/* How-built case study — relative assets only, no CDN */
:root {
  --bg: #0e1419;
  --bg-2: #162028;
  --ink: #e8eef3;
  --muted: #9aafbd;
  --accent: #3db8a8;
  --accent-2: #f0a06a;
  --line: #2a3a46;
  --code-bg: #0a1014;
  --warn: #e8c07a;
  --ok: #7dcb9a;
  --fail: #e07a7a;
  --radius: 10px;
  --max: 46rem;
  --font: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Avenir Next", "Segoe UI", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .pipeline path,
  .pipeline .flow {
    animation: none !important;
  }
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #1a3340 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #2a2218 0%, transparent 50%),
    var(--bg);
  min-height: 100vh;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  padding: 0.5rem 0.85rem;
  background: var(--accent);
  color: #062018;
  font-weight: 700;
  text-decoration: none;
  border-radius: 6px;
  z-index: 100;
  transform: translateY(-160%);
}

.skip:focus {
  transform: translateY(0);
  outline: 3px solid var(--accent-2);
  outline-offset: 2px;
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
  padding-block: 2.5rem 4rem;
}

header.hero {
  margin-bottom: 2.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.6rem;
  font-weight: 700;
}

h1 {
  font-family: var(--font);
  font-size: clamp(1.7rem, 4.5vw, 2.45rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
  font-weight: 700;
}

.lede {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}

.meta {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

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

nav.toc {
  margin: 1.5rem 0 2rem;
  padding: 1rem 1.1rem;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

nav.toc h2 {
  font-size: 0.85rem;
  margin: 0 0 0.5rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

nav.toc ol {
  margin: 0;
  padding-left: 1.2rem;
}

nav.toc a {
  color: var(--ink);
  text-decoration-color: var(--line);
}

nav.toc a:hover,
nav.toc a:focus-visible {
  color: var(--accent);
}

section {
  margin: 2.5rem 0;
  scroll-margin-top: 1rem;
}

h2 {
  font-family: var(--font);
  font-size: clamp(1.25rem, 3vw, 1.55rem);
  margin: 0 0 0.85rem;
  color: var(--ink);
}

h3 {
  font-size: 1.05rem;
  margin: 1.4rem 0 0.5rem;
}

p,
li {
  color: var(--ink);
}

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

.cite {
  font-family: var(--mono);
  font-size: 0.78em;
  color: var(--accent-2);
  white-space: nowrap;
}

.arch {
  margin: 1rem 0;
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--accent);
  background: var(--bg-2);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 1.02rem;
}

.pipeline {
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 1.25rem 0;
  display: block;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.pipeline .box {
  fill: #1a2832;
  stroke: var(--accent);
  stroke-width: 1.5;
}

.pipeline text {
  fill: var(--ink);
  font-family: var(--sans);
  font-size: 11px;
}

.pipeline .arrow {
  stroke: var(--accent-2);
  stroke-width: 2;
  fill: none;
  marker-end: url(#arrowhead);
}

.pipeline .flow {
  stroke-dasharray: 6 4;
  animation: dash 1.2s linear infinite;
}

@keyframes dash {
  to {
    stroke-dashoffset: -20;
  }
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 1rem 0;
}

th,
td {
  text-align: left;
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

tr:hover td {
  background: rgba(61, 184, 168, 0.06);
}

code,
.mono {
  font-family: var(--mono);
  font-size: 0.88em;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.45;
}

.lab {
  margin: 1.25rem 0;
  padding: 1.1rem 1.15rem 1.25rem;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.lab label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.65rem;
}

.lab input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  height: 1.5rem;
}

.lab-out {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  gap: 0.65rem;
  margin-top: 0.9rem;
}

.lab-out div {
  padding: 0.55rem 0.7rem;
  background: var(--code-bg);
  border-radius: 8px;
  border: 1px solid var(--line);
}

.lab-out dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0;
}

.lab-out dd {
  margin: 0.15rem 0 0;
  font-family: var(--mono);
  font-size: 1.05rem;
  color: var(--accent);
}

.chapter-chip {
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: rgba(61, 184, 168, 0.18);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}

.callout {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #1a1c14;
}

.callout.warn {
  border-color: #5a4a28;
  background: #221e14;
}

.callout strong {
  color: var(--warn);
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: ck;
}

.checklist li {
  counter-increment: ck;
  position: relative;
  padding: 0.7rem 0.75rem 0.7rem 2.6rem;
  margin: 0.45rem 0;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.checklist li::before {
  content: counter(ck);
  position: absolute;
  left: 0.65rem;
  top: 0.65rem;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 50%;
  background: var(--accent);
  color: #062018;
  font-weight: 800;
  font-size: 0.8rem;
  display: grid;
  place-items: center;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--muted);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 390px) {
  .wrap {
    width: calc(100% - 1.25rem);
  }
  table {
    font-size: 0.8rem;
  }
  th,
  td {
    padding: 0.4rem 0.35rem;
  }
}

@media print {
  body {
    background: #fff;
    color: #111;
  }
  .lab,
  nav.toc {
    break-inside: avoid;
  }
}