/* 通用样式 */
* {
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", sans-serif;
  background: #1e1e2f;
  color: #eee;
  margin: 0;
  padding: 20px;
}

h1, h2, h3 {
  color: #4fc3f7;
  text-align: center;
}

label, p {
  color: #ccc;
  margin: 10px 0 5px;
  display: block;
}

select, input, textarea {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  background: #2c2c3a;
  border: 1px solid #444;
  border-radius: 6px;
  color: #eee;
  font-size: 15px;
}

textarea {
  resize: vertical;
}

button {
  margin: 10px 0;
  padding: 10px 16px;
  background-color: #4fc3f7;
  border: none;
  border-radius: 6px;
  color: #111;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background-color: #29b6f6;
}

/* 布局容器 */
.container {
  max-width: 700px;
  margin: 0 auto;
  background: #2a2a3d;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
}

/* 链接导航 */
a {
  color: #4fc3f7;
  text-decoration: none;
  margin: 0 5px;
  font-weight: bold;
}

a:hover {
  color: #29b6f6;
  text-decoration: underline;
}

/* 分隔线 */
hr {
  margin: 30px 0;
  border: none;
  border-top: 1px solid #444;
}

/* 首页列表 */
ul {
  list-style-type: none;
  padding: 0;
}

ul li {
  background: #2a2a3d;
  margin: 10px 0;
  padding: 12px 20px;
  border-left: 4px solid #4fc3f7;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

ul li a {
  color: #4fc3f7;
  display: block;
}

@media (max-width: 480px) {
  body {
    padding: 15px;
  }

  .container {
    padding: 15px;
    border-radius: 10px;
  }

  h1, h2, h3 {
    font-size: 1.4em;
  }

  button {
    width: 100%;
    font-size: 15px;
  }

  select, input, textarea {
    font-size: 14px;
  }

  ul li {
    padding: 10px 15px;
    font-size: 14px;
  }
}

.page {
  display: none;
}

.page.active {
  display: block;
}