/* Long-form guide pages (e.g. /research-internship-guide). Uses the site.css colour tokens. */
.article-top { border-bottom: 1px solid var(--border); background: var(--surface); }
.article-hero { max-width: 1120px; margin: 0 auto; padding: 56px 20px 40px; }
.article-hero .eyebrow { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.82rem; font-weight: 600; color: var(--text-2); background: var(--soft); border: 1px solid var(--border); border-radius: 999px; padding: 5px 12px; }
.article-hero h1 { font-size: clamp(2rem, 5vw, 3.1rem); line-height: 1.1; letter-spacing: -1px; margin: 1rem 0 0.9rem; max-width: 900px; }
.article-hero .lead { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--text-2); max-width: 760px; margin: 0 0 1.2rem; line-height: 1.6; }
.article-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 1.2rem; color: var(--muted); font-size: 0.88rem; }
.article-meta i { margin-right: 0.3rem; }

.article-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-top: 1.8rem; max-width: 900px; }
.article-stat { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; }
.article-stat b { display: block; font-size: 1.55rem; letter-spacing: -0.5px; color: var(--text); }
.article-stat span { font-size: 0.85rem; color: var(--text-2); }

.article-layout { max-width: 1120px; margin: 0 auto; padding: 40px 20px 80px; display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 48px; align-items: start; }
.article-toc { position: sticky; top: 84px; max-height: calc(100vh - 110px); overflow-y: auto; font-size: 0.88rem; border-left: 1px solid var(--border); padding-left: 14px; }
.article-toc h2 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.8px; color: var(--muted); margin: 0 0 0.7rem; }
.article-toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.article-toc li { margin: 0 0 0.45rem; counter-increment: toc; }
.article-toc a { color: var(--text-2); text-decoration: none; display: block; line-height: 1.35; }
.article-toc a::before { content: counter(toc) ". "; color: var(--muted); }
.article-toc a:hover { color: var(--text); }

.article { max-width: 760px; min-width: 0; font-size: 1.04rem; line-height: 1.75; }
.article h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); letter-spacing: -0.4px; line-height: 1.25; margin: 3.2rem 0 0.9rem; scroll-margin-top: 84px; }
.article h2:first-child { margin-top: 0; }
.article h3 { font-size: 1.15rem; margin: 2rem 0 0.5rem; letter-spacing: -0.2px; scroll-margin-top: 84px; }
.article p, .article li { color: var(--text-2); }
.article strong { color: var(--text); }
.article ul, .article ol { padding-left: 1.3rem; }
.article li { margin-bottom: 0.45rem; }
.article a { color: var(--text); text-underline-offset: 3px; }
.article hr { border: 0; border-top: 1px solid var(--border); margin: 3rem 0; }

.callout { background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--text); border-radius: 10px; padding: 14px 18px; margin: 1.4rem 0; }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.callout-title { display: block; font-weight: 700; color: var(--text); margin-bottom: 0.3rem; }
.callout.is-warn { border-left-color: #d97706; }
.callout.is-good { border-left-color: var(--ok); }

.email-sample { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); margin: 1.4rem 0; overflow: hidden; }
.email-sample-head { background: var(--soft); border-bottom: 1px solid var(--border); padding: 10px 16px; font-size: 0.86rem; color: var(--text-2); }
.email-sample-head div { margin: 2px 0; overflow-wrap: anywhere; }
.email-sample-head b { color: var(--text); font-weight: 600; display: inline-block; min-width: 68px; }
.email-sample-body { padding: 16px 18px; white-space: pre-wrap; font-size: 0.95rem; line-height: 1.65; color: var(--text); overflow-wrap: anywhere; }
.email-sample-label { display: inline-block; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.5px; text-transform: uppercase; padding: 2px 8px; border-radius: 999px; margin-right: 0.4rem; }
.email-sample-label.good { background: rgba(21, 128, 61, 0.12); color: var(--ok); }
.email-sample-label.bad { background: rgba(220, 38, 38, 0.12); color: #dc2626; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 1.2rem 0; }
.compare > div { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px 16px; font-size: 0.95rem; }
.compare h4 { margin: 0 0 0.4rem; font-size: 0.9rem; }
.compare ul { margin: 0; padding-left: 1.1rem; }

.table-wrap { overflow-x: auto; margin: 1.2rem 0; border: 1px solid var(--border); border-radius: 12px; }
.article table { width: 100%; border-collapse: collapse; font-size: 0.92rem; background: var(--surface); }
.article th, .article td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.article th { background: var(--soft); color: var(--text); font-weight: 600; white-space: nowrap; }
.article tr:last-child td { border-bottom: 0; }

.cv-sample { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; margin: 1.4rem 0; font-size: 0.92rem; line-height: 1.55; }
.cv-sample .cv-name { font-size: 1.25rem; font-weight: 700; color: var(--text); margin: 0; }
.cv-sample .cv-contact { color: var(--muted); margin: 0 0 0.8rem; overflow-wrap: anywhere; }
.cv-sample h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.8px; border-bottom: 1px solid var(--border); padding-bottom: 3px; margin: 1rem 0 0.45rem; color: var(--text); }
.cv-sample p, .cv-sample li { margin: 0 0 0.25rem; color: var(--text-2); }
.cv-sample ul { padding-left: 1.1rem; margin: 0; }
.cv-row { display: flex; justify-content: space-between; gap: 1rem; }
.cv-row span:last-child { color: var(--muted); white-space: nowrap; }

.checklist { list-style: none; padding-left: 0 !important; }
.checklist li { position: relative; padding-left: 1.9rem; }
.checklist li::before { content: ""; position: absolute; left: 0; top: 0.35em; width: 1.05rem; height: 1.05rem; border: 2px solid var(--text-2); border-radius: 4px; }

.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px 16px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 600; color: var(--text); }
.faq details p { margin: 0.6rem 0 0; }

.article-end { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9rem; }

@media (max-width: 900px) {
  .article-layout { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-top: 28px; }
  .article-toc { position: static; max-height: none; border-left: 0; padding: 14px 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
  .compare { grid-template-columns: 1fr; }
  .cv-row { flex-direction: column; gap: 0; }
}
.article .small { font-size: 0.85rem; color: var(--muted); margin-top: -0.4rem; }