:root {
  --c: #1565c0;
  --c-dark: #0d47a1;
  --ink: #102a43;
  --muted: #52606d;
  --line: #e4e7eb;
  --bg: #f5f8fc;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: #ffffff;
  line-height: 1.6;
}

a {
  color: var(--c);
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

header.top {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

header.top .wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 18px;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.brand small {
  display: block;
  font-weight: 400;
  font-size: 11.5px;
  color: var(--muted);
  line-height: 1.1;
}

nav {
  margin-left: auto;
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: 14.5px;
}

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

nav a:hover {
  color: var(--c);
}

.lang-switch button {
  border: 1px solid var(--line);
  background: #ffffff;
  padding: 4px 9px;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
}

.lang-switch button.on {
  background: var(--c);
  border-color: var(--c);
  color: #ffffff;
}

.hero {
  background: linear-gradient(180deg, #eaf2fd, #ffffff);
  padding: 64px 0 40px;
}

.hero .wrap {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.15;
  margin: 0 0 16px;
  color: var(--c-dark);
}

.hero p.lead {
  font-size: 19px;
  color: var(--muted);
  margin: 0 0 24px;
}

.hero img.shot {
  width: 100%;
  border-radius: 14px;
  box-shadow: 0 18px 50px rgba(13, 71, 161, 0.18);
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 9px;
  font-weight: 600;
  text-decoration: none;
  margin: 0 8px 8px 0;
}

.btn.primary {
  background: var(--c);
  color: #ffffff;
}

.btn.primary:hover {
  background: var(--c-dark);
}

.btn.ghost {
  border: 1px solid var(--c);
  color: var(--c);
}

section {
  padding: 56px 0;
}

section h2 {
  font-size: 30px;
  margin: 0 0 24px;
  text-align: center;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  background: #ffffff;
}

.feature b {
  display: block;
  font-size: 17px;
  margin-bottom: 6px;
}

.feature span {
  color: var(--muted);
  font-size: 15px;
}

.alt {
  background: var(--bg);
}

.shots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.shots img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--line);
}

.pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.plan {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
  background: #ffffff;
  text-align: center;
}

.plan.best {
  border: 2px solid var(--c);
  box-shadow: 0 10px 30px rgba(21, 101, 192, 0.12);
}

.plan .price {
  font-size: 34px;
  font-weight: 700;
  color: var(--c-dark);
  margin: 8px 0;
}

.plan ul {
  text-align: left;
  padding-left: 18px;
  color: var(--muted);
  font-size: 15px;
}

.doc {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

.doc h1 {
  color: var(--c-dark);
}

.doc h2 {
  font-size: 21px;
  margin-top: 28px;
}

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  color: var(--muted);
  font-size: 13.5px;
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
}

[data-lang] {
  display: none;
}

html[lang="en"] [data-lang="en"],
html[lang="vi"] [data-lang="vi"] {
  display: revert;
}

@media (max-width: 820px) {
  .hero .wrap,
  .features,
  .shots,
  .pricing {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 34px;
  }

  nav .hide-sm {
    display: none;
  }
}