/* 实验中心 - experimental_center.html */

:root {
  --ec-text: #333333;
  --ec-text-muted: #666666;
  --ec-gray: #f4f4f4;
  --ec-font-section: clamp(24px, 2.083vw, 40px);
}

.site-main--ec {
  min-height: auto;
  overflow: hidden;
}

/* ========== Intro + center cards ========== */

.ec-intro {
  padding: clamp(56px, 5.208vw, 100px) 0 clamp(48px, 4.167vw, 80px);
  background: #ffffff;
  text-align: center;
}

.ec-intro__title {
  margin: 0;
  font-size: var(--ec-font-section);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ec-text);
}

.ec-intro__desc {
  margin: clamp(20px, 1.667vw, 32px) 0 0;
  font-size: clamp(14px, 0.9375vw, 18px);
  line-height: 1.9;
  color: var(--ec-text-muted);
  text-align: left;
}

.ec-intro__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(16px, 1.354vw, 26px);
  margin-top: clamp(40px, 3.333vw, 64px);
}

.ec-card {
  position: relative;
  margin: 0;
  min-width: 0;
  overflow: hidden;
}

.ec-card__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 380 / 420;
  object-fit: cover;
}

.ec-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 28%;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.55) 0%,
    rgba(0, 0, 0, 0.2) 55%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 1;
}

.ec-card__title {
  position: absolute;
  left: 0;
  right: 0;
  bottom: clamp(14px, 1.146vw, 22px);
  z-index: 2;
  margin: 0;
  padding: 0 clamp(8px, 0.833vw, 16px);
  font-size: clamp(14px, 0.9375vw, 18px);
  font-weight: 600;
  line-height: 1.4;
  color: #ffffff;
  text-align: center;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
}

/* ========== Alternating detail sections ========== */

.ec-detail {
  padding: clamp(48px, 4.167vw, 80px) 0;
  background: #ffffff;
}

.ec-detail--gray {
  background: var(--ec-gray);
}

.ec-detail__layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(32px, 4.167vw, 80px);
  align-items: center;
}

.ec-detail__layout--reverse {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
}

.ec-detail__layout--reverse .ec-detail__body {
  order: 2;
}

.ec-detail__layout--reverse .ec-detail__media {
  order: 1;
}

.ec-detail__title {
  margin: 0;
  font-size: var(--ec-font-section);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ec-text);
}

.ec-detail__desc {
  margin: clamp(16px, 1.25vw, 24px) 0 0;
  font-size: clamp(14px, 0.9375vw, 18px);
  line-height: 1.9;
  color: var(--ec-text-muted);
}

.ec-detail__media {
  min-width: 0;
}

.ec-detail__media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ========== Responsive ========== */

@media (max-width: 1100px) {
  .ec-intro__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .ec-detail__layout,
  .ec-detail__layout--reverse {
    grid-template-columns: 1fr;
    gap: clamp(24px, 4vw, 40px);
  }

  .ec-detail__layout--reverse .ec-detail__body,
  .ec-detail__layout--reverse .ec-detail__media {
    order: initial;
  }

  .ec-detail__media {
    order: -1;
  }
}

@media (max-width: 560px) {
  .ec-intro__grid {
    grid-template-columns: 1fr;
    max-width: 380px;
    margin-left: auto;
    margin-right: auto;
  }
}