:root {
  --bg: #0b1020;
  --bg-alt: #0e1428;
  --surface: #131b33;
  --border: #1f2b4d;
  --text: #d6deef;
  --text-muted: #8b97b5;
  --heading: #f2f5fb;
  --accent: #4fd1c5;
  --accent-2: #7aa2ff;
  --accent-soft: rgba(79, 209, 197, 0.12);
  --max-width: 1080px;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Space Grotesk', var(--font-body);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { font-family: var(--font-heading); color: var(--heading); line-height: 1.2; }

a { color: var(--accent); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--accent-2); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

/* ---------- Language switching ---------- */
html[data-lang="en"] .es { display: none !important; }
html[data-lang="es"] .en { display: none !important; }

.lang-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.lang-toggle button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.32rem 0.7rem;
  transition: background .2s ease, color .2s ease;
}

.lang-toggle button:hover { color: var(--accent); }

.lang-toggle button.active {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11, 16, 32, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--heading);
  font-size: 1.05rem;
}

.nav-right { display: flex; align-items: center; gap: 1.75rem; }

.nav-links { display: flex; gap: 1.75rem; }

.nav-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--accent); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 7rem 0 4rem;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  max-width: 800px;
  max-height: 800px;
  background: radial-gradient(circle, rgba(122, 162, 255, 0.14) 0%, rgba(79, 209, 197, 0.08) 40%, transparent 70%);
  pointer-events: none;
}

.hero-kicker {
  color: var(--accent);
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: clamp(2.75rem, 8vw, 4.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: clamp(1.5rem, 4.5vw, 2.5rem);
  font-weight: 600;
  color: var(--text-muted);
  margin: 0.25rem 0 1.5rem;
}

.hero-tagline {
  max-width: 580px;
  color: var(--text-muted);
  font-size: 1.125rem;
}

.hero-location { margin-top: 1rem; color: var(--text-muted); font-size: 0.95rem; }

.hero-actions { display: flex; gap: 1rem; margin-top: 2.25rem; flex-wrap: wrap; }

.hero-social { display: flex; gap: 1.25rem; margin-top: 2.5rem; }
.hero-social a { color: var(--text-muted); display: inline-flex; }
.hero-social a:hover { color: var(--accent); transform: translateY(-2px); }
.hero-social a { transition: color .2s ease, transform .2s ease; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  border-radius: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b1020;
}
.btn-primary:hover {
  color: #0b1020;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79, 209, 197, 0.28);
}

.btn-ghost {
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-ghost:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.btn-lg { padding: 1rem 2.4rem; font-size: 1.05rem; }

/* ---------- Sections ---------- */
.section { padding: 6rem 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  font-weight: 700;
  margin-bottom: 2.75rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.section-title.centered { justify-content: center; }

.section-number {
  color: var(--accent);
  font-size: 0.75em;
  font-weight: 600;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 3.5rem;
  align-items: start;
}

.about-text p + p { margin-top: 1.25rem; }
.about-text { color: var(--text-muted); }

.about-skills h3 {
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  color: var(--heading);
}

.skills-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem 1rem;
}

.skills-list li {
  font-size: 0.92rem;
  color: var(--text-muted);
  padding-left: 1.2rem;
  position: relative;
}
.skills-list li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.about-langs {
  margin-top: 1.5rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.about-langs strong { color: var(--text); }

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(79, 209, 197, 0.45);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.project-icon { font-size: 2rem; }

.project-links { display: flex; gap: 0.9rem; }
.project-links a { color: var(--text-muted); display: inline-flex; }
.project-links a:hover { color: var(--accent); }

.project-title { font-size: 1.25rem; margin-bottom: 0.75rem; }

.project-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  flex-grow: 1;
}

.project-desc code {
  font-size: 0.84em;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.08em 0.35em;
  border-radius: 4px;
}

.project-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.project-tags li {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
}

.project-demo {
  margin-top: 1.25rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
}

.project-demo-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.5rem;
}

.project-demo-row .project-demo { margin-top: 1.25rem; }

.projects-more {
  margin-top: 2.5rem;
  text-align: center;
  color: var(--text-muted);
}

/* ---------- Timeline ---------- */
.timeline {
  list-style: none;
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.45rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 3rem;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.99rem;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.timeline-meta {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.timeline-role { font-size: 1.15rem; }
.timeline-company { color: var(--accent-2); }

.timeline-place {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0.2rem 0 0.75rem;
}

.timeline-item > p:not(.timeline-place) {
  color: var(--text-muted);
  font-size: 0.97rem;
  max-width: 720px;
}

.timeline-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.timeline-tags li {
  font-family: var(--font-heading);
  font-size: 0.74rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
}

.education {
  margin-top: 4rem;
  padding: 1.75rem 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.education h3 { margin-bottom: 0.9rem; font-size: 1.1rem; }
.education p { color: var(--text-muted); font-size: 0.95rem; }
.education p + p { margin-top: 0.4rem; }
.education strong { color: var(--text); }

/* ---------- Recommendations ---------- */
.recs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.rec-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

.rec-card blockquote p {
  color: var(--text);
  font-size: 0.98rem;
  font-style: italic;
}

.rec-card figcaption {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.rec-card figcaption strong {
  font-family: var(--font-heading);
  color: var(--heading);
}

.rec-card figcaption span {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---------- Contact ---------- */
.contact-container { text-align: center; }

.contact-text {
  max-width: 540px;
  margin: 0 auto 2.25rem;
  color: var(--text-muted);
}

.contact-links {
  margin-top: 2.25rem;
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ---------- Footer ---------- */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: var(--font-heading);
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .about-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .nav-right { gap: 1.1rem; }
  .nav-links { gap: 1.1rem; }
  .nav-links a { font-size: 0.85rem; }
  .section { padding: 4.5rem 0; }
}

@media (max-width: 540px) {
  .nav-links a:not(:last-child) { display: none; }
  .hero { padding-top: 6rem; }
  .timeline { padding-left: 1.6rem; }
  .timeline-item::before { left: -1.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}