@import url("https://fonts.googleapis.com/css2?family=Libre+Baskerville:wght@400;700&family=Source+Sans+3:wght@400;500;600&family=Noto+Sans+JP:wght@400;500;700&display=swap");

:root {
  color-scheme: light;
  --ink: #1c1f1e;
  --muted: #5c6361;
  --paper: #f6f5f1;
  --accent: #6f7f84;
  --line: rgba(28, 31, 30, 0.16);
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: "Source Sans 3", "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.8;
}

h1,
h2,
h3 {
  font-family: "Libre Baskerville", "Noto Sans JP", serif;
  letter-spacing: 0.02em;
  margin: 0 0 0.75rem;
}

p {
  margin: 0 0 1rem;
  color: var(--muted);
}

.site-header {
  padding: 4.5rem 1.5rem 1.5rem;
}

.site-wrap {
  max-width: 980px;
  margin: 0 auto;
}

.site-kicker {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.site-title {
  font-size: clamp(2.4rem, 5vw, 4.1rem);
  color: var(--ink);
}

.site-subtitle {
  font-size: 1.05rem;
  max-width: 42rem;
}

.site-main {
  padding: 0 1.5rem 4rem;
}

.intro {
  padding: 1rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.intro p {
  max-width: 58ch;
}

.posts {
  padding-top: 2.5rem;
}

.post-list {
  border-top: 1px solid var(--line);
}

.post-item {
  border-bottom: 1px solid var(--line);
  padding: 1.25rem 0;
}

.post-template {
  display: none;
}

.post-item details {
  margin: 0;
}

.post-item summary {
  list-style: none;
  display: flex;
  gap: 2.5rem;
  align-items: baseline;
  cursor: pointer;
  color: var(--ink);
}

.post-item summary::-webkit-details-marker {
  display: none;
}

.post-date {
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  width: 9.5rem;
  flex-shrink: 0;
}

.post-title {
  font-size: 1.15rem;
}

.post-body {
  padding: 0.75rem 0 0.5rem 0;
  margin-left: 12rem;
  max-width: 62ch;
}

.post-item details[open] summary {
  color: var(--ink);
}

.site-footer {
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 720px) {
  .site-header {
    padding-top: 3.5rem;
  }

  .post-item summary {
    flex-direction: column;
    gap: 0.35rem;
  }

  .post-date {
    width: auto;
  }

  .post-body {
    margin-left: 0;
  }
}