/* Layout — structure, grid, responsive breakpoints */

body {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-void);
  overflow-x: hidden;
}

/* Star-field background — subtle animated particles */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.15) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 10%, rgba(255,255,255,0.12) 0%, transparent 100%),
    radial-gradient(1px 1px at 40% 70%, rgba(255,255,255,0.1) 0%, transparent 100%),
    radial-gradient(1px 1px at 65% 50%, rgba(255,255,255,0.08) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 10% 85%, rgba(74,158,255,0.12) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 60%, rgba(240,200,80,0.08) 0%, transparent 100%);
  background-size: 300px 300px, 400px 400px, 250px 350px, 350px 250px, 500px 500px, 450px 300px;
  animation: starDrift 120s linear infinite;
  pointer-events: none;
}

[data-theme="light"] body::before {
  opacity: 0;
}

@keyframes starDrift {
  from { transform: translateY(0); }
  to { transform: translateY(-300px); }
}

/* Ambient nebula glow */
body::after {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  z-index: -1;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(74, 158, 255, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(140, 80, 220, 0.02) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 80%, rgba(240, 200, 80, 0.015) 0%, transparent 45%);
  pointer-events: none;
}

[data-theme="light"] body::after {
  opacity: 0;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--wide {
  max-width: var(--container-wide);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--duration-normal) var(--ease-out);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.nav__brand svg {
  width: 28px;
  height: 28px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Main content offset for fixed nav */
main {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

/* Page sections */
.section {
  padding: var(--space-3xl) 0;
}

.section--hero {
  padding: 0;
  min-height: calc(100vh - var(--nav-height));
  display: flex;
  align-items: center;
}

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

@media (min-width: 540px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  .grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Footer */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-faint);
  font-size: var(--text-sm);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

/* Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-reveal) var(--ease-out),
              transform var(--duration-reveal) var(--ease-out);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for grid children */
.reveal-stagger > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > *:nth-child(2) { transition-delay: 60ms; }
.reveal-stagger > *:nth-child(3) { transition-delay: 120ms; }
.reveal-stagger > *:nth-child(4) { transition-delay: 180ms; }
.reveal-stagger > *:nth-child(5) { transition-delay: 240ms; }
.reveal-stagger > *:nth-child(6) { transition-delay: 300ms; }
.reveal-stagger > *:nth-child(7) { transition-delay: 360ms; }
.reveal-stagger > *:nth-child(8) { transition-delay: 420ms; }