:root {
  --bg: #F7F6F3;
  --bg-warm: #F2EDE6;
  --fg: #111111;
  --fg-muted: #6B6B6B;
  --accent: #0A8A7A;
  --accent-light: #E6F5F3;
  --amber: #D97706;
  --amber-light: #FEF3C7;
  --surface: #FFFFFF;
  --border: #E5E4E0;
  --font-head: 'Syne', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 246, 243, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.nav-logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.nav-badge {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid rgba(10, 138, 122, 0.2);
  border-radius: 100px;
  padding: 2px 10px;
}

/* ── HERO ── */
.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
  border-bottom: 1px solid var(--border);
}
.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}
.hero-headline {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--fg);
  margin-bottom: 1.5rem;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 560px;
  line-height: 1.65;
  margin-bottom: 3rem;
}
.hero-stat-row {
  display: flex;
  gap: 0;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface);
  max-width: 700px;
}
.hero-stat {
  flex: 1;
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.hero-stat-num {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.02em;
}
.hero-stat-label {
  font-size: 0.72rem;
  color: var(--fg-muted);
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
}
.hero-stat-divider {
  width: 1px;
  background: var(--border);
  align-self: stretch;
}

/* ── PROBLEM ── */
.problem {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4.5rem 2rem;
  border-bottom: 1px solid var(--border);
}
.problem-label,
.how-label,
.usecases-label,
.security-label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 1rem;
}
.problem-headline,
.how-headline,
.usecases-headline {
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--fg);
  margin-bottom: 1rem;
  max-width: 640px;
}
.problem-body {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 580px;
  margin-bottom: 2.5rem;
}
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  max-width: 800px;
}
.problem-card {
  background: var(--surface);
  padding: 1.75rem 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.problem-card-icon {
  color: var(--amber);
  margin-bottom: 0.25rem;
}
.problem-card-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--fg);
}
.problem-card-body {
  font-size: 0.875rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* ── HOW ── */
.how {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4.5rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.how-sub {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 580px;
  margin-bottom: 2.5rem;
}
.how-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 700px;
}
.how-step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}
.how-step:last-child { border-bottom: none; }
.how-step-num {
  font-family: var(--font-head);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-light);
  border: 1px solid rgba(10, 138, 122, 0.2);
  border-radius: 6px;
  padding: 3px 8px;
  min-width: 36px;
  text-align: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.how-step-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--fg);
  margin-bottom: 0.2rem;
}
.how-step-body {
  font-size: 0.875rem;
  color: var(--fg-muted);
  line-height: 1.55;
}

/* ── USE CASES ── */
.usecases {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4.5rem 2rem;
  border-bottom: 1px solid var(--border);
}
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  max-width: 700px;
}
.usecase-card {
  background: var(--surface);
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.usecase-icon {
  color: var(--accent);
  margin-bottom: 0.25rem;
}
.usecase-title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--fg);
}
.usecase-body {
  font-size: 0.825rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* ── SECURITY ── */
.security {
  background: var(--fg);
  color: #fff;
}
.security-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.security-label {
  color: rgba(255,255,255,0.5);
}
.security-headline {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 0.75rem;
  max-width: 480px;
}
.security-body {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.65;
  max-width: 480px;
}
.security-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex-shrink: 0;
}
.badge {
  font-family: var(--font-head);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #fff;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  padding: 5px 12px;
}

/* ── CLOSING ── */
.closing {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
  border-bottom: 1px solid var(--border);
}
.closing-headline {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--fg);
  margin-bottom: 1rem;
  max-width: 700px;
}
.closing-body {
  font-size: 1.05rem;
  color: var(--fg-muted);
  line-height: 1.65;
  max-width: 500px;
}

/* ── FOOTER ── */
.footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.footer-logo {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fg);
}
.footer-tagline {
  font-size: 0.875rem;
  color: var(--fg-muted);
}
.footer-copy {
  font-size: 0.75rem;
  color: var(--fg-muted);
  margin-top: 0.5rem;
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .hero { padding: 3rem 1.25rem 2.5rem; }
  .hero-stat-row { flex-direction: column; }
  .hero-stat-divider { width: 100%; height: 1px; }
  .problem-grid { grid-template-columns: 1fr; }
  .usecases-grid { grid-template-columns: 1fr; }
  .security-inner { flex-direction: column; }
  .security-badges { justify-content: flex-start; }
  .how, .problem, .usecases, .closing { padding: 3rem 1.25rem; }
}

@media (max-width: 480px) {
  .hero-headline { font-size: 2rem; }
  .closing-headline { font-size: 1.6rem; }
}