.tab-bar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 36px;
  background: rgba(9,9,11,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 70px;
  z-index: 100;
}
.tab-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 13px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
  margin-bottom: -1px;
}
.tab-btn:hover  { color: var(--text); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }

.tab-icon { font-size: 13px; line-height: 1; }
.tab-content-wrapper {
  grid-column: 1 / -1;
}
.tab-pane { display: none; }
#tab-packages.active {
  display: grid;
  grid-template-columns: 152px 1fr 300px;
  min-height: calc(100vh - 114px);
  align-items: start;
}
#tab-presets.active { display: block; }
.left-nav {
  position: sticky;
  top: 114px;
  height: calc(100vh - 114px);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 18px 0 24px;
  border-right: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}
.left-nav-title {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0 14px 12px;
  font-family: var(--mono);
}
.lnav-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 14px;
  text-decoration: none;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  border-left: 2px solid transparent;
  transition: color 0.1s, background 0.1s, border-color 0.1s;
  white-space: nowrap;
  cursor: pointer;
}
.lnav-link:hover {
  color: var(--text);
  background: var(--surface2);
}
.lnav-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-glow);
}
.lnav-icon { display: none; }
.lnav-label { flex: 1; }
.lnav-count {
  font-size: 9px;
  font-weight: 700;
  background: var(--accent2-dim);
  color: var(--accent2);
  border-radius: 8px;
  padding: 1px 5px;
  min-width: 18px;
  text-align: center;
  display: none;
}
.lnav-link.has-items .lnav-count { display: inline-block; }
.left-nav::-webkit-scrollbar { width: 2px; }
.left-nav::-webkit-scrollbar-thumb { background: var(--border-mid); }
@media (max-width: 1080px) {
  #tab-packages.active {
    grid-template-columns: 42px 1fr 260px;
  }
  .lnav-label, .lnav-count, .left-nav-title { display: none; }
  .lnav-link {
    padding: 9px 0;
    justify-content: center;
    gap: 0;
    border-left-width: 0;
    border-right: 2px solid transparent;
  }
  .lnav-link.active {
    border-right-color: var(--accent);
    border-left-color: transparent;
  }
}

@media (max-width: 720px) {
  #tab-packages.active {
    grid-template-columns: 1fr;
  }
  .left-nav {
    position: static;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px;
    padding: 10px 14px;
    border-right: none;
    border-bottom: 1px solid var(--border);
    overflow: visible;
  }
  .lnav-label  { display: inline !important; font-size: 10px; }
  .lnav-count  { display: none !important; }
  .left-nav-title { display: none; }
  .lnav-link {
    border-left: none;
    border-right: none;
    border-radius: 4px;
    padding: 4px 9px;
    font-size: 10px;
    gap: 5px;
    border: 1px solid transparent;
  }
  .lnav-link:hover { border-color: var(--border-mid); }
  .lnav-link.active {
    border-color: rgba(232,112,58,0.4);
    background: var(--accent-glow);
    border-left-color: rgba(232,112,58,0.4);
    border-right-color: rgba(232,112,58,0.4);
  }
}