:root {
  --bg: #ffffff;
  --text: #111111;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e5e7eb;
  --shadow: 0 1px 3px rgba(0,0,0,.06);
  --shadow-lg: 0 4px 24px rgba(0,0,0,.08);
  --radius: 12px;
  --radius-lg: 16px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

main { overflow-x: hidden; }

section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

@media (min-width: 768px) {
  section { padding: 5rem 2rem; }
}

/* Hero */
.hero {
  display: grid;
  gap: 3rem;
  align-items: center;
  padding-top: 3rem;
  padding-bottom: 4rem;
}

@media (min-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 4rem;
    padding-top: 4rem;
    padding-bottom: 6rem;
  }
}

.hero-content { text-align: center; }

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.875rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.hero-sub {
  margin: 0 auto 1.75rem;
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 36ch;
}

.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--text);
  border: none;
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform .15s, box-shadow .2s;
}

.cta-primary:hover {
  background: #1f2937;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.cta-primary:active { transform: translateY(0); }

.cta-icon { flex-shrink: 0; }

.cta-micro {
  margin: 1rem 0 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.cta-large { padding: 1rem 1.75rem; font-size: 1.0625rem; }

/* Device mockup */
.hero-device {
  position: relative;
  display: flex;
  justify-content: center;
}

.device-glow {
  position: absolute;
  inset: -20% 0;
  background: linear-gradient(135deg, rgba(37,99,235,.08) 0%, transparent 50%);
  border-radius: 50%;
  pointer-events: none;
}

.device-frame {
  position: relative;
  width: 260px;
  padding: 12px;
  background: #1a1a1a;
  border-radius: 36px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0,0,0,.1);
}

.device-screen {
  aspect-ratio: 9/19.5;
  background: #f8fafc;
  border-radius: 28px;
  overflow: hidden;
}

.device-screenshot {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Social proof */
.social-proof {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.social-proof p {
  margin: 0 0 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

.metrics {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 2rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* How it works */
.how-it-works h2,
.features h2,
.performance h2,
.final-cta h2 {
  margin: 0 0 2.5rem;
  font-size: clamp(1.5rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  text-align: center;
}

.steps {
  display: grid;
  gap: 2rem;
}

@media (min-width: 768px) {
  .steps { grid-template-columns: repeat(3, 1fr); }
}

.step {
  padding: 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: box-shadow .2s, transform .2s;
}

.step:hover {
  box-shadow: var(--shadow-lg);
}

.step-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  background: #f3f4f6;
  border-radius: 10px;
}

.step h3 {
  margin: 0 0 0.5rem;
  font-size: 1.0625rem;
  font-weight: 600;
}

.step p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* Features */
.feature-grid {
  display: grid;
  gap: 1rem;
  text-align: center;
}

@media (min-width: 640px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

.feature-card {
  padding: 1.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: box-shadow .2s, border-color .2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: #d1d5db;
}

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 0.75rem;
  color: var(--text-muted);
}

.feature-icon svg { flex-shrink: 0; }

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.feature-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* Performance */
.performance {
  text-align: center;
  background: #fafafa;
  border-radius: var(--radius-lg);
}

.performance h2 { margin-bottom: 1rem; }

.performance p {
  margin: 0 auto 1.5rem;
  max-width: 42ch;
  color: var(--text-muted);
}

/* Final CTA */
.final-cta {
  text-align: center;
  padding-bottom: 3rem;
}

.final-cta h2 { margin-bottom: 1.5rem; }

/* Footer */
footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

footer p { margin: 0; }

footer nav {
  display: flex;
  gap: 1.5rem;
}

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

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

/* Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-content,
.hero-device,
.step,
.feature-card {
  animation: fadeUp .5s ease-out backwards;
}

.hero-device { animation-delay: .1s; }
.step:nth-child(1) { animation-delay: 0s; }
.step:nth-child(2) { animation-delay: .05s; }
.step:nth-child(3) { animation-delay: .1s; }
.feature-card:nth-child(1) { animation-delay: 0s; }
.feature-card:nth-child(2) { animation-delay: .05s; }
.feature-card:nth-child(3) { animation-delay: .1s; }
.feature-card:nth-child(4) { animation-delay: .15s; }