/* Throughput design system */
:root {
  color-scheme: light;
  --canvas: #f5f7fb;
  --surface: #ffffff;
  --surface-muted: #e9eef7;
  --ink: #172033;
  --ink-soft: #4f5c73;
  --ink-faint: #778197;
  --line: #d8dfeb;
  --line-strong: #b8c3d5;
  --blue: #3157d5;
  --blue-soft: #dce5ff;
  --orange: #e85d3f;
  --orange-soft: #ffe2da;
  --code-bg: #111827;
  --code-ink: #e7edf9;
  --header-bg: rgba(245, 247, 251, 0.9);
  --shadow: 0 22px 70px rgba(44, 58, 91, 0.12);
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Arial Narrow", "Aptos Display", "Helvetica Neue", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --shell: 1180px;
  --shell-narrow: 760px;
  --radius: 6px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #101521;
  --surface: #171e2d;
  --surface-muted: #202a3c;
  --ink: #eef3fc;
  --ink-soft: #b4bfd2;
  --ink-faint: #8793a8;
  --line: #2b374c;
  --line-strong: #43516a;
  --blue: #7897ff;
  --blue-soft: #26365f;
  --orange: #ff896e;
  --orange-soft: #4d2c2a;
  --code-bg: #090d16;
  --code-ink: #eef3fc;
  --header-bg: rgba(16, 21, 33, 0.9);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

button,
input,
textarea,
select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

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

::selection {
  background: var(--blue);
  color: #fff;
}

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 4px;
}

.shell {
  width: min(calc(100% - 48px), var(--shell));
  margin-inline: auto;
}

.shell-narrow {
  width: min(calc(100% - 48px), var(--shell-narrow));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--canvas);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.section-label,
.eyebrow,
.post-card-meta,
.post-meta,
.post-kicker,
.trace-toolbar,
.archive-summary {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-label {
  margin: 0 0 14px;
  color: var(--blue);
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: 0.92rem;
  font-weight: 750;
  transition: transform 180ms ease, background-color 180ms ease, color 180ms ease;
}

.button-primary {
  background: var(--ink);
  color: var(--canvas);
}

.button-primary:hover {
  transform: translateY(-2px);
  background: var(--blue);
  color: #fff;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--line-strong);
  font-size: 0.9rem;
  font-weight: 700;
  transition: border-color 180ms ease, color 180ms ease;
}

.text-link:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.text-link span,
.button span {
  transition: transform 180ms ease;
}

.text-link:hover span,
.button:hover span {
  transform: translate(2px, -2px);
}

/* Header */
.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: var(--header-bg);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: grid;
  min-height: 72px;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 34px;
}

.site-brand {
  display: inline-flex;
  width: max-content;
  align-items: center;
  gap: 11px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 850;
  letter-spacing: -0.035em;
}

.brand-mark {
  position: relative;
  display: inline-flex;
  width: 29px;
  height: 20px;
  align-items: center;
  justify-content: space-between;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  z-index: -1;
  width: 12px;
  border-top: 1px solid var(--ink-faint);
  content: "";
}

.brand-mark::before { left: 4px; transform: rotate(-27deg); }
.brand-mark::after { right: 4px; transform: rotate(27deg); }

.brand-mark i {
  width: 7px;
  height: 7px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--canvas);
}

.brand-mark i:nth-child(2) { align-self: flex-start; border-color: var(--blue); }
.brand-mark i:nth-child(3) { border-color: var(--orange); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 29px;
}

.site-nav a {
  position: relative;
  color: var(--ink-soft);
  font-size: 0.86rem;
  font-weight: 680;
}

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

.site-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 2px;
  background: var(--orange);
  content: "";
}

.icon-button {
  display: inline-grid;
  width: 38px;
  height: 38px;
  padding: 0;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.icon-button:hover { border-color: var(--line-strong); background: var(--surface); }

.theme-toggle svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.moon-icon,
[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }

.menu-toggle { display: none; }

/* Homepage hero */
.hero {
  display: grid;
  min-height: 680px;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: clamp(44px, 7vw, 92px);
  padding-block: 92px 88px;
}

.eyebrow {
  display: flex;
  margin: 0 0 29px;
  color: var(--ink-faint);
  gap: 22px;
}

.eyebrow span:first-child { color: var(--blue); }

.hero h1,
.page-hero h1,
.about-hero h1,
.not-found h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 850;
  letter-spacing: -0.07em;
  line-height: 0.98;
}

.hero h1 { font-size: clamp(3.6rem, 6.1vw, 5.6rem); }

.hero h1 em,
.about-hero h1 em {
  color: var(--blue);
  font-style: normal;
}

.hero-summary {
  max-width: 560px;
  margin: 32px 0 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
  line-height: 1.8;
  word-break: keep-all;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 40px;
}

.trace-board {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  transform: rotate(1.2deg);
}

.trace-toolbar {
  display: grid;
  min-height: 50px;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 17px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.62rem;
}

.trace-toolbar > span:first-child { display: inline-flex; align-items: center; gap: 7px; }
.trace-toolbar code { font-family: var(--font-mono); color: var(--ink-soft); }
.trace-status { justify-self: end; color: var(--blue); }

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--orange-soft);
  animation: status-pulse 2.4s ease-in-out infinite;
}

.trace-canvas {
  position: relative;
  min-height: 368px;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
}

.trace-canvas::after {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34%;
  height: 2px;
  background: var(--orange);
  content: "";
}

.trace-canvas > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.trace-line {
  fill: none;
  stroke: var(--blue);
  stroke-dasharray: 7 7;
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
  animation: data-flow 2.6s linear infinite;
}

.trace-line-two { animation-delay: -0.8s; }
.trace-line-three { stroke: var(--orange); animation-delay: -1.6s; }

.trace-nodes {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.trace-node {
  position: absolute;
  display: grid;
  width: 112px;
  min-height: 70px;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0 10px;
  padding: 13px;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--blue);
  border-radius: 3px;
  background: var(--surface);
  box-shadow: 5px 5px 0 var(--surface-muted);
  font-family: var(--font-mono);
}

.trace-node b { color: var(--ink-faint); font-size: 0.58rem; }
.trace-node span { font-size: 0.68rem; font-weight: 800; }
.trace-node small { grid-column: 2; color: var(--blue); font-size: 0.6rem; }
.node-client { top: 44px; left: 5%; }
.node-api { top: 124px; left: 35%; }
.node-kafka { top: 43px; right: 5%; border-left-color: var(--orange); }
.node-kafka small { color: var(--orange); }
.node-ledger { right: 13%; bottom: 44px; }

.trace-note {
  position: absolute;
  bottom: 35px;
  left: 6%;
  display: flex;
  flex-direction: column;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-family: var(--font-mono);
}

.trace-note span,
.trace-note small { color: var(--ink-faint); font-size: 0.58rem; }
.trace-note strong { font-size: 1.18rem; line-height: 1.45; }

@keyframes data-flow { to { stroke-dashoffset: -28; } }
@keyframes status-pulse { 50% { box-shadow: 0 0 0 7px transparent; } }

.expertise-strip {
  overflow: hidden;
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.expertise-list {
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.expertise-list i { width: 4px; height: 4px; border-radius: 50%; background: var(--orange); }

/* Homepage content */
.home-section { padding-block: 116px 130px; }

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line-strong);
}

.section-heading h2,
.topic-index h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 3.4vw, 3.1rem);
  letter-spacing: -0.055em;
  line-height: 1;
}

.home-content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 310px;
  gap: 74px;
  padding-top: 14px;
}

.post-card {
  position: relative;
  padding: 36px 34px 38px 0;
  border-bottom: 1px solid var(--line);
}

.post-card::after {
  position: absolute;
  right: 6px;
  bottom: 43px;
  color: var(--ink-faint);
  content: "↗";
  font-family: var(--font-mono);
  transition: color 180ms ease, transform 180ms ease;
}

.post-card:hover::after { color: var(--blue); transform: translate(3px, -3px); }

.post-card-meta { display: flex; margin-bottom: 13px; color: var(--ink-faint); gap: 14px; }
.post-card-meta span { color: var(--orange); }

.post-card h3 {
  max-width: 680px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.42rem, 2.1vw, 1.85rem);
  letter-spacing: -0.045em;
  line-height: 1.28;
}

.post-card h3 a::after { position: absolute; inset: 0; content: ""; }

.post-card h3 a:hover { color: var(--blue); }

.post-card > p {
  max-width: 680px;
  margin: 13px 0 17px;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.75;
  word-break: keep-all;
}

.card-tags { display: flex; flex-wrap: wrap; color: var(--ink-faint); gap: 12px; font-family: var(--font-mono); font-size: 0.68rem; }

.topic-index {
  align-self: start;
  margin-top: 34px;
  padding: 30px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.topic-index h2 { font-size: 1.85rem; }
.topic-index ul { margin: 28px 0 0; padding: 0; list-style: none; }
.topic-index li { border-top: 1px solid var(--line); }
.topic-index a { display: flex; align-items: center; justify-content: space-between; padding: 15px 0; font-size: 0.88rem; font-weight: 680; }
.topic-index a:hover { color: var(--blue); }
.topic-index b { color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.67rem; }
.topic-note { margin: 23px 0 0; padding-top: 19px; border-top: 1px solid var(--line); color: var(--ink-faint); font-size: 0.77rem; line-height: 1.65; }

.home-note { border-block: 1px solid var(--line); background: var(--ink); color: var(--canvas); }
.note-inner { display: grid; min-height: 300px; grid-template-columns: 180px 1fr auto; align-items: center; gap: 38px; }
.note-inner .section-label { color: var(--orange); }
.note-inner blockquote { max-width: 720px; margin: 0; font-family: var(--font-display); font-size: clamp(1.7rem, 3vw, 2.8rem); font-weight: 720; letter-spacing: -0.045em; line-height: 1.35; word-break: keep-all; }
.note-inner > a { align-self: end; margin-bottom: 51px; color: inherit; font-size: 0.76rem; font-weight: 700; }

/* Archive and taxonomy pages */
.page-hero {
  padding-block: 104px 82px;
  border-bottom: 1px solid var(--line-strong);
}

.page-hero.compact { padding-bottom: 65px; }
.page-hero h1 { max-width: 780px; font-size: clamp(3.4rem, 7vw, 6.2rem); }
.page-hero > p:last-child { max-width: 620px; margin: 28px 0 0; color: var(--ink-soft); font-size: 1rem; }

.archive { padding-block: 22px 130px; }
.archive-summary { display: flex; justify-content: space-between; padding: 16px 0; border-bottom: 1px solid var(--line); color: var(--ink-faint); }
.archive-list .post-card { display: grid; grid-template-columns: 155px minmax(0, 1fr); padding: 38px 45px 40px 0; }
.archive-list .post-card-meta { grid-column: 1; grid-row: 1 / span 3; flex-direction: column; }
.archive-list .post-card h3,
.archive-list .post-card > p,
.archive-list .card-tags { grid-column: 2; }
.archive-list .post-card > p { margin-bottom: 15px; }

.taxonomy { padding-block: 50px 130px; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; padding-bottom: 48px; border-bottom: 1px solid var(--line); }
.tag-cloud a { padding: 9px 13px; border: 1px solid var(--line); border-radius: 2px; background: var(--surface); font-family: var(--font-mono); font-size: 0.75rem; }
.tag-cloud a:hover { border-color: var(--blue); color: var(--blue); }
.tag-cloud sup { color: var(--orange); }
.taxonomy-group { display: grid; grid-template-columns: 260px 1fr; gap: 70px; padding: 50px 0; border-bottom: 1px solid var(--line); }
.taxonomy-title h2 { margin: 0; font-family: var(--font-display); font-size: 1.8rem; letter-spacing: -0.04em; }
.taxonomy-title span { color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.66rem; }
.taxonomy-group ul { margin: 0; padding: 0; list-style: none; }
.taxonomy-group li { display: grid; grid-template-columns: 105px 1fr; gap: 20px; padding: 11px 0; }
.taxonomy-group time { color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.7rem; }
.taxonomy-group a { font-size: 0.92rem; font-weight: 650; }
.taxonomy-group a:hover { color: var(--blue); }

.category-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; padding-block: 52px 130px; }
.category-card { scroll-margin-top: 100px; padding: 30px; border: 1px solid var(--line); background: var(--surface); }
.category-card header { display: flex; align-items: baseline; gap: 15px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.category-card header span { color: var(--orange); font-family: var(--font-mono); font-size: 0.72rem; }
.category-card h2 { margin: 0; font-family: var(--font-display); font-size: 1.8rem; letter-spacing: -0.04em; }
.category-card ul { margin: 18px 0 0; padding: 0; list-style: none; }
.category-card li { display: grid; grid-template-columns: 1fr auto; gap: 20px; padding: 11px 0; }
.category-card a { font-size: 0.9rem; font-weight: 650; }
.category-card a:hover { color: var(--blue); }
.category-card time { color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.68rem; }

/* About */
.about-hero { display: grid; grid-template-columns: 1.2fr 0.8fr; align-items: end; gap: 90px; padding-block: 112px 94px; border-bottom: 1px solid var(--line-strong); }
.about-hero h1 { font-size: clamp(3.4rem, 6.3vw, 5.9rem); }
.about-lead { margin: 0 0 7px; color: var(--ink-soft); font-size: 1.05rem; line-height: 1.9; word-break: keep-all; }
.about-grid { display: grid; grid-template-columns: 1fr 350px; gap: 105px; padding-block: 100px 130px; }
.about-section h2 { margin: 0; font-family: var(--font-display); font-size: clamp(2rem, 4vw, 3.2rem); letter-spacing: -0.055em; line-height: 1.15; }
.about-section > p:last-child { max-width: 650px; margin: 27px 0 0; color: var(--ink-soft); line-height: 1.9; }
.principle-list { margin-top: 70px; }
.principle-list article { display: grid; grid-template-columns: 60px 1fr; gap: 16px; padding: 28px 0; border-top: 1px solid var(--line); }
.principle-list article > span { color: var(--orange); font-family: var(--font-mono); font-size: 0.72rem; }
.principle-list h3 { margin: 0 0 8px; font-family: var(--font-display); font-size: 1.3rem; letter-spacing: -0.025em; }
.principle-list p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }
.stack-panel { align-self: start; padding: 31px; border-top: 3px solid var(--blue); background: var(--surface); box-shadow: var(--shadow); }
.stack-panel dl { margin: 26px 0 32px; }
.stack-panel dl > div { padding: 17px 0; border-top: 1px solid var(--line); }
.stack-panel dt { margin-bottom: 5px; color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.67rem; text-transform: uppercase; }
.stack-panel dd { margin: 0; font-size: 0.88rem; font-weight: 650; }
.stack-panel .button { width: 100%; }

/* Post detail */
.reading-progress { position: fixed; z-index: 80; top: 71px; left: 0; width: 100%; height: 2px; background: transparent; }
.reading-progress span { display: block; width: 0; height: 100%; background: var(--orange); }
.post-hero { padding-block: 82px 56px; }
.back-link { display: inline-block; margin-bottom: 54px; color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.72rem; }
.back-link:hover { color: var(--blue); }
.post-kicker { display: flex; color: var(--blue); gap: 12px; }
.post-hero h1 { margin: 19px 0 0; font-family: var(--font-display); font-size: clamp(2.6rem, 6vw, 4.9rem); font-weight: 850; letter-spacing: -0.065em; line-height: 1.08; word-break: keep-all; }
.post-description { margin: 25px 0 0; color: var(--ink-soft); font-size: 1.12rem; line-height: 1.75; word-break: keep-all; }
.post-meta { display: flex; flex-wrap: wrap; margin-top: 30px; color: var(--ink-faint); gap: 10px; }
.post-body { padding-block: 26px 80px; border-top: 1px solid var(--line-strong); font-size: 1.03rem; line-height: 1.9; word-break: keep-all; }
.post-body > *:first-child { margin-top: 0; }
.post-body h2,
.post-body h3,
.post-body h4 { position: relative; color: var(--ink); font-family: var(--font-display); letter-spacing: -0.04em; line-height: 1.35; scroll-margin-top: 110px; }
.post-body h2 { margin: 3.5em 0 0.85em; padding-top: 0.72em; border-top: 1px solid var(--line); font-size: 2rem; }
.post-body h3 { margin: 2.4em 0 0.7em; font-size: 1.45rem; }
.post-body p { margin: 1.35em 0; }
.post-body a { color: var(--blue); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.post-body strong { color: var(--ink); font-weight: 760; }
.post-body ul,
.post-body ol { margin: 1.35em 0; padding-left: 1.4em; }
.post-body li { margin: 0.45em 0; padding-left: 0.3em; }
.post-body li::marker { color: var(--orange); }
.post-body blockquote { margin: 2em 0; padding: 19px 24px; border-left: 3px solid var(--blue); background: var(--surface-muted); color: var(--ink-soft); }
.post-body blockquote p { margin: 0; }
.post-body code { padding: 0.16em 0.38em; border: 1px solid var(--line); border-radius: 3px; background: var(--surface-muted); color: var(--orange); font-family: var(--font-mono); font-size: 0.84em; }
.post-body pre { overflow-x: auto; margin: 2em 0; padding: 23px 25px; border: 1px solid #27344b; border-radius: 4px; background: var(--code-bg); color: var(--code-ink); font-size: 0.84rem; line-height: 1.7; tab-size: 2; }
.post-body pre code { padding: 0; border: 0; background: transparent; color: inherit; }
.post-body table { width: 100%; margin: 2em 0; border-collapse: collapse; font-size: 0.9rem; }
.post-body th,
.post-body td { padding: 12px 14px; border: 1px solid var(--line); text-align: left; }
.post-body th { background: var(--surface-muted); font-family: var(--font-mono); font-size: 0.74rem; }
.post-body hr { margin: 3em 0; border: 0; border-top: 1px solid var(--line); }
.highlight .c,
.highlight .cm,
.highlight .c1 { color: #8190aa; }
.highlight .k,
.highlight .kd,
.highlight .kt { color: #8aa7ff; }
.highlight .s,
.highlight .s1,
.highlight .s2 { color: #ff9c85; }
.highlight .nf,
.highlight .na { color: #d9e2ff; }
.post-footer { padding-bottom: 120px; }
.post-tags { display: flex; flex-wrap: wrap; gap: 9px; padding: 29px 0; border-block: 1px solid var(--line); }
.post-tags a { padding: 7px 11px; background: var(--surface-muted); color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.7rem; }
.post-tags a:hover { color: var(--blue); }
.author-card { display: grid; grid-template-columns: 54px 1fr; gap: 18px; margin: 46px 0; padding: 26px; border: 1px solid var(--line); background: var(--surface); }
.author-monogram { display: grid; width: 54px; height: 54px; place-items: center; border-radius: 50%; background: var(--ink); color: var(--canvas); font-family: var(--font-mono); font-size: 0.75rem; }
.author-card strong { font-family: var(--font-display); font-size: 1.05rem; }
.author-card p { margin: 3px 0 0; color: var(--ink-soft); font-size: 0.83rem; }
.post-pagination { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.post-pagination a { display: flex; min-height: 120px; flex-direction: column; padding: 21px; border: 1px solid var(--line); background: var(--surface); }
.post-pagination a:hover { border-color: var(--blue); }
.post-pagination span { margin-bottom: 9px; color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.66rem; }
.post-pagination strong { font-family: var(--font-display); font-size: 1rem; line-height: 1.45; }
.post-pagination .next { grid-column: 2; text-align: right; }

/* Error page and footer */
.not-found { min-height: 680px; padding-block: 125px; }
.not-found > span { color: var(--orange); font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; }
.not-found h1 { max-width: 800px; margin-top: 24px; font-size: clamp(4rem, 8vw, 7rem); }
.not-found p { max-width: 560px; margin: 30px 0; color: var(--ink-soft); }
.not-found > div { display: flex; align-items: center; gap: 28px; }
.site-footer { padding-block: 54px 28px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 30px; }
.footer-brand { font-family: var(--font-display); font-size: 1.25rem; font-weight: 850; letter-spacing: -0.04em; }
.footer-grid > div:first-child p { max-width: 480px; margin: 8px 0 0; color: var(--ink-faint); font-size: 0.78rem; }
.footer-links { display: flex; align-items: start; gap: 22px; font-family: var(--font-mono); font-size: 0.69rem; }
.footer-links a:hover { color: var(--blue); }
.copyright { grid-column: 1 / -1; margin: 24px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.63rem; }

@media (max-width: 960px) {
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 66px; padding-block: 78px; }
  .hero-copy { max-width: 760px; }
  .trace-board { width: min(100%, 660px); justify-self: end; transform: none; }
  .home-content-grid { grid-template-columns: 1fr 270px; gap: 42px; }
  .note-inner { grid-template-columns: 130px 1fr; }
  .note-inner > a { grid-column: 2; align-self: start; margin: -38px 0 42px; }
  .about-hero { grid-template-columns: 1fr; gap: 42px; }
  .about-lead { max-width: 680px; }
  .about-grid { grid-template-columns: 1fr 310px; gap: 50px; }
}

@media (max-width: 760px) {
  .shell,
  .shell-narrow { width: min(calc(100% - 36px), var(--shell)); }
  .header-inner { min-height: 64px; grid-template-columns: 1fr auto auto; gap: 10px; }
  .menu-toggle { display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; }
  .menu-toggle span { display: block; width: 15px; border-top: 1.5px solid currentColor; transition: transform 180ms ease; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.75px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.75px) rotate(-45deg); }
  .site-nav { position: absolute; top: 64px; right: 0; left: 0; display: none; padding: 18px; border-bottom: 1px solid var(--line); background: var(--canvas); box-shadow: 0 15px 30px rgba(23, 32, 51, 0.08); }
  .site-nav.is-open { display: grid; }
  .site-nav a { padding: 10px 0; }
  .site-nav a[aria-current="page"]::after { display: none; }
  .hero { gap: 48px; padding-block: 61px 65px; }
  .hero h1 { font-size: clamp(3.25rem, 15vw, 5rem); }
  .hero-summary { margin-top: 25px; font-size: 0.98rem; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 20px; margin-top: 32px; }
  .trace-board { width: 100%; }
  .trace-canvas { min-height: 420px; background-size: 24px 24px; }
  .trace-canvas > svg { display: none; }
  .trace-nodes { display: flex; flex-direction: column; justify-content: center; gap: 20px; padding: 30px; }
  .trace-nodes::before { position: absolute; top: 56px; bottom: 56px; left: 49px; border-left: 2px dashed var(--blue); content: ""; }
  .trace-node { position: relative; z-index: 1; top: auto; right: auto; bottom: auto; left: auto; width: min(100%, 210px); margin: 0; }
  .trace-node:nth-child(even) { align-self: flex-end; }
  .trace-note { display: none; }
  .expertise-list { justify-content: flex-start; overflow-x: auto; }
  .home-section { padding-block: 80px 90px; }
  .home-content-grid { grid-template-columns: 1fr; gap: 55px; }
  .topic-index { margin-top: 0; }
  .section-heading { align-items: flex-start; flex-direction: column; }
  .note-inner { min-height: 330px; grid-template-columns: 1fr; align-content: center; gap: 20px; padding-block: 55px; }
  .note-inner > a { grid-column: auto; margin: 7px 0 0; }
  .archive-list .post-card { display: block; padding-right: 28px; }
  .archive-list .post-card-meta { flex-direction: row; }
  .taxonomy-group { grid-template-columns: 1fr; gap: 25px; }
  .category-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .stack-panel { grid-row: 1; }
  .post-hero { padding-block: 59px 46px; }
  .back-link { margin-bottom: 41px; }
  .reading-progress { top: 63px; }
  .post-body { font-size: 1rem; }
  .post-pagination { grid-template-columns: 1fr; }
  .post-pagination .next { grid-column: 1; }
}

@media (max-width: 520px) {
  .shell,
  .shell-narrow { width: min(calc(100% - 28px), var(--shell)); }
  .site-brand { font-size: 1.07rem; }
  .eyebrow span:last-child { display: none; }
  .hero h1 { font-size: 3.25rem; }
  .trace-toolbar { grid-template-columns: 1fr auto; }
  .trace-toolbar code { display: none; }
  .post-card { padding-right: 22px; }
  .post-card h3 { font-size: 1.38rem; }
  .page-hero { padding-block: 75px 54px; }
  .page-hero h1 { font-size: 3.3rem; }
  .taxonomy-group li { grid-template-columns: 1fr; gap: 3px; }
  .category-card { padding: 23px; }
  .about-hero { padding-block: 76px 62px; }
  .about-hero h1 { font-size: 3.35rem; }
  .about-grid { padding-block: 70px 90px; }
  .post-hero h1 { font-size: 2.65rem; }
  .post-body pre { margin-inline: -14px; border-radius: 0; }
  .post-body table { display: block; overflow-x: auto; }
  .author-card { grid-template-columns: 1fr; }
  .not-found > div { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { grid-row: 2; }
  .copyright { grid-row: 3; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

@media print {
  .site-header,
  .site-footer,
  .reading-progress,
  .post-pagination,
  .back-link { display: none; }
  body { background: #fff; color: #111; }
  .post-hero,
  .post-body { width: 100%; }
  .post-body a { color: inherit; }
}