@font-face {
  font-family: "Outfit";
  src: url("../fonts/Outfit-Variable.ttf") format("truetype");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #070b14;
  --bg-elev: #0d1524;
  --bg-tint: #102033;
  --text: #e6eef8;
  --muted: #8b9bb0;
  --accent: #4ad4f0;
  --accent-deep: #1a6f82;
  --line: rgba(74, 212, 240, 0.18);
  --warn: #f3c77a;
  --warn-bg: rgba(243, 199, 122, 0.08);
  --radius: 12px;
  --nav-h: 64px;
  --ease: cubic-bezier(0.32, 0.72, 0, 1);
}

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

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--text);
  background: var(--bg);
  font-family: "Outfit", "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 80% -10%, rgba(74, 212, 240, 0.14), transparent 55%),
    radial-gradient(ellipse 50% 40% at 10% 110%, rgba(26, 111, 130, 0.18), transparent 50%);
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip:focus {
  left: 16px;
  z-index: 40;
  background: var(--bg-elev);
  padding: 8px 12px;
  border-radius: 8px;
}

.nav {
  position: sticky;
  top: 12px;
  z-index: 20;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 12px auto 0;
  width: min(1120px, calc(100% - 40px));
  padding: 0 14px 0 10px;
  background: rgba(7, 11, 20, 0.72);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

@media (prefers-reduced-transparency: reduce) {
  .nav {
    background: var(--bg-elev);
    backdrop-filter: none;
  }
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}

.lang {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.lang button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 600 12px/1 "Outfit", sans-serif;
  padding: 8px 10px;
  cursor: pointer;
}

.lang button[aria-pressed="true"] {
  background: var(--accent);
  color: #062028;
}

.hero {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  min-height: calc(100dvh - 96px);
  padding: 48px 0 72px;
}

.kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

h1,
h2,
.display {
  font-family: "Outfit", "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(2.4rem, 5vw, 4.2rem);
}

.lede {
  margin: 0 0 28px;
  max-width: 42ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 200ms var(--ease), background 200ms var(--ease);
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--accent);
  color: #062028;
}

.btn-primary:hover {
  background: #7ee4f5;
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
}

.btn-ghost:hover {
  background: var(--bg-elev);
}

.hero-visual {
  position: relative;
  padding: 10px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.hero-core {
  border-radius: 14px;
  overflow: hidden;
  background: #041018;
  border: 1px solid var(--line);
}

.hero-core img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}

.ticks {
  display: flex;
  justify-content: space-between;
  padding: 10px 16px 14px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

section {
  position: relative;
  z-index: 1;
  padding: 88px 0;
}

.section-title {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.section-copy {
  margin: 0 0 40px;
  max-width: 58ch;
  color: var(--muted);
}

.bento {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 14px;
}

.tile {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev);
}

.tile.wide {
  grid-column: 1;
  grid-row: 1 / span 2;
  background:
    linear-gradient(180deg, rgba(74, 212, 240, 0.08), transparent 42%),
    var(--bg-tint);
}

.tile h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.tile p {
  margin: 0;
  color: var(--muted);
}

.flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  counter-reset: none;
}

.flow article h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.flow article p {
  margin: 0;
  color: var(--muted);
}

.safety {
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid rgba(243, 199, 122, 0.28);
  background: var(--warn-bg);
}

.safety h2 {
  color: var(--warn);
  margin: 0 0 12px;
  font-size: 1.5rem;
}

.safety p {
  margin: 0;
  max-width: 70ch;
}

.testers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.stat {
  font-family: "Outfit", sans-serif;
  font-weight: 700;
  font-size: 4rem;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--accent);
}

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

footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  padding: 36px 0 48px;
}

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}

.foot nav {
  display: flex;
  gap: 18px;
}

.doc {
  position: relative;
  z-index: 1;
  padding: 56px 0 96px;
}

.doc-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 8px;
}

.updated {
  color: var(--muted);
  margin: 0 0 40px;
  font-size: 14px;
}

.legal {
  max-width: 72ch;
}

.legal h2 {
  margin: 36px 0 10px;
  font-size: 1.25rem;
}

.legal p,
.legal li {
  color: #c5d0de;
}

.legal ul {
  padding-left: 1.2em;
}

.reveal {
  animation: rise 700ms var(--ease) both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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

  .reveal,
  .btn {
    animation: none;
    transition: none;
  }
}

@media (max-width: 860px) {
  .nav-links a:not(.keep) {
    display: none;
  }

  .hero,
  .bento,
  .flow,
  .testers {
    grid-template-columns: 1fr;
  }

  .tile.wide {
    grid-column: auto;
    grid-row: auto;
  }

  .hero {
    min-height: unset;
    padding-top: 36px;
  }

  section {
    padding: 64px 0;
  }
}