#header {
  background: linear-gradient(135deg, #2d5a3d 0%, #3d7a4d 100%);
  color: #f5f5f0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  font-weight: bold;
  position: fixed;
  top: 0;
  width: 100%;
  transition: height 0.3s ease, background-color 0.3s ease;
  height: 100px; /* bigger on desktop */
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  box-sizing: border-box;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

body {
  background: linear-gradient(to bottom, #b8d4ae 0%, #a3c98a 50%, #8fb97a 100%);
  min-height: 100vh;
  margin: 0px;
  padding-top: 100px; /* match header height */
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #2d5a3d;
}

.header-peek {
  position: absolute;
  left: 20px;
  bottom: 0;
  height: 100px;
  width: 100px;
  border-radius: 8px;
  object-fit: cover;
  transition: transform 0.25s ease;
}

.header-hidden {
  position: absolute;
  left: 20px;
  bottom: 0;
  height: 100px;
  width: 100px;
  border-radius: 8px;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.25s ease;
  z-index: 10;
}

#header h1 {
  margin: 0;
  text-align: center;
  font-size: 48px;
  transition: font-size 0.25s ease;
  letter-spacing: 2px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* Shrunk state */
#header.scrolled {
  height: 50px;
}

#header.scrolled h1 {
  font-size: 28px;
}

#header.scrolled .header-peek {
  transform: translateY(12.5px); /* move down 50% (50px of 100px / 2) */
}

#header.scrolled .header-hidden {
  opacity: 1; /* show me-hidden.png on top */
  transform: none; /* no transform */
}

/* Mobile/phone screens: revert to original sizes */
@media (max-width: 768px) {
  #header {
    height: 80px;
  }

  body {
    padding-top: 80px;
  }

  .header-peek {
    height: 80px;
    width: 80px;
  }

  .header-hidden {
    height: 80px;
    width: 80px;
  }

  #header h1 {
    font-size: 36px;
  }

  #header.scrolled {
    height: 40px;
  }

  #header.scrolled h1 {
    font-size: 22px;
  }

  #header.scrolled .header-peek {
    transform: translateY(10px); /* move down 50% (40px of 80px / 2) */
  }
}