:root {
  color-scheme: light;
  --metal: #c9c3b6;
  --ink: #171512;
  --brass: #8d7048;
  --red: #9c3a32;
  --red-press: #7d2e28;
  --quiet: #4e493f;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--metal);
  color: var(--ink);
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  font-size: 1.05rem;
  line-height: 1.7;
}

main {
  width: min(36rem, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 4.5rem 0 5rem;
}

.mark {
  width: 7.5rem;
  height: 7.5rem;
  display: block;
  border-radius: 1.4rem;
}

h1 {
  margin: 1.4rem 0 1rem;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-weight: 600;
  font-size: 3.1rem;
  line-height: 1.15;
  letter-spacing: 0.04em;
}

p { margin: 0 0 1rem; max-width: 34em; }

ul {
  margin: 1.6rem 0 2.4rem;
  padding: 0;
  list-style: none;
}

li {
  margin: 0;
  padding: 0.7rem 0;
  border-top: 1px solid rgba(23, 21, 18, 0.16);
}

li:last-child { border-bottom: 1px solid rgba(23, 21, 18, 0.16); }

.shutter {
  width: 7.2rem;
  height: 7.2rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--red);
  color: #f6efe6;
  text-decoration: none;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: 1.35rem;
  letter-spacing: 0.12em;
}

.shutter:hover { background: var(--red-press); }
.shutter:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}
.shutter:active { transform: scale(0.97); }

.meta {
  margin-top: 1.1rem;
  color: var(--quiet);
  font-size: 0.95rem;
}

.meta a { color: inherit; }

@media (max-width: 640px) {
  main { padding-top: 2.6rem; }
  h1 { font-size: 2.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .shutter:active { transform: none; }
}