/* Self-hosted technical mono: IBM Plex Mono (OFL 1.1), static 500/600, latin + vietnamese
   subsets. Family name is site-prefixed ("VNPT Mono") so @font-face cannot leak. */
@font-face{font-family:"VNPT Mono";font-style:normal;font-weight:500;font-display:swap;src:url("./font-plexmono-500-latin.woff2") format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:"VNPT Mono";font-style:normal;font-weight:500;font-display:swap;src:url("./font-plexmono-500-vietnamese.woff2") format("woff2");unicode-range:U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB}
@font-face{font-family:"VNPT Mono";font-style:normal;font-weight:600;font-display:swap;src:url("./font-plexmono-600-latin.woff2") format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:"VNPT Mono";font-style:normal;font-weight:600;font-display:swap;src:url("./font-plexmono-600-vietnamese.woff2") format("woff2");unicode-range:U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB}
/* ============================================================
   VNPT concept — scoped under [data-site="vnpt"]
   Direction 2026-2030: Infrastructure Constellation
   Fingerprint: constellation node nav · vin constellation sky ·
   mono coordinate technical · node beacon columns ·
   coordinate header breaks · night infrastructure glow ·
   signal lines beacon dots · pulse network
   ============================================================ */

[data-site="vnpt"] {
  --vp-canvas: #081426;
  --vp-surface: #0d1d35;
  --vp-surface-up: #122744;
  --vp-text: #ddeaf7;
  --vp-muted: #8aa5c2;
  --vp-sky: #2fa8f5;
  --vp-sky-deep: #1b7fc4;
  --vp-signal: #5be3a8;
  --vp-beacon: #7fc4ff;
  --vp-line: #1e3a5f;
  --vp-border: #1e3a5f;
  --vp-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
  --vp-container: 76rem;
  --vp-t-fast: 130ms;
  --vp-t-base: 220ms;

  font-family: system-ui, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--vp-canvas);
  color: var(--vp-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  margin: 0;
}

[data-site="vnpt"] *,
[data-site="vnpt"] *::before,
[data-site="vnpt"] *::after { box-sizing: border-box; }

[data-site="vnpt"] h1,
[data-site="vnpt"] h2,
[data-site="vnpt"] h3 {
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 0 0 0.6em;
}

[data-site="vnpt"] p { margin: 0 0 1em; }
[data-site="vnpt"] ul, [data-site="vnpt"] ol { margin: 0; padding: 0; list-style: none; }
[data-site="vnpt"] a { color: var(--vp-sky); }
[data-site="vnpt"] svg { max-width: 100%; }

[data-site="vnpt"] :focus-visible {
  outline: 3px solid var(--vp-sky);
  outline-offset: 3px;
  border-radius: 6px;
}

[data-site="vnpt"] .visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

[data-site="vnpt"] .skip {
  position: absolute;
  left: 1rem; top: -4rem;
  background: var(--vp-sky);
  color: #04101e;
  font-weight: 700;
  padding: 0.7rem 1.2rem;
  z-index: 100;
  text-decoration: none;
  transition: top var(--vp-t-fast) ease;
}
[data-site="vnpt"] .skip:focus { top: 1rem; }

[data-site="vnpt"] .container {
  width: min(100% - 2.5rem, var(--vp-container));
  margin-inline: auto;
}

[data-site="vnpt"] .mono { font-family: var(--vp-mono); }

/* ---------- concept strip ---------- */
[data-site="vnpt"] .concept-strip {
  background: #04101e;
  color: #7e9cbd;
  font-size: 0.8rem;
  padding: 0.55rem 1rem;
  text-align: center;
}
[data-site="vnpt"] .concept-tag {
  display: inline-block;
  background: var(--vp-signal);
  color: #04101e;
  font-weight: 800;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  padding: 0.12rem 0.6rem;
  margin-right: 0.5rem;
  vertical-align: 1px;
}

/* ---------- header ---------- */
[data-site="vnpt"] .site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 20, 38, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--vp-border);
}
[data-site="vnpt"] .header-inner {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  padding: 0.65rem 0;
}
[data-site="vnpt"] .brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--vp-sky);
}
[data-site="vnpt"] .brand-glyph {
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  background: var(--vp-surface-up);
  border: 1px solid var(--vp-line);
  border-radius: 10px;
  color: var(--vp-sky);
}
[data-site="vnpt"] .brand-text { display: flex; flex-direction: column; line-height: 1.15; }
[data-site="vnpt"] .brand-name { font-size: 1.25rem; font-weight: 900; letter-spacing: 0.06em; color: var(--vp-text); }
[data-site="vnpt"] .brand-sub {
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--vp-signal);
  text-transform: uppercase;
}
[data-site="vnpt"] .main-nav { margin-left: auto; }
[data-site="vnpt"] .main-nav ul { display: flex; gap: 0.15rem; flex-wrap: wrap; }
[data-site="vnpt"] .main-nav a {
  display: block;
  text-decoration: none;
  color: var(--vp-text);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.55rem 0.9rem;
  border-radius: 8px;
  transition: background var(--vp-t-fast) ease, color var(--vp-t-fast) ease;
}
[data-site="vnpt"] .main-nav a:hover { background: var(--vp-sky); color: #04101e; }
[data-site="vnpt"] .header-cta {
  text-decoration: none;
  font-weight: 700;
  font-size: 0.85rem;
  color: #04101e;
  background: var(--vp-signal);
  padding: 0.6rem 1.05rem;
  border-radius: 8px;
  white-space: nowrap;
  transition: background var(--vp-t-fast) ease;
}
[data-site="vnpt"] .header-cta:hover { background: #7bf0bb; }

[data-site="vnpt"] .nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 0.5rem;
  cursor: pointer;
  margin-left: auto;
}
[data-site="vnpt"] .nav-toggle span {
  width: 24px; height: 3px;
  background: var(--vp-sky);
}

/* ---------- hero ---------- */
[data-site="vnpt"] .hero { position: relative; padding: 4.25rem 0 0; }
[data-site="vnpt"] .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  color: var(--vp-signal);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}
[data-site="vnpt"] .chip {
  background: var(--vp-surface-up);
  border: 1px solid var(--vp-line);
  color: var(--vp-sky);
  padding: 0.18rem 0.7rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}
[data-site="vnpt"] .hero h1 {
  font-size: clamp(2.3rem, 5vw, 3.9rem);
  margin-bottom: 0.35em;
}
[data-site="vnpt"] .hero h1 em { font-style: normal; color: var(--vp-sky); }
[data-site="vnpt"] .lede { color: var(--vp-muted); max-width: 42rem; }
[data-site="vnpt"] .hero-actions { display: flex; gap: 0.8rem; flex-wrap: wrap; margin: 1.5rem 0 2.25rem; }

[data-site="vnpt"] .btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 800;
  border-radius: 8px;
  padding: 0.85rem 1.55rem;
  border: 2px solid transparent;
  transition: transform var(--vp-t-fast) ease, background var(--vp-t-fast) ease, border-color var(--vp-t-fast) ease;
}
[data-site="vnpt"] .btn-sky { background: var(--vp-sky); color: #04101e; }
[data-site="vnpt"] .btn-sky:hover { background: #5cbcff; transform: translateY(-2px); }
[data-site="vnpt"] .btn-outline { color: var(--vp-text); border-color: var(--vp-line); }
[data-site="vnpt"] .btn-outline:hover { border-color: var(--vp-sky); color: var(--vp-sky); }
[data-site="vnpt"] .btn-lg { padding: 1rem 1.9rem; font-size: 1rem; }


/* ---------- coordinate headers ---------- */
[data-site="vnpt"] .coord {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--vp-signal);
  margin: 0 0 0.9rem;
  text-transform: uppercase;
}

/* ---------- sections ---------- */
[data-site="vnpt"] .section { padding: 4rem 0; }
[data-site="vnpt"] .section-head { max-width: 44rem; margin-bottom: 2.25rem; }
[data-site="vnpt"] .section-head h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }
[data-site="vnpt"] .section-note { color: var(--vp-muted); }

/* beacons */
[data-site="vnpt"] .posts { padding: 3.25rem 0 1rem; }
[data-site="vnpt"] .beacon-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
[data-site="vnpt"] .beacon {
  background: var(--vp-surface);
  border: 1px solid var(--vp-border);
  border-radius: 12px;
  padding: 1.5rem 1.35rem;
  display: grid;
  gap: 0.45rem;
  align-content: start;
}
[data-site="vnpt"] .beacon-dot {
  position: relative;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--vp-sky);
  margin-bottom: 0.5rem;
}
[data-site="vnpt"] .beacon-dot::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid var(--vp-sky);
  opacity: 0.55;
  animation: vp-pulse 2.4s ease-out infinite;
}
[data-site="vnpt"] .dot-green { background: var(--vp-signal); }
[data-site="vnpt"] .dot-green::after { border-color: var(--vp-signal); }
@keyframes vp-pulse {
  from { transform: scale(0.6); opacity: 0.7; }
  to { transform: scale(1.9); opacity: 0; }
}
[data-site="vnpt"] .beacon-value {
  font-family: var(--vp-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--vp-text);
  line-height: 1.05;
}
[data-site="vnpt"] .beacon-label { font-size: 0.86rem; color: var(--vp-muted); }

/* node list */
[data-site="vnpt"] .node-list { display: grid; gap: 0.9rem; }
[data-site="vnpt"] .node-row {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1.25rem;
  align-items: start;
  background: var(--vp-surface);
  border: 1px solid var(--vp-border);
  border-radius: 12px;
  padding: 1.35rem 1.5rem;
  transition: border-color var(--vp-t-fast) ease;
}
[data-site="vnpt"] .node-row:hover { border-color: var(--vp-sky); }
[data-site="vnpt"] .node-idx {
  font-family: var(--vp-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--vp-signal);
  line-height: 1;
}
[data-site="vnpt"] .node-row h3 { font-size: 1.15rem; margin-bottom: 0.25em; }
[data-site="vnpt"] .node-row p { margin: 0; color: var(--vp-muted); font-size: 0.93rem; }

/* history */
[data-site="vnpt"] .history { background: var(--vp-surface); }
[data-site="vnpt"] .hist-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}
[data-site="vnpt"] .hist-steps li {
  background: var(--vp-surface-up);
  border: 1px solid var(--vp-border);
  border-top: 3px solid var(--vp-sky);
  border-radius: 10px;
  padding: 1.35rem 1.3rem;
}
[data-site="vnpt"] .h-year {
  display: block;
  font-family: var(--vp-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--vp-sky);
  line-height: 1.1;
}
[data-site="vnpt"] .hist-steps p { margin: 0.4em 0 0; color: var(--vp-muted); font-size: 0.9rem; }

[data-site="vnpt"] .fact-card {
  background: var(--vp-surface-up);
  border: 1px solid var(--vp-border);
  padding: 1.5rem 1.6rem;
  display: grid;
  gap: 0.9rem;
  margin: 0;
  max-width: 48rem;
  border-radius: 10px;
}
[data-site="vnpt"] .fact-card div {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 0.75rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px dashed var(--vp-line);
}
[data-site="vnpt"] .fact-card div:last-child { border-bottom: 0; padding-bottom: 0; }
[data-site="vnpt"] .fact-card dt {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--vp-muted);
}
[data-site="vnpt"] .fact-card dd { margin: 0; font-weight: 600; font-size: 0.94rem; }

/* cta */
[data-site="vnpt"] .cta { padding: 4rem 0; text-align: center; }
[data-site="vnpt"] .cta-inner h2 { font-size: clamp(1.8rem, 3.4vw, 2.5rem); }

/* footer */
[data-site="vnpt"] .site-footer {
  background: #040e1b;
  color: #7e9cbd;
  padding: 3.25rem 0 2rem;
  border-top: 1px solid var(--vp-border);
}
[data-site="vnpt"] .footer-brand { display: flex; align-items: baseline; gap: 0.9rem; margin-bottom: 1.4rem; flex-wrap: wrap; }
[data-site="vnpt"] .f-name { color: var(--vp-text); font-size: 1.25rem; font-weight: 900; letter-spacing: 0.06em; }
[data-site="vnpt"] .f-sub { font-size: 0.8rem; color: var(--vp-signal); }
[data-site="vnpt"] .footer-nav ul { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; margin-bottom: 1.6rem; }
[data-site="vnpt"] .footer-nav a { color: var(--vp-text); text-decoration: none; font-size: 0.9rem; font-weight: 600; }
[data-site="vnpt"] .footer-nav a:hover { color: var(--vp-signal); }
[data-site="vnpt"] .disclaimer {
  border-top: 1px solid var(--vp-border);
  padding-top: 1.4rem;
  font-size: 0.82rem;
  color: #6d89a8;
  max-width: 62rem;
}
[data-site="vnpt"] .colophon { font-size: 0.75rem; color: #7d99b8; }

/* ---------- responsive ---------- */
@media (max-width: 1020px) {
  [data-site="vnpt"] .beacon-grid { grid-template-columns: repeat(2, 1fr); }
  [data-site="vnpt"] .hist-steps { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  [data-site="vnpt"] .nav-toggle { display: flex; }
  [data-site="vnpt"] .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--vp-surface);
    border-bottom: 1px solid var(--vp-border);
    padding: 0.75rem 1.25rem 1.25rem;
  }
  [data-site="vnpt"] .main-nav.is-open { display: block; }
  [data-site="vnpt"] .main-nav ul { flex-direction: column; gap: 0.25rem; }
  [data-site="vnpt"] .header-cta { display: none; }
  }

@media (max-width: 520px) {
  [data-site="vnpt"] .beacon-grid,
  [data-site="vnpt"] .hist-steps { grid-template-columns: 1fr; }
  [data-site="vnpt"] .section { padding: 3rem 0; }
  [data-site="vnpt"] .fact-card div { grid-template-columns: 1fr; }
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  [data-site="vnpt"] *,
  [data-site="vnpt"] *::before,
  [data-site="vnpt"] *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- polish: motion layer 2 ---------- */
[data-site="vnpt"] .coord::before {
  content: "◉ ";
  color: var(--vp-signal);
  animation: vp-beep 2.2s ease-in-out infinite;
}
@keyframes vp-beep {
  50% { opacity: 0.35; }
}
[data-site="vnpt"] .node-row:hover .node-idx {
  text-shadow: 0 0 18px rgba(91, 227, 168, 0.8);
}
@keyframes vp-airs {
  to { transform: translateY(-8px); }
}

[data-site="vnpt"] h1,[data-site="vnpt"] h2,[data-site="vnpt"] h3,
[data-site="vnpt"] .coord,[data-site="vnpt"] .beacon-value,[data-site="vnpt"] .beacon-dot,[data-site="vnpt"] .node-idx,[data-site="vnpt"] .h-year { font-family: "VNPT Mono", ui-monospace, SFMono-Regular, Menlo, monospace; }
[data-site="vnpt"] h1,[data-site="vnpt"] h2,[data-site="vnpt"] h3,
[data-site="vnpt"] .coord,[data-site="vnpt"] .beacon-value,[data-site="vnpt"] .node-idx,[data-site="vnpt"] .h-year { font-weight: 600; }
[data-site="vnpt"] .sky { position: relative; margin: 0; height: clamp(320px, 46vw, 620px); overflow: hidden; background: #0a1220; }
[data-site="vnpt"] .sky img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; filter: saturate(.95) contrast(1.08) brightness(.92); }
[data-site="vnpt"] .sky figcaption { position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; padding: 44px 20px 16px; font-family: "VNPT Mono", ui-monospace, monospace; font-size: .66rem; line-height: 1.45; color: #cfe4ff; background: linear-gradient(transparent, rgba(6, 12, 24, .94)); }
[data-site="vnpt"] .from-net { padding-block: 3.5rem 1rem; }
[data-site="vnpt"] .from-head { max-width: 46rem; margin-bottom: 1.5rem; }
[data-site="vnpt"] .net-plates { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.15rem; }
[data-site="vnpt"] .net-plates figure { position: relative; margin: 0; aspect-ratio: 4 / 3; overflow: hidden; background: #0a1220; }
[data-site="vnpt"] .net-plates img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; filter: saturate(.95) contrast(1.08) brightness(.94); }
[data-site="vnpt"] .net-plates figcaption { position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; display: flex; flex-direction: column; gap: 3px; padding: 36px 16px 13px; color: #e8f2ff; background: linear-gradient(transparent, rgba(6, 12, 24, .92)); }
[data-site="vnpt"] .net-plates figcaption strong { font-family: "VNPT Mono", ui-monospace, monospace; font-size: 1rem; font-weight: 600; }
[data-site="vnpt"] .credit { font-size: .64rem; line-height: 1.4; color: #a9c4e0; }
@media (max-width: 900px) { [data-site="vnpt"] .net-plates { grid-template-columns: 1fr; } [data-site="vnpt"] .net-plates figure { aspect-ratio: 16 / 10; } }
@media (max-width: 700px) {
  /* at phone sizes the SVG labels fall below legible size; the node list below repeats every name */
  [data-site="vnpt"] .const-labels { font-size: 30px; }
  [data-site="vnpt"] .constellation svg { min-height: 260px; }
}

/* the signature move: member nodes joined by thin signal rays, with a slow pulse */
[data-site="vnpt"] .constellation { margin: 0 0 2rem; padding: 1.5rem 1rem 1rem; background: radial-gradient(120% 120% at 50% 40%, #0e1c33, #070d18); border: 1px solid #1d3457; }
[data-site="vnpt"] .constellation svg { display: block; width: 100%; height: auto; color: #7fb6ff; }
[data-site="vnpt"] .const-node { animation: vp-node-glow 3.6s ease-in-out infinite alternate; transform-origin: center; }
[data-site="vnpt"] .const-node:nth-child(2) { animation-delay: .4s; }
[data-site="vnpt"] .const-node:nth-child(3) { animation-delay: .8s; }
[data-site="vnpt"] .const-node:nth-child(4) { animation-delay: 1.2s; }
[data-site="vnpt"] .const-node:nth-child(5) { animation-delay: 1.6s; }
[data-site="vnpt"] .const-node:nth-child(6) { animation-delay: 2s; }
@keyframes vp-node-glow { from { opacity: .55 } to { opacity: 1 } }
[data-site="vnpt"] .const-labels { font-family: "VNPT Mono", ui-monospace, monospace; letter-spacing: .04em; }
[data-site="vnpt"] .constellation figcaption { margin-top: .9rem; font-size: .7rem; line-height: 1.45; color: #8fa9c9; }