/* ===== CSS VARIABLES ===== */
:root {
  /* Dark theme defaults (used by default) */
  --bg1: #071022;
  --bg2: #081028;
  --card: #0b1220;
  --muted: #9aa4b2;
  --accent: #7c5cff;
  --accent-2: #00bfa6;
  --text: #e6eef6;
  --glass: rgba(255,255,255,0.03);
  --max-width: 1100px;
  --radius: 12px;
  --gap: 1.25rem;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* ===== BASE STYLES ===== */
* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: linear-gradient(180deg, var(--bg1) 0%, var(--bg2) 100%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  transition: background .25s ease, color .25s ease;
}

.container {
  width: calc(100% - 2rem);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 0;
}

/* ===== LIGHT MODE THEME ===== */
body.light-mode {
  --bg1: #f6f7fb;
  --bg2: #eef2f7;
  --card: #ffffff;
  --muted: #6b7280;
  --accent: #6b21a8;
  --accent-2: #0b815a;
  --text: #0b1220;
  --glass: rgba(0,0,0,0.04);
  background: linear-gradient(180deg, var(--bg1) 0%, var(--bg2) 100%);
  color: var(--text);
}

/* ===== HEADER STYLES ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9999;
  backdrop-filter: blur(6px);
  background: linear-gradient(180deg, rgba(2,6,23,0.45), rgba(2,6,23,0.25));
  border-bottom: 1px solid rgba(255,255,255,0.03);
}

body.light-mode .site-header {
  background: rgba(255,255,255,0.9);
  border-bottom-color: rgba(0,0,0,0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0;
  position: relative;
}

/* Left Header */
.left-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  font-size: 1.1rem;
}

/* Center Navigation */
.main-nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 50%;
  transform: translate(-50%, -50%);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.9rem;
}

.nav-list li a {
  text-decoration: none;
  font-weight: 600;
  color: var(--text);
  transition: color 0.3s ease;
}

.nav-list li a:hover,
.nav-list li a:focus {
  color: var(--primary-color, #007bff);
  outline: none;
}

/* Right Header */
.right-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.social-inline a {
  color: var(--muted);
  margin: 0 0.4rem;
  font-size: 1.25rem;
  transition: color .15s;
}

.social-inline a:hover {
  color: var(--text);
}

body.light-mode .social-inline a {
  color: var(--muted);
}

body.light-mode .fa-github { 
  color: #333; 
} /* modo claro */

/* Language Select */
#lang-select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-color: var(--card);
  color: var(--text);
  border: 1.5px solid var(--accent);
  padding: 0.35rem 1.5rem 0.35rem 0.6rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3csvg fill='%237c5cff' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M7 10l5 5 5-5z'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  background-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

#lang-select:hover,
#lang-select:focus {
  border-color: var(--accent-2);
  box-shadow: 0 0 8px var(--accent-2);
  outline: none;
}

body.light-mode #lang-select {
  background-color: var(--card);
  color: var(--text);
  border-color: var(--accent);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1.4rem;
  color: var(--muted);
  transition: color 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.theme-toggle-btn:hover,
.theme-toggle-btn:focus {
  color: var(--accent);
  outline: none;
}

body.light-mode .theme-toggle-btn {
  color: var(--accent-2);
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  color: var(--text);
  font-size: 1.1rem;
}

/* ===== HERO SECTION ===== */
.hero {
  padding: 6rem 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: var(--gap);
  align-items: center;
}

.hero-left h1 {
  margin: 0 0 0.5rem 0;
  font-size: 2.1rem;
  line-height: 1.05;
}

.highlight {
  color: var(--accent);
  font-size: 3rem;
  display: block;
}

.lead {
  color: var(--muted);
  margin-top: 0.25rem;
}

.cta-row {
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

/* Hero Card with Photo */
.hero-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius: var(--radius);
  padding: 0.6rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(2,6,23,0.6);
}

.hero-card img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  max-width: 420px;
}

/* Social Icons Under Photo */
.social-under-photo {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-under-photo a {
  font-size: 1.6rem;
  color: var(--muted);
  padding: 0.45rem;
  border-radius: 8px;
  background: transparent;
  transition: all .15s;
}

.social-under-photo a:hover {
  color: var(--text);
  transform: translateY(-4px);
  background: var(--glass);
}

body.light-mode .social-under-photo a {
  color: var(--text);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  padding: 0.5rem 0.85rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
}

.btn.primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 8px 24px rgba(124,92,255,0.12);
}

.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.04);
}

/* ===== SECTIONS ===== */
.section {
  padding: 2rem 0;
}

.section h2 {
  margin: 0 0 0.75rem 0;
  font-size: 1.4rem;
}

.section p {
  color: var(--muted);
}

#skills-title {
  margin-top: 0rem;
}

#experience-title {
  margin-top: 20rem;
}

#experience {
  margin-bottom: 20rem;
}

#projects-title {
  margin-top: 12rem;
}

#contact-title {
  margin-top: 14rem;
}

/* ===== SKILLS SECTION ===== */

.skills-wrapper{
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 1.5rem;

}

.skill-card {
  position: relative;
  border-radius: 20px;
  background: var(--card-bg);
  padding: 1.8rem;
  z-index: 0;
  overflow: visible;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: 20px;
  padding: 2px; /* grosor del borde */
  background: linear-gradient(90deg, var(--accent), #8b5cf6, var(--accent));
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: destination-out;

  mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  mask-composite: exclude;
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-hover);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.1);
}

.skill-card:hover::before {
    opacity: 1;
}

.card-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text);
    letter-spacing: 0.5px;
}

/* Data Analysis - Card grande */
.data-analysis {
    grid-column: 1 / 2;
    grid-row: 1 / 2;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1.2rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem;
  background: var(--skill-bg);
  
  /* Borde suave con sombra interna sutil */
  border: 1px solid transparent;
  border-radius: 12px;
  
  /* Añadimos un borde degradado con máscara para suavizar */
  background-clip: padding-box; /* para que el fondo no tape el borde */
  box-shadow: 0 0 8px 1px rgba(59, 130, 246, 0.15);
  
  transition: all 0.3s ease;
  position: relative;
}

/* Hover con borde y sombra más marcados pero suaves */
.skill-item:hover {
  transform: translateY(-3px);
  background: rgba(59, 130, 246, 0.15);
  
  /* Hacer borde visible y suave */
  border-color: var(--accent);
  box-shadow: 0 0 12px 3px rgba(59, 130, 246, 0.3);
}

.skill-icon {
    font-size: 2.5rem;
    margin-bottom: 0.8rem;
    color: var(--accent);
    transition: all 0.3s ease;
}

.skill-item:hover .skill-icon {
    transform: scale(1.1);
    color: var(--accent-hover);
}

.skill-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.skill-level {
    display: flex;
    gap: 3px;
    justify-content: center;
}

.level-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
}

.level-dot.active {
    background: var(--accent);
    box-shadow: 0 0 6px var(--accent);
}

/* Iconos específicos */
.fa-html5 { color: #e34f26; }
.fa-css3-alt { color: #1572b6; }
.fa-js { color: #f7df1e; }
.fa-python { color: #306998; }
.fa-bootstrap { color: #7952b3; }
.fa-github { color: #979da1; } /* modo oscuro */
.fa-server { color: #6c757d; }
.fa-search { color: #0d6efd; }
.fa-shield-alt { color: #dc3545; }
.fa-chart-bar { color: #fd7e14; }
.fa-project-diagram { color: #20c997; }
.fa-tasks { color: #0d6efd; }
.fa-database { color: #00758f; }
.fa-file-invoice { color: #ffc107; }
.fa-code { color: #007acc; }
.fa-language { color: #6f42c1; }
.fa-users { color: #198754; }
.fa-lightbulb { color: #fd7e14; }

/* Responsive */
@media (max-width: 1024px) {
  .skills-container {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto auto auto;
    gap: 1.5rem;
  }

  .development,
  .networking,
  .frameworks,
  .tools,
  .languages,
  .other-skills {
    grid-column: auto; /* que cada uno ocupe solo 1 columna */
    grid-row: auto;
  }
}

@media (max-width: 768px) {
    .skills-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .skill-card {
        padding: 1.5rem;
    }
    
    .data-analysis,
    .web-development,
    .languages,
    .frameworks,
    .tools {
        grid-column: 1 / 2;
        grid-row: auto;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        gap: 1rem;
    }
}

/* Animaciones de entrada */
.skill-card {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

.skill-card:nth-child(1) { animation-delay: 0.1s; }
.skill-card:nth-child(2) { animation-delay: 0.2s; }
.skill-card:nth-child(3) { animation-delay: 0.3s; }
.skill-card:nth-child(4) { animation-delay: 0.4s; }
.skill-card:nth-child(5) { animation-delay: 0.5s; }

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

body.light-mode .skills-column {
  background: var(--card);
  border-color: rgba(0,0,0,0.06);
}





/* ===== TIMELINE SECTION ===== */
.timeline {
  margin-top: 2rem;
}

.timeline-item {
  position: relative;
  padding: 1rem 0 1rem 2.2rem;
  border-left: 3px solid rgba(255,255,255,0.04);
}

body.light-mode .timeline-item {
  border-left-color: rgba(0,0,0,0.08);
}

.timeline-item .timeline-marker {
  position: absolute;
  left: -10px;
  top: 18px;
  width: 18px;
  height: 18px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 50%;
  box-shadow: 0 6px 18px rgba(2,6,23,0.4);
}

.timeline-item .timeline-content {
  background: transparent;
  padding-left: 0;
}

.timeline-year {
  display: inline-block;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

  /* ===== PROJECTS SECTION ===== */
  .projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 2rem;
  }

  .project-card {
    background: var(--card);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform .18s ease, box-shadow .18s ease;
    border: 1px solid rgba(255,255,255,0.03);
  }

  body.light-mode .project-card {
    background: var(--card);
    border-color: rgba(0,0,0,0.06);
  }

  .project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 40px rgba(2,6,23,0.6);
  }

  .project-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
  }

  .project-body {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    padding: 0.9rem;
  }

  .project-tags {
    color: var(--muted);
    font-size: 0.9rem;
  }

  .project-cta {
    margin-top: auto;
    display: flex;
    gap: 0.5rem;
  }

/* ===== CONTACT SECTION ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--gap);
  align-items: start;
  margin-bottom: 10rem;
}

.contact-form label {
  display: block;
  margin-bottom: 0.75rem;
  color: var(--muted);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.05);
  background: rgba(255,255,255,0.02);
  color: var(--text);
  outline: none;
}

body.light-mode .contact-form input,
body.light-mode .contact-form textarea {
  background: #fff;
  border-color: rgba(0,0,0,0.06);
  color: var(--text);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(124,92,255,0.9);
  box-shadow: 0 6px 20px rgba(124,92,255,0.06);
}

.contact-info a {
  color: var(--accent);
  text-decoration: none;
}

/* ===== BACK TO TOP BUTTON ===== */
.back-to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: white;
  padding: 0.6rem;
  border-radius: 50%;
  font-size: 1.05rem;
  box-shadow: 0 12px 28px rgba(2,6,23,0.45);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
  text-decoration: none;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 1.5rem 0;
  border-top: 1px solid rgba(255,255,255,0.03);
  text-align: center;
  color: var(--muted);
}

body.light-mode .site-footer {
  border-top-color: rgba(0,0,0,0.06);
}

/* ===== MISCELLANEOUS ===== */
a:hover {
  opacity: 0.95;
}

small {
  color: var(--muted);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr 320px;
  }
  
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-wrapper {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav {
    position: static;
    transform: none;
    margin: 1rem 0;
  }
  
  .nav-list {
    flex-direction: column;
    gap: 1rem;
  }
}

@media (max-width: 700px) {
  .nav-toggle {
    display: inline-block;
  }
  
  .right-header .social-inline {
    display: none;
  }
  
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .hero-card {
    order: -1;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  #lang-select {
    display: none;
  }
}