/* 登录/注册页样式 */
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC", sans-serif;
  background: linear-gradient(135deg, var(--brand, #12b7f5) 0%, #1f78d1 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.auth-bg { width: 100%; min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.auth-card {
  width: 380px;
  background: #fff;
  border-radius: 16px;
  padding: 38px 34px 30px;
  box-shadow: 0 18px 50px rgba(0, 60, 120, .25);
}
.brand { text-align: center; margin-bottom: 22px; }
.logo {
  width: 60px; height: 60px; line-height: 60px; margin: 0 auto 12px;
  background: var(--brand, #12b7f5); color: #fff; border-radius: 14px;
  font-weight: 800; font-size: 26px; letter-spacing: 1px;
  box-shadow: 0 6px 18px rgba(18,183,245,.45);
}
.brand h1 { margin: 0 0 4px; font-size: 22px; color: #1a1a1a; }
.brand p { margin: 0; font-size: 12px; color: #9aa3ad; }
form { display: flex; flex-direction: column; gap: 14px; margin-top: 6px; }
form input {
  height: 46px; padding: 0 14px; font-size: 15px;
  border: 1px solid #e1e6eb; border-radius: 10px; outline: none;
  transition: border-color .2s, box-shadow .2s;
}
form input:focus { border-color: var(--brand, #12b7f5); box-shadow: 0 0 0 3px rgba(18,183,245,.15); }
form button {
  height: 46px; border: 0; border-radius: 10px; cursor: pointer;
  background: var(--brand, #12b7f5); color: #fff; font-size: 16px; font-weight: 600;
  letter-spacing: 4px; transition: filter .2s;
}
form button:hover { filter: brightness(0.92); }
.foot a { color: var(--brand, #12b7f5); }
.alert {
  background: #fdecec; color: #c0392b; border: 1px solid #f5c2c2;
  padding: 10px 14px; border-radius: 8px; font-size: 13px; margin-bottom: 14px;
}
.alert.ok { background: #eafaf1; color: #1e8e4e; border-color: #b8eccb; }
.foot { text-align: center; margin-top: 18px; font-size: 13px; color: #9aa3ad; }
.foot a { color: var(--brand, #12b7f5); text-decoration: none; }
.foot span { margin: 0 8px; }

/* 第三方登录 */
.oauth { text-align: center; margin-top: 18px; }
.oauth-tip { font-size: 12px; color: #b3b9c0; position: relative; margin-bottom: 12px; }
.oauth-tip::before, .oauth-tip::after {
  content: ''; position: absolute; top: 50%; width: 28%; height: 1px; background: #e6e9ed;
}
.oauth-tip::before { left: 0; } .oauth-tip::after { right: 0; }
.oauth-btns { display: flex; gap: 10px; justify-content: center; }
.oauth-btn {
  display: inline-block; padding: 9px 18px; border-radius: 22px; color: #fff;
  font-size: 13px; text-decoration: none; font-weight: 600;
}