:root {
  --bg: #f7f7f4;
  --surface: #ffffff;
  --surface-2: #fdfdfb;
  --text: #111111;
  --muted: #5a5a54;
  --line: #dfdfd6;
  --accent: #0d57c9;
  --accent-soft: #eaf1ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Manrope", sans-serif;
  background: var(--bg);
  min-height: 100vh;
}

.bg-orb,
.bg-orb-a,
.bg-orb-b {
  display: none;
}

.site-header {
  width: min(1180px, 92vw);
  margin: 0 auto;
  padding: 1.4rem 0 0.9rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 700;
  letter-spacing: 0.01em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-chip,
.open-evo {
  text-decoration: none;
  font-weight: 700;
  padding: 0.55rem 0.92rem;
  border-radius: 0.45rem;
  font-size: 0.92rem;
}

.nav-chip {
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid #cddcff;
}

.nav-chip-active {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
}

.open-evo {
  color: #ffffff;
  background: var(--accent);
}

.page-shell {
  width: min(1180px, 92vw);
  margin: 0 auto;
  padding: 1.2rem 0 2.4rem;
  display: grid;
  gap: 1rem;
}

.content-single {
  display: grid;
}

.hero-card,
.paper-card,
.article-nav-card {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: none;
}

.hero-card {
  padding: 1.2rem 1.25rem;
}

.eyebrow,
.article-kicker,
.article-nav-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0.35rem 0 0;
  font-weight: 800;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.2;
}

.section-title {
  margin: 0.35rem 0 0;
  font-weight: 800;
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.2;
}

.sub {
  margin: 0.48rem 0 0;
  color: var(--muted);
  max-width: 56rem;
}

.sub code {
  font-family: inherit;
}

.content-grid {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}

.article-nav-card {
  padding: 1rem;
  position: sticky;
  top: 1rem;
}

.article-nav-head {
  margin-bottom: 0.85rem;
}

.article-nav-copy {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.article-nav {
  display: grid;
  gap: 0.7rem;
}

.article-link {
  display: grid;
  gap: 0.28rem;
  padding: 0.8rem 0.85rem;
  border: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
  background: var(--surface-2);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.article-link:hover,
.article-link:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}

.article-link-title {
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.4;
}

.article-link-copy {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

.paper-stack {
  display: grid;
  gap: 1rem;
}

.paper-card {
  padding: clamp(1rem, 1.8vw, 1.5rem);
  background: var(--surface-2);
}

.article-title {
  margin: 0.35rem 0 1rem;
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.2;
}

.loading {
  margin: 0;
  color: var(--muted);
}

.paper-card h1,
.paper-card h2,
.paper-card h3,
.paper-card h4 {
  font-family: "Manrope", sans-serif;
  margin: 1.2rem 0 0.55rem;
  line-height: 1.25;
  color: #0f1728;
}

.paper-card h1 {
  font-size: 1.75rem;
}

.paper-card h2 {
  font-size: 1.35rem;
}

.paper-card h3 {
  font-size: 1.12rem;
}

.paper-card h4 {
  font-size: 1rem;
}

.paper-card p {
  margin: 0 0 0.92rem;
  color: #111111;
  line-height: 1.8;
  font-size: 1.03rem;
}

.paper-card strong,
.paper-card em,
.paper-card blockquote,
.paper-card table,
.paper-card th,
.paper-card td {
  font-family: inherit;
}

.paper-card ul,
.paper-card ol {
  margin: 0.2rem 0 1rem 1.45rem;
  padding: 0;
  color: #111111;
}

.paper-card li {
  margin: 0 0 0.45rem;
  line-height: 1.7;
}

.paper-card pre {
  margin: 0.9rem 0 1rem;
  border: 1px solid #e4e4e4;
  background: #f8f8f8;
  padding: 0.8rem 0.9rem;
  overflow-x: auto;
}

.paper-card code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.paper-card p code,
.paper-card li code {
  background: #f5f5f5;
  border: 1px solid #e3e3e3;
  border-radius: 4px;
  padding: 0.1rem 0.3rem;
}

.paper-card table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.5rem 0 1rem;
}

.paper-card th,
.paper-card td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

.paper-card blockquote {
  margin: 0.8rem 0 1rem;
  padding: 0.1rem 0 0.1rem 1rem;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

@media (max-width: 900px) {
  .site-header,
  .page-shell {
    width: 95vw;
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .content-grid {
    grid-template-columns: 1fr;
  }

  .article-nav-card {
    position: static;
  }

  .header-actions {
    justify-content: flex-start;
  }
}