:root {
  --primary: #01b5e2;
  --primary-dark: #0191b8;
  --primary-light: rgba(1, 181, 226, 0.1);
  --overlay-start: rgba(0, 0, 0, 0.25);
  --overlay-end: rgba(0, 0, 45, 0.85);
  --card-shadow: 0 15px 50px rgba(0, 0, 0, 0.10);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
  display: flex;
  min-height: 100vh;
}

.login-brand {
  flex: 0 0 45%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url('/images/background1.png') center/cover no-repeat;
  overflow: hidden;
}

.brand-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--overlay-start) 0%, var(--overlay-end) 100%);
}

.brand-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #fff;
  padding: 2rem;
  animation: fadeInUp 0.8s ease;
}

.brand-logo {
  width: 120px;
  height: auto;
  margin-bottom: 1.5rem;
  filter: brightness(0) invert(1);
}

.brand-content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.5px;
}

.brand-content p {
  font-size: 1rem;
  opacity: 0.85;
  font-weight: 300;
}

.login-form-panel {
  flex: 0 0 55%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8f9fc;
  padding: 2rem;
}

.form-card {
  width: 100%;
  max-width: 420px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 2.5rem;
  animation: fadeInUp 0.6s ease;
  position: relative;
}

.form-header {
  text-align: center;
  margin-bottom: 2rem;
}

.form-header .form-logo {
  width: 80px;
  height: auto;
  margin-bottom: 1rem;
}

.form-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 0.25rem;
}

.form-header p {
  font-size: 0.875rem;
  color: #6c757d;
  margin: 0;
}

.form-card .alert {
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  animation: slideIn 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-card .alert i {
  font-size: 1rem;
}

.form-card .form-group {
  margin-bottom: 1.25rem;
}

.form-card label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #495057;
  margin-bottom: 0.375rem;
}

.form-card .input-group {
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.form-card .input-group:focus-within {
  box-shadow: 0 0 0 3px var(--primary-light);
}

.form-card .input-group-text {
  background: #f8f9fc;
  border: 1px solid #e0e4ec;
  color: #6c757d;
  border-right: none;
  padding: 0.5rem 0.875rem;
}

.form-card .input-group .form-control {
  border: 1px solid #e0e4ec;
  border-left: none;
  padding: 0.625rem 0.875rem;
  font-size: 0.9375rem;
  height: auto;
  transition: border-color var(--transition);
}

.form-card .input-group .form-control:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: none;
}

.form-card .input-group .form-control.is-invalid {
  border-color: #dc3545;
}

.form-card .input-group .form-control.is-invalid ~ .input-group-append .btn {
  border-color: #dc3545;
}

.form-card .input-group:focus-within .input-group-text {
  border-color: var(--primary);
}

.form-card .toggle-password {
  border: 1px solid #e0e4ec;
  border-left: none;
  background: #f8f9fc;
  color: #6c757d;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: color var(--transition);
}

.form-card .toggle-password:hover {
  color: var(--primary);
}

.form-card .invalid-feedback {
  font-size: 0.75rem;
  margin-top: 0.25rem;
  display: none;
}

.form-card .form-check {
  display: flex;
  align-items: center;
}

.form-card .form-check-input {
  margin-top: 0;
}

.form-card .form-check-label {
  font-size: 0.8125rem;
  font-weight: 400;
  color: #6c757d;
  margin-bottom: 0;
}

.forgot-link {
  font-size: 0.8125rem;
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}

.forgot-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.btn-login {
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  transition: background var(--transition), transform 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
}

.btn-login:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-login:active {
  transform: translateY(0);
}

.btn-login:disabled {
  opacity: 0.8;
  cursor: not-allowed;
  transform: none;
}

.btn-loader {
  display: none;
  align-items: center;
  gap: 0.5rem;
}

.btn-login.loading .btn-text {
  display: none;
}

.btn-login.loading .btn-loader {
  display: inline-flex;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.mt-2 { margin-top: 0.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.text-center { text-align: center; }
.d-flex { display: flex; }
.justify-content-between { justify-content: space-between; }
.align-items-center { align-items: center; }
.w-100 { width: 100%; }

@media (max-width: 768px) {
  .login-container {
    flex-direction: column;
  }

  .login-brand {
    flex: 0 0 auto;
    min-height: 220px;
  }

  .brand-logo {
    width: 80px;
  }

  .brand-content h1 {
    font-size: 1.5rem;
  }

  .brand-content p {
    font-size: 0.875rem;
  }

  .login-form-panel {
    flex: 1;
    padding: 1.5rem;
    align-items: flex-start;
    padding-top: 2rem;
  }

  .form-card {
    box-shadow: none;
    padding: 1.5rem;
    border-radius: 0;
  }
}

@media (max-width: 480px) {
  .login-brand {
    min-height: 160px;
  }

  .brand-logo {
    width: 60px;
    margin-bottom: 0.75rem;
  }

  .brand-content h1 {
    font-size: 1.25rem;
  }

  .brand-content {
    padding: 1rem;
  }

  .form-card {
    padding: 1rem;
  }

  .form-header {
    margin-bottom: 1.5rem;
  }
}