:root {
  --paper: #e6e7e1;
  --sheet: #fbfbf8;
  --ink: #1e2320;
  --ink-2: #5c635c;
  --rule: #cbccc3;
  --accent: #2f5d50;
  --accent-soft: #dfe7e2;

  --measure: 34rem;

  --font-display: "Zen Old Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-body: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    "Meiryo", system-ui, sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  font-feature-settings: "palt";
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- 骨組み ------------------------------------------------------ */

.shell {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 1.75rem 0 1.5rem;
}

.masthead__name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ink);
}

.masthead__nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.875rem;
}

.sheet {
  background: var(--sheet);
  border: 1px solid var(--rule);
  padding: 3rem 2.5rem;
}

.colophon {
  padding: 2rem 0 3.5rem;
  color: var(--ink-2);
  font-size: 0.8125rem;
  line-height: 2;
}

.colophon__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin: 0 0 0.75rem;
  padding: 0;
  list-style: none;
}

/* --- 文字 -------------------------------------------------------- */

.title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.9375rem;
  line-height: 1.45;
  letter-spacing: 0.01em;
  margin: 0 0 0.5rem;
}

.lede {
  max-width: var(--measure);
  color: var(--ink-2);
  margin: 0 0 2.5rem;
}

.section-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 3rem 0 1.25rem;
}

.sheet > .section-name:first-child {
  margin-top: 0;
}

.prose {
  max-width: var(--measure);
}

.prose p {
  margin: 0 0 1.25rem;
}

.prose h2 {
  font-family: var(--font-display);
  font-size: 1.1875rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 1.75rem 0 0.5rem;
}

.prose ul {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose code {
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.875em;
  background: var(--accent-soft);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

.note {
  color: var(--ink-2);
  font-size: 0.875rem;
  line-height: 1.9;
}

.updated {
  color: var(--ink-2);
  font-size: 0.8125rem;
  margin: 0 0 2.5rem;
}

.en {
  border-top: 1px solid var(--rule);
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  color: var(--ink-2);
}

.en h2,
.en h3 {
  color: var(--ink);
}

/* --- 棚に並ぶもの ------------------------------------------------ */

.shelf {
  margin: 0;
  padding: 0;
  list-style: none;
}

.item {
  border-left: 3px solid var(--accent);
  padding-left: 1.5rem;
}

.item__name {
  font-family: var(--font-display);
  font-size: 1.4375rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
}

.item__name a {
  color: var(--ink);
  text-decoration-color: var(--rule);
}

.item__summary {
  max-width: var(--measure);
  margin: 0 0 1.5rem;
}

.item__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
  font-size: 0.875rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.empty {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
  padding-top: 1.5rem;
  color: var(--ink-2);
  font-size: 0.875rem;
}

/* --- カードの再現 ------------------------------------------------ */
/* Google カレンダー上での見え方をそのまま写したもの。
   サイト側の配色をあえて当てず、実物に寄せている。 */

.preview {
  margin: 0 0 1.5rem;
}

.preview__caption {
  color: var(--ink-2);
  font-size: 0.8125rem;
  margin: 0.75rem 0 0;
}

.gcard {
  width: 100%;
  max-width: 21rem;
  background: #fff;
  border: 1px solid #dadce0;
  border-radius: 8px;
  overflow: hidden;
  font-family: "Roboto", var(--font-body);
  color: #202124;
  line-height: 1.5;
}

.gcard__bar {
  background: #f1f3f4;
  border-bottom: 1px solid #dadce0;
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  color: #5f6368;
}

.gcard__head {
  padding: 1rem 1rem 0.5rem;
}

.gcard__title {
  font-size: 0.9375rem;
  font-weight: 500;
}

.gcard__sub {
  font-size: 0.75rem;
  color: #5f6368;
}

.gcard__row {
  padding: 0.75rem 1rem;
  border-top: 1px solid #e8eaed;
}

.gcard__label {
  font-size: 0.6875rem;
  color: #5f6368;
}

.gcard__value {
  font-size: 1.0625rem;
}

.gcard__meta {
  font-size: 0.6875rem;
  color: #5f6368;
}

/* --- 小さい画面 -------------------------------------------------- */

@media (max-width: 34rem) {
  .sheet {
    padding: 2rem 1.25rem;
  }

  .title {
    font-size: 1.625rem;
  }

  .item {
    padding-left: 1.125rem;
  }

  .item__name {
    font-size: 1.25rem;
  }
}