:root {
  color-scheme: dark;
  --bg: #070b14;
  --bg2: #0c1220;
  --panel: rgba(14, 20, 35, 0.82);
  --line: rgba(255, 255, 255, 0.12);
  --text: #eef2ff;
  --muted: #a9b3d1;
  --accent: #72d7ff;
  --accent2: #8ef0c8;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Segoe UI", "Inter", system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(114, 215, 255, 0.18), transparent 30%),
    radial-gradient(circle at top right, rgba(142, 240, 200, 0.12), transparent 26%),
    linear-gradient(180deg, var(--bg), var(--bg2));
}

.shell {
  max-width: 1040px;
  margin: 0 auto;
  padding: 56px 24px 72px;
  display: grid;
  gap: 20px;
}

.hero, .panel {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(10px);
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
}

.hero {
  padding: 44px;
}

.badge {
  display: inline-flex;
  padding: 8px 12px;
  border: 1px solid rgba(114, 215, 255, 0.35);
  border-radius: 999px;
  color: var(--accent);
  background: rgba(114, 215, 255, 0.08);
  font-size: 14px;
  letter-spacing: 0.04em;
}

h1 {
  margin: 18px 0 12px;
  font-size: clamp(40px, 7vw, 72px);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.lead {
  max-width: 720px;
  margin: 0;
  font-size: 18px;
  line-height: 1.6;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.disabled {
  pointer-events: none;
  opacity: 0.65;
}

.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #07111b;
}

.secondary {
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.hint {
  margin: 18px 0 0;
  color: var(--muted);
}

.panel {
  padding: 28px 32px;
}

.panel h2 {
  margin: 0 0 16px;
  font-size: 20px;
}

ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.75;
}

.mono {
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
}

code {
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

@media (max-width: 720px) {
  .shell {
    padding: 20px 14px 40px;
  }

  .hero, .panel {
    border-radius: 18px;
  }

  .hero {
    padding: 28px 22px;
  }

  .panel {
    padding: 22px;
  }
}