:root {
  --bg: oklch(98% 0.006 120);
  --text: oklch(22% 0.02 250);
  --text-muted: oklch(48% 0.02 250);
  --text-muted-2: oklch(40% 0.02 250);
  --text-muted-3: oklch(38% 0.02 250);
  --green: oklch(45% 0.15 152);
  --green-hover: oklch(38% 0.16 152);
  --green-soft-bg: oklch(93% 0.06 152);
  --green-dot: oklch(60% 0.18 152);
  --border: oklch(90% 0.01 120);
  --border-soft: oklch(92% 0.01 120);
  --dark: oklch(15% 0.01 250);
  --dark-hover: oklch(25% 0.01 250);
  --dark-bg: oklch(15% 0.02 250);
  --dark-card: oklch(22% 0.02 250);
  --dark-border: oklch(32% 0.02 250);
  --dark-text: oklch(92% 0.01 250);
  --dark-text-sub: oklch(75% 0.02 250);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  font-family: 'Inter', sans-serif;
  color: var(--text);
}

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-hover); }
h1, h2, h3 { font-family: 'Manrope', sans-serif; margin: 0; }
img { max-width: 100%; display: block; }

.page {
  max-width: 1440px;
  margin: 0 auto;
  overflow: hidden;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 48px;
  position: sticky;
  top: 0;
  background: oklch(98% 0.006 120 / 0.9);
  backdrop-filter: blur(8px);
  z-index: 50;
  border-bottom: 1px solid var(--border);
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { width: 48px; height: 48px; border-radius: 10px; object-fit: cover; }
.brand-name {
  font-family: 'Manrope', sans-serif;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.3px;
  color: var(--text);
}
.brand-accent { color: var(--green); }

.site-nav { display: flex; gap: 36px; font-weight: 600; font-size: 15px; }
.site-nav a { color: var(--text); }

.header-actions { display: flex; align-items: center; gap: 16px; }

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 14px;
}
.btn-primary { background: var(--green); color: white; }
.btn-primary:hover { background: var(--green-hover); color: white; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 64px 48px 60px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--green-soft-bg);
  color: var(--green-hover);
  padding: 8px 16px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 24px;
}
.eyebrow-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green-dot); }

.hero-copy h1 {
  font-size: 56px;
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 18px;
}

.lede-en { font-size: 16px; color: var(--text-muted); font-weight: 500; margin: 0 0 8px; }
.lede-vi { font-size: 17px; color: var(--text-muted-3); line-height: 1.6; max-width: 480px; margin: 0 0 32px; }

.store-buttons { display: flex; gap: 14px; flex-wrap: wrap; }
.store-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--dark);
  color: white;
  padding: 12px 22px;
  border-radius: 14px;
}
.store-btn:hover { background: var(--dark-hover); color: white; }
.store-btn-text { text-align: left; }
.store-btn-sub { font-size: 10px; opacity: .75; line-height: 1; }
.store-btn-title { font-size: 16px; font-weight: 700; line-height: 1.3; }
.store-btn-lg { padding: 14px 26px; }
.store-btn-lg .store-btn-sub { font-size: 11px; }
.store-btn-lg .store-btn-title { font-size: 17px; }

.stats { display: flex; gap: 28px; margin-top: 36px; }
.stat-num { font-weight: 800; font-size: 22px; font-family: 'Manrope', sans-serif; }
.stat-label { font-size: 13px; color: var(--text-muted); }

.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-glow {
  position: absolute;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, oklch(85% 0.08 152 / 0.7), transparent 70%);
  top: -20px;
}
.phone-frame {
  position: relative;
  width: 280px;
  height: 580px;
  border-radius: 42px;
  background: var(--dark);
  padding: 12px;
  box-shadow: 0 40px 80px -20px oklch(20% 0.02 250 / 0.4);
  animation: float 5s ease-in-out infinite;
}
.phone-screen { width: 100%; height: 100%; border-radius: 32px; overflow: hidden; background: white; }
.phone-screen img { width: 100%; height: 100%; object-fit: cover; }

/* Section heads */
.section-head { text-align: center; max-width: 640px; margin: 0 auto 56px; }
.section-head h2 { font-size: 38px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 12px; }
.section-head p { font-size: 15px; color: var(--text-muted); font-weight: 500; margin: 0; }
.section-head h2.on-dark { color: white; }
.section-head p.on-dark-sub { color: var(--dark-text-sub); }

/* Features */
.features { padding: 80px 48px; background: white; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--bg);
  border-radius: 20px;
  padding: 32px;
  border: 1px solid var(--border-soft);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--green-soft-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.feature-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 6px; }
.feature-en { font-size: 13px; color: var(--text-muted); font-weight: 500; margin: 0 0 10px; }
.feature-desc { font-size: 14.5px; color: var(--text-muted-2); line-height: 1.55; margin: 0; }

/* Screenshots */
.screenshots { padding: 80px 48px; }
.screenshots-row { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.screenshot { width: 220px; margin: 0; }
.screenshot-frame {
  border-radius: 28px;
  background: var(--dark);
  padding: 8px;
  box-shadow: 0 24px 48px -16px oklch(20% 0.02 250 / 0.25);
}
.screenshot-frame img { border-radius: 20px; overflow: hidden; aspect-ratio: 9 / 19.5; width: 100%; object-fit: cover; }
.screenshot figcaption { text-align: center; font-size: 13px; font-weight: 600; margin-top: 14px; color: var(--text-muted-3); }

/* Networks */
.networks { padding: 80px 48px; background: var(--dark-bg); color: white; }
.networks-grid {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 900px;
  margin: 0 auto;
}
.networks-grid span {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 14px;
  padding: 16px 26px;
  font-weight: 700;
  font-size: 15px;
  color: var(--dark-text);
}

/* Download */
.download {
  padding: 96px 48px;
  text-align: center;
  background: linear-gradient(180deg, white, var(--green-soft-bg));
}
.download h2 { font-size: 40px; font-weight: 800; letter-spacing: -0.5px; margin-bottom: 14px; }
.download-en { font-size: 16px; color: var(--text-muted-2); font-weight: 500; margin: 0 0 8px; }
.download-note { font-size: 14px; color: var(--text-muted); margin: 0 0 36px; }
.store-buttons-lg { justify-content: center; margin-bottom: 0; }

/* Footer */
.site-footer {
  padding: 32px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: oklch(55% 0.02 250);
  gap: 12px;
  flex-wrap: wrap;
  text-align: center;
}

/* Responsive */
@media (max-width: 860px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 8px 0;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 14px 48px; }
  .site-nav a:hover { background: var(--border-soft); }
  .nav-toggle { display: flex; }
  .header-cta { display: none; }
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 48px 24px 40px;
    text-align: center;
  }
  .lede-vi { max-width: none; margin-left: auto; margin-right: auto; }
  .eyebrow { margin-left: auto; margin-right: auto; }
  .store-buttons, .stats { justify-content: center; }
  .hero-visual { order: -1; }
  .hero-copy h1 { font-size: 40px; }
  .features, .screenshots, .networks, .download { padding: 56px 24px; }
  .features-grid { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
  .section-head h2 { font-size: 28px; }
  .download h2 { font-size: 28px; }
  .site-header { padding: 14px 20px; }
}

@media (max-width: 480px) {
  .phone-frame { width: 220px; height: 460px; }
  .hero-copy h1 { font-size: 32px; }
  .store-btn { padding: 10px 16px; }
}