@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=IBM+Plex+Serif:wght@400;500;600;700&display=swap");

:root {
  --bg: #f7f4ee;
  --panel: #ffffff;
  --panel-soft: #fbfaf7;
  --line: rgba(16, 24, 32, 0.12);
  --line-strong: rgba(16, 24, 32, 0.18);
  --text: #111418;
  --muted: #5b6570;
  --accent: #1f4e79;
  --accent-2: #7b5a32;
  --shadow: 0 12px 32px rgba(17, 22, 28, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Inter", system-ui, sans-serif;
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(16, 24, 32, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 24, 32, 0.015) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.4;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

a:hover {
  color: #163b5d;
}

img {
  display: block;
  max-width: 100%;
}

p, ul, ol {
  margin-top: 0;
}

.page {
  position: relative;
  z-index: 1;
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1.4rem 0 1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 1.15rem;
  font-weight: 600;
}

.brand-mark {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 999px;
  background: var(--accent);
}

.nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.nav a:hover,
.nav li.is-current a {
  color: var(--text);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: inset 0 0 0 1px var(--line);
}

.hero {
  padding: 2.2rem 0 1.25rem;
}

.hero-card {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-soft) 100%);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow);
}

.hero-inner {
  padding: clamp(1.6rem, 4vw, 3.2rem);
}

.about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(240px, 320px);
  gap: 1.5rem;
  align-items: center;
}

.about-hero-copy {
  display: grid;
  gap: 0.25rem;
}

.about-portrait {
  display: grid;
  gap: 0.85rem;
  justify-self: end;
  width: min(100%, 320px);
  padding: 0.85rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
}

.about-portrait img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: center top;
  border: 1px solid var(--line);
  background: #fff;
}

.about-portrait-caption {
  display: grid;
  gap: 0.2rem;
}

.about-portrait-caption strong {
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 1rem;
}

.about-portrait-caption span {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.kicker {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--accent-2);
  font-size: 0.83rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.hero h1 {
  margin: 0 0 0.9rem;
  max-width: 13ch;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: clamp(2.6rem, 6vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.hero p {
  max-width: 56rem;
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 1.04rem;
  line-height: 1.7;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.86rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 700;
}

.button:hover {
  transform: translateY(-1px);
  border-color: rgba(31, 78, 121, 0.26);
  background: #fff;
}

.button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.button.primary:hover {
  color: #fff;
  background: #173d5d;
  border-color: #173d5d;
}

.section {
  padding: 1.1rem 0 0;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 1.6rem 0 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.section-head h2 {
  margin: 0;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 1.18rem;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.card-inner {
  padding: 1.2rem 1.2rem 1.15rem;
}

.card h3 {
  margin: 0 0 0.45rem;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 1.02rem;
}

.card p,
.card li {
  color: var(--muted);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.95rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.32rem 0.55rem;
  border: 1px solid var(--line);
  color: var(--accent);
  background: #fff;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

.plain-list,
.link-list {
  margin: 0;
  padding-left: 1rem;
}

.plain-list li + li,
.link-list li + li {
  margin-top: 0.6rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
  margin-bottom: 1.1rem;
}

.meta a {
  font-weight: 600;
  border-bottom: 1px solid rgba(31, 78, 121, 0.24);
}

.meta a:hover {
  border-bottom-color: var(--accent);
}

.profile {
  display: grid;
  gap: 0.2rem;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.stat {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: #fff;
}

.stat strong {
  display: block;
  font-family: "IBM Plex Serif", Georgia, serif;
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.stat span {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

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

.article-lede {
  font-size: 1.01rem;
}

.contact-block,
.footer-space {
  min-height: 0;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.contact-links a {
  font-weight: 700;
}

.muted {
  color: var(--muted);
}

.article-page .hero h1 {
  max-width: 18ch;
}

.article-page .hero p {
  max-width: 60rem;
}

.article-page .article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.article-page .article-meta a {
  font-weight: 700;
  border-bottom: 1px solid rgba(31, 78, 121, 0.24);
}

.article-page .article-meta a:hover {
  border-bottom-color: var(--accent);
}

.article-page .prose {
  display: grid;
  gap: 0.9rem;
}

.article-page .prose p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.article-page .prose h2,
.article-page .prose h3 {
  margin: 0 0 0.15rem;
  font-family: "IBM Plex Serif", Georgia, serif;
}

.article-page .prose h2 {
  font-size: 1.15rem;
}

.article-page .callout {
  border-left: 3px solid var(--accent);
  background: rgba(255, 255, 255, 0.72);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}

.article-page .equation {
  overflow-x: auto;
  padding: 0.95rem 1rem;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 1.02rem;
}

.article-page .table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
}

.article-page table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.article-page th,
.article-page td {
  padding: 0.85rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-page th {
  background: #faf8f4;
  font-weight: 700;
}

.article-page .code-block {
  margin: 0;
  padding: 1rem 1.05rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #0f1720;
  color: #e8edf2;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.92rem;
  line-height: 1.65;
  border-radius: 0;
}

.article-page .code-note a {
  font-weight: 700;
}

.article-page .article-grid {
  display: grid;
  gap: 1rem;
}

.article-page .article-grid.two {
  grid-template-columns: 1fr 1fr;
}

.article-page .small-list {
  margin: 0;
  padding-left: 1rem;
  color: var(--muted);
}

.article-page .small-list li + li {
  margin-top: 0.55rem;
}

@media (max-width: 900px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid-2,
  .grid-3,
  .stat-row {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    max-width: none;
  }

  .article-page .article-grid.two {
    grid-template-columns: 1fr;
  }

  .about-hero {
    grid-template-columns: 1fr;
  }

  .about-portrait {
    justify-self: stretch;
    width: 100%;
  }
}

@media (max-width: 640px) {
  .page {
    width: min(1100px, calc(100% - 1rem));
  }

  .hero-inner,
  .card-inner {
    padding: 1rem;
  }

  .topbar {
    padding-top: 1rem;
  }
}