* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

/* --- Home page: full-screen cover image --- */
.bg-photo {
  position: fixed;
  inset: 0;
  background-image: url('fieldnotescover.png');
  background-size: 70%;
  background-position: center;
  background-repeat: no-repeat;
  background-color: #ffffff;
  filter: saturate(1) brightness(1);
  z-index: -1;
}

@media (max-width: 768px) {
  .bg-photo {
    background-image: url('fieldnotescovermobile.jpg');
    background-size: contain;
    background-color: #ffffff;
  }
}

/* --- Footer credit on home page (desktop only) --- */
.footer-credit {
  position: fixed;
  bottom: 24px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.85rem;
  color: #111111;
  z-index: 10;
  transform: translateX(-20px);
}

@media (max-width: 768px) {
  .footer-credit {
    display: none;
  }
}

/* --- About page: plain white background --- */
.about-page {
  background-color: #ffffff;
  color: #111111;
}

.about-content {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 120px 24px 60px;
}

@media (max-width: 768px) {
  .about-content {
    width: 100%;
    max-width: 600px;
  }
}

.about-content h1 {
  font-size: 1.1rem;
  letter-spacing: 0.03em;
  margin-top: 48px;
  margin-bottom: 16px;
}

.about-content h1:first-child {
  margin-top: 0;
}

.about-content p {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.about-content ul,
.about-content ol {
  margin: 0 0 16px 0;
  padding-left: 1.4em;
}

.about-content li {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 6px;
}

.about-content strong {
  font-weight: bold;
}

.about-content .divider {
  text-align: center;
  margin: 40px 0;
  font-size: 1.2rem;
  letter-spacing: 0.05em;
}

/* --- Shared nav --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 20px 0;
  z-index: 10;
}

.site-nav a {
  text-decoration: none;
  color: #0000EE;
  font-family: Helvetica, Arial, sans-serif;
  font-size: 0.95rem;
  text-transform: none;
  letter-spacing: normal;
}