/* 登录页专用样式（自包含，不依赖后台源码） */
:root {
  --bg: #f5f7fc;
  --card: #ffffff;
  --text: #1b2233;
  --text-2: #5c6579;
  --text-3: #929aab;
  --border: #e7eaf2;
  --border-strong: #d9deea;
  --primary: #5367ee;
  --primary-2: #8a5cf0;
  --primary-soft: #eef0ff;
  --shadow-hover: 0 14px 34px rgba(50, 63, 130, .14);
}
[data-theme="dark"] {
  --bg: #0e1118;
  --card: #1a1f2b;
  --text: #ecf0f8;
  --text-2: #a8b1c4;
  --text-3: #788298;
  --border: #2a3141;
  --border-strong: #39425a;
  --primary: #7e8dff;
  --primary-2: #ab7bff;
  --primary-soft: #232a49;
  --shadow-hover: 0 14px 34px rgba(0, 0, 0, .42);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 20px;
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.card {
  width: 100%; max-width: 370px; padding: 34px 32px 26px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 20px; box-shadow: var(--shadow-hover); text-align: center;
}
.logo {
  width: 54px; height: 54px; margin: 0 auto 16px; border-radius: 16px;
  display: grid; place-items: center; color: #fff; font-size: 25px; font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 8px 20px rgba(83, 103, 238, .3);
}
h1 { margin: 0 0 6px; font-size: 21px; }
.card > p { margin: 0 0 26px; color: var(--text-3); font-size: 12px; }
.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 15px; text-align: left; }
.field > span { font-size: 12px; font-weight: 600; color: var(--text-2); }
.field input {
  width: 100%; padding: 9px 11px;
  border: 1px solid var(--border); border-radius: 9px;
  background: var(--card); color: var(--text); outline: none; font-size: 13px;
}
.field input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.error {
  padding: 9px; margin-bottom: 12px; border-radius: 8px; font-size: 12px;
  background: #ffeded; color: #d13c3c;
}
.btn {
  width: 100%; height: 42px; margin-top: 6px; border: 0; border-radius: 9px;
  color: #fff; font-size: 14px; font-weight: 600; cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 4px 12px rgba(83, 103, 238, .22);
}
.btn:hover { filter: brightness(1.07); }
.btn:disabled { opacity: .65; cursor: wait; }
.back { display: inline-block; margin-top: 18px; font-size: 12.5px; color: var(--text-3); text-decoration: none; }
.back:hover { color: var(--primary); }