:root {
  --blue: #0b5fa5;
  --blue-dark: #08406e;
  --bg: #f5f7fa;
  --border: #d7dde3;
  --text: #1b2530;
  --danger: #b3261e;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

header.topbar {
  background: var(--blue);
  color: #fff;
  padding: 0.9rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

header.topbar a { color: #fff; text-decoration: none; }
header.topbar .brand { font-weight: 700; font-size: 1.15rem; }

nav.mainnav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

nav.mainnav a {
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
}
nav.mainnav a:hover, nav.mainnav a.active { background: rgba(255,255,255,0.18); }

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

h1 { font-size: 1.5rem; margin-top: 0; }
h2 { font-size: 1.2rem; }

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
}

label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.25rem; }

input, select, button {
  font: inherit;
}

input[type=text], input[type=email], input[type=password], input[type=number], select {
  width: 100%;
  padding: 0.55rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}

button, .btn {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border: none;
  border-radius: 6px;
  background: var(--blue);
  color: #fff;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
}
button:hover, .btn:hover { background: var(--blue-dark); }
button.secondary { background: #6b7785; }
button.danger { background: var(--danger); }

form .field { margin-bottom: 0.8rem; }

.alert {
  padding: 0.7rem 0.9rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.92rem;
}
.alert.error { background: #fdecea; color: var(--danger); border: 1px solid #f5c6c2; }
.alert.success { background: #e8f5e9; color: #1b5e20; border: 1px solid #c3e6c5; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th, td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th { background: #eef2f6; position: sticky; top: 0; }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.pagination {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.muted { color: #5c6b78; font-size: 0.85rem; }

.actions-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 0.75rem 0; }

@media (max-width: 600px) {
  header.topbar { flex-direction: column; align-items: flex-start; }
  h1 { font-size: 1.25rem; }
  table, thead, tbody, th, td, tr { display: block; }
  thead tr { position: absolute; top: -9999px; left: -9999px; }
  tbody tr {
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 0.6rem;
    padding: 0.4rem 0.6rem;
    background: #fff;
  }
  td {
    border: none;
    padding: 0.25rem 0;
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
  }
  td::before {
    content: attr(data-label);
    font-weight: 700;
    color: #445;
    flex-shrink: 0;
  }
}