/* 僕のたどり着く場所：黄と黒のツートーン。一覧と作品ページで共有する */
:root {
  /* 黄と黒のツートーン。bktsk.com と同じ黄（bktsk-yellow-500）と黒（zinc-900）。
     ほかの色は使わない（濃淡は二色の混ぜ具合で出す） */
  --yellow: #ffff00;
  --black: #18181b;
  --bg: var(--yellow);
  --ink: var(--black);
  --ink-soft: color-mix(in srgb, var(--black) 78%, var(--yellow));
  --rule: var(--black);
  --mincho: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --gothic: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", sans-serif;
  color-scheme: light;
}
/* 暗い表示は反転（黒地に黄）。端末の設定に従い、切り替えボタンで選んだほうが優先 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --bg: var(--black); --ink: var(--yellow); --ink-soft: color-mix(in srgb, var(--yellow) 80%, var(--black)); --rule: var(--yellow); color-scheme: dark; }
}
:root[data-theme="dark"] { --bg: var(--black); --ink: var(--yellow); --ink-soft: color-mix(in srgb, var(--yellow) 80%, var(--black)); --rule: var(--yellow); color-scheme: dark; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.9 var(--gothic);
  font-feature-settings: "palt" 0;
}
a { color: inherit; text-underline-offset: 0.25em; text-decoration-thickness: 1px; }
a:focus-visible, .start:focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; border-radius: 2px; }

.site {
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px 24px 0;
}
.site-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--rule);
}
.site-head .label {
  font: 700 19px/1.3 var(--mincho);
  color: var(--ink);
  letter-spacing: 0.12em;
  margin: 0;
}
.site-head p { margin: 0; color: var(--ink-soft); font-size: 13px; }

/* ---- 作品 ---- */
.work {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  gap: 0 40px;
  padding: 56px 0 64px;
  border-bottom: 2px solid var(--rule);
}
.work-no {
  font: 800 clamp(120px, 17vw, 196px)/0.8 var(--mincho);
  letter-spacing: -0.04em;
  margin: 0;
  color: var(--ink);
}
.work-no small {
  display: block;
  font: 500 13px/1.4 var(--gothic);
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-top: 18px;
}
.work-title {
  writing-mode: vertical-rl;
  font: 700 clamp(34px, 4.2vw, 46px)/1.25 var(--mincho);
  letter-spacing: 0.18em;
  margin: 0;
  padding-top: 4px;
  min-height: 9.6em;
  border-left: 2px solid var(--rule);
  padding-left: 32px;
}
.work-body { max-width: 34em; padding-top: 6px; }
.status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  margin: 0 0 20px;
}
.status::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ink) 18%, transparent);
  animation: lamp 3.2s ease-in-out infinite;
}
@keyframes lamp { 50% { box-shadow: 0 0 0 7px color-mix(in srgb, var(--ink) 4%, transparent); } }
.lead {
  font: 500 19px/2 var(--mincho);
  margin: 0 0 22px;
}
.work-body > p { margin: 0 0 16px; color: var(--ink-soft); }
.facts {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 20px;
  margin: 26px 0 32px;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-size: 14px;
}
.facts dt { color: var(--ink-soft); }
.facts dd { margin: 0; }
.start {
  display: inline-block;
  background: var(--ink);
  color: var(--bg);
  text-decoration: none;
  font: 700 17px/1 var(--gothic);
  padding: 18px 28px;
  border-radius: 3px;
}
.start:hover { box-shadow: 6px 6px 0 color-mix(in srgb, var(--ink) 35%, transparent); }
.start-note { font-size: 13px; color: var(--ink-soft); margin: 12px 0 0; }
.hint {
  margin: 28px 0 0;
  padding: 14px 16px;
  border: 2px solid var(--ink);
  border-radius: 3px;
  font-size: 14px;
}

/* ---- 遊ぶ前に ---- */
.notes {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 24px 40px;
  padding: 48px 0 56px;
  border-bottom: 2px solid var(--rule);
}
.notes h2 {
  font: 700 22px/1.5 var(--mincho);
  margin: 0;
}
.notes ul { list-style: none; margin: 0; padding: 0; max-width: 40em; }
.notes li { padding: 12px 0; border-top: 1px solid var(--rule); }
.notes li:first-child { border-top: 0; padding-top: 0; }
.notes strong { font-weight: 700; }
.changelog time { font-weight: 700; white-space: nowrap; }

.site-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 24px 0 40px;
  font-size: 13px;
  color: var(--ink-soft);
}
.site-foot p { margin: 0; }

@media (max-width: 760px) {
  .site { padding: 20px 16px 0; }
  .site-head { flex-direction: column; gap: 4px; }
  .work { grid-template-columns: auto minmax(0, 1fr); gap: 0 20px; padding: 36px 0 44px; }
  .work-no { font-size: 96px; }
  .work-no small { margin-top: 12px; }
  .work-title { font-size: 30px; min-height: 0; padding-left: 20px; justify-self: start; }
  .work-body { grid-column: 1 / -1; padding-top: 32px; }
  .lead { font-size: 17px; }
  .start { display: block; text-align: center; }
  .notes { grid-template-columns: 1fr; gap: 16px; padding: 36px 0 40px; }
}
@media (prefers-reduced-motion: reduce) { .status::before { animation: none; } }

/* ---- 一覧 ---- */
.label a { text-decoration: none; }
.intro {
  font: 500 19px/2 var(--mincho);
  max-width: 30em;
  margin: 48px 0 40px;
}
.works { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--rule); }
.works li { border-bottom: 2px solid var(--rule); }
.work-row {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr) auto;
  gap: 0 32px;
  align-items: center;
  padding: 32px 0;
  text-decoration: none;
}
.work-row .no { font: 800 96px/0.8 var(--mincho); letter-spacing: -0.04em; }
.row-body { display: block; }
.row-status { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 500; }
.row-status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--ink); }
.work-row h2 { font: 700 32px/1.35 var(--mincho); letter-spacing: 0.1em; margin: 6px 0 6px; }
.row-lead { display: block; color: var(--ink-soft); }
.go {
  font-weight: 700;
  white-space: nowrap;
  border: 2px solid var(--ink);
  border-radius: 3px;
  padding: 12px 18px;
}
.work-row:hover .go { background: var(--ink); color: var(--bg); }
.work-row:focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; }
.works + .notes { border-bottom: 0; }
@media (max-width: 760px) {
  .intro { font-size: 17px; margin: 32px 0 28px; }
  .work-row { grid-template-columns: auto minmax(0, 1fr); gap: 16px 20px; padding: 24px 0; }
  .work-row .no { font-size: 64px; }
  .work-row h2 { font-size: 24px; }
  .go { grid-column: 1 / -1; text-align: center; }
}

/* ---- 明るい・暗いの切り替え ---- */
.head-tools { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; justify-content: flex-end; }
.theme-toggle {
  font: 500 13px/1 var(--gothic);
  color: var(--ink);
  background: transparent;
  border: 2px solid var(--ink);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
}
.theme-toggle:hover { background: var(--ink); color: var(--bg); }
.theme-toggle:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
@media (max-width: 760px) { .head-tools { justify-content: flex-start; } }

/* ---- 文書のページ（ガイドラインなど） ---- */
.doc { max-width: 44em; padding: 48px 0 56px; }
.doc h1 { font: 700 34px/1.4 var(--mincho); letter-spacing: 0.06em; margin: 0 0 20px; }
.doc-lead { font: 500 18px/2 var(--mincho); margin: 0 0 32px; }
.doc section { border-top: 2px solid var(--rule); padding: 24px 0 8px; }
.doc h2 { font: 700 21px/1.5 var(--mincho); margin: 0 0 12px; }
.doc ul { margin: 0; padding-left: 1.2em; }
.doc li { margin: 0 0 10px; }
.doc p { margin: 0 0 14px; }
.doc-note { font-size: 13px; color: var(--ink-soft); border-top: 2px solid var(--rule); padding-top: 20px; }
@media (max-width: 760px) { .doc { padding: 32px 0 40px; } .doc h1 { font-size: 26px; } .doc-lead { font-size: 16px; } }