:root {
  color-scheme: dark;
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #06101f;
  color: #edf8ff;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 10%, rgba(45, 212, 255, 0.2), transparent 28%),
    radial-gradient(circle at 86% 18%, rgba(255, 186, 73, 0.12), transparent 24%),
    linear-gradient(135deg, #06101f, #020711);
}

button,
input {
  font: inherit;
}

.shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0;
}

.hero {
  margin-bottom: 24px;
}

.hero span {
  color: #4cc9f0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 800;
  font-size: 12px;
}

.hero h1 {
  margin: 8px 0;
  font-size: clamp(36px, 6vw, 72px);
  line-height: 1;
}

.hero p {
  color: #a9bed1;
}

.panel {
  margin-top: 18px;
  padding: 20px;
  border: 1px solid rgba(76, 201, 240, 0.25);
  background: rgba(4, 14, 30, 0.78);
  clip-path: polygon(18px 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.panel h2 {
  margin: 0 0 16px;
}

input {
  min-height: 40px;
  border: 1px solid rgba(76, 201, 240, 0.3);
  background: #071426;
  color: #edf8ff;
  padding: 0 12px;
}

.package-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.package-card {
  padding: 18px;
  border: 1px solid rgba(255, 186, 73, 0.25);
  background: linear-gradient(135deg, rgba(76, 201, 240, 0.08), rgba(255, 186, 73, 0.08));
}

.package-card span {
  color: #4cc9f0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.package-card h3 {
  margin: 10px 0;
}

.package-card strong {
  font-size: 28px;
  color: #ffcf70;
}

.package-card p {
  color: #a9bed1;
}

button {
  min-height: 42px;
  border: 0;
  padding: 0 16px;
  color: #03101c;
  font-weight: 800;
  background: linear-gradient(100deg, #4cc9f0, #ffcf70);
  cursor: pointer;
}

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

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

pre {
  min-height: 220px;
  overflow: auto;
  padding: 14px;
  border: 1px solid rgba(76, 201, 240, 0.18);
  background: rgba(0, 0, 0, 0.24);
  color: #dff7ff;
}

@media (max-width: 820px) {
  .panel-head,
  .two-col {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }
}