/* Mostrar placeholder visible y con contraste */
.login-box ::placeholder {
  color: #b0b8c9;
  opacity: 1;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.5px;
}
body {
  min-height: 100vh;
  background: #232526 url('https://images.unsplash.com/photo-1506744038136-46273834b3fb?auto=format&fit=crop&w=1200&q=80') center center/cover no-repeat fixed;
  color: #e6e8ea;
  font-family: 'Segoe UI', 'Arial', sans-serif;
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  position: relative;
}
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(30,34,44,0.72);
  backdrop-filter: blur(7px);
  z-index: 0;
  pointer-events: none;
}
html, body {
  height: 100%;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.login-center {
  width: 100vw;
  max-width: 100vw;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.login-box {
  background: rgba(35,37,38,0.98);
  border-radius: 16px;
  box-shadow: 0 4px 24px #0005;
  padding: 24px 18px 18px 18px;
  min-width: 260px;
  max-width: 350px;
  width: 100%;
  text-align: center;
}
.login-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 1px;
}
.form-control {
  background: #232526;
  color: #fff;
  border: 1.5px solid #3a7bd5;
  border-radius: 0 8px 8px 0;
  margin-bottom: 14px;
  font-size: 1rem;
  padding-left: 12px;
  padding-top: 10px;
  padding-bottom: 10px;
  height: 44px;
  transition: border 0.2s, box-shadow 0.2s;
  min-width: 0;
  box-sizing: border-box;
}
.form-control:focus {
  border: 1.5px solid #fff;
  box-shadow: 0 2px 8px #3a7bd555;
}
.input-group-text {
  background: #232526;
  color: #3a7bd5;
  border: 1.5px solid #3a7bd5;
  border-right: none;
  border-radius: 8px 0 0 8px;
  min-width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.input-group-text i {
  font-size: 1.3rem;
  line-height: 1;
}
.btn-login {
  width: 100%;
  padding: 10px 0;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  background: linear-gradient(90deg, #3a7bd5 0%, #232526 100%);
  color: #fff;
  border: none;
  box-shadow: 0 2px 12px #0003;
  transition: background 0.4s, color 0.3s, transform 0.25s;
}
.btn-login:hover {
  background: linear-gradient(90deg, #232526 0%, #3a7bd5 100%);
  color: #fff;
  transform: scale(1.04);
}