/* ==========================================================================
   Layout — Header, Footer, Nav, Page Structure
   ========================================================================== */

/* --- Header --- */
.site-header {
  background: var(--color-surface-dark);
  width: 100%;
  padding: var(--space-sm) var(--content-padding);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-header .logo {
  flex-shrink: 0;
}

.site-header .logo h1 {
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
  margin: 0;
  white-space: nowrap;
}

.site-header a,
.site-header a:hover,
.site-header a:visited {
  color: var(--color-text-inverse);
  text-decoration: none;
}

/* --- Site Navigation --- */
.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.site-nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.site-nav__hamburger {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text-inverse);
  position: relative;

  &::before,
  &::after {
    content: "";
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text-inverse);
    position: absolute;
    left: 0;
    transition: transform var(--transition-fast);
  }

  &::before { top: -6px; }
  &::after { top: 6px; }
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__link {
  display: block;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: color-mix(in srgb, var(--color-text-inverse) 70%, transparent);
  text-decoration: none;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;

  &:hover {
    color: var(--color-text-inverse);
    background: color-mix(in srgb, var(--color-text-inverse) 10%, transparent);
  }

  &:visited {
    color: color-mix(in srgb, var(--color-text-inverse) 70%, transparent);
  }

  &:visited:hover {
    color: var(--color-text-inverse);
  }
}

.site-nav__link--active {
  color: var(--color-text-inverse);
  background: color-mix(in srgb, var(--color-text-inverse) 12%, transparent);

  &:visited {
    color: var(--color-text-inverse);
  }
}

/* --- Language Switcher --- */
.lang-switcher {
  flex-shrink: 0;

  ul {
    display: flex;
    gap: 3px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  li {
    list-style: none;
  }

  a {
    display: block;
    padding: 1px 6px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.04em;
    color: color-mix(in srgb, var(--color-text-inverse) 60%, transparent);
    border: 1px solid color-mix(in srgb, var(--color-text-inverse) 15%, transparent);
    transition: all var(--transition-fast);

    &:hover {
      color: var(--color-text-inverse);
      background: color-mix(in srgb, var(--color-text-inverse) 10%, transparent);
    }
  }

  .lang-switcher__item--active a {
    background: var(--color-accent);
    color: var(--color-surface-dark);
    border-color: var(--color-accent);
  }
}

/* --- Mobile Nav --- */
@media (max-width: 768px) {
  .site-header {
    flex-wrap: wrap;
    padding: var(--space-sm) var(--content-padding);
  }

  .site-nav {
    flex: 1;
    justify-content: flex-start;
  }

  .site-nav__toggle {
    display: block;
  }

  .site-nav__list {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface-dark);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-sm) var(--content-padding);
    gap: 0;
    border-top: 1px solid color-mix(in srgb, var(--color-text-inverse) 10%, transparent);
    box-shadow: var(--shadow-lg);
    z-index: 100;
  }

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

  .site-nav__link {
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
  }

  .site-nav {
    position: relative;
  }
}

/* --- Main Content --- */
.site-main {
  flex: 1;
  width: 100%;
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding: var(--space-lg) var(--content-padding);
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  width: 100%;
  padding: var(--space-2xl) var(--content-padding);
  text-align: center;
  font-size: var(--font-size-sm);
  margin-top: auto;

  a,
  a:hover,
  a:visited {
    color: var(--color-text-inverse);
  }
}