:root {
  color-scheme: light;
  --ink: #102033;
  --muted: #5b6677;
  --paper: #ffffff;
  --line: #d9e3ea;
  --navy: #0c233c;
  --cyan: #00a6c8;
  --green: #3aa76d;
  --amber: #f0a83a;
  --radius: 8px;
  --shadow: 0 18px 48px rgba(12, 35, 60, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #f7fafc; color: var(--ink); }
a { color: inherit; }
img { display: block; max-width: 100%; }
.site-header { background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(217,227,234,.82); backdrop-filter: blur(18px); position: sticky; top: 0; z-index: 20; }
.nav, .wrap { max-width: 1180px; margin: 0 auto; }
.nav { align-items: center; display: flex; gap: 18px; justify-content: space-between; padding: 14px 22px; }
.brand { display: grid; gap: 2px; text-decoration: none; }
.brand strong { font-size: 15px; }
.brand span, p, li { color: var(--muted); }
.brand span { font-size: 12px; }
.nav-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.btn { align-items: center; border: 1px solid var(--navy); border-radius: 999px; display: inline-flex; font-weight: 850; min-height: 42px; padding: 10px 14px; text-decoration: none; }
.btn.primary { background: var(--navy); color: #fff; }
.btn.secondary { background: #fff; color: var(--navy); }
.hero { background: linear-gradient(90deg, rgba(12,35,60,.97), rgba(12,35,60,.72)), url("gh300-copilot-study-hero-carlos-crudo.png") center/cover; color: #fff; padding: 82px 22px 58px; }
.hero .wrap { display: grid; gap: 18px; }
.kicker { color: #00a6c8; font-size: 12px; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.hero .kicker { color: #9de5f5; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(2.35rem, 6vw, 4.9rem); line-height: .98; margin-bottom: 0; max-width: 930px; }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); line-height: 1.06; margin-bottom: 0; }
h3 { color: var(--navy); line-height: 1.28; }
p, li { line-height: 1.64; }
.hero p { color: #d7e7ef; font-size: 1.08rem; max-width: 780px; }
.section { padding: 62px 22px; }
.section.alt { background: #fff; }
.section-head { display: grid; gap: 10px; max-width: 820px; margin-bottom: 24px; }
.grid { display: grid; gap: 18px; grid-template-columns: repeat(12, 1fr); }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.card, .step, .note, .gallery-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; }
.note { background: #071827; color: #fff; }
.note p, .note li, .note a { color: #d7e7ef; }
.warning { border-left: 4px solid var(--amber); }
.success { border-left: 4px solid var(--green); }
.step-list { counter-reset: step; display: grid; gap: 14px; }
.step { counter-increment: step; }
.step::before { content: counter(step, decimal-leading-zero); color: var(--cyan); display: block; font-size: 13px; font-weight: 900; margin-bottom: 10px; }
.checklist { display: grid; gap: 10px; list-style: none; margin: 0; padding: 0; }
.checklist li { border-top: 1px solid var(--line); padding-top: 10px; }
.gallery { display: grid; gap: 14px; grid-template-columns: repeat(3, 1fr); }
.gallery-card { padding: 12px; }
.gallery-card img { border: 1px solid var(--line); border-radius: var(--radius); width: 100%; }
.gallery-card span { color: var(--muted); display: block; font-size: 12px; font-weight: 800; margin-top: 9px; }
.gallery-card p { font-size: 13px; margin: 6px 0 0; }
.footer { background: #071827; color: #fff; padding: 30px 22px; }
.footer p { color: #c8d8e3; margin: 0; }

.trust-footer {
  background: #071827;
  color: #fff;
  padding: 42px 22px 34px;
}

.trust-footer .wrap {
  display: grid;
  gap: 24px;
}

.trust-panel {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(260px, 0.9fr) minmax(0, 1.6fr);
  align-items: center;
}

.trust-copy {
  display: grid;
  gap: 12px;
}

.trust-copy h2 {
  color: #fff;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.08;
  margin: 0;
}

.trust-copy p {
  color: #c8d8e3;
  margin: 0;
}

.trust-links,
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.trust-link {
  border: 1px solid rgba(157, 229, 245, 0.38);
  border-radius: 999px;
  color: #e6f8fc;
  font-size: 13px;
  font-weight: 800;
  padding: 9px 13px;
  text-decoration: none;
}

.cert-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cert-card {
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(157, 229, 245, 0.22);
  border-radius: var(--radius);
  display: grid;
  gap: 10px;
  justify-items: center;
  margin: 0;
  padding: 14px 12px 12px;
}

.cert-card img {
  aspect-ratio: 1 / 1.18;
  height: 150px;
  object-fit: contain;
  width: auto;
}

.cert-card figcaption {
  color: #d7e7ef;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
}

.footer-meta {
  border-top: 1px solid rgba(157, 229, 245, 0.18);
  justify-content: space-between;
  padding-top: 18px;
}

.footer-meta p {
  color: #c8d8e3;
  margin: 0;
}

@media (max-width: 900px) {

  .trust-panel {
    grid-template-columns: 1fr;
  }

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

  .cert-card img {
    height: 138px;
  }

  .footer-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .span-4, .span-6 { grid-column: 1 / -1; }
  .gallery { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; flex-direction: column; }
}