:root {
  --viewer-blue: #084da3;
  --viewer-ink: #143453;
  --viewer-soft: #f5f9ff;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  margin: 0;
  background: var(--viewer-soft);
  color: var(--viewer-ink);
  font-family: Helvetica, Arial, sans-serif;
}

.certificate-viewer { min-height: 100vh; }

.viewer-header {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid rgba(8, 77, 163, .08);
  box-shadow: 0 8px 22px rgba(13, 56, 105, .06);
}

.viewer-brand img { display: block; width: 126px; height: auto; }

.viewer-back {
  color: var(--viewer-blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  text-decoration: none;
}

.viewer-content {
  width: min(100% - 32px, 1240px);
  margin: 0 auto;
  padding: clamp(30px, 5vw, 60px) 0;
}

.viewer-heading { margin-bottom: 22px; }

.eyebrow {
  margin: 0 0 6px;
  color: var(--viewer-blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  color: var(--viewer-blue);
  font-family: "Barlow", Arial, sans-serif;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  text-transform: uppercase;
}

#certificate-frame {
  display: block;
  width: 100%;
  height: min(78vh, 1000px);
  border: 1px solid rgba(8, 77, 163, .18);
  background: #fff;
}

.viewer-fallback {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.5;
}

.viewer-fallback a { color: var(--viewer-blue); font-weight: 700; }

@media (max-width: 600px) {
  .viewer-header { min-height: 66px; }
  .viewer-brand img { width: 108px; }
  .viewer-back { font-size: 11px; }
  #certificate-frame { height: 72vh; }
}