/* ── Reset & Variables ─────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-w: 268px;
  --bg:        #ffffff;
  --bg-alt:    #f8f9fb;
  --border:    #e4e7ed;
  --text:      #1a1c2e;
  --muted:     #6b7280;
  --accent:    #6366f1;
  --accent-lt: #eef2ff;
  --code-bg:   #f1f3f9;
  --code-text: #2d3262;
  --note-bg:   #eff6ff;
  --note-bd:   #3b82f6;
  --tip-bg:    #f0fdf4;
  --tip-bd:    #22c55e;
  --warn-bg:   #fffbeb;
  --warn-bd:   #f59e0b;
  --danger-bg: #fff1f2;
  --danger-bd: #f43f5e;
  --sidebar-bg:#f8f9fb;
  --font:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono:      "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;
}

/* ── Layout ────────────────────────────────────────────────────────────────── */
html, body { height: 100%; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  display: flex;
}

/* Sidebar */
#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100vh;
  position: sticky;
  top: 0;
  overflow-y: auto;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 24px 0 40px;
  flex-shrink: 0;
}

.sidebar-logo {
  padding: 0 20px 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}
.sidebar-logo a {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -.2px;
}
.sidebar-logo .version {
  display: inline-block;
  margin-top: 4px;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-lt);
  padding: 2px 8px;
  border-radius: 20px;
}

/* Hamburger toggle — hidden on desktop, shown on mobile via the media query */
.sidebar-toggle { display: none; }

.nav-group { padding: 0 12px 8px; }
.nav-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 10px 8px 4px;
}
.nav-group a {
  display: block;
  font-size: 14px;
  color: #374151;
  text-decoration: none;
  padding: 6px 8px;
  border-radius: 6px;
  transition: background .12s, color .12s;
}
.nav-group a:hover { background: var(--border); color: var(--text); }
.nav-group a.active {
  background: var(--accent-lt);
  color: var(--accent);
  font-weight: 600;
}

/* Main */
main {
  flex: 1;
  min-width: 0;
  padding: 56px 72px 100px;
  max-width: 860px;
}

/* ── Page header ───────────────────────────────────────────────────────────── */
.breadcrumb {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
h1 { font-size: 2.1rem; font-weight: 800; line-height: 1.2; margin-bottom: 12px; }
.lead { font-size: 1.1rem; color: var(--muted); margin-bottom: 40px; border-bottom: 1px solid var(--border); padding-bottom: 28px; }

/* ── Typography ────────────────────────────────────────────────────────────── */
h2 { font-size: 1.45rem; font-weight: 700; margin: 48px 0 12px; }
h3 { font-size: 1.1rem; font-weight: 700; margin: 28px 0 8px; }
h4 { font-size: .95rem; font-weight: 700; margin: 20px 0 6px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
p  { margin-bottom: 16px; }
ul, ol { padding-left: 22px; margin-bottom: 16px; }
li { margin-bottom: 6px; }
a  { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { font-weight: 700; }

/* ── Code ──────────────────────────────────────────────────────────────────── */
code {
  font-family: var(--mono);
  font-size: .875em;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 2px 6px;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  overflow-x: auto;
  margin-bottom: 24px;
}
pre code {
  background: none;
  padding: 0;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--code-text);
}

/* ── Callouts ──────────────────────────────────────────────────────────────── */
.callout {
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 20px;
  border-left: 4px solid;
  display: flex;
  gap: 12px;
}
.callout-icon { font-size: 18px; flex-shrink: 0; line-height: 1.7; }
.callout-body p:last-child { margin-bottom: 0; }
.callout.note   { background: var(--note-bg);   border-color: var(--note-bd); }
.callout.tip    { background: var(--tip-bg);    border-color: var(--tip-bd); }
.callout.warn   { background: var(--warn-bg);   border-color: var(--warn-bd); }
.callout.danger { background: var(--danger-bg); border-color: var(--danger-bd); }

/* ── Steps ─────────────────────────────────────────────────────────────────── */
.steps { counter-reset: step; list-style: none; padding-left: 0; }
.steps li {
  counter-increment: step;
  padding-left: 48px;
  position: relative;
  margin-bottom: 20px;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 30px; height: 30px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* ── Table ─────────────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; margin-bottom: 24px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); }
th { font-weight: 700; background: var(--bg-alt); }
tr:last-child td { border-bottom: none; }

/* ── Tags / Badges ─────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  vertical-align: middle;
}
.badge-green  { background: #dcfce7; color: #15803d; }
.badge-blue   { background: var(--accent-lt); color: var(--accent); }
.badge-gray   { background: #f3f4f6; color: #6b7280; }
.badge-orange { background: #fff7ed; color: #c2410c; }

/* ── On this page (TOC) ────────────────────────────────────────────────────── */
.on-this-page {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 22px;
  margin-bottom: 40px;
  font-size: 14px;
}
.on-this-page strong { display: block; margin-bottom: 8px; font-size: 12px; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); }
.on-this-page a { color: var(--text); display: block; padding: 3px 0; }
.on-this-page a:hover { color: var(--accent); text-decoration: none; }

/* ── Prev / Next navigation ────────────────────────────────────────────────── */
.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 60px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  gap: 16px;
}
.page-nav a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-decoration: none;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  flex: 1;
  max-width: 48%;
  transition: border-color .15s;
}
.page-nav a:hover { border-color: var(--accent); text-decoration: none; }
.page-nav .nav-dir { font-size: 12px; color: var(--muted); font-weight: 600; }
.page-nav .nav-title { font-size: 15px; font-weight: 700; color: var(--text); }
.page-nav a.next { text-align: right; margin-left: auto; }

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  body { flex-direction: column; }
  #sidebar {
    width: 100%;
    height: auto;
    position: sticky;
    top: 0;
    z-index: 50;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 0 0 0;
  }

  /* Header row: title on the left, hamburger toggle on the right */
  .sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 20px;
  }
  .sidebar-logo { padding: 0; border-bottom: none; margin-bottom: 0; }

  .sidebar-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    font: inherit;
    color: var(--text);
    flex-shrink: 0;
  }
  .sidebar-toggle-current {
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    max-width: 40vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  /* CSS hamburger icon */
  .sidebar-toggle-icon {
    position: relative;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: background .15s;
  }
  .sidebar-toggle-icon::before,
  .sidebar-toggle-icon::after {
    content: "";
    position: absolute;
    left: 0;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform .2s;
  }
  .sidebar-toggle-icon::before { top: -6px; }
  .sidebar-toggle-icon::after  { top: 6px; }
  /* Animate to an X when open */
  #sidebar.open .sidebar-toggle-icon { background: transparent; }
  #sidebar.open .sidebar-toggle-icon::before { transform: translateY(6px) rotate(45deg); }
  #sidebar.open .sidebar-toggle-icon::after  { transform: translateY(-6px) rotate(-45deg); }

  /* Collapsed nav by default; revealed when #sidebar.open */
  .sidebar-nav {
    display: none;
    max-height: 70vh;
    overflow-y: auto;
    padding: 8px 0 20px;
    border-top: 1px solid var(--border);
  }
  #sidebar.open .sidebar-nav { display: block; }

  main { padding: 32px 20px 60px; }
}

/* Desktop: header is a simple stacked block, nav always visible */
@media (min-width: 769px) {
  .sidebar-nav { display: block; }
}