/* Reference solution - only uses properties covered in class */

body {
  background: #f2f5ff;
  color: #1f2430;
  font-family: system-ui, sans-serif;
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
}

.card {
  text-align: center;
  padding: 24px;
}

.avatar {
  width: 120px;
  border-radius: 50%;
  border: 4px solid #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

h1 {
  margin: 12px 0 4px;
}

h2 {
  border-left: 5px solid #1e3a8a;
  padding-left: 10px;
  margin-top: 32px;
}

.hobbies {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hobby {
  flex: 1;
  min-width: 140px;
  text-align: center;
  background: #ffffff;
  padding: 16px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s;
}

.hobby:hover {
  transform: scale(1.05);
}

a {
  color: #1e3a8a;
}

button {
  font-size: 16px;
  padding: 10px 18px;
  margin: 24px 8px 0 0;
  border: none;
  border-radius: 999px;
  background: #1e3a8a;
  color: #ffffff;
  cursor: pointer;
  transition: opacity 0.2s;
}

button:hover {
  opacity: 0.85;
}

/* ===== Dark theme: JS only adds the "dark" class to body ===== */

body.dark {
  background: #1a1a2e;
  color: #f2f2f2;
}

body.dark .hobby {
  background: #2a2a44;
}

body.dark h2 {
  border-left-color: #8ab4ff;
}

body.dark a {
  color: #8ab4ff;
}

body.dark button {
  background: #8ab4ff;
  color: #1a1a2e;
}