html, body {
  height: 100%;
  min-height: 100vh;
  background-color: #0a2233;
}
html, body {
  height: 100%;
  min-height: 100vh;
}
body.dark-mode {
  background-color: #0a2233;
  color: #f8f9fa;
  background-image: url("../images/01.avif");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center bottom;
  background-attachment: fixed;
}
body.light-mode {
  background-color: #f8f9fa;
  color: #212529;
  background-image: url("../images/01.avif");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center bottom;
  background-attachment: fixed;
}
.custom-card {
  max-width: 50rem;
  margin: 0 auto;
  border-radius: 10px !important;
  background: transparent;
}
body.light-mode .custom-card {
  background: rgba(255,255,255,0.92);
  color: #212529;
}
body.dark-mode .custom-card {
  background: rgba(10,34,51,0.96);
  color: #f8f9fa;
}

/* Desktop */
.header-buttons {
    display: flex;
    gap: .35rem;
    flex-wrap: nowrap;
}

/* Mobile */
@media (max-width: 576px) {

    .header-row {
        flex-direction: column;
        align-items: flex-start !important;
    }

    .header-buttons {
        width: 100%;
        margin-top: 1rem;

        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: .5rem;
    }

    .header-buttons .btn,
    .header-buttons .downloadButton {
        width: 100%;
        text-align: center;
    }
}

/* Custom download button style */
.downloadButton {
    background: #212529;
    color: #fff !important;
    border: 1px solid #fff;
    text-decoration: none;
    transition: background .2s, color .2s;
}

body.light-mode .downloadButton {
    background: #f8f9fa;
    color: #212529 !important;
    border: 1px solid #212529;
}

body.dark-mode .downloadButton {
    background: #212529;
    color: #fff !important;
    border: 1px solid #fff;
}

.downloadButton:hover,
.downloadButton:focus {
    filter: brightness(1.1);
    outline: 2px solid #888;
    text-decoration: none;
}

/* Toggle Theme button contrast */
#themeToggle {
  background: #212529;
  color: #fff;
  border: none;
  transition: background 0.2s, color 0.2s;
}
body.light-mode #themeToggle {
  background: #f8f9fa;
  color: #212529;
  border: 1px solid #212529;
}
body.dark-mode #themeToggle {
  background: #212529;
  color: #fff;
  border: 1px solid #fff;
}
#themeToggle:hover, #themeToggle:focus {
  filter: brightness(1.1);
  outline: 2px solid #888;
}

/* Link color for dark mode */
body.dark-mode a, body.dark-mode a:visited {
  color: #4dc3ff;
}
body.light-mode a, body.light-mode a:visited {
  color: #0a2233;
}

/* Register button color for both themes */
body.dark-mode #submit {
  background: #4dc3ff;
  color: #0a2233;
  border: none;
}
body.light-mode #submit {
  background: #0a2233;
  color: #fff;
  border: none;
}
#submit:disabled {
  opacity: 0.6;
}

/* Alert box background for dark mode */
body.dark-mode .alert-info {
  background: rgba(77,195,255,0.15);
  color: #b8e6ff;
  border-color: #4dc3ff;
}
body.light-mode .alert-info {
  background: #e9f7fe;
  color: #0a2233;
  border-color: #b8e6ff;
}

/* Input backgrounds for dark mode */
body.dark-mode .form-control {
  background: #18344a;
  color: #fff;
  border: 1px solid #4dc3ff;
}
body.dark-mode .form-control:focus {
  background: #204060;
  color: #fff;
  border-color: #4dc3ff;
}
body.light-mode .form-control {
  background: #fff;
  color: #212529;
  border: 1px solid #0a2233;
}
body.light-mode .form-control:focus {
  background: #f0f8ff;
  color: #212529;
  border-color: #0a2233;
}

/* Remove white from mb-0 ul in alert */
body.dark-mode .alert-info ul.mb-0 {
  background: transparent;
  color: #b8e6ff;
}