:root {
  --color-bg-top: #f7f7f7;
  --color-bg-mid: #d6d6d6;
  --color-bg-bottom: #a8a8a8;
  --color-card: #ffffff;
  --color-text: #111111;
  --color-muted: #474747;
  --color-border: #e6e6e6;
  --color-link-bg: #f8f8f8;
  --color-link-bg-hover: #efefef;
  --color-focus: #111111;
  --shadow-soft: 0 12px 28px rgba(0, 0, 0, 0.08);
}

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

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

body {
  font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--color-text);
  background: linear-gradient(
    180deg,
    var(--color-bg-top) 0%,
    var(--color-bg-mid) 55%,
    var(--color-bg-bottom) 100%
  );
  line-height: 1.45;
}

.hub-page {
  min-height: 100vh;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hub-card {
  width: 100%;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 1.25rem 1rem;
  box-shadow: var(--shadow-soft);
  margin-top: auto;
}

.hub-header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.hub-logo {
  width: min(100%, 260px);
  height: auto;
  display: block;
  margin: 0 auto 1rem;
}

.hub-header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}

.hub-header p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.98rem;
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.link-item {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.8rem;
  width: 100%;
  min-height: 3.25rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 0.8rem;
  background: var(--color-link-bg);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  text-align: center;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.link-thumb {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 50%;
  object-fit: cover;
  flex: 0 0 2.6rem;
  border: 1px solid var(--color-border);
}

.link-text {
  flex: 1;
  text-align: left;
}

.link-item:hover {
  background: var(--color-link-bg-hover);
}

.link-item:active {
  transform: translateY(1px);
}

.link-item:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

.hub-footer {
  margin-top: auto;
  padding-top: 1rem;
  padding-bottom: 0.15rem;
  text-align: center;
}

.footer-link {
  color: #2f2f2f;
  font-size: 0.88rem;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.footer-link:hover {
  color: #111111;
}

.footer-link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 0.2rem;
}

@media (min-width: 640px) {
  .hub-page {
    padding: 2rem 1.5rem;
  }

  .hub-card {
    max-width: 680px;
    border-radius: 1.25rem;
    padding: 2rem;
  }

  .hub-logo {
    width: min(100%, 340px);
    margin-bottom: 1.25rem;
  }

  .hub-header h1 {
    font-size: 1.6rem;
  }

  .hub-header p {
    font-size: 1.03rem;
  }

  .link-list {
    gap: 0.9rem;
  }

  .link-item {
    min-height: 3.5rem;
    font-size: 1.02rem;
    gap: 0.95rem;
    padding: 0.55rem 1rem;
  }

  .link-thumb {
    width: 2.85rem;
    height: 2.85rem;
    flex-basis: 2.85rem;
  }

  .hub-footer {
    padding-top: 1.2rem;
    padding-bottom: 0.25rem;
  }

  .footer-link {
    font-size: 0.92rem;
  }
}