:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --muted: #6b7280;
  --accent: #0071e3;
  --accent-dark: #0058b0;
  --card: #f5f5f7;
  --border: #e5e5ea;
  --radius: 12px;
  --max: 1100px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
}
.logo {
  font-weight: 600;
  font-size: 17px;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.nav nav a {
  margin-left: 22px;
  color: var(--fg);
  font-size: 15px;
}
.nav nav a:hover { color: var(--accent); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 500;
  font-size: 15px;
  transition: all 0.15s ease;
  border: none;
  cursor: pointer;
}
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--card); }

/* Hero */
.hero {
  padding: 110px 0 90px;
  text-align: center;
  background: linear-gradient(180deg, #fbfbfd 0%, #fff 100%);
}
.hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: 0 0 20px;
}
.hero .lead {
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto 36px;
}
.cta-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Sections */
section { padding: 90px 0; }
section h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 48px;
  text-align: center;
}

/* Features grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px;
}
.card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

/* How it works */
.how { background: #fbfbfd; }
.steps {
  list-style: none;
  padding: 0;
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.steps li {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  background: #fff;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.step-num {
  flex: 0 0 40px;
  height: 40px;
  width: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 17px;
}
.steps h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 600;
}
.steps p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}
.steps code {
  background: var(--card);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 14px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

/* Get section */
.get {
  text-align: center;
  background: linear-gradient(180deg, #fff 0%, #fbfbfd 100%);
}
.get .lead {
  color: var(--muted);
  max-width: 540px;
  margin: 0 auto 28px;
  font-size: 18px;
}
.signup {
  display: flex;
  gap: 10px;
  justify-content: center;
  max-width: 460px;
  margin: 0 auto 16px;
  flex-wrap: wrap;
}
.signup input {
  flex: 1 1 240px;
  padding: 12px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s ease;
}
.signup input:focus { border-color: var(--accent); }
.small { color: var(--muted); font-size: 14px; }

/* Footer */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 600px) {
  .nav nav a { margin-left: 12px; font-size: 14px; }
  section { padding: 60px 0; }
  .hero { padding: 70px 0 60px; }
}