/* --- Layout: containers, header, footer --- */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.main {
  min-height: calc(100vh - 200px);
  padding-top: var(--space-12);
  padding-bottom: var(--space-16);
}

/* --- Site header --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(90deg, #2563eb, #7c3aed, #06b6d4) 1;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.92);
}

@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(10, 10, 10, 0.92);
  }
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-logo:hover {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
}

.nav-rss {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  padding: 2px 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: all var(--transition-base);
}

/* --- Site footer --- */

.site-footer {
  border-top: 2px solid transparent;
  border-image: linear-gradient(90deg, #2563eb, #7c3aed, #06b6d4) 1;
  padding: var(--space-8) 0;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer-version {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  opacity: 0.75;
  margin-left: var(--space-2);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-accent);
}

/* --- Mobile responsive --- */

@media (max-width: 640px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-6);
    gap: var(--space-1);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav .nav-link {
    padding: var(--space-3) 0;
    font-size: var(--text-base);
  }

  .footer-content {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}