:root {
  --bg: #ffffff;
  --bg-soft: #fbfbfd;
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --hairline: #e6e6e9;
  --accent: #6e56cf; 
  --maxw: 760px;
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
    Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* ── Sticky nav ─────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.wordmark {
  color: var(--ink);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.wordmark:hover {
  text-decoration: none;
}
.nav-links {
  display: flex;
  gap: 22px;
}
.nav-links a {
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
}
.nav-links a:hover {
  color: var(--ink);
  text-decoration: none;
}

/* ── Layout ─────────────────────────────────────────────────── */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 72px 0;
  border-top: 1px solid var(--hairline);
  scroll-margin-top: 80px;
}

h1,
h2,
h3 {
  letter-spacing: -0.02em;
  color: var(--ink);
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  padding: 96px 0 80px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 68px);
  line-height: 1.05;
  font-weight: 700;
  margin: 0 0 20px;
}
.hero-sub {
  max-width: 540px;
  margin: 0 auto;
  font-size: 19px;
  color: var(--ink-soft);
}

/* ── Sections ───────────────────────────────────────────────── */
.section h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  margin: 0 0 20px;
}
.section h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 32px 0 8px;
}
.section p {
  font-size: 17px;
  margin: 0 0 16px;
}

#about p {
  color: var(--ink-soft);
}
#about p strong {
  color: var(--ink);
}

/* feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 40px;
}
.feature {
  background: var(--bg-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 22px;
}
.feature h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
}
.feature p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

/* ── Legal blocks ───────────────────────────────────────────── */
.legal .updated {
  color: var(--ink-soft);
  font-size: 14px;
  margin-top: -8px;
  margin-bottom: 28px;
}
.legal p,
.legal li {
  font-size: 16px;
  color: #3a3a3c;
}
.legal ul {
  padding-left: 20px;
  margin: 8px 0 16px;
}
.legal li {
  margin-bottom: 8px;
}
.legal strong {
  color: var(--ink);
}
.placeholder {
  color: #b00020;
  font-weight: 500;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--hairline);
  text-align: center;
  padding: 56px 24px 72px;
  color: var(--ink-soft);
}
.footer-mark {
  font-weight: 700;
  color: var(--ink);
  font-size: 17px;
  margin: 0 0 8px;
}
.footer p {
  margin: 4px 0;
  font-size: 14px;
}
.footer-fine {
  color: #a1a1a6;
  margin-top: 18px;
}

@media (max-width: 540px) {
  .nav-links {
    gap: 16px;
  }
  .section {
    padding: 56px 0;
  }
}