:root {
  --bg: #f4f6f8;
  --bg-elev: #eef2f5;
  --panel: #ffffff;
  --panel-soft: #f9fbfc;
  --text: #1f2730;
  --muted: #667788;
  --accent: #2f7f7a;
  --accent-soft: rgba(47, 127, 122, 0.12);
  --line: #d7dde5;
  --line-strong: #bcc7d3;
  --code-bg: #edf3f7;
  --shadow: none;
  --reading-width: 76ch;
}

html[data-theme="dark"] {
  --bg: #1a2028;
  --bg-elev: #1f2630;
  --panel: #232b36;
  --panel-soft: #1f2731;
  --text: #dde5ef;
  --muted: #9ba8b8;
  --accent: #5ab3ab;
  --accent-soft: rgba(90, 179, 171, 0.16);
  --line: #344050;
  --line-strong: #465568;
  --code-bg: #2a3442;
  --shadow: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  color: var(--text);
  padding: 0.1rem 0.32rem;
  border-radius: 0.28rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto minmax(200px, 360px) minmax(240px, 1fr) minmax(280px, 420px);
  gap: 0.8rem;
  align-items: center;
  padding: 0.75rem 0.95rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel-soft);
}

.topbar h1 {
  margin: 0;
  font-size: 0.98rem;
  letter-spacing: 0.07em;
}

.subtitle {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.35;
}

.menu-btn,
.theme-btn,
.addr-jump button {
  height: 2.15rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.45rem;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

.menu-btn {
  width: 2.2rem;
  font-size: 1rem;
}

.topbar-main {
  min-width: 0;
}

.search-wrap {
  position: relative;
}

#site-search {
  width: 100%;
  height: 2.2rem;
  border-radius: 0.45rem;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: var(--text);
  padding: 0 0.75rem;
  font-size: 0.88rem;
}

.topbar-actions {
  display: flex;
  gap: 0.55rem;
  align-items: center;
  justify-content: flex-end;
}

.addr-jump {
  display: grid;
  grid-template-columns: minmax(130px, 1fr) auto;
  gap: 0.45rem;
  width: min(100%, 290px);
}

#addr-jump {
  height: 2.15rem;
  border-radius: 0.45rem;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: var(--text);
  padding: 0 0.62rem;
  font-size: 0.83rem;
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

#addr-jump.invalid {
  border-color: #c45d5d;
}

.theme-btn {
  width: 4.25rem;
  font-size: 0.83rem;
}

.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 0.28rem);
  left: 0;
  right: 0;
  max-height: 55vh;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: 0.45rem;
  background: var(--panel);
}

.search-results.open {
  display: block;
}

.search-item {
  display: block;
  padding: 0.58rem 0.72rem;
  border-bottom: 1px solid var(--line);
}

.search-item:last-child {
  border-bottom: 0;
}

.search-item .kind {
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.search-item .title {
  display: block;
  color: var(--text);
  margin-top: 0.16rem;
  font-size: 0.84rem;
}

.search-item .excerpt {
  color: var(--muted);
  font-size: 0.8rem;
  margin-top: 0.2rem;
  line-height: 1.36;
}

.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: calc(100vh - 72px);
}

.sidebar {
  border-right: 1px solid var(--line);
  background: var(--panel-soft);
  padding: 0.8rem 0.7rem 1.2rem;
  overflow: auto;
}

.home-link {
  display: block;
  padding: 0.52rem 0.6rem;
  margin-bottom: 0.52rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.42rem;
  color: var(--text);
  font-weight: 600;
}

.nav-part {
  margin-bottom: 0.52rem;
  border: 1px solid var(--line);
  border-radius: 0.42rem;
  background: var(--panel);
}

.nav-part summary {
  list-style: none;
  padding: 0.52rem 0.6rem;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
}

.nav-part summary::-webkit-details-marker {
  display: none;
}

.nav-part summary a {
  color: var(--text);
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.8rem;
}

.nav-section-list {
  list-style: none;
  margin: 0;
  padding: 0.24rem;
}

.sec-link {
  display: block;
  padding: 0.3rem 0.45rem;
  border-radius: 0.32rem;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.35;
}

.sec-link.ready {
  color: var(--text);
}

.sec-link.active,
.sec-link:hover {
  color: var(--text);
  background: var(--accent-soft);
}

.content {
  padding: 1rem;
}

.reader-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 1rem;
  align-items: start;
}

.reader-main {
  min-width: 0;
  max-width: 1100px;
}

.info-panel {
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: var(--panel);
  padding: 0.7rem;
  position: sticky;
  top: 84px;
}

.panel-section + .panel-section {
  border-top: 1px solid var(--line);
  margin-top: 0.7rem;
  padding-top: 0.7rem;
}

.panel-title {
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

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

.panel-list li {
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
}

.crumbs {
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 0.75rem;
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.sep {
  color: var(--line-strong);
}

.hero,
.card {
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 0.85rem 0.95rem;
  margin-bottom: 0.8rem;
}

.card.warn {
  border-color: #b8a87e;
  background: var(--panel-soft);
}

.node-kind {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.38rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--accent-soft);
  color: var(--text);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.45rem;
}

.hero h2,
.card h2,
.card h3 {
  margin-top: 0;
}

.cards.two {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.card.big h3 {
  margin-bottom: 0.35rem;
}

.card.accent {
  border-color: var(--line-strong);
}

.badge {
  margin-left: 0.45rem;
  padding: 0.08rem 0.36rem;
  border-radius: 0.35rem;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.7rem;
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

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

.link-list li,
.toc-list li {
  margin-bottom: 0.4rem;
}

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

.prose {
  font-family: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.78;
  font-size: clamp(1rem, 0.95rem + 0.28vw, 1.1rem);
  max-width: var(--reading-width);
  text-wrap: pretty;
}

.prose p,
.prose li,
.prose blockquote {
  color: var(--text);
}

.prose p {
  margin: 0 0 1.05rem;
}

.prose ul,
.prose ol {
  padding-left: 1.2rem;
  margin: 0.55rem 0 1.05rem;
}

.prose li {
  margin-bottom: 0.44rem;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  line-height: 1.34;
  color: var(--text);
  letter-spacing: 0.01em;
}

.prose h1 {
  font-size: clamp(1.62rem, 1.46rem + 0.6vw, 2.05rem);
  margin: 0.2rem 0 1rem;
}

.prose h2 {
  font-size: clamp(1.35rem, 1.25rem + 0.36vw, 1.66rem);
  margin: 1.6rem 0 0.82rem;
}

.prose h3 {
  font-size: clamp(1.16rem, 1.1rem + 0.25vw, 1.35rem);
  margin: 1.38rem 0 0.7rem;
}

.prose h4 {
  font-size: 1.05rem;
  margin: 1.2rem 0 0.55rem;
}

.prose pre {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 0.42rem;
  padding: 0.7rem;
  background: var(--panel-soft);
}

.prose pre code {
  background: transparent;
  padding: 0;
}

.prose blockquote {
  margin: 0.9rem 0;
  padding: 0.52rem 0.72rem;
  border-left: 2px solid var(--line-strong);
  background: var(--panel-soft);
}

.pager {
  display: flex;
  flex-wrap: wrap;
  gap: 0.52rem;
  margin: 0.8rem 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4rem 0.66rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.42rem;
  background: var(--panel);
  color: var(--text);
}

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

.footer {
  color: var(--muted);
  font-size: 0.75rem;
  margin-top: 1.1rem;
}

@media (max-width: 1320px) {
  .reader-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .info-panel {
    position: static;
    order: -1;
  }
}

@media (max-width: 1120px) {
  .topbar {
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas:
      "menu main"
      "search search"
      "actions actions";
  }

  .menu-btn {
    grid-area: menu;
  }

  .topbar-main {
    grid-area: main;
  }

  .search-wrap {
    grid-area: search;
  }

  .topbar-actions {
    grid-area: actions;
    justify-content: flex-start;
  }

  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(320px, 86vw);
    transform: translateX(-105%);
    transition: transform 0.2s ease-out;
    z-index: 50;
    border-right: 1px solid var(--line);
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  .content {
    padding: 0.82rem;
  }

  .cards.two {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .addr-jump {
    width: 100%;
  }

  .topbar-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .theme-btn {
    width: 100%;
  }

  .subtitle {
    font-size: 0.7rem;
    line-height: 1.28;
  }

  .card,
  .hero {
    padding: 0.78rem 0.82rem;
  }

  .prose {
    line-height: 1.82;
    font-size: 1.03rem;
    max-width: 100%;
  }

  .prose p {
    margin-bottom: 1.12rem;
  }
}