:root {
  --ink: #0a0a0a;
  --ink-soft: #52525b;
  --paper: #ffffff;
  --surface: #f4f4f5;
  --border: #e4e4e7;
  --accent: #b45309;
  --accent-soft: #fef3c7;
  --radius: 10px;
  --max-width: 1120px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
}

img {
  max-width: 100%;
  display: block;
}

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

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--accent);
  display: inline-block;
}

.brand-accent {
  color: var(--ink-soft);
  font-weight: 500;
}

.nav {
  display: flex;
  gap: 28px;
  flex: 1;
  justify-content: center;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.05s ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  opacity: 0.85;
}

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}

.btn-ghost:hover {
  background: var(--surface);
}

.btn-lg {
  padding: 14px 26px;
  font-size: 1rem;
}

/* Hero */

.hero {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: 760px;
  text-align: center;
  margin: 0 auto;
}

.eyebrow {
  display: inline-block;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin: 0 0 20px;
}

.hero h1 {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  line-height: 1.15;
  font-weight: 800;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Section shared */

.section-title {
  font-size: clamp(1.6rem, 2.6vw, 2.1rem);
  font-weight: 800;
  text-align: center;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.section-sub {
  text-align: center;
  color: var(--ink-soft);
  margin: 0 0 48px;
  font-size: 1.05rem;
}

/* Features */

.features {
  padding: 88px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}

.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-size: 1.1rem;
  margin: 0 0 8px;
  font-weight: 700;
}

.feature-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* How it works */

.how-it-works {
  padding: 88px 0;
  border-bottom: 1px solid var(--border);
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  text-align: left;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 700;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1.05rem;
  margin: 0 0 8px;
}

.step p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* CTA */

.cta {
  padding: 96px 0;
  text-align: center;
  background: var(--ink);
  color: var(--paper);
}

.cta h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.cta p {
  color: #d4d4d8;
  margin: 0 0 32px;
  font-size: 1.05rem;
}

.cta .btn-primary {
  background: var(--paper);
  color: var(--ink);
}

/* Footer */

.site-footer {
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.footer-inner a {
  color: var(--ink-soft);
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--ink);
}

/* Responsive */

@media (max-width: 860px) {
  .nav {
    display: none;
  }

  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .header-actions .btn-ghost {
    display: none;
  }

  .hero {
    padding: 64px 0 56px;
  }

  .features,
  .how-it-works,
  .cta {
    padding: 64px 0;
  }
}