/* Archive ledger — white / cool grey, graphite, blue ink, red stamp accent. */
:root {
  --paper: #ffffff;
  --grey: #f2f4f7;
  --rule: #d3d8e0;
  --rule-strong: #9aa3b2;
  --ink: #23272e;
  --ink-soft: #5b6472;
  --blue: #1d3f95;
  --red: #b3261e;
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", serif;
  --wrap: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  letter-spacing: 0;
}

[hidden] { display: none !important; }

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

a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 0.15em; }
a:hover { color: var(--ink); }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }

h1, h2, h3 { margin: 0; font-weight: 600; line-height: 1.25; letter-spacing: 0; }
p, ol, ul, dl { margin: 0; }
ol, ul { padding: 0; list-style: none; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Masthead ---------- */
.mast { border-bottom: 1px solid var(--ink); background: var(--paper); }
.mast__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.5rem;
  min-height: 3.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.mast__brand { display: inline-flex; align-items: center; gap: 0.75rem; color: var(--ink); text-decoration: none; padding: 0.4rem 0; }
.mast__logo { display: block; background: var(--ink); padding: 0.2rem 0.35rem; border-radius: 2px; }
.mast__logo img { width: auto; height: 1.5rem; }
.mast__name { font-weight: 600; font-size: 1rem; }
.mast__toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}
.mast__nav { margin-left: auto; }
.mast__list { display: flex; flex-wrap: wrap; gap: 0 1.25rem; }
.mast__list a { display: inline-block; padding: 0.85rem 0; color: var(--ink); text-decoration: none; border-bottom: 2px solid transparent; }
.mast__list a:hover { color: var(--blue); }
.mast__list a[aria-current="page"] { color: var(--blue); border-bottom-color: var(--blue); }

/* ---------- Page heads ---------- */
.ledger-head { padding: 1.75rem 0 1rem; }
.ledger-head__title { font-size: 1.75rem; }
.ledger-head__desc { margin-top: 0.35rem; max-width: 46rem; color: var(--ink-soft); }

/* ---------- Index band ---------- */
.index-band {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  background: var(--grey);
  margin: 0 -1.5rem;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}
.index-band__meta { display: flex; gap: 1rem; font-size: 0.85rem; color: var(--ink-soft); white-space: nowrap; }
.index-band__letters { display: flex; flex-wrap: wrap; gap: 0.15rem; font-family: var(--serif); font-size: 1rem; }
.index-band__letters li { min-width: 1.7rem; text-align: center; }
.index-band__letters a { display: block; padding: 0.1rem 0.25rem; color: var(--blue); text-decoration: none; border-bottom: 2px solid var(--blue); }
.index-band__letters a:hover { background: var(--paper); }
.index-band__letters span { display: block; padding: 0.1rem 0.25rem; color: var(--rule-strong); }
.index-band__links { display: flex; gap: 1.25rem; margin-left: auto; font-size: 0.9rem; }
.index-band__links a, .index-band__cats a { display: inline-flex; align-items: center; gap: 0.25rem; text-decoration: none; }
.index-band__cats { display: flex; flex-wrap: wrap; gap: 0.35rem 1.25rem; font-size: 0.9rem; }
.index-band__cats span { color: var(--ink-soft); font-size: 0.8rem; }
.index-band__cats span::before { content: "("; }
.index-band__cats span::after { content: ")"; }

/* ---------- Homepage ledger (two columns, vertical rule) ---------- */
.ledger { padding: 1.5rem 0 2rem; column-count: 2; column-gap: 3rem; column-rule: 1px solid var(--rule); }
.ledger__group { margin-bottom: 1.5rem; }
.ledger__letter {
  break-after: avoid;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 2.25rem;
  line-height: 1;
  color: var(--blue);
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 0.25rem;
}
.ledger__list li { break-inside: avoid; }

/* Compact entry shared by homepage, category page, featured list */
.entry { display: grid; grid-template-columns: 80px 1fr; gap: 0.85rem; padding: 0.7rem 0; border-bottom: 1px solid var(--rule); }
.entry__cover { display: block; width: 80px; height: 60px; background: var(--grey); border: 1px solid var(--rule); border-radius: 2px; overflow: hidden; }
.entry__cover img { width: 100%; height: 100%; object-fit: contain; }
.entry__body { min-width: 0; }
.entry__name { font-size: 1.05rem; }
.entry__name a { color: var(--ink); text-decoration: none; }
.entry__name a:hover { color: var(--blue); text-decoration: underline; }
.entry__en { font-family: var(--serif); font-size: 0.9rem; color: var(--ink-soft); overflow-wrap: anywhere; }
.entry__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.85rem; margin-top: 0.3rem; font-size: 0.82rem; }
.entry__meta a:first-child { color: var(--ink-soft); text-decoration: none; }
.entry__meta a:first-child:hover { color: var(--blue); }

/* Red stamp-like action */
.stamp {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border: 1.5px solid var(--red);
  border-radius: 2px;
  color: var(--red);
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  background: var(--paper);
}
.stamp:hover { background: var(--red); color: #fff; }
.stamp--small { padding: 0.05rem 0.4rem; font-size: 0.75rem; border-width: 1px; }

/* Homepage shelves */
.shelf { border-top: 1px solid var(--ink); padding: 1.25rem 0 2rem; }
.shelf__title { font-size: 1.15rem; margin-bottom: 0.5rem; }
.shelf__list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); column-gap: 3rem; }
.shelf__more { margin-top: 0.85rem; font-size: 0.9rem; }
.shelf__more a { display: inline-flex; align-items: center; gap: 0.25rem; text-decoration: none; }
.catlist { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); column-gap: 3rem; }
.catlist__item { display: flex; align-items: baseline; gap: 0.75rem; padding: 0.55rem 0; border-bottom: 1px solid var(--rule); }
.catlist__label { color: var(--ink); text-decoration: none; font-weight: 600; }
.catlist__label:hover { color: var(--blue); }
.catlist__count { color: var(--ink-soft); font-size: 0.85rem; }
.catlist__filter { margin-left: auto; font-size: 0.85rem; }

/* ---------- Games finder ---------- */
.finder {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  padding: 0.75rem 1.5rem;
  margin: 0 -1.5rem;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  background: var(--grey);
}
.finder__search, .finder__filter { display: flex; align-items: center; gap: 0.5rem; }
.finder__search { flex: 1 1 18rem; min-width: 0; }
.finder__label { font-size: 0.85rem; color: var(--ink-soft); white-space: nowrap; }
.finder__search svg { color: var(--ink-soft); }
.finder input, .finder select {
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.35rem 0.6rem;
  min-height: 2.25rem;
}
.finder input { flex: 1; min-width: 0; width: 100%; }
.finder select { appearance: none; padding-right: 1.9rem; max-width: 100%; }
.finder__filter { position: relative; }
.finder__filter svg { position: absolute; right: 0.55rem; pointer-events: none; color: var(--ink-soft); }
.finder__count { font-size: 0.9rem; white-space: nowrap; }
.finder__count output { font-weight: 600; color: var(--blue); }
.finder__reset {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font: inherit;
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}
.finder__reset:hover { border-color: var(--ink); }
.finder__empty { padding: 1.25rem 0; color: var(--ink-soft); border-bottom: 1px solid var(--rule); }

/* ---------- Games records (two columns, vertical rule) ---------- */
.records { position: relative; display: grid; grid-template-columns: 1fr 1fr; column-gap: 3rem; padding: 0.5rem 0 2rem; align-items: start; }
.records::before { content: ""; position: absolute; top: 0.5rem; bottom: 2rem; left: 50%; width: 1px; background: var(--rule); }
.record { display: grid; grid-template-columns: 112px 1fr; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--rule); min-width: 0; }
.record:target { background: var(--grey); box-shadow: 0 0 0 0.75rem var(--grey); }
.record__cover { width: 112px; height: 84px; background: var(--grey); border: 1px solid var(--rule); border-radius: 2px; overflow: hidden; }
.record__cover img { width: 100%; height: 100%; object-fit: contain; }
.record__body { min-width: 0; }
.record__name { font-size: 1.15rem; }
.record__en { font-family: var(--serif); font-size: 0.95rem; color: var(--ink-soft); overflow-wrap: anywhere; }
.record__facts { display: flex; flex-wrap: wrap; gap: 0.2rem 1.25rem; margin-top: 0.4rem; font-size: 0.82rem; }
.record__facts div { display: flex; gap: 0.4rem; }
.record__facts dt { color: var(--ink-soft); }
.record__facts dt::after { content: "："; }
.record__facts dd { margin: 0; }
.record__desc { margin-top: 0.5rem; font-size: 0.92rem; color: var(--ink); overflow-wrap: anywhere; }
.record__action { margin-top: 0.7rem; }

/* ---------- Category groups ---------- */
.catgroup { padding: 1.5rem 0 1rem; }
.catgroup__head { display: grid; grid-template-columns: 4.5rem 1fr; grid-template-rows: auto auto; column-gap: 1rem; align-items: baseline; border-bottom: 1px solid var(--ink); padding-bottom: 0.5rem; }
.catgroup__num { grid-row: 1 / span 2; font-family: var(--serif); font-size: 2.75rem; line-height: 1; color: var(--blue); align-self: start; }
.catgroup__title { font-size: 1.35rem; }
.catgroup__meta { font-size: 0.88rem; color: var(--ink-soft); }
.catgroup__meta a { display: inline-flex; align-items: center; gap: 0.25rem; text-decoration: none; }
.catgroup__list { position: relative; display: grid; grid-template-columns: 1fr 1fr; column-gap: 3rem; align-items: start; }
.catgroup__list::before { content: ""; position: absolute; top: 0; bottom: 0; left: 50%; width: 1px; background: var(--rule); }

/* ---------- Supporting pages (folio) ---------- */
.folio { padding-bottom: 3rem; }
.folio__head { padding: 2rem 0 1.25rem; border-bottom: 1px solid var(--ink); max-width: 46rem; }
.folio__kicker { font-size: 0.85rem; color: var(--ink-soft); }
.folio__title { font-size: 2rem; margin-top: 0.25rem; }
.folio__desc { margin-top: 0.5rem; color: var(--ink-soft); }
.folio__body { max-width: 40rem; margin-left: 6rem; padding-top: 1rem; font-size: 1.02rem; line-height: 1.75; }
.folio__h2 { position: relative; font-size: 1.35rem; margin-top: 2.25rem; padding-top: 0.5rem; border-top: 1px solid var(--rule); }
.folio__h2:first-child { margin-top: 1rem; }
.folio__num { position: absolute; right: calc(100% + 1rem); top: 0.25rem; width: 5rem; text-align: right; font-family: var(--serif); font-weight: 400; font-size: 2.5rem; line-height: 1; color: var(--blue); }
.folio__h3 { font-size: 1.1rem; margin-top: 1.5rem; }
.folio__p { margin-top: 0.85rem; }
.folio__list { margin-top: 0.85rem; padding-left: 1.4rem; }
.folio__list li { margin-top: 0.35rem; }
ol.folio__list { list-style: decimal; }
ul.folio__list { list-style: disc; }
.folio code { font-family: Consolas, "Courier New", monospace; font-size: 0.92em; background: var(--grey); padding: 0.05em 0.35em; border-radius: 2px; }
.folio__next { display: flex; gap: 1.5rem; margin: 2.5rem 0 0 6rem; padding-top: 1rem; border-top: 1px solid var(--ink); max-width: 40rem; font-size: 0.95rem; }
.folio__next a { display: inline-flex; align-items: center; gap: 0.25rem; text-decoration: none; }

/* ---------- Footer ---------- */
.colophon { border-top: 1px solid var(--ink); background: var(--grey); font-size: 0.88rem; color: var(--ink-soft); }
.colophon__inner { max-width: var(--wrap); margin: 0 auto; padding: 1.25rem 1.5rem; display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem 1.5rem; }
.colophon__name { font-weight: 600; color: var(--ink); }
.colophon__links { display: flex; flex-wrap: wrap; gap: 0 1rem; margin-left: auto; }
.colophon__links a { text-decoration: none; }

/* ---------- Retrieval slip (download check shell) ---------- */
.slip {
  width: min(680px, calc(100vw - 2rem));
  max-width: none;
  max-height: calc(100vh - 2rem);
  max-height: calc(100dvh - 2rem);
  padding: 0;
  border: 1px solid var(--ink);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink);
  overflow: hidden;
}
/* Belt and braces: browsers without <dialog> must not print the slip inline. */
.slip:not([open]) { display: none; }
.slip::backdrop { background: rgba(35, 39, 46, 0.55); }
.slip[open] { animation: slip-in 150ms ease-out; }
@keyframes slip-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.slip__card { display: flex; flex-direction: column; max-height: calc(100vh - 2rem); max-height: calc(100dvh - 2rem); overflow-y: auto; }
.slip__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 0.5rem 1rem;
  padding: 0.8rem 1.25rem;
  border-bottom: 1px solid var(--ink);
  background: var(--grey);
}
.slip__kicker { font-size: 0.8rem; color: var(--ink-soft); }
.slip__title { font-size: 1.15rem; }
.slip__stamp {
  font-family: var(--serif);
  font-size: 0.75rem;
  line-height: 1.2;
  color: var(--red);
  border: 1.5px solid var(--red);
  border-radius: 2px;
  padding: 0.15rem 0.4rem;
  transform: rotate(-4deg);
}
.slip__dismiss { display: flex; }
.slip__close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  cursor: pointer;
}
.slip__close:hover { border-color: var(--red); color: var(--red); }

.slip__ledger { padding: 0.75rem 1.25rem 0; font-size: 0.85rem; }
.slip__row {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.3rem 0;
  border-bottom: 1px dotted var(--rule);
}
.slip__row dt { color: var(--ink-soft); }
.slip__row dd { margin: 0; overflow-wrap: anywhere; }
.slip__code { font-family: var(--serif); }
.slip__state[data-state="idle"] { color: var(--ink-soft); }
.slip__state[data-state="loading"], .slip__state[data-state="ready"] { color: var(--blue); }
.slip__state[data-state="error"], .slip__state[data-state="invalid"] { color: var(--red); }

.slip__note { padding: 0.7rem 1.25rem 0; font-size: 0.85rem; color: var(--ink-soft); }
.slip__frame {
  margin: 0.75rem 1.25rem 0;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--grey);
  overflow: hidden;
}
.slip__iframe { display: block; width: 100%; height: 260px; border: 0; background: var(--paper); }
.slip__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  padding: 0.6rem 1.25rem 1rem;
}
.slip__status { flex: 1 1 14rem; min-width: 0; font-size: 0.85rem; color: var(--ink-soft); }
.slip__status[data-state="error"], .slip__status[data-state="invalid"] { color: var(--red); }
.slip__retry {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font: inherit;
  font-size: 0.85rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
}
.slip__retry:hover { border-color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .wrap, .mast__inner, .colophon__inner { padding-left: 1rem; padding-right: 1rem; }
  .index-band, .finder { margin: 0 -1rem; padding-left: 1rem; padding-right: 1rem; }
  .mast__toggle { display: inline-flex; }
  .mast__nav { flex-basis: 100%; margin-left: 0; }
  .js .mast__nav:not(.is-open) { display: none; }
  .mast__list { flex-direction: column; gap: 0; border-top: 1px solid var(--rule); padding: 0.25rem 0 0.5rem; }
  .mast__list a { padding: 0.55rem 0; border-bottom: none; }
  .mast__list a[aria-current="page"] { border-bottom: none; text-decoration: underline; }
  .ledger { column-count: 1; }
  .records, .catgroup__list, .shelf__list, .catlist { grid-template-columns: 1fr; }
  .records::before, .catgroup__list::before { display: none; }
  .index-band__links { margin-left: 0; }
  .folio__body, .folio__next { margin-left: 0; }
  .folio__num { position: static; display: block; width: auto; text-align: left; font-size: 1.75rem; margin-bottom: 0.25rem; }
  .ledger-head__title, .folio__title { font-size: 1.5rem; }
  .slip { width: calc(100vw - 1.5rem); }
  .slip__head { grid-template-columns: minmax(0, 1fr) auto; padding-left: 1rem; padding-right: 1rem; }
  .slip__stamp { grid-row: 2; justify-self: start; }
  .slip__dismiss { grid-row: 1; grid-column: 2; align-self: start; }
  .slip__ledger, .slip__note, .slip__foot { padding-left: 1rem; padding-right: 1rem; }
  .slip__frame { margin-left: 1rem; margin-right: 1rem; }
  .slip__iframe { height: 300px; }
}

@media (max-width: 420px) {
  .record { grid-template-columns: 88px 1fr; gap: 0.75rem; }
  .record__cover { width: 88px; height: 66px; }
  .entry { grid-template-columns: 64px 1fr; gap: 0.65rem; }
  .entry__cover { width: 64px; height: 48px; }
  .catgroup__head { grid-template-columns: 3.25rem 1fr; }
  .catgroup__num { font-size: 2rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
  .slip[open] { animation: none !important; }
}