/*====================================================================
  Darkly Custom Theme (Dr. Moinul Islam) – with Enhanced Left-Side TOC
====================================================================*/

body {
  background: #0d1117;
  color: #e4e4e4;
  font-family: 'Inter', sans-serif;
}

.navbar {
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

h1, h2, h3, h4, h5, h6 {
  color: #00ff7f; /* green headings */
  transition: text-shadow 0.3s ease, color 0.3s ease;
}

h1:hover, h2:hover, h3:hover, h4:hover, h5:hover, h6:hover {
  text-shadow: 0 0 8px rgba(0, 255, 127, 0.6), 0 0 12px rgba(0, 255, 127, 0.4);
}

.card {
  background: rgba(20, 24, 30, 0.85);
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: 0 4px 20px rgba(0, 188, 212, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 188, 212, 0.15);
}

.btn-primary {
  background: linear-gradient(45deg, #00bcd4, #14f1f1);
  border: none;
  color: #fff;
  transition: all 0.3s ease;
}
.btn-primary:hover {
  box-shadow: 0 0 10px #14f1f1, 0 0 20px #00bcd4;
  transform: translateY(-2px);
}

a, .nav-link {
  color: #00bcd4;
  transition: color 0.3s ease, text-shadow 0.3s ease;
}
a:hover, .nav-link:hover {
  color: #14f1f1;
  text-shadow: 0 0 5px #14f1f1;
}

/* --- Left Floating TOC --- */
#toc {
  position: fixed;
  top: 70px; /* adjust if navbar height changes */
  left: 0;
  width: 240px;
  height: calc(100% - 80px);
  overflow-y: auto;
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(10px);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 15px;
  box-shadow: 2px 0 10px rgba(0, 188, 212, 0.05);
}

#toc .tocify-header, #toc .tocify-subheader {
  color: #e4e4e4;
  margin: 5px 0;
}

#toc a {
  color: #b0b0b0;
  text-decoration: none;
  transition: color 0.3s ease, text-shadow 0.3s ease;
}

#toc a:hover {
  color: #14f1f1;
  text-shadow: 0 0 4px #14f1f1;
}

#toc .tocify-focus > a {
  color: #00bcd4;
  font-weight: bold;
}

/* Main content shifts right due to TOC */
.main-content {
  margin-left: 260px; /* 240px + padding */
  padding: 30px;
}

/* Scrollbar styling */
#toc::-webkit-scrollbar {
  width: 8px;
}
#toc::-webkit-scrollbar-track {
  background: transparent;
}
#toc::-webkit-scrollbar-thumb {
  background-color: #444;
  border-radius: 4px;
}