:root {
  color-scheme: light;
  --bg: #f8f9fb;
  --text: #111827;
  --muted: #5f6b7a;
  --primary: #2452f4;
  --primary-dark: #1d3edb;
  --card: #ffffff;
  --border: rgba(15, 23, 42, 0.1);
  --accent: #eef2ff;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

.hero {
  background: linear-gradient(135deg, #ffffff 0%, #eef2ff 100%);
  padding: 32px 6vw 80px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 48px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--border);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.95rem;
  color: var(--muted);
  flex-wrap: wrap;
}

.nav-cta {
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--primary);
  color: white;
  font-weight: 600;
}

.hero-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 48px;
  align-items: center;
}

.hero-text h1 {
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  line-height: 1.1;
  margin-bottom: 20px;
}

.eyebrow {
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--primary);
  font-size: 0.8rem;
  margin-bottom: 16px;
}

.subhead {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.primary-button,
.secondary-button {
  padding: 12px 22px;
  border-radius: 12px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.primary-button {
  background: var(--primary);
  color: white;
  box-shadow: 0 18px 30px -20px rgba(36, 82, 244, 0.7);
}

.primary-button:hover {
  background: var(--primary-dark);
}

.secondary-button {
  background: white;
  border: 1px solid var(--border);
  color: var(--text);
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.hero-highlights div {
  background: white;
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--border);
}

.highlight-title {
  display: block;
  font-weight: 600;
  margin-bottom: 4px;
}

.highlight-text {
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-card {
  background: var(--card);
  border-radius: 24px;
  padding: 28px;
  border: 1px solid var(--border);
  box-shadow: 0 30px 60px -50px rgba(15, 23, 42, 0.4);
}

.card-image {
  border-radius: 18px;
  overflow: hidden;
  margin-bottom: 16px;
  border: 1px solid var(--border);
}

.card-image img {
  width: 100%;
  display: block;
}
.card-label {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 16px;
}

.card-block {
  background: var(--accent);
  border-radius: 16px;
  padding: 18px;
  margin-bottom: 16px;
}

.card-title {
  font-weight: 600;
  margin-bottom: 12px;
}

.card-preview {
  display: grid;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text);
}

.card-caption {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
  letter-spacing: 0.08em;
}

.math {
  font-weight: 600;
}

.math-block {
  background: white;
  border-radius: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  font-family: "Courier New", monospace;
  font-size: 0.95rem;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill-row span {
  background: white;
  border-radius: 999px;
  padding: 6px 14px;
  font-weight: 600;
  border: 1px solid var(--border);
}

.section {
  padding: 80px 6vw;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 40px;
}

.section-heading h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  margin-bottom: 16px;
}

.section-heading p {
  color: var(--muted);
  font-size: 1.05rem;
}

.section-media {
  margin-bottom: 32px;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 48px -40px rgba(15, 23, 42, 0.4);
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.section-media img {
  width: 100%;
  display: block;
}
.feature-grid,
.privacy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.feature-grid article,
.privacy-grid div {
  background: white;
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--border);
}

.feature-grid h3,
.privacy-grid h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.feature-grid p,
.privacy-grid p {
  color: var(--muted);
  font-size: 0.96rem;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.audience-card {
  background: white;
  padding: 22px;
  border-radius: 16px;
  border: 1px solid var(--border);
  font-weight: 600;
  text-align: center;
}

.cta {
  background: var(--primary);
  color: white;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-radius: 24px;
  margin: 0 6vw 80px;
  padding: 48px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.cta p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 520px;
}

footer {
  background: #0f172a;
  color: white;
  padding: 40px 6vw;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
}

footer p {
  color: rgba(255, 255, 255, 0.7);
  margin-top: 8px;
}

.developer-name {
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, 0.8);
}

@media (max-width: 720px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta {
    margin: 0 4vw 60px;
  }
}