:root {
  color-scheme: dark light;
  --bg-primary: #0f172a;
  --bg-secondary: #111c30;
  --bg-alt: #16213b;
  --text-primary: #f8fafc;
  --text-muted: #cbd5f5;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.16);
  --card-border: rgba(148, 163, 209, 0.2);
  --shadow: 0 20px 45px rgba(15, 23, 42, 0.35);
}

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

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

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

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(1120px, calc(100% - 3rem));
  margin: 0 auto;
}

.narrow {
  width: min(680px, calc(100% - 3rem));
  text-align: center;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 99;
  backdrop-filter: blur(10px);
  background-color: rgba(15, 23, 42, 0.9);
  border-bottom: 1px solid rgba(148, 163, 209, 0.15);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.brand {
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: 0.03em;
}

.brand span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-weight: 500;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--accent);
}

.nav-links .active {
  color: var(--accent);
}

.hero {
  padding: clamp(4rem, 9vw, 7rem) 0;
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.25), transparent 40%), var(--bg-primary);
}

.hero-content {
  text-align: center;
  display: grid;
  gap: 1.5rem;
}

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.9rem, 3vw, 2.4rem);
}

h3 {
  font-size: 1.3rem;
}

p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
}

.button.primary {
  background: var(--accent);
  color: #0f172a;
  box-shadow: 0 15px 35px rgba(56, 189, 248, 0.35);
}

.button.primary:hover,
.button.primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(56, 189, 248, 0.45);
}

.button.ghost {
  border-color: rgba(148, 163, 209, 0.5);
  color: var(--text-primary);
  background: transparent;
}

.button.ghost:hover,
.button.ghost:focus {
  border-color: var(--accent);
  color: var(--accent);
}

.section {
  padding: clamp(3.5rem, 8vw, 5.5rem) 0;
}

.section.alt {
  background-color: var(--bg-secondary);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.feature-card {
  background-color: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1.75rem;
  box-shadow: var(--shadow);
  min-height: 220px;
}

.use-case-grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.use-case-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.use-case-list li {
  position: relative;
  padding-left: 1.5rem;
}

.use-case-list li::before {
  content: "";
  position: absolute;
  top: 0.55rem;
  left: 0;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--accent-soft);
}

.card-stack {
  display: grid;
  gap: 1.25rem;
}

.stack-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.2);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

.cta-panel {
  display: grid;
  gap: 1.5rem;
  align-items: center;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(15, 23, 42, 0.75));
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: 24px;
  padding: clamp(2rem, 5vw, 3rem);
}

.cta-actions {
  display: grid;
  gap: 0.75rem;
  justify-items: start;
}

.cta-subtext {
  margin: 0;
  font-size: 0.95rem;
}

.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid rgba(148, 163, 209, 0.15);
  background: rgba(10, 14, 25, 0.9);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.95rem;
}

.footer-links {
  display: inline-flex;
  gap: 1.25rem;
  color: var(--text-muted);
}

.contact-hero {
  background: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.contact-card {
  background-color: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1.8rem;
  box-shadow: var(--shadow);
  display: grid;
  gap: 1rem;
}

.eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.not-found {
  display: grid;
  place-items: center;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.2), transparent 45%), var(--bg-primary);
  text-align: center;
}

@media (max-width: 720px) {
  .nav-wrapper {
    flex-direction: column;
    gap: 0.75rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .feature-card,
  .stack-card,
  .contact-card {
    min-height: auto;
  }

  .cta-panel {
    text-align: center;
  }

  .cta-actions {
    justify-items: center;
  }

  .footer-content {
    justify-content: center;
    text-align: center;
  }
}