:root {
  /* Light Theme */
  --bg-color: #f0f4f8;
  --surface-color: rgba(255, 255, 255, 0.7);
  --text-main: #0f172a;
  --text-muted: #475569;
  --accent: #2563eb;
  --accent-glow: rgba(37, 99, 235, 0.2);
  --border-color: rgba(226, 232, 240, 0.8);
  --header-bg: rgba(240, 244, 248, 0.8);
  --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
  --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Dark Theme - Deep Space */
  --bg-color: #030712;
  --surface-color: rgba(17, 24, 39, 0.7);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.2);
  --border-color: rgba(51, 65, 85, 0.5);
  --header-bg: rgba(3, 7, 18, 0.8);
  --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  transition: var(--transition);
  overflow-x: hidden;
  /* Animación de fondo sutil */
  background-image: 
    radial-gradient(at 0% 0%, var(--accent-glow) 0, transparent 50%), 
    radial-gradient(at 100% 100%, var(--accent-glow) 0, transparent 50%);
  background-attachment: fixed;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Header --- */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: -1px;
}

.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.toggles {
  display: flex;
  gap: 0.5rem;
}

#theme-toggle, #lang-toggle {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  transition: var(--transition);
}

#theme-toggle:hover, #lang-toggle:hover {
  transform: rotate(15deg);
  border-color: var(--accent);
}

/* Language Switcher Logic */
html[lang="en"] [lang="es"] { display: none !important; }
html[lang="es"] [lang="en"] { display: none !important; }

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}

.hero-content {
  max-width: 800px;
}

.hero .eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 700;
  font-size: 0.75rem;
  margin-bottom: 1.5rem;
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--accent-glow);
  border-radius: 100px;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  line-height: 1.05;
  margin-bottom: 2rem;
  font-weight: 800;
  letter-spacing: -2px;
}

.hero p {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  color: var(--text-muted);
  margin-bottom: 3rem;
  max-width: 600px;
}

.cta-group {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.btn {
  padding: 1rem 2.5rem;
  border-radius: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 20px -5px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 30px -5px var(--accent-glow);
}

.btn-outline {
  border: 1px solid var(--border-color);
  color: var(--text-main);
  background: var(--surface-color);
}

.btn-outline:hover {
  background: var(--border-color);
  transform: translateY(-3px);
}

/* --- Sections --- */
section { padding: 120px 0; }

.section-title {
  margin-bottom: 5rem;
}

.section-title h2 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}

.section-title .dash {
  width: 60px;
  height: 4px;
  background: var(--accent);
  border-radius: 2px;
}

/* --- Skills Bento --- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

.skill-card {
  background: var(--surface-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 2.5rem;
  border-radius: 24px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  grid-column: span 4;
}

.skill-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent);
  box-shadow: var(--card-shadow);
}

.skill-card i {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
  display: block;
}

.skill-card h3 { margin-bottom: 1rem; font-size: 1.5rem; }

/* --- Projects --- */
.project-card {
  background: var(--surface-color);
  border-radius: 32px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  transition: var(--transition);
}

.project-card:hover {
  box-shadow: var(--card-shadow);
  border-color: var(--accent);
}

.project-img {
  overflow: hidden;
  background: #000;
}

.project-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease;
}

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

.project-info { padding: 4rem; }

/* --- Timeline --- */
.timeline-item {
  position: relative;
  padding-left: 3rem;
  padding-bottom: 4rem;
  border-left: 2px solid var(--border-color);
}

.timeline-item:last-child { border-left-color: transparent; }

.timeline-dot {
  position: absolute;
  left: -11px;
  top: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-color);
  border: 4px solid var(--accent);
}

.timeline-date {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  display: block;
}

/* --- Footer --- */
footer {
  padding: 6rem 0 3rem;
  text-align: center;
  border-top: 1px solid var(--border-color);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3rem;
}

.social-links a {
  font-size: 1.5rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.social-links a:hover {
  color: var(--accent);
  transform: translateY(-5px);
}

/* --- Mobile / Responsive --- */
@media (max-width: 1024px) {
  .skill-card { grid-column: span 6; }
  .project-card { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .skill-card { grid-column: span 12; }
  .hero { text-align: center; }
  .hero-content { margin: 0 auto; }
  .cta-group { justify-content: center; }
  .project-info { padding: 2.5rem; }
  section { padding: 80px 0; }
}