* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Poppins', sans-serif;
}

/* Algemene stijl */
body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg-color);
  color: var(--text-main);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* header */
header {
  background: var(--card-bg);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100px;
  box-shadow: 0 4px 10px var(--shadow-color);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

header h1 {
  margin: 0;
  font-size: 2.2rem;
  font-weight: 600;
}

h2 {
  margin-bottom: 20px;
  color: var(--accent);
  font-weight: 600;
}

/* main layout */
.main-layout {
  display: flex;
  gap: 2rem;
  flex: 1;
  align-items: stretch;
  padding: 2rem;
  color: var(--text-main);
  max-width: 1200px;
  margin: 20px auto;
  width: 100%;
}

/* layout article */
.main-layout article {
  flex: 3;
  display: flex;
  flex-direction: column;
  border-radius: 12px;
  background: var(--card-bg);
  padding: 2.5rem;
  box-shadow: 0 4px 15px var(--shadow-color);
  line-height: 1.6;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

/* layout aside */
.main-layout aside {
  flex: 1;
  border-radius: 12px;
  background: var(--card-bg);
  padding: 2.5rem;
  box-shadow: 0 4px 15px var(--shadow-color);
  display: flex;
  flex-direction: column;
  text-align: left;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.main-layout aside p {
  color: var(--text-main);
  font-size: 1rem;
}

/* Contact formulier */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-color);
  color: var(--text-main);
  font-size: 1rem;
  transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
  outline: none;
}

.contact-form textarea {
  resize: vertical; /* Voorkomt dat het berichtenvak in de breedte uitrekt */
  max-width: 100%;
  min-height: 120px;
  max-height: 300px; /* Voorkomt dat hij eindeloos naar beneden wordt gerekt */
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-muted);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--shadow-hover);
}

.contact-form button {
  background: var(--accent);
  color: #fff;
  border: none;
  font-weight: 500;
  font-size: 1rem;
  padding: 14px 20px;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px var(--shadow-hover);
}

.contact-form button:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px var(--shadow-hover);
}

/* footer */
footer {
  width: 100%;
  background-color: var(--footer-bg);
  color: var(--text-muted);
  text-align: center;
  height: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: auto;
  transition: background-color 0.3s ease;
}

.hidden {
  display: none !important;
}

#successMessage {
  text-align: center;
  padding: 30px;
  background-color: var(--bg-color);
  border-radius: 12px;
  border: 1px solid var(--accent);
  box-shadow: 0 4px 15px var(--shadow-color);
  margin-top: 20px;
}

#successMessage h3 {
  color: var(--accent);
  margin-bottom: 15px;
}

#successMessage p {
  margin-bottom: 20px;
}

.back-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  font-weight: 500;
  font-size: 1rem;
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.back-btn:hover {
  background: var(--accent-hover);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .main-layout {
    flex-direction: column;
    padding: 1rem;
    gap: 1.5rem;
  }

  header h1 {
    font-size: 1.8rem;
  }
}