:root {
  --matrix-green: #00ff41;
  --matrix-green-dim: #00cc33;
  --matrix-bg: #0b0f0c;
  --matrix-bg-elev: #0f1411;
  --text-primary: #d0f5da;
  --text-secondary: #7ac992;
  --text-dim: #5aa36b;
  --border: #13351f;
  --accent: var(--matrix-green);
  --shadow: rgba(0, 255, 65, 0.15);
  --nav-height: 0px;
}

html[data-theme="light"] {
  --matrix-bg: #f7fff8;
  --matrix-bg-elev: #ecfff0;
  --text-primary: #0a1a10; /* darker for higher contrast */
  --text-secondary: #184a2c; /* deepen secondary for readability */
  --text-dim: #2c643f; /* slightly darker dim text */
  --border: #b7e7c5;
  --shadow: rgba(0, 100, 28, 0.10);
  --accent: #0b6e24; /* soften neon to accessible green in light mode */
  --accent-hover: #095c1e;
  --link: #0b6e24;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body.matrix {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color: var(--text-primary);
  background: radial-gradient(1200px 800px at 80% -10%, rgba(0,255,65,0.05), transparent 60%),
              radial-gradient(1200px 800px at 0% 100%, rgba(0,255,65,0.04), transparent 60%),
              var(--matrix-bg);
  line-height: 1.7;
}

/* Layout */
.layout-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: auto 1fr; /* row 1: navbar, row 2: content */
  gap: 32px;
  max-width: 1200px;
  padding: 24px 24px 80px;
  margin: 0 auto;
  overflow: visible; /* ensure sticky sidebars can stick relative to viewport */
}

/* When a TOC is available, use a 3-column grid */
.layout-container.has-toc {
  grid-template-columns: 240px minmax(0, 1fr) 280px;
}

.sidebar {
  grid-column: 1;
  grid-row: 2;
  position: sticky;
  top: calc(var(--nav-height) + 16px);
  align-self: start;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(0,0,0,0.2), rgba(0,0,0,0)) , var(--matrix-bg-elev);
  box-shadow: 0 8px 24px var(--shadow);
  border-radius: 12px;
  padding: 16px;
}

.page-links, .mobile-page-links { list-style: none; padding: 0; margin: 0; }
.page-links a, .mobile-page-links a {
  display: block;
  padding: 8px 10px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: color .2s ease, background-color .2s ease, box-shadow .6s ease;
  will-change: box-shadow;
}
.page-links a:hover, .mobile-page-links a:hover {
  background: rgba(0, 255, 65, 0.08);
  color: var(--accent);
  box-shadow: 0 0 8px rgba(0,255,65,0.20), 0 0 16px rgba(0,255,65,0.15);
  animation: matrixGlow 1.6s ease-in-out infinite alternate;
}
html[data-theme="light"] .page-links a:hover,
html[data-theme="light"] .mobile-page-links a:hover {
  background: rgba(11, 110, 36, 0.12);
}

/* Top nav */
.top-nav {
  grid-column: 1 / -1; /* span all grid columns */
  grid-row: 1;
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  margin-bottom: 0; /* spacing handled by grid row gap */
  border: 1px solid var(--border);
  background: linear-gradient(0deg, rgba(0,0,0,0.2), rgba(0,0,0,0)) , var(--matrix-bg-elev);
  box-shadow: 0 8px 24px var(--shadow);
  border-radius: 12px;
}
.site-title {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.02em;
}
.nav-controls { display: flex; align-items: center; gap: 8px; }
.hamburger-menu, .theme-toggle, .toc-toggle, .rain-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
}
.hamburger-menu:hover, .theme-toggle:hover, .toc-toggle:hover, .rain-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* Hide hamburger and TOC toggle on desktop */
@media (min-width: 1200px) {
  .hamburger-menu,
  .toc-toggle {
    display: none !important;
  }
}

/* Show hamburger and TOC toggle only on mobile/tablet */
@media (max-width: 1199px) {
  .hamburger-menu {
    display: flex;
  }
  
  .toc-toggle {
    display: flex;
  }
  
  /* Hide sidebars on mobile, show them via mobile menu instead */
  .sidebar,
  .toc-sidebar {
    display: none;
  }
  
  /* Adjust layout for mobile - single column */
  .layout-container {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr; /* Remove navbar from grid on mobile */
    padding: 16px;
    padding-top: 80px; /* Add space for fixed navbar */
  }
  
  .layout-container.has-toc {
    grid-template-columns: 1fr;
  }
  
  /* Make navbar break out of grid and span full width on mobile */
  .top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100vw;
    margin: 0;
    grid-column: unset;
    grid-row: unset;
    z-index: 100;
  }
  
  .main-content {
    grid-column: 1;
    grid-row: 1;
  }
}

/* TOC Sidebar */
.toc-sidebar {
  grid-column: 3;
  grid-row: 2;
  position: sticky;
  top: calc(var(--nav-height) + 16px);
  align-self: start;
  max-height: calc(100vh - 140px);
  overflow: auto;
  border: 1px solid var(--border);
  background: var(--matrix-bg-elev);
  box-shadow: 0 8px 24px var(--shadow);
  border-radius: 12px;
  padding: 16px;
}
.toc-sidebar .toc h2 { margin-top: 0; font-size: 14px; color: var(--text-dim); }

/* Make TOC links look like page list sidebar links */
.toc-sidebar .toc ul { list-style: none; padding: 0; margin: 0; }
.toc-sidebar .toc li { margin: 0; }
.toc-sidebar .toc a {
  display: block;
  padding: 8px 10px;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: color .2s ease, background-color .2s ease, box-shadow .6s ease;
  will-change: box-shadow;
}
.toc-sidebar .toc a:hover {
  background: rgba(0, 255, 65, 0.08);
  color: var(--accent);
  box-shadow: 0 0 8px rgba(0,255,65,0.20), 0 0 16px rgba(0,255,65,0.15);
  animation: matrixGlow 1.6s ease-in-out infinite alternate;
}
html[data-theme="light"] .toc-sidebar .toc a:hover {
  background: rgba(11, 110, 36, 0.12);
}
.toc-sidebar .toc ul ul { padding-left: 12px; }

/* Slow glow pulse for hover */
@keyframes matrixGlow {
  0% {
    box-shadow: 0 0 6px rgba(0,255,65,0.12), 0 0 12px rgba(0,255,65,0.10);
  }
  100% {
    box-shadow: 0 0 14px rgba(0,255,65,0.35), 0 0 28px rgba(0,255,65,0.22);
  }
}

/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  .page-links a:hover, .mobile-page-links a:hover, .toc-sidebar .toc a:hover {
    animation: none;
  }
}
.toc-sidebar .toc ul ul { padding-left: 12px; }

/* Main content */
.main-content { min-width: 0; grid-column: 2; grid-row: 2; }
.post-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.post-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(0,0,0,0.2), rgba(0,0,0,0)) , var(--matrix-bg-elev);
  box-shadow: 0 8px 24px var(--shadow);
  padding: 16px;
  text-decoration: none;
  color: var(--text-primary);
}
.post-card:hover { border-color: var(--accent); box-shadow: 0 8px 24px rgba(0,255,65,0.25); }
.post-card-header { display: flex; justify-content: space-between; gap: 16px; align-items: baseline; }
.post-title { margin: 0; font-weight: 700; letter-spacing: 0.01em; }
.post-date { color: var(--text-dim); font-size: 14px; }
.post-tags { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-family: "JetBrains Mono", monospace; font-size: 12px; color: var(--accent); background: rgba(0,255,65,0.08); border: 1px solid var(--border); border-radius: 999px; padding: 2px 8px; }
html[data-theme="light"] .tag { color: #0b6e24; background: #e8f3ec; border-color: #b7e7c5; }

/* Articles */
.post-article, .page-article {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(0,0,0,0.2), rgba(0,0,0,0)) , var(--matrix-bg-elev);
  border-radius: 12px;
  box-shadow: 0 8px 24px var(--shadow);
  padding: 24px;
}
.post-header .meta, .page-header .meta { color: var(--text-dim); }
.post-content, .page-content {
  margin-top: 16px;
}
.post-content pre, .page-content pre {
  border: 1px solid var(--border);
  background: #0a0f0c;
  border-radius: 10px;
  padding: 12px;
  overflow: auto;
}
.post-content code, .page-content code {
  color: var(--accent);
}

/* Ensure sufficient contrast for dates and meta in light mode */
html[data-theme="light"] .post-date,
html[data-theme="light"] .page-header .meta,
html[data-theme="light"] .post-header .meta {
  color: #335a3e;
}

/* Language pills */
.lang-switch { list-style: none; margin: 0; padding: 0; display: flex; gap: 6px; }
.lang-pill { font-family: "JetBrains Mono", monospace; font-size: 12px; display: inline-block; padding: 4px 8px; border-radius: 999px; border: 1px solid var(--border); color: var(--text-secondary); text-decoration: none; }
.lang-pill.is-active, .lang-pill:hover { color: var(--accent); border-color: var(--accent); }

/* Mobile */
.mobile-menu {
  display: none;
  position: absolute;
  top: 60px;
  right: 16px;
  border: 1px solid var(--border);
  background: var(--matrix-bg-elev);
  box-shadow: 0 8px 24px var(--shadow);
  border-radius: 12px;
  padding: 12px;
  z-index: 10;
}
.mobile-menu.show { display: block; }

/* Mobile TOC overlay */
@media (max-width: 1199px) {
  .toc-sidebar.show {
    display: block;
    position: fixed;
    top: 60px;
    right: 16px;
    left: 16px;
    z-index: 15;
    max-height: calc(100vh - 80px);
    width: auto;
    grid-column: unset;
    grid-row: unset;
  }
  
  .toc-sidebar.show .toc {
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
}

/* Scroll to top */
.scroll-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  border: 1px solid var(--border);
  background: var(--matrix-bg-elev);
  color: var(--accent);
  padding: 10px 12px;
  border-radius: 10px;
  box-shadow: 0 8px 24px var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  transition: all .2s ease-out;
  z-index: 2;
}
.scroll-to-top.visible { opacity: 1; transform: translateY(0); }

/* Headers */
.matrix-header h1 { margin: 0 0 6px 0; color: var(--accent); letter-spacing: 0.03em; }
.matrix-header .tagline { margin: 0; color: var(--text-secondary); }

/* Digital rain container ensures content overlays */
#digital-rain { position: fixed; inset: 0; z-index: 0; }

/* Links */
a { color: var(--link, var(--text-secondary)); text-decoration: none; }
a:hover { color: var(--accent-hover, var(--accent)); text-decoration: underline; text-underline-offset: 2px; }
a:focus-visible, .hamburger-menu:focus-visible, .theme-toggle:focus-visible, .toc-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Tables */
table { width: 100%; border-collapse: collapse; }
th, td { border: 1px solid var(--border); padding: 8px; }
th { background: rgba(0,255,65,0.06); }

/* Blockquotes */
blockquote { border-left: 3px solid var(--accent); margin: 16px 0; padding: 8px 16px; color: var(--text-secondary); background: rgba(0,255,65,0.04); }

/* Images */
img { max-width: 100%; border-radius: 8px; box-shadow: 0 6px 18px var(--shadow); }

/* Code inline */
code { font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }