:root {
  --bg: #0b0c10;
  --panel: #111218;
  --text: #e8ebef;
  --muted: #b7c0cc;
  --primary: #6aa4ff;
  --primary-700: #3e7be6;
  --success: #22c55e;

  --radius: 12px;
  --shadow: 0 8px 30px rgba(0,0,0,0.25);

  --step--2: clamp(0.78rem, 0.76rem + 0.1vw, 0.88rem);
  --step--1: clamp(0.89rem, 0.85rem + 0.2vw, 1.02rem);
  --step-0: clamp(1rem, 0.95rem + 0.4vw, 1.15rem);
  --step-1: clamp(1.2rem, 1.05rem + 0.8vw, 1.44rem);
  --step-2: clamp(1.44rem, 1.2rem + 1.4vw, 1.8rem);
  --step-3: clamp(1.8rem, 1.45rem + 2.2vw, 2.4rem);
  --step-4: clamp(2.2rem, 1.7rem + 3.2vw, 3rem);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: linear-gradient(180deg, var(--bg), #0f1117 40%, #141827);
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--text); text-decoration: none; }
p { color: var(--muted); line-height: 1.6; font-size: var(--step-0); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5rem; }
h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }
.small { font-size: var(--step--1); color: var(--muted); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Header */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem clamp(1rem, 2vw, 2rem);
  position: sticky; top: 0; background: rgba(11,12,16,0.7); backdrop-filter: blur(6px); z-index: 50;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.logo { font-weight: 700; letter-spacing: 0.3px; }
.nav { display: none; gap: 1rem; align-items: center; }
.nav a { color: var(--muted); }
.nav a.btn { color: white; }
.nav-toggle { background: transparent; color: var(--text); border: 1px solid rgba(255,255,255,0.15); border-radius: 8px; padding: 0.4rem 0.6rem; }
@media (min-width: 900px) {
  .nav { display: flex; }
  .nav-toggle { display: none; }
}

/* Hero */
.section-hero {
  display: grid; gap: 2rem; align-items: center;
  grid-template-columns: 1fr; padding: 4rem 1.25rem 2rem; max-width: 1200px; margin: 0 auto;
}
.hero-content { max-width: 640px; }
.hero-subtitle { margin: 0.75rem 0 1.25rem; }
.hero-media { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }

.cta-form { display: grid; grid-template-columns: 1fr; gap: 0.75rem; max-width: 520px; }
.cta-form input {
  background: var(--panel); border: 1px solid rgba(255,255,255,0.08); color: var(--text);
  padding: 0.9rem 1rem; border-radius: 10px; outline: none;
}
.cta-form input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(106,164,255,0.25); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.9rem 1.1rem; border-radius: 10px; font-weight: 600; cursor: pointer; transition: transform 0.04s ease, background 0.2s ease;
  border: 1px solid transparent;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: #08111f; border-color: transparent; }
.btn-primary:hover { background: var(--primary-700); color: white; }
.btn-sm { padding: 0.55rem 0.8rem; font-size: var(--step--1); }

.trust-hints { margin-top: 0.5rem; }

/* Sections */
.section { padding: 3rem 1.25rem; max-width: 1200px; margin: 0 auto; }
.section-features .grid-3 {
  display: grid; gap: 1rem; grid-template-columns: 1fr;
}
.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 1.25rem;
}
@media (min-width: 800px) {
  .section-hero { grid-template-columns: 1.1fr 0.9fr; }
  .section-features .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .section-detail { grid-template-columns: 1.1fr 0.9fr; display: grid; gap: 2rem; align-items: center; }
}

/* Proof */
.section-proof .logo-row {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; list-style: none; padding: 0; margin: 1rem 0 2rem;
}
.section-proof .testimonials {
  display: grid; gap: 1rem; grid-template-columns: 1fr;
}
.testimonial {
  padding: 1rem 1.25rem; background: rgba(255,255,255,0.03); border-radius: var(--radius); border: 1px solid rgba(255,255,255,0.06);
}
@media (min-width: 800px) {
  .section-proof .logo-row { grid-template-columns: repeat(4, 1fr); }
  .section-proof .testimonials { grid-template-columns: repeat(2, 1fr); }
}

/* Detail */
.section-detail .checklist { margin: 1rem 0 1.25rem; padding-left: 1.2rem; }
.section-detail .checklist li { margin: 0.35rem 0; }

/* FAQ */
.section-faq details {
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius); padding: 0.85rem 1rem; margin-bottom: 0.75rem;
}
.section-faq summary { cursor: pointer; font-weight: 600; }

/* CTA band */
.section-cta {
  text-align: center; padding: 4rem 1.25rem; background: radial-gradient(1200px 400px at 50% 0%, rgba(106,164,255,0.12), transparent 60%);
}

/* Footer */
.site-footer {
  display: flex; gap: 1rem; justify-content: space-between; align-items: center; padding: 1.25rem; max-width: 1200px; margin: 0 auto;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.site-footer nav a { color: var(--muted); margin-right: 0.75rem; }