/* 媧石皇家 demo 4 — article template (article.html?a=ID). Auravell blog-post layout, prefix r4-.
   Loaded after css/academy.css (shared card / eyebrow / CTA band). */

/* ---------- header ---------- */
.r4-hd { padding-top: calc(var(--hd-h) + clamp(80px, 8vw, 132px)); padding-bottom: clamp(56px, 6.4vw, 96px); }
.r4-crumb { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 28px; font-size: var(--fs-label); letter-spacing: .12em; color: var(--muted); }
.r4-crumb a:hover { color: var(--burgundy); }
.r4-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; font-size: var(--fs-body); letter-spacing: .04em; color: var(--burgundy); }
.r4-title { margin-top: clamp(20px, 2.4vw, 36px); max-width: 18em; font-size: clamp(2.1rem, 1.3rem + 3vw, 4.25rem); line-height: 1.22; letter-spacing: .03em; }
.r4-title .accent { color: var(--burgundy); }
.r4-archive { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 14px; margin-top: 28px; max-width: 46em; padding: 14px 18px; border-radius: var(--r); background: var(--sand); font-size: var(--fs-small); line-height: 1.75; color: var(--muted); }
.r4-archive__k { flex: none; padding: 2px 10px; border-radius: 6px; background: var(--burgundy); color: #fff; font-size: var(--fs-label); letter-spacing: .12em; }

/* ---------- two-column body: sticky author column + main ---------- */
.r4-grid { display: grid; grid-template-columns: minmax(0, 372px) minmax(0, 900px); grid-template-rows: 1fr auto; grid-template-areas: "side main" "next main"; justify-content: space-between; column-gap: clamp(40px, 6vw, 104px); padding-bottom: clamp(88px, 9vw, 140px); }
.r4-side { grid-area: side; }
.r4-main { grid-area: main; min-width: 0; }
.r4-next { grid-area: next; align-self: end; display: grid; justify-items: start; gap: 20px; padding-top: 56px; }
.r4-author { position: sticky; top: calc(var(--hd-h) + 32px); display: grid; gap: 0; }
.r4-side__k { font: 400 1.25rem/1.4 var(--f-serif); letter-spacing: .1em; }
.r4-author__name { margin-top: 12px; padding-bottom: 28px; border-bottom: 1px dashed #C9C2B8; font: 400 clamp(1.6rem, 1.3rem + .8vw, 2rem)/1.3 var(--f-zh-serif); letter-spacing: .12em; }
.r4-author__q { margin-top: 28px; font-size: var(--fs-body); line-height: 1.8; }
.r4-author__fig { position: relative; margin-top: 36px; }
.r4-author__fig img { width: 100%; aspect-ratio: 372 / 300; object-fit: cover; border-radius: var(--r) var(--r) var(--r) 120px; }
.r4-author__fig figcaption { margin-top: 10px; font-size: var(--fs-label); letter-spacing: .12em; color: var(--muted); }
.r4-toc { margin-top: 36px; }
.r4-toc ol { margin-top: 12px; border-top: 1px dashed #C9C2B8; }
.r4-toc a { display: flex; gap: 14px; padding: 10px 0; border-bottom: 1px dashed #C9C2B8; font-size: var(--fs-small); line-height: 1.55; color: var(--muted); transition: color .3s, padding .4s var(--ease); }
.r4-toc a .num { flex: none; color: var(--burgundy); }
.r4-toc a:hover, .r4-toc a[aria-current] { color: var(--ink); padding-left: 6px; }
.r4-toc a[aria-current] { font-weight: 500; }
.r4-next__k { font-size: var(--fs-body); letter-spacing: .06em; color: var(--burgundy); }
.r4-next__t { padding-bottom: 28px; border-bottom: 1px dashed #C9C2B8; font: 400 clamp(1.3rem, 1.1rem + .5vw, 1.6rem)/1.5 var(--f-serif); letter-spacing: .03em; color: var(--burgundy); transition: color .3s; }
.r4-next__t:hover { color: var(--ink); }

/* hero image (Auravell 900 × 560 rounded) — big photos fill, small ones sit on a cream mat at their own size */
.r4-fig { margin: 0; }
.r4-fig__frame { position: relative; overflow: hidden; border-radius: var(--r); aspect-ratio: 900 / 600; min-height: 0; background: var(--sand); display: grid; place-items: center; }
.r4-fig__frame img { width: auto; height: auto; max-width: min(100%, 560px); max-height: calc(100% - 64px); border-radius: 6px; box-shadow: 0 18px 40px rgba(23,24,26,.12); }
.r4-fig--big .r4-fig__frame img { width: 100%; height: 100%; max-width: none; max-height: none; object-fit: cover; border-radius: 0; box-shadow: none; }
.r4-fig__cap { margin-top: 12px; font-size: var(--fs-label); letter-spacing: .1em; color: var(--muted); }

/* ---------- body typography ---------- */
.r4-body { margin-top: clamp(56px, 6vw, 96px); max-width: 900px; color: var(--muted); font-size: 1.0625rem; line-height: 1.95; }
.r4-body > * + * { margin-top: 1.3em; }
.r4-body a.r4-url { color: var(--burgundy); text-decoration: underline; text-underline-offset: 3px; word-break: break-all; }
.r4-h2 { margin-top: 1.8em !important; font-size: clamp(1.6rem, 1.15rem + 1.5vw, 2.5rem); line-height: 1.35; letter-spacing: .03em; color: var(--ink); scroll-margin-top: 120px; }
.r4-body > .r4-h2:first-child { margin-top: 0 !important; }
.r4-h2 small, .r4-h3 small { display: block; margin-top: 6px; font: italic 400 1rem/1.4 var(--f-accent); letter-spacing: .02em; color: var(--burgundy); }
.r4-h3 { margin-top: 1.7em !important; font-size: clamp(1.2rem, 1.05rem + .5vw, 1.5rem); line-height: 1.5; color: var(--ink); }
.r4-h3--label { font-size: 1.125rem; color: var(--burgundy); }
.r4-ul li { position: relative; padding-left: 20px; color: var(--ink); }
.r4-ul li + li { margin-top: 8px; }
.r4-ul li::before { content: ""; position: absolute; left: 2px; top: .85em; width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.r4-ol li { display: flex; gap: 12px; }
.r4-ol li + li { margin-top: 10px; }
.r4-ol__n { flex: none; min-width: 1.6em; color: var(--burgundy); }
.r4-ol p, .r4-steps p { color: var(--ink); }
.r4-steps { counter-reset: s; border-top: 1px dashed #C9C2B8; }
.r4-steps li { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 16px; padding: 18px 0; border-bottom: 1px dashed #C9C2B8; }
.r4-steps__n { font-size: 1.5rem; line-height: 1.4; color: var(--burgundy); }
.r4-qa { padding: 22px 24px; border-radius: var(--r); background: #fff; }
.r4-qa__q, .r4-qa__a { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 12px; }
.r4-qa__q { color: var(--ink); font-weight: 500; }
.r4-qa__a { margin-top: 10px; }
.r4-qa b { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 6px; background: var(--burgundy-tint); color: var(--burgundy); font: 500 .875rem/1 var(--f-zh-serif); }
.r4-qa__q b { background: var(--burgundy); color: #fff; }
.r4-qa__a p + p { margin-top: .6em; }
.r4-callout { display: flex; gap: 12px; padding: 16px 20px; border-left: 2px solid var(--burgundy); background: var(--sand); border-radius: 0 var(--r) var(--r) 0; font-size: var(--fs-small); }
.r4-callout b { color: var(--burgundy); }
.r4-verse { padding: clamp(24px, 3vw, 40px); border-radius: var(--r); background: var(--sand); font: 400 1.125rem/2.1 var(--f-zh-serif); letter-spacing: .08em; color: var(--ink); }
.r4-verse p + p { margin-top: 1.4em; }
.r4-sign { margin-top: 2.4em !important; padding: clamp(24px, 3vw, 36px); border-radius: var(--r); background: var(--burgundy-deep); color: var(--on-dark); font: 400 1.125rem/1.9 var(--f-zh-serif); letter-spacing: .05em; }
.r4-sign p + p { margin-top: .8em; }
.r4-sign footer { margin-top: 18px; font: 400 var(--fs-label)/1 var(--f-sans); letter-spacing: .2em; color: var(--on-dark-muted); }
.r4-disc { padding-top: 20px; border-top: 1px dashed #C9C2B8; font-size: var(--fs-label); line-height: 1.8; letter-spacing: .04em; }
.r4-empty { padding: 28px; border-radius: var(--r); background: var(--sand); color: var(--ink); }

/* share */
.r4-share { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 24px; margin-top: clamp(48px, 5vw, 72px); padding-block: 24px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.r4-share__k { font: 400 1.25rem/1.4 var(--f-serif); letter-spacing: .1em; color: var(--ink); }
.r4-share__row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.r4-share__b { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 16px; border-radius: var(--r); background: #fff; font-size: var(--fs-small); letter-spacing: .06em; color: var(--ink); box-shadow: inset 0 0 0 1px rgba(42,43,47,.06); transition: background-color .3s, color .3s; }
.r4-share__b svg { width: 18px; height: 18px; }
.r4-share__b:hover { background: var(--burgundy); color: #fff; }
.r4-share__ok { font-size: var(--fs-label); color: var(--burgundy); letter-spacing: .08em; }

/* related */
.r4-rel { padding-bottom: clamp(96px, 10vw, 160px); }
.r4-rel__head { display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; gap: 24px; margin-bottom: clamp(36px, 4.4vw, 64px); padding-top: clamp(64px, 7vw, 112px); border-top: 1px dashed #C9C2B8; }
.r4-rel__head > div { display: grid; gap: 16px; }
.r4-rel__h { font-size: clamp(2rem, 1.3rem + 2.4vw, 3.5rem); line-height: 1.25; letter-spacing: .03em; }
.r4-rel__h .accent { color: var(--burgundy); }

/* not found */
.r4-404 { padding-top: calc(var(--hd-h) + clamp(96px, 10vw, 160px)); padding-bottom: clamp(72px, 8vw, 120px); }
.r4-404__p { margin-top: 24px; max-width: 34em; color: var(--muted); font-size: var(--fs-lead); }
.r4-404__btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .r4-grid { grid-template-columns: minmax(0, 280px) minmax(0, 1fr); column-gap: 48px; }
  .r4-author__fig img { border-bottom-left-radius: 90px; }
}
@media (max-width: 991px) {
  /* Auravell mobile order: content first, then the author card, then next post */
  .r4-grid { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto; grid-template-areas: "main" "side" "next"; }
  .r4-side { margin-top: 64px; }
  .r4-author { position: static; grid-template-columns: minmax(0, 200px) minmax(0, 1fr); grid-template-areas: "fig k" "fig name" "fig q"; align-content: center; column-gap: 24px; align-items: start; }
  .r4-author > .r4-side__k { grid-area: k; align-self: end; }
  .r4-author__name { grid-area: name; padding-bottom: 18px; }
  .r4-author__q { grid-area: q; margin-top: 18px; }
  .r4-author__fig { grid-area: fig; margin-top: 0; }
  .r4-author__fig img { aspect-ratio: 200 / 260; border-bottom-left-radius: 64px; }
  .r4-toc { display: none; }
  .r4-next { padding-top: 48px; }
}
@media (max-width: 640px) {
  .r4-hd { padding-top: calc(var(--hd-h) + 56px); }
  .r4-meta { font-size: var(--fs-small); }
  .r4-fig__frame { aspect-ratio: 4 / 3.4; }
  .r4-fig__frame img { max-height: calc(100% - 40px); max-width: calc(100% - 40px); }
  .r4-body { font-size: 1rem; }
  .r4-author { grid-template-columns: minmax(0, 132px) minmax(0, 1fr); column-gap: 18px; }
  .r4-author__fig img { border-bottom-left-radius: 48px; }
  .r4-author__fig figcaption { font-size: .75rem; }
  .r4-qa { padding: 18px 16px; }
  .r4-steps li { grid-template-columns: 40px minmax(0, 1fr); gap: 12px; }
  .r4-share { flex-direction: column; align-items: flex-start; }
}