:root {
  color-scheme: dark;
  --bg: #0a0d14;
  --bg-accent: radial-gradient(circle at top, rgba(83, 113, 255, 0.28), transparent 32%), radial-gradient(circle at bottom right, rgba(30, 187, 142, 0.18), transparent 24%);
  --card: rgba(14, 19, 31, 0.88);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #eef2ff;
  --muted: #aab4d3;
  --accent: #6d8cff;
  --accent-2: #4be0b3;
  --danger: #ff8f8f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, Arial, sans-serif;
  background: var(--bg-accent), var(--bg);
  color: var(--text);
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(100%, 560px);
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 28px;
  backdrop-filter: blur(18px);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.32);
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-2);
  font-size: 12px;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
}

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

.stack {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.compact {
  gap: 10px;
}

label,
.radio-row {
  display: grid;
  gap: 8px;
  color: var(--muted);
}

input {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 14px 16px;
  font-size: 16px;
}

button {
  border: 0;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), #8b5cff);
  color: white;
  padding: 14px 18px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

button:disabled {
  opacity: 0.65;
  cursor: progress;
}

.radio-row {
  grid-template-columns: auto 1fr;
  align-items: center;
}

.radio-row input {
  width: 18px;
  height: 18px;
}

.hidden {
  display: none;
}

.error {
  color: var(--danger);
  margin-top: 18px;
}

.invite-link {
  display: block;
  overflow-wrap: anywhere;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  text-decoration: none;
}

.instruction-gallery {
  display: grid;
  gap: 14px;
}

.instruction-gallery img {
  width: 100%;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.instruction-steps {
  display: grid;
  gap: 18px;
}

.instruction-step {
  display: grid;
  grid-template-columns: minmax(220px, 320px) 1fr;
  gap: 20px;
  align-items: center;
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.instruction-image-wrap {
  min-width: 0;
}

.instruction-image {
  display: block;
  width: 100%;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.instruction-copy {
  display: grid;
  gap: 10px;
}

.instruction-copy h3,
.instruction-copy p {
  margin: 0;
}

.instruction-copy p {
  color: var(--muted);
  line-height: 1.7;
}

.instruction-index {
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 12px;
}

@media (max-width: 640px) {
  .card {
    padding: 22px;
    border-radius: 20px;
  }

  .instruction-step {
    grid-template-columns: 1fr;
  }
}