/* ================================================================== */
/* 3. LAYOUT                                                           */
/* ================================================================== */

.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--width-main);
  margin: 0 auto;
  padding: var(--sp-4) var(--space-page);
}

.site-nav-wrap { border-bottom: var(--border-width) solid var(--c-border); }

.journal-name {
  font-weight: 600;
  font-size: var(--fs-lg);
  letter-spacing: -0.01em;
  color: var(--c-text);
  text-decoration: none;
  white-space: nowrap;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  font-size: var(--fs-sm);
}

.nav-actions a,
.nav-actions button {
  color: var(--c-text);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--fs-sm);
}

.nav-actions a:hover,
.nav-actions button:hover {
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.page-layout {
  margin: var(--sp-8) auto;
  padding: 0 var(--space-page);
  max-width: var(--width-main);
}

.page-layout.has-toc {
  display: grid;
  grid-template-columns: 1fr var(--width-toc);
  gap: var(--sp-8);
  max-width: calc(var(--width-main) + var(--sp-8) + var(--width-toc));
  align-items: start;
}

main { min-width: 0; }

footer {
  text-align: center;
  padding: var(--sp-7);
  font-size: var(--fs-sm);
  color: var(--c-text-muted);
  border-top: var(--border-width) solid var(--c-border);
  margin-top: var(--sp-10);
}

footer a { color: var(--c-text-muted); }

.article-workspace h1 { margin-bottom: var(--sp-2); }
.workspace-header { margin-bottom: var(--sp-7); }

.workspace-grid {
  display: grid;
  grid-template-columns: var(--width-sidebar) 1fr;
  gap: var(--sp-8);
  align-items: start;
}

.workspace-aside { order: -1; position: sticky; top: 1.5rem; }

.workspace-aside > section:first-child h2,
.workspace-aside > section:first-child > h2 { margin-top: 0; }

@media (max-width: 760px) {
  .workspace-grid  { grid-template-columns: 1fr; }
  .workspace-aside { order: 0; position: static; }
}

.page-toc {
  position: sticky;
  top: 1.5rem;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
}

.page-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-toc a {
  display: block;
  padding: var(--sp-1) var(--sp-3);
  border-left: var(--border-width-strong) solid var(--c-border);
  color: var(--c-text-muted);
  font-size: var(--fs-sm);
  text-decoration: none;
  line-height: var(--lh-relaxed);
}

.page-toc a:hover {
  color: var(--c-link);
  border-left-color: var(--c-link);
  text-decoration: none;
}

@media (max-width: 900px) {
  .page-layout.has-toc { grid-template-columns: 1fr; }
  .page-toc { display: none; }
}

.workspace-meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-2);
}

.meta-date { font-size: var(--fs-sm); color: var(--c-text-muted); }
.meta-id   { font-size: var(--fs-sm); color: var(--c-text-muted); letter-spacing: 0.02em; }