/* 22div Unified Theme - matches portfolio template */
:root {
  --bg: #000;
  --surface: #212424;
  --line: #2b2f2f;
  --text: #fff;
  --muted: #a7adad;
  --accent: #00c4ff;
  --accent-ink: #001016;
  --max: 1360px;
  --gutter: 40px;
  --ease: cubic-bezier(.22,1,.36,1);
  /* Additional colors for callout boxes */
  --green: #00ff88;
  --red: #ff4757;
  --amber: #e3b341;
  --purple: #a78bfa;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.5 Inter, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
h1, h2, h3 { font-weight: 300; letter-spacing: -.02em; margin: 0; }
.accent { color: var(--accent); }
.label { font-size: 13px; color: var(--muted); letter-spacing: .02em; }

/* ---------- Header ---------- */
header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: rgba(0,0,0,.72);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  font-size: 15px;
}
.brand .mark {
  width: 28px;
  height: 18px;
  background: var(--accent);
  clip-path: polygon(0 100%, 35% 0, 65% 0, 100% 100%, 70% 100%, 50% 45%, 30% 100%);
}
nav ul {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
}
nav li a {
  position: relative;
  padding: 6px 0;
}
nav li a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 0;
  background: var(--accent);
  transition: width .3s var(--ease);
}
nav li a:hover::after { width: 100%; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--accent);
  transition: transform .3s var(--ease), background .3s, color .3s;
}
.btn.fill { background: var(--accent); color: var(--accent-ink); }
.btn:hover { transform: translateY(-2px); }
.btn.ghost { color: var(--text); }
.btn.ghost:hover { background: var(--accent); color: var(--accent-ink); }
.cta-row { display: flex; gap: 10px; align-items: center; }

/* ---------- Article/Doc styles ---------- */
.doc {
  max-width: 860px;
  margin: 0 auto;
  padding: 120px var(--gutter) 80px;
}
.doc h1 {
  font-size: clamp(36px, 5vw, 64px);
  margin-bottom: 40px;
}
.doc h2 {
  font-size: 28px;
  margin: 72px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--text);
}
.doc h3 {
  font-size: 18px;
  font-weight: 500;
  margin: 36px 0 10px;
  color: var(--accent);
}
.doc p, .doc li {
  color: var(--muted);
  line-height: 1.65;
}
.doc strong {
  color: var(--text);
  font-weight: 500;
}
.doc code {
  font: 13px/1.5 ui-monospace, Menlo, Consolas, monospace;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--text);
}
.doc pre {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 18px 20px;
  overflow: auto;
  margin: 14px 0 22px;
}
.doc pre code {
  border: 0;
  padding: 0;
  background: none;
  color: var(--accent);
}
.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 14px 0 22px;
}
.doc th, .doc td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.doc th {
  color: var(--muted);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.doc a { color: var(--accent); }
.doc hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}
.doc ul, .doc ol { padding-left: 22px; }
.doc p, .doc li, .doc td { overflow-wrap: anywhere; }

/* Table of contents */
.toc {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 20px 24px;
  margin: 0 0 40px;
}
.toc a {
  display: block;
  padding: 4px 0;
  color: var(--text);
  font-size: 14px;
}
.toc a:hover { color: var(--accent); }

/* ---------- Callout boxes ---------- */
.concept-box, .info-box {
  background: rgba(0,196,255,.05);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.concept-box h4, .info-box h4 {
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.warning-box {
  background: rgba(255,71,87,.08);
  border-left: 3px solid var(--red);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.warning-box h4 {
  color: var(--red);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.success-box {
  background: rgba(0,255,136,.06);
  border-left: 3px solid var(--green);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.success-box h4 {
  color: var(--green);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.amber-box {
  background: rgba(227,179,65,.07);
  border-left: 3px solid var(--amber);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.amber-box h4 {
  color: var(--amber);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.layman-box {
  background: rgba(167,139,250,.05);
  border-left: 3px solid var(--purple);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}
.layman-label {
  font-size: 0.6rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.4rem;
}
.layman-tldr {
  font-size: 0.85rem;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 0.4rem;
}

/* ---------- Tags and badges ---------- */
.tag {
  display: inline-block;
  background: rgba(0,196,255,.1);
  color: var(--accent);
  padding: 0.2rem 0.6rem;
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}
.mitre-tag {
  display: inline-block;
  background: rgba(167,139,250,.15);
  color: var(--purple);
  padding: 0.15rem 0.5rem;
  font-size: 0.65rem;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  margin-right: 0.5rem;
}
.status-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.badge-validated { background: rgba(0,255,136,.15); color: var(--green); }
.badge-research { background: rgba(227,179,65,.15); color: var(--amber); }
.badge-pending { background: rgba(136,136,136,.15); color: var(--muted); }

/* ---------- Article meta ---------- */
.article-meta {
  color: var(--muted);
  font-size: 0.8rem;
  margin-bottom: 2rem;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* ---------- Diagrams ---------- */
.diagram {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.5rem;
  margin: 1.5rem 0;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.7rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  color: var(--muted);
}
.highlight { color: var(--green); }
.highlight-amber { color: var(--amber); }
.highlight-red { color: var(--red); }
.highlight-purple { color: var(--purple); }

/* ---------- Grid cards (listings) ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 24px;
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}
.card h3 {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: 8px;
}
.card p {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}
.card-tag {
  font-size: 0.6rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.card-footer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}
.read-more { color: var(--accent); }

/* ---------- Footer ---------- */
footer {
  padding: 40px 0;
  border-top: 1px solid var(--line);
  margin-top: 80px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-brand {
  font-size: 14px;
  color: var(--muted);
}
.footer-links {
  display: flex;
  gap: 24px;
}
.footer-links a {
  font-size: 13px;
  color: var(--muted);
  transition: color .2s;
}
.footer-links a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  :root { --gutter: 24px; }
  .doc { padding-top: 100px; }
  .doc table { display: block; overflow-x: auto; white-space: nowrap; }
  .doc h1 { font-size: 36px; }
  nav ul { display: none; }
  .cta-row { display: none; }
  .cards-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 24px;
  cursor: pointer;
}
@media (max-width: 900px) {
  .nav-toggle { display: block; }
}