/*
 * 全站样式表
 * 从原 HTML 文件中提取的样式，负责整体页面的排版和配色。
 */

body {
  margin: 0;
  font-family: "Microsoft YaHei", Arial, sans-serif;
  background: linear-gradient(135deg, #eef7f2, #f8fbff);
  color: #223;
}
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px;
}
.card {
  background: #ffffff;
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  margin-top: 20px;
}
h1 {
  font-size: 26px;
  margin-bottom: 8px;
  color: #1f6f5b;
}
.subtitle {
  color: #607070;
  line-height: 1.6;
  margin-bottom: 20px;
}
input {
  width: 100%;
  padding: 12px;
  font-size: 17px;
  border: 1px solid #cfd8dc;
  border-radius: 10px;
  box-sizing: border-box;
  margin: 8px 0 14px;
}
button {
  padding: 12px 18px;
  font-size: 16px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background: #2f8f74;
  color: white;
  margin-top: 8px;
}
button:hover {
  background: #25745e;
}
.sentence {
  font-size: 25px;
  font-weight: bold;
  line-height: 1.5;
  color: #1d3557;
  margin: 20px 0;
  padding: 20px;
  border-left: 6px solid #2f8f74;
  background: #f3fbf8;
  border-radius: 10px;
}
.category-btn {
  display: block;
  width: 100%;
  text-align: left;
  margin: 10px 0;
  background: #eef3f7;
  color: #223;
}
.category-btn:hover {
  background: #dbe8ef;
}
.result {
  margin-top: 16px;
  padding: 14px;
  border-radius: 10px;
  line-height: 1.6;
  font-weight: bold;
}
.correct {
  background: #e6f7ee;
  color: #1f7a4d;
}
.wrong {
  background: #fff0f0;
  color: #b23b3b;
}
.tip {
  margin-top: 16px;
  color: #666;
  font-size: 14px;
  line-height: 1.7;
}
.small {
  color: #888;
  font-size: 13px;
  margin-top: 8px;
}
.footer {
  text-align: center;
  margin-top: 24px;
  color: #888;
  font-size: 13px;
}