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

:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1f2933;
  background-color: #f5f7fb;
  line-height: 1.5;
}

body {
  margin: 0;
}

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

.container {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 247, 251, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0.5rem;
}

.logo {
  font-weight: 700;
  text-transform: lowercase;
  letter-spacing: 0.06em;
  font-size: 1.1rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  text-decoration: none;
  color: #1f2933;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav a:hover {
  background: rgba(15, 23, 42, 0.06);
}

.nav-cta {
  background: #2563eb;
  color: #f9fafb;
}

.nav-cta:hover {
  background: #1d4ed8;
  color: #f9fafb;
}

.hero {
  padding: 3.5rem 0 3rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.5fr);
  gap: 2rem;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(2rem, 3vw + 1rem, 3rem);
  margin: 0.25rem 0 0.75rem;
}

.hero-sub {
  font-size: 1.02rem;
  max-width: 32rem;
  color: #374151;
  margin-bottom: 1.25rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.7rem;
  color: #6b7280;
}

.hero-card {
  background: #ffffff;
  border-radius: 1.25rem;
  padding: 1.5rem 1.75rem;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.hero-pill {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: #eff6ff;
  color: #1d4ed8;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.75rem;
}

.hero-card-title {
  margin: 0 0 0.75rem;
  font-size: 1.25rem;
}

.hero-list {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.95rem;
}

.hero-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.hero-list li::before {
  content: "•";
  font-size: 1.1rem;
  line-height: 1;
  margin-top: 2px;
}

.email-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.email-form input[type="email"] {
  flex: 1;
  min-width: 0;
  padding: 0.6rem 0.8rem;
  border-radius: 999px;
  border: 1px solid rgba(15, 23, 42, 0.18);
  font-size: 0.95rem;
}

.email-form button {
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.3rem;
  font-size: 0.95rem;
  background: #2563eb;
  color: #f9fafb;
  cursor: pointer;
  white-space: nowrap;
  font-weight: 500;
}

.email-form button:hover {
  background: #1d4ed8;
}

.small-note {
  font-size: 0.8rem;
  color: #6b7280;
}

.section {
  padding: 3rem 0;
}

.section-alt {
  background: #f0f4ff;
}

.section h2 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

.section-intro {
  max-width: 40rem;
  color: #374151;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.feature {
  background: #ffffff;
  border-radius: 1rem;
  padding: 1.25rem;
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.feature h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.step {
  background: #ffffff;
  border-radius: 1rem;
  padding: 1.25rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.step-number {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #2563eb;
  color: #f9fafb;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.science-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 1.75rem 0;
}

.science-card {
  background: #ffffff;
  border-radius: 1rem;
  padding: 1.25rem;
  border: 1px solid rgba(37, 99, 235, 0.16);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.08);
}

.story-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 2rem;
  align-items: flex-start;
}

.story-card {
  background: #ffffff;
  border-radius: 1.1rem;
  padding: 1.25rem 1.4rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
}

.story-card ul {
  padding-left: 1.1rem;
}

.cta-section {
  background: #111827;
  color: #e5e7eb;
}

.cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.2fr);
  gap: 2rem;
  align-items: center;
}

.cta-section h2 {
  color: #f9fafb;
}

.cta-list {
  margin-top: 1rem;
  padding-left: 1.1rem;
}

.cta-form-card {
  background: #1f2937;
  border-radius: 1.1rem;
  padding: 1.3rem 1.4rem;
  border: 1px solid rgba(156, 163, 175, 0.6);
}

.cta-form-card h3 {
  margin-top: 0;
}

.cta-form-card .email-form input[type="email"] {
  background: #111827;
  color: #e5e7eb;
  border-color: rgba(156, 163, 175, 0.8);
}

.cta-form-card .email-form button {
  background: #f97316;
}

.cta-form-card .email-form button:hover {
  background: #ea580c;
}

.faq-list {
  max-width: 44rem;
}

.faq-item {
  width: 100%;
  border: 1px solid rgba(15, 23, 42, 0.1);
  border-radius: 0.9rem;
  padding: 0.7rem 0.9rem;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.98rem;
  cursor: pointer;
  margin-top: 0.5rem;
}

.faq-icon {
  font-size: 1.1rem;
  margin-left: 0.75rem;
}

.faq-panel {
  display: none;
  padding: 0.6rem 0.9rem 0.85rem;
  font-size: 0.95rem;
  color: #374151;
}

.faq-panel.open {
  display: block;
}

.site-footer {
  border-top: 1px solid rgba(15, 23, 42, 0.1);
  padding: 1.25rem 0;
  background: #f5f7fb;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8rem;
  color: #6b7280;
}

.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;
}

/* Responsive */

@media (max-width: 860px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-card {
    order: -1;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .story-grid,
  .cta-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .nav {
    justify-content: flex-start;
  }

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

  .science-grid {
    grid-template-columns: 1fr;
  }

  .email-form {
    flex-direction: column;
    align-items: stretch;
  }

  .email-form button {
    width: 100%;
    text-align: center;
  }
}