:root {
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #122033;
  --sub: #4a5b73;
  --line: #d7deea;
  --primary: #1f7ae0;
  --hero-a: #0f223f;
  --hero-b: #14315d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: min(1180px, 92vw);
  margin: 0 auto;
}

.narrow {
  width: min(900px, 92vw);
}

.hero {
  background: linear-gradient(135deg, var(--hero-a), var(--hero-b));
  color: #f2f6ff;
  padding: 64px 0 56px;
}

.eyebrow {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #b7caf0;
}

.hero h1 {
  margin: 10px 0 8px;
  font-size: clamp(2rem, 4.8vw, 3.4rem);
  line-height: 1.1;
}

.subtitle {
  margin: 0;
  max-width: 820px;
  color: #d8e6ff;
  font-size: 1.1rem;
}

.actions {
  margin-top: 24px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid #b4c9f6;
  color: #e8f1ff;
  text-decoration: none;
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 600;
}

.btn svg {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
}

.btn.primary {
  background: #ecf3ff;
  color: #0f2d57;
  border-color: #ecf3ff;
}

.section {
  padding: 52px 0;
}

.section.alt {
  background: #eef3fa;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

h2 {
  margin: 0 0 8px;
  font-size: clamp(1.4rem, 3vw, 2rem);
}

p {
  margin: 0 0 16px;
  color: var(--sub);
}

figure {
  margin: 16px 0 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 10px 26px rgba(16, 40, 76, 0.06);
}

img {
  width: 100%;
  display: block;
  border-radius: 10px;
}

figcaption {
  margin-top: 10px;
  font-size: 0.9rem;
  color: #60728c;
}

.video-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
  margin-top: 18px;
}

.failure-case {
  margin-top: 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fdfefe;
}

.failure-case h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.prompt-details {
  margin: 0 0 12px;
}

.prompt-details summary {
  cursor: pointer;
  color: #255fa8;
  font-weight: 600;
}

.prompt-details p {
  margin-top: 8px;
  font-size: 0.92rem;
}

.model-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

.demo-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 10px 26px rgba(16, 40, 76, 0.06);
}

.demo-card video {
  width: 100%;
  display: block;
  border-radius: 10px;
  background: #000;
}

.demo-card h3 {
  margin: 10px 0 6px;
  font-size: 1rem;
}

.demo-card h4 {
  margin: 0 0 8px;
  font-size: 0.98rem;
}

.demo-card p {
  margin: 0;
  font-size: 0.92rem;
}

.grid.two {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 980px) {
  .grid.two {
    grid-template-columns: 1fr 1fr;
  }

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

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

.note {
  margin-top: 10px;
  font-size: 0.92rem;
  color: #5a6d8a;
}

pre {
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #0f1b2f;
  color: #d6e4ff;
  overflow: auto;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.footer-inner {
  padding: 16px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #6a7b93;
  font-size: 0.92rem;
}

footer a {
  color: #255fa8;
  text-decoration: none;
}