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

:root {
  --dark:   #0f172a;
  --mid:    #1e293b;
  --muted:  #64748b;
  --accent: #2563eb;
  --light:  #f8fafc;
  --white:  #ffffff;
  --border: #e2e8f0;
  --r:      12px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--white);
  color: var(--mid);
  line-height: 1.6;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── NAV ─────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 1rem 0;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--dark);
}

.logo-mark {
  width: 44px;
  height: 32px;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-name {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--dark);
}

.logo-sub {
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── BUTTONS ─────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1.75rem;
  border-radius: var(--r);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.85; }

.btn-outline {
  display: inline-block;
  border: 1.5px solid var(--border);
  color: var(--mid);
  padding: 0.5rem 1.25rem;
  border-radius: var(--r);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.15s, color 0.15s;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-primary-light {
  display: inline-block;
  background: #fff;
  color: var(--dark);
  padding: 0.9rem 2.25rem;
  border-radius: var(--r);
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  transition: opacity 0.15s;
}
.btn-primary-light:hover { opacity: 0.88; }

/* ── HERO ────────────────────────────────────────────── */
.hero {
  background: var(--dark);
  color: #fff;
  padding: 7rem 0 8rem;
}

.eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #94a3b8;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
}

.lead {
  font-size: 1.1rem;
  color: #94a3b8;
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.75;
}

/* ── CH CROSS ────────────────────────────────────────── */
.ch-cross {
  display: inline-block;
  width: 14px;
  height: 14px;
  vertical-align: middle;
  margin: 0 0.1em;
  position: relative;
  top: -1px;
}

/* ── PHILOSOPHY ──────────────────────────────────────── */
.philosophy {
  padding: 6rem 0;
  background: var(--light);
}

.section-label {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 1rem;
}

.philosophy h2,
.pricing h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--dark);
  margin-bottom: 0.75rem;
}

.section-text {
  font-size: 1rem;
  color: var(--muted);
  max-width: 560px;
  margin-bottom: 3.5rem;
  line-height: 1.7;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.pillar {
  background: var(--white);
  border-radius: var(--r);
  padding: 2rem;
  border: 1px solid var(--border);
}

.pillar-num {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

.pillar h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.6rem;
}

.pillar p {
  font-size: 0.93rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ── USE CASES ───────────────────────────────────────── */
.usecases {
  padding: 6rem 0;
  background: var(--white);
}

.usecases h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--dark);
  margin-bottom: 0.75rem;
}

.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
}

.usecase-card {
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--r);
  padding: 1.75rem;
  background: var(--light);
}

.usecase-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 0.6rem;
}

.usecase-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ── PITFALLS ────────────────────────────────────────── */
.pitfalls {
  padding: 6rem 0;
  background: var(--dark);
  color: #fff;
}

.pitfalls .section-label { color: #f87171; }

.pitfalls h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #fff;
  margin-bottom: 0.75rem;
}

.pitfalls .section-text {
  color: #94a3b8;
  margin-bottom: 3rem;
}

.pitfall-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.pitfall-card {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 3px solid #f87171;
  border-radius: var(--r);
  padding: 1.75rem;
  background: rgba(255, 255, 255, 0.03);
}

.pitfall-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 0.6rem;
}

.pitfall-card p {
  font-size: 0.9rem;
  color: #94a3b8;
  line-height: 1.7;
}

/* ── ABOUT ───────────────────────────────────────────── */
.about {
  padding: 6rem 0;
  background: var(--light);
}

.about h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--dark);
  margin-bottom: 1.5rem;
}

.about-text {
  max-width: 640px;
}

.about-text p {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 1rem;
}

.about-text p:last-child { margin-bottom: 0; }

.about-text em {
  font-style: normal;
  color: var(--dark);
  font-weight: 600;
}

/* ── PRICING ─────────────────────────────────────────── */
.pricing { padding: 6rem 0; }

.pricing-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.price-card {
  background: var(--dark);
  color: #fff;
  border-radius: calc(var(--r) * 1.5);
  padding: 2.5rem;
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1.75rem;
}

.price-amount span {
  font-size: 1rem;
  font-weight: 400;
  color: #94a3b8;
  letter-spacing: 0;
}

.price-features {
  list-style: none;
  margin-bottom: 2rem;
}

.price-features li {
  position: relative;
  padding: 0.6rem 0 0.6rem 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 0.93rem;
  color: #cbd5e1;
}

.price-features li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ── CONTACT ─────────────────────────────────────────── */
.contact {
  background: var(--accent);
  padding: 6rem 0;
  text-align: center;
}

.contact-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.contact h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #fff;
}

.contact p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

/* ── FOOTER ──────────────────────────────────────────── */
footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ── RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 768px) {
  .pricing-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 600px) {
  .hero { padding: 5rem 0 6rem; }
  .philosophy, .usecases, .pricing, .contact { padding: 4rem 0; }

  .footer-inner {
    flex-direction: column;
    gap: 0.4rem;
    text-align: center;
  }
}