:root {
  color-scheme: dark;
  --bg: #0b1020;
  --card: #151c30;
  --text: #edf2ff;
  --muted: #a7b4d6;
  --accent: #3dd5f3;
  --accent-strong: #20b9d8;
  --danger: #ff7d88;
  --success: #64f0a9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #1a2442, var(--bg) 40%);
  color: var(--text);
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
}

.shell {
  width: min(820px, 100%);
}

.card {
  background: color-mix(in oklab, var(--card), black 12%);
  border: 1px solid color-mix(in oklab, var(--accent), transparent 80%);
  border-radius: 18px;
  box-shadow: 0 18px 40px rgb(0 0 0 / 30%);
  padding: clamp(1.2rem, 2vw, 2rem);
}

.hidden {
  display: none;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-size: 0.78rem;
}

h1,
h2 {
  margin-bottom: 0.5rem;
}

p {
  color: var(--muted);
  line-height: 1.6;
}

.challenge-form {
  margin-top: 1.25rem;
}

.challenge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.7rem;
}

.honeypot {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

input {
  background: #0f1630;
  color: var(--text);
  border: 1px solid #33436f;
  border-radius: 10px;
  padding: 0.72rem 0.85rem;
  min-width: 180px;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 10px;
  padding: 0.72rem 1rem;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
}

button,
.button.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  color: #07131f;
}

.button.secondary {
  background: #27355e;
  color: var(--text);
}

.actions {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.portal {
  position: relative;
}

.placeholder-block {
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid #303d64;
}

.alt-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.placeholder-list {
  margin-top: 0.7rem;
  margin-bottom: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.55rem;
}

.placeholder-list li {
  color: var(--muted);
}

.placeholder-list a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.12rem;
}

.message {
  margin-top: 0.85rem;
  min-height: 1.5em;
  font-weight: 600;
}

.message.error {
  color: var(--danger);
}

.message.success {
  color: var(--success);
}