* {
  box-sizing: border-box;
}
body {
  max-width: 1100px;
  margin: 28px auto;
  padding: 0 24px;
  color: #243038;
  background: #fffdf8;
  font: 17px/1.75 "Microsoft YaHei", sans-serif;
}
h1, h2, h3 {
  color: #77382b;
  line-height: 1.4;
}
a {
  color: #125d79;
}
img, video {
  max-width: 100%;
  height: auto;
}
img {
  display: block;
}
video {
  display: block;
  margin-bottom: 16px;
}
button, input, select {
  font: inherit;
}
button {
  cursor: pointer;
  padding: 8px 16px;
}
input, select {
  padding: 6px;
}
label {
  display: inline-block;
  margin: 8px 12px 8px 0;
}
fieldset {
  margin: 16px 0;
  padding: 18px;
  border: 1px solid #b4c4c7;
}
figure {
  margin: 12px 0;
}
figcaption, .note {
  color: #526367;
}
.task-hint {
  padding: 8px 12px;
  border-left: 3px solid #c39956;
  background: #f6eddf;
  font-size: 14px;
}
.cards {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}
.card {
  display: block;
  width: 280px;
  padding: 14px;
  border: 1px solid #b4c4c7;
  background: white;
}
.card img {
  width: 100%;
}
.media-row {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}
.media-row > img {
  width: 40%;
}
.media-row > div {
  flex: 1;
  min-width: 0;
}
pre {
  overflow-x: auto;
  background: #edf3f4;
  padding: 16px;
}
code {
  font-family: Consolas, monospace;
}
table {
  width: 100%;
  border-collapse: collapse;
}
td, th {
  border: 1px solid #b4c4c7;
  padding: 10px;
  text-align: left;
  overflow-wrap: anywhere;
}
summary {
  cursor: pointer;
  font-weight: bold;
}
details {
  margin: 16px 0;
}
dt {
  font-weight: bold;
}
dd {
  margin-left: 20px;
}
.panel {
  padding: 24px;
  border: 1px solid #9cb2bc;
}
[hidden] {
  display: none !important;
}
:focus-visible {
  outline: 3px solid #007b91;
  outline-offset: 3px;
}
@media (max-width: 600px) {
  body {
    padding: 0 14px;
  }
  .media-row {
    flex-direction: column;
  }
  .media-row > img {
    width: 100%;
  }
}
@media print {
  body {
    max-width: none;
    margin: 0;
    font-size: 11pt;
  }
  pre {
    white-space: pre-wrap;
  }
}