/* V14: keep the portfolio's monochrome editorial system within the reference structure. */
/* A compact portfolio teaser; the full catalogue is a dedicated route view. */
html:not(.essentials-view) #arch-essentials { display:none; }
html.essentials-view #tab-architecture > section:not(#arch-essentials),
html.essentials-view #tab-architecture > footer { display:none; }
html.essentials-view #arch-essentials { display:block; min-height:100vh; }
.essentials-back { display:inline-block; margin-bottom:32px; color:inherit; text-decoration:none; font:500 .875rem/1.5 var(--font-heading); }
.essentials-teaser { padding:84px 0; background:#f7f7f5; color:var(--black); scroll-margin-top:120px; }
.essentials-teaser-inner { width:min(1380px,calc(100% - 104px)); margin:auto; display:grid; grid-template-columns:1.3fr 1fr; align-items:center; gap:48px; border-top:1px solid rgba(31,31,34,.2); padding-top:36px; }
.essentials-teaser h2 { margin:20px 0; font:800 clamp(2.5rem,5.7vw,6.5rem)/1 var(--font-heading); letter-spacing:-.065em; }
.essentials-teaser h2 a { color:inherit; text-decoration:none; }
.essentials-teaser h2 span { font-size:.45em; vertical-align:middle; }
.essentials-teaser-copy p { max-width:380px; font-size:1rem; line-height:1.7; color:#626265; }
.essentials-teaser-link { display:inline-block; margin-top:28px; border-bottom:1px solid currentColor; padding-bottom:5px; color:inherit; font:600 .875rem/1.5 var(--font-heading); text-decoration:none; }
.essentials-product-window { display:block; position:relative; overflow:hidden; height:280px; background:#efefec; color:var(--black); }
.essentials-preview-slide { position:absolute; inset:0; margin:0; display:flex; flex-direction:column; align-items:center; justify-content:center; opacity:0; animation:essentials-product-slide 12s infinite; }
.essentials-preview-slide:nth-child(2){animation-delay:4s;}
.essentials-preview-slide:nth-child(3){animation-delay:8s;}
.essentials-preview-slide img { width:85%; height:205px; object-fit:contain; mix-blend-mode:multiply; }
.essentials-preview-slide figcaption { margin-top:10px; padding:6px 12px; background:var(--black); color:white; font:500 .75rem/1.4 var(--font-heading); letter-spacing:.04em; }
.essentials-preview-pause { float:right; border:0; background:none; padding:10px 0; color:#626265; font:400 .75rem/1.5 var(--font-body); cursor:pointer; }
.essentials-teaser-preview.is-paused .essentials-preview-slide,
.essentials-teaser-preview:hover .essentials-preview-slide,
.essentials-teaser-preview:focus-within .essentials-preview-slide { animation-play-state:paused; }
.essentials-teaser a:focus-visible,.essentials-preview-pause:focus-visible,.essentials-back:focus-visible { outline:2px solid currentColor; outline-offset:5px; }
@keyframes essentials-product-slide { 0%{opacity:0;transform:translateX(18%);} 5%,28%{opacity:1;transform:translateX(0);} 33%,100%{opacity:0;transform:translateX(-18%);} }
@media(max-width:768px) { .essentials-teaser{padding:60px 0;} .essentials-teaser-inner{width:calc(100% - 40px);grid-template-columns:1fr;gap:30px;} .essentials-teaser h2{font-size:clamp(2.4rem,10vw,4.5rem);} .essentials-product-window{height:250px;} .essentials-preview-slide img{height:180px;} }
@media(prefers-reduced-motion:reduce) { .essentials-preview-slide{animation:none;opacity:0;transform:none;} .essentials-preview-slide:first-child{opacity:1;} .essentials-preview-pause{display:none;} }
.arch-essentials-section { --ess-ink:#2c2c2e; --ess-paper:#f7f7f5; --ess-line:rgba(44,44,46,.18); --ess-soft:#626265; background:var(--ess-paper); scroll-margin-top:64px; }
.arch-essentials-section *, .essentials-modal * { min-width:0; }
.essentials-inner { width:min(1380px,calc(100% - 104px)); }
.essentials-hero { min-height:490px; grid-template-columns:1.4fr .6fr; gap:5vw; padding-bottom:80px; }
#arch-essentials .section-tag { color:var(--ess-ink); font-size:.75rem; letter-spacing:.14em; }
#arch-essentials .section-tag::before { background:var(--ess-ink); }
#arch-essentials .essentials-title { font-size:clamp(4rem,8.3vw,8.3rem); font-weight:500!important; line-height:.94; letter-spacing:-.065em; }
#arch-essentials .essentials-title em { color:var(--ess-ink); font-family:Georgia,serif!important; font-style:italic; font-weight:400; letter-spacing:-.045em; text-transform:none; }
.essentials-intro { border-top:0; border-left:1px solid var(--ess-ink); padding:0 0 0 26px; margin-bottom:10px; }
.essentials-intro p { font-size:1rem; }
.essentials-intro span { font-size:.75rem; line-height:1.6; letter-spacing:.07em; }
.essentials-category-grid { grid-template-columns:repeat(6,minmax(0,1fr)); }
.essentials-category { min-height:185px; padding:20px; }
.essentials-category span,.essentials-category small { font-size:.75rem; letter-spacing:.04em; line-height:1.5; }
.essentials-category strong { font-size:.875rem; line-height:1.4; }
.essentials-category.future:not(:hover) strong { color:var(--ess-soft); }
.essentials-finder { background:#fff; grid-template-columns:.8fr 1.2fr; }
.essentials-label { color:var(--ess-ink); font-size:.75rem; letter-spacing:.1em; line-height:1.5; }
.essentials-finder h3,.essentials-browser-head h3 { font-weight:500!important; line-height:1.03; letter-spacing:-.05em; }
.essentials-finder-copy p,.essentials-browser-head p,.essentials-finder-result p { font-size:1rem; line-height:1.75; }
.essentials-question label { font-size:.8rem; line-height:1.5; }
.essential-chip,.essential-filter { border-radius:999px; padding:10px 15px; font-size:.875rem; letter-spacing:0; min-height:44px; }
.essential-chip:hover,.essential-chip.active,.essential-filter:hover,.essential-filter.active { background:var(--ess-ink); border-color:var(--ess-ink); color:white; }
.essentials-finder-result strong { font-weight:500!important; line-height:1.14; }
.essentials-toolbar { grid-template-columns:1fr; gap:16px; }
.essentials-toolbar input { font-size:1rem; min-height:48px; }
.essentials-toolbar input:focus { border-color:var(--ess-ink); }
.essentials-results,.essentials-inline-disclosure { font:400 .8rem/1.6 var(--font-body); color:var(--ess-soft); margin:10px 0; }
.essentials-inline-disclosure { margin-bottom:24px; }
.essentials-products { grid-template-columns:repeat(3,minmax(0,1fr)); scroll-margin-top:140px; }
.essential-product { min-height:0; background:#fff; }
.essential-product-visual { height:auto; aspect-ratio:4/3; background:#efefec; border-bottom:1px solid var(--ess-line); }
.essential-product-visual::before { display:none; }
.essential-product-visual img { width:100%; height:100%; object-fit:contain; padding:48px 28px 30px; mix-blend-mode:multiply; transition:transform .35s; }
.essential-product:hover .essential-product-visual img { transform:scale(1.025); }
.essential-product-rank { color:var(--ess-ink); font-size:.75rem; top:16px; left:18px; right:18px; letter-spacing:.03em; }
.essential-image-note { font:400 .75rem/1.5 var(--font-body); color:var(--ess-soft); padding:10px 24px 0; }
.essential-product-meta { font-size:.75rem; letter-spacing:.04em; line-height:1.5; }
.essential-product-meta b { color:var(--ess-ink); }
.essential-product h4 { font-weight:500!important; font-size:clamp(1.5rem,2.4vw,2.3rem); line-height:1.08; letter-spacing:-.04em; }
.essential-product-model { font-size:.75rem; color:var(--ess-soft); line-height:1.5; }
.essential-product-description { font-size:1rem; line-height:1.65; }
.essential-product-specs span { font-size:.75rem; }
.essential-product-actions { gap:8px; }
.essential-product-actions button,.essential-product-actions a { font-size:.8rem; line-height:1.5; letter-spacing:0; text-transform:none; min-height:46px; display:flex; align-items:center; justify-content:center; }
.essential-link-state { font-size:.75rem; line-height:1.5; letter-spacing:0; text-transform:none; color:var(--ess-soft); }
.essentials-ranking-note { background:var(--ess-ink); }
.essentials-ranking-note h3 { font-weight:500!important; line-height:1.02; }
.essentials-ranking-note p { font-size:1rem; }
.essentials-ranking li { grid-template-columns:30px 1fr; }
.essentials-ranking li::before { color:var(--ess-ink); font-size:.8rem; grid-row:span 2; }
.essentials-ranking li span { font-weight:500!important; line-height:1.4; }
.essentials-ranking li small { grid-column:2; text-align:left; font-size:.875rem; }
.essentials-disclosure strong { font-size:.75rem; line-height:1.5; }
.essentials-disclosure p { font-size:.875rem; }
.essentials-roadmap-grid span { color:var(--ess-ink); font-size:.8rem; line-height:1.5; }
.essentials-roadmap-grid p { font-size:.95rem; line-height:1.8; }
.essentials-modal-panel { background:#f7f7f5; --ess-soft:#626265; }
.essentials-modal h3 { font-weight:500!important; line-height:1.04; }
.essentials-modal-sub { color:#626265; font-size:.8rem; line-height:1.6; }
.essentials-modal-grid div { background:#f7f7f5; }
.essentials-modal-grid small { font-size:.75rem; }
.essentials-modal-grid strong,.essentials-modal ul,.essentials-modal-advice { font-size:1rem; }
.essentials-modal h4 { font-size:.875rem; }
.essentials-modal-advice { background:#eaeae7; border-color:#2c2c2e; }
.essentials-modal-source { display:block; color:#2c2c2e; margin:22px 0; text-decoration:underline; font-size:.875rem; }
.essentials-modal .essential-product-actions { margin-top:26px; }
.essentials-empty { padding:40px; border:1px solid var(--ess-line); }
.essentials-empty[hidden] { display:none; }
.essentials-empty h4 { font:500 1.6rem/1.2 var(--font-heading); }
.essentials-empty p { padding:12px 0; }
.essentials-empty button { background:var(--ess-ink); border:0; color:white; padding:14px 20px; cursor:pointer; }
.arch-essentials-shortcut { color:inherit; text-decoration:none; font:600 .8rem/1.4 var(--font-heading); margin-left:auto; margin-right:24px; }
#arch-essentials :focus-visible,.essentials-modal :focus-visible,.arch-essentials-shortcut:focus-visible { outline:2px solid currentColor; outline-offset:4px; }
body.arch-cursor-on #arch-essentials,body.arch-cursor-on #arch-essentials button,body.arch-cursor-on #arch-essentials a { cursor:auto; }
body.arch-cursor-on #arch-essentials button,body.arch-cursor-on #arch-essentials a { cursor:pointer; }
@media(max-width:1100px) { .essentials-products { grid-template-columns:repeat(2,minmax(0,1fr)); } .essentials-category-grid {grid-template-columns:repeat(3,minmax(0,1fr));} .essentials-hero {grid-template-columns:1fr;gap:38px;} .essentials-intro{max-width:540px;} }
@media(max-width:768px) {
  .arch-essentials-section{scroll-margin-top:116px;padding-top:64px;}
  .essentials-inner{width:calc(100% - 40px);}
  #arch-essentials .essentials-title{font-size:clamp(3.3rem,13vw,5.8rem);line-height:1;}
  .essentials-hero{min-height:0;padding-bottom:52px;}
  .essentials-category-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .essentials-category{min-height:154px;padding:16px;}
  .essentials-finder,.essentials-ranking,.essentials-browser-head{grid-template-columns:1fr;}
  .essentials-finder-copy,.essentials-finder-ui{padding:24px;}
  .essentials-finder-copy{border-right:0;border-bottom:1px solid var(--ess-line);}
  .essentials-products{grid-template-columns:1fr;}
  .essential-product-visual{aspect-ratio:4/3;}
  .essential-product h4{font-size:2rem;}
  .essentials-filter-row{flex-wrap:wrap;overflow:visible;}
  .essentials-ranking-note{min-height:0;padding:30px;}
  .essentials-ranking-note h3{margin-top:30px;}
  .essentials-roadmap-grid{grid-template-columns:1fr;}
  .essentials-disclosure{grid-template-columns:1fr;gap:12px;}
  .essentials-disclosure strong{justify-self:start;}
  .arch-essentials-shortcut{font-size:.7rem;margin:0 12px 0 auto;white-space:nowrap;}
  #tab-architecture>nav .nav-logo{max-width:calc(100vw - 172px);}
  .essentials-modal-panel{padding:26px;}
  .essentials-modal h3{font-size:2.7rem;}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto!important;} .essential-product-visual img{transition:none;} }

/* Typographic product preview until product photography is supplied. */
.essential-product-wordmark { display: block; padding: 64px 20px 24px; font-family: inherit; font-size: clamp(26px, 4vw, 48px); font-weight: 800; letter-spacing: -.045em; line-height: 1; text-align: center; white-space: pre-line; color: inherit; }

/* Additional guide content uses the existing editorial tokens and compact rules. */
.essentials-category[data-essential-category="all"] {grid-column:1/-1;min-height:0;display:flex;align-items:center;gap:20px;padding:18px 20px;}
.essentials-category[data-essential-category="all"] small {margin-left:auto;}
.essentials-starter {margin:0 0 64px;}
.essentials-editor-note {font-size:.85rem;line-height:1.7;color:var(--ess-soft);max-width:800px;margin-top:24px;}
.essentials-kit-link {display:inline-block;background:none;color:inherit;border:0;border-bottom:1px solid currentColor;padding:10px 0;margin-top:14px;font:500 .85rem/1.5 var(--font-heading);cursor:pointer;text-align:left;}
.essentials-priority-row {display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 22px;}
.essential-priority {background:transparent;color:var(--ess-ink);border:1px solid var(--ess-line);padding:10px 14px;font:500 .8rem/1.5 var(--font-heading);cursor:pointer;}
.essential-priority.active {background:var(--ess-ink);color:var(--ess-paper);}
.essential-text-heading {padding:24px 24px 0;font:500 .75rem/1.5 var(--font-heading);text-transform:uppercase;letter-spacing:.08em;color:var(--ess-soft);}
.essential-pick-basis {font-size:.7rem;line-height:1.6;letter-spacing:.03em;color:var(--ess-soft);margin:16px 0 10px;}
.essential-personal-note {font:italic 1rem/1.6 Georgia,serif;border-left:1px solid currentColor;padding-left:14px;margin:20px 0;}
#essentials-load-more {margin:28px 0;}
#essentials-load-more[hidden] {display:none;}

/* V16: quiet product photography, shorter cards and generous whitespace. */
.essentials-inner {width:min(1320px,calc(100% - 112px));}
.essentials-hero {min-height:0;padding:48px 0 88px;}
.essentials-intro {border-left:0;padding:0;}
.essentials-intro p {max-width:330px;line-height:1.8;}
.essentials-intro span {display:block;margin-top:24px;letter-spacing:0;color:var(--ess-soft);}
.essentials-category-grid {margin-bottom:76px;gap:0;border-left:0;}
.essentials-category {min-height:132px;border:0;border-top:1px solid var(--ess-line);padding:24px 18px;background:transparent;}
.essentials-category strong {margin:12px 0 0;font-weight:500;}
.essentials-category small {display:none;}
.essentials-category.active {background:var(--ess-ink);color:white;}
.essentials-category.active strong,.essentials-category.active span {color:inherit;}
.essentials-starter {margin-bottom:64px;}
.essentials-starter .essentials-browser-head {margin-top:0;margin-bottom:36px;}
.essentials-starter .essentials-roadmap-grid {border:0;gap:32px;}
.essentials-starter .essentials-roadmap-grid article {border:0;border-top:1px solid var(--ess-line);padding:26px 0;min-height:0;}
.essentials-starter .essentials-roadmap-grid p {margin-top:20px;font-size:.9rem;}
.essentials-editor-note {margin-top:8px;}
.essentials-browser-head {margin:76px 0 36px;}
.essentials-toolbar {gap:24px;padding:0;border:0;}
.essentials-priority-row {margin:24px 0 32px;gap:8px;}
.essential-priority {border-color:transparent;padding:9px 12px;}
.essentials-results {margin:0 0 16px;}
.essentials-inline-disclosure {max-width:800px;line-height:1.7;margin-bottom:36px;font-size:.75rem;}
.essentials-products {border:0;gap:64px 32px;align-items:stretch;}
.essential-product {min-height:0;border:0;background:transparent;}
.essential-product-visual {height:auto;aspect-ratio:4/3;background:#fff;}
.essential-product-visual::before {display:none;}
.essential-product-visual img {width:84%;height:84%;object-fit:contain;mix-blend-mode:normal;filter:none;transform:none;max-width:100%;}
.essential-product:hover .essential-product-visual img {transform:none;}
.essential-product-body {padding:26px 0 0;}
.essential-pick-basis {margin:0 0 14px;font-size:.7rem;letter-spacing:.04em;line-height:1.6;}
.essential-product h4 {font:500 clamp(1.15rem,1.7vw,1.5rem)/1.35 var(--font-heading);letter-spacing:-.03em;text-transform:none;margin:0;}
.essential-product-description {font-size:.9rem;line-height:1.75;margin:12px 0 28px;}
.essential-product-actions {gap:16px;}
.essential-product-actions button,.essential-product-actions a {font-size:.75rem;font-weight:500;letter-spacing:0;min-height:46px;padding:12px 8px;}
.essential-product-actions button {border:0;border-bottom:1px solid var(--ess-line);justify-content:flex-start;padding-left:0;}
#essentials-load-more {display:block;margin:48px auto 72px;min-height:48px;}
#essentials-load-more[hidden] {display:none;}
.essentials-guide-fold {border-top:1px solid var(--ess-line);margin:28px 0;}
.essentials-guide-fold>summary {display:flex;justify-content:space-between;align-items:center;gap:24px;list-style:none;cursor:pointer;padding:26px 0;font:500 1rem/1.5 var(--font-heading);}
.essentials-guide-fold>summary::-webkit-details-marker {display:none;}
.essentials-guide-fold>summary span {font-size:1.5rem;}
.essentials-guide-fold[open]>summary span {transform:rotate(45deg);}
.essentials-guide-fold .essentials-finder,.essentials-guide-fold .essentials-ranking {margin:16px 0 48px;}
.essentials-guide-fold .essentials-browser-head {margin:24px 0 36px;}
.essentials-disclosure {margin-top:56px;}
@media(max-width:1100px){.essentials-products {grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(max-width:768px){
 .essentials-inner{width:calc(100% - 40px);}
 .essentials-hero{padding:20px 0 56px;gap:32px;}
 .essentials-category-grid{margin-bottom:48px;}
 .essentials-category{min-height:120px;padding:20px 14px;}
 .essentials-starter .essentials-roadmap-grid{gap:0;}
 .essentials-products{grid-template-columns:1fr;gap:48px;}
 .essential-product h4{font-size:1.4rem;}
 .essential-product-body{padding-top:24px;}
 .essentials-browser-head{margin-top:48px;}
 .essentials-toolbar{gap:18px;}
 .essentials-guide-fold>summary{font-size:.9rem;}
}

/* v17 mobile refinements: image space, touch targets, safe-area insets. */
.essential-product-visual img { padding:0; }
.essential-priority { min-height:44px; }
.essentials-modal-close { width:44px; height:44px; z-index:1; background:#f7f7f5; }
.essentials-modal-panel { overscroll-behavior:contain; padding-bottom:max(28px,env(safe-area-inset-bottom)); }
.essentials-modal-panel h2 { padding-right:48px; overflow-wrap:anywhere; }
.essential-product, .essentials-toolbar, .essentials-search { min-width:0; }
@media(max-width:768px) {
 .essentials-modal-close { top:max(16px,env(safe-area-inset-top)); right:max(16px,env(safe-area-inset-right)); }
 .essentials-modal-panel { padding-top:max(28px,env(safe-area-inset-top)); }
}

/* v18 draft: purchase actions stay legible inside the body-mounted dialog. */
.essentials-modal { --ess-ink:#171719; --ess-line:rgba(23,23,25,.2); }
.essential-product-actions a.primary,
.essentials-modal .essential-product-actions a.primary {
 background:#171719; color:#fff; border:1px solid #171719;
 min-height:48px; padding:14px 20px; font-weight:600; text-decoration:none;
}
.essential-product-actions a.primary:hover,
.essentials-modal .essential-product-actions a.primary:hover { background:#353537; border-color:#353537; color:#fff; }
.essential-product-actions a.primary:focus-visible { outline:2px solid #171719; outline-offset:4px; }
.essential-link-pending { display:flex; align-items:center; justify-content:center; padding:12px; min-height:48px; font-size:.8rem; line-height:1.5; color:#626265; }
.essentials-modal .essential-product-actions { display:flex; }
.essentials-modal .essential-product-actions a.primary { width:100%; }

/* v19: visual, mobile-first entry into the three existing kit filters. */
.essentials-starter .essentials-browser-head {align-items:end;gap:24px;margin-bottom:32px;}
.essentials-starter .essentials-browser-head h3 {font-size:clamp(2.5rem,5vw,4.6rem);line-height:1.02;letter-spacing:-.055em;margin-top:16px;}
.essentials-starter .essentials-browser-head>p {font-size:1rem;line-height:1.7;max-width:340px;margin:0;}
.essentials-kit-grid {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.essentials-kit-card {min-width:0;display:flex;flex-direction:column;padding:24px;background:#fff;border:1px solid var(--ess-line);}
.essentials-kit-meta {display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;font:500 .75rem/1.5 var(--font-heading);}
.essentials-kit-tag {border:1px solid var(--ess-line);padding:4px 9px;border-radius:20px;}
.essentials-kit-first {border-color:#171719;}
.essentials-kit-first .essentials-kit-tag {background:#171719;border-color:#171719;color:#fff;}
.essentials-kit-photo {aspect-ratio:4/3;display:grid;place-items:center;margin:20px 0 24px;overflow:hidden;background:#fff;}
.essentials-kit-photo img {display:block;width:88%;height:100%;max-height:240px;object-fit:contain;transition:transform .25s ease;}
.essentials-kit-card h4 {font:500 clamp(1.35rem,2vw,1.7rem)/1.2 var(--font-heading);letter-spacing:-.035em;margin:0;overflow-wrap:break-word;}
.essentials-kit-card>p {font-size:1rem;line-height:1.65;color:#626265;margin:14px 0 24px;}
.essentials-kit-card .essentials-kit-link {display:flex;justify-content:space-between;align-items:center;gap:12px;width:100%;min-height:52px;margin-top:auto;padding:14px 16px;border:1px solid #171719;font-size:.875rem;line-height:1.5;}
.essentials-kit-first .essentials-kit-link {background:#171719;color:#fff;}
.essentials-kit-card .essentials-kit-link:hover {background:#353537;color:#fff;}
.essentials-kit-card .essentials-kit-link:focus-visible {outline:3px solid #171719;outline-offset:4px;}
.essentials-starter .essentials-editor-note {margin-top:22px;font-size:.875rem;}
@media(hover:hover) and (prefers-reduced-motion:no-preference) {.essentials-kit-card:hover .essentials-kit-photo img {transform:scale(1.035);}}
@media(max-width:1050px) {.essentials-kit-grid {gap:14px;}.essentials-kit-card {padding:18px;}}
@media(max-width:760px) {
 .essentials-starter .essentials-browser-head {display:block;margin-bottom:24px;}
 .essentials-starter .essentials-browser-head>p {margin-top:20px;}
 .essentials-kit-grid {grid-template-columns:1fr;gap:20px;}
 .essentials-kit-card {padding:22px;}
 .essentials-kit-photo {aspect-ratio:16/9;margin:18px 0 22px;}
 .essentials-kit-photo img {max-height:210px;}
 .essentials-kit-card h4 {font-size:1.65rem;}
}
@media(prefers-reduced-motion:reduce) {.essentials-kit-photo img {transition:none;}}