@import url('https://fonts.googleapis.com/css2?family=Archivo:ital,wght@0,400;0,500;0,700;0,900;1,400&family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;1,6..72,400;1,6..72,500&family=IBM+Plex+Mono:wght@400;500;600&family=Noto+Sans+JP:wght@700;900&display=swap');

/* ============================================
   本 (HON) — DESIGN TOKENS
   ============================================ */
:root {
  --ink: #0a0a0a;
  --paper: #faf9f4;
  --paper-dim: #f0ede2;
  --red: #c8102e;
  --grey: #6e6a61;
  --grey-light: #a8a397;
  --line: rgba(10,10,10,0.14);
  --line-strong: rgba(10,10,10,0.9);

  --display: 'Archivo', Helvetica, Arial, sans-serif;
  --serif: 'Newsreader', Georgia, serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;

  --gutter: clamp(20px, 5vw, 64px);
  --maxw: 1320px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 0.94;
  margin: 0;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey);
  display: flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 1px;
  background: var(--red);
  display: inline-block;
}

.serif-lede {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.45;
  color: #232220;
}

.mono-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.asterisk {
  color: var(--red);
}

/* ---------- Nav: black circle + fullscreen overlay ---------- */
.menu-btn {
  position: fixed;
  top: 22px;
  left: 22px;
  z-index: 300;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.menu-btn .dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  transition: transform 0.2s;
}
.menu-btn .close-x {
  display: none;
  font-family: var(--display);
  font-size: 26px;
  line-height: 1;
  color: var(--ink);
  font-weight: 400;
}
.menu-btn:hover .dot { transform: scale(1.25); }
.menu-btn.open .dot { display: none; }
.menu-btn.open .close-x { display: block; }

.menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 250;
  background: var(--paper);
  transform: translateY(-100%);
  transition: transform 0.55s cubic-bezier(.6,0,.15,1);
  overflow-y: auto;
  padding: 100px var(--gutter) 60px;
}
.menu-overlay.open { transform: translateY(0); }
.overlay-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.overlay-links a {
  display: block;
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--grey-light);
  text-decoration: none;
  transition: color 0.15s;
}
.overlay-links a:hover,
.overlay-links a[aria-current="page"] {
  color: var(--ink);
}
.overlay-links a[aria-current="page"]::after {
  content: ' *';
  color: var(--red);
}
.overlay-meta {
  margin-top: 60px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--grey);
  max-width: 40ch;
}
body.menu-locked { overflow: hidden; }

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn-solid {
  background: var(--ink);
  color: var(--paper);
}
.btn-solid:hover { background: var(--red); border-color: var(--red); }
.btn-red { border-color: var(--red); color: var(--red); }
.btn-red:hover { background: var(--red); color: var(--paper); }
.btn:disabled, .btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
  background: transparent !important;
  color: var(--ink) !important;
}

/* ---------- Section rhythm ---------- */
section { padding: clamp(48px, 8vw, 96px) 0; }
.rule {
  border: none;
  border-top: 2px solid var(--ink);
  margin: 0;
}
.rule-thin {
  border: none;
  border-top: 1px solid var(--line);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 2px solid var(--ink);
  padding: 40px 0 28px;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-grid h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--grey);
  margin-bottom: 14px;
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a { text-decoration: none; font-size: 14.5px; }
.footer-grid a:hover { color: var(--red); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--grey);
  letter-spacing: 0.04em;
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}

/* ---------- Stamp component (shared signature element) ---------- */
.stamp {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 2px solid currentColor;
  padding: 5px 10px;
  display: inline-block;
  transform: rotate(-4deg);
  border-radius: 2px;
}
.stamp-available { color: #1c6b3f; }
.stamp-checked   { color: var(--red); }
.stamp-yours     { color: #1a4fa0; }

/* ---------- Archive: filter bar ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 8px;
  position: relative;
  z-index: 5;
}
.filter-chip {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--line-strong);
  padding: 8px 14px;
  cursor: pointer;
  color: var(--ink);
}
.filter-chip.active { background: var(--ink); color: var(--paper); }
.filter-chip:hover:not(.active) { border-color: var(--red); color: var(--red); }

.catalog-stats { color: var(--grey); }

/* ---------- Archive: scattered floating shelf ---------- */
.shelf {
  position: relative;
  width: 100%;
}
.shelf-item {
  position: absolute;
  text-decoration: none;
  color: inherit;
  display: block;
  cursor: pointer;
}
.shelf-item.is-hidden { display: none; }

.shelf-cover {
  aspect-ratio: 3 / 4;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 7% 8%;
  position: relative;
  overflow: hidden;
  transition: transform 0.45s cubic-bezier(.2,.7,.3,1), box-shadow 0.45s;
  box-shadow: 0 0 0 rgba(0,0,0,0);
}
.shelf-cover::after {
  content: '*';
  position: absolute;
  right: 6%;
  bottom: -4%;
  font-family: var(--display);
  font-size: 30%;
  opacity: 0.08;
  line-height: 1;
}
.shelf-item:hover {
  z-index: 20;
}
.shelf-item:hover .shelf-cover {
  transform: scale(1.16) rotate(-7deg) translateY(-14px);
  box-shadow: 0 34px 60px rgba(10,10,10,0.24);
}
.shelf-cover-era { letter-spacing: 0.12em; font-size: 11px; }
.shelf-cover-title {
  font-family: var(--display);
  font-weight: 900;
  font-size: 150%;
  line-height: 0.98;
  text-transform: uppercase;
}
.shelf-cover-sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: 62%;
  margin-top: 2%;
}
.shelf-cover-issue { letter-spacing: 0.1em; font-size: 11px; }

.shelf-cover-photo {
  padding: 0;
  border: 2px solid;
  background: var(--paper);
}
.shelf-cover-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.shelf-cover-photo-tag {
  position: absolute;
  top: 6%;
  left: 6%;
  padding: 3px 8px;
  font-size: 10px;
  letter-spacing: 0.1em;
}
.shelf-cover-photo::after { display: none; }

.shelf-caption {
  margin-top: 14px;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.25s, transform 0.25s;
}
.shelf-item:hover .shelf-caption {
  opacity: 1;
  transform: translateY(0);
}
.shelf-caption-title {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.shelf-caption-status {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  margin-top: 3px;
}

@media (max-width: 760px) {
  .shelf { height: auto !important; }
  .shelf-item {
    position: static !important;
    width: 78% !important;
    margin: 0 auto 64px;
  }
  .shelf-caption { opacity: 1; transform: none; }
}

/* ---------- Item detail page ---------- */
body.item-page { position: relative; }
#item-bg-pattern {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: grid;
  overflow: hidden;
  pointer-events: none;
}
#item-bg-pattern span {
  font-family: 'Noto Sans JP', var(--display), sans-serif;
  font-weight: 900;
  color: #e3e0d5;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(28px, 4.5vw, 64px);
  user-select: none;
}
.item-page main, .item-page footer { position: relative; z-index: 2; }

.item-hero {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 860px) {
  .item-hero { grid-template-columns: 1fr; }
}

.item-media { position: relative; }
.item-cover-large {
  aspect-ratio: 3 / 4;
  width: 100%;
  padding: 8%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 60px rgba(10,10,10,0.14);
}
.item-cover-large::after {
  content: '*';
  position: absolute;
  right: 5%;
  bottom: -6%;
  font-family: var(--display);
  font-size: 220px;
  opacity: 0.08;
  line-height: 1;
}
.item-cover-title {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 0.98;
  text-transform: uppercase;
}
.item-cover-sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  margin-top: 6px;
}
.item-cover-large-photo {
  padding: 0;
  border: 3px solid;
  background: var(--paper);
}
.item-cover-large-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.item-cover-large-photo::after { display: none; }
.item-cover-photo-tag {
  position: absolute;
  bottom: 5%;
  left: 5%;
  padding: 5px 12px;
  font-size: 11px;
  letter-spacing: 0.1em;
}

.item-dots {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 18px;
}
.item-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line-strong);
  border: none;
  padding: 0;
  cursor: pointer;
  opacity: 0.35;
}
.item-dot.active { opacity: 1; background: var(--ink); }

.item-info { background: var(--paper); padding: 4px 4px 4px 4px; }
.item-title-block {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.08;
  text-transform: uppercase;
}
.item-title-block .div-slash { color: var(--grey-light); margin: 0 6px; }
.item-subline {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--grey);
  margin-top: 14px;
}
.item-callnumber {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(20px, 2.2vw, 26px);
  margin-top: 20px;
  color: var(--red);
}
.item-spec-list {
  margin-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.item-spec-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14.5px;
}
.item-spec-swatch {
  width: 15px;
  height: 15px;
  border: 2px solid var(--ink);
  flex-shrink: 0;
}
.item-spec-swatch.filled { background: var(--ink); }
.item-spec-swatch.filled-red { background: var(--red); border-color: var(--red); }

.item-cta {
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(26px, 3vw, 34px);
  text-transform: uppercase;
  background: none;
  border: none;
  padding: 0;
  margin-top: 30px;
  cursor: pointer;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.item-cta:hover { color: var(--red); }
.item-cta:disabled { color: var(--grey-light); cursor: not-allowed; }

.item-disclosure { margin-top: 28px; }
.item-disclosure summary {
  font-family: var(--display);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.item-disclosure summary::-webkit-details-marker { display: none; }
.item-disclosure summary::before {
  content: '▶';
  font-size: 9px;
  transition: transform 0.2s;
}
.item-disclosure[open] summary::before { transform: rotate(90deg); }
.item-disclosure-body {
  margin-top: 12px;
  font-size: 14px;
  color: #2c2b28;
  max-width: 52ch;
}
.item-back-link {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--grey);
  display: inline-flex;
  gap: 8px;
  margin-top: 40px;
}
.item-back-link:hover { color: var(--red); }
.back-link {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--grey);
  display: inline-flex;
  gap: 8px;
}
.back-link:hover { color: var(--red); }

/* ---------- Utility ---------- */
.tac { text-align: center; }
.mono { font-family: var(--mono); }