/* ==========================================
   SIDEBAR VARS & BASE STYLES
   ========================================== */
:root {
  --sidebar-width: 260px;
  --sidebar-bg: #1e293b;        /* Dark Navy / Slate */
  --sidebar-hover: #334155;     /* Slightly lighter hover state */
  --sidebar-text: #94a3b8;      /* Soft light grey */
  --sidebar-active-bg: #2563eb;  /* Primary Blue Accent */
  --sidebar-active-text: #ffffff;
  --sidebar-border: rgba(255, 255, 255, 0.08);
}

/* Overlay Backdrop for Mobile */
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.sidebar-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Sidebar Box Container */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--sidebar-bg);
  z-index: 999;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
  overflow-y: auto;
}

/* Custom Scrollbar for Sidebar */
.sidebar::-webkit-scrollbar {
  width: 5px;
}
.sidebar::-webkit-scrollbar-thumb {
  background: var(--sidebar-hover);
  border-radius: 10px;
}

/* Mobile Close Button */
.sidebar-close {
  display: none;
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: var(--sidebar-text);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.5rem;
  transition: color 0.2s ease;
}

.sidebar-close:hover {
  color: var(--sidebar-active-text);
}

/* Brand/Logo Header */
.sidebar-brand {
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-logo-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
}

.sidebar-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.sidebar-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.5px;
}

/* Navigation List */
.sidebar-nav {
  padding: 1rem 0;
  flex: 1;
}

.sidebar-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-nav li {
  margin-bottom: 0.25rem;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.5rem;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s ease;
  border-left: 4px solid transparent;
}

.sidebar-nav a i {
  font-size: 1.1rem;
  width: 22px;
  text-align: center;
  transition: transform 0.2s ease;
}

.sidebar-nav a:hover {
  color: #ffffff;
  background-color: var(--sidebar-hover);
}

.sidebar-nav a:hover i {
  transform: translateX(2px);
}

/* Active Link State */
.sidebar-nav a.active {
  color: var(--sidebar-active-text);
  background-color: rgba(37, 99, 235, 0.15);
  border-left-color: var(--sidebar-active-bg);
  font-weight: 600;
}

.sidebar-nav a.active i {
  color: var(--sidebar-active-bg);
}

/* Logout Separation */
.sidebar-nav .logout-item {
  margin-top: 1.5rem;
  border-top: 1px solid var(--sidebar-border);
  padding-top: 0.5rem;
}

/* ==========================================
   RESPONSIVE (MOBILE & TABLET SLIDE-OUT)
   ========================================== */
@media (max-width: 992px) {
  .sidebar {
    transform: translateX(-100%); /* Off screen by default */
  }

  .sidebar.active {
    transform: translateX(0); /* Slide in */
  }

  .sidebar-close {
    display: block; /* Show close button on mobile */
  }
}