:root {
  --bg: #f8fafc;
  --bg-soft: #eef4f9;
  --paper: #ffffff;
  --ink: #112033;
  --ink-soft: #3d5266;
  --ink-muted: #6b7f96;
  --line: #dbe5ef;
  --accent: #0e6f95;
  --accent-strong: #0a4f6a;
  --accent-soft: #e5f2f8;
  --ok: #146a4d;
  --warn: #8a5a19;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(13, 30, 44, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: radial-gradient(circle at top right, #e7f2fa 0%, var(--bg) 38%);
  color: var(--ink);
  font-family: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(8px);
}

.nav-inner {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  text-decoration: none;
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 700;
}

.logo-dot {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-links a.active {
  color: var(--accent-strong);
}

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.page-head {
  padding: 2.2rem 0 1.2rem;
}

.page-kicker {
  margin: 0;
  color: var(--accent-strong);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 700;
}

h1 {
  margin: 0.2rem 0 0.7rem;
  font-size: clamp(1.8rem, 3.1vw, 2.5rem);
  line-height: 1.15;
}

.page-subtitle {
  margin: 0;
  max-width: 75ch;
  color: var(--ink-soft);
}

.callout {
  border: 1px solid #c8dfeb;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  margin-top: 1rem;
  font-size: 0.92rem;
}

.section {
  margin: 1.1rem 0;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
}

.section h2 {
  margin-top: 0;
  margin-bottom: 0.65rem;
  font-size: 1.2rem;
}

.section h3 {
  margin-top: 1rem;
  margin-bottom: 0.45rem;
  font-size: 1rem;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.step {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fbfdff;
  padding: 0.75rem 0.8rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.step:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 12px rgba(14, 111, 149, 0.08);
}

.step h3 {
  margin-top: 0;
  font-size: 0.98rem;
  color: var(--accent-strong);
}

code,
pre,
kbd {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
}

code {
  border-radius: 4px;
  background: #e9f1f8;
  padding: 0.12rem 0.3rem;
  color: var(--ink);
}

pre {
  margin: 0.55rem 0 0.2rem;
  border-radius: 7px;
  border: 1px solid #1a3040;
  background: #0f1f2a;
  color: #e8f3ff;
  padding: 0.7rem 0.8rem;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.55;
  position: relative;
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  border-radius: 0;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 0.55rem 0.6rem;
  vertical-align: top;
}

th {
  background: var(--bg-soft);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #405566;
  font-weight: 600;
}

tbody tr {
  transition: background-color 0.12s;
}

tbody tr:hover {
  background: #f4f8fc;
}

.badge {
  display: inline-block;
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 600;
}

.badge.ok {
  color: var(--ok);
  background: #e7f6ef;
}

.badge.warn {
  color: var(--warn);
  background: #fff4e4;
}

.diagram {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fcfeff;
  padding: 0.9rem;
  overflow: auto;
}

svg text {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
}

footer {
  margin: 1.4rem 0 2.2rem;
  color: #53687c;
  font-size: 0.83rem;
}

.footer-links {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--accent-strong);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* ====== Links in content ====== */

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

.section a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
}

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

footer a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
}

/* ====== Focus states for accessibility ====== */

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

/* ====== Section h3 subtle numbering ====== */

.section h3 {
  color: var(--ink);
}

/* ====== List refinements ====== */

.section ul,
.section ol {
  color: var(--ink-soft);
  line-height: 1.65;
}

.section li {
  margin-bottom: 0.3rem;
}

.section li code {
  font-size: 0.88em;
}

@media (max-width: 860px) {
  .step-grid {
    grid-template-columns: 1fr;
  }

  table {
    min-width: 640px;
  }
}