/* trukhin.com — v2, 2026-09-20
   Hand-written CSS. No frameworks, no external requests, no JavaScript.
   One accent color, system font stack, light/dark via prefers-color-scheme. */

:root {
  --bg: #fbfbf9;
  --surface: #f3f3ee;
  --text: #1b1c1e;
  --text-2: #54575e;
  --text-3: #8a8d94;
  --accent: #2b4fd8;
  --border: #e5e5df;
  --rule: #c9c9c0;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
  --measure: 42rem;
  --wide: 72rem;
  --pad: clamp(1.25rem, 5vw, 2.5rem);
  --radius: 0.75rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101114;
    --surface: #17181c;
    --text: #e9e9e6;
    --text-2: #a2a5ac;
    --text-3: #6d7077;
    --accent: #94a6ff;
    --border: #26272c;
    --rule: #3b3c42;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1.0625rem/1.7 var(--sans);
  font-synthesis-weight: none;
}

::selection {
  background: var(--accent);
  color: var(--bg);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

/* ---------- layout primitives ---------- */

.container {
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--text);
  color: var(--bg);
  padding: 0.6rem 1rem;
  z-index: 10;
}

.skip-link:focus {
  left: 0;
}

/* ---------- header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  padding-block: 1.05rem;
}

.wordmark {
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.wordmark span {
  color: var(--accent);
}

.wordmark:hover {
  text-decoration: none;
}

.site-nav ul {
  display: flex;
  gap: 1.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--text-2);
}

.site-nav a:hover {
  color: var(--text);
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
}

/* ---------- hero ---------- */

.hero {
  padding-block: clamp(4rem, 12vh, 7rem) clamp(2.5rem, 7vh, 4rem);
}

.eyebrow {
  font: 500 0.76rem/1.4 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-3);
  margin: 0 0 1.4rem;
}

h1 {
  font-size: clamp(2.1rem, 1.1rem + 4.5vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  margin: 0 0 1.4rem;
  max-width: 20ch;
}

.lede {
  font-size: clamp(1.15rem, 0.95rem + 1vw, 1.4rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
  color: var(--text-2);
  max-width: 40ch;
  margin: 0 0 1.75rem;
}

.hero .intro {
  max-width: 62ch;
  color: var(--text-2);
  margin: 0 0 2.25rem;
}

.action-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1.6rem;
  font-size: 0.98rem;
}

.action-row .primary {
  display: inline-block;
  border: 1px solid var(--text);
  border-radius: 0.45rem;
  padding: 0.5rem 1.1rem;
  color: var(--text);
  font-weight: 600;
}

.action-row .primary:hover {
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
}

/* ---------- sections ---------- */

.section {
  border-top: 1px solid var(--border);
  padding-block: clamp(2.75rem, 8vh, 4.75rem);
}

.section > .container > h2,
.section-h {
  font-size: clamp(1.35rem, 1.1rem + 1vw, 1.7rem);
  margin: 0 0 0.75rem;
}

.section-note {
  color: var(--text-3);
  max-width: 62ch;
  margin: 0 0 2.25rem;
}

/* ---------- case cards ---------- */

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
  gap: 1.25rem;
}

.case {
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.4rem;
}

.case .meta {
  font: 500 0.73rem/1.5 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

.case h3 {
  font-size: 1.1rem;
  line-height: 1.35;
  margin: 0;
}

.case > p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.95rem;
}

.case dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 1rem;
  font-size: 0.92rem;
}

.case dt {
  font: 500 0.7rem/1.9 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-3);
  white-space: nowrap;
}

.case dd {
  margin: 0;
  color: var(--text-2);
}

.case .boundary {
  margin-top: auto;
  border-top: 1px dashed var(--border);
  padding-top: 0.9rem;
  font-size: 0.87rem;
  color: var(--text-3);
}

.case .boundary b {
  font-weight: 600;
  color: var(--text-2);
}

.case .more {
  font-size: 0.92rem;
}

/* ---------- now feed ---------- */

.feed {
  list-style: none;
  margin: 0;
  padding: 0;
}

.feed li {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 0.35rem 1.5rem;
  padding-block: 1.1rem;
  border-top: 1px solid var(--border);
}

.feed time {
  font: 500 0.8rem/2 var(--mono);
  color: var(--text-3);
  white-space: nowrap;
}

.feed p {
  margin: 0;
  color: var(--text-2);
  max-width: 66ch;
}

/* ---------- link list ---------- */

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.link-list li {
  border-top: 1px solid var(--border);
  padding-block: 0.8rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.link-list .k {
  font: 500 0.75rem/2 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
}

.link-list .v {
  color: var(--text-2);
  font-size: 0.95rem;
  word-break: break-word;
}

/* ---------- prose (article, about) ---------- */

.page-head {
  padding-block: clamp(3.5rem, 10vh, 6rem) clamp(2rem, 6vh, 3rem);
}

.page-head h1 {
  font-size: clamp(2rem, 1.2rem + 3.5vw, 3rem);
  max-width: 26ch;
}

.page-head .lede {
  margin-bottom: 0;
}

.prose {
  max-width: var(--measure);
}

.prose p {
  margin: 0 0 1.2rem;
}

.prose h2 {
  font-size: 1.35rem;
  margin: 2.75rem 0 1rem;
}

.prose h3 {
  font-size: 1.1rem;
  margin: 2rem 0 0.75rem;
}

.prose ul,
.prose ol {
  margin: 0 0 1.2rem;
  padding-left: 1.4rem;
  color: var(--text-2);
}

.prose li {
  margin-bottom: 0.45rem;
}

.prose blockquote {
  margin: 0 0 1.2rem;
  padding: 0.35rem 0 0.35rem 1.3rem;
  border-left: 2px solid var(--accent);
  color: var(--text-2);
}

.prose code {
  font: 500 0.88em var(--mono);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  padding: 0.1em 0.35em;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  font: 500 0.8rem/1.8 var(--mono);
  color: var(--text-3);
  margin: 0 0 2.5rem;
}

.post-meta time {
  color: var(--accent);
}

.note {
  border-left: 2px solid var(--accent);
  background: var(--surface);
  padding: 1rem 1.25rem;
  border-radius: 0 0.4rem 0.4rem 0;
  color: var(--text-2);
  font-size: 0.95rem;
  max-width: var(--measure);
  margin: 0 0 1.5rem;
}

.note b {
  color: var(--text);
}

/* ---------- tables ---------- */

.table-wrap {
  overflow-x: auto;
  max-width: var(--wide);
}

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

th {
  text-align: left;
  font: 600 0.7rem/1.6 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-3);
  border-bottom: 1px solid var(--rule);
  padding: 0.55rem 1rem 0.55rem 0;
}

td {
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 1rem 0.85rem 0;
  vertical-align: top;
  color: var(--text-2);
}

td:first-child {
  font: 500 0.82rem/1.9 var(--mono);
  color: var(--text-3);
  white-space: nowrap;
}

td strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- talks / post lists ---------- */

.item-list {
  border-top: 1px solid var(--border);
  max-width: var(--wide);
}

.item {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0.3rem 1.5rem;
  padding-block: 1.4rem;
  border-bottom: 1px solid var(--border);
}

.item time,
.item .when {
  font: 500 0.8rem/2 var(--mono);
  color: var(--text-3);
  white-space: nowrap;
}

.item h2 {
  font-size: 1.08rem;
  margin: 0 0 0.35rem;
  letter-spacing: -0.015em;
}

.item h2 a {
  color: var(--text);
}

.item h2 a:hover {
  color: var(--accent);
  text-decoration: none;
}

.item p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.95rem;
  max-width: 66ch;
}

.item .role {
  display: inline-block;
  margin-top: 0.5rem;
  font: 500 0.72rem/1.6 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
}

/* ---------- principles ---------- */

.principle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.5rem 2.5rem;
  max-width: var(--wide);
}

.principle h3 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.principle h3::before {
  content: "0" counter(principle);
  counter-increment: principle;
  display: block;
  font: 500 0.75rem/2 var(--mono);
  color: var(--accent);
  letter-spacing: 0.1em;
}

.principles {
  counter-reset: principle;
}

.principle p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.95rem;
}

/* ---------- projects ---------- */

.project {
  border-top: 1px solid var(--border);
  padding-block: clamp(2rem, 5vh, 3rem);
  max-width: var(--wide);
}

.project .meta {
  font: 500 0.73rem/1.6 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin: 0 0 0.8rem;
}

.project h2 {
  font-size: clamp(1.3rem, 1.1rem + 1vw, 1.65rem);
  margin: 0 0 1rem;
}

.project h3 {
  font-size: 1rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--text);
}

.project p {
  margin: 0 0 1rem;
  color: var(--text-2);
  max-width: 68ch;
}

.project ul {
  margin: 0 0 1rem;
  padding-left: 1.3rem;
  color: var(--text-2);
  max-width: 66ch;
}

.project li {
  margin-bottom: 0.4rem;
}

.project .boundary {
  border-top: 1px dashed var(--border);
  padding-top: 0.9rem;
  font-size: 0.9rem;
  color: var(--text-3);
  max-width: 66ch;
}

.project .boundary b {
  font-weight: 600;
  color: var(--text-2);
}

.repo-link {
  font: 500 0.85rem/1.8 var(--mono);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: clamp(3rem, 10vh, 6rem);
  padding-block: 1.8rem;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  font: 400 0.82rem/1.7 var(--mono);
  color: var(--text-3);
}

.footer-row a {
  color: var(--text-2);
}

.footer-row ul {
  display: flex;
  gap: 1.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

/* ---------- misc ---------- */

.backlink {
  font: 500 0.85rem/1.8 var(--mono);
  color: var(--text-3);
  display: inline-block;
  margin-bottom: 1.5rem;
}

.backlink::before {
  content: "\2190\00a0";
}

code.block,
pre {
  font: 500 0.85rem/1.7 var(--mono);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  max-width: 100%;
}

@media (max-width: 40rem) {
  .feed li,
  .item {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .case dl {
    grid-template-columns: 1fr;
    gap: 0.1rem;
  }

  .case dd {
    margin-bottom: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .skip-link {
    display: none;
  }

  body {
    font-size: 11pt;
  }
}