* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #ffffff;
  color: #111827;
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 56px 20px;
  position: relative;
}

.sidebar {
  position: fixed;
  left: calc(50% - 620px);
  top: 56px;
  width: 180px;
}

.logo {
  display: inline-block;
  font-size: 22px;
  font-weight: 900;
  margin-bottom: 18px;
  letter-spacing: -0.03em;
}

.side-desc {
  font-size: 13px;
  color: #6b7280;
  line-height: 1.7;
  margin-bottom: 36px;
}

.menu {
  display: flex;
  flex-direction: column;
  gap: 13px;
  font-size: 14px;
  color: #6b7280;
}

.menu a:hover,
.logo:hover,
.post-title:hover {
  color: #2563eb;
}

.content {
  max-width: 820px;
  margin: 0 auto;
}

.intro {
  margin-bottom: 64px;
  line-height: 1.8;
  color: #374151;
  font-size: 17px;
}

.intro strong {
  color: #111827;
}

.section-title {
  font-size: 15px;
  color: #9ca3af;
  margin-bottom: 28px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.post-card {
  margin-bottom: 40px;
}

.post-date {
  font-size: 13px;
  color: #9ca3af;
  margin-bottom: 6px;
}

.post-title {
  display: block;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.post-desc {
  font-size: 15px;
  color: #6b7280;
  line-height: 1.7;
}

.tags {
  margin-top: 8px;
  font-size: 12px;
  color: #9ca3af;
}

.article {
  margin-top: 84px;
  padding-top: 44px;
  border-top: 1px solid #e5e7eb;
}

.article h1 {
  font-size: 34px;
  margin: 0 0 10px;
  letter-spacing: -0.03em;
}

.article-date {
  font-size: 13px;
  color: #9ca3af;
  margin-bottom: 32px;
}

.article-summary {
  margin-bottom: 24px;
  color: #6b7280;
  line-height: 1.8;
}

.article-content {
  line-height: 1.85;
  font-size: 16px;
  color: #1f2937;
}

.article-content h2 {
  margin-top: 44px;
  font-size: 23px;
  letter-spacing: -0.02em;
}

.article-content p,
.article-content ul,
.article-content ol {
  margin: 18px 0;
}

.article-content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 24px 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 15px;
}

.article-content th,
.article-content td {
  padding: 16px 12px;
  border-bottom: 1px solid #e5e7eb;
  text-align: center;
}

.article-content th {
  font-weight: 800;
  color: #111827;
}

.article-content td {
  color: #1f2937;
}

.article-content tr:last-child td {
  border-bottom: none;
}

code {
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 90%;
}

pre {
  background: #111827;
  color: #e5e7eb;
  padding: 22px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 22px 0;
  line-height: 1.6;
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
}

@media (max-width: 900px) {
  .container {
    padding: 32px 20px;
  }

  .sidebar {
    position: static;
    width: auto;
    margin-bottom: 48px;
  }

  .menu {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .content {
    max-width: 100%;
  }

  .article {
    margin-top: 56px;
  }
}