body {
  font-family: 'Segoe UI', sans-serif;
  font-size: 18px;
  line-height: 1.8;
  background: #eef2f5;
  margin: 0;
  padding: 0;
}
.slide {
  display: none;
  padding: 40px;
  min-height: 80vh;
  box-sizing: border-box;
  background: white;
  margin: 40px auto;
  max-width: 900px;
  width: calc(100% - 30px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  border-radius: 12px;
  position: relative;
}
.slide.active {
  display: block;
}
.nav {
  text-align: center;
  margin: 20px 0;
}
#slide-number {
  width: 60px;
  display: inline-block;
  color: #666;
}
button {
  padding: 10px 20px;
  font-size: 16px;
  margin: 0 10px;
  border: none;
  background: #007bff;
  color: white;
  border-radius: 5px;
  cursor: pointer;
}
button:hover {
  background: #0056b3;
}
h1 {
  font-size: 32px;
  color: #2a2a2a;
}
h2, h3 {
  color: #2a2a2a;
}
ul li {
  line-height: 1.6;
  margin-bottom: 8px;
}
ol li {
  line-height: 1.6;
  margin-bottom: 8px;
}
code {
  line-height: 1.6;
  color: #EB5757;
  background: rgb(237 237 235);
  padding: 0px 6px;
  border-radius: 4px;
  font-family: monospace;
  display: inline-block;
}
img {
  max-width: 100%;
  max-height: 360px;
  border-radius: 8px;
  display: block;
  margin: 16px auto;
}
a {
  color: #007bff;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}
th, td {
  border: 1px solid #ccc;
  padding: 8px;
  text-align: left;
}
th {
  background-color: #eee;
}
@media screen and (max-width: 767px) {
  .slide{
    padding: 30px;
  }  
}