: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);
}
/*PRESENTACIÓN*/
.presentacion {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 60px 5%;
  flex-wrap: wrap;
}

.presentacion-texto {
  flex: 1;
  min-width: 280px;
}

.presentacion-texto h1 {
  font-size: 2.5rem;
  margin: 10px 0;
}

.presentacion-texto .descripcion {
  max-width: 500px;
  margin-bottom: 20px;
}
.btn-principal,
.btn-secundario {
  padding: 10px 20px;
  border-radius: 30px;
  font-weight: bold;
  text-decoration: none;
  transition: background 0.3s, transform 0.2s;
}

.btn-principal {
  background: var(--color-accent);
  color: white;
}

.btn-secundario {
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn-principal:hover {
  background: #217dbb;
  transform: scale(1.05);
}

.btn-secundario:hover {
  background: var(--color-accent);
  color: white;
  transform: scale(1.05);
}

.presentacion-imagen img {
  width: 300px;
  height: 300px;
  object-fit: cover;
  border-radius: 50%;  
  background-color: white; 
  box-shadow: 0 0 0 8px rgba(71, 76, 79, 0.03); 
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.presentacion-imagen img:hover {
  transform: scale(1.05);
  box-shadow: 0 0 0 12px #217dbb; 
}

/* PROYECTOS */
.proyectos {
    padding: 80px 5%;
    background-color: var(--color-bg);
}

.proyectos h2 {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 60px;
}

.proyectos-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 60px 40px; 
}

.proyecto-item {
    display: flex;
    flex-direction: column;
    gap: 20px; 
}

.proyecto-item img {
    width: 100%;
    border-radius: 18px;
    aspect-ratio: 4/3;
    object-fit:scale-down;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.proyecto-item a:hover img {
    transform: scale(1.03); 
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.2);
}

.proyecto-info {
    padding: 0 10px; 
}

.proyecto-info h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 8px 0;
}

.proyecto-info p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    opacity: 0.8;
}

/*EXPERIENCIA*/
.experiencia {
  padding: 50px 5%;
}

.experiencia-tabs ul {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  list-style: none;
}

.tab-btn {
  background-color: var(--color-accent);
  border: none;
  padding: 10px 15px;
  border-radius: 20px;
  color: white;
  cursor: pointer;
  transition: background 0.3s;
}

.tab-btn:hover {
  background: #217dbb;
}

.tab-btn.active {
  background: #1f6fa3;
}

.experiencia-contenido {
  margin-top: 20px;
}

.content-panel {
  display: none;
}

.content-panel.active {
  display: block;
  background: var(--color-card);
  padding: 20px;
  border-radius: 10px;
}

/*HABILIDADES*/

.habilidades {
    padding: 50px 5%;
    background-color: var(--color-bg); 
}

.habilidades h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2.5rem;
    color: var(--color-text);
}

.habilidades-grupo {
    margin-bottom: 50px;
}

.habilidades-grupo h4 {
    font-size: 1.2rem;
    color: var(--color-accent);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: 5px;
    display: inline-block;
}

.habilidades-grupo ul {
    list-style: none; 
    padding: 0;
    margin: 0;
    display: flex; 
    flex-wrap: wrap; 
    gap: 20px;

}

.habilidades-grupo li {
    background-color: var(--color-card);
    color: var(--color-text);
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.9rem;
    border: 1px solid rgba(0,0,0,0.05);
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.habilidades-grupo li:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    color: var(--color-accent);
}

/*CONTACTO */
.contacto {
  padding: 30px 5%;
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
 
}
.btn-descarga {
    display: inline-block;
    margin: 25px 0;
    padding: 12px 25px;
    background-color: var(--color-accent);
    color: #fff;
    font-weight: 600;
    text-decoration: none; 
    border-radius: 5px;
    text-align: center;
    transition: background-color 0.3s, transform 0.2s;
    border: 2px solid transparent;
}

.btn-descarga:hover {
    background-color: #2980b9; 
    transform: translateY(-2px); 
}

.form-contacto {
  max-width: 350px;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.form-contacto ::placeholder {
  color: var(--color-text);
}
.form-contacto input,
.form-contacto textarea  {
  background-color: var(--color-card);
  color: var(--color-text) ;
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 0.9rem;
}

.btn-terciario {
  padding: 8px;
  border: none;
  background-color: var(--color-accent);
  color: white;
  font-size: 0.9rem;
  border-radius: 6px;
  cursor: pointer;
}

.btn-terciario:hover {
  background-color: #555;
}

/*BOTÓN VOLVER ARRIBA*/
#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;
}

/*FOOTER */
footer {
  background: var(--color-card);
  text-align: center;
  padding: 15px;
  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 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-section li {
  list-style: none;
  margin: 5px 0;
}

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

/* DISEÑO RESPONSIVO*/

@media (min-width: 1200px) {
  .presentacion-texto h1 {
    font-size: 3rem;
  }
}
@media (max-width: 1024px) {
  header {
    flex-wrap: wrap;
    padding: 15px 3%;
  }

  .nav-container nav {
    flex-wrap: wrap;
    gap: 15px;
  }

  .presentacion {
    flex-wrap: wrap;
    gap: 20px;
  }

  .presentacion-imagen img {
    width: 250px;
    height: 250px;
  }

  .habilidades-grupo ul {
    gap: 15px;
  }

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

@media (max-width: 768px) 
{
 
  .presentacion {
    flex-direction: column-reverse;
    text-align: center;
    padding: 40px 5%;
  }

  .presentacion-imagen img {
    max-width: 70%;
    height: auto;
  }

  .botones {
    justify-content: center;
    flex-wrap: wrap;
  }

  .habilidades-grupo ul {
    justify-content: center;
  }

  .footer-section {
    margin: 15px 0;
  }
}

@media (max-width: 480px) 
{
  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;
  }
}
  .presentacion-texto h1 
  {
    font-size: 1.8rem;
  }

  .presentacion-imagen img 
  {
    max-width: 90%;
  }

  .habilidades h2 
  {
    font-size: 2rem;
  }

  .habilidades-grupo h4 
  {
    font-size: 1rem;
  }

  .btn-principal,
  .btn-secundario,
  .btn-descarga {
    width: 100%;
    text-align: center;
  }