:root {
  --paper: #f5f1e8;
  --paper-2: #ece6da;
  --ink: #17191d;
  --muted: #696b70;
  --line: #cbc3b5;
  --blue: #174d93;
  --rust: #b64127;
  --card: rgba(255, 255, 255, 0.45);
  --shadow: 0 18px 50px rgba(49, 39, 24, 0.08);
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, serif;
}

[data-theme="dark"] {
  --paper: #17191d;
  --paper-2: #202329;
  --ink: #f3eee5;
  --muted: #b7b2aa;
  --line: #3d4149;
  --blue: #7fb2f0;
  --rust: #e1775f;
  --card: rgba(255, 255, 255, 0.035);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.2);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 10% 0%, color-mix(in srgb, var(--rust) 8%, transparent), transparent 30rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 0.22em; }
a:hover { color: var(--rust); }

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
}
.skip-link:focus { top: 1rem; }

.shell { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }
.reading-shell { width: min(760px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(14px);
}

.header-inner { min-height: 72px; display: flex; align-items: center; gap: 2rem; }
.brand { color: var(--ink); font: 800 1.05rem/1 var(--sans); text-decoration: none; letter-spacing: 0.08em; }
.brand-mark { display: inline-block; width: 0.72rem; height: 0.72rem; margin-right: 0.58rem; border-radius: 50%; background: var(--rust); }
.nav { display: flex; align-items: center; gap: 1.35rem; margin-left: auto; }
.nav a { color: var(--muted); font-size: 0.92rem; text-decoration: none; }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 700; }
.icon-button, .menu-button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  min-width: 38px;
  min-height: 38px;
}
.menu-button { display: none; padding: 0.25rem 0.8rem; }

.hero { padding: clamp(4rem, 9vw, 8rem) 0 3.8rem; }
.hero-grid { display: grid; grid-template-columns: 170px minmax(0, 1fr); gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.portrait {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper-2);
  box-shadow: var(--shadow);
  color: var(--rust);
  font: 800 clamp(3rem, 8vw, 5.5rem)/1 var(--serif);
}
.eyebrow { margin: 0 0 0.8rem; color: var(--rust); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; }
h1, h2, h3 { margin-top: 0; line-height: 1.22; }
h1 { margin-bottom: 1rem; font: 800 clamp(2.8rem, 8vw, 5.5rem)/1.08 var(--serif); letter-spacing: -0.035em; }
.hero .tagline { max-width: 28ch; margin: 0 0 1.2rem; color: var(--muted); font: 500 clamp(1.25rem, 3vw, 1.65rem)/1.55 var(--serif); }
.hero .intro { max-width: 42rem; margin: 0; }
.hero-links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.7rem; }
.button-link { display: inline-flex; align-items: center; min-height: 44px; padding: 0.55rem 1rem; border: 1px solid var(--ink); color: var(--ink); text-decoration: none; }
.button-link.primary { background: var(--ink); color: var(--paper); }
.button-link:hover { border-color: var(--rust); color: var(--rust); }
.button-link.primary:hover { background: var(--rust); color: white; }

.section { padding: 3.4rem 0; border-top: 1px solid var(--line); }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 1.8rem; }
.section-heading h2 { margin: 0; font: 800 clamp(1.7rem, 4vw, 2.4rem)/1.2 var(--serif); }
.section-heading a { font-size: 0.9rem; }

.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.fact { min-height: 130px; padding: 1.15rem; background: var(--paper); }
.fact dt { margin-bottom: 0.55rem; color: var(--muted); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.fact dd { margin: 0; font-family: var(--serif); line-height: 1.55; }

.post-list { list-style: none; margin: 0; padding: 0; }
.post-row { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr) auto; gap: 1.3rem; align-items: baseline; padding: 1.4rem 0; border-top: 1px solid var(--line); }
.post-row:last-child { border-bottom: 1px solid var(--line); }
.post-date { color: var(--muted); font-size: 0.83rem; font-variant-numeric: tabular-nums; }
.post-title { margin: 0 0 0.35rem; font: 700 clamp(1.15rem, 3vw, 1.45rem)/1.35 var(--serif); }
.post-title a { color: var(--ink); text-decoration: none; }
.post-title a:hover { color: var(--rust); }
.post-summary { margin: 0; color: var(--muted); font-size: 0.93rem; }
.category { color: var(--rust); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.08em; }

.page-head { padding: 5rem 0 2.5rem; }
.page-head h1 { font-size: clamp(2.5rem, 7vw, 4.8rem); }
.page-head p { max-width: 42rem; color: var(--muted); font: 500 1.2rem/1.7 var(--serif); }
.filter-bar { display: flex; flex-wrap: wrap; gap: 0.65rem; margin: 0 0 2rem; }
.filter-button { padding: 0.45rem 0.8rem; border: 1px solid var(--line); border-radius: 999px; background: transparent; color: var(--ink); cursor: pointer; font: inherit; font-size: 0.85rem; }
.filter-button.active { border-color: var(--ink); background: var(--ink); color: var(--paper); }
.post-row[hidden] { display: none; }

.article { padding: 5rem 0 6rem; }
.article-header { padding-bottom: 2rem; border-bottom: 1px solid var(--line); }
.article-kicker { display: flex; gap: 1rem; color: var(--muted); font-size: 0.82rem; }
.article h1 { margin: 0.7rem 0 1rem; font-size: clamp(2.3rem, 7vw, 4.6rem); }
.article-dek { margin: 0; color: var(--muted); font: 500 1.2rem/1.7 var(--serif); }
.prose { padding-top: 2rem; font-family: var(--serif); }
.prose p, .prose ul, .prose ol, .prose blockquote { margin: 1.25rem 0; }
.prose h2 { margin: 2.7rem 0 0.8rem; font-size: 1.65rem; }
.prose h3 { margin: 2.2rem 0 0.7rem; font-size: 1.3rem; }
.prose blockquote { margin-left: 0; padding: 0.5rem 0 0.5rem 1.25rem; border-left: 3px solid var(--rust); color: var(--muted); }
.prose code { padding: 0.14em 0.34em; background: var(--paper-2); font-size: 0.88em; }
.prose pre { overflow-x: auto; padding: 1rem; background: #11151b; color: #f2f0ea; }
.article-footer { margin-top: 3.5rem; padding-top: 1.4rem; border-top: 1px solid var(--line); }

.timeline { position: relative; margin: 0; padding: 0; list-style: none; }
.timeline::before { content: ""; position: absolute; left: 6.5rem; top: 0.7rem; bottom: 0.7rem; width: 1px; background: var(--line); }
.timeline li { display: grid; grid-template-columns: 5rem minmax(0, 1fr); gap: 3rem; position: relative; padding: 0 0 2rem; }
.timeline li::before { content: ""; position: absolute; left: 6.18rem; top: 0.65rem; width: 0.7rem; height: 0.7rem; border-radius: 50%; background: var(--rust); }
.timeline time { color: var(--muted); font-size: 0.85rem; }
.timeline h3 { margin: 0 0 0.2rem; font-family: var(--serif); }
.timeline p { margin: 0; color: var(--muted); }

.site-footer { padding: 2.4rem 0 3.4rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.84rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 2rem; }
.footer-inner p { margin: 0; }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .header-inner { min-height: 64px; }
  .menu-button { display: inline-flex; align-items: center; }
  .nav { display: none; position: absolute; left: 20px; right: 20px; top: 64px; flex-direction: column; align-items: stretch; gap: 0; padding: 0.6rem; border: 1px solid var(--line); background: var(--paper); box-shadow: var(--shadow); }
  .nav.open { display: flex; }
  .nav a { padding: 0.65rem 0.8rem; }
  .hero { padding-top: 3.5rem; }
  .hero-grid { grid-template-columns: 90px minmax(0, 1fr); gap: 1.3rem; }
  .hero-copy { grid-column: 1 / -1; }
  .portrait { grid-row: 1; }
  .facts { grid-template-columns: 1fr 1fr; }
  .post-row { grid-template-columns: 1fr auto; gap: 0.4rem 1rem; }
  .post-date { grid-column: 1; }
  .post-body { grid-column: 1 / -1; }
  .category { grid-column: 2; grid-row: 1; }
  .timeline::before { left: 0.32rem; }
  .timeline li { grid-template-columns: 1fr; gap: 0.3rem; padding-left: 2rem; }
  .timeline li::before { left: 0; }
  .footer-inner { flex-direction: column; gap: 0.5rem; }
}

@media (max-width: 460px) {
  .shell, .reading-shell { width: min(100% - 28px, 1080px); }
  .facts { grid-template-columns: 1fr; }
  .hero-grid { grid-template-columns: 76px minmax(0, 1fr); }
  h1 { font-size: 2.7rem; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }