:root {
  color-scheme: dark;
  --bg: #0b0d13;
  --panel: #141723;
  --text: #f4f5fb;
  --muted: #b8bfce;
  --line: rgba(255, 255, 255, 0.13);
  --violet: #9b7cff;
  --cyan: #61d6d6;
  --rose: #ff8ab3;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 18% 0%, rgba(155, 124, 255, 0.22), transparent 30rem),
    radial-gradient(circle at 92% 14%, rgba(97, 214, 214, 0.14), transparent 28rem),
    linear-gradient(180deg, #10131d 0%, var(--bg) 66%, #07090f 100%);
  color: var(--text);
  line-height: 1.65;
}

a { color: inherit; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--cyan);
  color: #061013;
  padding: 0.5rem 0.75rem;
  z-index: 10;
}

.skip-link:focus { left: 1rem; top: 1rem; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(11, 13, 19, 0.78);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.nav,
.hero,
.section,
.footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  text-decoration: none;
  font-weight: 900;
  letter-spacing: 0.08em;
  font-size: 1.12rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem;
}

.nav-links a,
.button {
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.58rem 0.85rem;
  color: var(--muted);
  font-weight: 750;
}

.nav-links a:hover,
.nav-links a:focus,
.button.secondary {
  color: var(--text);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.05);
}

.hero {
  min-height: 68vh;
  display: grid;
  grid-template-columns: 1fr 0.55fr;
  gap: 2rem;
  align-items: center;
  padding: 5rem 0 3.5rem;
}

.hero-image {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.hero-image img,
.feature-card img {
  display: block;
  width: 100%;
  height: auto;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  max-width: 100%;
  margin-top: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.video-container iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 7vw, 6rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--cyan);
  text-transform: uppercase;
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.lede {
  max-width: 780px;
  margin: 1.4rem 0 0;
  color: #e1e4ef;
  font-size: clamp(1.13rem, 2vw, 1.42rem);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.6rem;
}

.button.primary {
  color: #090913;
  background: var(--cyan);
  border-color: var(--cyan);
}

.concept-card,
.section,
.card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.026));
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.concept-card {
  padding: 1.25rem;
}

.concept-card h2,
.section h2,
.card h2,
.card h3 {
  margin: 0 0 0.7rem;
  line-height: 1.12;
}

.card h2 {
  color: var(--cyan);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.card h3 {
  margin-top: 1.2rem;
}

.muted,
.concept-card p,
.section p,
.card p,
.faq p {
  color: var(--muted);
}

.section {
  padding: 1.5rem;
  margin-top: 1rem;
  margin-bottom: 1rem;
}

.section h2 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.3rem 0;
}

.card {
  padding: 1rem;
}

.feature-card img {
  border-radius: 8px;
  margin-bottom: 1rem;
}

.card ul {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  color: var(--muted);
}

.card li {
  margin-bottom: 0.7rem;
}

.section a,
.card a,
.footer a {
  color: var(--cyan);
  font-weight: 800;
}

.faq details {
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}

.faq summary {
  cursor: pointer;
  font-weight: 850;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0 3rem;
  color: var(--muted);
}

.footer a {
  margin-right: 1rem;
}

@media (max-width: 900px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 1rem 0;
  }

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

  .hero,
  .grid {
    grid-template-columns: 1fr;
  }

  .hero { padding-top: 4rem; }
}