:root{
  --primary:#84cc16;
  --secondary:#bef264;
  --accent:#fef9c3;
  --ink:#0f172a;
  --muted:#64748b;
  --card:#f8fafc;
}
html{ scroll-behavior:smooth; }
body{
  font-family:'Inter', sans-serif;
  color:var(--ink);
  background:#ffffff;
}
::selection{ background: var(--secondary); color:var(--ink); }
::-webkit-scrollbar{ width:9px; height:9px; }
::-webkit-scrollbar-track{ background:transparent; }
::-webkit-scrollbar-thumb{ background:#d9f99d; border-radius:9999px; }
::-webkit-scrollbar-thumb:hover{ background:var(--primary); }

/* navbar */
#navbar{ transition: background-color .3s ease, backdrop-filter .3s ease, box-shadow .3s ease; }
#navbar.scrolled{
  background-color: rgba(255,255,255,0.82);
  backdrop-filter: blur(14px) saturate(180%);
  box-shadow: 0 4px 20px -10px rgba(15,23,42,0.12);
}

/* sidebar */
#sidebar{ scrollbar-gutter: stable; }
.nav-item{
  display:flex; align-items:center; gap:8px;
  padding:7px 12px; border-radius:10px;
  font-size:14px; font-weight:500; color:var(--muted);
  transition: background-color .18s ease, color .18s ease, transform .18s ease;
  position:relative;
}
.nav-item:hover{ background: rgba(132,204,22,0.08); color:var(--ink); transform: translateX(2px); }
.nav-item.active{
  background: linear-gradient(90deg, rgba(132,204,22,0.14), rgba(190,242,100,0.08));
  color: #3f6212;
  font-weight:600;
}
.nav-item.active::before{
  content:'';
  position:absolute; left:-1px; top:50%; transform:translateY(-50%);
  width:3px; height:60%;
  background: var(--primary);
  border-radius:9999px;
}
.nav-section-label{
  font-size:11px; font-weight:700; letter-spacing:.08em; text-transform:uppercase;
  color: #9ca3af; padding: 18px 12px 6px;
}

/* content typography & elements */
#content h1{
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -.025em;
  margin-bottom: 1.25rem;
  line-height: 1.2;
  color: var(--ink);
}

#content h2{
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.25rem;
  margin-bottom: 1rem;
  letter-spacing: -.015em;
  scroll-margin-top: 90px;
  color: var(--ink);
  border-bottom: 1px solid rgba(15,23,42,0.06);
  padding-bottom: 0.5rem;
}

#content h3{
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  scroll-margin-top: 90px;
  color: var(--ink);
}

#content p{
  color: #334155;
  line-height: 1.8;
  margin-bottom: 1.25rem;
  font-size: 15.5px;
}

#content ul, #content ol{
  margin: 0 0 1.25rem 1.4rem;
  color: #334155;
  line-height: 1.8;
  font-size: 15.5px;
}
#content ul{ list-style: disc; }
#content ol{ list-style: decimal; }
#content li{ margin-bottom: 0.4rem; }

#content a{
  color: #4d7c0f;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: rgba(132,204,22,0.4);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s ease, color 0.2s ease;
}
#content a:hover{
  text-decoration-color: var(--primary);
  color: #365314;
}

#content strong{ font-weight: 700; color: var(--ink); }

#content code{
  background: #f1f5f9;
  color: #0f172a;
  border: 1px solid rgba(15,23,42,0.08);
  padding: 0.2em 0.45em;
  border-radius: 6px;
  font-size: 0.88em;
  font-family: 'JetBrains Mono', monospace;
}

#content pre{
  background: #0f172a;
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 20px 40px -20px rgba(15,23,42,0.35);
  border: 1px solid rgba(255,255,255,0.05);
}
#content pre code{
  background: transparent;
  color: #e2e8f0;
  padding: 0;
  border: none;
  font-size: 13.5px;
  line-height: 1.7;
}

/* Styled Blockquotes & GitHub-style Alerts */
#content blockquote{
  border-left: 4px solid var(--primary);
  background: rgba(190,242,100,0.12);
  padding: 1rem 1.25rem;
  border-radius: 0 0.85rem 0.85rem 0;
  color: #334155;
  margin: 1.25rem 0;
  font-size: 15px;
}
#content blockquote p{ margin-bottom: 0; }
#content blockquote h3{ margin-top: 0; margin-bottom: 0.5rem; font-size: 1.05rem; }

#content hr{ border: none; border-top: 1px solid rgba(15,23,42,0.08); margin: 2.25rem 0; }

#content table{
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-size: 14.5px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(15,23,42,0.08);
}
#content th, #content td{
  border: 1px solid rgba(15,23,42,0.08);
  padding: 0.75rem 1rem;
  text-align: left;
}
#content th{
  background: #f8fafc;
  font-weight: 700;
  color: var(--ink);
}

#content p[align="center"] {
  text-align: center;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 1rem;
  margin-bottom: 1rem;
}
#content img {
  display: inline-block;
  vertical-align: middle;
  transition: transform 0.2s ease;
}
#content p[align="center"] img:hover {
  transform: translateY(-2px);
}

/* fade transition between pages */
#content{ animation: content-in .35s ease; }
@keyframes content-in{ from{ opacity:0; transform:translateY(8px);} to{ opacity:1; transform:translateY(0);} }

/* TOC */
.toc-link{
  display:block; font-size:13px; color:var(--muted); padding:5px 0 5px 14px;
  border-left:2px solid rgba(15,23,42,0.08);
  transition: color .18s ease, border-color .18s ease;
}
.toc-link:hover{ color:var(--ink); }
.toc-link.active{ color:#3f6212; font-weight:600; border-color: var(--primary); }
.toc-link.toc-h3{ padding-left:24px; font-size:12.5px; }

/* search */
#sidebar-search{ transition: box-shadow .2s ease, border-color .2s ease; }
#sidebar-search:focus{ box-shadow: 0 0 0 3px rgba(132,204,22,0.18); border-color: var(--primary); }

/* mobile sidebar drawer */
#sidebar-overlay{ transition: opacity .25s ease; }
@media (max-width: 1023px){
  #sidebar{
    position:fixed; top:0; left:0; bottom:0; z-index:50;
    width:280px; transform: translateX(-100%);
    transition: transform .3s cubic-bezier(.22,.68,0,1.01);
    background:#fff; box-shadow: 20px 0 60px -20px rgba(15,23,42,0.25);
  }
  #sidebar.open{ transform: translateX(0); }
}

.skeleton{ background: linear-gradient(90deg, #f1f5f9 25%, #eef2e0 37%, #f1f5f9 63%); background-size:400% 100%; animation: skeleton 1.4s ease infinite; border-radius:8px; }
@keyframes skeleton{ 0%{background-position:100% 50%;} 100%{background-position:0 50%;} }

@media (prefers-reduced-motion: reduce){ *{ animation:none !important; transition:none !important; } }