* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Microsoft YaHei", sans-serif; background: #f0f2f5; }

/* Login */
.login-wrapper {
  display: flex; justify-content: center; align-items: center;
  height: 100vh; background: #e8f4fd;
}
.login-box {
  background: #fff; padding: 40px; border-radius: 8px;
  width: 380px; box-shadow: 0 8px 32px rgba(0,0,0,.15);
}
.login-box h2 { text-align: center; margin-bottom: 30px; color: #333; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; color: #555; font-size: 14px; }
.form-input {
  width: 100%; padding: 10px 12px; border: 1px solid #dcdfe6;
  border-radius: 4px; font-size: 14px; outline: none; transition: border .2s;
}
.form-input:focus { border-color: #409eff; }
.checkbox-label { font-size: 14px; color: #666; cursor: pointer; display: flex; align-items: center; gap: 4px; }
.btn-login {
  width: 100%; padding: 12px; background: #409eff; color: #fff;
  border: none; border-radius: 4px; font-size: 16px; cursor: pointer;
  transition: background .2s;
}
.btn-login:hover { background: #337ecc; }
.btn-login:disabled { background: #a0cfff; cursor: not-allowed; }
.error-msg { color: #f56c6c; font-size: 13px; margin-top: 12px; text-align: center; min-height: 20px; }

/* Dashboard */
.header {
  background: #304156; color: #fff; padding: 0 20px;
  height: 50px; display: flex; align-items: center; justify-content: space-between;
}
.header h1 { font-size: 18px; }
.header-right { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.btn-logout { color: #fff; text-decoration: none; font-size: 13px; opacity: .8; }
.btn-logout:hover { opacity: 1; }
.main { display: flex; height: calc(100vh - 50px); }
.sidebar {
  width: 200px; background: #fff; border-right: 1px solid #e6e6e6;
}
.sidebar ul { list-style: none; }
.sidebar li a {
  display: block; padding: 14px 20px; color: #333;
  text-decoration: none; font-size: 14px; border-left: 3px solid transparent;
}
.sidebar li a:hover, .sidebar li a.active { background: #f0f7ff; color: #409eff; border-left-color: #409eff; }
.content { flex: 1; padding: 24px; }
.welcome { background: #fff; padding: 30px; border-radius: 6px; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.welcome h2 { margin-bottom: 10px; color: #333; }
.welcome p { color: #666; }