.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background: color-mix(in oklch, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  position: relative;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--s-5);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--s-4);
}

.site-header__start {
  display: contents;
}

.site-header__scroll-title {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  min-width: 0;
  max-width: min(44ch, 72%);
  z-index: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--fs-0);
  font-weight: 650;
  line-height: 1.2;
  color: var(--fg-strong);
  text-align: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition), visibility var(--transition);
}

.site-header__scroll-title.is-visible {
  opacity: 1;
  visibility: visible;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  flex-shrink: 0;
}

.site-header__home-link {
  font-size: var(--fs--1);
  color: var(--muted);
  text-decoration: none;
}
.site-header__home-link:hover { color: var(--link); }

.site-logo {
  font-weight: 700;
  color: var(--fg-strong);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}
.site-logo__dot {
  width: 0.55em;
  height: 0.55em;
  border-radius: 50%;
  background: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  margin-left: auto;
}

.site-nav__account {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  padding: 0.2rem 0.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.site-nav__user {
  font-size: var(--fs--1);
  color: var(--muted);
  max-width: 10rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--s-6) var(--s-5) var(--s-7);
}

.site-main--landing {
  max-width: 42rem;
  text-align: center;
}

.site-main--feed {
  max-width: none;
  padding-left: var(--s-5);
  padding-right: var(--s-5);
}

.note-layout {
  display: grid;
  gap: var(--s-5);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 64rem) {
  .note-layout {
    grid-template-columns: var(--note-sidebar-width) minmax(0, 1fr);
    gap: var(--s-7);
  }
}

.note-layout__content {
  min-width: 0;
  max-width: 52rem;
}

.grid {
  display: grid;
  gap: var(--s-4);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
}

.feed-toc { display: none; }

@media (min-width: 64rem) {
  .feed-toc {
    display: block;
    align-self: start;
    position: sticky;
    top: calc(var(--header-height) + var(--s-4));
    max-height: calc(100vh - var(--header-height) - 2rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    padding-right: var(--s-3);
    border-left: 1px solid var(--border);
    padding-left: var(--s-4);
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
  }
}

.feed-toc__title {
  font-size: var(--fs--1);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  font-weight: 600;
  margin: 0 0 var(--s-3);
}

.feed-toc nav ul,
.feed-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feed-toc__collapsible {
  margin-bottom: var(--s-2);
}

.feed-toc__collapsible > .feed-toc__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--s-2);
  padding: 0.35rem 0.6rem;
  margin-left: -1rem;
  padding-left: calc(0.6rem + 1rem);
  font-size: var(--fs--1);
  font-weight: 600;
  color: var(--fg-strong);
  border-left: 2px solid transparent;
  user-select: none;
}

.feed-toc__collapsible > .feed-toc__summary::-webkit-details-marker {
  display: none;
}

.feed-toc__collapsible > .feed-toc__summary::after {
  content: "▸";
  margin-left: auto;
  font-size: 0.75em;
  color: var(--muted);
  transition: transform var(--transition);
}

.feed-toc__collapsible[open] > .feed-toc__summary::after {
  transform: rotate(90deg);
}

.feed-toc__collapsible > .feed-toc__summary a {
  color: inherit;
  text-decoration: none;
  flex: 1;
  min-width: 0;
}

.feed-toc__collapsible > .feed-toc__summary a:hover {
  color: var(--accent);
}

.feed-toc__collapsible > .feed-toc__summary a.is-active {
  color: var(--accent);
}

.feed-toc__month[open] > .feed-toc__summary {
  border-left-color: var(--border-strong);
  background: transparent;
}

.feed-toc__month[open]:has(.feed-toc__entries a.is-active) > .feed-toc__summary {
  border-left-color: var(--border);
  background: transparent;
}

.feed-toc__month[open] > .feed-toc__summary a.is-active {
  color: var(--accent);
  font-weight: 550;
  border-left: 2px solid var(--accent);
  margin-left: -1rem;
  padding-left: calc(0.6rem + 1rem - 2px);
  background: var(--accent-soft);
}

.feed-toc__years {
  margin-bottom: var(--s-4);
  padding-bottom: var(--s-3);
  border-bottom: 1px solid var(--border);
}

.feed-toc__month-nav {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
}

.feed-toc__entries {
  margin-top: var(--s-1);
  margin-bottom: var(--s-2);
}

.feed-toc__flat-nav {
  margin-top: var(--s-2);
}

.feed-toc__months {
  margin-top: var(--s-4);
  padding-top: var(--s-3);
  border-top: 1px solid var(--border);
}

.feed-toc__item > a {
  display: block;
  padding: 0.3rem 0.6rem;
  color: var(--muted);
  font-size: var(--fs--1);
  line-height: 1.35;
  border-left: 2px solid transparent;
  margin-left: -1rem;
  padding-left: calc(0.6rem + 1rem);
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.feed-toc__item > a:hover {
  color: var(--fg-strong);
  background: var(--surface-2);
}

.feed-toc__item > a.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
  font-weight: 550;
}

.feed-toc__item--l2 > a {
  padding-left: calc(0.6rem + 1rem + var(--s-4));
  font-size: calc(var(--fs--1) - 0.02rem);
}

.landing-hero { margin-bottom: var(--s-6); }
.landing-hero p {
  color: var(--muted);
  font-size: var(--fs-1);
  max-width: 36ch;
  margin-left: auto;
  margin-right: auto;
}

.landing-grid {
  display: grid;
  gap: var(--s-4);
  text-align: left;
}

@media (min-width: 36rem) {
  .landing-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-head { margin-bottom: var(--s-5); }
.page-head__lead { color: var(--muted); }