:root {
  color-scheme: light;
  --bg: #fbfaf8;
  --card: #ffffff;
  --ink: #16161a;
  --muted: #686872;
  --line: #deddd9;
  --soft: #f1f0ec;
  --accent: #315b4c;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a { color: inherit; }

.wrap {
  width: min(100% - 40px, 1100px);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
}

.site-header .wrap {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { font-weight: 750; text-decoration: none; letter-spacing: -0.02em; }
.site-nav { display: flex; flex-wrap: wrap; gap: 18px; }
.site-nav a { color: var(--muted); font-size: 0.92rem; text-decoration: none; }
.site-nav a:hover { color: var(--ink); }

.hero { padding: 88px 0 64px; border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0 0 12px; color: var(--accent); font: 700 0.76rem/1.3 ui-monospace, monospace; letter-spacing: 0.09em; text-transform: uppercase; }
h1 { max-width: 880px; margin: 0; font-size: clamp(2.35rem, 6vw, 5rem); line-height: 0.98; letter-spacing: -0.055em; }
.lede { max-width: 760px; margin: 24px 0 0; color: var(--muted); font-size: 1.16rem; }

.article-list { display: grid; gap: 18px; padding: 48px 0 84px; }
.article-card { display: grid; gap: 12px; padding: 28px; border: 1px solid var(--line); border-radius: 20px; background: var(--card); text-decoration: none; }
.article-card:hover { border-color: #aaa9a5; }
.article-card h2 { margin: 0; font-size: clamp(1.45rem, 3vw, 2.15rem); line-height: 1.15; letter-spacing: -0.025em; }
.article-card p { max-width: 760px; margin: 0; color: var(--muted); }
.meta { color: var(--muted); font-size: 0.86rem; }

.article-shell { display: grid; grid-template-columns: minmax(0, 760px) 240px; gap: 72px; align-items: start; padding: 72px 0 96px; }
.article-main h1 { font-size: clamp(2.5rem, 6vw, 4.7rem); }
.article-main h2 { margin: 3.2rem 0 0.7rem; font-size: clamp(1.6rem, 3vw, 2.15rem); line-height: 1.15; letter-spacing: -0.025em; }
.article-main h3 { margin: 2rem 0 0.5rem; font-size: 1.15rem; }
.article-main p, .article-main li { color: #35353b; }
.article-main ul, .article-main ol { padding-left: 1.3rem; }
.article-main li + li { margin-top: 0.55rem; }
.article-main table { width: 100%; border-collapse: collapse; margin: 1.4rem 0 2rem; font-size: 0.93rem; }
.article-main th, .article-main td { padding: 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.article-main th { background: var(--soft); }
.summary { margin: 30px 0; padding: 22px; border-left: 4px solid var(--accent); background: var(--soft); }
.summary p { margin: 0; }
.toc { position: sticky; top: 92px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: var(--card); }
.toc strong { display: block; margin-bottom: 10px; }
.toc a { display: block; padding: 5px 0; color: var(--muted); font-size: 0.88rem; text-decoration: none; }
.toc a:hover { color: var(--ink); }
.source-list a { text-decoration-thickness: 1px; text-underline-offset: 3px; }
.site-footer { padding: 32px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.86rem; }

@media (max-width: 820px) {
  .article-shell { grid-template-columns: 1fr; gap: 30px; }
  .toc { position: static; order: -1; }
}

@media (max-width: 620px) {
  .site-header .wrap { align-items: flex-start; flex-direction: column; padding-block: 14px; }
  .hero { padding-top: 56px; }
  .article-card { padding: 22px; }
  .article-main table { display: block; overflow-x: auto; }
}