docs/_sass/_layout.scss

.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

// ── Header ─────────────────────────────────────────────
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: $header-height;
  background: $solr-dark;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.35);

  .header-inner {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 $sp4;
    gap: $sp3;
  }
}

.site-logo {
  display: flex;
  align-items: center;
  gap: $sp3;
  text-decoration: none;
  flex-shrink: 0;

  img { height: 32px; width: auto; }

  .site-name {
    color: rgba(255,255,255,0.55);
    font-size: 0.8125rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    border-left: 1px solid rgba(255,255,255,0.2);
    padding-left: $sp3;
    white-space: nowrap;
  }

  &:hover { text-decoration: none; .site-name { color: rgba(255,255,255,0.85); } }
}

.header-spacer { flex: 1; }

.header-links {
  display: flex;
  align-items: center;
  gap: $sp2;
}

.header-link {
  color: rgba(255,255,255,0.7);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 5px $sp3;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.2);
  white-space: nowrap;
  transition: all 0.15s;
  &:hover {
    color: #fff;
    border-color: rgba(255,255,255,0.5);
    background: rgba(255,255,255,0.1);
    text-decoration: none;
  }
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  padding: 5px 9px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1.05rem;
  line-height: 1;
  &:hover { background: rgba(255,255,255,0.1); }
}

// ── Page body ──────────────────────────────────────────
.page-body {
  display: flex;
  flex: 1;
  padding-top: $header-height;
}

// ── Sidebar ────────────────────────────────────────────
.sidebar {
  position: fixed;
  top: $header-height; left: 0; bottom: 0;
  width: $sidebar-width;
  background: $sidebar-bg;
  border-right: 1px solid $sidebar-border;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 100;

  &::-webkit-scrollbar { width: 4px; }
  &::-webkit-scrollbar-track { background: transparent; }
  &::-webkit-scrollbar-thumb { background: $border-color; border-radius: 2px; }
}

.sidebar-inner { padding: $sp4 0 $sp6; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
}

// ── Main content ───────────────────────────────────────
.content {
  margin-left: $sidebar-width;
  flex: 1;
  min-width: 0;
}

.content-inner {
  max-width: $content-max-width;
  padding: $sp6;
}

// ── Footer ─────────────────────────────────────────────
.site-footer {
  background: $solr-dark;
  color: rgba(255,255,255,0.6);
  padding: $sp5 $sp6;
  font-size: 0.875rem;
  line-height: 1.7;
  margin-left: $sidebar-width;

  a { color: rgba(255,255,255,0.75); &:hover { color: #fff; } }
  p { margin-bottom: $sp2; &:last-child { margin-bottom: 0; } }
}

// ── Back to top ────────────────────────────────────────
.back-to-top {
  position: fixed;
  bottom: $sp4; right: $sp4;
  background: $solr-orange;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 40px; height: 40px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  z-index: 500;
  transition: background 0.15s;
  &:hover { background: $solr-orange-dark; }
  &.visible { display: flex; }
}