.guide-invitation { padding-block: 55px; border-bottom: 1px solid var(--line); }
.guide-invitation-head { display: flex; justify-content: space-between; align-items: center; gap: 35px; }
.guide-invitation-head h2 { font-size: 34px; letter-spacing: -.04em; margin-bottom: 16px; }
.guide-invitation-head p:not(.eyebrow) { max-width: 680px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.guide-invitation-head .eyebrow { margin-bottom: 14px; }
.guide-invitation-head .button { flex-shrink: 0; }
.guide-invitation-links { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); border-top: 1px solid var(--line); margin-top: 30px; }
.guide-invitation-links a { display: flex; gap: 12px; padding: 20px 16px 0 0; align-items: center; font-size: 12px; }
.guide-invitation-links a > span:first-child { font: 10px var(--mono); color: var(--sea); }
.guide-invitation-links a > span:last-child { margin-left: auto; }
.guide-invitation-links a:hover { text-decoration: underline; text-underline-offset: 4px; }
.guide-page .header { min-height: 90px; }
.guide-mobile-bar { display: none; }
.catalog-opening,.article-opening { background: var(--night); color: var(--paper); }
.catalog-hero { display: grid; grid-template-columns: 1.65fr 1fr; align-items: center; gap: 65px; padding-block: 80px 100px; }
.catalog-hero .eyebrow { color: var(--signal); }
.catalog-hero h1 { font-size: clamp(42px,5vw,72px); letter-spacing: -.055em; line-height: 1.15; font-weight: 550; }
.catalog-hero > div > p:not(.eyebrow) { margin-top: 29px; color: #b5ccd1; max-width: 710px; font-size: 16px; line-height: 1.95; }
.catalog-hero .button { margin-top: 30px; background: var(--signal); color: var(--night); }
.catalog-emblem { border: 1px solid #587a8060; background: linear-gradient(90deg,transparent 49.8%,#81a8ad13 50%,transparent 50.2%),linear-gradient(transparent 49.8%,#81a8ad13 50%,transparent 50.2%); position: relative; padding: 50px 35px 35px; }
.catalog-emblem img { width: 100%; height: auto; display: block; padding-block: 20px; }
.catalog-emblem > span { display: block; font: 8px/1.6 var(--mono); color: #84a4ac; letter-spacing: .08em; text-align: center; margin-top: 18px; }
.catalog-emblem .emblem-coordinate { position: absolute; top: 0; left: 20px; }
.catalog-body { padding-block: 45px 95px; }
.guide-search { display: grid; grid-template-columns: 150px minmax(0,1fr) 90px; gap: 25px; align-items: center; padding: 25px 0 35px; border-bottom: 1px solid var(--line); }
.guide-search > label { font-size: 15px; font-weight: 550; }
.guide-search > div { display: flex; border: 1px solid #82998c; background: var(--white); }
.guide-search input { width: 100%; min-width: 0; padding: 15px 18px; border: 0; background: transparent; font: 14px var(--sans); color: var(--ink); }
.guide-search button { flex-shrink: 0; padding: 12px 18px; border: 0; border-left: 1px solid var(--line); background: var(--wash); font-size: 11px; }
.guide-search > p { font-size: 11px; color: var(--muted); text-align: right; }
.catalog-group { padding-top: 55px; }
.catalog-group-heading { display: flex; gap: 22px; align-items: start; margin-bottom: 23px; }
.catalog-group-heading > span { font: 11px var(--mono); color: var(--sea); padding-top: 8px; }
.catalog-group-heading h2 { font-size: 30px; line-height: 1.3; letter-spacing: -.04em; }
.catalog-group-heading p { margin-top: 13px; font-size: 13px; color: var(--muted); }
.guide-card-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 20px; }
.guide-card { min-width: 0; border: 1px solid #bdc9b8; background: var(--white); }
.guide-card a { display: flex; height: 100%; flex-direction: column; padding: 25px; transition: background .15s; }
.guide-card a:hover { background: #eaf0d8; }
.guide-card-index { display: flex; justify-content: space-between; font: 11px var(--mono); color: var(--sea); }
.guide-card-index span { font-size: 21px; line-height: 1; }
.guide-card h3 { font-size: 25px; letter-spacing: -.035em; line-height: 1.35; margin-block: 31px 17px; }
.guide-card p { font-size: 13px; line-height: 1.85; color: var(--muted); padding-bottom: 24px; }
.guide-card-bottom { font-size: 10px; color: #526750; border-top: 1px solid var(--line); padding-top: 14px; margin-top: auto; }
.search-empty { padding-block: 60px; color: var(--muted); }
.article-hero { padding-block: 27px 65px; }
.breadcrumbs { display: flex; align-items: center; gap: 13px; font-size: 10px; color: #9ab5bd; margin-bottom: 60px; }
.breadcrumbs a:hover { color: var(--signal); }
.article-title-grid { display: grid; grid-template-columns: 160px minmax(0,1fr); gap: 50px; align-items: start; }
.article-number { font-size: 130px; font-weight: 300; font-family: var(--mono); line-height: .95; letter-spacing: -.09em; color: #50717a; }
.article-title-grid .eyebrow { color: var(--signal); margin-bottom: 20px; }
.article-title-grid h1 { font-size: clamp(37px,4vw,60px); letter-spacing: -.05em; line-height: 1.22; max-width: 1000px; text-wrap: balance; }
.article-dek { max-width: 870px; color: #b8cdd1; font-size: 16px; line-height: 1.9; margin-top: 25px; }
.article-layout { display: grid; grid-template-columns: 230px minmax(0,850px); gap: 65px; padding-block: 70px 30px; justify-content: space-between; align-items: start; }
.article-toc { position: sticky; top: 30px; max-height: calc(100vh - 60px); overflow: auto; padding: 0 20px 10px 0; }
.article-toc > p { color: var(--sea); font-size: 11px; margin-bottom: 17px; }
.article-toc ol,.mobile-toc ol { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.article-toc li,.mobile-toc li { border-bottom: 1px solid var(--line); }
.article-toc li a,.mobile-toc li a { display: flex; align-items: start; gap: 12px; font-size: 11px; line-height: 1.8; padding: 13px 0; color: var(--muted); }
.article-toc li a:hover,.mobile-toc li a:hover { color: var(--ink); background: #e5e8dc70; }
.article-toc li span,.mobile-toc li span { color: #718270; font: 9px/2 var(--mono); min-width: 15px; }
.toc-catalog { display: block; margin-top: 23px; font-size: 11px; }
.mobile-toc { display: none; }
.guide-article { min-width: 0; }
.article-lead { font-size: 18px; line-height: 1.95; color: #294751; }
.article-lead p + p { margin-top: 22px; }
.article-takeaways { border-left: 3px solid #8aa45b; background: #e6ead8; padding: 27px 30px; margin-block: 36px; }
.article-takeaways h2 { font-size: 12px; color: #506447; margin-bottom: 18px; }
.article-takeaways ul { margin: 0; padding-left: 18px; }.article-takeaways li { font-size: 14px; line-height: 1.85; padding-left: 5px; }.article-takeaways li + li { margin-top: 9px; }
.guide-diagram { border: 1px solid #a8bba2; background: #e5e9dd; padding: 26px; margin-block: 40px 55px; }
.guide-diagram figcaption > span { display: block; color: #657d65; font: 8px/1.6 var(--mono); letter-spacing: .08em; }
.guide-diagram figcaption strong { display: block; font-size: 17px; line-height: 1.6; margin-top: 9px; font-weight: 550; }
.diagram-track { display: grid; grid-template-columns: repeat(calc(var(--node-count) * 2 - 1),minmax(0,1fr)); align-items: center; margin-block: 25px; }
.diagram-node { border: 1px solid #a3b698; background: var(--white); padding: 17px 12px; text-align: center; min-height: 100px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; }
.diagram-node strong { font-size: 11px; line-height: 1.6; font-weight: 550; overflow-wrap: anywhere; }
.diagram-step { font: 9px var(--mono); color: #6f8669; }
.diagram-pier { background: var(--signal); }.diagram-pier img { width: 56px; height: auto; }
.diagram-edge { font: 8px/1.6 var(--mono); color: #4a6b60; text-align: center; align-self: center; padding-inline: 3px; }
.diagram-edge i { position: relative; display: block; font-size: 17px; font-style: normal; line-height: 19px; text-align: right; }
.diagram-edge i::before { content: ''; position: absolute; left: 0; right: 9px; top: 50%; border-top: 1px solid currentColor; }
.guide-diagram > p { font-size: 11px; line-height: 1.8; color: #567062; }
.article-section { scroll-margin-top: 30px; padding-block: 13px 45px; }
.article-section + .article-section { border-top: 1px solid var(--line); padding-top: 38px; }
.article-section-heading { display: flex; align-items: baseline; gap: 18px; margin-bottom: 26px; }
.article-section-heading > span { color: var(--sea); font: 11px var(--mono); flex-shrink: 0; }
.article-section h2 { font-size: 31px; letter-spacing: -.04em; line-height: 1.4; }
.article-section p { font-size: 16px; line-height: 1.95; color: #38525a; }
.article-section p + p { margin-top: 20px; }
.article-list { margin: 23px 0; padding-left: 23px; }.article-list li { padding-left: 5px; font-size: 15px; line-height: 1.9; color: #38525a; }.article-list li + li { margin-top: 11px; }
.worked-example { background: var(--white); border: 1px solid #b5c4aa; border-left: 4px solid #839e60; margin-top: 30px; padding: 27px 29px; }
.example-kicker { color: var(--sea); font: 9px/1.6 var(--mono); letter-spacing: .06em; display: block; margin-bottom: 13px; }
.worked-example h3 { font-size: 21px; line-height: 1.45; letter-spacing: -.025em; margin-bottom: 15px; }.worked-example p { font-size: 14px; line-height: 1.95; }
.article-questions { margin-top: 15px; padding-top: 40px; border-top: 2px solid var(--ink); scroll-margin-top: 25px; }
.article-questions h2 { font-size: 29px; line-height: 1.4; margin-bottom: 23px; letter-spacing: -.04em; }
.article-questions details { border-bottom: 1px solid var(--line); }
.article-questions summary { padding-block: 23px; list-style: none; display: flex; justify-content: space-between; gap: 20px; font-size: 16px; line-height: 1.7; }
.article-questions summary::-webkit-details-marker { display: none; }.article-questions summary > span { font: 23px/1.3 var(--mono); }.article-questions details[open] summary > span { transform: rotate(45deg); }
.article-questions details > p { font-size: 15px; color: #38525a; line-height: 1.95; padding: 0 35px 26px 0; }
.article-closing { margin-block: 35px; font-size: 17px; line-height: 1.95; color: #294751; }
.article-references { padding: 22px; background: var(--wash); }.article-references h2 { font-size: 12px; margin-bottom: 15px; }.article-references a { display: inline-flex; font-size: 12px; gap: 10px; margin: 7px 22px 7px 0; text-decoration: underline; text-underline-offset: 4px; }
.article-pagination { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-top: 30px; margin-top: 35px; border-top: 1px solid var(--line); }
.article-pagination a { padding: 21px; border: 1px solid #adc0a3; background: #e7ecd9; }.article-pagination a:hover { background: #dce8c5; }.article-pagination a:last-child { text-align: right; }
.article-pagination span { display: block; color: #5b7256; font-size: 10px; margin-bottom: 10px; }.article-pagination strong { font-size: 17px; font-weight: 550; line-height: 1.6; }
.related-chapters { padding-block: 75px 95px; }.related-chapters > h2 { font-size: 35px; letter-spacing: -.04em; margin-bottom: 30px; }.related-chapters .eyebrow { margin-bottom: 16px; }
.guide-footer { border-top: 1px solid var(--line); padding-block: 38px; display: flex; justify-content: space-between; gap: 40px; }.guide-footer .brand-lockup { width: 220px; }.guide-footer p { font-size: 11px; color: var(--muted); max-width: 400px; margin-top: 17px; }.guide-footer > div:last-child { display: flex; flex-direction: column; gap: 13px; font-size: 11px; text-align: right; }.guide-footer span { color: var(--muted); font: 11px var(--mono); }
@media (max-width:1100px) {
  .catalog-hero { gap: 35px; }.catalog-emblem { padding-inline: 20px; }
  .article-title-grid { grid-template-columns: 110px minmax(0,1fr); gap: 35px; }.article-number { font-size: 95px; }
  .article-layout { grid-template-columns: 185px minmax(0,1fr); gap: 35px; }.article-toc { padding-right: 0; }
  .guide-card-grid { gap: 14px; }.guide-card a { padding: 21px; }.guide-card h3 { font-size: 23px; }
  .diagram-track { grid-template-columns: repeat(calc(var(--node-count) * 2 - 1),minmax(0,1fr)); }.diagram-node { padding-inline: 8px; }.diagram-node strong { font-size: 10px; }.diagram-edge { font-size: 7px; }
}
@media (max-width:900px) {
  .article-layout { display: block; padding-top: 40px; }.guide-article { max-width: 760px; margin-inline: auto; }.article-toc { display: none; }
  .mobile-toc { display: block; border: 1px solid var(--line); padding-inline: 20px; margin-block: 28px; }.mobile-toc summary { padding-block: 17px; display: flex; justify-content: space-between; list-style: none; font-size: 13px; }.mobile-toc summary::-webkit-details-marker { display: none; }.mobile-toc nav { padding-bottom: 12px; }
  .guide-invitation-head { display: block; }.guide-invitation-head .button { margin-top: 24px; }
  .guide-search { grid-template-columns: minmax(0,1fr) 85px; gap: 12px; }.guide-search > label { grid-column: 1/-1; }.guide-search > div { grid-column: 1; }
}
@media (max-width:760px) {
  .guide-mobile-bar { display: flex; justify-content: space-between; padding-block: 13px; font-size: 11px; }
  .catalog-hero { grid-template-columns: 1fr; gap: 30px; padding-block: 45px 55px; }.catalog-emblem { display: none; }.catalog-hero h1 { font-size: 48px; }.catalog-hero > div > p:not(.eyebrow) { font-size: 14px; line-height: 1.9; }
  .guide-card-grid { grid-template-columns: 1fr; gap: 17px; }.guide-card a { padding: 25px; }.guide-card h3 { font-size: 27px; margin-top: 20px; }.guide-card p { font-size: 14px; }.guide-card-bottom { font-size: 11px; }
  .catalog-group { padding-top: 40px; }.catalog-group-heading h2 { font-size: 27px; }.catalog-group-heading { gap: 16px; }.catalog-group-heading p { font-size: 12px; }
  .article-hero { padding-block: 23px 40px; }.breadcrumbs { margin-bottom: 30px; }.article-title-grid { display: block; }.article-number { display: none; }.article-title-grid h1 { font-size: 40px; line-height: 1.25; }.article-dek { font-size: 14px; margin-top: 20px; }.article-title-grid .eyebrow { margin-bottom: 18px; }
  .article-lead { font-size: 16px; line-height: 1.95; }.article-takeaways { padding: 23px; }.article-takeaways li { font-size: 13px; }
  .article-section h2 { font-size: 27px; }.article-section-heading { gap: 13px; margin-bottom: 22px; }.article-section p { font-size: 15px; line-height: 1.95; }.article-list li { font-size: 14px; }
  .worked-example { padding: 23px; }.worked-example h3 { font-size: 21px; }.worked-example p { font-size: 14px; }
  .article-questions h2 { font-size: 27px; }.article-questions summary { font-size: 15px; }.article-questions details > p { font-size: 14px; }.article-closing { font-size: 16px; }
  .related-chapters { padding-block: 55px; }.related-chapters > h2 { font-size: 30px; }
  .guide-invitation { padding-block: 35px; }.guide-invitation-head h2 { font-size: 30px; }.guide-invitation-head p:not(.eyebrow) { font-size: 13px; }.guide-invitation-links { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 22px; }
}
@media (max-width:520px) {
  .guide-page .header { min-height: 76px; }.guide-page .header-github { display: none; }.guide-page .header-actions { gap: 0; }
  .guide-invitation-links { grid-template-columns: 1fr; gap: 0; }.guide-invitation-links a { padding-right: 0; font-size: 13px; }
  .catalog-hero h1 { font-size: 39px; }.catalog-hero .eyebrow { font-size: 9px; }.catalog-body { padding-top: 25px; }.guide-search { grid-template-columns: 1fr; }.guide-search > div { grid-column: 1; }.guide-search > p { text-align: left; }.guide-search input { font-size: 12px; padding-inline: 12px; }.guide-search button { font-size: 10px; padding-inline: 12px; }
  .article-title-grid h1 { font-size: 35px; }.article-hero .breadcrumbs { font-size: 9px; }.article-takeaways { padding: 22px 19px; }
  .guide-diagram { padding: 22px 19px; }.diagram-track { display: flex; flex-direction: column; gap: 0; margin-block: 23px; }.diagram-node { width: 100%; min-height: 75px; flex-direction: row; gap: 17px; padding: 17px; }.diagram-node strong { font-size: 12px; overflow-wrap: normal; }.diagram-step { font-size: 10px; }.diagram-edge { display: flex; align-items: center; justify-content: center; gap: 9px; padding-block: 10px; font-size: 9px; width: 100%; }.diagram-edge i { transform: rotate(90deg); width: 24px; }.diagram-pier img { width: 44px; }
  .article-section-heading { display: block; }.article-section-heading > span { display: block; margin-bottom: 12px; }.article-section h2 { font-size: 27px; }
  .article-pagination { gap: 12px; }.article-pagination a { padding: 17px 13px; }.article-pagination strong { font-size: 14px; }
  .guide-footer { flex-direction: column; gap: 27px; }.guide-footer > div:last-child { text-align: left; flex-direction: row; flex-wrap: wrap; gap: 18px; }.guide-footer .brand-lockup { width: 190px; }
}
@media (prefers-reduced-motion:reduce) { .guide-card a { transition: none; } }
@media print {
  .guide-mobile-bar,.article-toc,.mobile-toc,.article-pagination,.related-chapters,.guide-footer,.guide-search,.guide-invitation,.breadcrumbs { display: none !important; }
  .catalog-opening,.article-opening { background: white; color: black; }.article-dek { color: #333; }.article-title-grid { display: block; }.article-number { display: none; }.article-layout { display: block; }.article-hero { padding-bottom: 10px; }.article-title-grid .eyebrow { color: #333; }
  .article-section h2,.article-questions h2 { break-after: avoid; }.worked-example,.guide-diagram { break-inside: avoid; box-shadow: none; }.guide-article { max-width: none; }.article-section p { font-size: 11pt; }
  .article-questions details::details-content { content-visibility: visible !important; }.article-questions details > p { display: block !important; }
}
.mail-comparison { margin: 3rem 0; }
.mail-comparison h2 { font-size: clamp(1.4rem, 2.5vw, 2rem); line-height: 1.3; }
.mail-table-scroll { overflow-x: auto; margin: 1.5rem 0; border: 1px solid #c5cec5; }
.mail-table-scroll:focus-visible { outline: 3px solid #597c3a; outline-offset: 3px; }
.mail-table-scroll table { width: 100%; table-layout: fixed; border-collapse: collapse; font-size: .875rem; line-height: 1.65; overflow-wrap: anywhere; }
.mail-table-scroll caption { padding: .7rem 1rem; text-align: left; background: #e6e9dc; font-weight: 600; }
.mail-table-scroll th, .mail-table-scroll td { padding: 1rem; vertical-align: top; text-align: left; border-bottom: 1px solid #c5cec5; }
.mail-table-scroll thead { background: #081f29; color: #f2f0e7; }
.mail-table-scroll th[scope="row"] { width: 19%; background: #e9ecdf; }
.mail-table-scroll td { width: 27%; }
.mail-evidence { display: grid; gap: .45rem; margin-top: 1rem; font-size: .75rem; font-weight: 400; }
.mail-evidence a { text-underline-offset: .2em; }
.mail-comparison-basis { font-size: .82rem; color: #4d625f; }
@media screen and (max-width: 900px) {
  .mail-table-scroll table, .mail-table-scroll tbody, .mail-table-scroll tr { display: block; }
  .mail-table-scroll caption { display: block; }
  .mail-table-scroll thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .mail-table-scroll th[scope="row"], .mail-table-scroll td { display: block; width: auto; border: 0; }
  .mail-table-scroll tr + tr { border-top: 2px solid #a7b7a4; }
  .mail-table-scroll th[scope="row"] { font-size: 1rem; }
  .mail-table-scroll td { padding-top: .65rem; padding-bottom: .65rem; }
  .mail-table-scroll td::before { content: attr(data-label); display: block; font-weight: 650; margin-bottom: .3rem; color: #49653d; }
  .mail-evidence { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media print {
  .mail-table-scroll { overflow: visible; }
  .mail-table-scroll table { min-width: 0; font-size: 8pt; }
  .mail-table-scroll th, .mail-table-scroll td { padding: .35rem; }
}