/* ===========================
   GLOBAL VARIABLES
=========================== */
:root {
  --color-bg: #f4f6f9;
  --color-text: #2d3436;
  --color-nav: #1e293b;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-danger: #ef4444;
  --color-danger-dark: #dc2626;
  --color-muted: #64748b;
  --color-border: #e5e7eb;
  --radius: 6px;
  --transition: 0.25s ease;
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 6px 18px rgba(0, 0, 0, 0.12);
}

/* ===========================
   GLOBAL STYLES
=========================== */
body {
  background: var(--color-bg);
  font-family: "Inter", "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--color-text);
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition);
}

/* ===========================
   NAVBAR
=========================== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-nav);
  padding: 14px 28px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-left .logo {
  height: 38px;
  margin-right: 10px;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.navbar-center .nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius);
  color: #cbd5e1;
  transition: background var(--transition), color var(--transition);
}
.navbar-center .nav-link:hover,
.navbar-center .nav-link:focus {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  outline: none;
}
.navbar-center .nav-link.active {
  color: #ffffff;
  background: var(--color-primary);
}

/* Responsive Navbar */
@media (max-width: 768px) {
  .navbar {
    flex-wrap: wrap;
    padding: 12px 20px;
  }
  .navbar-center {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
  }
}

/* ===========================
   USER INFO
=========================== */
.avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid #e2e8f0;
  object-fit: cover;
}

.btn-logout {
  background: var(--color-danger);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 6px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background var(--transition);
}
.btn-logout:hover,
.btn-logout:focus {
  background: var(--color-danger-dark);
  outline: none;
}

/* ===========================
   CARDS
=========================== */
.card {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card h5 {
  font-weight: 600;
  color: var(--color-nav);
  margin-bottom: 8px;
}

/* ===========================
   BUTTONS
=========================== */
.btn {
  border-radius: var(--radius);
  font-weight: 500;
  padding: 8px 16px;
  transition: background var(--transition), color var(--transition), border var(--transition);
  font-size: 0.9rem;
  cursor: pointer;
}

.btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-primary);
  border: none;
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-outline-secondary {
  border: 1px solid #64748b;
  color: #334155;
  background: transparent;
}
.btn-outline-secondary:hover {
  background: #f1f5f9;
  color: var(--color-nav);
}

/* ===========================
   BADGES
=========================== */
.badge {
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 8px;
  display: inline-block;
}
.badge.bg-danger { background: #fee2e2; color: var(--color-danger-dark); }
.badge.bg-success { background: #dcfce7; color: #16a34a; }
.badge.bg-info { background: #e0f2fe; color: #0284c7; }
.badge.bg-warning { background: #fef9c3; color: #ca8a04; }
.badge.bg-primary { background: #dbeafe; color: var(--color-primary-dark); }

/* ===========================
   FOOTER
=========================== */
.footer {
  text-align: center;
  padding: 16px 0;
  font-size: 0.85rem;
  color: var(--color-muted);
  border-top: 1px solid #e2e8f0;
  background: #f8fafc;
}

/* ===========================
   LOADER
=========================== */
.loader {
  width: 28px;
  height: 28px;
  border: 3px solid #e5e7eb;
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: auto;
}
@keyframes spin {
  100% { transform: rotate(360deg); }
}