* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft Yahei", sans-serif;
}
body {
  background: #f5f7fa;
  padding: 20px;
}
.hero {
  text-align: center;
  padding: 60px 20px 30px;
}
.hero h1 {
  font-size: 42px;
  margin-bottom: 12px;
  color: #222;
}
.hero p {
  color: #666;
  margin-bottom: 30px;
}
.nav {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}
.container {
  max-width: 520px;
  margin: 0 auto 40px;
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}
h2 {
  text-align: center;
  margin-bottom: 25px;
  color: #222;
}
input, textarea {
  width: 100%;
  padding: 12px 15px;
  margin: 8px 0;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 16px;
  outline: none;
}
textarea {
  min-height: 120px;
  resize: vertical;
}
.btn {
  width: 100%;
  padding: 12px;
  background: #0066ff;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  cursor: pointer;
  margin-top: 10px;
  transition: background 0.2s;
}
.btn:hover {
  background: #0052cc;
}
.github-btn {
  background: #24292f;
  margin-bottom: 15px;
}
.code-row {
  display: flex;
  gap: 10px;
}
.code-row input { flex: 1; }
.code-btn {
  width: 130px;
  background: #28a745;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  flex-shrink: 0;
}
.tip {
  text-align: center;
  margin-top: 15px;
  color: #666;
}
.tip a {
  color: #0066ff;
  text-decoration: none;
}
.line-text {
  text-align: center;
  color: #999;
  margin: 15px 0;
}
.cap-select {
  margin: 12px 0;
  display: flex;
  gap: 15px;
}
.cap-box {
  margin: 10px 0;
}
.hidden { display: none; }
.user-info {
  text-align: center;
  font-size: 16px;
  color: #333;
  margin-bottom: 15px;
}
.login-tip {
  text-align: center;
  color: red;
  margin: 15px 0;
}
.msg-list > div {
  background: #f8f8f8;
  padding: 15px;
  border-radius: 8px;
  margin: 10px 0;
}
.links {
  margin-top: 30px;
}
.links h3 {
  margin-bottom: 10px;
}
.links a {
  color: #0066ff;
  text-decoration: none;
  margin-right: 15px;
}