:root {
  --paper: #f3efe6;
  --paper-strong: #efe7d8;
  --panel: rgba(255, 252, 246, 0.76);
  --line: rgba(68, 55, 38, 0.16);
  --ink: #211b16;
  --muted: #62584f;
  --accent: #8d3b2f;
  --shadow: 0 18px 60px rgba(70, 50, 26, 0.08);
  --font-display: "Fraunces", Georgia, serif;
  --font-ui: "Source Sans 3", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-ui);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.72), transparent 30%),
    linear-gradient(180deg, #f7f3eb 0%, var(--paper) 42%, #ede5d6 100%);
}

a {
  color: inherit;
}

.page-shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.site-header {
  margin-bottom: 24px;
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.site-kicker,
.panel-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-header__row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 5.6rem);
  line-height: 0.92;
  font-weight: 600;
}

.site-intro {
  max-width: 56ch;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.15rem;
  line-height: 1.55;
}

.publish-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin: 22px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line);
}

.publish-meta div {
  display: grid;
  gap: 2px;
}

.publish-meta dt {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.publish-meta dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}


.site-actions {
  flex: 0 0 auto;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
}

.download-link {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  border: 1px solid rgba(141, 59, 47, 0.22);
  border-radius: 999px;
  background: rgba(141, 59, 47, 0.08);
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  white-space: nowrap;
}

.download-link:hover,
.download-link:focus-visible {
  background: rgba(141, 59, 47, 0.14);
  outline: none;
}

.layout {
  display: grid;
  grid-template-columns: minmax(260px, 300px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.doc-list-panel,
.reader-panel {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.doc-list-panel {
  position: sticky;
  top: 18px;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 36px);
  overflow: hidden;
}

.panel-head,
.reader-meta {
  padding: 24px 24px 18px;
  border-bottom: 1px solid var(--line);
}

.panel-head--toc {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}

.panel-head h2,
.reader-meta h2 {
  margin-bottom: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1;
  font-weight: 500;
}

.toc-toggle {
  display: none;
  flex: 0 0 auto;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.45);
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.doc-list-wrap {
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.doc-list {
  display: grid;
}

.doc-link {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: start;
  width: 100%;
  padding: 18px 24px;
  border: 0;
  border-top: 1px solid var(--line);
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.doc-link:hover,
.doc-link:focus-visible {
  background: rgba(141, 59, 47, 0.05);
  outline: none;
}

.doc-link.is-active {
  background: rgba(141, 59, 47, 0.08);
}

.doc-link__index {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.doc-link__title {
  display: block;
  margin-bottom: 3px;
  font-weight: 600;
  font-size: 1.03rem;
}

.doc-link__desc {
  display: block;
  color: var(--muted);
  line-height: 1.35;
}

.markdown-body {
  padding: 30px 24px 40px;
  font-size: 1.06rem;
  line-height: 1.8;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  margin: 1.75em 0 0.55em;
  font-family: var(--font-display);
  line-height: 1.03;
  font-weight: 500;
}

.markdown-body h1 {
  font-size: 2.8rem;
}

.markdown-body h2 {
  font-size: 2rem;
}

.markdown-body h3 {
  font-size: 1.45rem;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body table,
.markdown-body pre {
  margin: 0 0 1.1em;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.4em;
}

.markdown-body li + li {
  margin-top: 0.32em;
}

.markdown-body a {
  color: var(--accent);
}

.markdown-body code {
  padding: 0.12em 0.38em;
  border-radius: 4px;
  background: rgba(34, 24, 17, 0.08);
  font-size: 0.94em;
}

.markdown-body pre {
  overflow: auto;
  padding: 16px 18px;
  background: #231f1b;
  color: #f8f4ed;
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
}

.markdown-body blockquote {
  margin-left: 0;
  padding-left: 18px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.98rem;
}

.markdown-body th,
.markdown-body td {
  padding: 12px 10px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.markdown-body th {
  background: rgba(33, 27, 22, 0.04);
}

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

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .doc-list-panel {
    position: static;
    max-height: none;
  }

  .site-header__row {
    flex-direction: column;
  }

  .site-actions {
    width: 100%;
    justify-content: flex-start;
  }

  .toc-toggle {
    display: inline-flex;
  }

  .doc-list-wrap {
    max-height: 0;
    overflow: hidden;
    transition: max-height 180ms ease;
  }

  .doc-list-panel.is-open .doc-list-wrap {
    max-height: min(58vh, 520px);
    overflow-y: auto;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 20px, 1200px);
    padding-top: 16px;
  }

  .site-header,
  .panel-head,
  .reader-meta,
  .markdown-body {
    padding-left: 18px;
    padding-right: 18px;
  }

  .doc-link {
    padding-left: 18px;
    padding-right: 18px;
    grid-template-columns: 34px 1fr;
  }

  .panel-head--toc {
    align-items: center;
  }

  .markdown-body {
    font-size: 1rem;
  }

  .markdown-body h1 {
    font-size: 2.2rem;
  }

  .markdown-body h2 {
    font-size: 1.7rem;
  }
}