:root {
  --brand-primary: #2563eb;
  --brand-dark: #1e3a5f;
  --brand-gradient: #1e3a5f;
  --header-shadow: 0 2px 16px rgba(30, 58, 95, 0.12);
  --color-bg: #eceef1;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #6c757d;
  --radius: 0.75rem;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  --transition: 0.2s ease;
}

body {
  background-color: var(--color-bg);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--color-text);
}

/* Navbar */
.navbar-main {
  background: var(--brand-gradient);
  box-shadow: var(--header-shadow);
  padding-top: 0.6rem;
  padding-bottom: 0.6rem;
  border: none;
}

.navbar-main .navbar-brand {
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transition: opacity 0.2s;
}

.navbar-main .navbar-brand:hover {
  opacity: 0.85;
}

.navbar-main .navbar-brand img {
  filter: brightness(0) invert(1);
}

/* Cards */
.card {
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow);
}

.card-header {
  background: var(--color-surface);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  font-weight: 600;
  padding: 1rem 1.25rem;
}

/* Sortable table headers */
th[data-sort] {
  user-select: none;
  transition: color var(--transition);
}

th[data-sort]:hover {
  color: var(--brand-dark);
}

/* Dashboard nav buttons */
.btn-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid rgba(0, 0, 0, 0.1);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition);
  width: 100%;
}

.btn-nav:hover {
  background: var(--brand-dark);
  color: #fff;
  border-color: var(--brand-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-nav:hover .btn-nav-icon {
  color: #fff;
}

.btn-nav-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
  background: rgba(37, 99, 235, 0.1);
  color: var(--brand-primary);
  font-size: 1rem;
  flex-shrink: 0;
  transition: all var(--transition);
}

.btn-nav-highlight {
  background: var(--brand-dark);
  color: #fff;
  border-color: var(--brand-dark);
}

.btn-nav-highlight .btn-nav-icon {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn-nav-highlight:hover {
  background: var(--brand-primary);
  border-color: var(--brand-primary);
}

.btn-nav-danger {
  background: #dc3545;
  color: #fff;
  border-color: #dc3545;
}

.btn-nav-danger .btn-nav-icon {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn-nav-danger:hover {
  background: #b02a37;
  border-color: #b02a37;
}

/* Tables */
.table {
  margin-bottom: 0;
}

.table th {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  border-bottom-width: 1px;
}

.table td {
  vertical-align: middle;
  padding: 0.75rem;
}

.table-hover tbody tr:hover {
  background-color: #f0f4ff;
}

/* DataTables overrides */
.dataTables_filter {
  margin-bottom: 1rem;
}

.dataTables_filter input {
  border-radius: var(--radius) !important;
  border: 2px solid #dee2e6 !important;
  padding: 0.625rem 1rem !important;
  font-size: 1rem !important;
  transition: border-color var(--transition), box-shadow var(--transition) !important;
  outline: none !important;
  margin-left: 0.5rem !important;
  min-width: 200px;
  width: 100%;
  max-width: 400px;
}

.dataTables_filter input:focus {
  border-color: var(--brand-primary) !important;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15) !important;
}

.dataTables_filter label {
  font-weight: 500;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
}

/* Badge styling */
.badge {
  font-weight: 500;
  padding: 0.35em 0.65em;
  font-size: 0.75rem;
  border-radius: 0.375rem;
}

/* Back button */
.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  padding: 0.6rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: 0.5rem;
  border: 1.5px solid #d1d5db;
  color: var(--color-text);
  background: var(--color-surface);
  transition: all var(--transition);
}

.btn-back:hover {
  background: var(--brand-dark);
  color: #fff;
  border-color: var(--brand-dark);
}

@media (max-width: 767.98px) {
  .btn-back {
    padding: 0.75rem 1.5rem;
    font-size: 1.05rem;
    width: 100%;
    justify-content: center;
  }
}

/* Section titles */
.section-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Responsive helpers */
@media (max-width: 767.98px) {
  .dataTables_filter input {
    min-width: 0 !important;
    max-width: 100% !important;
  }

  .dataTables_filter label {
    flex-direction: column;
    align-items: stretch;
  }

  .dataTables_filter input {
    margin-left: 0 !important;
    margin-top: 0.5rem !important;
  }

  .table-responsive-cards td,
  .table-responsive-cards th {
    font-size: 0.9rem;
  }
}

/* Verknúmer table – mobile fit (Öll verknúmer) */
#verknumer-table .col-nr {
  white-space: nowrap;
}

@media (max-width: 767.98px) {
  #verknumer-table .col-nr {
    width: 1%;
    min-width: 3.5rem;
    white-space: nowrap;
  }

  #verknumer-table .col-flokkur {
    width: 1%;
    min-width: 0;
    white-space: nowrap;
  }

  #verknumer-table.table-md-spacing td,
  #verknumer-table.table-md-spacing th {
    padding: 0.5rem 0.35rem;
    font-size: 0.875rem;
  }

  #verknumer-table .badge {
    font-size: 0.7rem;
    padding: 0.25em 0.5em;
  }
}

@media (min-width: 768px) {
  #verknumer-table.table-md-spacing td,
  #verknumer-table.table-md-spacing th {
    padding: 0.75rem;
  }

  #verknumer-table .col-nr {
    width: 100px;
  }

  #verknumer-table .col-flokkur {
    width: 130px;
  }
}

/* Category row highlight */
.row-category {
  background-color: rgba(25, 135, 84, 0.08) !important;
  font-weight: 600;
}

/* Footer */
.site-footer {
  background: var(--brand-dark);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.8rem;
  padding: 1.5rem 0;
  margin-top: 3rem;
  text-align: center;
}

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}