/* layout.css — site chrome: header, sidebars, page grid */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  height: var(--header-h);
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border);
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header__inner {
  width: min(var(--shell-max), calc(100% - 40px));
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-4);
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--text-primary);
  min-width: 0;
}

/* Wordmark logo replaces mark + text */
.brand.lim-logo {
  color: var(--logo-color);
}

.brand__text {
  display: none;
}

.brand__mark {
  display: none;
}

.site-header__lead {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  justify-self: start;
}

.header-links {
  display: flex;
  align-items: stretch;
  align-self: stretch;
  gap: var(--space-4);
  height: 100%;
}

.header-links--center {
  justify-self: center;
}

.header-links a {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--duration-fast) var(--ease-standard);
  box-sizing: border-box;
}

.header-links a:hover,
.header-links a[aria-current="page"] {
  color: var(--text-primary);
}

.header-links a[aria-current="page"] {
  border-bottom-color: var(--accent);
}

.header-links a.is-research {
  gap: 8px;
}

.header-badge {
  display: inline-flex;
  align-items: center;
  min-height: 18px;
  padding: 0 7px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  background: transparent;
  line-height: 1;
}

.header-badge--progress {
  color: var(--warning, #b7791f);
  border-color: color-mix(in srgb, var(--warning, #b7791f) 35%, var(--border));
}

.home-header .header-links a {
  color: var(--hero-muted);
}

:root[data-theme="day"] .home-header:not(.is-scrolled) .header-links a,
:root[data-theme="light"] .home-header:not(.is-scrolled) .header-links a {
  color: var(--text-secondary);
}

:root[data-theme="day"] .home-header:not(.is-scrolled) .header-links a:hover,
:root[data-theme="day"] .home-header:not(.is-scrolled) .header-links a[aria-current="page"],
:root[data-theme="light"] .home-header:not(.is-scrolled) .header-links a:hover,
:root[data-theme="light"] .home-header:not(.is-scrolled) .header-links a[aria-current="page"] {
  color: var(--text-primary);
}

.home-header .header-links a:hover,
.home-header .header-links a[aria-current="page"] {
  color: var(--hero-text);
}

.home-header.is-scrolled .header-links a {
  color: var(--text-secondary);
}

.home-header.is-scrolled .header-links a:hover,
.home-header.is-scrolled .header-links a[aria-current="page"] {
  color: var(--text-primary);
}

@media (max-width: 720px) {
  .header-links {
    display: none;
  }

  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-self: end;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  display: inline-grid;
  place-items: center;
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard);
}

.icon-btn:hover {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

.theme-toggle__icon {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  transition:
    opacity var(--duration-medium) var(--ease-standard),
    transform var(--duration-medium) var(--ease-standard);
}

.theme-toggle {
  position: relative;
}

.theme-toggle__icon--sun { opacity: 1; transform: scale(1); }
.theme-toggle__icon--moon { opacity: 0; transform: scale(0.75); }

[data-theme="dark"] .theme-toggle__icon--sun {
  opacity: 0;
  transform: scale(0.75);
}

[data-theme="dark"] .theme-toggle__icon--moon {
  opacity: 1;
  transform: scale(1);
}

.nav-toggle {
  display: none;
}

/* Legacy mobile drawer removed — fullscreen lim-menu replaces it */
.docs-backdrop {
  display: none !important;
}

.docs {
  width: min(var(--shell-max), calc(100% - 40px));
  margin-inline: auto;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w);
  gap: var(--space-7);
  align-items: start;
  min-height: calc(100vh - var(--header-h));
}

.docs-nav,
.docs-toc {
  position: sticky;
  top: calc(var(--header-h) + var(--space-4));
  max-height: calc(100vh - var(--header-h) - var(--space-6));
  overflow: auto;
  padding: var(--space-6) 0 var(--space-8);
}

.docs-nav__title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin: 0 0 var(--space-4);
}

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

.docs-nav__list a {
  display: block;
  padding: 8px 12px;
  margin: 0 0 2px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.35;
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    color var(--duration-fast) var(--ease-standard);
}

.docs-nav__list a:hover {
  background: var(--surface-subtle);
  color: var(--text-primary);
}

.docs-nav__list a.is-active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 600;
}

.docs-nav__divider {
  height: 1px;
  background: var(--border);
  margin: var(--space-4) 0;
}

.docs-main {
  min-width: 0;
  padding: var(--space-7) 0 var(--space-9);
}

.docs-toc__title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin: 0 0 var(--space-4);
}

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

.docs-toc__list a {
  display: block;
  padding: 6px 0 6px 14px;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
  line-height: 1.35;
  border-left: 2px solid transparent;
  margin-left: -1px;
}

.docs-toc__list a:hover {
  color: var(--text-primary);
}

.docs-toc__list a.is-active {
  color: var(--accent-strong);
  border-left-color: var(--accent);
}

.docs-toc__list .toc-h3 {
  padding-left: 26px;
  font-size: 0.78rem;
}

/* LIM Navigation Card in right TOC */
.docs-toc__list.lim-nav-toc {
  border-left: 0;
}

.docs-toc__list.lim-nav-toc a.lim-nav-card {
  border-left: 0;
  margin-left: 0;
}

.docs-main > .page-hero {
  margin-bottom: var(--space-7);
  max-width: var(--content-max);
}

.page-hero__eyebrow {
  margin: 0 0 var(--space-4);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.page-hero h1 {
  margin-bottom: var(--space-4);
}

.page-hero__lead {
  font-size: var(--text-lg);
  font-weight: var(--lim-font-weight-regular);
  color: var(--text-secondary);
  max-width: 42rem;
  margin: 0;
  line-height: 1.6;
}

.docs-main .section {
  max-width: var(--content-max);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0 calc(var(--space-7) + env(safe-area-inset-bottom, 0px));
}

.site-footer__inner {
  width: min(var(--shell-max), calc(100% - 40px));
  margin-inline: auto;
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  color: var(--text-tertiary);
  font-size: var(--text-sm);
}

/* Home uses a fuller canvas */
.home-shell {
  width: min(var(--shell-max), calc(100% - 40px));
  margin-inline: auto;
}

@media (max-width: 1100px) {
  .docs {
    grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  }

  .docs-toc {
    display: none;
  }
}

@media (max-width: 860px) {
  .docs {
    grid-template-columns: 1fr;
  }

  .docs-nav {
    display: none;
  }

  .brand__text-full { display: none; }
}