/* Folio system: the shared language of every page.
   Geometry: one slash angle (the circle name //すらっしゅ// as editorial motif).
   Grounds: ink or paper. Each world adds one accent; photographs carry the rest. */
@font-face { font-family: "Archivo"; src: url("fonts/archivo-latin.woff2") format("woff2"); font-weight: 100 900; font-stretch: 62% 125%; font-display: swap; }
@font-face { font-family: "Folio UI Sans"; src: url("fonts/folio-japanese-regular.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Folio UI Sans"; src: url("fonts/folio-japanese-bold.woff2") format("woff2"); font-weight: 700; font-display: swap; }

:root {
  --f-ink: #0b0c11;
  --f-ink-2: #15171f;
  --f-ink-3: #20232e;
  --f-paper: #f2ede4;
  --f-paper-2: #e6dfd2;
  --f-on-ink: #f4efe6;
  --f-on-ink-soft: #bdb6ab;
  --f-on-paper: #17161a;
  --f-on-paper-soft: #5a554e;
  --f-line-ink: rgba(244, 239, 230, .16);
  --f-line-paper: rgba(23, 22, 26, .16);
  --f-accent: #d6303c;
  --f-latin: "Archivo", "Folio UI Sans", system-ui, sans-serif;
  --f-sans: "Folio UI Sans", "Archivo", "Hiragino Sans", "Yu Gothic UI", system-ui, sans-serif;
  --f-cut: 2.2rem;            /* horizontal run of the slash over a panel's height */
  --f-gutter: clamp(16px, 4vw, 56px);
  --f-max: 1360px;
  --f-ease: cubic-bezier(.2, .8, .2, 1);
  --f-ease-in: cubic-bezier(.6, 0, .8, .2);
}

html { scroll-padding-top: 76px; }
@media (max-width: 640px) { html { scroll-padding-top: 100px; } }

/* Headings and quotations never leave a lone character on the last line. */
:is(h1, h2, h3, blockquote) { text-wrap: balance; line-break: strict; }

/* Type roles ---------------------------------------------------------- */
.f-index { font: 600 11px/1.4 var(--f-latin); font-stretch: 112%; letter-spacing: .16em; text-transform: uppercase; }
.f-title { font: 700 clamp(30px, 4.6vw, 64px)/1.18 var(--f-sans); letter-spacing: -.01em; margin: 0; }
.f-lead { font: 400 clamp(15px, 1.3vw, 17px)/1.95 var(--f-sans); margin: 0; }

/* The cut: a slanted window. Always for a part of a photograph, never decoration. */
.f-cut { clip-path: polygon(var(--f-cut) 0, 100% 0, calc(100% - var(--f-cut)) 100%, 0 100%); }

/* Detail cuts and their marker on the complete photograph (shared by home and features). */
.cut-window { position: relative; display: block; aspect-ratio: 4 / 3; overflow: hidden; background: var(--f-ink-3); clip-path: polygon(var(--f-cut) 0, 100% 0, calc(100% - var(--f-cut)) 100%, 0 100%); transition: clip-path .35s var(--f-ease); }
.cut-window img { position: absolute; max-width: none; height: auto; }
.cut-marker { position: absolute; z-index: 2; pointer-events: none; border: 2px solid #fff; box-shadow: 0 0 0 100vmax rgba(8, 9, 13, .42); opacity: 0; transition: opacity .25s, left .3s var(--f-ease), top .3s var(--f-ease), width .3s var(--f-ease), height .3s var(--f-ease); }
.cut-marker.is-visible { opacity: 1; }
.cut-marker::after { content: attr(data-label); position: absolute; left: -2px; bottom: 100%; padding: 3px 8px; background: #fff; color: var(--f-ink); font: 700 11px/1.4 var(--f-sans); white-space: nowrap; }
@media (prefers-reduced-motion: reduce) { .cut-window, .cut-marker { transition: none; } }

/* Shared header ------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 40; display: flex; align-items: center; gap: clamp(14px, 3vw, 40px);
  min-height: 60px; padding: 0 var(--f-gutter); color: var(--f-on-ink);
  background: color-mix(in srgb, var(--f-ink) 95%, transparent); backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--f-line-ink); view-transition-name: site-header;
}
.site-mark { font: 800 22px/1 var(--f-latin); font-stretch: 118%; letter-spacing: -.03em; color: inherit; text-decoration: none; flex: none; }
.site-mark span { color: var(--f-accent); transition: color .4s; }
.site-nav { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.site-nav::-webkit-scrollbar { display: none; }
.site-nav a { position: relative; display: inline-flex; align-items: baseline; gap: 6px; padding: 20px 10px; color: var(--f-on-ink-soft); text-decoration: none; font: 700 13px/1 var(--f-sans); white-space: nowrap; transition: color .2s; }
.site-nav a small { font: 600 9px/1 var(--f-latin); letter-spacing: .1em; opacity: .6; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--f-on-ink); }
.site-nav a::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: 12px; height: 3px; background: var(--f-accent); transform: scaleX(0) skewX(-28deg); transform-origin: left; transition: transform .35s var(--f-ease); }
.site-nav a[aria-current="page"]::after, .site-nav a:hover::after { transform: scaleX(1) skewX(-28deg); }
.site-exit { color: var(--f-on-ink-soft); font: 600 11px/1 var(--f-latin); letter-spacing: .08em; text-decoration: none; white-space: nowrap; }
.site-exit:hover { color: var(--f-on-ink); }
.site-header a:focus-visible, .site-footer a:focus-visible { outline: 2px solid var(--f-on-ink); outline-offset: 3px; }

@media (max-width: 860px) {
  .site-exit { display: none; }
}
@media (max-width: 640px) {
  .site-header { flex-wrap: wrap; gap: 0; padding: 0; min-height: 0; }
  .site-mark { padding: 14px var(--f-gutter) 4px; font-size: 20px; }
  .site-nav { width: 100%; margin: 0; padding: 0 calc(var(--f-gutter) - 10px); mask-image: linear-gradient(90deg, #000 86%, transparent); }
  .site-nav a { padding: 12px 10px 16px; font-size: 12px; }
  .site-nav a::after { bottom: 8px; }
}

/* Shared footer ------------------------------------------------------- */
.site-footer { display: grid; grid-template-columns: auto 1fr auto; gap: 18px 48px; align-items: start; padding: 56px var(--f-gutter) 64px; background: var(--f-ink); color: var(--f-on-ink-soft); border-top: 1px solid var(--f-line-ink); font: 400 12px/1.9 var(--f-sans); }
.site-footer .site-mark { color: var(--f-on-ink); }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 22px; }
.site-footer nav a { color: var(--f-on-ink); text-decoration: none; font-weight: 700; }
.site-footer nav a:hover { text-decoration: underline; text-underline-offset: 5px; }
.site-footer p { margin: 0; grid-column: 2; }
.site-footer .site-checked { grid-column: 3; grid-row: 1 / span 2; font: 600 11px/1.8 var(--f-latin); letter-spacing: .14em; text-align: right; }
@media (max-width: 760px) {
  .site-footer { grid-template-columns: 1fr; }
  .site-footer p, .site-footer .site-checked { grid-column: 1; grid-row: auto; text-align: left; }
}

/* Page-to-page: entering another world is a slash wipe, never a wait. */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: f-world-out .5s var(--f-ease-in) both; }
::view-transition-new(root) { animation: f-world-in .62s var(--f-ease) both; }
::view-transition-group(site-header) { animation-duration: .5s; }
@keyframes f-world-out { to { opacity: .35; transform: translateX(-3%); } }
@keyframes f-world-in {
  from { clip-path: polygon(100% 0, 130% 0, 130% 100%, 112% 100%); }
  to { clip-path: polygon(-30% 0, 130% 0, 130% 100%, -48% 100%); }
}

@media (prefers-reduced-motion: reduce) {
  @view-transition { navigation: none; }
  .site-nav a::after, .site-mark span { transition: none; }
}