:root {
  --canvas: #a9d4e8;
  --canvas-soft: #c6e8f4;
  --surface: rgba(235, 248, 252, 0.88);
  --line: rgba(84, 139, 163, 0.58);
  --ink: #365568;
  --ink-strong: #2f4d60;
  --ink-soft: #39596c;
  --accent: #f28773;
  --accent-strong: #b34835;
  --accent-ink: #172f3d;
  --white: #fff;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--canvas);
}

body {
  min-height: 100vh;
  margin: 0;
  padding: clamp(18px, 5vw, 48px) 16px;
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.5), transparent 34rem),
    linear-gradient(180deg, var(--canvas-soft), var(--canvas));
  color: var(--ink);
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  line-height: 1.5;
}

.link-hub {
  width: min(100%, 620px);
  margin: 0 auto;
  padding: clamp(22px, 5vw, 38px);
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--surface);
  box-shadow: 0 18px 42px rgba(57, 93, 114, 0.16);
}

.hub-header,
.external-links,
.link-group {
  display: grid;
  gap: 12px;
}

.hub-header {
  text-align: center;
}

.hub-logo {
  width: min(100%, 330px);
  height: auto;
  margin: 0 auto 4px;
}

.adult-label,
.section-label {
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  color: var(--ink-strong);
  font-family: "Bubblegum Sans", "Source Sans 3", sans-serif;
  font-size: clamp(2.15rem, 9vw, 3.35rem);
  line-height: 1;
}

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

.hub-link {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink-strong);
  font-size: 1.08rem;
  font-weight: 750;
  text-decoration: none;
  box-shadow: 0 7px 15px rgba(57, 93, 114, 0.08);
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.hub-link:hover {
  border-color: var(--accent-strong);
  box-shadow: 0 10px 20px rgba(57, 93, 114, 0.14);
  transform: translateY(-2px);
}

.hub-link:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 3px;
}

.hub-link-primary {
  margin-top: 8px;
  border-color: var(--accent-strong);
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 1.16rem;
}

.entry-note {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.uk-notice {
  margin: 26px 0;
  padding: 16px 18px;
  border-left: 5px solid var(--accent);
  border-radius: 12px;
  background: rgba(242, 135, 115, 0.11);
}

.uk-notice h2,
.link-group h2 {
  color: var(--ink-strong);
  font-size: 1rem;
}

.uk-notice p {
  margin-top: 6px;
}

.external-links {
  gap: 22px;
}

.link-group {
  gap: 9px;
}

.link-group h2 {
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 480px) {
  .link-hub {
    padding: 22px 16px;
    border-radius: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hub-link {
    transition: none;
  }
}