@font-face {
  font-family: "Sarabun";
  src: url("fonts/Sarabun-Regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Sarabun";
  src: url("fonts/Sarabun-SemiBold.woff2") format("woff2");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "Anuphan";
  src: url("fonts/Anuphan-Variable.woff2") format("woff2");
  font-style: normal;
  font-weight: 500 700;
  font-display: swap;
}

:root {
  color-scheme: light;
  --color-paper: #F6F4EF;
  --color-surface: #FDFCF9;
  --color-ink: #1A2438;
  --color-muted: #5A6478;
  --color-primary: #1E3A5F;
  --color-primary-strong: #14283F;
  --color-accent: #B0894E;
  --color-accent-text: #76572C;
  --color-accent-soft: #F1E7D2;
  --color-line: #E2DDCE;
  --color-soft: #ECEADF;
  --color-mint: #DEE4EC;
  --hero-from: #FBF8F1;
  --hero-to: #EFE6D3;
  --hero-ink: #16233C;
  --hero-muted: #4A5468;
  --shadow-soft: 0 18px 44px rgba(30, 58, 95, 0.08);
  --shadow-raised: 0 18px 54px rgba(20, 40, 63, 0.14);
  --font-body: "Sarabun", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Anuphan", "Sarabun", system-ui, sans-serif;
  --reading-width: 48rem;
  --wide-width: 72rem;
  --header-height: 4.5rem;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --color-paper: #101722;
  --color-surface: #182231;
  --color-ink: #F3F0E8;
  --color-muted: #B8C1CF;
  --color-primary: #B7CAE2;
  --color-primary-strong: #D8E5F3;
  --color-accent: #D4B678;
  --color-accent-text: #E0C78D;
  --color-accent-soft: #332D21;
  --color-line: #344255;
  --color-soft: #222D3B;
  --color-mint: #263647;
  --hero-from: #172231;
  --hero-to: #29281F;
  --hero-ink: #F6F1E6;
  --hero-muted: #C6CED9;
  --shadow-soft: 0 18px 44px rgba(0, 0, 0, 0.2);
  --shadow-raised: 0 20px 64px rgba(0, 0, 0, 0.32);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1.25rem);
  background: var(--color-paper);
}

body {
  margin: 0;
  min-width: 20rem;
  background:
    radial-gradient(circle at 10% -10%, color-mix(in srgb, var(--color-accent-soft) 58%, transparent), transparent 27rem),
    var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 0.08em;
}

a:hover {
  color: var(--color-primary-strong);
}

button,
input {
  font: inherit;
}

button,
a,
input,
[tabindex] {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

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

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1000;
  transform: translateY(-180%);
  padding: 0.7rem 1rem;
  border-radius: 999px;
  background: var(--color-primary-strong);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 600;
  text-decoration: none;
}

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

.reading-progress {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 110;
  width: var(--reading-progress, 0%);
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid color-mix(in srgb, var(--color-line) 78%, transparent);
  background: color-mix(in srgb, var(--color-paper) 88%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.5rem;
  width: min(100% - 2rem, var(--wide-width));
  min-height: var(--header-height);
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 44px;
  color: var(--color-ink);
  font-family: var(--font-display);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.3rem;
  aspect-ratio: 1;
  border: 1px solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-primary);
  font-size: 1.02rem;
  font-weight: 700;
  box-shadow: 0 5px 20px rgba(30, 58, 95, 0.08);
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.25;
}

.brand small {
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
}

.primary-navigation {
  display: flex;
  justify-content: center;
  gap: 0.25rem;
}

.primary-navigation a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.45rem 0.72rem;
  border-radius: 999px;
  color: var(--color-muted);
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
}

.primary-navigation a:hover,
.primary-navigation a[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-primary-strong);
}

.header-actions {
  display: flex;
  gap: 0.35rem;
}

.icon-button,
.menu-button {
  display: inline-grid;
  place-items: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-primary);
  cursor: pointer;
}

.icon-button:hover,
.menu-button:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.menu-button {
  display: none;
}

main {
  min-height: 70vh;
}

.page-container {
  width: min(100% - 2rem, var(--reading-width));
  margin: 0 auto;
  padding: 2rem 0 5rem;
}

.breadcrumbs {
  margin-bottom: 1.2rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.4rem;
  color: var(--color-accent);
}

.breadcrumbs a {
  color: inherit;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.6rem, 5vw, 3rem);
  border: 1px solid color-mix(in srgb, var(--color-accent) 25%, var(--color-line));
  border-radius: 1.75rem;
  background:
    radial-gradient(circle at 88% 8%, color-mix(in srgb, var(--color-accent) 22%, transparent), transparent 13rem),
    linear-gradient(135deg, var(--hero-from), var(--hero-to));
  box-shadow: var(--shadow-soft);
}

.page-hero::after {
  content: "";
  position: absolute;
  right: -2rem;
  bottom: -4rem;
  width: 12rem;
  aspect-ratio: 1;
  border: 1px solid color-mix(in srgb, var(--color-accent) 40%, transparent);
  border-radius: 50%;
  opacity: 0.7;
}

.page-hero h1 {
  position: relative;
  z-index: 1;
  max-width: 15ch;
  margin: 0;
  color: var(--hero-ink);
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.22;
  text-wrap: balance;
}

.page-description {
  position: relative;
  z-index: 1;
  max-width: 38rem;
  margin: 1rem 0 0;
  color: var(--hero-muted);
  font-size: clamp(1.05rem, 2.8vw, 1.22rem);
  line-height: 1.75;
}

.page-part,
.eyebrow {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin: 0 0 0.8rem;
  color: var(--color-accent-text);
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.editorial-illustration,
.route-visual {
  margin: 2rem 0;
  break-inside: avoid;
}

.editorial-illustration {
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: 1.5rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.editorial-illustration img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--color-accent-soft);
}

.editorial-illustration figcaption,
.route-visual figcaption,
.tmux-house-window figcaption {
  padding: 0.85rem 1.1rem 1rem;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.route-visual {
  padding: clamp(1.25rem, 4vw, 2rem);
  border: 1px solid var(--color-line);
  border-radius: 1.5rem;
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--color-surface) 90%, var(--color-mint)), var(--color-surface));
  box-shadow: var(--shadow-soft);
}

.route-visual-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-line);
}

.route-visual-heading .eyebrow {
  flex: 0 0 auto;
  margin: 0 0 0.25rem;
}

.route-visual h2 {
  margin: 0;
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 4vw, 1.85rem);
  line-height: 1.35;
  text-wrap: balance;
}

.route-visual-list {
  display: grid;
  gap: 0.8rem;
  padding: 0;
  margin: 1.25rem 0 0;
  list-style: none;
  counter-reset: visual-step;
}

.route-visual-item {
  display: grid;
  grid-template-columns: 2.35rem 1fr;
  gap: 0.85rem;
  align-items: start;
  padding: 1rem;
  border: 1px solid color-mix(in srgb, var(--color-line) 85%, transparent);
  border-radius: 1rem;
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
}

.visual-step {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-weight: 700;
}

.route-visual-item strong {
  display: block;
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-weight: 650;
  line-height: 1.45;
}

.route-visual-item p {
  margin: 0.2rem 0 0;
  color: var(--color-muted);
  font-size: 0.96rem;
  line-height: 1.65;
}

.route-visual--timeline .route-visual-list {
  position: relative;
}

.route-visual--timeline .route-visual-list::before {
  content: "";
  position: absolute;
  top: 1.2rem;
  bottom: 1.2rem;
  left: 1.15rem;
  width: 2px;
  background: color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
}

.route-visual--timeline .route-visual-item {
  position: relative;
  border-color: transparent;
  background: transparent;
}

.route-visual--timeline .visual-step {
  z-index: 1;
  background: var(--color-surface);
}

.route-visual--comparison .route-visual-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.route-visual--comparison .route-visual-item {
  grid-template-columns: 1fr;
}

.route-visual--comparison .visual-step {
  width: auto;
  height: auto;
  min-height: 0;
  border: 0;
  background: transparent;
  color: var(--color-accent-text);
  justify-content: start;
}

.content-layout {
  margin-top: 2rem;
}

.toc-card,
.related-card {
  padding: 1.2rem 1.35rem;
  border: 1px solid var(--color-line);
  border-radius: 1.25rem;
  background: var(--color-surface);
}

.toc-card {
  margin-bottom: 2rem;
}

.toc-card h2,
.related-card h2 {
  margin: 0 0 0.7rem;
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.toc-card ol,
.related-card ul {
  padding-left: 1.3rem;
  margin: 0;
}

.toc-card li + li,
.related-card li + li {
  margin-top: 0.4rem;
}

.prose {
  min-width: 0;
  font-size: 1.1375rem;
  line-height: 1.92;
  overflow-wrap: anywhere;
}

.prose > p:first-of-type {
  color: color-mix(in srgb, var(--color-ink) 88%, var(--color-muted));
  font-size: 1.24rem;
  line-height: 1.82;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
  scroll-margin-top: calc(var(--header-height) + 1.25rem);
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-weight: 650;
  line-height: 1.4;
  text-wrap: balance;
}

.prose h1 {
  font-size: 2rem;
}

.prose h2 {
  margin: 3rem 0 1rem;
  padding-top: 0.2rem;
  font-size: clamp(1.55rem, 5vw, 2rem);
}

.prose h3 {
  margin: 2.2rem 0 0.75rem;
  font-size: 1.35rem;
}

.prose h4 {
  margin: 1.75rem 0 0.65rem;
  font-size: 1.12rem;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose table,
.prose pre {
  margin-top: 1.1rem;
  margin-bottom: 1.1rem;
}

.prose li + li {
  margin-top: 0.4rem;
}

.prose strong {
  color: var(--color-primary-strong);
  font-weight: 600;
}

.prose blockquote {
  padding: 1rem 1.2rem;
  border: 0;
  border-left: 4px solid var(--color-accent);
  border-radius: 0 1rem 1rem 0;
  background: var(--color-accent-soft);
  color: var(--color-ink);
}

.prose blockquote > :first-child {
  margin-top: 0;
}

.prose blockquote > :last-child {
  margin-bottom: 0;
}

.prose hr {
  height: 1px;
  margin: 3rem 0;
  border: 0;
  background: var(--color-line);
}

.table-wrap,
.prose table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-spacing: 0;
  border-collapse: collapse;
  -webkit-overflow-scrolling: touch;
}

.prose table {
  width: 100%;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  background: var(--color-surface);
}

.prose th,
.prose td {
  min-width: 9rem;
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
  font-size: inherit;
  line-height: 1.65;
}

.prose th {
  background: var(--color-accent-soft);
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-weight: 650;
}

.prose tr:last-child td {
  border-bottom: 0;
}

.prose code {
  padding: 0.12em 0.35em;
  border: 1px solid var(--color-line);
  border-radius: 0.35rem;
  background: var(--color-soft);
  color: var(--color-primary-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86em;
}

.prose pre {
  position: relative;
  max-width: 100%;
  padding: 1.2rem;
  overflow-x: auto;
  border: 1px solid color-mix(in srgb, var(--color-primary) 52%, transparent);
  border-radius: 1rem;
  background: #152238;
  color: #EDF2F7;
  font-family: var(--font-body);
  font-size: inherit;
  line-height: 1.65;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

.prose pre code {
  display: block;
  padding: 0;
  padding-top: 3.25rem;
  border: 0;
  background: transparent;
  color: inherit;
  font-family: inherit;
  font-size: inherit;
}

.copy-button {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  min-height: 44px;
  padding: 0.45rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-family: var(--font-body);
  font-size: inherit;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(8px);
}

.copy-button:hover {
  background: rgba(255, 255, 255, 0.2);
}

.copy-button:focus-visible {
  outline-color: #fff;
  box-shadow: 0 0 0 3px rgba(21, 34, 56, 0.82);
}

.related-card {
  margin-top: 2.5rem;
  background: linear-gradient(135deg, var(--color-surface), color-mix(in srgb, var(--color-mint) 55%, var(--color-surface)));
}

.page-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.pager-link {
  display: flex;
  min-height: 5.5rem;
  flex-direction: column;
  justify-content: center;
  padding: 1rem 1.2rem;
  border: 1px solid var(--color-line);
  border-radius: 1.2rem;
  background: var(--color-surface);
  color: var(--color-primary-strong);
  text-decoration: none;
  box-shadow: var(--shadow-soft);
}

.pager-link:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.pager-link small {
  color: var(--color-muted);
}

.pager-next {
  text-align: right;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1.05rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 650;
  text-align: center;
  text-decoration: none;
}

.button-primary {
  background: var(--color-primary);
  color: #fff;
}

.button-primary:hover {
  background: var(--color-primary-strong);
  color: #fff;
}

.button-secondary {
  border-color: var(--color-primary);
  background: transparent;
  color: var(--color-primary);
}

.button-secondary:hover {
  background: var(--color-primary);
  color: #fff;
}

.section-heading {
  max-width: 42rem;
  margin-bottom: 1.5rem;
}

.section-heading h2,
.home-section h2 {
  margin: 0;
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 5vw, 2.35rem);
  line-height: 1.3;
  text-wrap: balance;
}

.section-heading p {
  margin: 0.7rem 0 0;
  color: var(--color-muted);
}

.home-section,
.tmux-explainer {
  margin: clamp(3rem, 8vw, 5rem) 0;
}

.outcome-grid,
.persona-grid,
.part-grid,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.outcome-card,
.persona-card,
.part-card,
.resource-card {
  padding: 1.25rem;
  border: 1px solid var(--color-line);
  border-radius: 1.35rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.outcome-card h3,
.persona-card h3,
.part-card h3,
.resource-card h3 {
  margin: 0;
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: 1.16rem;
  line-height: 1.45;
}

.outcome-card p,
.persona-card p,
.part-card p,
.resource-card p {
  margin: 0.5rem 0 0;
  color: var(--color-muted);
  line-height: 1.7;
}

.part-card a,
.persona-card a,
.resource-card a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 0.55rem;
  font-family: var(--font-display);
  font-weight: 600;
}

.content-index {
  display: grid;
  gap: 1.25rem;
}

.content-index-part {
  padding: clamp(1.25rem, 4vw, 1.8rem);
}

.content-index-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  padding: 0;
  margin: 1.15rem 0 0;
  list-style: none;
}

.content-index-list a {
  display: grid;
  gap: 0.2rem;
  align-content: center;
  min-height: 64px;
  padding: 0.75rem 0.9rem;
  margin: 0;
  border: 1px solid var(--color-line);
  border-radius: 0.9rem;
  background: color-mix(in srgb, var(--color-paper) 66%, var(--color-surface));
  color: var(--color-primary-strong);
  text-decoration: none;
}

.content-index-list a:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.content-index-list span {
  color: var(--color-accent-text);
  font-size: 0.78rem;
  font-weight: 600;
}

.content-index-list strong {
  font-family: var(--font-display);
  font-size: 0.95rem;
  line-height: 1.45;
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0 0;
}

.stat-strip div {
  padding: 0.9rem;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
  text-align: center;
}

.stat-strip strong,
.stat-strip span {
  display: block;
}

.stat-strip strong {
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: 1.5rem;
}

.stat-strip span {
  color: var(--color-muted);
  font-size: 0.82rem;
}

.tmux-explainer {
  padding: clamp(1.25rem, 4vw, 2.2rem);
  border: 1px solid var(--color-line);
  border-radius: 1.75rem;
  background: linear-gradient(140deg, var(--color-surface), color-mix(in srgb, var(--color-mint) 62%, var(--color-surface)));
  box-shadow: var(--shadow-soft);
}

.tmux-house-window {
  display: grid;
  grid-template-columns: minmax(8rem, 0.7fr) 2rem minmax(14rem, 1.5fr);
  align-items: center;
  gap: 0.6rem;
  margin: 1.5rem 0 0;
  break-inside: avoid;
}

.terminal-window {
  position: relative;
  min-height: 10rem;
  padding: 3.6rem 1rem 1rem;
  border: 6px solid var(--color-primary-strong);
  border-radius: 1rem;
  background: var(--color-surface);
  box-shadow: inset 0 0 0 1px var(--color-accent), var(--shadow-soft);
  text-align: center;
}

.terminal-window::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2.25rem;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-soft);
}

.window-dot {
  position: relative;
  z-index: 1;
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  margin-right: 0.25rem;
  border-radius: 50%;
  background: var(--color-accent);
  transform: translateY(-2.75rem);
}

.terminal-window strong,
.terminal-window small {
  display: block;
}

.terminal-window strong {
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: 1.3rem;
}

.terminal-window small {
  color: var(--color-muted);
}

.view-line {
  position: relative;
  height: 2px;
  background: var(--color-accent);
}

.view-line::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -4px;
  border-width: 5px 0 5px 8px;
  border-style: solid;
  border-color: transparent transparent transparent var(--color-accent);
}

.tmux-building {
  overflow: hidden;
  border: 2px solid var(--color-primary);
  border-radius: 1.2rem 1.2rem 0.7rem 0.7rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.building-label {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: var(--color-primary);
  color: #fff;
}

.building-label strong {
  font-family: var(--font-display);
}

.building-label span {
  font-size: 0.78rem;
}

.house-rooms {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.house-room {
  position: relative;
  min-height: 7rem;
  padding: 1rem;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.house-room:nth-child(2n) {
  border-right: 0;
}

.house-room:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.house-room strong,
.house-room span {
  display: block;
}

.house-room strong {
  color: var(--color-primary-strong);
  font-family: var(--font-display);
}

.house-room span {
  color: var(--color-muted);
  font-size: 0.82rem;
}

.house-room i {
  position: absolute;
  right: 0.8rem;
  bottom: 0.8rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: #4D8A6B;
  box-shadow: 0 0 0 4px color-mix(in srgb, #4D8A6B 20%, transparent);
}

.tmux-house-window figcaption {
  grid-column: 1 / -1;
  padding: 0.85rem 0 0;
}

.observe-command-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.2rem;
}

.safe-observe,
.active-command {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.75rem;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  background: var(--color-surface);
}

.safe-observe > span,
.active-command > span {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background: var(--color-mint);
  color: var(--color-primary);
}

.safe-observe strong,
.active-command strong {
  color: var(--color-primary-strong);
  font-family: var(--font-display);
}

.safe-observe p,
.active-command p {
  margin: 0.25rem 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.section-actions {
  margin: 1.2rem 0 0;
}

.glossary-tools {
  position: sticky;
  top: calc(var(--header-height) + 0.75rem);
  z-index: 10;
  padding: 0.75rem;
  margin: 1.5rem 0;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(16px);
}

.glossary-tools input,
.search-field input {
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-line);
  border-radius: 0.9rem;
  background: var(--color-surface);
  color: var(--color-ink);
}

[data-glossary-row][hidden] {
  display: none;
}

.glossary-list {
  display: grid;
  gap: 1rem;
}

.glossary-entry {
  scroll-margin-top: calc(var(--header-height) + 6rem);
  padding: 1.2rem 1.35rem;
  border: 1px solid var(--color-line);
  border-radius: 1.2rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
  break-inside: avoid;
}

.glossary-entry h2 {
  margin: 0;
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.45;
}

.glossary-entry h2 small {
  display: inline-block;
  margin-left: 0.45rem;
  color: var(--color-accent-text);
  font-family: var(--font-body);
  font-size: 0.82em;
  font-weight: 600;
}

.glossary-entry > p {
  margin: 0.55rem 0 0;
}

.glossary-entry dl {
  display: grid;
  grid-template-columns: minmax(9rem, 0.75fr) minmax(0, 1.75fr);
  gap: 0.7rem;
  margin: 0.9rem 0 0;
}

.glossary-entry dl > div {
  padding: 0.75rem;
  border-radius: 0.8rem;
  background: var(--color-soft);
}

.glossary-entry dt {
  color: var(--color-muted);
  font-size: 0.78rem;
}

.glossary-entry dd {
  margin: 0.2rem 0 0;
  line-height: 1.6;
}

.search-dialog {
  width: min(calc(100% - 2rem), 42rem);
  max-height: min(48rem, calc(100vh - 2rem));
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: 1.5rem;
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: var(--shadow-raised);
}

.search-dialog::backdrop {
  background: rgba(11, 20, 34, 0.62);
  backdrop-filter: blur(6px);
}

.search-dialog:not([open]) {
  display: none;
}

.search-panel {
  display: flex;
  max-height: min(48rem, calc(100vh - 2rem));
  flex-direction: column;
  padding: 1.1rem;
}

.search-panel header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
}

.search-panel h2 {
  margin: 0;
  color: var(--color-primary-strong);
  font-family: var(--font-display);
  font-size: 1.55rem;
}

.search-field {
  display: block;
  margin-top: 1rem;
}

.search-status {
  margin: 0.7rem 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.search-results {
  padding: 0;
  margin: 0;
  overflow-y: auto;
  list-style: none;
}

.search-results li + li {
  margin-top: 0.65rem;
}

.search-result {
  display: block;
  min-height: 44px;
  padding: 0.9rem 1rem;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  color: var(--color-ink);
  text-decoration: none;
}

.search-result:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.search-result strong,
.search-result small,
.search-result span {
  display: block;
}

.search-result strong {
  color: var(--color-primary-strong);
  font-family: var(--font-display);
}

.search-result small,
.search-result span {
  color: var(--color-muted);
}

.search-result span {
  margin-top: 0.25rem;
  font-size: 0.9rem;
  line-height: 1.55;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  width: min(100% - 2rem, var(--wide-width));
  padding: 2rem 0 3rem;
  margin: 0 auto;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
}

.site-footer strong {
  color: var(--color-primary-strong);
  font-family: var(--font-display);
}

.site-footer p {
  max-width: 36rem;
  margin: 0.4rem 0 0;
}

.site-footer nav {
  display: flex;
  flex: 0 0 auto;
  gap: 1rem;
}

.site-footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

@media (min-width: 84rem) {
  .content-layout:has(.toc-card) {
    position: relative;
  }

  .toc-card {
    position: absolute;
    top: 0;
    right: calc(100% + 2rem);
    width: 15rem;
    max-height: calc(100vh - var(--header-height) - 2rem);
    overflow-y: auto;
  }
}

@media (max-width: 52rem) {
  .header-inner {
    grid-template-columns: auto 1fr auto;
    gap: 0.5rem;
  }

  .menu-button {
    display: inline-grid;
    justify-self: end;
  }

  .primary-navigation {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 1rem;
    right: 1rem;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 0.65rem;
    border: 1px solid var(--color-line);
    border-radius: 1.2rem;
    background: var(--color-surface);
    box-shadow: var(--shadow-raised);
  }

  .primary-navigation[data-open="true"] {
    display: flex;
  }

  .primary-navigation a {
    justify-content: center;
  }

  .header-actions {
    grid-column: 3;
  }

  .tmux-house-window {
    grid-template-columns: 1fr;
  }

  .view-line {
    width: 2px;
    height: 2rem;
    margin: 0 auto;
  }

  .view-line::after {
    top: auto;
    right: -4px;
    bottom: -1px;
    border-width: 8px 5px 0;
    border-color: var(--color-accent) transparent transparent;
  }
}

@media (max-width: 40rem) {
  :root {
    --header-height: 4.15rem;
  }

  .header-inner,
  .page-container,
  .site-footer {
    width: min(100% - 2rem, var(--reading-width));
  }

  .brand small {
    display: none;
  }

  .page-container {
    padding-top: 1.25rem;
  }

  .page-hero {
    padding: 1.5rem;
    border-radius: 1.5rem;
  }

  .page-hero h1 {
    font-size: 2rem;
  }

  .route-visual-heading {
    display: block;
  }

  .route-visual-heading .eyebrow {
    margin-bottom: 0.5rem;
  }

  .route-visual--comparison .route-visual-list,
  .outcome-grid,
  .persona-grid,
  .part-grid,
  .resource-grid,
  .content-index-list,
  .observe-command-comparison,
  .page-pager,
  .stat-strip {
    grid-template-columns: 1fr;
  }

  .house-rooms {
    grid-template-columns: 1fr;
  }

  .house-room,
  .house-room:nth-child(2n),
  .house-room:nth-last-child(-n + 2) {
    min-height: 5.5rem;
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
  }

  .house-room:last-child {
    border-bottom: 0;
  }

  .prose {
    font-size: 1.08rem;
  }

  .prose > p:first-of-type {
    font-size: 1.15rem;
  }

  .pager-next {
    text-align: left;
  }

  .glossary-entry dl {
    grid-template-columns: 1fr;
  }

  .site-footer {
    display: block;
  }

  .site-footer nav {
    margin-top: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  @page {
    margin: 18mm 16mm;
  }

  :root,
  html[data-theme="dark"] {
    --color-paper: #FFFFFF;
    --color-surface: #FFFFFF;
    --color-ink: #111827;
    --color-muted: #4B5563;
    --color-primary: #1E3A5F;
    --color-primary-strong: #14283F;
    --color-accent: #8C6A2C;
    --color-accent-text: #76572C;
    --color-accent-soft: #F5EEDD;
    --color-line: #D8D3C7;
  }

  body {
    background: #fff;
    font-size: 11pt;
  }

  .site-header,
  .reading-progress,
  .skip-link,
  .search-dialog,
  .copy-button,
  .site-footer,
  .page-pager,
  .glossary-tools {
    display: none !important;
  }

  .page-container {
    width: 100%;
    padding: 0;
  }

  .page-hero,
  .editorial-illustration,
  .route-visual,
  .toc-card,
  .related-card,
  .tmux-explainer,
  blockquote,
  table,
  pre,
  figure {
    break-inside: avoid;
    box-shadow: none !important;
  }

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