:root {
  --bg: #060a11;
  --bg-raised: #0b121e;
  --panel: rgba(14, 22, 36, 0.78);
  --panel-solid: #0e1624;
  --border: rgba(125, 211, 252, 0.13);
  --border-strong: rgba(125, 211, 252, 0.32);
  --text: #d6e2f2;
  --text-strong: #f2f7ff;
  --muted: #8193ad;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.35);
  --violet: #a78bfa;
  --mint: #5eead4;
  --green: #4ade80;
  --amber: #fbbf24;
  --rose: #fb7185;
  --sidebar-w: 284px;
  --toc-w: 220px;
  --radius: 12px;
  --mono: "JetBrains Mono", "Cascadia Code", "SF Mono", Consolas, "Liberation Mono", monospace;
  --sans: "Inter", "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16.5px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 12% -8%, rgba(56, 189, 248, 0.16), transparent 62%),
    radial-gradient(760px 520px at 105% 108%, rgba(167, 139, 250, 0.12), transparent 60%),
    radial-gradient(520px 360px at 70% 30%, rgba(94, 234, 212, 0.05), transparent 70%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(125, 211, 252, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 211, 252, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at 40% 20%, black 20%, transparent 75%);
  pointer-events: none;
}

::selection { background: rgba(56, 189, 248, 0.35); color: var(--text-strong); }

a { color: var(--accent); text-decoration: none; transition: color .15s, text-shadow .15s; }
a:hover { color: var(--text-strong); text-shadow: 0 0 14px var(--accent-glow); }
main a { text-decoration: underline; text-decoration-color: rgba(125, 211, 252, 0.35); text-underline-offset: 3px; }
main a:hover { text-decoration-color: var(--accent); }

/* ---------- layout ---------- */

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  overflow-y: auto;
  padding: 22px 18px 40px;
  background: linear-gradient(180deg, rgba(9, 15, 26, 0.94), rgba(6, 10, 17, 0.94));
  border-right: 1px solid var(--border);
  backdrop-filter: blur(10px);
  scrollbar-width: thin;
  scrollbar-color: rgba(125, 211, 252, 0.2) transparent;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px 20px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
  color: var(--text-strong);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.brand:hover { text-shadow: none; }
.brand-mark {
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15), 0 0 18px var(--accent-strong);
  animation: pulse 3.2s ease-in-out infinite;
}
.brand small { display: block; color: var(--muted); letter-spacing: 0.08em; font-size: 10.5px; margin-top: 2px; }

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15), 0 0 14px var(--accent-strong); }
  50% { box-shadow: 0 0 0 7px rgba(56, 189, 248, 0.06), 0 0 26px var(--accent-strong); }
}

.nav-group { margin-top: 18px; }
.nav-label {
  padding: 0 10px 6px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.nav-group ul, .nav-group details ul { list-style: none; margin: 0; padding: 0; }
.nav-link {
  position: relative;
  display: block;
  padding: 6px 10px;
  border-radius: 8px;
  color: #a9b8cc;
  font-size: 14px;
  line-height: 1.4;
  transition: background .15s, color .15s;
}
.nav-link:hover { background: rgba(125, 211, 252, 0.07); color: var(--text-strong); text-shadow: none; }
.nav-link.active {
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.16), rgba(56, 189, 248, 0.02));
  color: var(--text-strong);
}
.nav-link.active::before {
  content: "";
  position: absolute;
  left: -18px; top: 6px; bottom: 6px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-strong);
}
.nav-group details summary {
  cursor: pointer;
  padding: 6px 10px;
  color: #a9b8cc;
  font-size: 14px;
  border-radius: 8px;
  list-style: none;
}
.nav-group details summary::-webkit-details-marker { display: none; }
.nav-group details summary::before { content: "▸"; color: var(--accent); margin-right: 8px; display: inline-block; transition: transform .15s; }
.nav-group details[open] > summary::before { transform: rotate(90deg); }
.nav-group details summary:hover { background: rgba(125, 211, 252, 0.07); color: var(--text-strong); }
.nav-group details ul { padding-left: 14px; }
.nav-sub[open] > summary { color: var(--text-strong); }

.nav-top > summary.nav-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 10px;
  border-radius: 8px;
  cursor: pointer;
  list-style: none;
  transition: color .15s, background .15s;
}
.nav-top > summary.nav-label::-webkit-details-marker { display: none; }
.nav-top > summary.nav-label::after {
  content: "▸";
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0;
  transition: transform .15s;
}
.nav-top[open] > summary.nav-label::after { transform: rotate(90deg); }
.nav-top > summary.nav-label:hover { color: var(--accent); background: rgba(125, 211, 252, 0.05); }
.nav-top > summary.nav-label:focus-visible { outline: 1px solid var(--accent); outline-offset: 2px; }
.nav-top[open] > summary.nav-label { margin-bottom: 4px; }

.page {
  margin-left: var(--sidebar-w);
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--toc-w);
  gap: 48px;
  max-width: 1240px;
  padding: 56px 48px 80px;
}
.page.no-toc { grid-template-columns: minmax(0, 1fr); max-width: 980px; }

main { min-width: 0; max-width: 820px; }

.toc {
  position: sticky;
  top: 40px;
  align-self: start;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding-left: 16px;
  border-left: 1px solid var(--border);
  font-size: 13px;
}
.toc-title {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.toc a { display: block; padding: 4px 0; color: var(--muted); line-height: 1.4; }
.toc a:hover { color: var(--text-strong); text-shadow: none; }
.toc a.active { color: var(--accent); text-shadow: 0 0 12px var(--accent-glow); }

a.term {
  color: inherit;
  text-decoration: underline dotted rgba(125, 211, 252, 0.75);
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
  cursor: help;
}
a.term:hover, a.term:focus-visible { color: var(--accent); text-shadow: none; }

.term-tip {
  position: fixed;
  z-index: 50;
  max-width: 320px;
  padding: 10px 13px;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: rgba(9, 15, 26, 0.97);
  box-shadow: 0 18px 40px -16px rgba(0, 0, 0, 0.8), 0 0 24px -8px var(--accent-glow);
  color: var(--text);
  font-size: 13.5px;
  line-height: 1.5;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity .12s ease, transform .12s ease;
}
.term-tip.visible { opacity: 1; transform: none; }
.term-tip strong {
  display: block;
  margin-bottom: 3px;
  color: var(--accent);
  font: 600 11px var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

main h3[id]:target { color: var(--accent); text-shadow: 0 0 14px var(--accent-glow); }

.gloss-jump { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 26px; }
.gloss-jump a {
  min-width: 30px;
  padding: 4px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(56, 189, 248, 0.05);
  color: var(--accent);
  font: 600 12px var(--mono);
  text-align: center;
  text-decoration: none;
}
.gloss-jump a:hover { border-color: var(--border-strong); background: rgba(56, 189, 248, 0.12); }
.gloss-grid { display: grid; gap: 12px; }
.gloss-entry {
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-left: 2px solid rgba(125, 211, 252, 0.45);
  border-radius: var(--radius);
  background: var(--panel);
  scroll-margin-top: 24px;
}
.gloss-entry:has(h3:target) { border-color: var(--border-strong); box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.2), 0 0 30px -10px var(--accent-glow); }
.gloss-entry h3 { margin: 0 0 6px; scroll-margin-top: 24px; }
.gloss-entry p { margin: 0; }
.gloss-entry p + p { margin-top: 6px; }
.gloss-entry p.aka { color: var(--muted); font-size: 13px; font-family: var(--mono); letter-spacing: 0.02em; }

.page.wide { max-width: 1280px; }
.page.wide main { max-width: 1180px; }
.page.wide main > :not(.table-wrap):not(.pager):not(.site-footer):not(.toc-inline) { max-width: 820px; }

.toc-inline { display: flex; flex-wrap: wrap; gap: 8px; margin: -6px 0 30px; }
.toc-inline a {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.05);
  color: var(--muted);
  font-size: 13px;
}
.toc-inline a:hover { color: var(--accent); border-color: var(--border-strong); text-shadow: none; }

/* ---------- typography ---------- */

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding: 4px 11px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.06);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.kicker::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent-strong); }

h1, h2, h3, h4 { color: var(--text-strong); line-height: 1.25; font-weight: 650; letter-spacing: -0.015em; }

h1 {
  margin: 0 0 22px;
  font-size: clamp(30px, 4vw, 42px);
  letter-spacing: -0.025em;
  background: linear-gradient(100deg, #f2f7ff 0%, var(--accent) 55%, var(--violet) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h2 {
  position: relative;
  margin: 52px 0 16px;
  padding-top: 22px;
  font-size: 24px;
  border-top: 1px solid var(--border);
}
h2::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 64px; height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  box-shadow: 0 0 12px var(--accent-strong);
}
h3 { margin: 34px 0 10px; font-size: 19px; color: var(--accent); }
h4 { margin: 26px 0 8px; font-size: 16px; color: var(--mint); }

p, ul, ol { margin: 0 0 16px; }
li { margin: 4px 0; }
li::marker { color: var(--accent-strong); }
strong { color: var(--text-strong); font-weight: 650; }
hr { border: 0; height: 1px; margin: 40px 0; background: linear-gradient(90deg, transparent, var(--border-strong), transparent); }

/* ---------- home ---------- */

.page-home h1 { font-size: clamp(34px, 5vw, 54px); line-height: 1.08; margin-bottom: 26px; }
.page-home main > p:first-of-type { font-size: 19px; color: #c3d2e6; }

/* ---------- code ---------- */

code {
  padding: 2px 6px;
  border: 1px solid rgba(125, 211, 252, 0.16);
  border-radius: 6px;
  background: rgba(125, 211, 252, 0.07);
  color: #bfe8ff;
  font: 0.86em/1.5 var(--mono);
  word-break: break-word;
}

.code-block {
  position: relative;
  margin: 18px 0 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #04070d;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.4), 0 18px 40px -24px rgba(56, 189, 248, 0.35);
  overflow: hidden;
}
.code-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px 7px 14px;
  border-bottom: 1px solid var(--border);
  background: rgba(125, 211, 252, 0.04);
  color: var(--muted);
  font: 11px var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.code-bar .dots { display: inline-flex; gap: 6px; margin-right: 12px; }
.code-bar .dots i { width: 8px; height: 8px; border-radius: 50%; background: rgba(125, 211, 252, 0.25); }
.code-bar .dots i:nth-child(2) { background: rgba(167, 139, 250, 0.35); }
.code-bar .dots i:nth-child(3) { background: rgba(94, 234, 212, 0.35); }
.copy-btn {
  padding: 3px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: transparent;
  color: var(--accent);
  font: 11px var(--mono);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background .15s, box-shadow .15s;
}
.copy-btn:hover { background: rgba(56, 189, 248, 0.12); box-shadow: 0 0 14px var(--accent-glow); }
.copy-btn.copied { color: var(--green); border-color: rgba(74, 222, 128, 0.5); }
pre { margin: 0; padding: 16px 18px; overflow-x: auto; }
pre code { padding: 0; border: 0; background: none; color: #d6f0ff; font-size: 13.5px; word-break: normal; }

/* ---------- tables ---------- */

.table-wrap {
  margin: 20px 0 26px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 24px 50px -36px rgba(56, 189, 248, 0.45);
}
table { width: 100%; border-collapse: collapse; font-size: 14.5px; line-height: 1.55; }
thead th {
  padding: 12px 14px;
  text-align: left;
  white-space: nowrap;
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.12), rgba(56, 189, 248, 0.04));
  border-bottom: 1px solid var(--border-strong);
  color: var(--accent);
  font: 600 11.5px var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
tbody td { padding: 12px 14px; vertical-align: top; border-bottom: 1px solid rgba(125, 211, 252, 0.07); }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:nth-child(even) td { background: rgba(255, 255, 255, 0.012); }
tbody tr:hover td { background: rgba(56, 189, 248, 0.05); }
.table-wrap.wide thead th { white-space: normal; min-width: 8.5em; }
.table-wrap.wide tbody td { min-width: 8.5em; }
tbody td:first-child { color: var(--text-strong); font-weight: 550; }

/* ---------- badges ---------- */

.badge {
  display: inline-block;
  padding: 1px 8px;
  margin: 1px 2px 1px 0;
  border: 1px solid currentColor;
  border-radius: 999px;
  font: 600 11px/1.7 var(--mono);
  letter-spacing: 0.04em;
  white-space: nowrap;
  vertical-align: 1px;
}
.badge-ban { color: var(--rose); background: rgba(251, 113, 133, 0.08); }
.badge-bill { color: var(--amber); background: rgba(251, 191, 36, 0.08); }
.badge-privacy { color: var(--violet); background: rgba(167, 139, 250, 0.09); }
.badge-hardware { color: var(--mint); background: rgba(94, 234, 212, 0.07); }
.badge-safe { color: var(--green); background: rgba(74, 222, 128, 0.07); }

/* ---------- callouts ---------- */

blockquote {
  margin: 18px 0 22px;
  padding: 14px 18px;
  border: 1px solid rgba(167, 139, 250, 0.22);
  border-left: 3px solid var(--violet);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(167, 139, 250, 0.06);
  color: #dcd6fb;
}
blockquote p:last-child { margin-bottom: 0; }

blockquote.callout-warn { border-color: rgba(251, 191, 36, 0.3); border-left-color: var(--amber); background: rgba(251, 191, 36, 0.06); color: #f7e8c2; }
blockquote.callout-note { border-color: rgba(125, 211, 252, 0.28); border-left-color: var(--accent); background: rgba(56, 189, 248, 0.06); color: #d4ecfb; }

.checkpoint {
  position: relative;
  padding: 12px 16px 12px 16px;
  border: 1px solid rgba(94, 234, 212, 0.22);
  border-radius: var(--radius);
  background: linear-gradient(90deg, rgba(94, 234, 212, 0.09), rgba(94, 234, 212, 0.02));
  color: #d3f5ee;
}
.checkpoint-tag {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 9px;
  border-radius: 999px;
  background: rgba(94, 234, 212, 0.14);
  color: var(--mint);
  font: 600 11px/1.8 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.checkpoint-tag::before { content: "✓ "; }

/* ---------- pager & footer ---------- */

.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 56px; }
.pager a {
  display: block;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  text-decoration: none;
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
.pager a:hover { border-color: var(--border-strong); box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.15), 0 14px 34px -18px var(--accent-glow); transform: translateY(-1px); text-shadow: none; }
.pager .next { text-align: right; grid-column: 2; }
.pager small { display: block; color: var(--muted); font: 11px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; }
.pager span { color: var(--text-strong); font-weight: 600; }

.site-footer {
  margin-top: 40px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font: 12px var(--mono);
  letter-spacing: 0.05em;
}

/* ---------- mobile ---------- */

.menu-btn { display: none; }

@media (max-width: 1180px) {
  .page { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
}

@media (max-width: 860px) {
  .sidebar { transform: translateX(-100%); transition: transform .2s ease; z-index: 20; width: 86vw; max-width: 320px; }
  body.nav-open .sidebar { transform: none; box-shadow: 0 0 60px rgba(0, 0, 0, 0.7); }
  .page { margin-left: 0; padding: 76px 20px 60px; }
  .menu-btn {
    display: inline-flex;
    position: fixed;
    top: 14px; left: 14px;
    z-index: 30;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: rgba(9, 15, 26, 0.9);
    color: var(--accent);
    font: 12px var(--mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    backdrop-filter: blur(8px);
  }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}