:root {
  --paper: #EEF3F1;
  --ink: #18393B;
  --slate: #4F6567;
  --rule: #CBD8D5;
  --tint: #E2EBE8;
  --vial: #DDE58C;
  --action: #0F5A57;
  --action-hover: #0A4442;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}
.wrap { max-width: 46rem; margin: 0 auto; padding: 0 1.25rem; }
a { color: var(--action); text-underline-offset: 0.2em; }
a:hover { color: var(--action-hover); }
:focus-visible { outline: 3px solid var(--action); outline-offset: 3px; border-radius: 3px; }

/* Header */
header { padding: 1.25rem 0; }
header .wrap { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
.mark { font-family: var(--serif); font-size: 1.25rem; font-weight: 700; letter-spacing: 0.01em; color: var(--ink); text-decoration: none; }
.site-nav { display: flex; gap: 1.25rem; align-items: baseline; }
.nav-link { font-size: 0.95rem; }

/* Home: hero */
.hero { padding: 3rem 0 3.5rem; }
h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.4rem, 8vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 1.25rem;
  max-width: 14ch;
}
.lede { font-size: 1.2rem; max-width: 34rem; margin: 0 0 1.75rem; }
.actions { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; align-items: center; }
.btn {
  display: inline-block;
  background: var(--action);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.85rem 1.4rem;
  min-height: 48px;
  border-radius: 6px;
}
.btn:hover { background: var(--action-hover); color: #fff; }

.vial { margin-top: 3rem; width: 100%; max-width: 32rem; display: block; }
.bubble { transform-box: fill-box; transform-origin: center; animation: settle 2.2s cubic-bezier(.2,.7,.25,1) 0.3s both; }
@keyframes settle {
  0% { transform: translateX(140px); }
  55% { transform: translateX(-22px); }
  78% { transform: translateX(8px); }
  100% { transform: translateX(0); }
}

/* Home: sections */
section { padding: 2.75rem 0; border-top: 1px solid var(--rule); }
h2 { font-family: var(--serif); font-size: 1.65rem; line-height: 1.2; margin: 0 0 1rem; }
p { margin: 0 0 1rem; max-width: 36rem; }

.services, .posts { margin: 1.5rem 0 0; padding: 0; list-style: none; }
.services li { padding: 1.25rem 0; border-top: 1px solid var(--rule); }
.services li:first-child { border-top: 0; padding-top: 0; }
.services h3 { font-family: var(--serif); font-size: 1.2rem; margin: 0 0 0.35rem; }
.services p { margin: 0; color: var(--slate); }

.posts li { padding: 1.25rem 0; border-top: 1px solid var(--rule); }
.posts li:first-child { border-top: 0; padding-top: 0; }
.posts h3 { font-family: var(--serif); font-size: 1.25rem; line-height: 1.3; margin: 0 0 0.4rem; }
.posts h3 a { color: var(--ink); text-decoration: none; }
.posts h3 a:hover { text-decoration: underline; text-underline-offset: 0.2em; }
.posts p { margin: 0; color: var(--slate); }

.steps { margin: 1.25rem 0 0; padding-left: 1.4rem; max-width: 36rem; }
.steps li { margin-bottom: 1rem; padding-left: 0.3rem; }
.steps strong { display: block; }

.contact { padding-bottom: 3.5rem; }
.email-line { margin-top: 1.25rem; color: var(--slate); font-size: 0.95rem; }

footer { border-top: 1px solid var(--rule); padding: 1.5rem 0 2.5rem; color: var(--slate); font-size: 0.9rem; }

/* Blog posts */
.post { padding: 1.5rem 0 3rem; }
.back { display: inline-block; margin-bottom: 1.5rem; font-size: 0.95rem; }
.post .series { color: var(--slate); font-size: 0.95rem; margin: 0 0 0.5rem; }
.post h1 { font-size: clamp(2rem, 6.5vw, 3rem); max-width: 24ch; margin-bottom: 1rem; }
.post .dek { font-size: 1.2rem; color: var(--slate); max-width: 36rem; margin-bottom: 2rem; }
.post h2 { font-size: 1.5rem; margin: 2.75rem 0 0.75rem; }
.post h3 { font-family: var(--serif); font-size: 1.25rem; margin: 2.25rem 0 0.5rem; }
.post h4 { font-size: 1.05rem; margin: 1.75rem 0 0.4rem; }
.post p, .post li { max-width: 38rem; font-size: 1.125rem; line-height: 1.7; }
.post ol, .post ul { padding-left: 1.4rem; max-width: 38rem; }
.post li { margin-bottom: 0.6rem; padding-left: 0.2rem; }

.post code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--tint);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
.post pre {
  background: var(--tint);
  border-radius: 6px;
  padding: 1rem 1.1rem;
  margin: 1.25rem 0;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.55;
  max-width: 38rem;
}
.post pre code { background: none; padding: 0; font-size: inherit; }

.formula { font-family: var(--serif); font-style: italic; font-size: 1.3rem; margin: 1rem 0 1.25rem; }

.post figure { margin: 1.75rem 0; }
.post figcaption { color: var(--slate); font-size: 0.95rem; margin-top: 0.6rem; max-width: 38rem; }

.table-scroll { overflow-x: auto; margin: 1.25rem 0; }
.data-table { border-collapse: collapse; font-size: 1rem; }
.data-table th, .data-table td { border: 2px solid var(--ink); padding: 0.45rem 1rem; text-align: left; }
.data-table th { background: var(--tint); }
.data-table caption { caption-side: bottom; text-align: left; color: var(--slate); font-size: 0.95rem; padding-top: 0.6rem; }

.post .dag {
  list-style: none;
  margin: 0;
  padding: 1rem 1rem 1rem 1.25rem;
  background: var(--tint);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.1rem;
  max-width: none;
}
.post .dag li {
  position: relative;
  margin: 0;
  padding: 0.45rem 0.85rem;
  background: #fff;
  border: 2px solid var(--ink);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.3;
  max-width: none;
}
.post .dag li + li::before {
  content: "";
  position: absolute;
  left: 1.4rem;
  top: -1.1rem;
  height: 1.1rem;
  border-left: 2px solid var(--ink);
}

.timeline { display: block; width: 100%; max-width: 34rem; height: auto; }
.timeline text { font-family: var(--sans); }

@media (min-width: 40rem) {
  .services li { display: grid; grid-template-columns: 13rem 1fr; gap: 1.5rem; }
  .services h3 { margin: 0; }
  .hero { padding: 4.5rem 0 5rem; }
}
@media (min-width: 44rem) {
  .post .dag { flex-direction: row; align-items: center; gap: 1.5rem; padding: 1.25rem 1.25rem; }
  .post .dag li + li::before {
    left: -1.5rem;
    top: 50%;
    width: 1.5rem;
    height: 0;
    border-left: 0;
    border-top: 2px solid var(--ink);
  }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bubble { animation: none; }
}