:root {
  --primary: #386097;
  --primary-light: #4C79AF;
  --primary-dark: #2a4570;
  --success: #10b981;
  --danger: #dc3545;
  --warning: #f59e0b;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
  --radius: 12px;
  --transition: all 0.25s ease;
}

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

html, body {
  width: 100%;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.5;
  color: var(--gray-800);
  overflow-x: hidden;
}

/* LOGIN SCREEN */
.login-screen {
  background: linear-gradient(135deg, rgba(56, 96, 151, 0.85) 0%, rgba(76, 121, 175, 0.85) 100%),
              url('https://i.pinimg.com/736x/15/69/c0/1569c0d79ff6662c1b7b3af341048ae9.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

@media (max-width: 768px) {
  .login-screen {
    background-attachment: scroll;
    padding: 12px;
  }
}

.login-container {
  background: white;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  padding: 40px;
  max-width: 420px;
  width: 100%;
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-logo {
  width: 160px;
  height: 160px;
  margin: 0 auto 20px;
  display: block;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.login-header h1 {
  color: var(--primary);
  font-size: 22px;
  text-align: center;
  margin-bottom: 6px;
  font-weight: 700;
  line-height: 1.3;
}

.login-header .subtitle {
  color: var(--primary-light);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  color: var(--gray-800);
  font-weight: 600;
  font-size: 14px;
}

input {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  font-size: 15px;
  transition: var(--transition);
  font-family: inherit;
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(56, 96, 151, 0.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 8px rgba(56, 96, 151, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(56, 96, 151, 0.35);
}

.btn-full {
  width: 100%;
}

.login-footer {
  text-align: center;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--gray-200);
  color: var(--gray-600);
  font-size: 13px;
}

/* Alertas */
.alert {
  padding: 14px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 13px;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert-error {
  background: #fee2e2;
  color: #991b1b;
  border-left: 4px solid var(--danger);
}

.alert-success {
  background: #d1fae5;
  color: #065f46;
  border-left: 4px solid var(--success);
}

.alert-icon {
  font-size: 18px;
  flex-shrink: 0;
  margin-top: 2px;
}