:root {
  --color-primary: #1D2B36;      /* Diep blauwgrijs */
  --color-accent: #2FA49D;       /* Tealgroen */
  --color-bg: #FAF7F1;           /* Zacht crème */
  --color-card: #EDEDED;         /* Lichtgrijs */
  --color-accent-dark: #1D6E6B;  /* Donker teal */
  --color-primary-lighter: #476A85; /* Lichter Diep blauwgrijs */
}

body {
  background: var(--color-bg);
  color: var(--color-primary);
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
}

header {
  background: var(--color-primary);
  color: var(--color-bg);
  padding: 20px 0 12px 0;
  text-align: center;
  margin-bottom: 0;
  border-bottom: 2px solid var(--color-accent);
}

.logo {
  max-width: 320px;
  height: auto;
  display: block;
  margin: 0 auto;
}

.container {
  display: flex;
  flex-direction: row-reverse;
  align-items: flex-start;
  max-width: 1100px;
  margin: 30px auto;
  gap: 36px;
  padding: 0 10px;
}

main {
  flex: 1 1 0;
  min-width: 0;
}

nav {
  background: var(--color-card);
  border-radius: 16px;
  padding: 28px 18px;
  min-width: 210px;
  max-width: 260px;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(29,43,54,0.05);
}

nav a {
  display: inline-block;
  color: var(--color-accent);
  font-weight: 500;
  padding: 3px 0;
  border-radius: 6px;
  transition: color .15s, background .15s;
}
nav a:hover, nav a:focus {
  color: var(--color-bg);
  background: var(--color-accent-dark);
  text-decoration: none;
}

nav .submenu {
  margin-left: 12px;
  font-size: 0.97em;
}

hr {
  border: none;
  border-top: 1.5px solid var(--color-accent);
  margin: 16px 0 10px 0;
}

.btn, input[type="submit"], button {
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 8px 22px;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1em;
  cursor: pointer;
  transition: background 0.15s;
  margin-top: 5px;
  margin-bottom: 6px;
  letter-spacing: 0.03em;
}
.btn:hover, input[type="submit"]:hover, button:hover {
  background: var(--color-accent-dark);
  color: var(--color-bg);
}

.card {
  background: var(--color-card);
  border-radius: 14px;
  padding: 28px 22px 22px 22px;
  box-shadow: 0 1.5px 8px rgba(29,43,54,0.09);
  margin-bottom: 24px;
}

input, select, textarea {
  border: 1.5px solid var(--color-card);
  border-radius: 8px;
  padding: 8px 12px;
  background: var(--color-bg);
  color: var(--color-primary);
  font-size: 1em;
  font-family: inherit;
  margin-bottom: 12px;
  outline: none;
  transition: border-color .14s;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--color-accent);
}

label {
  font-weight: 500;
  margin-bottom: 3px;
  display: inline-block;
  color: var(--color-primary);
}

.error {
  color: #a94442;
  background: #fff0ee;
  border-left: 5px solid #a94442;
  padding: 10px 16px;
  border-radius: 7px;
  margin-bottom: 18px;
}

.success {
  color: #317b3d;
  background: #ebfaef;
  border-left: 5px solid #317b3d;
  padding: 10px 16px;
  border-radius: 7px;
  margin-bottom: 18px;
}

table {
  border-collapse: collapse;
  width: 100%;
  background: var(--color-card);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 20px;
}

th, td {
  padding: 10px 16px;
  border-bottom: 1px solid #e0e0e0;
}

th {
  background: var(--color-accent);
  color: var(--color-bg);
  text-align: left;
}

tr:last-child td {
  border-bottom: none;
}

/* Responsive */
@media (max-width: 800px) {
  .container {
    flex-direction: column-reverse;
    gap: 10px;
  }
  nav {
    max-width: 100%;
    min-width: 0;
    margin-bottom: 18px;
  }
  main {
    padding: 0;
  }
}