/* Base */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

/* Header (hero) */
header {
  width: 100%;
  background: #003366;         /* ETH-ish deep blue */
  color: #f0f4f8;
  box-shadow: 0 2px 4px rgba(0,0,0,.06);
}

.header-lower {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 16px 20px;
  text-align: center;
}

.header-lower h1 {
  margin: 0;
  font-size: clamp(1.8rem, 2.5vw + 1rem, 2.4rem);
  line-height: 1.2;
  font-weight: 700;
}

.header-lower p {
  margin: 10px 0 0;
  font-size: clamp(1rem, 1vw + .6rem, 1.25rem);
  font-weight: 400;
  opacity: 0.95;
}

/* Nav (tabs) */
nav {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 10px 8px 16px;
  flex-wrap: wrap;
}

nav a {
  text-decoration: none;
  color: #f0f4f8;
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 600;
  transition: background .2s ease, color .2s ease;
  border: 1px solid transparent;
}

nav a:hover { background: rgba(255,255,255,.15); }
nav a.active {
  background: #f0f4f8;
  color: #003366;
  border-color: #e6ecf2;
}

nav a.disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Main content */
.content-container {
  max-width: 980px;
  margin: 28px auto 24px;
  padding: 0 16px;
}

.readme-wrapper {
  background: #fff;
  border: 1px solid #eaecef;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 6px rgba(0,0,0,.04);
}

/* Make README headings look nice under the hero */
.readme-wrapper h1:first-child,
.readme-wrapper h2:first-child {
  margin-top: 0;
}

/* Footer */
footer {
  background: #f8f9fb;
  margin-top: 40px;
  border-top: 1px solid #eaecef;
}

.footer-container {
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 16px;
}

.footer-logos {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.footer-logos img {
  height: 42px;
  width: auto;
  display: block;
}

footer p {
  margin: 0;
  text-align: center;
  color: #4b5563;
  font-size: 0.95rem;
}

/* README content niceties */
.readme-wrapper img { max-width: 100%; height: auto; }
.readme-wrapper pre { overflow: auto; }
.readme-wrapper code, .readme-wrapper pre code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}