* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: #f4fbff;
  color: #243447;
  text-align: center;
}

/* nav */
.topnav {
  background-color: #2e86ab;
  text-align: center;
  padding: 12px;
  border-bottom: 3px solid #f4b942;
}

.topnav a {
  color: white;
  text-decoration: none;
  padding: 10px 18px;
  display: inline-block;
  font-weight: bold;
  border-radius: 6px;
}

.topnav a:hover {
  background-color: #1f5f7a;
}

/* Main content */
.content {
  width: 90%;
  max-width: 950px;
  margin: 25px auto;
  padding: 20px;
  border: 3px solid #a8d8ea;
  background-color: #ffffff;
  border-radius: 12px;
  text-align: left;
}

h2 {
  color: #1f5f7a;
  margin-top: 0;
}

h3 {
  color: #f28c28;
}

p, li {
  line-height: 1.6;
  font-size: 16px;
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 15px auto;
}

audio {
  display: block;
  margin: 15px auto;
  width: 300px;
}

.image-border {
    border: 2px solid #a7315e;
}

/* sound buttons */
.sound-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin: 15px 0 25px 0;
}

.sound-row button {
  background-color: #f4b942;
  color: #243447;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
}

.sound-row button:hover {
  background-color: #f28c28;
  color: white;
}

/* word practice boxes */
.word-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  margin-top: 20px;
}

.word-card {
  width: 260px;
  background-color: #fdfdfd;
  border: 2px solid #a8d8ea;
  border-radius: 12px;
  padding: 15px;
  text-align: center;
}

.word-card img {
  width: 180px;
  height: 180px;
  object-fit: contain;
  display: block;
  margin: 0 auto 10px auto;
}

.word-card h3 {
  margin-top: 5px;
  color: #1f5f7a;
}

/* info box */
.fun-box {
  background-color: #fff4cc;
  border: 2px dashed #f4b942;
  padding: 15px;
  border-radius: 10px;
  margin: 20px 0;
}

.center-text {
  text-align: center;
}

footer {
  text-align: center;
  padding: 15px;
  background-color: #2e86ab;
  color: white;
  margin-top: 25px;
  font-size: 14px;
}