* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f9f9f9;
  color: #222;
  padding: 3rem 1.5rem;
  max-width: 640px;
  margin: 0 auto;
}
h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}
.subtitle {
  color: #666;
  font-size: 0.95rem;
  margin-bottom: 2.5rem;
}
section {
  margin-bottom: 2.5rem;
}
h2 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #666;
  margin-bottom: 0.5rem;
}
ul {
  list-style: none;
}
li {
  border-top: 1px solid #e4e4e4;
  padding: 1rem 0;
}
li:last-child {
  border-bottom: 1px solid #e4e4e4;
}
a {
  color: #1a6ef5;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
}
a:hover {
  text-decoration: underline;
}
.summary {
  font-size: 0.75rem;
  color: #666;
  line-height: 1.55;
  margin-top: 0.35rem;
}
.date {
  font-size: 0.7rem;
  color: #999;
  margin-top: 0.25rem;
}
.meta {
  color: #666;
  font-size: 0.8rem;
  margin-bottom: 1rem;
}
.qr {
  margin-bottom: 2.5rem;
}
.tech-tags {
  margin-top: 0.25rem;
}
.tech-tag {
  display: inline-block;
  font-size: 0.65rem;
  color: #555;
  background: #e8e8e8;
  padding: 0.1em 0.5em;
  border-radius: 3px;
  margin-right: 0.3em;
  letter-spacing: 0.03em;
}
.section-desc {
  font-size: 0.75rem;
  color: #666;
  margin-bottom: 0.75rem;
}
.tag {
  display: inline-flex;
  align-items: center;
  font-size: 0.65rem;
  font-weight: 700;
  color: #f0f0f0;
  background: #444;
  padding: 0.15em 0.5em;
  border-radius: 3px;
  margin-right: 0.45em;
  letter-spacing: 0.06em;
  vertical-align: middle;
}
.num {
  font-size: 0.75rem;
  font-weight: 700;
  color: #666;
  margin-right: 0.5rem;
}
footer {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #e4e4e4;
  font-size: 0.85rem;
  color: #666;
}
.footer-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  flex: 0 0 auto;
}
footer a {
  font-size: 0.85rem;
  font-weight: 400;
}