/* ── SIDEBAR ── */
.sidebar {
  position: fixed;
  top: calc(var(--ticker-h) + var(--header-h));
  left: 0; bottom: 0;
  width: var(--sidebar-w);
  padding: 20px 14px;
  overflow-y: auto;
  background: rgba(11,13,18,0.85);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  z-index: 20;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.sidebar { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
.side-nav {
  --nav-active: var(--cyan);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.side-nav + .side-nav { margin-top: 22px; }
.side-nav__label {
  --label-accent: var(--neon-core);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  padding: 0 4px 0 10px;
  font-family: var(--font-body);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  white-space: nowrap;
  color: #F2F4F8;
  text-shadow: 0 0 10px rgba(var(--label-accent),.45);
}
.side-nav__label::before {
  content: "";
  flex: none; width: 4px; height: 14px;
  border-radius: 2px;
  background: rgb(var(--label-accent));
  box-shadow: 0 0 6px rgb(var(--label-accent)), 0 0 14px rgba(var(--label-accent),.7);
}
.side-nav__label::after {
  content: "";
  flex: 1; height: 1px; min-width: 24px;
  background: linear-gradient(90deg, rgba(var(--label-accent),.75), rgba(var(--label-accent),0));
  box-shadow: 0 0 6px rgba(var(--label-accent),.5);
}
.side-nav__item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 46px;
  margin-right: 6px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid transparent;
  color: #AEB4C2;
  font-size: 15px;
  font-weight: 500;
  overflow: hidden;
  cursor: pointer;
  transition:
    transform .28s cubic-bezier(.22,1,.36,1),
    background .25s ease, border-color .25s ease,
    color .25s ease, box-shadow .25s ease;
}
.side-nav__item::before {
  content: "";
  position: absolute;
  left: 0; top: 18%; bottom: 18%;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: rgb(var(--nav-active));
  box-shadow: 0 0 8px rgb(var(--nav-active));
  transform: scaleY(0);
  transition: transform .28s cubic-bezier(.22,1,.36,1);
}
.side-nav__icon { flex: none; width: 21px; height: 21px; color: var(--text-muted); transition: color .25s ease, filter .25s ease, transform .28s cubic-bezier(.22,1,.36,1); }
/* button reset */
button.side-nav__item {
  width: calc(100% - 6px);
  text-align: left;
  font-family: var(--font-body);
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  outline: none;
}
.side-nav__text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side-nav__item:hover {
  color: #FFF; font-weight: 600;
  transform: translateX(6px);
  background: linear-gradient(90deg, rgba(var(--nav-active),.12), rgba(var(--nav-active),.03));
  border-color: rgba(var(--nav-active),.18);
  box-shadow: 0 6px 18px rgba(0,0,0,.35);
}
.side-nav__item:hover::before { transform: scaleY(1); }
.side-nav__item:hover .side-nav__icon { color: rgb(var(--nav-active)); filter: drop-shadow(0 0 4px rgba(var(--nav-active),.7)); transform: scale(1.08); }
.side-nav__item.is-active {
  color: rgb(140,250,255); font-weight: 600;
  border-color: rgba(var(--nav-active),.75);
  background: linear-gradient(90deg, rgba(var(--nav-active),.32), rgba(var(--nav-active),.12));
  box-shadow: 0 0 0 1px rgba(var(--nav-active),.15), 0 0 14px rgba(var(--nav-active),.35), inset 0 0 12px rgba(var(--nav-active),.15);
  text-shadow: 0 0 8px rgba(var(--nav-active),.6);
}
.side-nav__item.is-active .side-nav__icon { color: #FFF; filter: drop-shadow(0 0 4px rgba(var(--nav-active),.9)); }
.side-nav__item.is-active::before { display: none; }
@media (max-width: 768px) {
  .side-nav__label, .side-nav__text { display: none; }
  .side-nav__item { justify-content: center; padding: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .side-nav__item, .side-nav__item::before, .side-nav__icon { transition: none; }
  .side-nav__item:hover, .side-nav__item:active { transform: none; }
}

/* ── Nhóm thu gọn được (tiêu đề bấm để thu / mở) ── */
button.side-nav__toggle {
  width: 100%; border: 0; background: transparent; cursor: pointer; text-align: left;
  -webkit-appearance: none; appearance: none;
}
.side-nav__toggle > span { flex: none; }
.side-nav__toggle:hover > span { color: #fff; }
.side-nav__toggle:focus-visible { outline: 1px solid rgba(var(--cyan),.5); outline-offset: 2px; border-radius: 6px; }
.side-nav__group { display: flex; flex-direction: column; gap: 4px; }
.side-nav.is-collapsed .side-nav__group { display: none; }

/* ── Nút Tracker cố định dưới cùng sidebar: neon đỏ luôn sáng (không cần rê chuột), chưa gắn chức năng ── */
.sidebar { display: flex; flex-direction: column; }
.side-foot {
  margin-top: auto; flex: none; position: sticky; bottom: 0;
  display: flex; align-items: center; gap: 14px; min-height: 46px; margin-right: 6px; padding: 0 14px;
  width: calc(100% - 6px); border-radius: 12px; text-decoration: none; cursor: default; text-align: left; -webkit-appearance: none; appearance: none;
  color: #ff4d6d; font-family: var(--font-body); font-size: 15px; font-weight: 700; letter-spacing: .3px;
  border: 1px solid rgba(var(--neon-core),.8);
  background: linear-gradient(90deg, rgba(var(--neon-core),.28), rgba(var(--neon-core),.1));
  box-shadow: 0 0 0 1px rgba(var(--neon-core),.15), 0 0 14px rgba(var(--neon-core),.45), inset 0 0 12px rgba(var(--neon-core),.18);
  text-shadow: 0 0 8px rgba(var(--neon-core),.8);
  transition: box-shadow .25s ease, background .25s ease;
}
.side-foot .side-nav__icon { color: #ff4d6d; filter: drop-shadow(0 0 4px rgba(var(--neon-core),.9)); }
.side-foot:hover, .side-foot:focus-visible {
  outline: none;
  background: linear-gradient(90deg, rgba(var(--neon-core),.4), rgba(var(--neon-core),.16));
  box-shadow: 0 0 0 1px rgba(var(--neon-core),.25), 0 0 22px rgba(var(--neon-core),.65), inset 0 0 14px rgba(var(--neon-core),.25);
}
@media (max-width: 768px) { .side-foot { justify-content: center; padding: 0; } }