:root {
  --base: clamp(16px, 1.2vw + 0.25rem, 20px);
  --maxw: 120ch; /* readable line length cap */
  --bg: #000; /* page background */
  --fg: #e8e8e8; /* body text */
  --accent: #8ab4f8; /* links / focus ring */
  --panel: #383635; /* sidebar / buttons */
  --panel-2: #4f4a4a; /* borders / hovers */
  --code-bg: #111; /* code blocks */
  --topbar-h: 60px;
  --sidebar-top-gap: 8px;
  --sidebar-bottom-gap: 8px;
  --sidebar-radius: 10px;
  --sidebar-w: 0px; /* default: closed; checkbox toggles this */
}

:root:has(#nav-toggle:checked) {
  --sidebar-w: 250px;
}

/* Don’t push content on mobile (overlay the sidebar) */
@media (max-width: 900px) {
  :root:has(#nav-toggle:checked) {
    --sidebar-w: 0px;
  }
}

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

/* Stop scroll-jump when the label focuses the hidden checkbox */
#nav-toggle {
  position: fixed;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  opacity: 0;
}

html {
  font-size: var(--base);
  color-scheme: dark;
  scroll-padding-top: calc(var(--topbar-h) + 10px);
	scrollbar-gutter: stable both-edges;
}

body {
  margin: 0;
  line-height: 1.6;
  font-family:
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Ubuntu,
    "Noto Sans",
    Arial,
    sans-serif;
  background: var(--bg);
  color: var(--fg);
}

/* <main> preferred; falls back to .main for <div class="main"> */
main,
.main {
  /* Reserve space for the open sidebar by padding */
  padding-left: var(--sidebar-w);
  transition: padding-left 0.3s ease;
  margin-top: var(--topbar-h);
  padding-inline: 1.25rem;
}

a {
  color: var(--accent);
}

table {
  border-collapse: collapse;
}

td {
  border: 1px solid #dfe2e5;
  padding: 0.5em;
}

details {
  margin-block: 1.25rem;
}
summary {
  font-size: 1.25em;
  font-weight: 700;
  cursor: pointer;
  text-wrap: balance;
}
details > summary {
  text-align: center;
  font-size: 1.25em;
  font-weight: 700;
  cursor: pointer;
  text-wrap: balance;
}

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

#nav-toggle:focus-visible + .menu-toggle {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--topbar-h);
  background: var(--panel-2);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 1rem;
  padding-left: var(--sidebar-w);
  transition: padding-left 0.3s ease;
  z-index: 1;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 2;
}

#nav-toggle:checked ~ .backdrop {
  opacity: 1;
  pointer-events: auto;
}

.sidebar {
  position: fixed;
  inset: calc(var(--topbar-h) + var(--sidebar-top-gap)) auto
    var(--sidebar-bottom-gap) 0;
  width: 250px;
  background: var(--panel);
  color: #eee;
  padding: 1rem 0 0;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  box-shadow: 2px 0 6px rgba(0, 0, 0, 0.1);
  z-index: 3; /* Above .backdrop */
  border-bottom: 1px solid var(--panel-2);
  border-radius: 0 0 var(--sidebar-radius) 0;
}

#nav-toggle:checked ~ .sidebar {
  transform: translateX(0);
}

.sidebar a,
.sidebar summary {
  display: block;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: #eee;
  font-weight: 700;
  cursor: pointer;
  border-bottom: 1px solid var(--panel-2);
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
  hyphens: auto;
}
.sidebar a:hover,
.sidebar summary:hover {
  background: var(--panel-2);
}

.menu-toggle {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 4; /* Top level */
  background: var(--panel);
  color: #eee;
  border: 0;
  padding: 0.5rem 1rem;
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.2);
}

.sidebar-close {
  display: block;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--panel-2);
  cursor: pointer;
  font-weight: 700;
  color: #eee;
}

.sidebar-close:hover {
  background: var(--panel-2);
}

/* Motion-safety */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

.pager {
  display: grid;
  grid-template:
    "label label" auto
    "prev  next"  auto / 1fr 1fr;
  gap: .75rem;
  max-width: var(--maxw);
  margin: 2rem auto;
}

.pager__label {
  grid-area: label;
  text-align: center;
  font-weight: 700;
  opacity: .85;
}

/* Links are text-based, lightly framed */
.pager__link {
  display: flex;
  flex-direction: column;
  gap: .125rem;
  padding: .5rem .75rem;
  text-decoration: none;
  color: var(--fg);
  border: 1px solid var(--panel-2);
  border-radius: 8px;
  background: transparent;
  transition: background .15s, border-color .15s, transform .05s;
}

.pager__link:hover {
  background: var(--panel-2);
  border-color: var(--accent);
}
.pager__link:active { transform: translateY(1px); }

.pager__kicker {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  opacity: .8;
}

.pager__title { font-weight: 700; }

.pager__prev { grid-area: prev; }
.pager__next { grid-area: next; text-align: right; }

/* Simple arrows */
.pager__prev::before { content: "← "; opacity: .8; }
.pager__next::after  { content: " →"; opacity: .8; }

/* Stack on small screens */
@media (max-width: 600px) {
  .pager {
    grid-template:
      "label" auto
      "prev"  auto
      "next"  auto / 1fr;
  }
  .pager__next { text-align: left; }
  .pager__next::after { content: ""; }
  .pager__next::before { content: "→ "; opacity: .8; }
}