:root {
  color-scheme: light dark;
  --bg: #f6f4fb;
  --surface: #ffffff;
  --text: #1c1826;
  --muted: #625b72;
  --accent: #7c3aed;
  --accent-soft: #ede7fd;
  --border: rgba(28, 24, 38, 0.1);
  --shadow: 0 18px 50px rgba(67, 32, 130, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #130f1d;
    --surface: #1d1729;
    --text: #f4f0ff;
    --muted: #b7aecb;
    --accent: #b794ff;
    --accent-soft: #2b2140;
    --border: rgba(255, 255, 255, 0.1);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  padding: 28px 0 10px;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.15rem;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(67, 32, 130, 0.18);
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
}

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

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

.hero {
  padding: 64px 0 44px;
}

.hero .wrap {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: center;
}

.hero-icon {
  width: 112px;
  height: 112px;
  border-radius: 26px;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(2.4rem, 8vw, 4rem);
  letter-spacing: -0.045em;
  line-height: 1;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1.15rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}

.button.secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.button:hover {
  opacity: 0.9;
}

.content {
  padding: 12px 0 72px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: clamp(24px, 5vw, 44px);
  box-shadow: var(--shadow);
}

.card + .card {
  margin-top: 20px;
}

.card h1 {
  margin-top: 0;
  font-size: clamp(2rem, 6vw, 2.8rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.card h2 {
  margin-top: 2em;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.card h3 {
  margin-top: 1.5em;
  font-size: 1.05rem;
}

.card p,
.card li {
  color: var(--text);
}

.card ul {
  padding-left: 1.2em;
}

.card li + li {
  margin-top: 0.45em;
}

.muted {
  color: var(--muted);
}

.effective {
  color: var(--muted);
  font-size: 0.95rem;
}

.callout {
  background: var(--accent-soft);
  border-radius: 16px;
  padding: 18px 20px;
  margin: 24px 0;
}

.faq {
  margin: 0;
}

.faq dt {
  font-weight: 700;
  margin-top: 1.4em;
}

.faq dd {
  margin: 0.35em 0 0;
  color: var(--muted);
}

footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 0.9rem;
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  justify-content: space-between;
}

footer a {
  color: var(--muted);
}

footer a:hover {
  color: var(--accent);
}

@media (max-width: 620px) {
  .site-header .wrap {
    align-items: flex-start;
  }

  .hero {
    padding-top: 40px;
  }

  .hero .wrap {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero-icon {
    width: 88px;
    height: 88px;
    border-radius: 21px;
  }
}