:root {
  --paper: #f8f8f8;
  --surface: #ffffff;
  --sidebar: #f3f3f3;
  --ink: #18181b;
  --muted: #6b6b72;
  --faint: #96969d;
  --line: #e2e2e5;
  --line-strong: #d2d2d6;
  --accent: #0ba881;
  --acid: var(--accent);
  --acid-soft: color-mix(in srgb, var(--accent) 16%, var(--paper));
  --header-height: 52px;
  --tree-width: 288px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper: #101010;
  --surface: #181818;
  --sidebar: #141414;
  --ink: #eeeeef;
  --muted: #aaaaaf;
  --faint: #7c7c82;
  --line: #2d2d30;
  --line-strong: #3c3c40;
  --acid: color-mix(in srgb, var(--accent) 78%, white);
  --acid-soft: color-mix(in srgb, var(--accent) 20%, var(--surface));
  color-scheme: dark;
}

::selection {
  background: var(--accent);
  color: var(--paper);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: background 0.22s ease, color 0.22s ease;
}

button,
a {
  color: inherit;
  font: inherit;
}

button {
  border: 0;
}

a {
  text-decoration: none;
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.site-shell {
  min-height: 100vh;
}

.site-shell.doc-mode {
  height: 100dvh;
  min-height: 0;
  overflow: hidden;
}

.site-shell.doc-mode > [data-page-root] {
  min-height: 0;
}

.section-wrap {
  width: min(1490px, calc(100% - 112px));
  margin-inline: auto;
}

/* Header */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  padding: 0 max(56px, calc((100vw - 1490px) / 2));
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(14px);
}

.site-shell.doc-mode .topbar {
  background: color-mix(in srgb, var(--paper) 97%, transparent);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--line) 65%, transparent);
}

.brand {
  justify-self: start;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 13px;
  background: transparent;
  cursor: pointer;
  font: 720 12px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.mark {
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 11px;
  background: var(--ink);
  color: var(--paper);
  font: 760 20px/1 Inter, "Noto Sans SC", system-ui, sans-serif;
}

.mark-small {
  width: 25px;
  height: 25px;
  border-radius: 7px;
  font-size: 11px;
}

.nav {
  align-self: stretch;
  display: flex;
  gap: 34px;
}

.nav a {
  padding: 2px 0 0;
  display: flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
}

.nav a:hover,
.nav a.active {
  border-color: var(--ink);
  color: var(--ink);
}

.header-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 9px;
}

.accent-picker {
  position: relative;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  cursor: pointer;
}

.accent-picker::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid color-mix(in srgb, var(--ink) 36%, transparent);
  border-radius: 50%;
  background: var(--accent);
  pointer-events: none;
}

.accent-picker:focus-within {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.accent-picker input {
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  opacity: 0;
  cursor: pointer;
}

.theme-toggle {
  position: relative;
  width: 54px;
  height: 28px;
  padding: 3px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  cursor: pointer;
}

.theme-toggle::after {
  content: "";
  position: absolute;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--ink);
  transition: transform 0.22s ease;
}

:root[data-theme="dark"] .theme-toggle::after {
  transform: translateX(26px);
}

.theme-toggle span {
  z-index: 1;
  width: 20px;
  color: var(--ink);
  font-size: 15px;
  line-height: 1;
}

.menu-toggle {
  display: none;
  padding: 4px 0 4px 18px;
  background: transparent;
  cursor: pointer;
  font-size: 23px;
}

.page-progress {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  z-index: 110;
  height: 2px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.page-progress span {
  width: 100%;
  height: 100%;
  display: block;
  background: var(--acid);
  box-shadow: 0 0 10px color-mix(in srgb, var(--acid) 58%, transparent);
  transform: scaleX(var(--page-progress, 0));
  transform-origin: left center;
  transition: transform 0.22s ease;
}

.page-progress.is-visible {
  opacity: 1;
}

.page-progress.is-error span {
  background: #ff5a67;
}

/* Home */
.home-main {
  min-height: calc(100vh - var(--header-height) - 110px);
  display: flex;
  align-items: center;
}

.intro {
  width: 100%;
  padding: 62px 0 56px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font: 650 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.16em;
}

.eyebrow i {
  width: 72px;
  height: 1px;
  display: block;
  background: var(--line-strong);
}

.intro-grid {
  padding-top: 42px;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.55fr);
  align-items: center;
  gap: clamp(70px, 9vw, 150px);
}

.intro-copy h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(58px, 6.2vw, 101px);
  font-weight: 620;
  line-height: 0.96;
  letter-spacing: -0.068em;
}

.intro-copy h1 em {
  font: inherit;
  font-weight: 700;
}

.intro-copy h1 .hero-accent {
  color: var(--accent);
}

.hero-reading::after {
  content: "";
  display: inline-block;
  width: 0.075em;
  height: 0.82em;
  margin-left: 0.08em;

  background: currentColor;
  vertical-align: -0.04em;

  animation: hero-cursor-blink 1s steps(1, end) infinite;
}

@keyframes hero-cursor-blink {
  0%,
  49% {
    opacity: 1;
  }

  50%,
  100% {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-reading::after {
    animation: none;
  }
}

.lead {
  max-width: 690px;
  margin: 37px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.9;
}

.intro-actions {
  margin-top: 39px;
  display: flex;
  align-items: center;
  gap: 38px;
}

.button {
  min-width: 190px;
  padding: 17px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 45px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 650;
}

.button-solid {
  background: var(--ink);
  color: var(--paper);
}

.text-link {
  padding-block: 7px;
  border-bottom: 1px solid var(--ink);
  font-size: 14px;
}

.recent-line {
  margin-top: 16px;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  text-align: left;
  font: 500 10px/1.35 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.06em;
}

.recent-line span {
  text-transform: uppercase;
  letter-spacing: 0.13em;
}

.recent-line time::before {
  content: "·";
  margin-right: 12px;
}

.recent-line strong {
  color: var(--ink);
  font-weight: 600;
}

.recent-line i {
  font-style: normal;
  transition: transform 0.18s ease;
}

.recent-line:hover i {
  transform: translate(2px, -2px);
}

.about-note {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
  box-shadow: 0 16px 45px rgb(17 16 40 / 0.07);
}

.about-note-bottom {
  margin-top: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.about-note-bottom .status {
  margin-top: 0;
}

.about-more {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--line-strong);
  gap: 6px;

  color: var(--muted);
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;

  transition: color 0.16s ease;
}

.about-more i {
  font-style: normal;
  transition: transform 0.16s ease;
}

.about-more:hover {
  color: var(--ink);
  border-color: var(--ink);
  color: var(--ink);
}

.about-more:hover i {
  transform: translate(2px, -2px);
}

.note-top {
  padding-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font: 600 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.about-note .note-top .mark {
  position: relative;
  width: 42px;
  height: 42px;
  display: block;
  flex: 0 0 auto;

  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 6px;

  background: var(--paper);
  color: inherit;
  font: inherit;
}

.about-note .note-top .mark img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;

  filter: saturate(0.82) contrast(0.98);
}

.about-note .note-top .mark::after {
  content: "";
  position: absolute;
  right: 3px;
  bottom: 3px;

  width: 6px;
  height: 6px;

  border: 1px solid var(--surface);
  border-radius: 50%;
  background: var(--accent);
}

.about-note p {
  margin: 25px 0;
  font-size: 16px;
  line-height: 1.75;
}

.status {
  margin-top: 34px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.status i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--acid);
  box-shadow: 0 0 0 1px var(--ink);
}

.footer {
  min-height: 110px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

:root[data-theme="dark"] .about-note {
  box-shadow: none;
}

/* Document workspace */
.collection-workspace {
  height: calc(100dvh - var(--header-height));
  min-height: 0;
  overflow: hidden;
  display: grid;
  grid-template-columns: var(--tree-width) minmax(0, 1fr);
  background: var(--paper);
}

.mobile-docbar,
.tree-mobile-close {
  display: none;
}

.tree-scrim {
  position: fixed;
  inset: 0;
  z-index: 150;
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  background: rgb(8 12 9 / 0.42);
  opacity: 0;
  cursor: default;
  transition: opacity 0.22s ease;
  backdrop-filter: blur(2px);
}

.tree-scrim.is-visible {
  opacity: 1;
}

.tree-panel {
  min-height: 0;
  padding: 20px 14px 34px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  border-right: 1px solid var(--line);
  background: var(--sidebar);
}

.tree-panel-head {
  min-height: 28px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.panel-label {
  display: block;
  color: var(--faint);
  font: 650 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

/* Page outline */
.outline-panel {
  position: fixed;
  inset: 0 0 0 auto;
  z-index: 160;
  width: min(88vw, 336px);
  min-height: 0;
  padding: 24px 19px 36px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-left: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--sidebar) 94%, transparent);
  box-shadow: -18px 0 50px rgb(0 0 0 / 0.13);
  transform: translateX(104%);
  transition: transform 0.22s ease;
  backdrop-filter: blur(18px);
}

.outline-panel.is-open {
  transform: translateX(0);
}

body.tree-drawer-open,
body.outline-drawer-open {
  overflow: hidden;
}

.outline-progress {
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: var(--line);
}

.outline-progress span {
  width: 100%;
  height: 100%;
  display: block;
  background: var(--acid);
  transform: scaleX(var(--outline-progress, 0));
  transform-origin: left center;
  transition: transform 0.12s linear;
}

.outline-panel-head {
  min-height: 34px;
  margin: 0 3px 20px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.outline-panel-head .panel-label {
  padding-top: 5px;
}

.outline-close {
  width: 29px;
  height: 29px;
  margin: -7px -5px 6px 0;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 21px;
}

.outline-close:hover {
  background: color-mix(in srgb, var(--ink) 6%, transparent);
  color: var(--ink);
}

.outline-list {
  display: grid;
  gap: 2px;
}

.outline-link {
  min-width: 0;
  min-height: 39px;
  padding: 8px 7px 8px calc(5px + var(--outline-depth) * 14px);
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.outline-link:hover {
  background: color-mix(in srgb, var(--ink) 5%, transparent);
  color: var(--ink);
}

.outline-link > i {
  width: 5px;
  height: 5px;
  border: 1px solid var(--faint);
  border-radius: 50%;
  transition: border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.outline-link > span {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.outline-link > small {
  color: var(--faint);
  font: 550 8px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.outline-link.is-active,
.outline-link[aria-current="location"] {
  background: var(--acid-soft);
  color: var(--ink);
  font-weight: 650;
}

.outline-link.is-active > i,
.outline-link[aria-current="location"] > i {
  border-color: var(--ink);
  background: var(--acid);
  transform: scale(1.28);
}

.tree-panel .panel-label {
  margin: 4px 10px 15px;
}

.tree-list {
  min-width: 0;
}

.tree-item {
  min-width: 0;
}

.tree-node-row {
  min-width: 0;
  min-height: 37px;
  margin: 1px 0;
  padding-left: min(calc(var(--tree-depth) * 15px), 90px);
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: stretch;
  border-radius: 7px;
  color: var(--muted);
}

.tree-node-row:hover {
  background: color-mix(in srgb, var(--ink) 5%, transparent);
  color: var(--ink);
}

.tree-node-row.selected {
  background: var(--acid-soft);
  color: var(--ink);
}

.tree-node-row.selected::before {
  content: "";
  position: absolute;
}

.tree-node-toggle,
.tree-node-toggle-spacer {
  width: 22px;
  min-height: 37px;
  display: grid;
  place-items: center;
  align-self: stretch;
}

.tree-node-toggle {
  padding: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--faint);
  cursor: pointer;
}

.tree-node-toggle:hover {
  color: var(--ink);
}

.tree-node-toggle span {
  display: block;
  font-size: 17px;
  line-height: 1;
  transition: transform 0.18s ease;
}

.tree-node-toggle[aria-expanded="true"] span {
  transform: rotate(90deg);
}

.tree-node-main {
  min-width: 0;
  padding: 7px 9px 7px 3px;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  align-items: center;
  gap: 7px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.tree-kind-icon {
  position: relative;
  width: 15px;
  height: 15px;
  display: block;
  color: currentColor;
  opacity: 0.82;
}

.tree-kind-icon.is-document {
  width: 12px;
  height: 15px;
  margin-left: 1px;
  border: 1.25px solid currentColor;
  border-radius: 2px;
}

.tree-kind-icon.is-document::after {
  content: "";
  position: absolute;
  top: 2px;
  right: 2px;
  width: 4px;
  height: 1px;
  background: currentColor;
  box-shadow: 0 3px 0 currentColor, 0 6px 0 currentColor;
  opacity: 0.55;
}

.tree-kind-icon.is-folder {
  width: 15px;
  height: 11px;
  margin-top: 3px;
  border: 1.25px solid currentColor;
  border-radius: 2px;
}

.tree-kind-icon.is-folder::before {
  content: "";
  position: absolute;
  top: -4px;
  left: -1.25px;
  width: 7px;
  height: 4px;
  border: 1.25px solid currentColor;
  border-bottom: 0;
  border-radius: 2px 2px 0 0;
  background: var(--sidebar);
}

.tree-node-row.selected .tree-kind-icon.is-folder::before,
.tree-node-row:hover .tree-kind-icon.is-folder::before {
  background: color-mix(in srgb, var(--sidebar) 88%, var(--acid-soft));
}

.tree-node-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tree-node-copy strong {
  overflow: hidden;
  font-size: 12px;
  font-weight: 580;
  line-height: 1.35;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.tree-node-copy small {
  overflow: hidden;
  color: var(--faint);
  font-size: 9px;
  line-height: 1.35;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.tree-node-row.selected .tree-node-copy strong {
  font-weight: 680;
}

.tree-children {
  position: relative;
}

.tree-children::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 3px;
  left: min(calc(17px + var(--tree-depth, 0) * 15px), 107px);
  width: 1px;
  background: var(--line-strong);
  opacity: 0.65;
}

.document-preview {
  min-width: 0;
  min-height: 0;
  padding: 24px clamp(24px, 4vw, 62px) 42px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
  background: var(--paper);
}

.document-entry-row {
  width: min(900px, 100%);
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.document-entry-label {
  color: var(--muted);
}

.outline-trigger {
  padding: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--faint);
  cursor: pointer;
  font: 620 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.1em;
}

.outline-trigger strong {
  min-width: 22px;
  height: 18px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--muted);
  font-size: 8px;
  letter-spacing: 0;
}

.outline-trigger i {
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
  transition: transform 0.16s ease;
}

.outline-trigger:hover {
  color: var(--ink);
}

.outline-trigger:hover i {
  transform: translateX(2px);
}

.doc-body {
  width: min(900px, 100%);
  margin: 0 auto;
  padding: clamp(30px, 4.8vh, 48px) clamp(30px, 6vw, 76px) 66px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
  box-shadow: 0 18px 50px rgb(17 16 40 / 0.045);
  animation: doc-in 0.26s ease both;
}

:root[data-theme="dark"] .doc-body {
  box-shadow: none;
}

.breadcrumbs {
  max-width: 720px;
  margin-top: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  color: var(--faint);
  font-size: 10px;
  line-height: 1.4;
}

.breadcrumbs a {
  color: var(--muted);
}

.breadcrumbs a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.breadcrumbs i {
  font-style: normal;
  opacity: 0.55;
}

.document-preview h1 {
  max-width: 720px;
  margin: 16px 0 13px;
  font-size: clamp(36px, 4vw, 50px);
  font-weight: 730;
  line-height: 1.12;
  letter-spacing: -0.038em;
}

.document-preview p {
  max-width: 720px;
  color: var(--muted);
  font-size: 15px;
  line-height: 2;
}

.doc-lead {
  position: relative;
  max-width: 720px;
  margin: 0;
  padding: 13px 24px 9px 20px;
  border-block: 1px solid var(--line);
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--acid) 9%, transparent),
    transparent 72%
  );
  color: color-mix(in srgb, var(--muted) 86%, var(--ink));
  font-size: 11px !important;
  line-height: 1.8 !important;
  letter-spacing: 0.01em;
}

.doc-lead::before {
  content: "ABSTRACT / ";
  display: block;
  color: var(--faint);
  font: 650 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.14em;
}

.doc-lead::after {
  content: "";
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: 0;
  width: 3px;
  background: linear-gradient(
    to bottom,
    var(--ink) 0 32%,
    var(--acid) 32% 100%
  );
}

.doc-content {
  max-width: 720px;
  margin-top: 35px;
}

.doc-content [data-outline-heading] {
  scroll-margin-top: 30px;
}

.doc-content h2[data-outline-heading] {
  position: relative;
  margin: 3.2em 0 1.2em;
  padding-top: 1.7em;
  border-top: 1px solid var(--line);
  font-size: clamp(22px, 2.2vw, 27px);
  font-weight: 735;
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.doc-content h2[data-outline-heading]::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 32px;
  height: 3px;
  border-radius: 999px;
  background: var(--acid);
}

.doc-content > h2[data-outline-heading]:first-child {
  margin-top: 0;
}

.doc-content p {
  margin: 0;
}

.doc-content p + p {
  margin-top: 1.15em;
}

.doc-content h3,
.doc-content h4,
.doc-content h5,
.doc-content h6 {
  margin: 1.5em 0 12px;
  color: var(--ink);
  font-weight: 680;
  line-height: 1.4;
  text-wrap: balance;
}

.doc-content h3[data-outline-heading] {
  position: relative;
  padding-left: 15px;
  font-size: 20px;
  letter-spacing: -0.012em;
}

.doc-content h3[data-outline-heading]::before {
  content: "";
  position: absolute;
  top: 0.2em;
  bottom: 0.2em;
  left: 0;
  width: 2px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--acid) 72%, var(--line-strong));
}

.doc-content h4[data-outline-heading] {
  position: relative;
  display: block;
  margin: 1.6em 0 0.82em;
  padding-left: 21px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: 0.025em;
}

.doc-content h4[data-outline-heading]::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 2px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--acid);
  background: color-mix(in srgb, var(--acid) 5%, transparent);
  transform: rotate(45deg);
}

.doc-content h5 {
  position: relative;
  margin: 2.45em 0 0.78em;
  padding-left: 31px;
  color: color-mix(in srgb, var(--ink) 72%, var(--acid));
  font-size: 13px;
  font-weight: 700;
  line-height: 1.65;
  letter-spacing: 0.1em;
}

.doc-content h5::before {
  content: "";
  position: absolute;
  top: 0.82em;
  left: 0;
  width: 19px;
  height: 1px;
  background: var(--acid);
  box-shadow: 5px 3px 0 color-mix(in srgb, var(--acid) 30%, transparent);
}

.doc-content h6 {
  margin: 2.2em 0 0.72em;
  padding-left: 12px;
  border-left: 1px solid color-mix(in srgb, var(--acid) 70%, var(--line-strong));
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.7;
  letter-spacing: 0.08em;
}

.doc-content h4[data-outline-heading] .heading-anchor {
  vertical-align: 0.08em;
}

.doc-content h4[data-outline-heading]:hover::before {
  background: var(--acid);
}

.doc-content h4[data-outline-heading]::before,
.doc-content h5::before {
  transition: background-color 0.16s ease, border-color 0.16s ease;
}

.doc-content h5,
.doc-content h6 {
  scroll-margin-top: 30px;
}

.doc-content strong {
  color: var(--ink);
  font-weight: 720;
}

.doc-content mark {
  padding: 0.08em 0.22em;
  border-radius: 2px;
  background: color-mix(in srgb, var(--acid) 22%, transparent);
  color: var(--ink);
}

.doc-content del {
  color: var(--faint);
  text-decoration-color: color-mix(in srgb, var(--faint) 70%, transparent);
}

.doc-content .heading-anchor {
  margin-left: 0.42em;
  padding: 0 0.1em;
  background: transparent;
  color: var(--faint);
  font: 500 0.68em/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-decoration: none;
  opacity: 0;
  transition: color 0.16s ease, opacity 0.16s ease;
}

.doc-content [data-outline-heading]:hover .heading-anchor,
.doc-content .heading-anchor:focus-visible {
  color: var(--ink);
  opacity: 1;
}

.doc-content blockquote {
  margin: 36px 0 8px;
  padding: 18px 20px;
  border-left: 3px solid var(--acid);
  border-radius: 0 8px 8px 0;
  background: color-mix(in srgb, var(--acid) 9%, var(--paper));
  color: var(--ink);
  font-size: 15px;
  line-height: 1.8;
}

.doc-content ul,
.doc-content ol {
  margin: 10px 0 0;
  padding-left: 12px;
  color: var(--muted);
  font-size: 15px;
  line-height: 2;
}

.doc-content li > ul,
.doc-content li > ol {
  margin-top: 0;
}

.doc-content li::marker {
  color: var(--faint);
  font: 600 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.doc-content hr {
  height: 15px;
  margin: 52px 0;
  border: 0;
  background:
    radial-gradient(circle, var(--acid) 0 2px, var(--surface) 2.5px 6px, transparent 6.5px) center / 15px 15px no-repeat,
    linear-gradient(var(--line-strong), var(--line-strong)) center / 100% 1px no-repeat;
  opacity: 0.9;
}

.doc-content :not(pre) > code {
  padding: 0.16em 0.4em;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: color-mix(in srgb, var(--paper) 75%, var(--acid-soft));
  color: var(--ink);
  font: 0.88em/1.5 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.doc-content pre {
  max-width: 100%;
  margin: 26px 0;
  padding: 18px 20px;
  overflow-x: auto;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: color-mix(in srgb, var(--ink) 94%, var(--paper));
  color: var(--paper);
  font: 12px/1.75 ui-monospace, SFMono-Regular, Consolas, monospace;
  tab-size: 2;
}

.doc-content pre code {
  color: inherit;
  font: inherit;
}

.doc-content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 28px 0;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--paper);
  box-shadow: 0 14px 36px rgb(17 16 40 / 0.08);
}

:root[data-theme="dark"] .doc-content img {
  box-shadow: none;
}

.table-scroll {
  max-width: 100%;
  margin: 20px 0 28px;
  overflow-x: auto;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.doc-content th,
.doc-content td {
  min-width: 110px;
  padding: 11px 13px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.doc-content th {
  background: color-mix(in srgb, var(--paper) 78%, var(--acid-soft));
  color: var(--ink);
  font-weight: 680;
}

.doc-content tr:last-child td {
  border-bottom: 0;
}

.doc-content th:last-child,
.doc-content td:last-child {
  border-right: 0;
}

.doc-content a {
  color: var(--ink);
  text-decoration-line: underline;
  text-decoration-color: color-mix(in srgb, var(--acid) 82%, var(--ink));
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: background 0.16s ease, text-decoration-color 0.16s ease;
}

.doc-content a:hover {
  background: var(--acid-soft);
  text-decoration-color: var(--ink);
}

/*
  Relative links, root paths and anchors are internal and stay unmarked.
  Absolute links back to ishya.top are internal too. The enhanced archive-link
  catalog owns its own arrow, and image links are excluded.
*/
.doc-content a:is(
  [href^="http://"],
  [href^="https://"],
  [href^="//"]
):not([href*="//archive.ishya.top/"]):not(:has(img))::after {
  content: "↗";
  display: inline-block;
  margin-left: 0.2em;
  color: var(--acid);
  font-size: 0.72em;
  font-weight: 750;
  line-height: 1;
  text-decoration: none;
  transform: translateY(-0.16em);
  transition: transform 0.16s ease;
}

.doc-content a:is(
  [href^="http://"],
  [href^="https://"],
  [href^="//"]
):not([href*="//archive.ishya.top/"]):not(:has(img)):hover::after {
  transform: translate(0.12em, -0.28em);
}

.doc-content .archive-links a::after {
  content: none;
}

/* Native disclosure blocks rendered as archive-note cards. */
.doc-content details {
  margin: 2.15em 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--surface) 68%, transparent);
  transition:
    border-color 0.18s ease,
    background-color 0.18s ease,
    box-shadow 0.18s ease;
}

.doc-content details:hover,
.doc-content details:focus-within,
.doc-content details[open] {
  border-color: var(--line-strong);
  background: var(--surface);
}

.doc-content details[open] {
  padding-bottom: 20px;
  box-shadow: 0 18px 44px rgb(17 16 40 / 0.055);
}

:root[data-theme="dark"] .doc-content details[open] {
  box-shadow: none;
}

.doc-content details > summary {
  display: grid;
  grid-template-columns: 7px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 14px;
  min-height: 58px;
  padding: 13px 17px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 690;
  line-height: 1.55;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color 0.16s ease, background-color 0.16s ease;
}

.doc-content details > summary::-webkit-details-marker {
  display: none;
}

.doc-content details > summary::before {
  content: "";
  width: 6px;
  height: 6px;
  border: 1px solid var(--acid);
  background: color-mix(in srgb, var(--acid) 5%, transparent);
  transform: rotate(45deg);
  transition: border-color 0.16s ease, background-color 0.16s ease;
}

.doc-content details > summary::after {
  content: "";
  width: 22px;
  height: 22px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--muted);
  background:
    linear-gradient(currentColor, currentColor) center / 9px 1px no-repeat,
    linear-gradient(currentColor, currentColor) center / 1px 9px no-repeat;
  transition: color 0.16s ease, border-color 0.16s ease, transform 0.2s ease;
}

.doc-content details > summary:hover {
  color: color-mix(in srgb, var(--ink) 74%, var(--acid));
  background: color-mix(in srgb, var(--acid) 7%, transparent);
}

.doc-content details > summary:hover::after {
  border-color: color-mix(in srgb, var(--acid) 52%, var(--line));
  color: var(--acid);
  transform: rotate(90deg);
}

.doc-content details > summary:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--acid) 42%, transparent);
  outline-offset: -4px;
}

.doc-content details[open] > summary {
  border-bottom: 1px solid var(--line);
  color: color-mix(in srgb, var(--ink) 72%, var(--acid));
}

.doc-content details[open] > summary::before {
  border-color: var(--acid);
  background: var(--acid);
}

.doc-content details[open] > summary::after {
  border-color: color-mix(in srgb, var(--acid) 52%, var(--line));
  color: var(--acid);
  background: linear-gradient(currentColor, currentColor) center / 9px 1px no-repeat;
  transform: rotate(180deg);
}

.doc-content details > summary ~ * {
  margin-right: 20px;
  margin-left: 20px;
}

.doc-content details > summary + * {
  margin-top: 20px;
}

.doc-content details > :last-child {
  margin-bottom: 0;
}

.doc-content details > summary :is(h4, h5, h6) {
  margin: 0;
  padding: 0;
  border: 0;
  color: inherit;
  font: inherit;
  letter-spacing: inherit;
}

.doc-content details > summary :is(h4, h5)::before {
  display: none;
}

.doc-pagination {
  width: min(900px, 100%);
  margin: 18px auto 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.doc-pagination a {
  min-width: 0;
  padding: 17px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  font-size: 13px;
}

.doc-pagination a span {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.doc-pagination a:hover {
  border-color: var(--ink);
  background: color-mix(in srgb, var(--ink) 4%, transparent);
}

.doc-pagination i {
  flex: 0 0 auto;
  margin-left: 14px;
  color: var(--faint);
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
}

.doc-foot {
  width: min(900px, 100%);
  margin: 0 auto;
  padding-top: 18px;
  color: var(--faint);
  font: 500 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

/* Book-like archive rendered from nested Markdown links */
.archive-links {
  position: relative;
  max-width: 720px;
  margin-top: 1.7em;
  padding: 2px 0 6px 12px;
  border-left: 3px solid var(--muted);
}

.archive-links::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 12px;
  left: -3px;
  width: 3px;
  background: linear-gradient(to bottom, var(--acid) 0 72px, transparent 72px);
}

.archive-links-head {
  margin-bottom: 12px;
  padding: 0 0 4px;
  border-bottom: 1px solid var(--ink);
}

.archive-links-head > span {
  color: var(--faint);
  font: 600 9px/1.3 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.archive-links-head:has(.archive-links-title) {
  padding-bottom: 6px;
}

.doc-content .archive-links-head > .archive-links-title {
  margin: 2px 0 0 2px;
  padding: 0;
  border: 0;
  color: var(--ink);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 730;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.doc-content .archive-links-head > .archive-links-title::before {
  display: none;
}

.archive-link-list,
.archive-link-children {
  margin: 0;
  padding: 0;
  list-style: none;
}

.archive-link-children {
  position: relative;
  margin: 0 0 0 32px;
  border-top: 0;
}

.archive-link-children::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 0;
  width: 1px;
  background: color-mix(in srgb, var(--line-strong) 55%, transparent);
}

.archive-link-row {
  min-height: 35px;
  padding: 0 4px 0 min(calc(var(--archive-depth) * 13px), 78px);
  display: grid;
  grid-template-columns: 32px 13px minmax(100px, auto) minmax(18px, 1fr) auto;
  align-items: center;
  gap: 0;
  border-radius: 0;
  transition: background 0.16s ease;
}

.archive-link-row:hover {
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--acid) 6%, transparent),
    transparent 72%
  );
}

.archive-link-number {
  color: var(--faint);
  margin-top: 2px;
  font: 520 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.archive-link-toggle,
.archive-link-toggle-spacer {
  width: 20px;
  height: 30px;
  display: grid;
  place-items: center;
}

.archive-link-item.is-leaf > .archive-link-row > .archive-link-toggle-spacer {
  display: none;
}

.archive-link-item.is-leaf > .archive-link-row > .archive-link-main {
  grid-column: 2 / 4;
}

.archive-link-item.is-leaf > .archive-link-row > .archive-link-leader {
  grid-column: 4;
}

.archive-link-item.is-leaf > .archive-link-row > .archive-link-side {
  grid-column: 5;
}

.archive-link-toggle {
  padding: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--faint);
  cursor: pointer;
}

.archive-link-toggle:hover {
  color: var(--ink);
  background: color-mix(in srgb, var(--ink) 5%, transparent);
}

.archive-link-toggle span {
  display: block;
  font-size: 16px;
  line-height: 1;
  transition: transform 0.18s ease;
}

.archive-link-toggle[aria-expanded="true"] span {
  transform: rotate(90deg);
}

.archive-link-main {
  min-width: 0;
  padding: 0 10px 0 5px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
}

.archive-link-title {
  max-width: 100%;
  overflow: hidden;
  color: var(--ink);
  font-size: 13px;
  font-weight: 620;
  line-height: 1.35;
  white-space: nowrap;
  text-decoration: none;
  text-overflow: ellipsis;
}

.archive-link-title:is(a) {
  text-decoration: none;
}

.archive-link-title:is(a):hover {
  background: transparent;
  text-decoration-line: underline;
  text-decoration-color: var(--acid);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.archive-folder-label {
  max-width: 100%;
  padding: 0;
  overflow: hidden;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.archive-link-description {
  max-width: 100%;
  overflow: hidden;
  color: var(--faint);
  font-size: 9px;
  line-height: 1.4;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.doc-content .archive-link-description code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
}

.archive-link-leader {
  min-width: 18px;
  height: 1px;
  margin: 0 11px;
  align-self: center;
  border-bottom: 1px dotted color-mix(in srgb, var(--faint) 72%, transparent);
  transform: translateY(2px);
  transition: border-color 0.16s ease;
}

.archive-link-row:hover .archive-link-leader {
  border-color: color-mix(in srgb, var(--ink) 55%, transparent);
}

.archive-link-side {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 9px;
  color: var(--faint);
  font: 520 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  white-space: nowrap;
}

.archive-link-side i {
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
  transition: color 0.16s ease, transform 0.16s ease;
}

.archive-link-item.is-link > .archive-link-row:hover .archive-link-side i {
  color: var(--ink);
  transform: translate(1px, -1px);
}

.archive-link-list > .archive-link-item > .archive-link-row {
  min-height: 35px;
}

.archive-link-list > .archive-link-item > .archive-link-row .archive-link-title {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.archive-link-item.is-folder > .archive-link-row .archive-link-title {
  color: var(--muted);
}


.tree-panel::-webkit-scrollbar,
.document-preview::-webkit-scrollbar,
.outline-panel::-webkit-scrollbar {
  width: 8px;
}

.tree-panel::-webkit-scrollbar-thumb,
.document-preview::-webkit-scrollbar-thumb,
.outline-panel::-webkit-scrollbar-thumb {
  border: 2px solid transparent;
  border-radius: 999px;
  background: color-mix(in srgb, var(--muted) 50%, transparent);
  background-clip: padding-box;
}

@keyframes doc-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 64px;
  }

  .section-wrap {
    width: min(calc(100% - 38px), 650px);
  }

  .topbar {
    padding: 0 19px;
    grid-template-columns: 1fr auto;
  }

  .nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    height: auto;
    padding: 12px 19px 20px;
    display: none;
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--line-strong);
    background: var(--paper);
  }

  .nav.nav-open {
    display: flex;
  }

  .nav a {
    padding: 15px 0;
    border-bottom: 1px solid var(--line);
    text-align: left;
  }

  .header-actions {
    gap: 7px;
  }

  .menu-toggle {
    display: block;
  }

  .home-main {
    min-height: auto;
  }

  .intro {
    padding: 45px 0 70px;
  }

  .intro-grid {
    padding-top: 34px;
    grid-template-columns: 1fr;
    gap: 54px;
  }

  .intro-copy h1 {
    font-size: clamp(48px, 15vw, 72px);
  }

  .lead {
    font-size: 15px;
  }

  .recent-line {
    flex-wrap: wrap;
    row-gap: 6px;
  }

  .recent-line strong {
    flex-basis: calc(100% - 13px);
  }

  .footer {
    min-height: 130px;
    padding-block: 35px;
    flex-wrap: wrap;
    gap: 12px;
  }

  .footer span:nth-child(2) {
    display: none;
  }

  .site-shell.doc-mode {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .collection-workspace {
    height: auto;
    min-height: calc(100vh - var(--header-height));
    overflow: visible;
    display: block;
  }

  .mobile-docbar {
    position: sticky;
    top: var(--header-height);
    z-index: 70;
    height: 45px;
    padding: 0 17px;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    align-items: center;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--paper) 94%, transparent);
    backdrop-filter: blur(12px);
  }

  .mobile-docbar.has-page-outline {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .tree-mobile-trigger {
    width: 100%;
    padding: 0;
    display: grid;
    grid-template-columns: 17px auto 1fr;
    align-items: center;
    gap: 8px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    text-align: left;
    font-size: 11px;
  }

  .tree-mobile-trigger strong {
    justify-self: end;
    color: var(--faint);
    font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
    letter-spacing: 0.08em;
  }

  .outline-mobile-trigger {
    height: 27px;
    margin-left: 13px;
    padding: 0 0 0 13px;
    display: grid;
    grid-template-columns: 16px auto auto;
    align-items: center;
    gap: 7px;
    border-left: 1px solid var(--line-strong);
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 11px;
  }

  .outline-mobile-trigger strong {
    min-width: 22px;
    height: 18px;
    display: grid;
    place-items: center;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    color: var(--faint);
    font: 600 8px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  }

  .outline-mobile-icon {
    position: relative;
    width: 14px;
    height: 10px;
    border-top: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
  }

  .outline-mobile-icon::after {
    content: "";
    position: absolute;
    top: 4px;
    left: 4px;
    width: 10px;
    height: 1px;
    background: currentColor;
  }

  .tree-mobile-icon {
    position: relative;
    width: 14px;
    height: 11px;
    border: 1px solid currentColor;
    border-radius: 2px;
  }

  .tree-mobile-icon::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 6px;
    height: 1px;
    background: currentColor;
    box-shadow: 0 3px 0 currentColor;
  }

  .tree-scrim {
    position: fixed;
    inset: 0;
    z-index: 150;
    display: block;
    width: 100%;
    height: 100%;
    padding: 0;
    background: rgb(8 12 9 / 0.42);
    opacity: 0;
    cursor: default;
    transition: opacity 0.22s ease;
    backdrop-filter: blur(2px);
  }

  .tree-scrim.is-visible {
    opacity: 1;
  }

  .tree-panel {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 160;
    width: min(86vw, 348px);
    max-height: none;
    padding: 19px 13px 34px;
    border-right: 1px solid var(--line-strong);
    box-shadow: 18px 0 50px rgb(0 0 0 / 0.16);
    transform: translateX(-104%);
    transition: transform 0.22s ease;
  }

  .tree-panel.is-open {
    transform: translateX(0);
  }

  .tree-mobile-close {
    width: 30px;
    height: 30px;
    margin: -6px -2px 6px 0;
    display: grid;
    place-items: center;
    border-radius: 6px;
    background: transparent;
    color: var(--muted);
    cursor: pointer;
    font-size: 21px;
  }

  .tree-mobile-close:hover {
    background: color-mix(in srgb, var(--ink) 6%, transparent);
    color: var(--ink);
  }

  .outline-panel {
    width: min(86vw, 348px);
    padding-top: 22px;
  }

  .document-preview {
    min-height: 590px;
    padding: 18px 18px 34px;
    overflow: visible;
  }

  .document-entry-row {
    margin-bottom: 10px;
  }

  .outline-trigger {
    display: none;
  }

  .doc-body {
    padding: 28px 6px 62px;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .document-preview h1 {
    font-size: clamp(34px, 10vw, 43px);
  }
}

@media (max-width: 640px) {
  .accent-picker {
    width: 26px;
    height: 26px;
  }

  .doc-lead {
    padding: 17px 16px 16px 21px;
    font-size: 14px !important;
    line-height: 1.75 !important;
  }

  .doc-lead::before {
    margin-bottom: 8px;
  }

  .doc-pagination {
    gap: 7px;
  }

  .doc-pagination a {
    min-height: 58px;
    padding: 13px 12px;
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    font-size: 11px;
  }

  .doc-pagination-next {
    text-align: right;
  }

  .doc-pagination-next span,
  .doc-pagination-next i {
    align-self: flex-end;
  }

  .doc-pagination i {
    margin-left: 0;
  }

  .tree-mobile-trigger strong {
    display: none;
  }

  .doc-content h2[data-outline-heading] {
    font-size: 22px;
  }

  .doc-content h4[data-outline-heading] {
    margin-top: 2.25em;
    padding-left: 18px;
    font-size: 15px;
  }

  .doc-content h5 {
    padding-left: 27px;
    font-size: 12px;
  }

  .doc-content details {
    margin-block: 1.8em;
    border-radius: 10px;
  }

  .doc-content details > summary {
    grid-template-columns: 6px minmax(0, 1fr) 22px;
    gap: 11px;
    min-height: 54px;
    padding: 12px 14px;
    font-size: 14px;
  }

  .doc-content details > summary ~ * {
    margin-right: 16px;
    margin-left: 16px;
  }

  .doc-content .heading-anchor {
    opacity: 0.7;
  }

  .intro-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 19px;
  }

  .about-note {
    padding: 24px;
  }

  .archive-links {
    padding-left: 15px;
  }

  .archive-links-head {
    grid-template-columns: 1fr;
    gap: 9px;
  }

  .archive-links-head > span {
    padding-top: 0;
  }

  .archive-link-children {
    margin-left: 22px;
  }

  .archive-link-leader {
    display: none;
  }

  .archive-link-main {
    padding-inline: 4px 8px;
  }

  .archive-link-description {
    white-space: normal;
  }

  .archive-link-item.is-link > .archive-link-row .archive-link-side > span {
    display: none;
  }

  .archive-link-item.is-leaf > .archive-link-row > .archive-link-side {
    grid-column: 4;
  }

  .archive-link-side {
    min-width: 19px;
  }
}

@media (min-width: 1680px) {
  .collection-workspace.has-outline {
    grid-template-columns: var(--tree-width) minmax(0, 1fr) 224px;
  }

  .collection-workspace.has-outline .document-preview {
    grid-column: 2;
    grid-row: 1;
  }

  .collection-workspace.has-outline .outline-panel {
    position: relative;
    inset: auto;
    z-index: 1;
    grid-column: 3;
    grid-row: 1;
    width: auto;
    height: auto;
    padding: 24px 15px 36px;
    border-left: 1px solid var(--line);
    background: var(--sidebar);
    box-shadow: none;
    transform: none;
    backdrop-filter: none;
  }

  .collection-workspace.has-outline .outline-panel-head {
    margin-inline: 2px;
  }

  .collection-workspace.has-outline .outline-close,
  .collection-workspace.has-outline .outline-trigger {
    display: none;
  }

  .collection-workspace.has-outline .outline-link {
    padding-right: 4px;
    padding-left: calc(3px + var(--outline-depth) * 11px);
    grid-template-columns: 10px minmax(0, 1fr);
    gap: 6px;
    font-size: 11px;
  }

  .collection-workspace.has-outline .outline-link > small {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}

/* Global ultra-thin scrollbar */
* {
  scrollbar-width: none;
}