/* ==========================================================================
   MON GROUP VIETNAM JSC — mongroup.org
   ========================================================================== */

/* --- reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, figure, dl, dd, ol, ul { margin: 0; padding: 0; }
ol, ul { list-style: none; }
img, svg, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* --- tokens --------------------------------------------------------------- */
:root {
  --bg:          #08090b;
  --bg-soft:     #0d0f13;
  --ink:         #eceef2;
  --ink-2:       #a3a8b3;
  --ink-3:       #6c7280;
  --line:        rgba(255,255,255,.085);
  --line-soft:   rgba(255,255,255,.05);
  --line-strong: rgba(255,255,255,.17);
  --accent:      #8fb0ff;
  --accent-soft: rgba(143,176,255,.13);

  --sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --hdr: 64px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

/* --- base ----------------------------------------------------------------- */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection { background: rgba(143,176,255,.26); color: #fff; }

:focus-visible {
  outline: 1.5px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.mono { font-family: var(--mono); font-size: .93em; letter-spacing: .01em; }

.wrap {
  width: min(1160px, 100% - 48px);
  margin-inline: auto;
}
@media (max-width: 640px) { .wrap { width: min(1160px, 100% - 36px); } }

.skip-link {
  position: absolute;
  left: 16px; top: -60px;
  z-index: 999;
  padding: 10px 16px;
  background: var(--ink);
  color: var(--bg);
  font-size: 14px;
  border-radius: 8px;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 16px; }

/* ==========================================================================
   Background
   ========================================================================== */
.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
#bg-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .78;
  will-change: transform;
}
.glow--a {
  width: 62vmax; height: 62vmax;
  top: -26vmax; left: -14vmax;
  background: radial-gradient(circle, rgba(72,106,198,.4) 0%, rgba(70,102,190,0) 62%);
  animation: drift-a 44s ease-in-out infinite alternate;
}
.glow--b {
  width: 54vmax; height: 54vmax;
  bottom: -24vmax; right: -12vmax;
  background: radial-gradient(circle, rgba(122,98,182,.32) 0%, rgba(120,96,178,0) 64%);
  animation: drift-b 56s ease-in-out infinite alternate;
}
@keyframes drift-a { to { transform: translate3d(9vmax, 6vmax, 0) scale(1.12); } }
@keyframes drift-b { to { transform: translate3d(-8vmax, -7vmax, 0) scale(1.08); } }

.bg-vignette {
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(8,9,11,0) 34%, rgba(8,9,11,.55) 100%),
    linear-gradient(180deg, rgba(8,9,11,.42) 0%, rgba(8,9,11,0) 24%, rgba(8,9,11,0) 76%, rgba(8,9,11,.7) 100%);
}
.bg-grain {
  position: absolute; inset: -50%;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
}
@media (prefers-reduced-motion: reduce) {
  .glow--a, .glow--b { animation: none; }
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--hdr);
  display: flex;
  align-items: center;
  transition: background .35s var(--ease), border-color .35s var(--ease), backdrop-filter .35s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-stuck {
  background: rgba(8,9,11,.72);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
  backdrop-filter: saturate(140%) blur(16px);
  border-bottom-color: var(--line-soft);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 11px; margin-right: auto; }
.brand-mark { color: var(--accent); flex: none; transition: transform .5s var(--ease); }
.brand:hover .brand-mark { transform: translateY(-1px); }
.brand-text { display: flex; align-items: baseline; gap: 7px; }
.brand-name {
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.005em;
}
.brand-suffix {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .17em;
  color: var(--ink-3);
  padding-left: 7px;
  border-left: 1px solid var(--line);
}

.site-nav { display: flex; gap: 26px; }
.site-nav a {
  font-size: 14px;
  color: var(--ink-2);
  transition: color .22s var(--ease);
  position: relative;
}
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--ease);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { transform: scaleX(1); }

.header-actions { display: flex; align-items: center; gap: 18px; }

.lang { display: flex; align-items: center; gap: 8px; }
.lang-btn {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-3);
  padding: 3px 1px;
  transition: color .22s var(--ease);
}
.lang-btn:hover { color: var(--ink-2); }
.lang-btn.is-active { color: var(--ink); }
.lang-sep { width: 1px; height: 11px; background: var(--line); }

/* --- buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  transition: background .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn--sm { height: 34px; padding: 0 15px; font-size: 13.5px; border-radius: 999px; }
.btn--primary {
  background: var(--ink);
  border-color: var(--ink);
  color: #0a0b0d;
  font-weight: 500;
}
.btn--primary:hover { background: #fff; border-color: #fff; }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--ink-2); }
.btn--ghost:hover { border-color: var(--line-strong); color: var(--ink); }

@media (max-width: 860px) {
  .site-nav { display: none; }
}
@media (max-width: 520px) {
  .header-actions .btn { display: none; }
  .brand-suffix { display: none; }
}

/* ==========================================================================
   Layout primitives
   ========================================================================== */
main { position: relative; z-index: 1; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .17em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.eyebrow i { font-style: normal; color: var(--accent); }
.eyebrow .dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.section { padding: clamp(72px, 9vw, 128px) 0; border-top: 1px solid var(--line-soft); }
.section-grid {
  display: grid;
  grid-template-columns: 168px minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}
.section-label { position: sticky; top: calc(var(--hdr) + 32px); padding-top: 6px; }
.section-body h2 {
  font-size: clamp(1.55rem, 2.7vw, 2.2rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.028em;
  max-width: 21ch;
  text-wrap: balance;
  margin-bottom: 28px;
}
@media (max-width: 820px) {
  .section-grid { grid-template-columns: 1fr; }
  .section-label { position: static; margin-bottom: 4px; }
}

.prose p {
  color: var(--ink-2);
  font-size: 16.5px;
  line-height: 1.72;
  max-width: 66ch;
}
.prose p + p { margin-top: 18px; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding-top: calc(var(--hdr) + clamp(72px, 13vh, 132px));
  padding-bottom: clamp(64px, 10vh, 112px);
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(32px, 6vw, 80px);
  align-items: end;
}
.hero-title {
  margin: 22px 0 26px;
  font-size: clamp(2.35rem, 6.1vw, 4.35rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.038em;
  max-width: 15ch;
  text-wrap: balance;
}
.hero-title em {
  font-style: normal;
  color: var(--ink-3);
}
.hero-sub {
  color: var(--ink-2);
  font-size: clamp(16px, 1.35vw, 17.5px);
  line-height: 1.68;
  max-width: 54ch;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }

.hero-facts {
  display: grid;
  gap: 20px;
  min-width: 214px;
  padding-bottom: 6px;
}
.fact { display: grid; gap: 5px; padding-top: 14px; border-top: 1px solid var(--line); }
.fact-k {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.fact-v { font-size: 14.5px; color: var(--ink); }

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-facts {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    width: 100%;
    margin-top: 12px;
  }
}

/* ==========================================================================
   Key / value lists
   ========================================================================== */
.keyvals, .contact-grid {
  margin-top: 44px;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
/* Fixed track counts: auto-fit leaves an orphan cell when the item count
   and the available width disagree. */
.keyvals { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.contact-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.doc-hero .keyvals { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 980px) { .doc-hero .keyvals { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 760px) { .contact-grid { grid-template-columns: 1fr; } }
@media (max-width: 620px) {
  .keyvals, .doc-hero .keyvals { grid-template-columns: 1fr; }
}
.kv {
  background: var(--bg);
  padding: 20px 22px;
  display: grid;
  gap: 7px;
  align-content: start;
}
.kv dt {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.kv dd { font-size: 14.5px; color: var(--ink); line-height: 1.55; }
.kv dd a { border-bottom: 1px solid var(--line-strong); transition: border-color .2s var(--ease); }
.kv dd a:hover { border-bottom-color: var(--accent); color: var(--accent); }

/* ==========================================================================
   Cards
   ========================================================================== */
.cards {
  margin-top: 6px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
@media (max-width: 620px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: var(--bg);
  padding: 30px 28px 32px;
  transition: background .3s var(--ease);
  position: relative;
}
.card::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(143,176,255,.05), rgba(143,176,255,0) 55%);
  opacity: 0;
  transition: opacity .35s var(--ease);
  pointer-events: none;
}
.card:hover::after { opacity: 1; }
.card-icon {
  width: 26px; height: 26px;
  fill: none;
  stroke: var(--ink-3);
  stroke-width: 1.35;
  stroke-linecap: round;
  stroke-linejoin: round;
  margin-bottom: 22px;
  transition: stroke .3s var(--ease);
}
.card:hover .card-icon { stroke: var(--accent); }
.card h3 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.012em;
  margin-bottom: 10px;
}
.card p { color: var(--ink-2); font-size: 14.5px; line-height: 1.68; }

/* ==========================================================================
   Panels (vision / mission)
   ========================================================================== */
.panels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
@media (max-width: 680px) { .panels { grid-template-columns: 1fr; } }
.panel {
  background: linear-gradient(180deg, rgba(255,255,255,.014), rgba(255,255,255,0) 60%), var(--bg);
  padding: 34px 30px 38px;
}
.panel-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .17em;
  text-transform: uppercase;
  color: var(--accent);
  padding-bottom: 16px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
  width: 100%;
}
.panel-text {
  font-size: 17px;
  line-height: 1.66;
  color: var(--ink);
  letter-spacing: -0.012em;
}

/* ==========================================================================
   Principles
   ========================================================================== */
.principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 40px);
}
@media (max-width: 760px) { .principles { grid-template-columns: 1fr; gap: 0; } }
@media (max-width: 760px) { .principle { padding: 20px 0 22px; } }
.principle { padding-top: 20px; border-top: 1px solid var(--line); }
.principle-n { display: block; color: var(--accent); font-size: 11px; letter-spacing: .16em; margin-bottom: 14px; }
.principle h3 { font-size: 15.5px; font-weight: 600; letter-spacing: -0.012em; margin-bottom: 9px; }
.principle p { color: var(--ink-2); font-size: 14.5px; line-height: 1.68; }

/* ==========================================================================
   Contact
   ========================================================================== */
.mail {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  margin-top: 34px;
  font-size: clamp(1.3rem, 3.2vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-strong);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.mail svg {
  width: 20px; height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform .3s var(--ease);
}
.mail:hover { color: var(--accent); border-bottom-color: var(--accent); }
.mail:hover svg { transform: translate(2px,-2px); }

.contact-links {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}
.contact-links a {
  font-size: 14px;
  color: var(--ink-2);
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.contact-links a:hover { color: var(--ink); border-bottom-color: var(--line-strong); }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-soft);
  padding: 40px 0 48px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px 40px;
}
.footer-legal { font-size: 13px; color: var(--ink-3); line-height: 1.7; max-width: 74ch; }
.footer-name { color: var(--ink-2); font-weight: 500; }
.footer-sep { padding: 0 7px; color: var(--line-strong); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.footer-nav a { font-size: 13px; color: var(--ink-3); transition: color .2s var(--ease); }
.footer-nav a:hover { color: var(--ink); }
.footer-copy { font-size: 13px; color: var(--ink-3); width: 100%; padding-top: 22px; border-top: 1px solid var(--line-soft); }

/* ==========================================================================
   Legal / document pages
   ========================================================================== */
.doc-hero {
  padding-top: calc(var(--hdr) + clamp(56px, 9vh, 92px));
  padding-bottom: clamp(34px, 5vh, 54px);
}
.doc-title {
  margin: 20px 0 16px;
  font-size: clamp(2rem, 4.6vw, 3.1rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.035em;
}
.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--ink-3);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  max-width: 640px;
}
.doc-intro { margin-top: 26px; color: var(--ink-2); font-size: 16.5px; line-height: 1.72; max-width: 66ch; }

.doc-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
  padding-bottom: clamp(72px, 10vw, 128px);
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(40px, 6vw, 64px);
}
.doc-toc { position: sticky; top: calc(var(--hdr) + 32px); }
.doc-toc-title {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .17em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.doc-toc ol { display: grid; gap: 9px; counter-reset: toc; }
.doc-toc a {
  display: block;
  font-size: 13.5px;
  color: var(--ink-3);
  line-height: 1.45;
  transition: color .2s var(--ease);
}
.doc-toc a:hover, .doc-toc a.is-current { color: var(--ink); }

.doc-body { max-width: 74ch; }
.doc-body section { scroll-margin-top: calc(var(--hdr) + 28px); }
.doc-body section + section { margin-top: 46px; padding-top: 46px; border-top: 1px solid var(--line-soft); }
.doc-body h2 {
  display: flex;
  gap: 14px;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
  margin-bottom: 16px;
}
.doc-body h2 span.num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  padding-top: 5px;
  flex: none;
}
.doc-body h3 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 26px 0 9px;
  color: var(--ink);
}
.doc-body p, .doc-body li {
  color: var(--ink-2);
  font-size: 15.5px;
  line-height: 1.75;
}
.doc-body p + p { margin-top: 14px; }
.doc-body ul + p { margin-top: 18px; }
.doc-body ul { margin-top: 12px; display: grid; gap: 9px; }
.doc-body ul li { position: relative; padding-left: 20px; }
.doc-body ul li::before {
  content: '';
  position: absolute;
  left: 2px; top: .72em;
  width: 5px; height: 1px;
  background: var(--line-strong);
}
.doc-body strong { color: var(--ink); font-weight: 500; }
.doc-body a { color: var(--ink); border-bottom: 1px solid var(--line-strong); transition: color .2s var(--ease), border-color .2s var(--ease); }
.doc-body a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.callout {
  margin-top: 20px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.015), rgba(255,255,255,0));
}
.callout p { font-size: 14.5px; }

@media (max-width: 860px) {
  .doc-layout { grid-template-columns: 1fr; }
  .doc-toc { position: static; display: none; }
}

/* ==========================================================================
   Reveal on scroll
   ========================================================================== */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .75s var(--ease), transform .75s var(--ease);
}
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover, .mail:hover svg, .brand:hover .brand-mark { transform: none; }
}