/* jerrodbaker.com
   Palette and type follow the operator-blog lineage the owner picked:
   GitHub dark ground, electric blue accent, bold sans headlines, mono labels.
   No serif, no gold, no numbered section kickers. */

:root {
  --bg: #0d1117;
  --bg-2: #12181f;
  --surface: #161b22;
  --surface-2: #1c232c;
  --line: #21262d;
  --line-2: #2d333b;
  --text: #e6edf3;
  --muted: #8b949e;
  --dim: #6e7681;
  --blue: #58a6ff;
  --blue-dim: #1f6feb;
  --cyan: #39d0d8;
  --red: #f85149;
  --green: #3fb950;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --wrap: 64rem;
  --pad: 1.5rem;
  --r: 6px;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 2px; }
img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--pad); width: 100%; }

.skip {
  position: absolute; top: -100%; left: var(--pad); z-index: 200;
  background: var(--blue); color: #06090d; font-weight: 600;
  padding: .5rem 1rem; border-radius: var(--r);
}
.skip:focus { top: .75rem; }

/* Header ------------------------------------------------------------------ */

.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13, 17, 23, .88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: var(--wrap); margin: 0 auto; padding: .7rem var(--pad);
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand {
  font-family: var(--mono); font-size: .85rem; font-weight: 500;
  color: var(--text); letter-spacing: .02em; white-space: nowrap;
}
.brand:hover { text-decoration: none; color: var(--blue); }
.brand .prompt { color: var(--blue); margin-right: .1rem; }
.brand .caret {
  display: inline-block; width: .5em; height: 1.05em; margin-left: .15rem;
  background: var(--blue); vertical-align: text-bottom; opacity: .9;
  animation: blink 1.15s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.topnav { display: flex; align-items: center; gap: .35rem; flex-wrap: wrap; }
.topnav a {
  font-size: .85rem; color: var(--muted);
  padding: .35rem .6rem; border-radius: var(--r); white-space: nowrap;
}
.topnav a:hover { color: var(--text); background: var(--surface); text-decoration: none; }
.topnav a[aria-current] { color: var(--text); background: var(--surface); }

/* Hero -------------------------------------------------------------------- */

.hero { position: relative; padding: 4.5rem 0 3.25rem; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(60rem 26rem at 12% -10%, rgba(88, 166, 255, .11), transparent 62%),
    radial-gradient(44rem 22rem at 88% 8%, rgba(57, 208, 216, .07), transparent 60%);
}
.hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(88, 166, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(88, 166, 255, .045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(52rem 22rem at 30% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(52rem 22rem at 30% 0%, #000 30%, transparent 78%);
}
.hero-inner { position: relative; display: flex; align-items: flex-start; gap: 1.5rem; }

.avatar {
  flex: 0 0 auto; width: 74px; height: 74px; border-radius: 50%;
  overflow: hidden; border: 1px solid var(--line-2); background: var(--surface);
}
.avatar img {
  width: 100%; height: 100%; object-fit: cover; object-position: 50% 18%;
  filter: grayscale(.7) contrast(1.08) brightness(.95);
}

.eyebrow {
  margin: 0 0 .55rem; font-family: var(--mono); font-size: .74rem;
  letter-spacing: .16em; text-transform: uppercase; color: var(--blue);
}
h1 {
  margin: 0 0 .5rem; font-size: clamp(2.1rem, 5.4vw, 3.35rem);
  font-weight: 700; line-height: 1.06; letter-spacing: -.022em;
}
.role {
  margin: 0 0 1.15rem; font-family: var(--mono); font-size: .9rem;
  color: var(--muted);
}
.role b { color: var(--text); font-weight: 500; }
.lead { margin: 0 0 .9rem; max-width: 42rem; color: var(--text); font-size: 1.06rem; }
.sub { margin: 0 0 1.6rem; max-width: 40rem; color: var(--muted); font-size: .96rem; }

.cta-row { display: flex; flex-wrap: wrap; gap: .6rem; }
.btn {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .55rem 1rem; border-radius: var(--r);
  font-family: var(--mono); font-size: .82rem; font-weight: 500;
  border: 1px solid var(--line-2); color: var(--text); background: var(--surface);
  transition: border-color .15s, background .15s, color .15s;
}
.btn:hover { border-color: var(--blue); color: var(--blue); text-decoration: none; }
.btn-primary { background: var(--blue-dim); border-color: var(--blue-dim); color: #fff; }
.btn-primary:hover { background: var(--blue); border-color: var(--blue); color: #06090d; }

/* Playgrounds: CSS-only tabs, no JavaScript ------------------------------- */

.section { padding: 3rem 0; border-top: 1px solid var(--line); }
.kicker {
  margin: 0 0 1rem; font-family: var(--mono); font-size: .74rem;
  letter-spacing: .16em; text-transform: uppercase; color: var(--dim);
}
.h2 { margin: 0 0 .6rem; font-size: 1.5rem; font-weight: 600; letter-spacing: -.01em; }
.section-lead { margin: 0 0 1.5rem; max-width: 44rem; color: var(--muted); }

.pg { position: relative; }
.pg input { position: absolute; opacity: 0; pointer-events: none; }
.pg-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.1rem; }
.pg-tabs label {
  cursor: pointer; user-select: none;
  padding: .45rem .9rem; border-radius: 999px;
  border: 1px solid var(--line-2); background: var(--surface);
  font-size: .875rem; color: var(--muted);
  transition: border-color .15s, color .15s, background .15s;
}
.pg-tabs label:hover { color: var(--text); border-color: var(--dim); }
.pg-panel { display: none; }
.pg-panel-body {
  border: 1px solid var(--line-2); border-radius: var(--r);
  background: var(--surface); padding: 1.3rem 1.4rem;
}
.pg-panel h3 {
  margin: 0 0 .5rem; font-family: var(--mono); font-size: .95rem;
  font-weight: 500; color: var(--blue);
}
.pg-panel p { margin: 0; color: var(--muted); }
.pg-panel p + p { margin-top: .7rem; }

/* wire each radio to its tab label and panel */
#pg1:checked ~ .pg-tabs label[for="pg1"],
#pg2:checked ~ .pg-tabs label[for="pg2"],
#pg3:checked ~ .pg-tabs label[for="pg3"],
#pg4:checked ~ .pg-tabs label[for="pg4"],
#pg5:checked ~ .pg-tabs label[for="pg5"],
#pg6:checked ~ .pg-tabs label[for="pg6"] {
  color: var(--text); border-color: var(--blue); background: rgba(88, 166, 255, .1);
}
#pg1:checked ~ .pg-panels #p1,
#pg2:checked ~ .pg-panels #p2,
#pg3:checked ~ .pg-panels #p3,
#pg4:checked ~ .pg-panels #p4,
#pg5:checked ~ .pg-panels #p5,
#pg6:checked ~ .pg-panels #p6 { display: block; }
.pg input:focus-visible ~ .pg-tabs label[for] { outline: none; }
#pg1:focus-visible ~ .pg-tabs label[for="pg1"],
#pg2:focus-visible ~ .pg-tabs label[for="pg2"],
#pg3:focus-visible ~ .pg-tabs label[for="pg3"],
#pg4:focus-visible ~ .pg-tabs label[for="pg4"],
#pg5:focus-visible ~ .pg-tabs label[for="pg5"],
#pg6:focus-visible ~ .pg-tabs label[for="pg6"] { outline: 2px solid var(--blue); outline-offset: 2px; }

/* Generic lists ----------------------------------------------------------- */

.stack { list-style: none; margin: 0; padding: 0; display: grid; gap: .75rem; }
.stack li {
  border: 1px solid var(--line); border-radius: var(--r);
  background: var(--surface); padding: 1.05rem 1.2rem;
}
.stack h3 {
  margin: 0 0 .35rem; font-family: var(--mono); font-size: .88rem;
  font-weight: 500; color: var(--text);
}
.stack p { margin: 0; font-size: .9rem; color: var(--muted); }

.meta-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .6rem 1.5rem; margin: 1.2rem 0 0; }
.meta-grid div { border-top: 1px solid var(--line); padding-top: .6rem; }
.meta-grid dt {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--dim); margin-bottom: .15rem;
}
.meta-grid dd { margin: 0; font-size: .9rem; }

.links { display: flex; flex-wrap: wrap; gap: .6rem; }

/* Writeups ---------------------------------------------------------------- */

.post-list { list-style: none; margin: 1.5rem 0 0; padding: 0; display: grid; gap: .8rem; }
.post-card {
  display: block; padding: 1.15rem 1.3rem;
  border: 1px solid var(--line); border-radius: var(--r); background: var(--surface);
  transition: border-color .15s, background .15s;
}
.post-card:hover { border-color: var(--blue); background: var(--surface-2); text-decoration: none; }
.post-card-meta, .post-meta {
  margin: 0 0 .4rem; font-family: var(--mono); font-size: .74rem; color: var(--dim);
}
.post-card h2 { margin: 0 0 .4rem; font-size: 1.2rem; font-weight: 600; color: var(--text); }
.post-card-summary { margin: 0; font-size: .92rem; color: var(--muted); }

.tags { list-style: none; display: flex; flex-wrap: wrap; gap: .35rem; margin: .8rem 0 0; padding: 0; }
.tags li {
  font-family: var(--mono); font-size: .7rem; color: var(--blue);
  border: 1px solid var(--line-2); border-radius: 999px;
  padding: .12rem .55rem; background: rgba(88, 166, 255, .07);
}

.empty {
  margin-top: 1.5rem; padding: 1.5rem; border: 1px dashed var(--line-2);
  border-radius: var(--r); background: var(--surface); max-width: 44rem;
}
.empty p { margin: 0 0 .8rem; color: var(--muted); }
.empty p:last-child { margin-bottom: 0; }

/* Post page --------------------------------------------------------------- */

.post-head { padding: 2.5rem var(--pad) 1.4rem; border-bottom: 1px solid var(--line); }
.post-title { margin: 0 0 .5rem; font-size: clamp(1.7rem, 4.2vw, 2.5rem); font-weight: 700; line-height: 1.12; letter-spacing: -.02em; }
.post-grid { display: grid; grid-template-columns: minmax(0, 1fr) 15rem; gap: 3rem; align-items: start; padding: 2rem var(--pad); }
.toc { position: sticky; top: 4.5rem; order: 2; }
.toc-title { margin: 0 0 .6rem; font-family: var(--mono); font-size: .7rem; letter-spacing: .14em; text-transform: uppercase; color: var(--dim); }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line-2); }
.toc a { display: block; padding: .28rem 0 .28rem .8rem; font-size: .84rem; color: var(--muted); border-left: 1px solid transparent; margin-left: -1px; }
.toc a:hover { color: var(--blue); border-left-color: var(--blue); text-decoration: none; }
.toc-l3 a { padding-left: 1.5rem; font-size: .8rem; }
.post-foot { padding-bottom: 3rem; }

.prose { max-width: 44rem; font-size: 1rem; line-height: 1.75; color: #c9d1d9; }
.prose > *:first-child { margin-top: 0; }
.prose h2 { margin: 2.4rem 0 .8rem; font-size: 1.4rem; font-weight: 600; color: var(--text); scroll-margin-top: 5rem; }
.prose h3 { margin: 1.8rem 0 .6rem; font-size: 1.08rem; font-weight: 600; color: var(--text); scroll-margin-top: 5rem; }
.prose p { margin: 0 0 1.05rem; }
.prose ul, .prose ol { margin: 0 0 1.05rem; padding-left: 1.3rem; }
.prose li { margin-bottom: .35rem; }
.prose li::marker { color: var(--blue); }
.prose strong { color: var(--text); font-weight: 600; }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 2.2rem 0; }
.prose blockquote {
  margin: 1.3rem 0; padding: .8rem 1.1rem;
  border-left: 3px solid var(--blue); background: rgba(88, 166, 255, .06);
  border-radius: 0 var(--r) var(--r) 0; color: var(--muted);
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose code {
  font-family: var(--mono); font-size: .86em;
  background: var(--surface-2); border: 1px solid var(--line-2);
  border-radius: 4px; padding: .1em .35em; color: var(--cyan);
}
.prose pre {
  margin: 1.3rem 0; padding: 1rem 1.15rem;
  background: #0b0f14; border: 1px solid var(--line-2); border-radius: var(--r);
  overflow-x: auto; font-size: .84rem; line-height: 1.6;
}
.prose pre code { background: none; border: none; padding: 0; font-size: inherit; color: #c9d1d9; }
.prose table { width: 100%; margin: 0; border-collapse: collapse; font-size: .9rem; }
.prose th, .prose td { padding: .55rem .75rem; border: 1px solid var(--line-2); text-align: left; }
.prose th { background: var(--surface); font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--blue); }

/* Syntax highlighting, GitHub-dark family */
.hljs-comment, .hljs-quote { color: #8b949e; font-style: italic; }
.hljs-keyword, .hljs-selector-tag { color: #ff7b72; }
.hljs-string, .hljs-attr { color: #a5d6ff; }
.hljs-number, .hljs-literal { color: #79c0ff; }
.hljs-title, .hljs-section, .hljs-built_in, .hljs-name { color: #d2a8ff; }
.hljs-variable, .hljs-params { color: #ffa657; }
.hljs-type, .hljs-attribute { color: #79c0ff; }
.hljs-meta, .hljs-symbol, .hljs-bullet { color: #58a6ff; }

/* Article components ------------------------------------------------------ */

/* Heading permalinks: quiet until the heading is hovered or the link is
   focused, so they never compete with the heading itself. */
.hanchor {
  margin-left: .45rem; font-family: var(--mono); font-weight: 400;
  color: var(--dim); opacity: 0; text-decoration: none;
  transition: opacity 140ms ease, color 140ms ease;
}
.prose h2:hover .hanchor,
.prose h3:hover .hanchor,
.hanchor:focus-visible { opacity: 1; }
.hanchor:hover { color: var(--blue); text-decoration: none; }

/* Code blocks */
.prose .code { margin: 1.3rem 0; }
.prose .code pre { margin: 0; border-radius: 0 0 var(--r) var(--r); border-top: none; }
.code-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .35rem .5rem .35rem .9rem;
  background: var(--surface); border: 1px solid var(--line-2);
  border-radius: var(--r) var(--r) 0 0;
}
.code-lang {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--dim);
}
.code-copy {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .04em;
  color: var(--muted); background: transparent;
  border: 1px solid var(--line-2); border-radius: 4px;
  padding: .25rem .55rem; cursor: pointer;
  transition: color 140ms ease, border-color 140ms ease;
}
.code-copy:hover { color: var(--blue); border-color: var(--blue); }
.code-copy.is-copied { color: var(--green); border-color: var(--green); }

/* Callouts. The label carries the meaning; color only reinforces it. */
.callout {
  margin: 1.3rem 0; padding: .85rem 1.1rem;
  border: 1px solid var(--line-2); border-left-width: 3px;
  border-radius: 0 var(--r) var(--r) 0; background: var(--surface);
}
.callout p { margin: 0 0 .6rem; }
.callout p:last-child { margin-bottom: 0; }
.callout-label {
  font-family: var(--mono); font-size: .7rem; letter-spacing: .12em;
  text-transform: uppercase;
}
.callout-note { border-left-color: var(--blue); }
.callout-note .callout-label { color: var(--blue); }
.callout-warning { border-left-color: #d29922; }
.callout-warning .callout-label { color: #d29922; }
.callout-outcome { border-left-color: var(--green); }
.callout-outcome .callout-label { color: var(--green); }
.callout-prerequisite { border-left-color: var(--dim); }
.callout-prerequisite .callout-label { color: var(--muted); }

/* Tables scroll inside a focusable region so keyboard users can reach the
   overflow without a mouse. */
.table-scroll { margin: 1.3rem 0; overflow-x: auto; border: 1px solid var(--line-2); border-radius: var(--r); }
.table-scroll:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.prose .table-scroll th, .prose .table-scroll td { border: none; border-bottom: 1px solid var(--line-2); }
.prose .table-scroll tr:last-child td { border-bottom: none; }

.post-verified {
  margin: 2rem 0 0; padding-top: 1rem; border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: .76rem; color: var(--dim);
}

/* Contents rail, now a disclosure so it can collapse on narrow screens. */
.toc > summary {
  cursor: pointer; list-style: none;
  margin: 0 0 .6rem;
  font-family: var(--mono); font-size: .7rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--dim);
}
.toc > summary::-webkit-details-marker { display: none; }
.toc > summary::after { content: ' +'; }
.toc[open] > summary::after { content: ' -'; }
.toc > summary:hover { color: var(--blue); }
.toc a.is-active { color: var(--blue); border-left-color: var(--blue); }

/* Previous / next. Rendered only when a neighbouring writeup exists. */
.post-nav {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem; margin: 0 0 1.5rem;
}
.post-nav-link {
  display: flex; flex-direction: column; gap: .3rem;
  padding: .85rem 1rem; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--r);
}
.post-nav-link:hover { border-color: var(--blue); background: var(--surface-2); text-decoration: none; }
.post-nav-next { text-align: right; }
.post-nav-dir {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--dim);
}
.post-nav-title { font-size: .95rem; font-weight: 600; color: var(--text); }
/* A lone neighbour keeps its side rather than stretching across the row. */
.post-nav-next:only-child { grid-column: 2; }
.hljs-addition { color: #3fb950; }
.hljs-deletion { color: #f85149; }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 600; }

/* Footer ------------------------------------------------------------------ */

.foot { padding: 2rem 0; border-top: 1px solid var(--line); }
.foot-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.foot p { margin: 0; font-family: var(--mono); font-size: .78rem; color: var(--dim); }

/* Responsive -------------------------------------------------------------- */

@media (max-width: 860px) {
  .post-grid { grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .toc { position: static; order: 0; padding: .9rem 1rem; border: 1px solid var(--line-2); border-radius: var(--r); background: var(--surface); }
  .toc ol { border-left: none; }
  .toc a { padding-left: 0; }
  .toc-l3 a { padding-left: .8rem; }
}

@media (max-width: 620px) {
  .hero { padding: 2.5rem 0 2rem; }
  .hero-inner { flex-direction: column; gap: 1.1rem; }
  .avatar { width: 60px; height: 60px; }
  .meta-grid { grid-template-columns: 1fr; }
  .topbar-inner { flex-wrap: wrap; gap: .5rem; }
  .topnav { width: 100%; gap: .15rem; margin-left: -.6rem; }
  .topnav a { font-size: .8rem; padding: .3rem .5rem; }
  .section { padding: 2.25rem 0; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav-next { text-align: left; }
  .post-nav-next:only-child { grid-column: 1; }
  .hanchor { opacity: 1; }
}

/* Signature mark + hero artwork ------------------------------------------- */

.brand { display: inline-flex; align-items: center; gap: .5rem; }
.brand-mark { width: 24px; height: 24px; flex: 0 0 auto; }

.hero-art {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image: url('/signature-art.png');
  background-repeat: no-repeat;
  background-position: right -3rem center;
  background-size: auto 118%;
  /* the artwork ships on opaque black, which composites darker than the page and
     leaves a visible rectangle. screen drops the black out and keeps the glow. */
  mix-blend-mode: screen;
  opacity: .55;
  mask-image: linear-gradient(90deg, transparent 4%, #000 55%);
  -webkit-mask-image: linear-gradient(90deg, transparent 4%, #000 55%);
}
.hero-inner { position: relative; z-index: 1; }

@media (max-width: 900px) {
  .hero-art { background-position: right -5rem top -1rem; background-size: auto 88%; opacity: .38; }
}
@media (max-width: 620px) {
  .hero-art { background-position: right -6rem top -2rem; background-size: auto 66%; opacity: .3; }
}