/* Apple-style minimal theme — night sky blue */
:root {
  --bg: #0f172a;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --link: #7dd3fc;
  --font-sans: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max-width: 980px;
  --spacing: 2rem;
  --spacing-lg: 4rem;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
}

/* Header */
.site-header {
  padding: var(--spacing) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing);
}

.site-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-title:hover {
  color: var(--link);
}

.nav {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--text);
}

/* Main */
.main {
  min-height: calc(100vh - 12rem);
  padding: var(--spacing-lg) 0;
}

.page-content,
.home-content {
  padding-top: 0.5rem;
}

.page-title,
.home-title {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 var(--spacing);
  line-height: 1.15;
}

.home-title {
  margin-bottom: 0.5rem;
}

.home-intro {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin: 0 0 var(--spacing);
}

.home-content .home-intro + .home-intro {
  margin-top: 0.75rem;
}

.cta-link {
  font-size: 1.1rem;
  color: var(--link);
  text-decoration: none;
}

.cta-link:hover {
  text-decoration: underline;
}

/* Post list */
.post-group {
  margin-bottom: var(--spacing-lg);
}

.group-date {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0 0 0.75rem;
  text-transform: none;
  letter-spacing: 0;
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem;
}

.post-link {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
}

.post-link:hover {
  color: var(--link);
}

.metadata {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.metadata .tag {
  display: inline-block;
  margin-left: 0.25rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: var(--spacing) 0;
}

.tag-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
}

.tag-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.12);
}

.back-link {
  margin-top: var(--spacing-lg);
}

.back-link a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.back-link a:hover {
  color: var(--link);
}

/* Article (single) */
.article-header {
  margin-bottom: var(--spacing);
}

.article-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 0.5rem;
  line-height: 1.2;
}

.article-body {
  font-size: 1.05rem;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

.article-body p {
  margin: 0 0 1rem;
}

.article-body a {
  color: var(--link);
  text-decoration: none;
}

.article-body a:hover {
  text-decoration: underline;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

.article-body pre,
.article-body code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9em;
}

.article-body pre {
  background: rgba(255, 255, 255, 0.08);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0 0 1rem;
}

.article-body code {
  padding: 0.15em 0.35em;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.12);
}

.article-body pre code {
  padding: 0;
  background: none;
}

/* Disqus comments */
.disqus-comments {
  margin-top: var(--spacing-lg);
}

/* Footer */
.site-footer {
  padding: var(--spacing) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}