:root {
  --bg: #05080d;
  --bg-elevated: #0a1018;
  --panel: rgba(12, 18, 28, 0.72);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(127, 211, 255, 0.22);
  --text: #eef3f9;
  --muted: #94a3b8;
  --accent: #7fd3ff;
  --accent-soft: rgba(127, 211, 255, 0.14);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max: 1160px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(900px 520px at 12% -8%, rgba(127, 211, 255, 0.12), transparent 55%),
    radial-gradient(700px 400px at 88% 20%, rgba(99, 102, 241, 0.06), transparent 50%),
    linear-gradient(180deg, #05080d, #030509 60%);
  z-index: -2;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
}

.i18n-en {
  display: none !important;
}

html[lang="en"] .i18n-vi {
  display: none !important;
}

html[lang="en"] .i18n-en {
  display: block !important;
}

html[lang="en"] .i18n-en.i18n-inline,
html[lang="en"] a .i18n-en {
  display: inline !important;
}

html[lang="vi"] a .i18n-vi {
  display: inline !important;
}

/* Keep flex/grid layouts for bilingual wrappers */
html[lang="vi"] .pillars.i18n-vi,
html[lang="en"] .pillars.i18n-en {
  display: grid !important;
}

html[lang="vi"] .pills.i18n-vi,
html[lang="en"] .pills.i18n-en {
  display: flex !important;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  padding: 8px 14px;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
  z-index: 100;
}

.skip-link:focus {
  left: 12px;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 18px 100px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(16px);
  background: linear-gradient(180deg, rgba(5, 8, 13, 0.92), rgba(5, 8, 13, 0.75));
  border-bottom: 1px solid var(--line);
}

.site-header .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.wordmark {
  font-weight: 800;
  letter-spacing: -0.03em;
  font-size: 1.05rem;
}

.sublabel {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-desktop a {
  padding: 8px 11px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  border: 1px solid transparent;
}

.nav-desktop a:hover {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.account-state {
  display: flex;
  align-items: center;
  gap: 8px;
}

.account-state .welcome {
  font-size: 12px;
  color: var(--muted);
  padding: 0 4px;
}

.lang-switch {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.lang-switch button {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 7px 11px;
  font-size: 12px;
  cursor: pointer;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--text);
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
  color: var(--text);
}

.btn:hover {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.06);
}

.btn.primary {
  border-color: var(--line-strong);
  background: var(--accent-soft);
  color: var(--text);
}

.btn.ghost {
  background: transparent;
}

.menu-toggle {
  display: flex;
  border-radius: var(--radius-sm);
}

@media (min-width: 1040px) {
  .nav-desktop {
    display: flex;
  }
  .menu-toggle {
    display: none;
  }
}

/* Mobile drawer */
.nav-drawer {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
}

.nav-drawer.open {
  pointer-events: auto;
}

.nav-drawer .backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  opacity: 0;
  transition: opacity 0.2s;
}

.nav-drawer.open .backdrop {
  opacity: 1;
}

.nav-drawer .panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(100%, 320px);
  height: 100%;
  background: var(--bg-elevated);
  border-left: 1px solid var(--line);
  padding: 20px;
  transform: translateX(100%);
  transition: transform 0.22s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-drawer.open .panel {
  transform: translateX(0);
}

.nav-drawer a,
.nav-drawer button.full {
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
}

/* Hero */
.hero {
  margin-top: 28px;
  padding: clamp(24px, 4vw, 40px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(14, 22, 36, 0.95), rgba(8, 12, 20, 0.88));
  box-shadow: var(--shadow);
  display: grid;
  gap: 28px;
}

@media (min-width: 960px) {
  .hero {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

.eyebrow {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  font-weight: 700;
  margin: 0 0 12px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.55rem, 3.6vw, 2.45rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
}

.hero .lead {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  max-width: 52ch;
  line-height: 1.75;
}

.hero-ctas {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.pill {
  font-size: 11px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
}

.hero-visual {
  position: relative;
  min-height: 220px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: radial-gradient(circle at 30% 30%, rgba(127, 211, 255, 0.15), transparent 50%),
    linear-gradient(160deg, rgba(255, 255, 255, 0.04), transparent);
  overflow: hidden;
}

.hero-visual .grid-bg {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.5;
}

.node {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 20px rgba(127, 211, 255, 0.5);
  animation: pulse 4s ease-in-out infinite;
}

.node.n1 {
  top: 28%;
  left: 22%;
  animation-delay: 0s;
}
.node.n2 {
  top: 52%;
  left: 48%;
  animation-delay: 0.6s;
}
.node.n3 {
  top: 36%;
  right: 24%;
  animation-delay: 1.2s;
}
.node.n4 {
  bottom: 22%;
  left: 36%;
  animation-delay: 1.8s;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.55;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.15);
  }
}

.svg-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.35;
}

/* Sections */
section.section {
  margin-top: clamp(48px, 7vw, 88px);
}

.section-head {
  max-width: 720px;
  margin-bottom: 28px;
}

.section-head h2 {
  margin: 0 0 12px;
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.card-grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 640px) {
  .card-grid.cols-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .card-grid.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .card-grid.cols-6 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid.cols-6 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(12px);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.7;
}

.card .meta {
  margin-top: 10px;
  font-size: 11px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.dynamic-empty {
  color: var(--muted);
  font-size: 14px;
}

.card-footer {
  margin-top: 14px;
}

.badge {
  display: inline-block;
  font-size: 10px;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid var(--line);
  color: var(--muted);
  margin-right: 6px;
  margin-bottom: 6px;
}

.flagship {
  border-color: var(--line-strong);
  background: linear-gradient(145deg, rgba(127, 211, 255, 0.08), rgba(12, 18, 28, 0.85));
}

.pillars {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

@media (min-width: 720px) {
  .pillars {
    grid-template-columns: repeat(5, 1fr);
  }
}

.pillar {
  font-size: 12px;
  color: var(--muted);
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

@media (max-width: 719px) {
  .pillars {
    grid-template-columns: 1fr 1fr;
  }
}

.path-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 800px) {
  .path-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .path-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.cta-band {
  margin-top: clamp(56px, 8vw, 96px);
  padding: clamp(28px, 5vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: linear-gradient(120deg, rgba(127, 211, 255, 0.1), rgba(12, 18, 28, 0.9));
  text-align: center;
}

.cta-band h2 {
  margin: 0 0 10px;
}

.cta-band p {
  margin: 0 auto 20px;
  max-width: 52ch;
  color: var(--muted);
}

/* Newsletter */
.newsletter {
  margin-top: 48px;
  padding: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.newsletter form {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  align-items: center;
}

.newsletter input[type="email"] {
  flex: 1 1 220px;
  min-width: 0;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  font-size: 15px;
}

.newsletter .form-msg {
  width: 100%;
  font-size: 13px;
  margin-top: 8px;
  min-height: 1.2em;
}

.newsletter .form-msg.ok {
  color: var(--accent);
}

.newsletter .form-msg.err {
  color: #fca5a5;
}

/* Footer */
.site-footer {
  margin-top: 64px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  gap: 28px;
}

@media (min-width: 900px) {
  .footer-grid {
    grid-template-columns: 1.2fr repeat(4, 1fr);
  }
}

.footer-col h3 {
  margin: 0 0 12px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--muted);
  font-size: 14px;
}

.footer-col a:hover {
  color: var(--text);
}

.footer-brand p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
  max-width: 36ch;
}

.footer-bottom {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 899px) {
  .footer-col h3 {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .footer-col h3::after {
    content: "+";
    opacity: 0.5;
  }
  .footer-col.collapsed ul {
    display: none;
  }
}

/* Hero mobile: slightly tighter */
@media (max-width: 599px) {
  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-ctas .btn {
    width: 100%;
  }
}