:root {
  color-scheme: light dark;
  --bg: #f7f8f6;
  --panel: #ffffff;
  --text: #17201b;
  --muted: #5f6c64;
  --line: #d9ded8;
  --accent: #0f766e;
  --accent-strong: #0b4f4a;
  --soft: #e8f3f1;
  --warning: #f8efe2;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101513;
    --panel: #18211e;
    --text: #f0f5f1;
    --muted: #a9b6ae;
    --line: #2c3834;
    --accent: #5eead4;
    --accent-strong: #99f6e4;
    --soft: #142c28;
    --warning: #31271d;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.wrap {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  position: sticky;
  top: 0;
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

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

.links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.links a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}

.hero {
  padding: 76px 0 56px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 5.4rem);
  line-height: 0.98;
  margin: 0 0 24px;
  letter-spacing: 0;
}

.lede {
  font-size: clamp(1.08rem, 2vw, 1.28rem);
  color: var(--muted);
  max-width: 680px;
}

.price {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 26px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  font-weight: 700;
}

.app-visual {
  display: grid;
  justify-items: center;
  gap: 18px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.app-visual img {
  width: min(220px, 60vw);
  height: min(220px, 60vw);
  border-radius: 42px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 34px 0;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: var(--panel);
}

.card h2,
.card h3 {
  margin: 0 0 10px;
  line-height: 1.2;
}

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

.section {
  padding: 38px 0;
}

.section h2 {
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  margin: 0 0 14px;
  letter-spacing: 0;
}

.prose {
  max-width: 820px;
  padding: 44px 0 64px;
}

.prose h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.05;
  margin: 0 0 18px;
  letter-spacing: 0;
}

.prose h2 {
  margin-top: 34px;
  line-height: 1.2;
}

.prose p,
.prose li {
  color: var(--muted);
}

.notice {
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  margin: 24px 0;
}

.warning {
  background: var(--warning);
}

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 42px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 46px;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}