:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-dark: #0284c7;
  --success: #22c55e;
  --error: #ef4444;
  --radius: 16px;
  --shadow: 0 20px 40px rgba(15, 23, 42, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top, #1e293b 0%, var(--bg) 55%);
  color: var(--text);
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  width: min(100%, 440px);
  background: rgba(30, 41, 59, 0.92);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px 28px;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

h1 {
  margin: 0 0 12px;
  font-size: 1.75rem;
  line-height: 1.2;
}

.message {
  margin: 0 0 28px;
  color: var(--muted);
  line-height: 1.6;
  font-size: 1rem;
}

.qr-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

.qr-frame {
  background: #ffffff;
  padding: 18px;
  border-radius: 20px;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.08);
}

.qr-frame canvas,
.qr-frame img {
  display: block;
  width: 220px;
  height: 220px;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.link-preview {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.55);
  font-size: 0.85rem;
  word-break: break-all;
}

.link-preview a {
  color: var(--accent);
  text-decoration: underline;
}

.status {
  margin-top: 16px;
  min-height: 1.25rem;
  font-size: 0.9rem;
}

.status.error {
  color: var(--error);
}

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

.loading {
  color: var(--muted);
}

/* Admin page */
.admin-card {
  width: min(100%, 560px);
  text-align: left;
}

.admin-card h1 {
  text-align: center;
}

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  font-weight: 600;
}

.field input,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(15, 23, 42, 0.65);
  color: var(--text);
  font: inherit;
}

.field textarea {
  min-height: 96px;
  resize: vertical;
}

.field input:focus,
.field textarea:focus {
  outline: 2px solid rgba(56, 189, 248, 0.35);
  border-color: var(--accent);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #082f49;
}

button.secondary {
  background: rgba(148, 163, 184, 0.15);
  color: var(--text);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.meta {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(148, 163, 184, 0.15);
  color: var(--muted);
  font-size: 0.85rem;
}

.back-link {
  display: inline-block;
  margin-top: 18px;
  color: var(--accent);
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  .card {
    padding: 24px 18px;
  }

  h1 {
    font-size: 1.5rem;
  }

  .qr-frame canvas,
  .qr-frame img {
    width: 200px;
    height: 200px;
  }
}