/**
 * Homepage certifications (template/01/pc/index.htm)
 * Desktop / tablet: 4-up or 2-up grid via display:contents on slides.
 * Mobile (≤767px): horizontal carousel, 2 certificates per slide.
 * Typography: main heading matches .about-title; captions under images slightly smaller.
 */

.certifications-section {
  --cert-navy: #1a2744;
  --cert-gold: #b8956a;
  --cert-card-bg: linear-gradient(165deg, #ffffff 0%, #f4f6f9 100%);
  --cert-card-border: rgba(26, 39, 68, 0.08);
  --cert-card-shadow: 0 10px 32px rgba(26, 39, 68, 0.09);
  --cert-card-shadow-hover: 0 18px 44px rgba(26, 39, 68, 0.14);
  /* 与 About 均为白底，不再加底部分割条 */
  padding: 76px 0 0;
  background: linear-gradient(180deg, #fafbfc 0%, #ffffff 42%);
}

.certifications-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.certifications-header {
  text-align: center;
  margin-bottom: 1.75rem;
}

/* Main heading: same scale as homepage .about-title (aoxiang-home.css); spans inherit (see below) vs aoxiang-base span rule */
.certifications-section h2.certifications-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 22px;
  line-height: 1.2;
  font-family: 'Oswald', Helvetica, Arial, sans-serif;
  letter-spacing: 0.02em;
  position: relative;
  padding-bottom: 0.55rem;
}

.certifications-section h2.certifications-title::after {
  content: '';
  display: block;
  width: 3.5rem;
  height: 3px;
  margin: 0.65rem auto 0;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--cert-gold), transparent);
  opacity: 0.9;
}

@media (max-width: 1024px) {
  .certifications-section h2.certifications-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 768px) {
  .certifications-section h2.certifications-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 767px) {
  .certifications-section h2.certifications-title {
    font-size: clamp(1.5rem, 4.2vw, 1.85rem);
    line-height: 1.22;
    margin-bottom: 0.65rem;
  }
}

@media (max-width: 480px) {
  .certifications-section h2.certifications-title {
    font-size: 1.45rem;
    margin-bottom: 0.5rem;
  }
}

/* Spans must inherit h2 size: aoxiang-base.css `body :where(span){ font-size }` otherwise locks title text to 14–16px */
.certifications-section h2.certifications-title .certifications-title-our,
.certifications-section h2.certifications-title .certifications-title-accent {
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
}

.certifications-title-our {
  color: var(--cert-navy);
}

.certifications-title-accent {
  color: var(--cert-gold);
  margin-left: 0.35em;
}

/* Slides flatten into parent grid on desktop / tablet */
.certifications-slide {
  display: contents;
}

.certifications-carousel {
  width: 100%;
}

.certifications-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.35rem 1.35rem;
  align-items: stretch;
  margin-inline: auto;
  max-width: 1000px;
}

/* PC：首页资质独立版心 1400px，证书栅格铺满版心 */
@media (min-width: 992px) {
  .certifications-inner {
    max-width: 1400px;
  }

  .certifications-grid {
    max-width: none;
  }
}

.certifications-item {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-width: 0;
  padding: 0.85rem 0.75rem 1rem;
  background: var(--cert-card-bg);
  border-radius: 14px;
  border: 1px solid var(--cert-card-border);
  box-shadow: var(--cert-card-shadow);
  transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}

@media (hover: hover) {
  .certifications-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--cert-card-shadow-hover);
    border-color: rgba(184, 149, 106, 0.4);
  }
}

.certifications-item__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(26, 39, 68, 0.05);
  border: none;
}

.certifications-item__caption {
  margin: 0;
  padding: 0;
  text-align: center;
}

.certifications-section .certifications-item__title {
  font-family: var(--font-family-sans, 'Oswald', Helvetica, Arial, sans-serif);
  font-size: calc(var(--font-size-h4-mobile) - 3px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--cert-navy);
  margin: 0;
  text-align: center;
  letter-spacing: 0.04em;
  text-transform: none;
}

.certifications-carousel-dots {
  display: none;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-top: 1.25rem;
}

.certifications-carousel-dots.is-visible {
  display: flex;
}

.certifications-carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 0;
  padding: 0;
  background: #c5cdd8;
  cursor: pointer;
  transition: background 0.22s ease, transform 0.22s ease, width 0.22s ease, border-radius 0.22s ease;
}

.certifications-carousel-dot.is-active {
  background: var(--cert-navy);
  width: 26px;
  border-radius: 999px;
  transform: none;
}

.certifications-carousel-dot:focus-visible {
  outline: 2px solid var(--cert-gold);
  outline-offset: 3px;
}

@media (min-width: 1024px) {
  .certifications-section .certifications-item__title {
    font-size: calc(var(--font-size-h4-desktop) - 4px);
  }
}

@media (max-width: 991px) and (min-width: 768px) {
  .certifications-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem 1.25rem;
    max-width: 640px;
  }
}

@media (max-width: 767px) {
  .certifications-header {
    margin-bottom: 1.25rem;
  }

  .certifications-slide {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem;
    flex: 0 0 100%;
    width: 100%;
    min-width: 0;
    scroll-snap-align: start;
    scroll-snap-stop: always;
  }

  .certifications-grid {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 14px;
    max-width: none;
    width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    padding: 4px 2px 10px;
  }

  .certifications-item {
    gap: 0.65rem;
    padding: 0.65rem 0.55rem 0.85rem;
  }
}

@media (max-width: 480px) {
  .certifications-section {
    padding: 40px 0 0;
  }

  .certifications-section h2.certifications-title::after {
    width: 2.75rem;
    height: 2px;
    margin-top: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .certifications-item,
  .certifications-carousel-dot {
    transition: none;
  }

  @media (hover: hover) {
    .certifications-item:hover {
      transform: none;
    }
  }
}