:root {
  --primary-color: #2563eb;
  --bg-color: #f8fafc;
  --text-color: #1e293b;
  --card-bg: #ffffff;

  /* Status Colors */
  --status-active: #10b981;
  --status-warning: #f59e0b;
  --status-maintenance: #ef4444;
  --status-decomm: #64748b;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* --- Header and Navigation --- */
.header {
  background-color: var(--card-bg);
  padding: 1rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.logo h1 {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

/* Burger Menu (Hidden on desktop) */
.burger-menu {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
}

.burger-menu span {
  width: 25px;
  height: 3px;
  background-color: var(--text-color);
  transition: all 0.3s ease;
}

/* --- Main Content & Grid --- */
.main-content {
  flex: 1;
  padding: 2rem 5%;
}

.catalog-section h2 {
  margin-bottom: 1.5rem;
}

/* Grid for Cards */
.equipment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* Cards */
.card {
  background-color: var(--card-bg);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Hover Animation */
.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h3 {
  font-size: 1.25rem;
}

.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: white;
}

.status-active {
  background-color: var(--status-active);
}
.status-warning {
  background-color: var(--status-warning);
}
.status-maintenance {
  background-color: var(--status-maintenance);
}
.status-decommissioned {
  background-color: var(--status-decomm);
}

.alert-icon {
  color: var(--status-warning);
}

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: #1d4ed8;
}

.btn-disabled {
  background-color: #e2e8f0;
  color: #94a3b8;
  cursor: not-allowed;
}

/* --- Footer --- */
.footer {
  background-color: #1e293b;
  color: white;
  text-align: center;
  padding: 1.5rem;
  margin-top: 2rem;
}

.footer a {
  color: #93c5fd;
  text-decoration: none;
}

/* --- Media Queries (Phone) --- */
@media (max-width: 768px) {
  /* Show burger menu */
  .burger-menu {
    display: flex;
  }

  /* Hide standard nav list */
  .nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    width: 100%;
    background-color: var(--card-bg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }

  /* Toggled state added via JavaScript */
  .nav.show {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-list li {
    text-align: center;
    padding: 1rem 0;
    border-bottom: 1px solid #f1f5f9;
  }
}