@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #0a0a0a;
  --bg-card:      #111111;
  --bg-card-hover:#161616;
  --bg-code:      #0f0f0f;
  --accent:       #5b9eff;
  --accent-dim:   rgba(91,158,255,0.08);
  --text:         #f0f0f0;
  --text-sub:     #8a8a8a;
  --text-muted:   #555555;
  --border:       #1e1e1e;
  --border-bright:#2a2a2a;
  --sidebar-w:    268px;
  --nav-h:        54px;
  --green:        #4ade80;
  --red:          #f87171;
  --yellow:       #fbbf24;
  --purple:       #c792ea;
}

html { scroll-behavior: smooth; }

/* ── SCROLL OFFSET (fixed nav compensation) ── */
.doc-section, [id] {
  scroll-margin-top: calc(var(--nav-h) + 24px);
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 1.75;
  overflow-x: hidden;
}

/* ── TOP NAV ── */
.topnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(10,10,10,0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 28px; gap: 20px;
}
.topnav-brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
  font-weight: 600; font-size: 15px; letter-spacing: -0.5px;
}
.topnav-brand .sep { color: var(--border-bright); }
.topnav-brand .sub { color: var(--text-muted); font-weight: 400; font-size: 12px; }
.topnav-right {
  margin-left: auto;
  display: flex; align-items: center; gap: 22px;
}
.topnav-right a {
  font-size: 12px; color: var(--text-muted);
  text-decoration: none; letter-spacing: 0.3px;
  transition: color 0.2s;
}
.topnav-right a:hover { color: var(--text); }
.topnav-right .pubdev-link { color: var(--accent); }
.topnav-right .pubdev-link:hover { color: #88bbff; }
.topnav-ver {
  font-size: 10px; color: var(--text-muted);
  padding: 2px 8px; border: 1px solid var(--border-bright);
  border-radius: 100px; letter-spacing: 0.5px;
}

/* ── LANG TOGGLE ── */
.lang-toggle {
  background: none;
  border: 1px solid var(--border-bright);
  color: var(--text-sub);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 1px;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.lang-toggle:hover { color: var(--text); border-color: #3a3a3a; }

/* ── LAYOUT ── */
.layout {
  display: flex;
  padding-top: var(--nav-h);
  min-height: 100vh;
}

/* ── SIDEBAR ── */
.sidebar {
  position: fixed;
  top: var(--nav-h); bottom: 0; left: 0;
  width: var(--sidebar-w);
  background: var(--bg);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 24px 0 48px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-bright) transparent;
}
.sidebar::-webkit-scrollbar { width: 3px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-bright); border-radius: 2px; }

.sidebar-section { margin-bottom: 24px; }
.sidebar-section-label {
  font-size: 9px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--text-muted); padding: 0 20px; margin-bottom: 4px;
}
.sidebar-link {
  display: block; padding: 5px 20px;
  font-size: 13px; color: var(--text-sub);
  text-decoration: none; letter-spacing: -0.2px;
  transition: color 0.15s, background 0.15s;
  border-left: 2px solid transparent;
}
.sidebar-link:hover { color: var(--text); background: rgba(255,255,255,0.025); }
.sidebar-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-dim);
}
.sidebar-link.page-active { color: var(--text); font-weight: 500; }
.sidebar-link.sub { padding-left: 32px; font-size: 12px; color: var(--text-muted); }
.sidebar-link.sub:hover { color: var(--text-sub); }
.sidebar-link.sub.active { color: var(--accent); }

/* ── CONTENT ── */
.content {
  margin-left: var(--sidebar-w);
  flex: 1;
  max-width: 860px;
  padding: 52px 72px 100px;
}

/* ── SECTIONS ── */
.doc-section { margin-bottom: 80px; }

h1 {
  font-size: 30px; font-weight: 700; letter-spacing: -1.5px;
  color: var(--text); margin-bottom: 8px; line-height: 1.15;
}
h2 {
  font-size: 20px; font-weight: 600; letter-spacing: -0.5px;
  color: var(--text); margin-bottom: 16px; margin-top: 44px;
  padding-bottom: 10px; border-bottom: 1px solid var(--border);
}
h3 {
  font-size: 15px; font-weight: 600; letter-spacing: -0.2px;
  color: var(--text); margin-bottom: 10px; margin-top: 30px;
}
h4 {
  font-size: 11px; font-weight: 600; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--text-muted);
  margin-bottom: 8px; margin-top: 22px;
}

.section-intro {
  font-size: 14px; color: var(--text-sub); line-height: 1.8;
  margin-bottom: 28px; max-width: 660px;
}
p { color: var(--text-sub); margin-bottom: 14px; line-height: 1.8; }

.page-title-area { margin-bottom: 36px; }
.page-title-area .subtitle { font-size: 14px; color: var(--text-muted); }

/* ── INLINE CODE ── */
code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px; color: var(--accent);
  background: rgba(91,158,255,0.08);
  padding: 1px 5px; border-radius: 3px;
}

/* ── CODE BLOCKS ── */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
  margin: 14px 0 22px;
}
.code-block-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: #0d0d0d;
}
.code-block-label { font-size: 10px; color: var(--text-muted); letter-spacing: 1px; }
.code-block-copy {
  font-size: 10px; color: var(--text-muted);
  background: none; border: none; cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  padding: 2px 8px; border-radius: 3px;
  transition: color 0.2s, background 0.2s;
}
.code-block-copy:hover { color: var(--text); background: var(--border-bright); }
.code-block-copy.copied { color: var(--green); }
pre {
  padding: 18px 22px;
  overflow-x: auto; font-size: 13px; line-height: 1.75;
  scrollbar-width: thin; scrollbar-color: var(--border-bright) transparent;
}
pre::-webkit-scrollbar { height: 3px; }
pre::-webkit-scrollbar-thumb { background: var(--border-bright); border-radius: 2px; }
pre code { background: none; padding: 0; color: var(--text); font-size: 13px; white-space: pre; }

/* Syntax */
.kw  { color: #c792ea; }
.str { color: #c3e88d; }
.cmt { color: var(--text-muted); font-style: italic; }
.fn  { color: #82aaff; }
.num { color: #f78c6c; }
.cls { color: #ffcb6b; }
.prompt { color: var(--text-muted); user-select: none; }

/* ── CALLOUT ── */
.callout {
  border-radius: 7px; padding: 14px 18px; margin: 16px 0;
  border-left: 3px solid; font-size: 13px; line-height: 1.75;
}
.callout p { margin: 0; font-size: 13px; }
.callout-info  { background: rgba(91,158,255,0.06);  border-color: var(--accent);  }
.callout-warn  { background: rgba(251,191,36,0.06);  border-color: var(--yellow);  }
.callout-ok    { background: rgba(74,222,128,0.06);  border-color: var(--green);   }
.callout-error { background: rgba(248,113,113,0.06); border-color: var(--red);     }
.callout-label {
  font-weight: 600; display: block; margin-bottom: 4px;
  font-size: 10px; letter-spacing: 1px; text-transform: uppercase;
}
.callout-info .callout-label  { color: var(--accent); }
.callout-warn .callout-label  { color: var(--yellow); }
.callout-ok .callout-label    { color: var(--green);  }
.callout-error .callout-label { color: var(--red);    }

/* ── TABLE ── */
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 13px; }
th {
  text-align: left; padding: 9px 14px;
  font-size: 10px; letter-spacing: 1px; text-transform: uppercase;
  color: var(--text-muted); border-bottom: 1px solid var(--border);
}
td { padding: 10px 14px; border-bottom: 1px solid var(--border); color: var(--text-sub); vertical-align: top; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,255,255,0.015); }

/* ── STEPS ── */
.steps { counter-reset: step; list-style: none; margin: 18px 0; }
.steps li { counter-increment: step; display: flex; gap: 18px; margin-bottom: 24px; }
.steps li::before {
  content: counter(step);
  flex-shrink: 0; width: 26px; height: 26px;
  background: var(--accent-dim); border: 1px solid rgba(91,158,255,0.3);
  border-radius: 50%; color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600; margin-top: 1px;
}
.steps li > div { flex: 1; }
.steps li strong { color: var(--text); display: block; margin-bottom: 4px; font-size: 14px; }
.steps li p { font-size: 13px; }

/* ── RULE CARD ── */
.rule-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; padding: 16px 20px; margin: 12px 0;
}
.rule-card-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.rule-tag {
  font-size: 9px; letter-spacing: 1px; padding: 2px 8px;
  border-radius: 100px; font-weight: 600;
}
.rule-tag.err { background: rgba(248,113,113,0.12); color: var(--red); border: 1px solid rgba(248,113,113,0.2); }
.rule-tag.ok  { background: rgba(74,222,128,0.1);   color: var(--green); border: 1px solid rgba(74,222,128,0.2); }
.rule-name  { font-size: 14px; font-weight: 600; color: var(--text); }
.rule-desc  { font-size: 13px; color: var(--text-muted); line-height: 1.75; }

/* ── LAYER STACK ── */
.layer-stack { display: flex; flex-direction: column; gap: 6px; margin: 14px 0; }
.layer-item {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 16px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 6px;
}
.layer-item.hi { border-color: rgba(91,158,255,0.3); background: var(--accent-dim); }
.layer-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.d-blue   { background: var(--accent);  }
.d-purple { background: var(--purple);  }
.d-green  { background: var(--green);   }
.d-yellow { background: var(--yellow);  }
.d-red    { background: var(--red);     }
.layer-name { font-size: 13px; font-weight: 500; color: var(--text); min-width: 180px; }
.layer-role { font-size: 12px; color: var(--text-muted); }
.layer-arrow { font-size: 11px; color: var(--text-muted); padding-left: 24px; margin: 2px 0; }

/* ── LAYER ROW (architecture diagram) ── */
.layer-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 6px;
}
.layer-chip {
  font-size: 12px; font-weight: 500;
  padding: 3px 10px; border-radius: 4px; border: 1px solid;
  flex-shrink: 0; min-width: 160px; text-align: center;
}
.layer-row .layer-arrow {
  font-size: 13px; color: var(--text-muted);
  padding: 0; margin: 0; flex-shrink: 0;
}
.layer-row .layer-desc {
  font-size: 12px; color: var(--text-sub); line-height: 1.5;
}

/* ── CHECK/X LISTS ── */
.check-list, .x-list { list-style: none; margin: 10px 0; }
.check-list li, .x-list li { padding: 3px 0; font-size: 13px; color: var(--text-sub); }
.check-list li::before { content: '✓ '; color: var(--green); }
.x-list li::before     { content: '✗ '; color: var(--red);   }

/* ── CMD BADGE ── */
.cmd-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; background: var(--bg-card);
  border: 1px solid var(--border-bright); border-radius: 6px;
  font-size: 13px; color: var(--text); margin-bottom: 16px;
}
.cmd-badge .dollar { color: var(--text-muted); }

/* ── DIVIDER ── */
hr { border: none; border-top: 1px solid var(--border); margin: 44px 0; }

/* ── PAGE NAV ── */
.page-nav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--border);
}
.page-nav a {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--text-muted); text-decoration: none;
  padding: 8px 14px; border: 1px solid var(--border-bright); border-radius: 6px;
  transition: color 0.2s, border-color 0.2s;
}
.page-nav a:hover { color: var(--text); border-color: #3a3a3a; }
.page-nav a span { color: var(--text-sub); font-size: 11px; display: block; }

/* ── RESPONSIVE ── */

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 20px; height: 14px;
  background: none; border: none; cursor: pointer;
  padding: 0; flex-shrink: 0;
}
.nav-hamburger span {
  display: block; width: 100%; height: 1.5px;
  background: var(--text-sub); border-radius: 2px;
  transition: transform 0.22s ease, opacity 0.22s ease;
}
.nav-hamburger.active span:nth-child(1) { transform: translateY(6.25px) rotate(45deg); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: translateY(-6.25px) rotate(-45deg); }

/* Sidebar overlay (mobile) */
.sidebar-overlay {
  display: none;
  position: fixed; inset: 0; z-index: 89;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

/* Tablet */
@media (max-width: 1100px) {
  :root { --sidebar-w: 240px; }
  .content { padding: 44px 48px 80px; }
}

/* Mobile */
@media (max-width: 768px) {
  .nav-hamburger { display: flex; }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.26s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 90;
  }
  .sidebar.sidebar--open { transform: translateX(0); }

  .content {
    margin-left: 0;
    padding: 36px 24px 72px;
    max-width: 100%;
  }

  h1 { font-size: 24px; letter-spacing: -1px; }
  h2 { font-size: 17px; margin-top: 32px; }

  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .layer-chip { min-width: 100px; font-size: 11px; }
  .layer-row { flex-wrap: wrap; }
}

/* Small mobile */
@media (max-width: 480px) {
  .topnav { padding: 0 16px; gap: 12px; }
  .topnav-ver { display: none; }

  .content { padding: 24px 16px 60px; }

  h1 { font-size: 21px; }
  h2 { font-size: 16px; }

  pre { padding: 14px 16px; font-size: 12px; }
  pre code { font-size: 12px; }

  .rule-card { padding: 14px 16px; }
  .layer-chip { min-width: 88px; }

  .page-nav { flex-direction: column; gap: 10px; }
  .page-nav a { width: 100%; justify-content: center; }
}