/* 競賽組別 */
.categories {
  position: relative;
  z-index: 1;
  width: 100%;
  padding: clamp(3rem, 8vw, 10rem) clamp(1.25rem, 4vw, 5rem);
  overflow-x: clip;
}

.categories::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1px 1px at 78% 12%, rgba(120, 180, 255, 0.45), transparent),
    radial-gradient(1px 1px at 34% 72%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(1px 1px at 88% 68%, rgba(255, 120, 180, 0.35), transparent);
}

.categories__inner {
  position: relative;
  z-index: 1;
  max-width: 80rem;
  margin: 0 auto;
}

.categories__head {
  margin-bottom: clamp(2rem, 5vw, 3rem);
  text-align: center;
}

.categories__title {
  margin: 0 0 1rem;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.4;
  color: #fff;
}

.categories__line {
  display: block;
  width: min(7.5rem, 40%);
  height: 3px;
  margin: 0 auto;
  border: none;
  border-radius: 999px;
  background: linear-gradient(90deg, #ff6900 0%, #fe9a00 100%);
}

.categories__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: clamp(0.875rem, 2vw, 1.25rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.categories__item {
  display: flex;
  flex: 0 1 calc(25% - 0.9375rem);
  max-width: calc(25% - 0.9375rem);
  min-width: 0;
}

.categories__card {
  display: grid;
  grid-template-rows: auto 1fr;
  width: 100%;
  min-height: 100%;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid #FFFFFF1A;
  background: #FFFFFF0D;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.2s ease;
}

.categories__card:hover {
  border-color: rgba(255, 255, 255, 0.18);
}

.categories__card:focus-visible {
  outline: 2px solid #2b7fff;
  outline-offset: 2px;
}

.categories__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 100%;
  height: clamp(8rem, 22vw, 14.5rem);
  padding: clamp(1rem, 2.5vw, 1.5rem);
  box-sizing: border-box;
}

.categories__visual--comic {
  background: #8097F7;
}

.categories__visual--image {
  background: #3972C1;
}

.categories__visual--video {
  background: #469BDC;
}

.categories__visual--music {
  background: #88C7F2;
}

.categories__icon {
  display: block;
  width: auto;
  height: auto;
  max-width: 72%;
  max-height: 100%;
  object-fit: contain;
  object-position: center;
}

.categories__body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: clamp(1rem, 2.5vw, 1.25rem) clamp(0.875rem, 2vw, 1rem);
  padding-bottom: clamp(1.5rem, 2.5vw, 2.25rem);
  text-align: center;
}

.categories__name {
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  font-weight: 700;
  line-height: 1.45;
  color: #fff;
}

.categories__desc {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.55);
}

@media (max-width: 768px) {
  .categories__item {
    flex: 0 1 calc(50% - 0.625rem);
    max-width: calc(50% - 0.625rem);
  }

  .categories__visual {
    height: clamp(8rem, 40vw, 10rem);
  }
}

@media (max-width: 420px) {
  .categories__item {
    flex: 0 1 100%;
    max-width: 22rem;
  }
}