:root {
  color-scheme: light;
  --hub-bg: #f5efe4;
  --hub-ink: #1f1814;
  --hub-muted: rgba(31, 24, 20, 0.66);
  --hub-line: rgba(31, 24, 20, 0.08);
  --hub-sbti: #bc5f3b;
  --hub-cat: #c88f2b;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(188, 95, 59, 0.16), transparent 36%),
    radial-gradient(circle at bottom right, rgba(200, 143, 43, 0.18), transparent 34%),
    linear-gradient(135deg, #f9f4ea 0%, #f2eadc 46%, #e8decd 100%);
  color: var(--hub-ink);
}

.quiz-hub-body {
  position: relative;
  overflow-x: hidden;
}

.hub-noise,
.hub-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.hub-noise {
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(circle at center, black, transparent 78%);
}

.hub-glow-a {
  background: radial-gradient(circle at 18% 20%, rgba(188, 95, 59, 0.22), transparent 34%);
}

.hub-glow-b {
  background: radial-gradient(circle at 82% 76%, rgba(200, 143, 43, 0.22), transparent 30%);
}

.hub-shell {
  position: relative;
  min-height: 100vh;
  padding: 48px 24px 64px;
}

.hub-header {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}

.hub-kicker {
  margin: 0 0 18px;
  font-size: 0.9rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(31, 24, 20, 0.52);
}

.hub-header h1 {
  margin: 0;
  font-size: clamp(2.6rem, 5vw, 5.6rem);
  line-height: 0.96;
  letter-spacing: -0.06em;
}

.hub-copy {
  margin: 18px auto 0;
  max-width: 620px;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--hub-muted);
}

.hub-grid {
  width: min(1120px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.hub-card {
  position: relative;
  display: grid;
  align-content: space-between;
  min-height: 420px;
  padding: 28px;
  border: 1px solid var(--hub-line);
  border-radius: 28px;
  overflow: hidden;
  background: rgba(255, 250, 243, 0.76);
  backdrop-filter: blur(18px);
  box-shadow: 0 24px 60px rgba(31, 24, 20, 0.09);
  transition:
    transform 260ms ease,
    box-shadow 260ms ease,
    border-color 260ms ease;
}

.hub-card::before {
  content: "";
  position: absolute;
  inset: auto -12% -40% 44%;
  height: 240px;
  border-radius: 50%;
  opacity: 0.85;
}

.hub-card-sbti::before {
  background: radial-gradient(circle, rgba(188, 95, 59, 0.24), transparent 70%);
}

.hub-card-cat::before {
  background: radial-gradient(circle, rgba(200, 143, 43, 0.28), transparent 70%);
}

.hub-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 30px 72px rgba(31, 24, 20, 0.13);
}

.hub-card-topline,
.hub-card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.hub-card-code {
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.hub-card-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(31, 24, 20, 0.06);
  color: rgba(31, 24, 20, 0.72);
  font-size: 0.82rem;
}

.hub-card-body {
  position: relative;
  z-index: 1;
}

.hub-card-body h2 {
  margin: 20px 0 14px;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.hub-card-body p {
  margin: 0;
  max-width: 28rem;
  line-height: 1.78;
  color: var(--hub-muted);
}

.hub-card-meta {
  position: relative;
  z-index: 1;
  justify-content: flex-start;
  gap: 10px;
  margin-top: 26px;
}

.hub-card-meta span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid rgba(31, 24, 20, 0.08);
  background: rgba(255, 255, 255, 0.34);
  font-size: 0.88rem;
}

.hub-card-link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-width: 160px;
  min-height: 54px;
  margin-top: 32px;
  padding: 0 22px;
  border-radius: 999px;
  text-decoration: none;
  color: white;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hub-card-sbti .hub-card-code,
.hub-card-sbti .hub-card-link {
  color: white;
}

.hub-card-sbti .hub-card-link {
  background: linear-gradient(135deg, #bc5f3b, #8a3e22);
}

.hub-card-cat .hub-card-link {
  background: linear-gradient(135deg, #d39d34, #a96f19);
}

@media (max-width: 860px) {
  .hub-shell {
    padding: 28px 16px 40px;
  }

  .hub-grid {
    grid-template-columns: 1fr;
  }

  .hub-card {
    min-height: 360px;
    padding: 22px;
    border-radius: 24px;
  }

  .hub-card-body h2 {
    margin-top: 12px;
  }
}