/* ============================================================
   HIKYAKU Blog Theme
   Design system: matsuba green + Shippori Mincho + kincha
   ============================================================ */

:root {
  --matsuba-deep: #1F3829;
  --matsuba-mid:  #3B6E42;
  --matsuba-light: #7DBB8A;
  --washi:        #F0F5EB;
  --paper:        #F5F1EA;
  --kincha:       #C2991C;
  --sumi:         #14181A;
  --sumi-soft:    #3B3936;
  --rule:         #E4DFD4;

  --f-mincho: "Shippori Mincho B1", "Noto Serif JP", serif;
  --f-serif-en: "Fraunces", Georgia, serif;
  --f-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--f-mincho);
  background: var(--paper);
  color: var(--sumi);
  font-size: 16px;
  line-height: 2;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
html[lang="en"] body { font-family: var(--f-sans); line-height: 1.75; }

::selection { background: var(--matsuba-deep); color: var(--washi); }
a { color: var(--matsuba-mid); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--kincha); }
img { display: block; max-width: 100%; }

/* ---- Layout ---- */
.wrap { max-width: 720px; margin: 0 auto; padding: 0 24px; }

/* ---- Header ---- */
.site-header {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 48px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}
.site-brand {
  font-family: var(--f-mincho);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 0.4em;
  color: var(--matsuba-deep);
  text-decoration: none;
}
html[lang="en"] .site-brand { font-family: var(--f-serif-en); letter-spacing: 0.2em; }
.site-nav { display: flex; gap: 24px; }
.site-nav a {
  font-family: var(--f-sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--sumi-soft);
  text-transform: uppercase;
}
.site-nav a:hover { color: var(--kincha); }

/* ---- Home / List ---- */
.site-tagline {
  font-family: var(--f-mincho);
  font-size: 14px;
  color: var(--sumi-soft);
  margin-bottom: 64px;
  letter-spacing: 0.06em;
  opacity: 0.8;
}
html[lang="en"] .site-tagline { font-family: var(--f-serif-en); font-weight: 300; }

.post-list { list-style: none; }
.post-item {
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
}
.post-item:first-child { padding-top: 0; }
.post-date {
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--kincha);
  margin-bottom: 8px;
}
.post-title {
  font-family: var(--f-mincho);
  font-size: 24px;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--matsuba-deep);
  margin-bottom: 8px;
}
.post-title a { color: inherit; }
.post-title a:hover { color: var(--kincha); }
html[lang="en"] .post-title {
  font-family: var(--f-serif-en);
  font-weight: 400;
  letter-spacing: -0.01em;
  font-size: 26px;
}
.post-summary {
  font-size: 14px;
  line-height: 1.9;
  color: var(--sumi-soft);
  max-width: 60ch;
}
.post-tags { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 8px; }
.post-tag {
  font-family: var(--f-sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sumi-soft);
  opacity: 0.6;
  padding: 3px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
}
.post-tag:hover { border-color: var(--kincha); color: var(--kincha); opacity: 1; }

/* ---- Single post ---- */
.article-header { margin-bottom: 48px; }
.article-date {
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--kincha);
  margin-bottom: 16px;
}
.article-title {
  font-family: var(--f-mincho);
  font-size: 32px;
  font-weight: 300;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--matsuba-deep);
  margin-bottom: 16px;
}
html[lang="en"] .article-title {
  font-family: var(--f-serif-en);
  font-weight: 300;
  letter-spacing: -0.01em;
  font-size: 36px;
  line-height: 1.2;
}
.article-rule {
  width: 32px;
  height: 1px;
  background: var(--kincha);
  opacity: 0.7;
}

/* Article body */
.article-body { margin-bottom: 64px; }
.article-body p { margin-bottom: 24px; color: var(--sumi-soft); max-width: 65ch; }
.article-body h2 {
  font-family: var(--f-mincho);
  font-size: 22px;
  font-weight: 400;
  color: var(--matsuba-deep);
  margin: 56px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  letter-spacing: 0.04em;
}
html[lang="en"] .article-body h2 { font-family: var(--f-serif-en); font-weight: 400; font-size: 24px; }
.article-body h3 {
  font-family: var(--f-mincho);
  font-size: 18px;
  font-weight: 500;
  color: var(--matsuba-deep);
  margin: 40px 0 12px;
}
.article-body ul, .article-body ol {
  margin: 0 0 24px 20px;
  color: var(--sumi-soft);
}
.article-body li { margin-bottom: 8px; }
.article-body strong { font-weight: 500; color: var(--sumi); }
.article-body em { font-style: normal; color: var(--kincha); }
.article-body blockquote {
  margin: 32px 0;
  padding: 24px 28px;
  border-left: 3px solid var(--kincha);
  background: var(--washi);
  font-size: 15px;
  color: var(--sumi-soft);
}
.article-body code {
  font-family: var(--f-mono);
  font-size: 0.9em;
  background: var(--washi);
  padding: 2px 6px;
  border-radius: 3px;
}
.article-body pre {
  margin: 24px 0;
  padding: 20px 24px;
  background: var(--matsuba-deep);
  color: var(--washi);
  border-radius: 4px;
  overflow-x: auto;
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.7;
}
.article-body pre code { background: none; padding: 0; }
.article-body img {
  margin: 32px 0;
  border-radius: 2px;
  border: 1px solid var(--rule);
}

/* ---- Footer ---- */
.site-footer {
  margin-top: 64px;
  padding: 32px 0;
  border-top: 1px solid var(--rule);
  font-size: 12px;
  color: var(--sumi-soft);
  display: flex;
  flex-direction: column;
  gap: 24px;
}
@media (min-width: 640px) {
  .site-footer { flex-direction: row; justify-content: space-between; align-items: flex-end; }
}
.site-footer a { color: var(--sumi-soft); opacity: 0.75; transition: opacity 0.3s ease, color 0.3s ease; }
.site-footer a:hover { color: var(--kincha); opacity: 1; }

.footer-social {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-social-label {
  font-family: var(--f-sans);
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  font-size: 10px;
  color: var(--sumi-soft);
  opacity: 0.5;
}
.footer-social-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--f-mono);
  font-size: 12px;
}
.footer-social-links a span.platform {
  font-family: var(--f-sans);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sumi-soft);
  opacity: 0.55;
  margin-right: 8px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 11px;
  letter-spacing: 0.06em;
  opacity: 0.7;
  align-items: center;
}
.footer-legal span { opacity: 0.7; }

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .site-header { flex-direction: column; gap: 16px; align-items: center; text-align: center; }
  .site-nav { justify-content: center; }
  .site-footer { align-items: center; text-align: center; }
  .footer-social { align-items: center; }
  .footer-social-links { align-items: center; }
  .footer-legal { justify-content: center; }
  .article-title { font-size: 26px; }
  html[lang="en"] .article-title { font-size: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; }
}