:root {
  --bg: oklch(98% 0.01 85);
  --ink: oklch(23% 0.03 280);
  --paper: oklch(100% 0.005 80);
  --hot: oklch(68% 0.22 28);
  --candy: oklch(75% 0.18 345);
  --mint: oklch(86% 0.14 165);
  --line: oklch(82% 0.03 70);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, oklch(94% 0.08 45), transparent 35%),
    radial-gradient(circle at 85% 12%, oklch(94% 0.09 325), transparent 32%),
    var(--bg);
  line-height: 1.7;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 6vw;
  background: color-mix(in oklab, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.logo {
  font-family: "ZCOOL KuaiLe", cursive;
  font-size: 1.5rem;
}

nav {
  display: flex;
  gap: 1.3rem;
}

nav a {
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
}

main {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.hero {
  min-height: 70vh;
  display: grid;
  align-content: center;
  gap: 1rem;
  padding: 5rem 0 3rem;
}

.kicker {
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--hot);
}

h1 {
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 5.4rem);
  line-height: 1.05;
  max-width: 11ch;
}

.hero p {
  max-width: 54ch;
  margin: 0;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.15rem;
  border-radius: 0.8rem;
  text-decoration: none;
  font-weight: 700;
}

.btn.solid {
  background: var(--ink);
  color: var(--paper);
}

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

.section {
  padding: 3rem 0;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.8rem);
  margin: 0 0 1rem;
}

h3 {
  margin-top: 0;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.intro-grid article,
.download-grid article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.2rem;
}

ul {
  margin: 0;
  padding-left: 1.2rem;
}

.feature-strip {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 0.8rem;
}

.feature-strip article {
  background: linear-gradient(140deg, color-mix(in oklab, var(--mint) 35%, var(--paper)), var(--paper));
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 1rem;
}

.feature-strip span {
  font-weight: 900;
  color: var(--hot);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}

.store-links {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.qr {
  width: min(220px, 100%);
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 0.8rem;
  border: 1px solid var(--line);
  background: var(--paper);
}

.company p {
  max-width: 70ch;
}

footer {
  text-align: center;
  padding: 2rem 1rem 2.5rem;
  color: color-mix(in oklab, var(--ink) 75%, var(--paper));
}

@media (max-width: 760px) {
  .topbar {
    padding: 0.9rem 4vw;
    flex-direction: column;
    gap: 0.55rem;
  }

  nav {
    gap: 0.8rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    min-height: auto;
    padding-top: 3.5rem;
  }
}