/* ==========================================================================
   sponsors.css — #sponsors
   協賛CTA + ロゴグリッド
   ========================================================================== */

.opg-sponsors {
  background: var(--opg-paper);
  position: relative;
}

.opg-sponsors__row {
  position: relative;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: center;
  padding: clamp(32px, 5vw, 64px);
  border-radius: var(--opg-radius-xl);
  background:
    linear-gradient(120deg,
      oklch(94% 0.08 25) 0%,
      oklch(95% 0.07 90) 30%,
      oklch(95% 0.07 200) 65%,
      oklch(93% 0.08 320) 100%);
  overflow: hidden;
  border: 1px solid var(--opg-border);
}
.opg-sponsors__row::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 80% 30%, oklch(70% 0.2 30 / 0.18), transparent 60%),
    radial-gradient(ellipse at 20% 70%, oklch(60% 0.2 280 / 0.18), transparent 60%);
  pointer-events: none;
}
.opg-sponsors__row > * { position: relative; }
@media (max-width: 880px) {
  .opg-sponsors__row { grid-template-columns: 1fr; gap: 32px; }
}

.opg-sponsors__title {
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 16px 0;
}
.opg-sponsors__title-accent {
  background: var(--opg-grad-rainbow);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.opg-sponsors__cta {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
}