:root {
  --guide-max: 1180px;
  --guide-reading: 760px;
}

html { scroll-behavior: smooth; overflow-x: hidden; }
body { margin: 0; overflow-x: hidden; background: var(--sv-paper); color: var(--sv-pitch); font-family: var(--sv-font-body); line-height: 1.58; }
* { box-sizing: border-box; }
h1, h2, h3, p, pre, figure { margin: 0; }
h1, h2, h3 { font-family: var(--sv-font-display); letter-spacing: -0.035em; }
a { color: inherit; }
code, pre { font-family: var(--sv-font-mono); }
code { padding: .08em .28em; border-radius: 5px; background: var(--sv-paper-band); color: var(--sv-pitch); font-size: .92em; }
.container { width: min(var(--guide-max), calc(100% - 112px)); margin: 0 auto; }
.sv-skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 10px 14px; background: var(--sv-pitch); color: var(--sv-paper); transform: translateY(-160%); }
.sv-skip-link:focus { transform: translateY(0); }

.nav { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--sv-paper) 94%, transparent); border-bottom: 1px solid var(--sv-ash); backdrop-filter: blur(14px); }
.nav-row { min-height: 88px; max-width: 1320px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 0 40px; }
.nav-brand, .nav-links, .nav-actions, .nav-mark-group { display: flex; align-items: center; }
.nav-brand { gap: 36px; }
.nav-links { gap: 26px; }
.nav-actions { gap: 18px; }
.nav-mark-group { gap: 10px; text-decoration: none; }
.nav-mark { width: 22px; height: 22px; }
.nav-wordmark { display: inline-flex; font-family: var(--sv-font-display); font-size: 22px; font-weight: 500; line-height: 1; letter-spacing: -.04em; }
.nav-wordmark-dot { color: var(--sv-volt); }
.nav-link, .nav-login { font-size: var(--sv-text-body); font-weight: 600; text-decoration: none; }
.nav-link:hover, .nav-login:hover { text-decoration: underline; text-underline-offset: 4px; }
.nav-link[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--sv-volt); text-decoration-thickness: 2px; text-underline-offset: 6px; }
.btn { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 20px; border: 1px solid transparent; border-radius: var(--sv-radius-sm); font-weight: 700; text-decoration: none; transition: transform var(--sv-dur-tap) var(--sv-ease); }
.btn:hover { transform: translateY(-2px); }
.btn:focus-visible, a:focus-visible, summary:focus-visible, .table-wrap:focus-visible { outline: 3px solid var(--sv-volt); outline-offset: 3px; }
.btn-primary { background: var(--sv-volt); color: var(--sv-pitch); }
.btn-dark { background: var(--sv-pitch); color: var(--sv-paper); }
.btn-ghost { background: transparent; border-color: var(--sv-pitch); }
.btn-on-dark { color: var(--sv-paper); border-color: var(--sv-paper-40); }

.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 22px; color: var(--sv-stone); font-family: var(--sv-font-mono); font-size: var(--sv-text-micro); letter-spacing: .07em; text-transform: uppercase; }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--sv-pitch); }

.article-hero { padding: 58px 0 82px; border-bottom: 1px solid var(--sv-paper-edge); }
.article-hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, .72fr); gap: 70px; align-items: center; }
.eyebrow, .section-label, .visual-kicker, .toc-title { color: var(--sv-stone); font-family: var(--sv-font-mono); font-size: var(--sv-text-micro); font-weight: 600; letter-spacing: .12em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
.eyebrow::before { width: 28px; height: 3px; content: ""; background: var(--sv-volt); }
h1 { max-width: 800px; font-size: clamp(46px, 5.5vw, 72px); font-weight: 800; line-height: .98; }
.hero-answer { max-width: 740px; margin-top: 24px; color: var(--sv-stone); font-size: var(--sv-text-body-lg); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 20px; color: var(--sv-stone); font-family: var(--sv-font-mono); font-size: var(--sv-text-micro); letter-spacing: .06em; text-transform: uppercase; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.hero-visual { min-height: 420px; position: relative; padding: 26px; overflow: hidden; background: var(--sv-pitch); color: var(--sv-paper); border: 1px solid var(--sv-pitch); box-shadow: 14px 14px 0 var(--sv-volt); }
.visual-kicker { color: var(--sv-paper-70); }
.visual-note { margin-top: 22px; color: var(--sv-paper-70); }
.connection-stack { display: grid; gap: 11px; margin-top: 28px; }
.connection-node { display: grid; grid-template-columns: 46px minmax(0, 1fr) auto; gap: 14px; align-items: center; min-height: 76px; padding: 13px 14px; border: 1px solid var(--sv-paper-10); background: color-mix(in srgb, var(--sv-paper) 8%, transparent); }
.connection-icon { width: 42px; height: 42px; display: grid; place-items: center; background: var(--sv-paper); color: var(--sv-pitch); font-family: var(--sv-font-display); font-size: var(--sv-text-h3); font-weight: 800; }
.connection-node strong { display: block; font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.connection-node small { display: block; color: var(--sv-paper-70); }
.connection-arrow { color: var(--sv-volt); font-size: var(--sv-text-h2); font-weight: 800; }
.packet { margin-top: 28px; padding: 20px; background: var(--sv-paper); color: var(--sv-pitch); transform: rotate(-1deg); }
.packet-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--sv-paper-edge); }
.packet-head strong { font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.packet-status { color: var(--sv-stone); font-family: var(--sv-font-mono); font-size: var(--sv-text-micro); text-transform: uppercase; }
.packet pre { margin-top: 16px; font-size: var(--sv-text-link); line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere; }
.packet-route { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 20px; }
.packet-route span { padding: 10px 8px; border-top: 3px solid var(--sv-volt); color: var(--sv-paper-70); font-size: var(--sv-text-link); text-align: center; }
.playbook-board { display: grid; gap: 14px; margin-top: 28px; }
.playbook-step { display: grid; grid-template-columns: 52px 1fr; gap: 14px; align-items: start; }
.playbook-number { width: 52px; height: 52px; display: grid; place-items: center; border: 1px solid var(--sv-paper-40); color: var(--sv-volt); font-family: var(--sv-font-mono); }
.playbook-step strong { display: block; font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.playbook-step p { margin-top: 2px; color: var(--sv-paper-70); }
.postcard-chip { margin-top: 24px; padding: 18px; background: var(--sv-paper); color: var(--sv-pitch); transform: rotate(1.5deg); }
.postcard-chip span { display: block; color: var(--sv-stone); font-family: var(--sv-font-hand); font-size: var(--sv-text-h2); }

.availability { border-block: 1px solid var(--sv-paper-edge); background: var(--sv-paper-band); }
.availability-inner { display: grid; grid-template-columns: auto 1fr; gap: 20px; align-items: start; padding: 24px 0; }
.availability-label { padding: 5px 8px; background: var(--sv-pitch); color: var(--sv-paper); font-family: var(--sv-font-mono); font-size: var(--sv-text-micro); letter-spacing: .08em; text-transform: uppercase; }
.availability p { color: var(--sv-stone); }
.availability strong { color: var(--sv-pitch); }

.article-layout { display: grid; grid-template-columns: 240px minmax(0, var(--guide-reading)); gap: 78px; align-items: start; justify-content: center; padding: 76px 0 96px; }
.toc { position: sticky; top: 116px; }
.toc-title { margin-bottom: 14px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--sv-paper-edge); }
.toc a { display: block; padding: 11px 0; color: var(--sv-stone); font-size: var(--sv-text-link); text-decoration: none; border-bottom: 1px solid var(--sv-paper-edge); }
.toc a:hover, .toc a:focus { color: var(--sv-pitch); text-decoration: underline; text-decoration-color: var(--sv-volt); text-underline-offset: 4px; }
.article-body { min-width: 0; }
.article-section { padding: 0 0 62px; scroll-margin-top: 112px; }
.article-section + .article-section { padding-top: 62px; border-top: 1px solid var(--sv-paper-edge); }
.section-label { margin-bottom: 12px; }
.article-section h2 { max-width: 720px; font-size: clamp(34px, 4vw, 48px); font-weight: 800; line-height: 1.02; }
.article-section h3 { margin-top: 34px; font-size: var(--sv-text-h2); line-height: 1.1; }
.article-section p { margin-top: 18px; color: var(--sv-stone); font-size: var(--sv-text-body-lg); }
.article-section a { text-decoration-color: var(--sv-volt); text-underline-offset: 3px; }
.direct-answer { margin-top: 24px; padding: 22px 24px; background: var(--sv-paper-card); border-left: 5px solid var(--sv-volt); }
.direct-answer strong { display: block; font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.direct-answer p { margin-top: 8px; font-size: var(--sv-text-body); }
.step-list { list-style: none; margin: 28px 0 0; padding: 0; counter-reset: guide-step; border-top: 1px solid var(--sv-pitch); }
.step-list li { counter-increment: guide-step; display: grid; grid-template-columns: 190px 1fr; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--sv-paper-edge); }
.step-list li::before { content: "0" counter(guide-step); color: var(--sv-volt); font-family: var(--sv-font-mono); font-weight: 700; grid-column: 1; }
.step-list strong { grid-column: 1; font-family: var(--sv-font-display); font-size: var(--sv-text-body-lg); }
.step-list span { grid-column: 2; grid-row: 1 / span 2; color: var(--sv-stone); }
.table-wrap { max-width: 100%; margin-top: 26px; overflow-x: auto; border: 1px solid var(--sv-paper-edge); background: var(--sv-bg-elevated); }
table { width: 100%; min-width: 680px; border-collapse: collapse; }
th, td { padding: 16px 18px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--sv-paper-edge); }
th { background: var(--sv-paper-band); color: var(--sv-stone); font-family: var(--sv-font-mono); font-size: var(--sv-text-micro); letter-spacing: .08em; text-transform: uppercase; }
td { color: var(--sv-stone); }
tr:last-child td { border-bottom: 0; }
.checklist { margin-top: 34px; padding: 26px; background: var(--sv-pitch); color: var(--sv-paper); }
.checklist h3 { margin: 0; }
.checklist ul { list-style: none; margin: 18px 0 0; padding: 0; }
.checklist li { display: grid; grid-template-columns: 24px 1fr; gap: 10px; padding: 11px 0; color: var(--sv-paper-70); border-bottom: 1px solid var(--sv-paper-10); }
.checklist li:last-child { border-bottom: 0; }
.checklist li span { color: var(--sv-volt); font-family: var(--sv-font-mono); }
.faq details { margin-top: 14px; border: 1px solid var(--sv-paper-edge); background: var(--sv-bg-elevated); }
.faq summary { cursor: pointer; padding: 18px 20px; font-weight: 700; }
.faq details p { margin: 0; padding: 0 20px 20px; font-size: var(--sv-text-body); }
.sources ol { margin: 22px 0 0; padding-left: 24px; }
.sources li { margin-top: 14px; color: var(--sv-stone); }
.sources li a { display: block; color: var(--sv-pitch); font-weight: 700; }
.sources li span { display: block; margin-top: 3px; }
.source-note { padding: 18px; background: var(--sv-paper-band); border-left: 4px solid var(--sv-volt); font-size: var(--sv-text-body) !important; }

.guide-cta { padding: 68px 0; background: var(--sv-pitch); color: var(--sv-paper); }
.guide-cta-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 56px; align-items: end; }
.guide-cta h2 { max-width: 760px; font-size: clamp(36px, 4.5vw, 58px); line-height: 1; }
.guide-cta p:not(.section-label) { max-width: 720px; margin-top: 16px; color: var(--sv-paper-70); }
.guide-cta .section-label { color: var(--sv-volt); }
.guide-cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.footer { background: var(--sv-pitch); color: var(--sv-paper-70); border-top: 1px solid var(--sv-paper-10); }
.footer-row { min-height: 90px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--sv-paper); }

@media (max-width: 980px) {
  .container { width: min(100% - 48px, var(--guide-max)); }
  .nav-links, .nav-login, .nav-start { display: none; }
  .article-hero-grid { grid-template-columns: 1fr; }
  .hero-visual { width: min(100%, 620px); }
  .article-layout { grid-template-columns: 1fr; gap: 44px; }
  .toc { position: static; }
  .toc ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .toc a { padding-right: 16px; }
}

@media (max-width: 640px) {
  .container { width: min(100% - 32px, var(--guide-max)); }
  .nav-row { min-height: 72px; padding: 0 16px; }
  .article-hero { padding: 38px 0 56px; }
  h1 { font-size: clamp(40px, 12vw, 56px); }
  .hero-answer { font-size: var(--sv-text-body); }
  .hero-visual { min-height: 0; padding: 18px; box-shadow: 8px 8px 0 var(--sv-volt); }
  .connection-node { grid-template-columns: 40px minmax(0, 1fr); }
  .connection-arrow { display: none; }
  .packet { padding: 14px; }
  .packet pre { font-size: 11px; }
  .packet-route { grid-template-columns: 1fr; }
  .availability-inner { grid-template-columns: 1fr; gap: 12px; }
  .availability-label { width: fit-content; }
  .article-layout { padding: 52px 0 68px; }
  .toc ol { grid-template-columns: 1fr; }
  .article-section { padding-bottom: 48px; }
  .article-section + .article-section { padding-top: 48px; }
  .article-section h2 { font-size: 34px; }
  .article-section p { font-size: var(--sv-text-body); }
  .step-list li { grid-template-columns: 1fr; gap: 7px; }
  .step-list li::before, .step-list strong, .step-list span { grid-column: 1; grid-row: auto; }
  .guide-cta-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-row { align-items: flex-start; flex-direction: column; padding-block: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}