:root 
{

  --color-bg: #f5f5f7;     
  --color-text: #3D4852;      
  --color-accent: #4A90E2;      
  --color-card: #ffffff;      
}

[data-theme="dark"] 
{
  --color-bg: #1A202C;     
  --color-text: #E2E8F0;     
  --color-accent: #4A90E2;      
  --color-card: #2D3748;      
}

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

body 
{
  font-family: "Poppins", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* HEADER */
header 
{
  background: var(--color-card);
  padding: 15px 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.Encabezado h1 
{
  font-size: 1.6rem;
  color: var(--color-accent);
}

.nav-container nav 
{
  display: flex;
  gap: 20px;
}

.nav-container a 
{
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  position: relative;
}

.nav-container a::after 
{
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background: var(--color-accent);
  transition: width 0.3s;
}

.nav-container a:hover::after
{
  width: 100%;
}

header button 
{
  background: var(--color-accent);
  border: none;
  padding: 8px;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  transition: transform 0.2s;
}

header button:hover 
{
  transform: scale(1.1);
}

/*PROYECTOS*/
.proyectos {
    padding: 60px 5%;
    background: var(--color-bg);
}

.proyectos h2 
{
    text-align: center;
    margin-bottom: 50px;
    font-size: 2.5rem;
    color: var(--color-text);
}

.proyectos-container 
{
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.card 
{
    background: var(--color-card);
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 20px;
    padding: 20px;
}

.card:hover 
{
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.card:nth-child(even) 
{
    flex-direction: row-reverse;
}

.card img 
{

    max-width: 40%;
    border-radius: 10px;
    object-fit: cover;
    
}
.card-content 
{
    display: flex;
    flex-direction: column;
    padding: 0 10px;
}

.card-content h3 
{
    margin: 0 0 10px 0;
    color: var(--color-text);
}

.card-content p 
{
    margin: 0 0 20px 0;
    font-size: 0.95rem;
    flex-grow: 1;
    color: var(--color-text);
}


.tecnologias 
{
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tecnologias li 
{
    background-color: var(--color-accent);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
}

.card-links 
{
    display: flex;
    gap: 15px;
    margin-top: auto;
}

.btn-principal 
{
    background: var(--color-accent);
    color: white;
    padding: 10px 14px;
    border-radius: 15px;
    text-decoration: none;
    font-weight: 300;
    transition: background 0.3s, transform 0.2s;
}

.btn-principal:hover 
{
    transform: translateY(-2px);
}

/* CONTACTO */
.contacto 
{
  padding: 60px 5%;
  background-color: var(--color-bg);
  text-align: center;
}

.contacto h2 
{
  font-size: 2.5rem;
  margin-bottom: 15px;
  color: var(--color-text);
}

.contacto p 
{
  max-width: 600px;
  margin: 0 auto 40px auto;
  color: var(--color-text);
}

.form-contacto 
{
  max-width: 600px;
  margin: 0 auto;
  background: var(--color-card);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-grupo 
{
  display: flex;
  flex-direction: column;
  text-align: left;
}

.form-grupo label 
{
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text);
}

.form-grupo input, .form-grupo textarea 
{
  padding: 12px;
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border 0.3s, background 0.3s;
}


.btn-principal 
{
  border: none;
  cursor: pointer;
}

.telefono-container 
{
  display: flex;
  gap: 10px;
  align-items: center;
}
.telefono-container select 
{
  padding: 12px;
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border 0.3s, background 0.3s;
}

.telefono-container input 
{
  width: 100%;
  padding: 12px;
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 8px;
  font-size: 1rem;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: border 0.3s, background 0.3s;
}

/* FOOTER */
footer {
  background: var(--color-card);
  text-align: center;
  font-size: 0.85rem;
  border-top: 1px solid rgba(0,0,0,0.05);
}

.footer-container 
{
  background: var(--color-card);
  width: 100%;
  display: flex;
  flex-wrap: wrap;
}

.footer-section 
{
  flex: 1;
  margin: 10px;
}
.footer-section li 
{
  list-style: none;
  margin: 5px 0;
}
.footer-section h4 
{
  margin-bottom: 10px;

}
.footer-section a 
{
  display: block;
  color: var(--color-text);
  text-decoration: none;
  margin: 5px 0;
}

.footer-section a:hover 
{
  color: var(--color-accent);
}

.footer-bottom 
{
  text-align: center;
  padding: 10px 0;
  font-size: 0.8rem;
  color: #666;
}

#btnVolverArriba 
{
  display: none;
  position: fixed; 
  bottom: 20px; 
  right: 30px; 
  outline: none; 
  background-color: #1f6fa3; 
  color: white; 
  cursor: pointer;
  padding: 15px; 
  border-radius: 50px; 
  font-size: 18px; 
  transition: opacity 0.3s; 
  opacity: 0; 
}

#btnVolverArriba.visible
{
  display: block; 
  opacity: 1; 
}

#btnVolverArriba:hover 
{
  background-color: #333;
}

/* DISEÑO RESPONSIVO */
@media (max-width: 1024px) {
  .card img {
    max-width: 50%;
  }
  .proyectos {
    padding: 40px 5%;
  }
}
@media (max-width: 992px) {
  header {
    flex-direction: column;
    align-items: center;
  }

  .nav-container nav {
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }

  .card {
    flex-direction: column;
    text-align: center;
    padding: 15px;
  }

  .card img {
    max-width: 100%;
  }

  .card-content {
    padding: 10px 0;
  }
}


@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }

  .nav-container nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }

  .card {
    flex-direction: column;
    text-align: center;
    padding: 15px;
  }
    .card:nth-child(even) {
    flex-direction: column;
  }
  .card img {
    max-width: 100%;
  }

  .card-content {
    padding: 10px 0;
  }

  .form-contacto {
    width: 100%;
    padding: 20px;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .proyectos {
    padding: 30px 5%;
  }

  .proyectos h2 {
    font-size: 1.8rem;
  }

  .Encabezado h1 {
    font-size: 1.2rem;
  }

  .btn-principal {
    padding: 7px 10px;
    font-size: 0.85rem;
  }

  .tecnologias li {
    font-size: 0.7rem;
    padding: 3px 6px;
  }

  .form-contacto {
    padding: 15px;
    border-radius: 10px;
  }

  .form-grupo input,
  .form-grupo textarea,
  .telefono-container input {
    font-size: 0.9rem;
    width: 100%;
  }
}