body {
  font-family: "Lato", sans-serif;
  margin: 0;
}

.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 999;
  top: 0;
  left: 0;
  background: #111;
  overflow-x: hidden;
  padding-top: 60px;
  transition: width .3s ease;
}

.sidenav a {
  padding: 10px 32px;
  text-decoration: none;
  font-size: 18px;
  color: #bbb;
  display: block;
  transition: .2s;
}

.sidenav a:hover {
  color: #fff;
  background: #1f1f1f;
}

.sidenav .section-title {
  padding: 15px 32px 5px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #666;
}

.closebtn {
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 28px;
  cursor: pointer;
  color: white;
}

.menu-toggle {
  font-size: 26px;
  cursor: pointer;
  padding: 10px 15px;
  display: inline-block;
}

/* ===== Collapsible Sections ===== */

.nav-section {
    border-top: 1px solid #1f1f1f;
}

.section-title {
    padding: 14px 32px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #888;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section-title:hover {
    background: #1a1a1a;
}

.section-links {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.nav-section.open .section-links {
    max-height: 500px; /* enough for links */
}

.chevron {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.nav-section.open .chevron {
    transform: rotate(180deg);
}