/* ====== CSS Variables (Themes) ====== */
:root {
  --bg-color: #0a0a0a;
  --text-color: #ededed;
  --text-muted: #a1a1aa;
  --accent-color: #6366f1; /* Sleek indigo */
  --accent-hover: #4f46e5;
  --nav-bg: rgba(10, 10, 10, 0.75);
  --card-bg: rgba(255, 255, 255, 0.03);
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.5);
  --transition-speed: 0.3s;
}

body.light-mode {
  --bg-color: #f8fafc;
  --text-color: #0f172a;
  --text-muted: #475569;
  --accent-color: #4f46e5;
  --accent-hover: #4338ca;
  --nav-bg: rgba(248, 250, 252, 0.85);
  --card-bg: #ffffff;
  --border-color: rgba(0, 0, 0, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.05);
}

/* ====== Global Styles ====== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Montserrat", sans-serif;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

h1, h2, h3, h4 {
  color: var(--text-color);
  font-weight: 700;
}

/* ====== Animations ====== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ====== Header & Navigation ====== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  padding: 0 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.header .logo img {
  height: 50px;
  width: 50px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-color);
  transition: transform var(--transition-speed) ease;
}

.header .logo img:hover {
  transform: scale(1.1) rotate(-5deg);
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-links li {
  display: inline-block;
}

.nav-links a {
  color: var(--text-color);
  font-weight: 500;
  position: relative;
  font-size: 0.95rem;
}

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

.nav-links a:hover {
  color: var(--accent-color);
}

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

/* Theme Toggle Button */
.theme-btn {
  background: none;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border-radius: 50%;
  transition: background var(--transition-speed) ease;
}

.theme-btn:hover {
  background: var(--card-bg);
  color: var(--accent-color);
}

/* ====== Principal (Hero Section) ====== */
.principal {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 120px 20px 60px;
}

#typewriter {
  color: var(--accent-color);
  font-size: clamp(1.8rem, 6vw, 3.5rem);
  border-right: 3px solid var(--accent-color);
  white-space: nowrap;
  overflow: hidden;
  display: inline-block;
  margin: 10px auto;
  animation: blinkCursor 0.8s steps(2) infinite;
  min-height: 1.2em;
}

@keyframes blinkCursor {
  0%, 50% { border-color: var(--accent-color); }
  51%, 100% { border-color: transparent; }
}

.principal h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: 10px;
}

.principal p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 30px;
}

.downloadCV {
  background-color: var(--accent-color);
  color: #fff;
  border-radius: 30px;
  padding: 12px 30px;
  font-weight: 600;
  transition: transform var(--transition-speed) ease, background-color var(--transition-speed) ease;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
  margin-bottom: 40px;
}

.downloadCV:hover {
  background-color: var(--accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
  color: #fff;
}

.redes-container {
  display: flex;
  gap: 15px;
  margin-bottom: 40px;
}

.btn_redes {
  background-color: var(--card-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 20px;
  font-weight: 500;
  transition: all var(--transition-speed) ease;
}

.btn_redes:hover {
  background-color: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
  transform: translateY(-3px);
}

#leng-p {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  max-width: 800px;
}

#leng-p img {
  height: 40px;
  width: 40px;
  opacity: 0.7;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

#leng-p img:hover {
  opacity: 1;
  transform: translateY(-3px) scale(1.1);
}

/* ====== About Me ====== */
.about-me {
  max-width: 1000px;
  margin: 0 auto;
  padding: 80px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.about-me h1 {
  font-size: 2.5rem;
  color: var(--accent-color);
  text-align: center;
  width: 100%;
}

.about-me-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.presentacion {
  text-align: left;
  font-size: 1.1rem;
  color: var(--text-muted);
}

.presentacion p {
  margin-bottom: 20px;
}

.colorfrase {
  color: var(--text-color);
  font-weight: 600;
}

.about-me img {
  width: 250px;
  height: 250px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent-color);
  box-shadow: 0 10px 30px var(--shadow-color);
  transition: transform 0.4s ease;
}

.about-me img:hover {
  transform: scale(1.05);
}

.tech-icons-small {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  margin-top: 20px;
}

.tech-icons-small img {
  width: 30px;
  height: 30px;
  opacity: 0.7;
  transition: all 0.3s ease;
}

.tech-icons-small img:hover {
  opacity: 1;
  transform: translateY(-3px);
}

/* ====== Projects Section ====== */
.projects-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px;
}

.main-title {
  font-size: 2.5rem;
  color: var(--accent-color);
  text-align: center;
  margin-bottom: 10px;
}

.subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.2rem;
  margin-bottom: 40px;
}

.category-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 50px;
}

.category-btn {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  font-size: 1rem;
  padding: 10px 25px;
  border-radius: 30px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.category-btn:hover, .category-btn.active {
  background-color: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
}

.content-area {
  display: none;
  animation: fadeIn 0.5s ease;
}

.content-area.active {
  display: block;
}

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

.category-title {
  font-size: 2rem;
  margin-bottom: 40px;
  border-bottom: 2px solid var(--accent-color);
  display: inline-block;
  padding-bottom: 10px;
}

.project-item {
  display: flex;
  flex-direction: column;
  gap: 30px;
  margin-bottom: 60px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 10px 30px var(--shadow-color);
  transition: transform 0.3s ease;
}

.project-item:hover {
  transform: translateY(-5px);
}

.project-info {
  flex: 1;
}

.project-name {
  font-size: 1.8rem;
  margin-bottom: 15px;
  color: var(--accent-color);
}

.project-description {
  color: var(--text-muted);
  margin-bottom: 25px;
}

.project-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  margin-bottom: 25px;
}

.btn {
  background-color: transparent;
  color: var(--text-color);
  border: 1px solid var(--accent-color);
  padding: 10px 25px;
  border-radius: 30px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn:hover {
  background-color: var(--accent-color);
  color: #fff;
}

.tech-stack {
  display: flex;
  gap: 15px;
}

.tech-icon {
  width: 25px;
  height: 25px;
  opacity: 0.8;
}

.project-preview {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  border-radius: 12px;
}

.project-preview img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-preview:hover img {
  transform: scale(1.05);
}

/* ====== Certificaciones ====== */
.certificaciones {
  padding: 80px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

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

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.cert-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px var(--shadow-color);
  transition: transform 0.3s ease;
}

.cert-card:hover {
  transform: translateY(-8px);
}

.cert-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.cert-title {
  position: absolute;
  top: 15px;
  left: 15px;
  background: var(--accent-color);
  color: #fff;
  padding: 5px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 10, 10, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(4px);
}

.cert-card:hover .overlay {
  opacity: 1;
}

.download-btn {
  background: var(--accent-color);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  transition: transform 0.3s ease, background 0.3s ease;
}

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

/* ====== Contacto ====== */
.contacto {
  text-align: center;
  padding: 80px 20px;
  background: var(--card-bg);
  border-top: 1px solid var(--border-color);
}

.contacto h1 {
  font-size: 2.5rem;
  color: var(--accent-color);
  margin-bottom: 20px;
}

.contacto p {
  color: var(--text-muted);
  margin-bottom: 40px;
}

.contactos {
  display: flex;
  justify-content: center;
  gap: 25px;
}

.contacto-item {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.contacto-item svg {
  width: 25px;
  height: 25px;
  transition: transform 0.3s ease;
  fill: currentColor;
}

.contacto-item:hover {
  background: var(--accent-color);
  border-color: var(--accent-color);
  transform: translateY(-5px);
  color: #fff;
}

.contacto-item:hover svg {
  transform: scale(1.1);
}

/* ====== Media Queries (Responsiveness) ====== */
@media (min-width: 768px) {
  .about-me-content {
    flex-direction: row;
    justify-content: space-between;
  }
  
  .presentacion {
    flex: 1;
  }
  
  .project-item {
    flex-direction: row;
    align-items: center;
  }
}

@media (max-width: 768px) {
  .header {
    height: auto;
    padding: 10px 5%;
    flex-direction: column;
    gap: 10px;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }
  
  .theme-btn {
    position: absolute;
    top: 15px;
    right: 5%;
  }
  
  .principal {
    padding-top: 100px;
  }
}