@font-face {
  font-family: Instrument;
  src: url('assets/instrument-sans.woff2') format('woff2');
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
}
:root {
  --ink: #171927;
  --muted: #626777;
  --accent: #6240df;
  --line: #e5e5ed;
  --soft: #f6f4fc;
  font-family: Instrument, Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--accent); text-underline-offset: 4px; }
button, input, summary { font: inherit; }
button, summary { cursor: pointer; }
button, a, input, summary { -webkit-tap-highlight-color: transparent; }
a, button, input, summary { outline-offset: 4px; }
:focus-visible { outline: 2px solid var(--accent); }
::selection { background: #e6dfff; color: #20124b; }
input { caret-color: var(--accent); }
svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.6; flex: none; }
code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .86em; overflow-wrap: anywhere; }
pre { margin: 16px 0 24px; padding: 18px; border-radius: 6px; background: var(--soft); line-height: 1.8; overflow: auto; }
pre code { overflow-wrap: normal; }
p { margin: 0 0 20px; }
.topbar { position: sticky; top: 0; z-index: 20; height: 74px; display: flex; align-items: center; gap: 40px; padding: 0 40px; background: #fff; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; font-size: 28px; font-weight: 650; letter-spacing: -.03em; }
.brand-mark { display: inline-flex; gap: 5px; width: 27px; height: 25px; flex: none; }
.brand-mark i { width: 10px; height: 25px; background: var(--accent); border-radius: 3px; }
.brand-mark i:last-child { background: #9278eb; }
.topbar nav { display: flex; gap: 28px; margin-left: 20px; }
.topbar nav a { font-size: 14px; color: var(--muted); text-decoration: none; }
.topbar nav a:hover { color: var(--accent); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; border-radius: 6px; text-decoration: none; padding: 13px 17px; font-size: 14px; line-height: 1.3; font-weight: 500; min-height: 44px; }
.primary { background: var(--accent); color: #fff; }
.primary:hover { background: #5030c4; }
.topbar .button { margin-left: auto; }
.layout { display: grid; grid-template-columns: 210px minmax(0, 1fr); max-width: 1550px; margin: 0 auto; }
.chapter-rail { position: sticky; top: 74px; height: calc(100dvh - 74px); padding: 32px 18px 24px 28px; border-right: 1px solid var(--line); display: flex; flex-direction: column; overflow-y: auto; }
.chapter-rail nav { display: flex; flex-direction: column; gap: 1px; }
.chapter-rail nav a { color: var(--muted); text-decoration: none; font-size: 13px; line-height: 1.5; padding: 8px 10px; border-radius: 4px; }
.chapter-rail nav a:hover { color: var(--ink); background: #f8f8fb; }
.chapter-rail nav a[aria-current] { color: var(--accent); background: var(--soft); }
.rail-foot { font-size: 11px; line-height: 1.8; color: var(--muted); padding: 28px 10px 0; margin-top: auto; }
main { min-width: 0; padding: 0 52px; }
.hero { padding: 68px 0 56px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 34px; align-items: center; }
.hero h1 { font-size: 58px; letter-spacing: -.035em; line-height: 1.08; font-weight: 600; margin: 0 0 24px; }
.lede { font-size: 18px; line-height: 1.7; color: #555d6e; max-width: 48ch; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; margin: 28px 0 20px; }
.text-link { font-size: 14px; }
.hero-note { font-size: 13px; line-height: 1.7; max-width: 48ch; color: var(--muted); margin: 0; }
.preview { margin: 0; min-width: 0; }
.preview img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 6px; }
.preview figcaption { font-size: 11px; color: var(--muted); line-height: 1.7; margin-top: 10px; }
.guide-section { padding: 52px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: minmax(170px, .6fr) minmax(0, 1.4fr); gap: 40px; scroll-margin-top: 88px; }
.section-intro h2 { font-size: 31px; font-weight: 600; letter-spacing: -.025em; line-height: 1.2; margin: 0 0 16px; text-wrap: balance; }
.section-intro > p { font-size: 14px; line-height: 1.75; color: var(--muted); max-width: 28ch; }
.section-body { min-width: 0; }
.section-body > p, .section-body li, .section-body dd, .full-section > p { font-size: 15px; line-height: 1.8; color: #464e60; max-width: 72ch; }
.section-body strong { font-weight: 600; color: var(--ink); }
.full-section { display: block; }
.full-section > .section-intro > p { font-size: 16px; line-height: 1.8; max-width: 70ch; }
.places { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 30px; margin: 32px 0; }
.places h3 { font-size: 16px; line-height: 1.5; font-weight: 600; margin: 0 0 8px; }
.places p { font-size: 14px; line-height: 1.8; color: #555d6e; margin: 0; max-width: 38ch; }
.path-explainer { margin: 36px 0 28px; }
.mode-tabs { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 20px; }
.mode-tabs button { min-height: 44px; padding: 10px 14px; font-size: 13px; border: 1px solid transparent; border-radius: 5px; color: #555d6e; background: transparent; }
.mode-tabs button:hover { background: #f8f7fc; color: var(--ink); }
.mode-tabs button[aria-selected="true"] { background: var(--soft); border-color: #d5cbed; color: #4f2ac2; font-weight: 500; }
.network-path { display: flex; list-style: none; padding: 24px 0; margin: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); gap: 22px; }
.network-path li { flex: 1; position: relative; min-width: 0; padding-right: 4px; }
.network-path li:not(:last-child)::after { content: '→'; position: absolute; top: 0; right: -15px; color: var(--accent); }
.network-path.read-path li:not(:last-child)::after { content: '↔'; }
.network-path strong { display: block; font-weight: 600; font-size: 14px; line-height: 1.5; }
.network-path span { display: block; color: var(--muted); font-size: 12px; line-height: 1.7; margin-top: 8px; }
.path-caption { font-size: 14px; line-height: 1.8; color: #555d6e; max-width: 74ch; margin: 18px 0 0; }
.note { padding: 16px 18px; background: var(--soft); border-radius: 6px; font-size: 13px; line-height: 1.8; color: #46405b; }
.full-section > p.note, .section-body > p.note { font-size: 13px; line-height: 1.8; max-width: none; color: #46405b; }
.walkthrough, .plain-list { margin: 0 0 24px; padding-left: 20px; }
.walkthrough li, .plain-list li { padding-left: 5px; margin-bottom: 18px; }
.section-body details { padding: 18px 0; border-top: 1px solid var(--line); }
.section-body details:last-of-type { border-bottom: 1px solid var(--line); margin-bottom: 24px; }
summary { font-size: 14px; line-height: 1.65; font-weight: 500; color: var(--ink); }
details p { font-size: 14px; line-height: 1.8; color: #555d6e; margin: 16px 0 0; }
details[open] summary { color: var(--accent); }
.workbench { padding: 22px; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 28px; }
label { display: block; font-size: 13px; font-weight: 500; line-height: 1.7; margin: 8px 0; }
input { width: 100%; min-width: 0; border: 1px solid #cbd0dd; border-radius: 5px; padding: 11px 12px; color: var(--ink); background: #fff; font-size: 14px; }
input::placeholder { color: #687083; }
.field-help { font-size: 12px; line-height: 1.8; color: var(--muted); margin: 9px 0 16px; }
.field-help.error { color: #a12643; }
.command-steps { counter-reset: step; list-style: none; padding: 0; margin: 24px 0 0; }
.command-steps li { counter-increment: step; display: flex; gap: 12px; margin: 0 0 24px; min-width: 0; }
.command-steps li::before { content: counter(step); flex: none; width: 25px; height: 25px; border-radius: 50%; display: grid; place-items: center; background: var(--soft); color: var(--accent); font-size: 12px; font-weight: 600; }
.command-steps li > div { flex: 1; min-width: 0; }
.command-steps h3 { font-size: 15px; line-height: 1.5; font-weight: 600; margin: 1px 0 10px; }
.code-line { display: flex; align-items: flex-start; gap: 8px; border-radius: 5px; padding: 12px; background: var(--soft); min-width: 0; }
.code-line code { flex: 1; min-width: 0; white-space: pre-wrap; word-break: break-word; font-size: 12px; line-height: 1.9; color: #35324a; }
.copy-button { display: inline-flex; align-items: center; justify-content: center; flex: none; border: 0; border-radius: 4px; padding: 5px 6px; min-height: 30px; font-size: 12px; background: transparent; color: #524077; }
.copy-button:hover { background: #e7e0f8; }
.copy-button:disabled { opacity: .6; cursor: default; }
.step-help { font-size: 12px; line-height: 1.8; color: var(--muted); margin: 10px 0 0; }
.copy-block { position: relative; }
.copy-block pre { padding-right: 65px; }
.copy-block .copy-button { position: absolute; top: 12px; right: 8px; }
.restore-stages { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); list-style: none; counter-reset: restore; padding: 0; margin: 0 0 28px; gap: 20px; }
.restore-stages li { counter-increment: restore; font-size: 13px; margin: 0; }
.restore-stages li::before { content: counter(restore) '.'; color: var(--muted); display: block; margin-bottom: 6px; }
.restore-stages strong { display: block; }
.restore-stages span { display: block; color: var(--muted); margin-top: 6px; font-size: 13px; line-height: 1.7; }
table { width: 100%; border-collapse: collapse; font-size: 13px; line-height: 1.8; margin: 24px 0; table-layout: fixed; }
caption { text-align: left; color: var(--ink); font-size: 14px; font-weight: 500; margin-bottom: 12px; }
th, td { text-align: left; vertical-align: top; padding: 13px 10px; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
th { color: var(--muted); font-size: 12px; font-weight: 500; }
th:first-child, td:first-child { width: 38%; padding-left: 0; }
.glossary { margin: 0 0 24px; }
.glossary > div { border-top: 1px solid var(--line); padding: 18px 0; }
.glossary > div:first-child { padding-top: 0; border-top: 0; }
dt { font-size: 15px; font-weight: 600; line-height: 1.7; margin-bottom: 5px; }
dd { margin: 0; }
blockquote { margin: 28px 0; padding: 22px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
blockquote p { font-size: 20px; line-height: 1.65; letter-spacing: -.015em; margin: 0 0 14px; }
blockquote cite { font-size: 12px; font-style: normal; color: var(--muted); }
.hash { display: block; overflow-wrap: anywhere; margin-top: 8px; }
footer { border-top: 1px solid var(--line); padding: 38px 0; }
footer .brand { font-size: 23px; }
footer > p { color: var(--muted); font-size: 14px; margin: 16px 0; }
footer > div { display: flex; flex-wrap: wrap; gap: 22px; margin: 24px 0; }
footer > div a { font-size: 13px; }
footer small { display: block; font-size: 11px; line-height: 1.8; color: var(--muted); max-width: 90ch; }
.mobile-chapters { display: none; }
.skip-link { position: fixed; top: -70px; left: 20px; padding: 12px; z-index: 40; background: #fff; }
.skip-link:focus { top: 10px; }
.clipboard-status { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 30; background: #272039; color: #fff; border-radius: 6px; padding: 12px 16px; font-size: 13px; line-height: 1.6; max-width: calc(100vw - 24px); opacity: 0; pointer-events: none; }
.clipboard-status.visible { opacity: 1; transition: opacity .15s ease-out; }
[hidden] { display: none !important; }
@media (max-width: 1200px) {
  .topbar { padding: 0 28px; gap: 28px; }
  .topbar nav { margin-left: 0; gap: 20px; }
  .layout { grid-template-columns: 185px minmax(0, 1fr); }
  .chapter-rail { padding-left: 17px; padding-right: 12px; }
  main { padding: 0 32px; }
  .hero { grid-template-columns: 1fr; gap: 26px; padding: 44px 0; }
  .hero h1 { font-size: 52px; }
  .hero h1 br { display: none; }
  .hero-copy { max-width: 70ch; }
  .lede { max-width: 65ch; }
  .preview { max-width: 640px; }
  .guide-section { grid-template-columns: minmax(150px, .6fr) minmax(0, 1.4fr); gap: 26px; }
  .full-section { display: block; }
  .section-intro h2 { font-size: 28px; }
  .workbench { padding: 18px; }
  .network-path { gap: 18px; }
  .network-path li:not(:last-child)::after { right: -12px; }
}
@media (max-width: 760px) {
  :root { scroll-padding-top: 84px; }
  .topbar { height: 66px; padding: 0 20px; gap: 16px; }
  .topbar nav { display: none; }
  .topbar .brand { font-size: 25px; }
  .topbar .button { font-size: 12px; padding: 10px 12px; gap: 8px; }
  .layout { display: block; }
  .chapter-rail { display: none; }
  main { padding: 0 22px; }
  .mobile-chapters { display: block; padding: 16px 0; border-bottom: 1px solid var(--line); }
  .mobile-chapters summary { font-size: 13px; color: var(--muted); }
  .mobile-chapters nav { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding: 24px 0 10px; font-size: 13px; }
  .mobile-chapters a { text-decoration: none; }
  .hero { padding: 36px 0; gap: 28px; }
  .hero h1 { font-size: 42px; line-height: 1.13; max-width: 12ch; }
  .lede { font-size: 17px; }
  .hero-actions { gap: 18px; }
  .hero-note { max-width: 50ch; }
  .guide-section { display: block; padding: 36px 0; scroll-margin-top: 82px; }
  .section-intro { margin-bottom: 24px; }
  .section-intro h2 { font-size: 29px; max-width: 22ch; }
  .section-intro > p { max-width: 60ch; font-size: 14px; }
  .places { grid-template-columns: 1fr; gap: 24px; margin: 28px 0; }
  .places p { max-width: 65ch; }
  .path-explainer { margin-top: 28px; }
  .network-path { flex-direction: column; padding: 20px 0; gap: 28px; }
  .network-path li { display: grid; grid-template-columns: 1fr 1.2fr; gap: 16px; padding: 0; }
  .network-path span { margin-top: 0; }
  .network-path li:not(:last-child)::after { content: '↓'; top: auto; bottom: -24px; left: 0; right: auto; }
  .network-path.read-path li:not(:last-child)::after { content: '↕'; }
  .network-path strong { font-size: 14px; }
  .path-caption { font-size: 14px; }
  .workbench { padding: 16px 14px; }
  .mode-tabs { gap: 3px; }
  .mode-tabs button { padding: 10px 11px; font-size: 12px; }
  input { font-size: 16px; }
  .command-steps li { gap: 9px; }
  .command-steps li::before { width: 22px; height: 22px; }
  .command-steps h3 { font-size: 14px; }
  .code-line { padding: 10px 8px; gap: 5px; }
  .code-line code { font-size: 11px; }
  .copy-button { min-height: 36px; padding: 4px; }
  .restore-stages { gap: 14px; }
  .restore-stages strong, .restore-stages span { font-size: 12px; }
  pre { padding: 14px; font-size: 12px; }
  th, td { padding: 12px 8px; }
  blockquote p { font-size: 18px; }
  footer { padding: 30px 0; }
}
@media (max-width: 360px) {
  main { padding: 0 16px; }
  .topbar { padding: 0 16px; }
  .topbar .button { gap: 5px; padding: 10px; font-size: 11px; }
  .hero h1 { font-size: 38px; }
  .workbench { padding: 14px 10px; }
  .command-steps li { gap: 6px; }
}
@media (pointer: coarse) {
  .copy-button { min-height: 44px; min-width: 44px; }
  .mobile-chapters a { min-height: 38px; display: flex; align-items: center; }
}
@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}