/* =========================================
   SHARED VARIABLES & BASE
   ========================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #04040f;
  --bg2:        #080820;
  --bg3:        #0d0d2a;
  --accent:     #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.12);
  --text:       #e2e8f0;
  --text-mid:   #94a3b8;
  --text-dim:   #4a5a6e;
  --border:     rgba(0, 212, 255, 0.12);
  --border2:    rgba(255, 255, 255, 0.05);
  --font:       'Space Grotesk', sans-serif;
  --mono:       'JetBrains Mono', monospace;
  --r:          8px;
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  overflow-x: hidden;
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }

/* =========================================
   NAV
   ========================================= */
nav#nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(4, 4, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border2);
}
.nav-logo { font-weight: 600; font-size: 1rem; letter-spacing: .02em; }
.nav-logo .accent { color: var(--accent); }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-size: .85rem;
  color: var(--text-mid);
  letter-spacing: .04em;
  transition: color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* =========================================
   BLOG INDEX
   ========================================= */
.blog-hero {
  padding: 5rem 2rem 3rem;
  max-width: 760px;
  margin: 0 auto;
}
.section-tag {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: .75rem;
}
.blog-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1rem;
}
.blog-subtitle {
  font-size: 1rem;
  color: var(--text-mid);
}

.posts-list {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}
.post-item {
  display: block;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border2);
  transition: opacity .2s;
}
.post-item:hover { opacity: .8; }
.post-item:hover .post-title { color: var(--accent); }
.post-meta {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--text-dim);
  letter-spacing: .08em;
  margin-bottom: .5rem;
}
.post-tags { display: inline-flex; gap: .4rem; margin-left: .75rem; }
.post-tag {
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: .1rem .4rem;
  font-size: .62rem;
  letter-spacing: .06em;
}
.post-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: .4rem;
  transition: color .2s;
}
.post-excerpt {
  font-size: .9rem;
  color: var(--text-mid);
  line-height: 1.65;
}

.no-posts {
  padding: 4rem 0;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: .85rem;
  letter-spacing: .08em;
}

/* =========================================
   SINGLE POST
   ========================================= */
.post-header {
  max-width: 760px;
  margin: 0 auto;
  padding: 5rem 2rem 2.5rem;
}
.post-header-meta {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--text-dim);
  letter-spacing: .1em;
  margin-bottom: 1rem;
}
.post-header-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}
.post-header-tags { display: flex; gap: .5rem; flex-wrap: wrap; }

.post-content {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}
.post-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2.5rem 0 .75rem;
  color: var(--text);
}
.post-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 2rem 0 .5rem;
  color: var(--text);
}
.post-content p { margin-bottom: 1.25rem; color: var(--text-mid); }
.post-content a { color: var(--accent); border-bottom: 1px solid var(--border); }
.post-content a:hover { border-color: var(--accent); }
.post-content ul, .post-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-mid);
}
.post-content li { margin-bottom: .4rem; }
.post-content code {
  font-family: var(--mono);
  font-size: .85em;
  background: var(--bg3);
  color: var(--accent);
  padding: .15em .4em;
  border-radius: 3px;
}
.post-content pre {
  background: var(--bg3);
  border: 1px solid var(--border2);
  border-radius: var(--r);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
.post-content pre code {
  background: none;
  color: var(--text);
  padding: 0;
  font-size: .85rem;
}
.post-content blockquote {
  border-left: 2px solid var(--accent);
  padding: .75rem 1.25rem;
  margin: 1.5rem 0;
  color: var(--text-mid);
  background: var(--accent-dim);
  border-radius: 0 var(--r) var(--r) 0;
}
.post-content hr {
  border: none;
  border-top: 1px solid var(--border2);
  margin: 2.5rem 0;
}

.post-nav {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 2rem 5rem;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border2);
  gap: 1rem;
}
.post-nav a {
  font-size: .85rem;
  color: var(--text-mid);
  transition: color .2s;
}
.post-nav a:hover { color: var(--accent); }
.post-nav-label {
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: .1em;
  color: var(--text-dim);
  margin-bottom: .25rem;
}

/* =========================================
   FOOTER
   ========================================= */
footer {
  border-top: 1px solid var(--border2);
  padding: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .8rem;
  color: var(--text-dim);
}
.footer-copy { font-family: var(--mono); font-size: .7rem; letter-spacing: .06em; }

/* =========================================
   BACK LINK
   ========================================= */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--text-dim);
  transition: color .2s;
  max-width: 760px;
  margin: 0 auto;
  padding: 1.5rem 2rem 0;
  display: block;
}
.back-link:hover { color: var(--accent); }