(--line); border-radius: 3px; padding: 0.08em 0.36em; color: var(--ink-100); }
.prose blockquote { margin-left: 0; padding: 0.4rem 0 0.4rem 1.2rem; border-left: 3px solid var(--accent); font-family: var(--font-display); font-size: 1.2rem; line-height: 1.3; color: var(--ink-100); }
.prose .pull { font-family: var(--font-display); font-size: 1.3rem; line-height: 1.25; color: var(--ink-100); letter-spacing: -0.01em; }
.prose h2 + p, .prose h3 + p { margin-top: 0.7rem; }

/* soft CTA aside inside an article */
.soft-cta { margin-top: 2rem; background: var(--bg-raised); border: 1px dashed var(--line-strong); border-radius: var(--radius); padding: 1.2rem 1.3rem; }
.soft-cta p { color: var(--ink-300); font-size: 0.96rem; line-height: 1.55; }
.soft-cta p strong { color: var(--ink-100); }
.soft-cta a { color: var(--ink-100); text-decoration: underline; text-underline-offset: 2px; font-weight: 600; }

/* related reading + closing CTA */
.article-foot { max-width: 46rem; margin: 3.5rem auto 0; padding-top: 2.4rem; border-top: 1px solid var(--line); }
.related h2, .closing-cta h2 { font-size: 1.35rem; letter-spacing: -0.01em; }
.related-list { margin-top: 1.1rem; display: grid; gap: 0.8rem; }
.related-list a { display: block; background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.9rem 1.1rem; transition: border-color 0.2s var(--ease), transform 0.2s var(--ease); }
.related-list a:hover { border-color: var(--accent); transform: translateX(3px); }
.related-list .rl-tag { display: block; font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-500); }
.related-list .rl-title { display: block; margin-top: 0.4rem; font-size: 1.02rem; line-height: 1.25; color: var(--ink-100); }

.closing-cta { margin-top: 2.8rem; text-align: left; }
.closing-cta p { margin-top: 0.6rem; color: var(--ink-300); font-size: 1rem; line-height: 1.55; max-width: 42ch; }
.closing-cta .btn { margin-top: 1.2rem; }