/* ─────────────────────────────────────────────────────────────────
   Ben Mo — Photographs · 困在手机里的人
   L3 gallery, dark monograph treatment.

   Structure:
     §1  Tokens (paper→ink inverted to read on dark)
     §2  Base canvas, archive container
     §3  Site-anchor dark-mode overrides
     §4  Frontispiece (title block, lede, meta)
     §5  Plate divider
     §6  Photo grid + span variants
     §7  Photo card / wrapper / index chip
     §8  Lightbox v2 (header, body, nav, footer)
     §9  End mark — dark reverse
     §10 Reveal-on-scroll
     §11 Responsive (tablet ≤960, phone ≤640)
   ───────────────────────────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600&display=swap');

/* ── §1. Tokens ─────────────────────────────────────────────────── */
:root {
  /* Dark theme = paper-tone palette inverted.
     The L1 palette is #f1ede2 paper on #26241e ink.  Here we flip
     ratios: warm near-black ground, paper-tone text. */
  --bm-d-bg:        #131110;
  --bm-d-bg-soft:   #0d0c0b;          /* slightly darker for photo backings */
  --bm-d-ink:       #f1ede2;          /* the L1 paper color as text */
  --bm-d-ink-soft:  #c4bfb0;
  --bm-d-ink-muted: #8a8478;
  --bm-d-ink-dim:   #5a554c;
  --bm-d-line:        rgba(241, 237, 226, 0.13);
  --bm-d-line-strong: rgba(241, 237, 226, 0.28);

  --bm-serif: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC',
              'STSong', 'Songti', serif;
}

/* ── §2. Base ────────────────────────────────────────────────────── */
html, body {
  margin: 0;
  padding: 0;
  background: var(--bm-d-bg);
  color: var(--bm-d-ink-soft);
  font-family: var(--bm-mono);
  font-size: 12px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: var(--bm-d-ink); color: var(--bm-d-bg); }

/* Container — echoes the L1/L2 .shell width but with deeper top padding
   to clear the floating breadcrumb anchor. */
.archive {
  max-width: 1240px;
  margin: 0 auto;
  padding: 140px 60px 60px;
}

/* hairline utility, same gesture as styles.css */
.hairline {
  height: 1px;
  background: var(--bm-d-line);
  width: 100%;
}

/* ── §3. Site-anchor dark contrast ──────────────────────────────── */
.site-anchor.on-dark {
  background: rgba(18, 17, 15, 0.82) !important;
  color: rgba(255, 255, 255, 0.88) !important;
  box-shadow: 0 4px 22px rgba(0, 0, 0, 0.55) !important;
}
.site-anchor.on-dark .site-anchor__sep { opacity: 0.5 !important; }
.site-anchor.on-dark .site-anchor__arrow,
.site-anchor.on-dark .site-anchor__home {
  color: var(--bm-d-ink) !important;
}
.site-anchor.on-dark .site-anchor__arrow:hover,
.site-anchor.on-dark .site-anchor__home:hover {
  background: var(--bm-d-ink) !important;
  color: var(--bm-d-bg) !important;
}

/* ── §4. Frontispiece ────────────────────────────────────────────── */
.frontispiece {
  padding-bottom: 100px;
  border-bottom: 1px solid var(--bm-d-line);
}

/* head: kicker + title + rule + subtitle + byline */
.frontispiece__head {
  margin-bottom: 72px;
}

.frontispiece__kicker {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--bm-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bm-d-ink-muted);
}
.frontispiece__kicker .dot {
  color: var(--bm-d-ink-dim);
  letter-spacing: 0;
}

.frontispiece__title {
  font-family: var(--bm-serif);
  font-size: clamp(48px, 7.2vw, 88px);
  line-height: 1.04;
  font-weight: 300;
  color: var(--bm-d-ink);
  letter-spacing: -0.02em;
  margin: 26px 0 0;
  /* Subtle widow control on big titles */
  text-wrap: balance;
}

.frontispiece__rule {
  margin: 36px 0 22px;
  width: 56px;
  height: 1px;
  background: var(--bm-d-line-strong);
}

.frontispiece__subtitle {
  font-family: var(--bm-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--bm-d-ink);
}

.frontispiece__byline {
  margin-top: 14px;
  font-family: var(--bm-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--bm-d-ink-muted);
}

/* main: 2-col body + meta */
.frontispiece__main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 64px;
  align-items: start;
}

.frontispiece__body {
  max-width: 600px;
}

.frontispiece__lede {
  margin: 0;
  font-family: var(--bm-serif);
  font-size: 19px;
  line-height: 1.7;
  font-weight: 400;
  color: var(--bm-d-ink);
  text-wrap: pretty;
  letter-spacing: 0.005em;
}

.frontispiece__intro {
  margin: 26px 0 0;
  font-family: var(--bm-serif);
  font-size: 15.5px;
  line-height: 1.95;
  font-weight: 400;
  color: var(--bm-d-ink-soft);
  text-wrap: pretty;
}

/* meta key-value list — mirrors the L1 .identity block, inverted */
.frontispiece__meta {
  margin: 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--bm-d-line);
  display: grid;
  row-gap: 12px;
  font-family: var(--bm-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
}
.frontispiece__meta > div {
  display: grid;
  grid-template-columns: 78px 1fr;
  align-items: baseline;
  gap: 16px;
}
.frontispiece__meta dt {
  color: var(--bm-d-ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 10.5px;
}
.frontispiece__meta dd {
  margin: 0;
  color: var(--bm-d-ink);
  text-wrap: pretty;
}

/* ── §5. Plate divider ───────────────────────────────────────────── */
.plate-divider {
  display: grid;
  grid-template-columns: 56px auto auto 1fr auto;
  align-items: center;
  gap: 22px;
  margin: 140px 0 80px;
  padding-top: 14px;
}

.plate-divider__numeral {
  font-family: var(--bm-serif);
  font-size: 30px;
  font-weight: 300;
  line-height: 1;
  color: var(--bm-d-ink);
  letter-spacing: 0.08em;
  text-align: center;
  border-right: 1px solid var(--bm-d-line-strong);
  padding-right: 22px;
  margin-right: -22px;
}

.plate-divider__name {
  font-family: var(--bm-serif);
  font-size: 18px;
  font-weight: 400;
  color: var(--bm-d-ink);
  letter-spacing: 0.04em;
}

.plate-divider__english {
  font-family: var(--bm-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--bm-d-ink-muted);
}

.plate-divider__rule {
  height: 1px;
  background: var(--bm-d-line);
}

.plate-divider__range {
  font-family: var(--bm-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--bm-d-ink-muted);
}

/* ── §6. Photo grid + span variants ──────────────────────────────── */

/* The opening section is its own micro-grid: a hero V on the left,
   curatorial epigraph in the right margin. */
.opening {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 96px 36px;
  margin-top: 80px;
}

.opening__epigraph {
  grid-column: 8 / span 5;
  align-self: end;
  padding-bottom: 56px;
}
.opening__epigraph p {
  margin: 0;
  font-family: var(--bm-serif);
  font-style: italic;
  font-size: 17px;
  line-height: 1.85;
  color: var(--bm-d-ink-soft);
  text-wrap: pretty;
  font-weight: 400;
}
.opening__epigraph cite {
  display: block;
  margin-top: 22px;
  font-family: var(--bm-mono);
  font-style: normal;
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bm-d-ink-muted);
}

/* Plate grid */
.plate {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 96px 36px;
}

/* Span variants — left-anchored verticals, center solo, right verticals,
   tight pair (inset gutters), wide pair (full bleed), full, and two
   asymmetric "wide" variants with intentional column gutters. */
.photo-card                { margin: 0; position: relative; }
.photo-card--solo-left     { grid-column: 1 / span 5; }
.photo-card--solo-center   { grid-column: 5 / span 4; }
.photo-card--solo-right    { grid-column: 8 / span 5; }
.photo-card--pair-wide-l   { grid-column: 1 / span 6; }
.photo-card--pair-wide-r   { grid-column: 7 / span 6; }
.photo-card--pair-tight-l  { grid-column: 2 / span 5; }
.photo-card--pair-tight-r  { grid-column: 7 / span 5; }
.photo-card--full          { grid-column: 1 / -1; }
.photo-card--wide-l        { grid-column: 1 / span 10; }   /* 2-col gutter right */
.photo-card--wide-r        { grid-column: 3 / span 10; }   /* 2-col gutter left  */

/* ── §7. Photo wrapper + index chip ──────────────────────────────── */
.photo-wrapper {
  position: relative;
  overflow: hidden;
  background: var(--bm-d-bg-soft);
  box-shadow:
    0 2px 18px rgba(0, 0, 0, 0.50),
    0 22px 80px rgba(0, 0, 0, 0.38);
  cursor: zoom-in;
  transition: transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Inner vignette — gentle, gives photos depth on the dark page */
.photo-wrapper::after {
  content: '';
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 70px rgba(0, 0, 0, 0.30);
  pointer-events: none;
  z-index: 1;
}

/* Corner registration ticks — darkroom L-marks, fading in on hover.
   Eight tile backgrounds: two strokes per corner. The pseudo-element is
   inset 8px from the wrapper, so the marks sit just inside the frame edge. */
.photo-wrapper::before {
  content: '';
  position: absolute;
  inset: 8px;
  pointer-events: none;
  z-index: 2;
  opacity: 0;
  transition: opacity 360ms ease;
  --tick: rgba(241, 237, 226, 0.55);
  background:
    linear-gradient(var(--tick), var(--tick)) top    left  / 12px 1px no-repeat,
    linear-gradient(var(--tick), var(--tick)) top    left  / 1px 12px no-repeat,
    linear-gradient(var(--tick), var(--tick)) top    right / 12px 1px no-repeat,
    linear-gradient(var(--tick), var(--tick)) top    right / 1px 12px no-repeat,
    linear-gradient(var(--tick), var(--tick)) bottom left  / 12px 1px no-repeat,
    linear-gradient(var(--tick), var(--tick)) bottom left  / 1px 12px no-repeat,
    linear-gradient(var(--tick), var(--tick)) bottom right / 12px 1px no-repeat,
    linear-gradient(var(--tick), var(--tick)) bottom right / 1px 12px no-repeat;
}
.photo-wrapper:hover::before { opacity: 1; }

.photo-wrapper:hover {
  transform: translateY(-4px);
}

/* Frame number chip — echoes L2 .work__index exactly */
.photo-index {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 3;
  font-family: var(--bm-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  background: rgba(13, 14, 12, 0.78);
  color: var(--bm-d-ink);
  padding: 3px 7px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.gallery-img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 900ms cubic-bezier(0.16, 1, 0.3, 1);
}
.photo-wrapper:hover .gallery-img {
  transform: scale(1.025);
}

/* ── §8. Lightbox v2 ─────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(8, 7, 6, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 280ms ease;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 28px 40px;
  gap: 16px;
}
.lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

/* header strip */
.lightbox__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.lightbox__file {
  font-family: var(--bm-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bm-d-ink-muted);
}
.lightbox__close {
  width: 36px; height: 36px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--bm-d-line-strong);
  color: var(--bm-d-ink);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: background 200ms, color 200ms, transform 220ms cubic-bezier(.2,.7,.2,1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--bm-mono);
}
.lightbox__close:hover {
  background: var(--bm-d-ink);
  color: var(--bm-d-bg);
}

/* body: image centered, prev/next arrows on sides */
.lightbox__body {
  position: relative;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lightbox__img {
  max-width: calc(100vw - 200px);
  max-height: calc(100vh - 210px);
  object-fit: contain;
  display: block;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.85);
  opacity: 0;
  transform: scale(0.985);
  transition: opacity 280ms ease, transform 380ms cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.lightbox.is-loaded .lightbox__img {
  opacity: 1;
  transform: scale(1);
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 999px;
  background: rgba(241, 237, 226, 0.04);
  border: 1px solid var(--bm-d-line-strong);
  color: var(--bm-d-ink);
  font-family: var(--bm-serif);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: background 220ms, color 220ms, border-color 220ms, transform 240ms cubic-bezier(.2,.7,.2,1);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2010;
}
.lightbox__nav--prev { left: 36px; }
.lightbox__nav--next { right: 36px; }
.lightbox__nav:hover:not(:disabled) {
  background: var(--bm-d-ink);
  color: var(--bm-d-bg);
  border-color: var(--bm-d-ink);
}
.lightbox__nav--prev:hover:not(:disabled) { transform: translateY(-50%) translateX(-3px); }
.lightbox__nav--next:hover:not(:disabled) { transform: translateY(-50%) translateX(3px); }
.lightbox__nav:disabled {
  opacity: 0.22;
  cursor: not-allowed;
}

/* footer: counter + plate + hint */
.lightbox__footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}
.lightbox__counter {
  font-family: var(--bm-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.32em;
  color: var(--bm-d-ink);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}
.lightbox__counter::before,
.lightbox__counter::after {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--bm-d-line-strong);
}
.lightbox__plate {
  font-family: var(--bm-serif);
  font-size: 13px;
  color: var(--bm-d-ink-soft);
  letter-spacing: 0.06em;
  text-align: center;
  grid-column: 2;
  grid-row: 2;
  margin-top: 4px;
}
.lightbox__hint {
  font-family: var(--bm-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bm-d-ink-dim);
  text-align: right;
}
.lightbox__hint--left {
  text-align: left;
}

/* ── §9. End mark (dark reverse) ─────────────────────────────────── */
.end-mark {
  max-width: 1240px;
  margin: 100px auto 0;
  padding: 28px 60px 40px;
  color: var(--bm-d-ink-muted) !important;
  border-top: 1px solid var(--bm-d-line) !important;
}
.end-mark a {
  color: var(--bm-d-ink-soft) !important;
  border-bottom-color: var(--bm-d-line-strong) !important;
}
.end-mark a:hover {
  color: var(--bm-d-ink) !important;
  border-bottom-color: var(--bm-d-ink) !important;
}

/* ── §10. Reveal on scroll ───────────────────────────────────────── */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 900ms cubic-bezier(0.16, 1, 0.3, 1),
    transform 900ms cubic-bezier(0.16, 1, 0.3, 1);
}
.js .reveal.is-revealed {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ── §11. Responsive ─────────────────────────────────────────────── */
@media (max-width: 960px) {
  .archive { padding: 110px 36px 48px; }
  .end-mark { padding: 24px 36px 32px; }

  .frontispiece { padding-bottom: 72px; }
  .frontispiece__head { margin-bottom: 56px; }
  .frontispiece__title { font-size: clamp(40px, 8vw, 64px); }
  .frontispiece__main {
    grid-template-columns: 1fr;
    gap: 44px;
  }
  .frontispiece__meta {
    border-top: 1px solid var(--bm-d-line);
    padding-top: 22px;
  }

  /* opening: epigraph stacks under the photo */
  .opening {
    gap: 48px 24px;
    margin-top: 64px;
  }
  .opening .photo-card--solo-left { grid-column: 1 / span 7; }
  .opening__epigraph {
    grid-column: 1 / -1;
    padding: 0;
    align-self: start;
  }

  .plate { gap: 72px 24px; }
  .plate-divider {
    margin: 100px 0 56px;
    grid-template-columns: 48px auto auto 1fr auto;
    gap: 16px;
  }
  .plate-divider__numeral { font-size: 26px; padding-right: 16px; margin-right: -16px; }
  .plate-divider__name { font-size: 16px; }

  /* Collapse asymmetric H variants to full bleed.
     Keep V solo + V pairs but with looser containment. */
  .photo-card--solo-left   { grid-column: 1 / span 8; }
  .photo-card--solo-center { grid-column: 3 / span 8; }
  .photo-card--solo-right  { grid-column: 5 / span 8; }
  .photo-card--pair-wide-l  { grid-column: 1 / span 6; }
  .photo-card--pair-wide-r  { grid-column: 7 / span 6; }
  .photo-card--pair-tight-l { grid-column: 1 / span 6; }
  .photo-card--pair-tight-r { grid-column: 7 / span 6; }
  .photo-card--wide-l       { grid-column: 1 / -1; }
  .photo-card--wide-r       { grid-column: 1 / -1; }
  .photo-card--full         { grid-column: 1 / -1; }

  .lightbox { padding: 22px 24px; }
  .lightbox__nav { width: 44px; height: 44px; font-size: 17px; }
  .lightbox__nav--prev { left: 16px; }
  .lightbox__nav--next { right: 16px; }
  .lightbox__img {
    max-width: calc(100vw - 130px);
    max-height: calc(100vh - 200px);
  }
  .lightbox__hint { display: none; }
  .lightbox__footer { grid-template-columns: 1fr; gap: 6px; text-align: center; }
  .lightbox__plate { grid-column: 1; grid-row: 2; }
}

@media (max-width: 640px) {
  .archive { padding: 96px 22px 36px; }
  .end-mark { padding: 22px 22px 28px; }

  .frontispiece { padding-bottom: 56px; }
  .frontispiece__head { margin-bottom: 40px; }
  .frontispiece__kicker { font-size: 10px; letter-spacing: 0.18em; gap: 10px; }
  .frontispiece__title { font-size: clamp(34px, 10vw, 44px); }
  .frontispiece__rule { margin: 26px 0 16px; width: 44px; }
  .frontispiece__subtitle { font-size: 11px; letter-spacing: 0.26em; }
  .frontispiece__lede { font-size: 16.5px; line-height: 1.7; }
  .frontispiece__intro { font-size: 14.5px; line-height: 1.9; }
  .frontispiece__meta > div { grid-template-columns: 64px 1fr; gap: 12px; }

  .plate-divider {
    grid-template-columns: auto auto 1fr auto;
    gap: 14px;
    margin: 72px 0 44px;
  }
  .plate-divider__numeral {
    font-size: 22px;
    padding-right: 12px;
    margin-right: 0;
  }
  .plate-divider__english { display: none; }

  /* On phone, every card spans full width. */
  .photo-card,
  .photo-card--solo-left,
  .photo-card--solo-center,
  .photo-card--solo-right,
  .photo-card--pair-wide-l,
  .photo-card--pair-wide-r,
  .photo-card--pair-tight-l,
  .photo-card--pair-tight-r,
  .photo-card--full,
  .photo-card--wide-l,
  .photo-card--wide-r {
    grid-column: 1 / -1;
  }
  .opening { gap: 32px 0; margin-top: 48px; }
  .opening .photo-card--solo-left { grid-column: 1 / -1; }
  .opening__epigraph p { font-size: 15.5px; line-height: 1.8; }
  .plate { gap: 56px 0; }

  .photo-index { font-size: 9.5px; padding: 2px 6px; top: 8px; left: 8px; }

  .lightbox { padding: 14px 12px; gap: 10px; }
  .lightbox__file { font-size: 9.5px; letter-spacing: 0.14em; }
  .lightbox__nav { width: 38px; height: 38px; font-size: 16px; }
  .lightbox__nav--prev { left: 8px; }
  .lightbox__nav--next { right: 8px; }
  .lightbox__img {
    max-width: calc(100vw - 90px);
    max-height: calc(100vh - 170px);
  }
  .lightbox__counter { font-size: 10.5px; letter-spacing: 0.24em; gap: 10px; }
  .lightbox__counter::before,
  .lightbox__counter::after { width: 18px; }
  .lightbox__plate { font-size: 12px; }
}