body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}

.container {
  width: min(980px, 92%);
  margin: 1.25rem auto;
}

h1, h2, h3 {
  margin: 0.4rem 0;
}

nav {
  margin-top: 0.5rem;
}

nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #1d4ed8;
  font-weight: 600;
}

nav .nav-btn {
  background: #2563eb;
  color: #ffffff;
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
}

.card {
  background: #ffffff;
  border-radius: 10px;
  padding: 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: 1fr 1fr;
}

.grid-full {
  grid-column: 1 / -1;
}

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

input, select, textarea {
  width: 100%;
  padding: 0.6rem;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  box-sizing: border-box;
}

textarea {
  min-height: 100px;
}

.btn {
  display: inline-block;
  border: none;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  padding: 0.6rem 1rem;
  text-decoration: none;
  cursor: pointer;
  margin-top: 0.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

th, td {
  border: 1px solid #e5e7eb;
  padding: 0.5rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef2ff;
}

.msg {
  padding: 0.6rem;
  border-radius: 6px;
  margin: 0.75rem 0;
}

.msg-ok {
  background: #ecfdf5;
  border: 1px solid #10b981;
}

.msg-err {
  background: #fef2f2;
  border: 1px solid #ef4444;
}