/* ============================================
   Layout — Navbar, Sidebar, Content, TOC
   ============================================ */

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.85);
}

[data-theme="dark"] .navbar {
  background: rgba(10, 10, 10, 0.85);
}

.navbar-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--color-text);
}

.navbar-logo {
  font-size: 1.3rem;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.navbar-link {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.navbar-link:hover {
  color: var(--color-text);
  background: var(--color-bg-tertiary);
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  width: 32px;
  height: 32px;
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-border-strong);
  background: var(--color-bg-secondary);
}

[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

/* Page wrapper */
.page-wrapper {
  padding-top: var(--navbar-height);
}

/* Docs three-column layout */
.docs-layout {
  display: flex;
  min-height: calc(100vh - var(--navbar-height));
}

/* Sidebar */
.sidebar {
  position: fixed;
  top: var(--navbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  overflow-y: auto;
  border-right: 1px solid var(--color-border);
  background: var(--color-bg);
  z-index: 50;
}

.sidebar-inner {
  padding: 24px 16px 48px;
}

.sidebar-section {
  margin-bottom: 24px;
}

.sidebar-heading {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  margin-bottom: 8px;
  padding: 0 8px;
}

.sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-item {
  margin: 0;
}

.sidebar-item a {
  display: block;
  padding: 6px 8px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
  font-weight: 400;
}

.sidebar-item a:hover {
  color: var(--color-text);
  background: var(--color-bg-tertiary);
}

.sidebar-item--active a {
  color: var(--color-accent);
  background: var(--color-accent-light);
  font-weight: 500;
}

/* Main content */
.docs-content {
  flex: 1;
  min-width: 0;
  margin-left: var(--sidebar-width);
  padding: 40px 48px 80px;
  display: flex;
  justify-content: center;
}

.docs-article {
  max-width: var(--content-max-width);
  width: 100%;
}

/* Table of contents (right sidebar) */
.docs-toc {
  width: var(--toc-width);
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--navbar-height) + 24px);
  align-self: flex-start;
  max-height: calc(100vh - var(--navbar-height) - 48px);
  overflow-y: auto;
  padding: 40px 24px 24px 0;
  display: none;
}

@media (min-width: 1280px) {
  .docs-toc {
    display: block;
  }
}

.toc-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  margin-bottom: 12px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--color-border);
  padding-left: 12px;
}

.toc-item {
  margin: 0;
}

.toc-item a {
  display: block;
  padding: 3px 0;
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.toc-item a:hover {
  color: var(--color-text);
}

.toc-item--nested a {
  padding-left: 12px;
  font-size: 0.78rem;
}

/* Home layout */
.home-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}