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

body {
  font-family: system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  background-color: #242424;
  color: #fff;
}

nav {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  padding: 1.2rem;
  background-color: #1a1a1a;
  border-bottom: 1px solid #333;
}

.nav-link {
  color: #888;
  text-decoration: none;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  transition: color 0.25s, background-color 0.25s;
}

.nav-link:hover {
  color: #fff;
}

.nav-link.active {
  color: #646cff;
  background-color: rgba(100, 108, 255, 0.1);
}

#app {
  max-width: 600px;
  margin: 3rem auto;
  text-align: center;
  padding: 0 1rem;
}

h1 {
  margin-bottom: 1.5rem;
  font-size: 2rem;
}

.card {
  margin-bottom: 1.5rem;
}

.card p + p {
  margin-top: 0.5rem;
}

button {
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid #646cff;
  border-radius: 8px;
  background-color: #1a1a1a;
  color: #fff;
  cursor: pointer;
  transition: border-color 0.25s;
}

button:hover {
  border-color: #535bf2;
}

input, textarea {
  display: block;
  width: 100%;
  padding: 0.6rem 0.8rem;
  margin-bottom: 0.8rem;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid #333;
  border-radius: 8px;
  background-color: #1a1a1a;
  color: #fff;
  outline: none;
  transition: border-color 0.25s;
}

input:focus, textarea:focus {
  border-color: #646cff;
}

textarea {
  resize: vertical;
}

#form-status {
  margin-top: 1rem;
  color: #4ade80;
}

p {
  color: #888;
}