:root {
  --accent: teal;
  --accent-light: #84dee1;
  --accent-lighter: #c1eff0;
  --accent-darker: #044;
  --font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  background-color: #040812;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: white;
  line-height: 1.65;
  font-family: var(--font-family);
  font-size: 1rem;
}

#background {
  z-index: -1;
  position: fixed;
  inset: 0;
  background: #040812 url("background.svg") center / cover no-repeat;
}

#content {
  max-width: 800px;
  padding: 1.5em 2em;
  margin: 2.5rem auto;
  background: rgba(6, 16, 28, 0.62);
  border: 1px solid rgba(132, 222, 225, 0.22);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px) saturate(1.3);
  -webkit-backdrop-filter: blur(12px) saturate(1.3);
}

@media (max-width: 840px) {
  #content {
    margin: 0.75rem;
    padding: 1em;
    border-radius: 10px;
  }
}

a {
  color: var(--accent-lighter);
}

a:visited {
  color: var(--accent-light);
}

hr {
  border: none;
  border-top: 2px solid rgba(132, 222, 225, 0.35);
}

code {
  background: var(--accent-darker);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  word-break: break-all;
}

.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5em;
}

.site-name {
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

.site-name:visited {
  color: white;
}

.topnav .links {
  display: flex;
  gap: 1.2em;
}

.topnav .links a {
  text-decoration: none;
}

.topnav .links a.active {
  color: white;
  border-bottom: 2px solid var(--accent-light);
}

.muted {
  opacity: 0.7;
  font-size: 0.9em;
}

.card {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(132, 222, 225, 0.18);
  border-radius: 8px;
  padding: 0.9em 1.2em;
  margin: 1em 0;
}

button,
.button {
  font-family: var(--font-family);
  font-size: 1rem;
  background-color: var(--accent);
  color: white;
  padding: 0.5em 1.4em;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

button:hover:not(:disabled),
.button:hover {
  background-color: #0aa;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.question {
  margin: 1.4em 0;
}

.question .q-title {
  font-weight: bold;
  margin-bottom: 0.4em;
}

.question label {
  display: block;
  padding: 0.45em 0.8em;
  margin: 0.3em 0;
  border: 1px solid rgba(132, 222, 225, 0.18);
  border-radius: 6px;
  cursor: pointer;
}

.question label:hover {
  border-color: var(--accent-light);
}

.question input[type="radio"] {
  accent-color: var(--accent);
  margin-right: 0.6em;
}

.result-pass {
  border-color: rgba(0, 255, 128, 0.4);
}

.result-fail {
  border-color: rgba(255, 128, 96, 0.5);
}

.invite-box {
  display: flex;
  gap: 0.6em;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.6em;
}

.invite-box code {
  flex: 1;
  min-width: 200px;
  padding: 0.5em 0.7em;
}

.success {
  color: #7fff9f;
}

.fail {
  color: lightcoral;
}

ol li,
ul li {
  margin: 0.4em 0;
}

h2 {
  color: var(--accent-lighter);
}

h3 {
  color: var(--accent-light);
  margin-top: 1.6em;
}