/* ===== Layout: container, header, footer ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.container--narrow {
  max-width: 560px;
}

/* ----- Header ----- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  background: rgba(13, 13, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: transform var(--duration-normal) var(--ease-out),
              background var(--duration-normal);
}

.site-header.hidden {
  transform: translateY(-100%);
}

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

.nav__logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}
.nav__logo:hover {
  color: var(--accent);
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
}
.nav__links a:hover {
  color: var(--text-primary);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}
.nav__toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform var(--duration-normal), opacity var(--duration-fast);
}

.nav--open .nav__toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav--open .nav__toggle span:nth-child(2) {
  opacity: 0;
}
.nav--open .nav__toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: var(--space-xl);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    gap: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--duration-normal) var(--ease-out),
                opacity var(--duration-normal),
                visibility var(--duration-normal);
  }
  .nav--open .nav__links {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav__toggle {
    display: flex;
  }
}

/* ----- Footer ----- */
.site-footer {
  padding: var(--space-xl) var(--space-lg);
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.site-footer a {
  color: var(--text-secondary);
}