* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --groen:       #8cbd00;
  --groen-hover: #a0d900;
  --groen-dim:   #6a9100;
  --zwart:       #0a0a0a;
  --zwart-card:  #111111;
  --zwart-border:#1e1e1e;
  --tekst:       #e8e8e8;
  --tekst-dim:   #999999;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--zwart);
  color: var(--tekst);
  min-height: 100vh;
}

/* Header */
header {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 24px 16px;
  background: #000;
  border-bottom: 2px solid var(--groen);
  gap: 12px;
}

header .logo-wrap img {
  height: 90px;
  display: block;
}

header nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

header nav a {
  color: var(--tekst-dim);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.5px;
  transition: color .2s;
}

header nav a:hover {
  color: var(--groen);
}

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px;
}

.hero h2 {
  font-size: 32px;
  color: var(--groen);
  margin-bottom: 12px;
}

.hero p {
  color: var(--tekst-dim);
  margin-bottom: 28px;
  font-size: 16px;
  letter-spacing: 1px;
}

/* Cards */
.card {
  background: var(--zwart-card);
  border: 1px solid var(--zwart-border);
  padding: 24px;
  margin: 16px auto;
  border-radius: 12px;
  max-width: 600px;
  width: 90%;
}

.card h2 { color: var(--groen); margin-bottom: 12px; }
.card h3 { color: var(--groen-dim); margin: 14px 0 6px; }
.card p  { margin-bottom: 8px; color: #ccc; line-height: 1.6; }

/* Buttons */
.btn, button {
  display: inline-block;
  background: var(--groen);
  color: #000;
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  margin-top: 12px;
  width: 100%;
  text-align: center;
  transition: background .2s, transform .1s;
}

.btn:hover, button:hover {
  background: var(--groen-hover);
  transform: translateY(-1px);
  text-decoration: none;
  color: #000;
}

/* Inputs */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="file"],
input:not([type]),
textarea {
  width: 100%;
  padding: 11px 14px;
  margin-top: 10px;
  background: #000;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
  color: var(--tekst);
  font-size: 15px;
  transition: border-color .2s;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--groen);
}

input::placeholder { color: #555; }

/* Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin-top: 10px;
  display: block;
}

/* Links */
a { color: var(--groen); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Page titles */
h1 { padding: 24px 24px 0; font-size: 26px; color: var(--groen); }

hr { border: none; border-top: 1px solid var(--zwart-border); margin: 16px 0; }

ul { padding-left: 20px; margin: 10px 0; }
ul li { margin-bottom: 8px; color: #ccc; }

.card strong { color: var(--groen); }

.error   { color: #ff5555; margin-top: 8px; }
.success { color: var(--groen); margin-top: 8px; }

@media (max-width: 768px) {
  header .logo-wrap img { height: 65px; }
  .hero { padding: 50px 20px; }
  .hero h2 { font-size: 22px; }
  h1 { font-size: 20px; }
}