@import url('https://fonts.googleapis.com/css2?family=Sarabun:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --black:       #0d0d0d;
  --ink:         #1c1c1c;
  --gray-dark:   #3a3a3a;
  --gray:        #767676;
  --gray-light:  #b0b0b0;
  --gray-bg:     #f4f4f4;
  --white:       #ffffff;
  --blue:        #1447c0;
  --blue-light:  #e8eefb;
  --blue-border: #b8c9f0;
  --border:      #dedede;
  --rule-heavy:  2px solid var(--black);
  --rule:        1px solid var(--border);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: 'Sarabun', sans-serif; background: var(--white); color: var(--ink); line-height: 1.6; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

nav { border-top: 3px solid var(--black); border-bottom: var(--rule); padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; height: 54px; position: sticky; top: 0; background: var(--white); z-index: 100; }
.nav-name { font-family: 'Sarabun', sans-serif; font-size: 1.05rem; font-weight: 700; color: var(--black); letter-spacing: -0.01em; text-decoration: none; }
.nav-links { list-style: none; display: flex; }
.nav-links a { font-family: 'Sarabun', sans-serif; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--gray-dark); text-decoration: none; padding: 0 1.1rem; line-height: 54px; display: block; border-left: var(--rule); }
.nav-links a:hover { color: var(--blue); background: var(--blue-light); }
.nav-links a.active { color: var(--blue); }

.page { max-width: 980px; margin: 0 auto; padding: 0 2rem; }
section { padding: 2.75rem 0; border-bottom: var(--rule); }
section:last-child { border-bottom: none; }
.section-head { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 1.5rem; padding-bottom: 0.6rem; border-bottom: var(--rule-heavy); }
.section-title { font-family: 'Sarabun', sans-serif; font-size: 1.45rem; font-weight: 700; color: var(--black); letter-spacing: -0.01em; }
.section-count { font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; color: var(--blue); letter-spacing: 0.05em; }

.blog-card { display: grid; grid-template-columns: 1fr auto; gap: 1rem; align-items: baseline; padding: 0.9rem 0; border-top: var(--rule); cursor: pointer; text-decoration: none; color: inherit; }
.blog-card:first-of-type { border-top: none; }
.blog-card:hover .blog-title { color: var(--blue); }
.blog-title { font-family: 'Sarabun', sans-serif; font-size: 1rem; font-weight: 600; line-height: 1.4; color: var(--black); transition: color 0.15s; margin-bottom: 0.15rem; }
.blog-meta { font-family: 'JetBrains Mono', monospace; font-size: 0.67rem; color: var(--gray); letter-spacing: 0.02em; }
.blog-topic { font-family: 'JetBrains Mono', monospace; font-size: 0.63rem; color: var(--gray-dark); background: var(--gray-bg); border: var(--rule); padding: 0.15rem 0.55rem; border-radius: 2px; white-space: nowrap; letter-spacing: 0.04em; text-transform: uppercase; }

footer { border-top: var(--rule-heavy); padding: 1.25rem 2rem; display: flex; justify-content: space-between; align-items: center; }
footer p { font-family: 'JetBrains Mono', monospace; font-size: 0.67rem; color: var(--gray); letter-spacing: 0.04em; }
footer .footer-name { font-family: 'Sarabun', sans-serif; font-size: 0.82rem; font-weight: 700; color: var(--black); }

.post-header { padding: 2.5rem 0 2rem; border-bottom: var(--rule-heavy); margin-bottom: 2.5rem; }
.post-kicker { font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--blue); margin-bottom: 0.75rem; }
.post-title { font-family: 'Sarabun', sans-serif; font-size: 2.4rem; font-weight: 800; line-height: 1.1; letter-spacing: -0.01em; color: var(--black); margin-bottom: 0.85rem; }
.post-date { font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; color: var(--gray); letter-spacing: 0.04em; }

.post-body { max-width: 680px; font-size: 1.02rem; line-height: 1.8; color: var(--ink); padding-bottom: 4rem; }
.post-body h1, .post-body h2, .post-body h3, .post-body h4 { font-family: 'Sarabun', sans-serif; font-weight: 700; color: var(--black); margin: 2rem 0 0.75rem; line-height: 1.25; }
.post-body h1 { font-size: 1.75rem; }
.post-body h2 { font-size: 1.4rem; padding-bottom: 0.4rem; border-bottom: var(--rule); }
.post-body h3 { font-size: 1.15rem; }
.post-body h4 { font-size: 1rem; }
.post-body p { margin-bottom: 1.25rem; }
.post-body a { color: var(--blue); text-decoration: underline; text-underline-offset: 2px; }
.post-body a:hover { color: var(--black); }
.post-body ul, .post-body ol { padding-left: 1.5rem; margin-bottom: 1.25rem; }
.post-body li { margin-bottom: 0.35rem; }
.post-body blockquote { border-left: 3px solid var(--black); padding: 0.5rem 0 0.5rem 1.25rem; margin: 1.5rem 0; color: var(--gray-dark); font-style: italic; }
.post-body code { font-family: 'JetBrains Mono', monospace; font-size: 0.85em; background: var(--gray-bg); border: var(--rule); padding: 0.1em 0.4em; border-radius: 2px; color: var(--black); }
.post-body pre { background: var(--black); border-radius: 3px; padding: 1.25rem 1.5rem; overflow-x: auto; margin-bottom: 1.5rem; }
.post-body pre code { background: none; border: none; padding: 0; color: #e8e8e8; font-size: 0.85rem; line-height: 1.6; }
.post-body img { max-width: 100%; height: auto; border: var(--rule); margin: 1rem 0; }
.post-body hr { border: none; border-top: var(--rule-heavy); margin: 2.5rem 0; }
.post-body table { width: 100%; border-collapse: collapse; margin-bottom: 1.5rem; font-size: 0.9rem; }
.post-body th, .post-body td { padding: 0.6rem 0.9rem; text-align: left; border: var(--rule); }
.post-body th { font-weight: 700; background: var(--gray-bg); }

.back-link { display: inline-flex; align-items: center; gap: 0.4rem; font-family: 'JetBrains Mono', monospace; font-size: 0.72rem; letter-spacing: 0.04em; color: var(--gray); text-decoration: none; padding: 1.5rem 0 0; display: block; }
.back-link:hover { color: var(--blue); text-decoration: none; }

.state-empty, .state-error { font-size: 0.85rem; color: var(--gray-light); font-style: italic; padding: 1.5rem 0; }

@media (max-width: 640px) {
  nav { padding: 0 1rem; }
  .nav-links a { padding: 0 0.7rem; font-size: 0.72rem; }
  .page { padding: 0 1rem; }
  .post-title { font-size: 1.75rem; }
  .blog-card { grid-template-columns: 1fr; }
  .blog-topic { display: none; }
}