.header {
  padding: 1.25rem 5%;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: var(--z-header);
  background: rgba(10, 25, 47, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: var(--transition);
}

.header.scrolled {
  padding: 0.75rem 5%;
  box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-max);
  margin: 0 auto;
  gap: var(--space-md);
}

.logo {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  color: var(--color-secondary);
  font-weight: 700;
  letter-spacing: 2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
  counter-reset: nav-counter;
  font-family: var(--font-display);
}

.nav-menu .nav-link a {
  color: var(--color-light);
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 500;
  letter-spacing: 1.5px;
  transition: var(--transition);
  position: relative;
  padding: 0.4rem 0.2rem;
}

.nav-menu .nav-link a::before {
  content: counter(nav-counter, decimal-leading-zero) '. ';
  counter-increment: nav-counter;
  font-family: var(--font-display);
  color: var(--color-secondary);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 1px;
}

.nav-menu .nav-cta .cta-button {
  font-family: var(--font-display);
  letter-spacing: 1.5px;
}

.nav-menu .nav-link a:hover,
.nav-menu .nav-link a:focus-visible {
  color: var(--color-secondary);
}

.nav-cta {
  margin-left: var(--space-xs);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: calc(var(--z-header) + 1);
}

section {
  scroll-margin-top: var(--header-height);
}

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

.hero {
  min-height: 100vh;
  padding: 10rem 5% 5rem;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

@media (max-width: 900px) {
  .hero {
    min-height: auto;
    padding: calc(var(--header-height) + 2rem) 5% 4rem;
    align-items: flex-start;
    overflow: visible;
  }
}

.hero-content {
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  position: relative;
  z-index: var(--z-content);
}

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

#particles-js {
  position: absolute;
  inset: 0;
  z-index: var(--z-particles);
}

.education,
.about,
.skills,
.experience,
.projects,
.contact {
  padding: var(--section-padding);
}

.education-grid,
.about-grid,
.experience-grid {
  max-width: 900px;
  margin: 0 auto;
}

.skills {
  text-align: center;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-lg);
  max-width: var(--container-max);
  margin: var(--space-lg) auto 0;
}

.skills .section-title::after {
  margin-left: auto;
  margin-right: auto;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
  max-width: var(--container-max);
  margin: var(--space-xl) auto 0;
}

.footer {
  padding: var(--space-lg) 5%;
  text-align: center;
  border-top: 1px solid rgba(100, 255, 218, 0.08);
  color: var(--color-muted);
  font-size: var(--fs-sm);
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
  font-size: 1.25rem;
}

.footer-socials a {
  color: var(--color-light);
  transition: var(--transition);
}

.footer-socials a:hover {
  color: var(--color-secondary);
  transform: translateY(-3px);
}