/* ══════════════════════════════════════════════════════════
   NAV SIDEBAR — Zalo Hub V3
   Zalo PC Style: Icon-only by default, hover to expand
   ══════════════════════════════════════════════════════════ */

/* ── Nav Sidebar Container ── */
.nav-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--nav-collapsed);
  background: #005AE0;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: width 0.2s ease;
  overflow: hidden;
}

/* Expanded state (via hover on desktop or toggle) */
.nav-sidebar.expanded {
  width: var(--nav-width);
}

/* ── Logo Area ── */
.nav-logo {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  flex-shrink: 0;
}
.nav-logo-icon {
  background: rgba(255,255,255,0.2);
  color: #fff;
  font-weight: 800;
  font-style: italic;
  border-radius: var(--radius-sm);
  padding: 3px 10px;
  font-size: 15px;
  letter-spacing: -0.5px;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-logo-text {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: rgba(255,255,255,0.95);
  white-space: nowrap;
  overflow: hidden;
}

/* ── Nav Menu Items ── */
.nav-menu {
  flex: 1;
  padding: 8px 6px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border-radius: var(--radius-md);
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
  overflow: hidden;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.nav-item:hover {
  background: rgba(255,255,255,0.15);
  color: #FFFFFF;
}
.nav-item.active {
  background: rgba(255,255,255,0.2);
  color: #FFFFFF;
  font-weight: 600;
}
.nav-item svg,
.nav-item i {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}
.nav-item-label {
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-item .nav-badge {
  margin-left: auto;
  background: #E74C3C;
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  min-width: 18px;
  height: 18px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
  flex-shrink: 0;
}

/* ── Divider ── */
.nav-divider {
  height: 1px;
  background: rgba(255,255,255,0.12);
  margin: 6px 12px;
}

/* ── Section Label ── */
.nav-section-label {
  padding: 8px 12px 4px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.4);
  white-space: nowrap;
  overflow: hidden;
}

/* ── Collapse Toggle (bottom) ── */
.nav-footer {
  padding: 8px 6px;
  border-top: 1px solid rgba(255,255,255,0.12);
  flex-shrink: 0;
}
.nav-collapse-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 8px;
  border: none;
  background: none;
  color: rgba(255,255,255,0.5);
  cursor: pointer;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  transition: all 0.15s ease;
}
.nav-collapse-btn:hover {
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.9);
}
.nav-collapse-btn svg {
  transition: transform 0.2s ease;
}

/* ══ DEFAULT (COLLAPSED/ICON-ONLY) STATE ══ */
/* By default sidebar is icon-only (collapsed) */
.nav-sidebar:not(.expanded) .nav-logo-text,
.nav-sidebar:not(.expanded) .nav-item-label,
.nav-sidebar:not(.expanded) .nav-badge,
.nav-sidebar:not(.expanded) .nav-section-label,
.nav-sidebar:not(.expanded) .nav-collapse-label {
  display: none;
}
.nav-sidebar:not(.expanded) .nav-item {
  justify-content: center;
  padding: 11px;
}
.nav-sidebar:not(.expanded) .nav-logo {
  justify-content: center;
  padding: 0 8px;
}
.nav-sidebar:not(.expanded) .nav-collapse-btn svg {
  transform: rotate(180deg);
}

/* ══ MAIN CONTENT OFFSET ══ */
.app-shell {
  margin-left: var(--nav-collapsed);
  transition: margin-left 0.2s ease;
  min-height: 100vh;
}
.nav-sidebar.expanded ~ .app-shell,
body.nav-expanded .app-shell {
  margin-left: var(--nav-width);
}

/* ══ RESPONSIVE ══ */

/* Tablet: always icon-only */
@media (max-width: 1024px) {
  .nav-sidebar {
    width: var(--nav-collapsed) !important;
  }
  .nav-sidebar .nav-logo-text,
  .nav-sidebar .nav-item-label,
  .nav-sidebar .nav-badge,
  .nav-sidebar .nav-section-label,
  .nav-sidebar .nav-collapse-label {
    display: none !important;
  }
  .nav-sidebar .nav-item {
    justify-content: center;
    padding: 11px;
  }
  .nav-sidebar .nav-logo {
    justify-content: center;
    padding: 0 8px;
  }
  .app-shell {
    margin-left: var(--nav-collapsed) !important;
  }
}

/* Mobile: overlay sidebar hidden by default */
@media (max-width: 768px) {
  .nav-sidebar {
    transform: translateX(-100%);
    width: var(--nav-width) !important;
    box-shadow: var(--shadow-lg);
  }
  .nav-sidebar.mobile-open {
    transform: translateX(0);
  }
  /* Show all labels when mobile sidebar is open */
  .nav-sidebar.mobile-open .nav-logo-text,
  .nav-sidebar.mobile-open .nav-item-label,
  .nav-sidebar.mobile-open .nav-badge,
  .nav-sidebar.mobile-open .nav-section-label,
  .nav-sidebar.mobile-open .nav-collapse-label {
    display: initial !important;
  }
  .nav-sidebar.mobile-open .nav-item {
    justify-content: flex-start !important;
    padding: 11px 12px !important;
  }
  .nav-sidebar.mobile-open .nav-logo {
    justify-content: flex-start !important;
    padding: 0 16px !important;
  }
  .app-shell {
    margin-left: 0 !important;
  }
  /* Overlay backdrop */
  .nav-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
  }
  .nav-sidebar.mobile-open ~ .nav-backdrop {
    display: block;
  }
}

/* ── Hamburger button for mobile ── */
.nav-hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  color: var(--color-text);
  cursor: pointer;
  border-radius: var(--radius-sm);
}
.nav-hamburger:hover {
  background: var(--color-surface-hover, #F0F2F5);
}
@media (max-width: 768px) {
  .nav-hamburger {
    display: flex;
  }
}