:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #142033;
  --muted: #5f6f86;
  --accent: #0a66c2;
  --danger: #bb1e2d;
  --border: #dbe3ee;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #eef4ff, var(--bg));
}

header {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

header h1 {
  margin: 0;
  font-size: 18px;
}

nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

nav a {
  text-decoration: none;
  color: var(--accent);
  font-weight: 600;
}

main {
  padding: 18px;
}

section,
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 14px;
  padding: 8px;
  vertical-align: top;
}

form {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

input,
select,
textarea,
button {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  font-size: 14px;
}

button {
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
}

button.secondary {
  background: #3d5068;
}

button.danger {
  background: var(--danger);
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

.kpi {
  background: #f3f7ff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
}

.kpi .value {
  font-size: 24px;
  font-weight: 700;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.login-card {
  width: 360px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.login-card form {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.error {
  color: var(--danger);
}

.mono {
  font-family: ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

@media (max-width: 760px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }
}