/* Pwfolk — one stylesheet, mobile first. Column widths mirror a typical
   article site: 680 px reading column, 300 px rail from 1100 px. */
:root {
  --ink: #1d2b26;
  --ink-soft: #4d5e58;
  --muted: #7a8a84;
  --line: #e2e8e5;
  --paper: #fbfaf6;
  --card: #ffffff;
  --brand: #2f6b5e;
  --brand-dark: #214d43;
  --accent: #e8862b;
  --radius: 14px;
  --wrap: 1180px;
  --column: 680px;
  --rail: 300px;
  --font: "Georgia", "Times New Roman", serif;
  --ui: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.65 var(--font); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand); }
h1, h2, h3 { font-family: var(--ui); line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 0.5em; }
h1 { font-size: clamp(28px, 5vw, 44px); }
h2 { font-size: clamp(22px, 3.2vw, 28px); margin-top: 1.6em; }
h3 { font-size: 19px; margin-top: 1.3em; }
p { margin: 0 0 1.15em; }
.wrap { width: min(100% - 32px, var(--wrap)); margin-inline: auto; }
.muted { color: var(--muted); }
.eyebrow { font: 600 12px/1 var(--ui); letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin: 0 0 10px; }
.lead { font-size: 19px; color: var(--ink-soft); }
.button { display: inline-block; padding: 12px 20px; border-radius: 999px; background: var(--brand); color: #fff; font: 600 15px var(--ui); text-decoration: none; }
.button:hover { background: var(--brand-dark); }

/* header */
.site-header { background: var(--paper); border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: center; gap: 16px; min-height: 60px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font: 700 22px var(--ui); color: var(--brand-dark); text-decoration: none; }
.brand-mark { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--brand); color: #fff; }
.site-nav { display: none; }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.saved-toggle, .menu-toggle, .save-button, .back-to-top { font: 600 14px var(--ui); color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px; cursor: pointer; }
.saved-toggle .count { display: inline-grid; place-items: center; min-width: 20px; height: 20px; margin-left: 4px; padding: 0 5px; border-radius: 10px; background: var(--brand); color: #fff; font-size: 12px; }
.saved-panel { padding: 12px 0 16px; border-top: 1px solid var(--line); }
.saved-panel[hidden] { display: none; }
.saved-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.saved-list a { font-family: var(--ui); font-size: 15px; }
.saved-empty { margin: 0; font: 14px var(--ui); color: var(--muted); }
.saved-list:not(:empty) + .saved-empty, .saved-panel:has(.saved-list:not(:empty)) .saved-empty { display: none; }
.nav-link { font: 600 15px var(--ui); color: var(--ink-soft); text-decoration: none; padding: 8px 10px; border-radius: 8px; }
.nav-link:hover, .nav-link.active { color: var(--brand-dark); background: #e9f1ee; }
@media (min-width: 900px) {
  .site-nav { display: flex; gap: 2px; flex-wrap: wrap; }
}
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ad hosts: empty until the study fills them; no reserved height so a no-fill leaves no gap */
.ad-host { display: block; }
.ad-host:empty { display: none; }
.ad-host-leaderboard { display: none; }
@media (min-width: 900px) {
  .ad-host-leaderboard { display: flex; justify-content: center; align-items: center; position: sticky; top: 0; z-index: 45; min-height: 90px; background: var(--paper); }
}
.ad-host-rail { margin: 0 0 24px; }
.ad-host-rail:empty { display: none; }
.ad-host-in-article, .ad-host-in-article-video, .ad-host-end { margin: 28px 0; }

/* home */
.opener { padding: 36px 0 12px; border-bottom: 3px solid var(--brand); margin-bottom: 24px; }
.wordmark { font-size: clamp(56px, 16vw, 120px); line-height: 0.95; letter-spacing: -0.04em; color: var(--brand); margin: 0 0 8px; }
.wordmark sup { font-size: 0.25em; vertical-align: top; }
.opener .lead { margin-bottom: 20px; }
.opener .topic-list { list-style: none; margin: 0 0 20px; padding: 0; display: grid; gap: 10px; }
.opener .topic-list a { font: 700 18px var(--ui); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink); text-decoration: none; }
.card-feed { display: grid; gap: 28px; }
.card-category-overlay { position: absolute; left: 14px; top: 14px; padding: 6px 10px; border-radius: 6px; background: rgb(29 43 38 / 72%); color: #fff; }
.card-art { position: relative; display: block; }
.post-card { display: grid; grid-template-rows: auto 1fr; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-decoration: none; color: inherit; transition: transform 160ms ease, box-shadow 160ms ease; }
.post-card:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgb(29 43 38 / 10%); }
.card-art img { aspect-ratio: 16 / 10; object-fit: cover; width: 100%; }
.card-body { display: grid; gap: 6px; padding: 14px 16px 18px; }
.card-category { font: 600 12px var(--ui); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
.card-title { font: 700 20px/1.25 var(--ui); color: var(--ink); }
.card-excerpt { color: var(--ink-soft); font-size: 15px; line-height: 1.5; }
.card-meta { font: 13px var(--ui); color: var(--muted); }
.post-card-large .card-title { font-size: 26px; }
.card-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
@media (min-width: 900px) {
  .opener { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 24px; }
  .opener .topic-list { grid-template-columns: repeat(2, 1fr); }
  .card-feed { grid-template-columns: repeat(2, 1fr); }
  .card-feed .post-card-large { grid-column: 1 / -1; }
}

/* category / content pages */
.page-heading { padding: 32px 0 16px; }
.prose-page { padding: 32px 0 48px; }
.prose { max-width: var(--column); }
.empty { padding: 32px 0; }

/* article */
.article-layout { display: grid; gap: 40px; padding: 24px 0 48px; }
.post { max-width: var(--column); min-width: 0; }
.post-category { margin: 24px 0 8px; }
.post-category a { font: 700 13px var(--ui); letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); text-decoration: none; }
.post h1 { font-size: clamp(34px, 9vw, 64px); text-transform: uppercase; letter-spacing: -0.03em; line-height: 0.98; }
.post-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 14px; font: 700 13px/1.4 var(--ui); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); margin: 18px 0 16px; }
.post-kicker { font-weight: 600; }
.save-button { display: inline-flex; align-items: center; gap: 6px; }
.save-button { border: 2px solid var(--ink); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; font-size: 13px; padding: 10px 18px; }
.save-button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.post-hero { margin: 24px calc(50% - 50vw) 0; }
.post-hero img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
@media (min-width: 700px) { .post-hero { margin: 24px 0 0; } .post-hero img { border-radius: var(--radius); } }
.post-excerpt { font-size: 20px; color: var(--ink-soft); margin: 20px 0 12px; }
.post-body p { font-size: 18px; }
.post-figure { margin: 28px 0; }
.post-figure img { border-radius: 10px; width: 100%; }
.post-figure figcaption { font: 14px var(--ui); color: var(--muted); margin-top: 8px; }
.post-faq { margin-top: 40px; border-top: 1px solid var(--line); padding-top: 8px; }
.post-faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.post-faq summary { cursor: pointer; font: 600 17px var(--ui); padding: 12px 0; list-style: none; position: relative; padding-right: 28px; }
.post-faq summary::-webkit-details-marker { display: none; }
.post-faq summary::after { content: "+"; position: absolute; right: 4px; top: 10px; font-size: 20px; color: var(--muted); }
.post-faq details[open] summary::after { content: "\2013"; }
.post-faq p { padding-bottom: 12px; font-size: 16px; }
.post-nav { display: grid; gap: 12px; margin-top: 32px; }
.post-nav-link { display: grid; gap: 2px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); text-decoration: none; color: var(--ink); font: 600 15px/1.35 var(--ui); }
.post-nav-link .muted { font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; }
.rail { min-width: 0; }
.related { display: grid; gap: 12px; }
.related-item { display: grid; grid-template-columns: 120px 1fr; gap: 12px; align-items: center; text-decoration: none; color: inherit; }
.related-item img { border-radius: 8px; aspect-ratio: 16 / 9; object-fit: cover; width: 100%; }
.related-title { display: block; font: 600 15px/1.3 var(--ui); color: var(--ink); }
@media (min-width: 700px) { .post-nav { grid-template-columns: 1fr 1fr; } .post-nav-link.next { text-align: right; } }
@media (min-width: 1100px) {
  .article-layout { grid-template-columns: var(--column) var(--rail); justify-content: space-between; }
  .rail { position: sticky; top: 84px; align-self: start; }
}

/* footer, back to top, progress */
.site-footer { border-top: 1px solid var(--line); margin-top: 32px; padding: 32px 0 48px; font-family: var(--ui); font-size: 14px; }
.footer-row { display: grid; gap: 12px; }
.brand-foot { font-weight: 700; margin: 0; }
.site-footer nav a { color: var(--ink-soft); }
.back-to-top { position: fixed; right: 16px; bottom: 76px; z-index: 30; width: 44px; height: 44px; padding: 0; font-size: 18px; box-shadow: 0 6px 18px rgb(0 0 0 / 15%); }
.back-to-top[hidden] { display: none; }
body:has(#h5-study-anchor[data-position="bottom"]) .back-to-top { bottom: 300px; }
.reading-progress { position: fixed; left: 0; right: 0; top: 0; height: 3px; z-index: 50; pointer-events: none; }
.reading-progress span { display: block; height: 100%; width: 0; background: var(--accent); transition: width 80ms linear; }
body:not(.page-article) .reading-progress { display: none; }