/* Homepage only. Inner pages continue to use oa.css. */
.oa-home {
  background: #101010;
  color: #f5f2ec;
  --muted: #b2b0ab;
  --line: #ffffff24;
  --oa-ambient: 255, 149, 0;
  --accent: rgb(var(--oa-ambient));
  --oa-accent-hover: #ffa629;
}
.oa-home img { display: block; max-width: 100%; }
.oa-home p { text-wrap: pretty; }
.oa-home h2 { font-size: clamp(32px, 3.6vw, 48px); line-height: 1.12; font-weight: 400; letter-spacing: -.045em; }
.oa-home h3 { font-weight: 500; letter-spacing: -.025em; }
.oa-home .oa-eyebrow { font-size: 10px; letter-spacing: .16em; margin-bottom: 20px; }
.oa-home .oa-btn { gap: 24px; font-size: 14px; text-transform: none; letter-spacing: 0; padding: 14px 22px; min-height: 48px; }
.oa-home .oa-btn-primary {
  color: #101010;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: inset 0 1px 0 #ffffff0c, 0 2px 4px #0003,
              0 12px 30px -15px rgba(var(--oa-ambient), .42);
  transition: background-color .25s ease, box-shadow .6s ease, border-color .25s ease;
}
.oa-home .oa-btn-primary:hover, .oa-home .oa-btn-primary:focus-visible {
  background: var(--oa-accent-hover);
  border-color: var(--oa-accent-hover);
  box-shadow: inset 0 1px 0 #ffffff10, 0 2px 4px #0003,
              0 14px 34px -14px rgba(var(--oa-ambient), .58);
  transform: none;
}
.oa-home .oa-btn-primary:active {
  box-shadow: inset 0 1px 3px #0003, 0 8px 22px -15px rgba(var(--oa-ambient), .36);
}
.oa-home a:focus-visible, .oa-home summary:focus-visible { outline: 2px solid var(--oa-accent-hover); outline-offset: 5px; }
.oa-home .oa-book-feature a:focus-visible, .oa-home .oa-book-strip a:focus-visible { outline-color: #24241f; }
.oa-home section[id], .oa-home details[id], .oa-home #main { scroll-margin-top: 88px; }
.oa-skip { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 14px 20px; border-radius: 8px; background: #f5f2ec; color: #101010; }
.oa-skip:focus { top: 12px; }

/* Header and native mobile disclosure. */
.oa-home .oa-nav { background: #101010ed; }
.oa-home .oa-nav .wrap { height: 72px; min-height: 0; padding-top: 0; padding-bottom: 0; flex-wrap: nowrap; gap: 24px; }
.oa-home .oa-name { letter-spacing: .04em; font-size: 13px; }
.oa-home .oa-mark { width: 32px; height: 32px; border-radius: 9px; font-size: 13px; }
.oa-home .oa-menu { display: flex; flex-wrap: nowrap; gap: 26px; }
.oa-home .oa-menu a { text-transform: none; font-size: 13px; letter-spacing: 0; min-height: 44px; }
.oa-mobile-nav { display: none; }

/* A quiet, always-visible entrance to the book. */
.oa-book-strip { background: #ebe8df; color: #292823; }
.oa-book-strip .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 54px; gap: 20px; }
.oa-book-strip p { font-size: 13px; font-weight: 500; }
.oa-book-strip p span { color: #68665e; font-size: 11px; margin-right: 20px; font-weight: 400; }
.oa-book-strip a { display: inline-flex; align-items: center; min-height: 44px; font-size: 12px; gap: 18px; white-space: nowrap; }

/* Portrait, name and one primary action. */
.oa-hero-personal { border-bottom: 1px solid var(--line); }
.oa-hero-layout { display: grid; grid-template-columns: 1.05fr 1fr; grid-template-areas: "heading portrait" "copy portrait"; gap: 24px 64px; padding-top: 64px; padding-bottom: 72px; }
.oa-hero-heading { grid-area: heading; align-self: end; }
.oa-hero-heading h1 { font-size: clamp(62px, 6.2vw, 88px); line-height: 1.02; font-weight: 400; letter-spacing: -.065em; }
.oa-title-dot { color: var(--accent); }
.oa-portrait { grid-area: portrait; margin: 0; align-self: center; }
.oa-portrait img { width: 100%; height: auto; aspect-ratio: 1; object-fit: cover; border-radius: 16px; }
.oa-portrait figcaption { display: flex; justify-content: space-between; gap: 12px; margin-top: 14px; font-size: 11px; color: var(--muted); }
.oa-hero-copy { grid-area: copy; align-self: start; }
.oa-hero-copy > p:first-child { font-size: clamp(18px, 1.6vw, 22px); line-height: 1.5; color: #dedbd5; }
.oa-hero-note { margin-top: 18px; font-size: 14px; line-height: 1.8; color: var(--muted); }
.oa-hero-note a { text-decoration: underline; text-underline-offset: 4px; text-decoration-color: #ffffff50; }
.oa-hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px 24px; margin-top: 30px; }
.oa-text-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 18px; min-height: 44px; font-size: 14px; }
.oa-text-link:hover, .oa-inline-links a:hover { color: var(--accent); }

/* Directions use rows, leaving images to the projects. */
.oa-section { padding: 80px 0; border-bottom: 1px solid var(--line); }
.oa-section-heading { margin-bottom: 42px; }
.oa-heading-split { display: flex; justify-content: space-between; align-items: end; gap: 44px; }
.oa-section-intro { max-width: 34ch; color: var(--muted); font-size: 15px; line-height: 1.7; }
.oa-direction { display: grid; grid-template-columns: 40px .9fr 1.4fr; align-items: start; gap: 24px; padding: 27px 0; border-top: 1px solid var(--line); }
.oa-index { color: var(--accent); font-size: 11px; padding-top: 7px; }
.oa-direction h3 { font-size: 25px; line-height: 1.2; }
.oa-direction p { color: var(--muted); font-size: 15px; max-width: 54ch; }
.oa-inline-links { display: flex; flex-wrap: wrap; gap: 0 22px; margin-top: 10px; }
.oa-inline-links a { display: inline-flex; align-items: center; min-height: 40px; font-size: 12px; border-bottom: 1px solid #ffffff26; }

/* Two real project images, then a compact directory. */
.oa-featured-projects { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.oa-project-image { display: block; position: relative; overflow: hidden; border-radius: 12px; }
.oa-project-image img { width: 100%; aspect-ratio: 1.5; height: auto; object-fit: cover; transition: transform .3s ease; }
.oa-project-image:hover img { transform: scale(1.025); }
.oa-project-image > span { position: absolute; right: 16px; bottom: 16px; width: 40px; height: 40px; display: grid; place-items: center; background: #f5f2ec; color: #101010; border-radius: 50%; font-size: 22px; }
.oa-project-caption { padding: 20px 0 0; }
.oa-project-kind { color: var(--muted); text-transform: uppercase; letter-spacing: .12em; font-size: 9px; }
.oa-project-caption h3 { margin: 8px 0; font-size: 28px; }
.oa-project-caption > p:last-child { color: var(--muted); font-size: 14px; max-width: 46ch; line-height: 1.7; }
.oa-project-directory { margin-top: 36px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.oa-project-directory > a { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 20px 0 0; border-top: 1px solid var(--line); font-size: 16px; }
.oa-project-directory small { display: block; color: var(--muted); font-size: 11px; margin-top: 6px; }
.oa-project-directory a > span:last-child { color: var(--accent); }

/* Typographic book spread, using the book site's warm paper colour. */
.oa-book-feature { background: #f1efe8; color: #24241f; padding: 76px 0; }
.oa-book-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; }
.oa-book-title-page { border-right: 1px solid #29282329; padding-right: 48px; display: flex; flex-direction: column; }
.oa-book-feature .oa-eyebrow { color: #626159; }
.oa-book-title-page h2 { font-size: clamp(64px, 6.6vw, 94px); font-weight: 300; line-height: 1.02; letter-spacing: -.06em; margin: 20px 0; }
.oa-book-title-page h2 span { color: #b7691c; }
.oa-book-signature { font-size: 12px; color: #626159; margin-top: auto; padding-top: 22px; }
.oa-book-status { display: inline-flex; align-items: center; gap: 8px; border: 1px solid #29282333; padding: 6px 10px; border-radius: 999px; font-size: 10px; }
.oa-book-status i { width: 5px; height: 5px; background: #777c5d; border-radius: 50%; }
.oa-book-copy .oa-book-thought { font-size: clamp(23px, 2.5vw, 32px); line-height: 1.2; letter-spacing: -.025em; margin-top: 26px; color: #24241f; }
.oa-book-copy > p { margin-top: 18px; font-size: 14px; line-height: 1.7; color: #626159; }
.oa-book-facts { display: flex; gap: 24px; padding: 18px 0; margin-top: 8px; font-size: 12px; border-bottom: 1px solid #29282329; }
.oa-book-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 22px; margin-top: 24px; }
.oa-book-actions .oa-btn {
  background: #24241f; color: #fff; border-color: #24241f;
  box-shadow: inset 0 1px 0 #ffffff0c, 0 2px 3px #24241f10,
              0 12px 26px -15px rgba(var(--oa-ambient), .26);
  transition: box-shadow .6s ease;
}
.oa-book-actions .oa-btn:hover, .oa-book-actions .oa-btn:focus-visible {
  box-shadow: inset 0 1px 0 #ffffff12, 0 2px 3px #24241f14,
              0 14px 30px -14px rgba(var(--oa-ambient), .36);
}
.oa-book-actions > a:last-child { font-size: 12px; min-height: 44px; display: inline-flex; align-items: center; }
.oa-book-copy .oa-book-note { font-size: 11px; line-height: 1.6; margin-top: 20px; max-width: 48ch; }

/* Compact photo sequence. */
.oa-photo-mosaic { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 18px; align-items: start; }
.oa-photo-mosaic figure { margin: 0; }
.oa-photo-mosaic img { width: 100%; aspect-ratio: 1 / 1.15; object-fit: cover; border-radius: 10px; }
.oa-photo-mosaic .oa-photo-main img { aspect-ratio: 1 / 1.05; }
.oa-photo-mosaic figcaption { margin-top: 12px; font-size: 11px; color: var(--muted); }
.oa-photo-mosaic figure:nth-child(2) { margin-top: 40px; }
.oa-photo-mosaic figure:nth-child(3) { margin-top: 80px; }
.oa-photo-bottom { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin: 28px 0; }
.oa-photo-bottom p { font-size: 13px; color: var(--muted); max-width: 48ch; }

/* Additional detail remains available without a long default page. */
.oa-about-layout, .oa-faq-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 70px; }
.oa-about-text { max-width: 40ch; font-size: 18px; line-height: 1.6; margin-top: 26px; }
.oa-about-name { margin-top: 22px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.oa-about-details { padding-top: 30px; min-width: 0; }
.oa-disclosure, .oa-faq-item { border-top: 1px solid var(--line); }
.oa-disclosure summary, .oa-faq-item summary { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 22px 0; font-size: 16px; cursor: pointer; list-style: none; }
.oa-disclosure summary::-webkit-details-marker, .oa-faq-item summary::-webkit-details-marker, .oa-mobile-nav summary::-webkit-details-marker { display: none; }
.oa-disclosure summary > span, .oa-faq-item summary > span { color: var(--accent); font-size: 22px; flex-shrink: 0; }
.oa-disclosure[open] > summary > span, .oa-faq-item[open] > summary > span { transform: rotate(45deg); }
.oa-disclosure-content, .oa-faq-item > div { padding: 0 0 24px; color: var(--muted); font-size: 14px; line-height: 1.8; }
.oa-disclosure-content > p + p { margin-top: 16px; }
.oa-disclosure-content a, .oa-faq-item p a { color: #f5f2ec; text-decoration: underline; text-underline-offset: 4px; }
/* Readable project structure: content reflows instead of shrinking a diagram. */
.oa-home .oa-disclosure-content .oa-roles-list { margin: 0; display: grid; grid-template-columns: 1fr; gap: 12px; }
.oa-home .oa-disclosure-content .oa-roles-list li { padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: #181715; }
.oa-home .oa-disclosure-content .oa-roles-list h3 { font-size: 20px; line-height: 1.3; color: #f5f2ec; }
.oa-home .oa-disclosure-content .oa-roles-list p { font-size: 16px; line-height: 1.65; }
.oa-structure { grid-column: 1 / -1; min-width: 0; }
.oa-structure > summary { font-size: 22px; }
.oa-structure .oa-disclosure-content { font-size: 16px; line-height: 1.65; }
.oa-structure-founder { display: flex; align-items: center; gap: 20px; padding: 24px 0 32px; max-width: 650px; }
.oa-structure-mark { display: grid; place-items: center; flex-shrink: 0; width: 56px; height: 56px; border: 1px solid #ff880047; border-radius: 16px; background: #24211d; color: #ffab4b; box-shadow: 0 12px 26px -15px rgba(var(--oa-ambient), .3); font-size: 18px; }
.oa-structure-founder h3 { font-size: 22px; color: #f5f2ec; margin-bottom: 6px; }
.oa-structure-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.oa-structure-card { min-width: 0; padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: #181715; overflow-wrap: anywhere; }
.oa-structure .oa-structure-label { margin-bottom: 8px; font-size: 14px; color: #ffab4b; }
.oa-structure-card h3 { display: flex; align-items: center; min-height: 54px; font-size: 22px; line-height: 1.25; color: #f5f2ec; margin-bottom: 12px; }
.oa-structure-card h3 a { display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; min-height: 54px; text-decoration: none; }
.oa-structure-card h3 a span { color: #ffab4b; font-size: 18px; flex-shrink: 0; }
.oa-structure-card a:hover { text-decoration: underline; }
.oa-structure .oa-structure-link { border-top: 1px solid var(--line); padding-top: 16px; margin-top: 20px; }
.oa-structure-link strong { display: block; color: #f5f2ec; font-weight: 500; margin-bottom: 6px; }
.oa-structure-extra { margin-top: 24px; }
.oa-structure-extra summary { font-size: 18px; }
.oa-entry-list { list-style: none; margin: 16px 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 24px; }
.oa-entry-list a { min-height: 48px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 10px 0; }
.oa-entry-list a span:last-child { flex-shrink: 0; }
.oa-structure-tools { color: var(--muted); }
.oa-structure .oa-audiences { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.oa-structure .oa-audiences li { font-size: 16px; line-height: 1.65; padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: #181715; overflow-wrap: anywhere; }
.oa-structure .oa-audiences li::before { content: none; }
.oa-structure .oa-audiences strong { display: block; margin-bottom: 8px; }
@media (min-width: 761px) and (max-width: 1100px) { .oa-structure-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 760px) {
  .oa-structure-grid, .oa-entry-list, .oa-structure .oa-audiences { grid-template-columns: 1fr; }
  .oa-structure > summary { font-size: 20px; }
  .oa-structure-founder { align-items: flex-start; gap: 14px; padding-top: 12px; }
  .oa-structure-mark { width: 44px; height: 44px; border-radius: 12px; font-size: 16px; }
  .oa-structure-founder h3, .oa-structure-card h3 { font-size: 20px; }
  .oa-structure-card { padding: 20px; }
}
.oa-faq-item summary { font-size: 14px; }
.oa-faq-list { min-width: 0; }

/* One direct contact and the existing cross-site footer. */
.oa-contact-personal { padding: 72px 0; background: #181715; }
.oa-contact-heading { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.oa-contact-heading h2 { font-size: clamp(36px, 4.6vw, 62px); }
.oa-contact-heading h2 span { color: var(--accent); }
.oa-contact-baseline { display: flex; justify-content: space-between; gap: 24px; margin-top: 24px; color: var(--muted); font-size: 12px; }
.oa-home .ecosystem-ring { font-size: 11px !important; color: var(--muted); margin-top: 0 !important; padding-top: 30px !important; border: 0 !important; }
.oa-home .ecosystem-ring > div { font-size: 11px; font-weight: 400 !important; }
.oa-home .oa-foot { background: #101010; border: 0; padding: 26px 0; }
.oa-home .oa-foot-row { gap: 16px; letter-spacing: 0; font-size: 10px; }

@media (max-width: 1000px) {
  .oa-hero-layout { gap: 24px 36px; }
  .oa-hero-heading h1 { font-size: clamp(56px, 6.5vw, 70px); }
  .oa-home .oa-menu { gap: 18px; }
  .oa-home .oa-menu a { font-size: 12px; }
  .oa-direction { grid-template-columns: 28px .8fr 1.2fr; gap: 20px; }
  .oa-direction h3 { font-size: 22px; }
  .oa-book-layout, .oa-about-layout, .oa-faq-layout { gap: 36px; }
}
@media (max-width: 760px) {
  .oa-home .oa-nav .wrap { height: 64px; gap: 16px; }
  .oa-home .oa-desktop-menu { display: none; }
  .oa-mobile-nav { display: block; }
  .oa-mobile-nav > summary { display: flex; align-items: center; justify-content: center; gap: 14px; min-height: 44px; padding: 0 4px 0 12px; cursor: pointer; list-style: none; font-size: 12px; }
  .oa-mobile-nav[open] > summary { color: var(--accent); }
  .oa-mobile-nav nav { position: absolute; left: 0; right: 0; top: 100%; padding: 12px var(--pad) 22px; border-bottom: 1px solid #ffffff35; background: #171716; box-shadow: 0 20px 32px #0007; }
  .oa-mobile-nav nav a { display: flex; align-items: center; min-height: 48px; border-bottom: 1px solid var(--line); font-size: 16px; }
  .oa-book-strip .wrap { min-height: 60px; gap: 16px; }
  .oa-book-strip p { font-size: 12px; line-height: 1.4; }
  .oa-book-strip p span { display: block; margin: 0 0 2px; font-size: 9px; }
  .oa-book-strip a { gap: 10px; }
  .oa-hero-layout { grid-template-columns: 1fr; grid-template-areas: "heading" "portrait" "copy"; gap: 26px; padding-top: 32px; padding-bottom: 48px; }
  .oa-hero-heading .oa-eyebrow { font-size: 9px; margin-bottom: 18px; letter-spacing: .1em; }
  .oa-hero-heading h1 { font-size: clamp(48px, 12.5vw, 74px); line-height: 1; }
  .oa-portrait img { aspect-ratio: 1.25; object-position: 50% 38%; border-radius: 10px; }
  .oa-portrait figcaption { margin-top: 10px; font-size: 10px; }
  .oa-hero-copy > p:first-child { font-size: 18px; }
  .oa-hero-note { margin-top: 12px; font-size: 13px; }
  .oa-hero-actions { margin-top: 22px; gap: 8px 20px; }
  .oa-hero-actions .oa-text-link { font-size: 12px; }
  .oa-section { padding: 48px 0; }
  .oa-section-heading { margin-bottom: 30px; }
  .oa-heading-split { display: block; }
  .oa-section-intro { margin-top: 20px; font-size: 14px; }
  .oa-direction { grid-template-columns: 24px 1fr; gap: 12px; padding: 22px 0; }
  .oa-direction > div { grid-column: 2; }
  .oa-direction p { font-size: 14px; }
  .oa-inline-links { gap: 0 20px; margin-top: 6px; }
  .oa-inline-links a { min-height: 44px; }
  .oa-featured-projects { grid-template-columns: 1fr; gap: 34px; }
  .oa-project-caption h3 { font-size: 25px; }
  .oa-project-directory { grid-template-columns: 1fr; gap: 0; margin-top: 28px; }
  .oa-project-directory > a { padding: 18px 0; }
  .oa-book-feature { padding: 48px 0; }
  .oa-book-layout { grid-template-columns: 1fr; gap: 30px; }
  .oa-book-title-page { padding: 0 0 28px; border-right: 0; border-bottom: 1px solid #29282329; }
  .oa-book-title-page h2 { font-size: clamp(58px, 14vw, 84px); margin: 0; }
  .oa-book-signature { padding-top: 18px; font-size: 11px; }
  .oa-book-copy .oa-book-thought { font-size: 25px; margin-top: 20px; }
  .oa-book-copy > p { font-size: 14px; margin-top: 14px; }
  .oa-photo-mosaic { grid-template-columns: 1fr 1fr; gap: 16px 12px; }
  .oa-photo-mosaic .oa-photo-main { grid-column: 1 / -1; }
  .oa-photo-mosaic .oa-photo-main img { aspect-ratio: 1.2; object-position: 50% 35%; }
  .oa-photo-mosaic figure:nth-child(2), .oa-photo-mosaic figure:nth-child(3) { margin: 0; }
  .oa-photo-mosaic img { aspect-ratio: 1; }
  .oa-photo-mosaic figcaption { font-size: 10px; margin-top: 8px; }
  .oa-photo-bottom { display: block; margin-top: 22px; }
  .oa-photo-bottom .oa-text-link { margin-top: 12px; }
  .oa-about-layout, .oa-faq-layout { grid-template-columns: 1fr; gap: 28px; }
  .oa-about-text { font-size: 17px; }
  .oa-about-details { padding-top: 0; }
  .oa-contact-personal { padding: 48px 0; }
  .oa-contact-heading { display: block; }
  .oa-contact-heading .oa-btn { margin-top: 24px; }
  .oa-contact-baseline { flex-direction: column; gap: 18px; }
  .oa-home .oa-foot-row { flex-direction: column; align-items: start; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  .oa-home *, .oa-home *::before, .oa-home *::after { scroll-behavior: auto !important; transition: none !important; }
}

/* Анонс выставки «Драматическая тишина» (photo.sashakit.ru), 21.10.2026 */
.oa-exhibit { display: grid; grid-template-columns: 1.25fr 1fr; gap: 0; margin: 34px 0 8px; background: #0b0b0b; border: 1px solid var(--line); color: inherit; text-decoration: none; overflow: hidden; transition: border-color .25s; }
.oa-exhibit:hover { border-color: var(--accent); }
.oa-exhibit-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; }
.oa-exhibit-strip img { width: 100%; height: 100%; aspect-ratio: 3 / 4; object-fit: cover; filter: grayscale(1); transition: transform .8s cubic-bezier(.2,.7,0,1); }
.oa-exhibit:hover .oa-exhibit-strip img { transform: scale(1.03); }
.oa-exhibit-copy { padding: clamp(24px, 3vw, 44px); display: flex; flex-direction: column; justify-content: center; gap: 14px; }
.oa-exhibit-copy .oa-eyebrow i { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: #e1251b; margin-right: 6px; vertical-align: 1px; }
.oa-exhibit-copy h3 { font-size: clamp(30px, 3.4vw, 48px); line-height: .95; text-transform: uppercase; letter-spacing: -.02em; font-weight: 700; }
.oa-exhibit-copy p { color: var(--muted); max-width: 36ch; }
.oa-exhibit-copy .oa-btn { align-self: flex-start; margin-top: 6px; }
@media (max-width: 900px) { .oa-exhibit { grid-template-columns: 1fr; } }