* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #07111f, #0f172a);
  color: #e5eefc;
}
.app-shell {
  width: min(920px, 92vw);
  margin: 0 auto;
  padding: 32px 0;
}
.hero,
.card {
  background: rgba(15, 23, 42, 0.92);
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}
.hero {
  margin-bottom: 20px;
}
.eyebrow {
  margin: 0 0 8px;
  color: #60a5fa;
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
h1,
h2,
h3 {
  margin-top: 0;
}
h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 4vw, 3.2rem);
}
.description,
.section-heading p {
  margin: 0 0 20px;
  color: #cbd5e1;
  line-height: 1.7;
}
.hero-actions,
.form-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.primary-button,
.secondary-button,
.ghost-button,
.guest-form button {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
}
.primary-button,
.guest-form button {
  background: #2563eb;
  color: #fff;
}
.secondary-button {
  background: #14b8a6;
  color: #fff;
}
.ghost-button {
  background: transparent;
  border: 1px solid rgba(148, 163, 184, 0.6);
  color: #cbd5e1;
}
.primary-button:hover,
.guest-form button:hover,
.secondary-button:hover {
  filter: brightness(1.08);
}
.ghost-button:hover {
  background: rgba(148, 163, 184, 0.12);
}
.guest-form {
  display: grid;
  gap: 12px;
}
.guest-form label {
  display: grid;
  gap: 6px;
}
.guest-form input,
.guest-form textarea {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid #334155;
  background: #0b1220;
  color: #f8fafc;
}
.feedback {
  min-height: 1.5rem;
  margin: 12px 0 0;
  color: #7dd3fc;
}
.message-list-wrap {
  margin-top: 20px;
}
.message-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.message-list li {
  background: rgba(30, 41, 59, 0.72);
  border-radius: 12px;
  padding: 12px 14px;
}
.message-list strong {
  display: block;
  margin-bottom: 6px;
}
.message-list span {
  color: #cbd5e1;
  line-height: 1.6;
}
.empty-message {
  color: #cbd5e1;
}
@media (max-width: 640px) {
  .app-shell {
    width: min(96vw, 920px);
    padding: 18px 0;
  }
  .hero,
  .card {
    padding: 20px;
  }
}