:root {
  color-scheme: dark;
  --color-page-bg: #222222;
  --color-surface: #1a1a1a;
  --color-card-bg: #202020;
  --color-card-bg-hover: #262626;
  --color-border: #333333;
  --color-text: #e0e0e0;
  --color-text-muted: #8f8f8f;
  --color-accent: #86b095;
  --color-link: #8cb4ff;
  --shadow-surface: 0 16px 32px rgba(0, 0, 0, 0.2);
  --font-mono:
    "JetBrains Mono", "Fira Code", "Cascadia Code", "Consolas",
    "Liberation Mono", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  min-height: 100dvh;
  padding: 1.5rem;
  background-color: var(--color-page-bg);
  color: var(--color-text);
  font-family: var(--font-mono);
}

a {
  color: inherit;
  text-decoration: none;
}

::selection {
  background-color: rgba(140, 180, 255, 0.18);
  color: var(--color-text);
}

.hub-shell {
  width: min(100%, 28rem);
  margin: 0 auto;
  min-height: calc(100dvh - 3rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.hub-card {
  padding: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: 0.85rem;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-surface);
}

.hub-kicker {
  margin: 0 0 1rem;
  color: var(--color-accent);
  font-size: 1.1rem;
}

.hub-title {
  margin: 0;
  font-size: clamp(2rem, 7vw, 2.5rem);
  font-weight: 400;
}

.hub-summary {
  margin: 0.75rem 0 0;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.hub-link-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hub-link {
  display: block;
  padding: 0.9rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0.6rem;
  background-color: var(--color-card-bg);
  color: var(--color-link);
  font-size: 1.15rem;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.hub-link:hover,
.hub-link:focus-visible {
  background-color: var(--color-card-bg-hover);
  border-color: rgba(140, 180, 255, 0.28);
  color: #a8c5ff;
  outline: none;
  transform: translateY(-1px);
}

@media (max-width: 640px) {
  body {
    padding: 1rem;
  }

  .hub-shell {
    min-height: calc(100dvh - 2rem);
  }

  .hub-card {
    padding: 1rem;
    border-radius: 0.75rem;
  }

  .hub-kicker {
    margin-bottom: 0.85rem;
  }

  .hub-link {
    font-size: 1.05rem;
  }
}