:root {
  --paper: #f2e6c7;
  --paper-dark: #e6d8b4;
  --ink: #1f1a12;
  --ink-soft: #4a3f2d;
  --accent: #7d3d12;
  --frame: #4a2b12;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background:
    linear-gradient(rgba(255, 255, 255, 0.14), rgba(0, 0, 0, 0.04)),
    repeating-linear-gradient(
      0deg,
      rgba(0, 0, 0, 0.02),
      rgba(0, 0, 0, 0.02) 1px,
      transparent 1px,
      transparent 4px
    ),
    var(--paper);
  color: var(--ink);
  font-family: "Courier New", Courier, monospace;
  line-height: 1.6;
}

.manual-shell {
  width: min(980px, calc(100% - 2rem));
  margin: 1.25rem auto 2.5rem;
  border: 2px solid var(--frame);
  background: var(--paper-dark);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
}

.manual-topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--frame);
  background: #d9c8a2;
}

.manual-topbar__title {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.manual-actions {
  display: flex;
  gap: 0.5rem;
}

.manual-btn {
  border: 1px solid var(--frame);
  background: #f8f1df;
  color: var(--ink);
  padding: 0.4rem 0.65rem;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}

.manual-btn:hover,
.manual-btn:focus-visible {
  background: #fff8e8;
}

.manual-content {
  padding: 1.25rem;
  overflow-wrap: break-word;
  font-size: 1.02rem;
}

.manual-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
}

.manual-toc {
  border-right: 2px solid var(--frame);
  padding: 1.1rem 0.9rem 1.25rem;
  background: #ddcca7;
  position: sticky;
  top: 0;
  max-height: calc(100vh - 2rem);
  overflow: auto;
}

.manual-toc__title {
  margin: 0 0 0.8rem;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.manual-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.4rem;
}

.manual-toc__list a {
  display: block;
  padding: 0.28rem 0.15rem;
  color: #3b2f1a;
  text-decoration: none;
  border-bottom: 1px dotted rgba(74, 43, 18, 0.35);
  border-left: 3px solid transparent;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.manual-toc__list a:hover,
.manual-toc__list a:focus-visible {
  color: #7d3d12;
}

.manual-toc__list a.is-active {
  color: #7d3d12;
  border-left-color: #7d3d12;
  background: rgba(255, 248, 230, 0.7);
}

.manual-content h1,
.manual-content h2,
.manual-content h3 {
  color: var(--accent);
  line-height: 1.3;
}

.manual-content h1 {
  margin: 0 0 0.85rem;
  border-bottom: 2px double var(--frame);
  padding-bottom: 0.35rem;
}

.manual-content h2 {
  margin-top: 1.7rem;
  margin-bottom: 0.65rem;
  border-top: 1px dashed #8f7b56;
  padding-top: 0.8rem;
  scroll-margin-top: 0.8rem;
}

.manual-content h3 {
  margin-top: 1.1rem;
  margin-bottom: 0.45rem;
}

.manual-content p,
.manual-content li {
  color: var(--ink-soft);
}

.manual-content a {
  color: #214f8f;
}

.manual-content pre {
  padding: 0.95rem 1rem;
  border: 1px solid #927d56;
  background: #e7d9b6;
  overflow: auto;
  border-radius: 4px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.28);
}

.manual-content code {
  font-family: "Courier New", Courier, monospace;
  background: rgba(0, 0, 0, 0.06);
  padding: 0.05rem 0.2rem;
}

.manual-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.2rem;
  display: block;
  overflow-x: auto;
  white-space: nowrap;
}

.manual-content th,
.manual-content td {
  border: 1px solid #927d56;
  padding: 0.45rem 0.5rem;
  text-align: left;
  vertical-align: top;
}

.manual-content th {
  background: #ddc99e;
  position: sticky;
  top: 0;
  z-index: 1;
}

.manual-content blockquote {
  margin: 1rem 0;
  padding: 0.6rem 0.8rem;
  border-left: 4px solid #8f6f38;
  background: rgba(0, 0, 0, 0.04);
}

@media (max-width: 960px) {
  .manual-layout {
    grid-template-columns: 1fr;
  }

  .manual-toc {
    position: static;
    max-height: none;
    overflow: visible;
    border-right: 0;
    border-bottom: 2px solid var(--frame);
  }
}

@media print {
  body {
    background: #fff;
  }

  .manual-shell {
    width: 100%;
    margin: 0;
    border: 0;
    box-shadow: none;
    background: #fff;
  }

  .manual-topbar {
    display: none;
  }

  .manual-toc {
    display: none;
  }

  .manual-content {
    padding: 0;
    font-size: 11pt;
    line-height: 1.45;
  }

  .manual-content h1,
  .manual-content h2,
  .manual-content h3 {
    break-after: avoid-page;
    page-break-after: avoid;
  }

  .manual-content table,
  .manual-content pre,
  .manual-content blockquote {
    break-inside: avoid-page;
    page-break-inside: avoid;
  }
}