body {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
background: linear-gradient(180deg, #eceff1 0%, #e1f5fe 100%);
}

.conbody,
.concept,
article,
main {
  background: #ffffff;
  padding: 2rem;
  margin-bottom: 2rem;
  border-radius: 6px;
}


p, li {
  line-height: 1.6;
  text-align: justify;
}

h1 {
  text-align: center;
  margin-bottom: 1.5rem;
}

h2 {
  margin-top: 2.5rem;
  border-bottom: 1px solid #ddd;
  padding-bottom: 0.3rem;
}

h3 {
  margin-top: 1.5rem;
}

pre {
  background: #f5f5f5;
  padding: 1rem;
  border-left: 4px solid #ccc;
  overflow-x: auto;
}

code {
  background: #f0f0f0;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: Consolas, monospace;
}

img {
  display: block;
  margin: 1.5rem auto;
  max-width: 100%;
  border: 1px solid #ddd;
  background: #fff;
  padding: 6px;
  border-radius: 6px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.figure-caption {
  display: block;
  text-align: center;
  font-style: italic;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
  width: -moz-fit-content;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

th, td {
  border: 1px solid #ddd;
  padding: 0.6rem;
}

th {
  background-color: #f3f3f3;
  text-align: left;
}

.note {
  background: #e8f2ff;
  border-left: 4px solid #4a90e2;
  padding: 1rem;
}

.warning {
  background: #fff4e5;
  border-left: 4px solid #f5a623;
  padding: 1rem;
}

a {
  color: #0056b3;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 4rem;
  font-size: 0.9em;
  text-align: center;
  color: #777;
}