:root {
  --background: #f7f7f5;
  --surface: #ffffff;
  --text: #161616;
  --muted: #5f6368;
  --border: #deded9;
  --accent: #1f4f7a;
  --max-width: 1040px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(222, 222, 217, 0.85);
  background: rgba(247, 247, 245, 0.92);
  backdrop-filter: blur(12px);
}

.nav {
  display: flex;
  min-height: 92px;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.brand {
  color: var(--text);
  font-size: clamp(1.9rem, 3.5vw, 2.5rem);
  font-weight: 850;
  letter-spacing: -0.04em;
  line-height: 1;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.94rem;
  text-decoration: none;
}

.hero { padding-block: 7rem 5rem; }

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.15; }

h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 5.6rem);
  letter-spacing: -0.055em;
}

h2 {
  margin: 0 0 1.4rem;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  letter-spacing: -0.035em;
}

h3 {
  margin: 0 0 0.8rem;
  font-size: 1.25rem;
}

.lead {
  max-width: 760px;
  margin: 2rem 0 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.3rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.25rem;
}

.button {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.67rem 1rem;
  background: var(--surface);
  color: var(--text);
  font-weight: 650;
  text-decoration: none;
}

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

.section {
  padding-block: 4.5rem;
  border-top: 1px solid var(--border);
}

.section > p {
  max-width: 780px;
  color: var(--muted);
  font-size: 1.05rem;
}

.journey-intro {
  max-width: 820px !important;
  font-size: clamp(1.08rem, 2vw, 1.25rem) !important;
}

.journey-body { max-width: 820px; }

.journey-chapter { margin-top: 3.25rem; }

.journey-chapter:first-child { margin-top: 2.5rem; }

.journey-chapter h3 {
  margin-bottom: 1rem;
  font-size: clamp(1.35rem, 2.5vw, 1.65rem);
  letter-spacing: -0.02em;
}

.journey-chapter p {
  color: var(--text);
  font-size: 1.04rem;
}

.journey-chapter p + p { margin-top: 1.1rem; }

.journey-highlight {
  margin-block: 1.5rem;
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: var(--surface);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.project-group:not(:last-child) { padding-bottom: 4rem; }

.project-group-title {
  margin-bottom: 1rem;
  font-size: clamp(1.3rem, 2.5vw, 1.55rem);
  letter-spacing: -0.02em;
}

.card h4 {
  margin: 0 0 0.8rem;
  font-size: 1.25rem;
  line-height: 1.15;
}

.card {
  min-height: 230px;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
}

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

.card-links {
  display: flex;
  gap: 1rem;
  margin-top: 1.2rem;
  font-weight: 650;
}

.article-list {
  max-width: 780px;
  padding-left: 1.25rem;
}

.article-list li { margin-bottom: 0.65rem; }

.writing-card {
  max-width: 780px;
  margin-top: 2rem;
  padding: 1.6rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
}

.writing-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.writing-card p:not(.article-meta) { color: var(--muted); }

.article-meta {
  margin: 0 0 0.65rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.read-more { font-weight: 700; }

.article-page {
  width: min(calc(100% - 2rem), 820px);
  padding-block: 5.5rem;
}

.article-header { margin-bottom: 3.5rem; }

.article-header h1 {
  max-width: 780px;
  font-size: clamp(2.6rem, 7vw, 4.8rem);
}

.article-subtitle {
  max-width: 720px;
  margin: 1.5rem 0 1rem;
  color: var(--muted);
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
}

.article-body { font-size: 1.08rem; }

.article-body h2 {
  margin-top: 3rem;
  margin-bottom: 1rem;
  font-size: clamp(1.55rem, 3vw, 2rem);
}

.article-body p,
.article-body ul,
.article-body ol { max-width: 760px; }

.article-body li { margin-bottom: 0.5rem; }

.article-reference {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
}

.article-origin {
  margin-top: 2rem;
  font-weight: 700;
}

.contact { padding-bottom: 5rem; }

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.contact-link:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.contact-link:focus-visible {
  outline: 3px solid rgba(31, 79, 122, 0.25);
  outline-offset: 3px;
}

.contact-icon {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  fill: var(--accent);
}

.contact-link span { min-width: 0; }
.contact-link strong,
.contact-link small { display: block; }
.contact-link strong { font-size: 0.95rem; }

.contact-link small {
  overflow-wrap: anywhere;
  color: var(--muted);
  font-size: 0.82rem;
}

.footer {
  padding-block: 1.5rem 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

pre {
  max-width: 760px;
  overflow-x: auto;
  margin: 1.5rem 0;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #efefec;
  line-height: 1.55;
}

pre code { font-size: 0.9rem; }

@media (max-width: 720px) {
  .nav {
    min-height: auto;
    align-items: flex-start;
    flex-direction: column;
    padding-block: 1rem;
  }

  .brand { font-size: 2rem; }
  .nav-links { gap: 0.85rem; }
  .hero { padding-block: 4.5rem 3.5rem; }
  .grid { grid-template-columns: 1fr; }
  .article-page { padding-block: 3.5rem; }
  .contact-links { grid-template-columns: 1fr; }
}