/* Page structure: backdrop, header, sections, footer. Mobile first. */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.backdrop__grid {
  position: absolute;
  inset: -1px;
  background-image:
    linear-gradient(rgb(255 255 255 / 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgb(255 255 255 / 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 0%, transparent 75%);
}

.backdrop__glow {
  position: absolute;
  width: 60vmax;
  height: 60vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.22;
}

.backdrop__glow--cyan { top: -25vmax; left: -15vmax; background: var(--color-cyan); }
.backdrop__glow--violet { top: 30vh; right: -25vmax; background: var(--color-violet); opacity: 0.16; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgb(7 10 20 / 0.72);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  max-width: var(--container);
  height: var(--header-height);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover { color: var(--color-text); }

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--gradient-accent);
  color: #070a14;
  font-size: 0.85rem;
  font-weight: 700;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.nav { display: none; }

.nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  list-style: none;
}

.nav__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
}

.nav__link:hover,
.nav__link[aria-current='true'] {
  color: var(--color-text);
  background: var(--color-surface-strong);
}

/* Mobile menu: the nav becomes a dropdown panel. */
.nav.is-open {
  display: block;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  padding: var(--space-3) var(--gutter) var(--space-5);
  background: rgb(7 10 20 / 0.96);
  border-bottom: 1px solid var(--color-border);
}

.no-js .nav { display: none; }

@media (min-width: 960px) {
  .nav,
  .nav.is-open {
    display: block;
    position: static;
    padding: 0;
    background: none;
    border: 0;
    margin-left: auto;
  }

  .nav__list { flex-direction: row; }
  .site-header__actions { margin-left: 0; }
  .menu-toggle { display: none !important; }
}

/* Main & sections */
main {
  display: block;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

main:focus { outline: none; }

.section {
  padding: var(--space-8) 0 var(--space-6);
}

.section--hero {
  min-height: calc(100svh - var(--header-height));
  display: flex;
  align-items: center;
  padding-top: var(--space-6);
}

.section--certifications,
.section--languages {
  padding-top: var(--space-6);
}

.section__header {
  max-width: 760px;
  margin-bottom: var(--space-6);
}

.section__title {
  font-size: var(--text-2xl);
}

.section__title::before {
  content: '// ';
  font-family: var(--font-mono);
  font-size: 0.6em;
  vertical-align: middle;
  color: var(--color-cyan);
}

.section__subtitle {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}

/* Footer */
.site-footer {
  max-width: var(--container);
  margin: var(--space-7) auto 0;
  padding: var(--space-6) var(--gutter) var(--space-7);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
  text-align: center;
}

.site-footer p { margin: var(--space-1) 0; }

/* States */
.loader {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  padding: 30vh 0;
}

.loader span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-cyan);
  opacity: 0.6;
}

.load-error,
.noscript {
  max-width: 640px;
  margin: var(--space-7) auto;
  padding: var(--space-6);
  text-align: center;
}

.noscript__links,
.load-error ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
  list-style: none;
}

.no-js main { display: none; }