body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(120deg, #f6f3fa 60%, #e6e0f7 100%);
  color: #2a223a;
  margin: 0;
  padding: 0;
}
.header {
  background: linear-gradient(90deg, #5f2c82 80%, #49a09d 120%);
  color: #fff;
  padding: 2.5rem 0 1.2rem 0;
  text-align: center;
  box-shadow: 0 2px 12px rgba(95,44,130,0.07);
  border-bottom-left-radius: 18px;
  border-bottom-right-radius: 18px;
}
.header h1 {
  margin: 0;
  font-size: 2.7rem;
  letter-spacing: 1.5px;
  font-weight: 700;
}
.header p {
  margin: 0.7rem 0 0 0;
  font-size: 1.25rem;
  color: #e0e6ed;
}
nav {
  background: #fff;
  box-shadow: 0 2px 8px rgba(95,44,130,0.03);
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid #e6e0f7;
  position: sticky;
  top: 0;
  z-index: 10;
}
nav a {
  color: #5f2c82;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.13rem;
  transition: color 0.2s, border-bottom 0.2s;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}
nav a:hover, nav a.active {
  color: #a259c6;
  border-bottom: 2px solid #a259c6;
}
.container {
  max-width: 950px;
  margin: 2.5rem auto;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 2px 18px rgba(95,44,130,0.08);
  padding: 2.2rem 2.7rem;
}
h2 {
  color: #a259c6;
  margin-top: 2.2rem;
  font-size: 1.6rem;
  border-bottom: 1px solid #e6e0f7;
  padding-bottom: 0.3rem;
}
pre, code {
  background: #2a223a;
  color: #f6f3fa;
  border-radius: 7px;
  padding: 0.7rem 1.2rem;
  font-size: 1.04rem;
  font-family: 'Fira Mono', 'Consolas', monospace;
  overflow-x: auto;
  line-height: 1.6;
}
pre {
  margin: 1.2rem 0;
  box-shadow: 0 2px 8px rgba(95,44,130,0.04);
}
code {
  padding: 0.2em 0.4em;
  font-size: 1em;
}
.callout {
  background: #f3eaff;
  border-left: 5px solid #a259c6;
  padding: 1.1rem 1.7rem;
  margin: 1.7rem 0;
  border-radius: 7px;
  color: #5f2c82;
  font-size: 1.08rem;
  box-shadow: 0 1px 4px rgba(162,89,198,0.04);
}
.callout.info {
  background: #e6e0f7;
  border-left: 5px solid #49a09d;
  color: #2a223a;
}
.callout.warning {
  background: #fbefff;
  border-left: 5px solid #ff9800;
  color: #7a4d00;
}
.callout.success {
  background: #e6ffe6;
  border-left: 5px solid #4caf50;
  color: #1b5e20;
}
footer {
  text-align: center;
  color: #b0b8c1;
  font-size: 0.97rem;
  margin: 3.5rem 0 1.2rem 0;
}
button, .btn {
  background: #a259c6;
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 0.5rem 1.2rem;
  font-size: 1.08rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: 0 1px 4px rgba(162,89,198,0.08);
}
button:hover, .btn:hover {
  background: #5f2c82;
}
hr {
  border: none;
  border-top: 1px solid #e6e0f7;
  margin: 2.5rem 0;
}
@media (max-width: 600px) {
  .container { padding: 1.1rem 0.7rem; }
  nav { gap: 1.1rem; }
  .header h1 { font-size: 1.3rem; }
  h2 { font-size: 1.1rem; }
  pre, code { font-size: 0.95rem; }
}