/* ============================================================
   LAYOUT - Containers, grids, responsive breakpoints
   ============================================================ */

/* === BASE === */
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* === CONTAINER === */
.container {
  width: min(var(--max-width), 100% - var(--space-lg) * 2);
  margin-inline: auto;
}

/* === SECTION SPACING === */
.section {
  padding-block: var(--space-2xl);
}

/* === NAVIGATION LAYOUT === */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  width: min(var(--max-width), 100% - var(--space-lg) * 2);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

/* === HERO LAYOUT === */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-block: var(--space-3xl);
}

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

/* === ABOUT LAYOUT === */
.about__grid {
  max-width: 800px;
  margin-inline: auto;
}

/* === SKILLS GRID === */
.skills__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

/* === PROJECTS GRID === */
.projects__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

/* === CERTS GRID === */
.certs__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

/* === TESTIMONIALS GRID === */
.testimonials__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

/* === BLOG GRID === */
.blog__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
  margin-top: var(--space-lg);
}

/* === METRICS GRID === */
.metrics__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

/* === TIMELINE LAYOUT === */
.timeline {
  position: relative;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

/* === CONTACT LAYOUT === */
.contact__wrapper {
  max-width: 640px;
  margin-inline: auto;
  text-align: center;
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

/* === FOOTER LAYOUT === */
.footer__container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding-block: var(--space-lg);
  text-align: center;
}

/* ============================================================
   MOBILE NAV (< 640px)
   ============================================================ */
.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  z-index: 110;
}

.nav__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-heading);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Mobile nav overlay */
.nav__list {
  display: flex;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(300px, 80vw);
  flex-direction: column;
  justify-content: center;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background-color: var(--color-bg-secondary);
  border-left: 1px solid var(--color-border);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  z-index: 105;
}

.nav__list--open {
  transform: translateX(0);
}

/* Hamburger to X animation */
.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   TABLET (>= 640px)
   ============================================================ */
@media (min-width: 640px) {
  .skills__grid,
  .projects__grid,
  .certs__grid,
  .testimonials__grid,
  .interests__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .metrics__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .contact__links {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }

  .footer__container {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ============================================================
   DESKTOP (>= 1024px)
   ============================================================ */
@media (min-width: 1024px) {
  /* Show full nav, hide hamburger */
  .nav__toggle {
    display: none;
  }

  .nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    position: static;
    flex-direction: row;
    width: auto;
    padding: 0;
    background-color: transparent;
    border-left: none;
    transform: none;
    transition: none;
  }

  .hero__container {
    grid-template-columns: 1fr 1fr;
  }

  .projects__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .certs__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .interests__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .timeline {
    padding-left: var(--space-2xl);
  }
}