/* index.html と同じ配色・書体で、文書ページ用に組み直したもの */
:root {
  --ink: #16131a;
  --paper: #fbf9f8;
  --coral: #ff6b4a;
  --coral-deep: #d8452a;
  --on-ink: #f4f0ef;
  --on-ink-dim: #a49ba8;
  --on-paper: #221d27;
  --on-paper-dim: #6b6470;
  --hair: rgba(34, 29, 39, .12);
  --hair-ink: rgba(244, 240, 239, .14);
  --gutter: clamp(1.25rem, 5vw, 3rem);

  --display: "Shippori Mincho B1", "Hiragino Mincho ProN", serif;
  --body: "Zen Kaku Gothic New", "Hiragino Sans", system-ui, sans-serif;
  --mono: "DM Mono", ui-monospace, SFMono-Regular, monospace;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--on-paper);
  font-family: var(--body);
  font-size: 16.5px;
  line-height: 1.95;
  letter-spacing: .01em;
}

::selection { background: var(--coral); color: #fff; }

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

a { color: var(--coral-deep); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--coral); }

.doc-head {
  background: var(--ink);
  padding: 1.4rem var(--gutter);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--mono);
  font-size: .84rem;
  letter-spacing: .16em;
  color: var(--on-ink);
  text-decoration: none;
}
.brand .mark {
  width: 1.05rem; height: 1.05rem;
  border-radius: 50%;
  border: 2.5px solid var(--coral);
  border-right-color: transparent;
  transform: rotate(-38deg);
}

.doc {
  max-width: 40rem;
  margin-inline: auto;
  padding: clamp(2.5rem, 7vw, 5rem) var(--gutter) clamp(3rem, 8vw, 6rem);
}

.eyebrow {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--coral-deep);
  margin: 0 0 .9rem;
}

h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  line-height: 1.35;
  text-wrap: balance;
  margin: 0;
}

h2 {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.25rem;
  line-height: 1.5;
  margin: 2.8rem 0 .6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--hair);
}

h3 {
  font-family: var(--body);
  font-weight: 700;
  font-size: 1rem;
  margin: 1.8rem 0 .2rem;
}

p { margin: 0 0 1rem; }

.updated {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--on-paper-dim);
  margin: .8rem 0 2.4rem;
}

strong { font-weight: 700; }

/* まだ開発中の機能に添える印。index.html とアプリ内の表記に揃えている。 */
.beta {
  display: inline-block;
  font-family: var(--mono);
  font-size: .64rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--coral-deep);
  border: 1px solid rgba(216, 69, 42, .38);
  border-radius: 999px;
  padding: .1em .55em;
  margin-left: .35em;
  vertical-align: .08em;
  white-space: nowrap;
}

/* 読み飛ばしてほしくない注意書き。 */
.callout {
  border-left: 2px solid var(--coral);
  padding: .1rem 0 .1rem 1.1rem;
  color: var(--on-paper-dim);
  font-size: .93rem;
  margin: 0 0 1rem;
}

ul { padding-left: 1.2rem; margin: 0 0 1rem; }
li { margin-bottom: .35rem; }

.doc-foot {
  background: var(--ink);
  color: var(--on-ink-dim);
  padding: 2.2rem var(--gutter);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: center;
  font-size: .88rem;
}
.doc-foot a { color: var(--on-ink); text-decoration: none; border-bottom: 1px solid var(--hair-ink); padding-bottom: 2px; }
.doc-foot a:hover { color: var(--coral); border-bottom-color: var(--coral); }
.copyright { font-family: var(--mono); font-size: .74rem; letter-spacing: .08em; }