/* ===============================
 *   αOS INDEX CENTRE — STYLE
 *   =============================== */

/* ---------- BASE ---------- */
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

body {
  padding: 50px 20px;
  background: #000;
  color: #0f0;
  font-family: 'Courier New', monospace, sans-serif;
  text-align: center;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
}

.index-layout {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  align-items: start;
}

.doc-panel {
  position: sticky;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  z-index: 1;
}

.doc-title {
  font-size: 0.85em;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: rgba(0, 255, 0, 0.75);
  text-align: left;
}

.menu-panel {
  z-index: 1;
}

.chapter-page {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  text-align: left;
  position: relative;
  z-index: 1;
}

.chapter-toc {
  border: 1px solid #0f0;
  border-radius: 18px;
  padding: 18px;
  background: rgba(0, 0, 0, 0.7);
  box-shadow: 0 0 20px rgba(0, 255, 0, 0.35);
  max-height: 80vh;
  overflow-y: auto;
  position: sticky;
  top: 20px;
}

/* TOC scrollbar styling */
.chapter-toc::-webkit-scrollbar {
  width: 8px;
}
.chapter-toc::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.25);
  border-radius: 999px;
}
.chapter-toc::-webkit-scrollbar-thumb {
  background: rgba(0, 255, 0, 0.45);
  border-radius: 999px;
}
.chapter-toc::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 255, 0, 0.7);
}

.chapter-toc h3 {
  margin-top: 0;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.chapter-toc a {
  display: block;
  color: #0f0;
  text-decoration: none;
  border: 1px solid rgba(0, 255, 0, 0.3);
  border-radius: 8px;
  padding: 6px 10px;
  margin-bottom: 6px;
  font-size: 0.8em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.chapter-content {
  border: 1px solid #0f0;
  border-radius: 18px;
  padding: 22px;
  background: rgba(0, 0, 0, 0.8);
  box-shadow: 0 0 25px rgba(0, 255, 0, 0.35);
  max-height: 80vh;
  overflow-y: auto;
}

/* Content scrollbar styling */
.chapter-content::-webkit-scrollbar {
  width: 10px;
}
.chapter-content::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.25);
  border-radius: 12px;
}
.chapter-content::-webkit-scrollbar-thumb {
  background: rgba(0, 255, 0, 0.35);
  border-radius: 12px;
}
.chapter-content::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 255, 0, 0.65);
}

.chapter-content h1,
.chapter-content h2,
.chapter-content h3 {
  color: #0f0;
}

@media (max-width: 900px) {
  .chapter-page {
    grid-template-columns: 1fr;
  }
  .chapter-toc {
    position: static;
    max-height: none;
  }
  .chapter-content {
    max-height: none;
  }
}

/* ---------- MATRIX CANVAS ---------- */
#matrix-rain {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: -1;
pointer-events: none;
}

/* ---------- GRID ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 0;
  position: relative;
  z-index: 1;
}

.doc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 0;
  position: relative;
  z-index: 1;
}

.doc-card {
  color: #0f0;
  font-size: 1em;
  text-decoration: none;
  padding: 18px 16px;
  border: 2px dashed rgba(0, 255, 0, 0.6);
  border-radius: 16px;
  display: block;
  background: rgba(0, 20, 0, 0.35);
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.25);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  will-change: transform, box-shadow;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  text-align: left;
}

.doc-card h4 {
  margin: 0 0 10px;
  font-size: 1em;
  letter-spacing: 0.25em;
}

.doc-card p {
  margin: 0;
  color: rgba(0, 255, 0, 0.7);
  font-size: 0.7em;
  letter-spacing: 0.15em;
}

.doc-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 0 28px rgba(0, 255, 0, 0.4);
  border-color: #0f0;
}

@media (max-width: 900px) {
  .index-layout {
    grid-template-columns: 1fr;
  }
  .doc-panel {
    position: static;
    order: 2;
  }
  .menu-panel {
    order: 1;
  }
}

/* ---------- LOADING ---------- */
.loading {
  color: #0f0;
  opacity: 0.75;
  font-size: 1.1em;
  padding: 20px;
}

/* ---------- MENU LINKS ---------- */
#menuGrid a {
color: #0f0;
font-size: 1.5em;
text-decoration: none;
padding: 40px 20px;
border: 3px solid #0f0;
border-radius: 20px;
display: block;
background: transparent;
box-shadow: 0 0 15px #0f0;
transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
will-change: transform, box-shadow;
}

#menuGrid a:hover {
transform: scale(1.05) translateY(-8px);
box-shadow: 0 0 50px #0f0, 0 0 70px #0ff;
}

/* ---------- GLITCH EFFECTS ---------- */
@keyframes borderColorCycle {
  0%   { border-image-source: linear-gradient(45deg, #0f0, #0ff); }
  50%  { border-image-source: linear-gradient(45deg, #f0f, #ff0, #0ff); }
  100% { border-image-source: linear-gradient(45deg, #0f0, cyan); }
}

@keyframes menuPulse {
  0%, 100% { box-shadow: 0 0 18px rgba(0, 255, 0, 0.35); }
  50% { box-shadow: 0 0 30px rgba(0, 255, 0, 0.6); }
}

@keyframes neonFlicker {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 15px #0f0;
    border-color: #0f0;
  }
  10% {
    opacity: 0.7;
    box-shadow: 0 0 40px #0ff;
    border-color: #0ff;
  }
  20% {
    opacity: 1;
    box-shadow: 0 0 20px #0f0;
  }
  30% {
    opacity: 0.6;
    box-shadow: 0 0 60px #f0f;
    border-color: #f0f;
  }
  50% {
    opacity: 0.9;
    box-shadow: 0 0 30px #0f0;
  }
  70% {
    opacity: 0.8;
    box-shadow: 0 0 50px #0ff;
    border-color: #0ff;
  }
}

/* ---------- GLITCH STATE ---------- */
#menuGrid.glitching a {
  border-color: #0ff;
  animation: menuPulse 0.9s ease;
}

#menuGrid.glitching a::after {
  display: none;
}