:root {
  --primary: #2a4fd7;
  --primary-soft: #e4ebff;
  --ink: #141820;
  --muted: #5c6370;
  --bg: #f3f1ed;
  --paper: #f7f6f3;
  --card: #ffffff;
  --line: #e0dcd4;
  --danger: #b42318;
  --radius: 1.25rem;
  --shadow: 0 18px 50px rgba(20, 24, 32, 0.08);
  --max: 68rem;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #e4ebff 0%, transparent 55%),
    var(--bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Helvetica Neue", "Noto Sans", "Noto Sans Devanagari", "Kohinoor Devanagari",
    "Noto Sans Bengali", "Kohinoor Bangla", "PingFang SC", "Hiragino Sans GB",
    "Noto Sans SC", "Noto Sans TC", sans-serif;
  line-height: 1.5;
  letter-spacing: -0.01em;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.wrap { width: min(var(--max), calc(100% - 2rem)); margin-inline: auto; }
.top {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 86%, white);
  border-bottom: 1px solid var(--line);
}
.top-inner {
  display: flex; align-items: center; gap: 1rem;
  min-height: 4rem;
}
.skip {
  position: absolute; left: 1rem; top: -4rem;
  background: var(--ink); color: white; padding: 0.5rem 0.8rem; border-radius: 0.5rem;
  z-index: 40;
}
.skip:focus { top: 0.6rem; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.brand {
  display: flex; align-items: center; gap: 0.7rem;
  color: var(--ink); font-weight: 700; letter-spacing: -0.03em;
  text-decoration: none;
}
.brand img { width: 2rem; height: 2rem; border-radius: 0.65rem; }
.nav { display: flex; gap: 1.1rem; margin-left: auto; font-size: 0.95rem; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--ink); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.lang {
  display: flex; align-items: center; padding: 0.2rem;
  background: var(--paper); border: 1px solid var(--line); border-radius: 999px;
}
.lang select {
  appearance: none;
  border: 0;
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  padding: 0.35rem 1.85rem 0.35rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  background-color: white;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%235c6370' d='M1.4 1.2 L6 5.8 L10.6 1.2' stroke='%235c6370' stroke-width='1.2' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  background-size: 0.7rem;
  min-width: 8.5rem;
  max-width: 12rem;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 0.5rem; border-radius: 999px; padding: 0.8rem 1.2rem;
  font-weight: 650; text-decoration: none; border: 1px solid transparent;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { text-decoration: none; filter: brightness(1.05); }
.btn-ghost { background: white; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { text-decoration: none; background: var(--paper); }
.hero {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 3rem;
  align-items: center; padding: 4.5rem 0 3rem;
}
.hero > div { min-width: 0; }
.kicker {
  color: var(--primary); font-weight: 700; font-size: 0.85rem;
  letter-spacing: 0.08em; text-transform: uppercase;
}
html:lang(vi) h1 { letter-spacing: 0; }
html:lang(vi) .kicker {
  text-transform: none;
  letter-spacing: 0.04em;
}
h1 {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  line-height: 1.05; letter-spacing: -0.045em; margin: 0.4rem 0 1rem;
  text-wrap: balance;
}
.lede { font-size: 1.2rem; color: var(--muted); max-width: 36rem; }
.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.6rem; }
.meta { margin-top: 1.2rem; color: var(--muted); font-size: 0.92rem; }
.phone {
  justify-self: center; width: min(22rem, 100%);
  min-width: 0;
  background: #101218; border-radius: 2rem; padding: 0.7rem;
  box-shadow: var(--shadow);
}
.phone img { width: 100%; height: auto; border-radius: 1.5rem; }
.section { padding: 3.5rem 0; }
.section h2 {
  font-size: 2rem; letter-spacing: -0.04em; margin: 0 0 1.5rem;
}
.grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem;
}
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.35rem 1.4rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.card p { margin: 0; color: var(--muted); }
.shots {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.9rem;
}
.shots img { width: 100%; height: auto; }
.shots figure {
  margin: 0; background: white; border: 1px solid var(--line);
  border-radius: 1.2rem; overflow: hidden;
}
.shots figcaption {
  padding: 0.7rem 0.8rem 0.9rem; color: var(--muted); font-size: 0.88rem;
}
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.section, .hero { scroll-margin-top: 5.5rem; }
.num {
  width: 2rem; height: 2rem; border-radius: 999px; display: grid; place-items: center;
  background: var(--primary-soft); color: var(--primary); font-weight: 700; margin-bottom: 0.7rem;
}
.limits li { margin: 0.4rem 0; color: var(--muted); }
.langs { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  background: white; border: 1px solid var(--line); border-radius: 999px;
  padding: 0.35rem 0.75rem; font-size: 0.92rem;
}
.faq details {
  background: white; border: 1px solid var(--line); border-radius: 1rem;
  padding: 0.9rem 1.1rem; margin: 0.6rem 0;
}
.faq summary { cursor: pointer; font-weight: 650; }
.faq p { color: var(--muted); margin: 0.6rem 0 0; }
.foot {
  border-top: 1px solid var(--line); padding: 2rem 0 3rem;
  color: var(--muted); font-size: 0.92rem;
}
.foot-row { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }
.policy { max-width: 44rem; padding: 3rem 0 5rem; }
.policy h1 { font-size: 2.4rem; }
.policy h2 { font-size: 1.2rem; margin-top: 2rem; }
.policy .muted { color: var(--muted); }
.policy ul { padding-left: 1.2rem; color: var(--muted); }
@media (max-width: 860px) {
  .hero, .grid, .shots, .steps { grid-template-columns: 1fr; }
  .shots { grid-template-columns: 1fr 1fr; }
  .hero { padding-top: 2.2rem; }
  .top-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand play"
      "lang lang"
      "nav nav";
    align-items: center;
    column-gap: 0.6rem;
    row-gap: 0.4rem;
    padding: 0.7rem 0 0.55rem;
  }
  .brand { grid-area: brand; min-width: 0; }
  .lang { grid-area: lang; justify-self: start; }
  .top-inner > .btn { grid-area: play; padding: 0.45rem 0.8rem; font-size: 0.85rem; white-space: nowrap; }
  .nav {
    grid-area: nav; display: flex; margin: 0;
    gap: 0.9rem; overflow-x: auto; font-size: 0.88rem;
    padding-bottom: 0.15rem;
  }
  .section, .hero { scroll-margin-top: 8.5rem; }
}
@media (max-width: 560px) {
  .shots { grid-template-columns: 1fr; }
  .lang select { min-width: 0; max-width: 11rem; font-size: 0.85rem; padding: 0.3rem 1.7rem 0.3rem 0.65rem; }
  .brand { font-size: 0.95rem; }
}