@charset "utf-8";
/* =============================================================
   首页 Banner 主/副标题层  bn-
   仅作用于 #banner 内部，不影响主题其它模块
   ============================================================= */

#banner {
  position: relative;
}

#banner .swiper-slide {
  position: relative;
  overflow: hidden;
}

/* 图片层：保持原有“图片宽度100%、高度自适应”的行为 */
#banner .bn-media {
  position: relative;
  overflow: hidden;
  line-height: 0;
}

#banner .bn-media img {
  display: block;
  width: 100%;
  height: auto;
}

/* 压暗层：左侧重、右侧轻，保证白字在亮天空上也够清晰 */
#banner .bn-shade {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  pointer-events: none;
  background:
    linear-gradient(97deg, rgba(4, 12, 26, .88) 0%, rgba(4, 12, 26, .72) 28%, rgba(4, 12, 26, .30) 54%, rgba(4, 12, 26, 0) 76%),
    linear-gradient(to top, rgba(4, 12, 26, .55) 0%, rgba(4, 12, 26, 0) 26%);
}

/* 文字层 */
#banner .bn-wrap {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 5;
  display: flex;
  flex-direction: row;
  align-items: center;
  /* 底部蓝色搜索条压住 banner 60px，文字整体上移避开 */
  padding-bottom: 60px;
  pointer-events: none;
}

/* 整张图可点击（后台“链接”为空时自动隐藏这层） */
#banner .bn-cover {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 3;
  display: block;
}

#banner .bn-cover[href=""],
#banner .bn-cover[href="#"],
#banner .bn-cover[href="/"] {
  display: none;
}

/* 文字不挡点击，只有按钮自己可点 */
#banner .bn-text {
  max-width: 660px;
  pointer-events: none;
}

#banner .bn-btn {
  pointer-events: auto;
}

#banner .bn-line {
  display: block;
  width: 54px;
  height: 3px;
  border-radius: 3px;
  margin: 0 0 22px;
  background: linear-gradient(90deg, #056ede 0%, #4ea6ff 100%);
  box-shadow: 0 0 18px rgba(78, 166, 255, .55);
}

#banner .bn-title {
  margin: 0;
  padding: 0;
  font-size: 48px;
  line-height: 1.26;
  font-weight: 800;
  letter-spacing: .02em;
  color: #fff;
  text-shadow: 0 6px 30px rgba(0, 0, 0, .42);
  text-wrap: balance;
}

#banner .bn-sub {
  margin: 20px 0 0;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.95;
  color: rgba(255, 255, 255, .88);
  text-shadow: 0 2px 12px rgba(0, 0, 0, .55);
  text-wrap: balance;
}

#banner .bn-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  height: 48px;
  padding: 0 28px;
  margin-top: 30px;
  border-radius: 3px;
  background: #056ede;
  color: #fff;
  font-size: 15px;
  letter-spacing: .06em;
  text-decoration: none;
  box-shadow: 0 12px 28px rgba(5, 110, 222, .35);
  transition: background .35s ease, box-shadow .35s ease, transform .35s ease;
}

#banner .bn-btn:hover {
  background: #0b7cf5;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(5, 110, 222, .46);
}

#banner .bn-arrow {
  width: 7px;
  height: 7px;
  border-top: 2px solid #fff;
  border-right: 2px solid #fff;
  transform: rotate(45deg);
  transition: transform .35s ease;
}

#banner .bn-btn:hover .bn-arrow {
  transform: rotate(45deg) translate(3px, -3px);
}

/* 切换动画：只在当前张播放；未初始化 swiper（无 JS）时文字保持可见 */
#banner .swiper-container-initialized .swiper-slide .bn-text > * {
  opacity: 0;
}

#banner .swiper-container-initialized .swiper-slide.swiper-slide-active .bn-text > * {
  animation: bnUp .85s cubic-bezier(.2, .65, .3, 1) both;
}

#banner .swiper-slide-active .bn-text > *:nth-child(1) { animation-delay: .05s; }
#banner .swiper-slide-active .bn-text > *:nth-child(2) { animation-delay: .16s; }
#banner .swiper-slide-active .bn-text > *:nth-child(3) { animation-delay: .28s; }
#banner .swiper-slide-active .bn-text > *:nth-child(4) { animation-delay: .40s; }

#banner .swiper-slide-active .bn-media img {
  animation: bnZoom 9s ease-out both;
}

@keyframes bnUp {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes bnZoom {
  from { transform: scale(1.06); }
  to   { transform: scale(1); }
}

/* 轮播按钮：压在文字层之上（原样式 z-index:10 已够，这里只保证可点） */
#banner .swiper-button {
  z-index: 20;
}

/* ---------------- 平板 ---------------- */
@media screen and (max-width: 1200px) {
  #banner .bn-title { font-size: 40px; }
  #banner .bn-text { max-width: 600px; }
}

/* ---------------- 手机/小平板 ---------------- */
@media screen and (max-width: 990px) {
  /* 图片改为铺满固定高度，避免窄屏高度被压成一条 */
  #banner .swiper-slide {
    height: 62vw;
    min-height: 300px;
    max-height: 430px;
  }

  #banner .bn-media {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
  }

  #banner .bn-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 58% center;
  }

  #banner .bn-shade {
    background:
      linear-gradient(105deg, rgba(4, 12, 26, .88) 0%, rgba(4, 12, 26, .64) 42%, rgba(4, 12, 26, .26) 100%),
      linear-gradient(to top, rgba(4, 12, 26, .35) 0%, rgba(4, 12, 26, 0) 22%);
  }

  #banner .bn-wrap {
    padding-bottom: 60px;
  }

  #banner .bn-inner {
    padding-left: 20px;
    padding-right: 20px;
  }

  #banner .bn-line {
    width: 38px;
    height: 3px;
    margin-bottom: 14px;
  }

  #banner .bn-title {
    font-size: clamp(21px, 3.5vw, 30px);
    line-height: 1.36;
    letter-spacing: 0;
  }

  #banner .bn-sub {
    margin-top: 12px;
    font-size: clamp(12px, 1.7vw, 14px);
    line-height: 1.75;
    max-width: none;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  #banner .bn-btn {
    height: 38px;
    padding: 0 18px;
    margin-top: 18px;
    font-size: 13px;
    gap: 8px;
  }
}

@media screen and (max-width: 768px) {
  /* 搜索条在手机端不再压住 banner */
  #banner .bn-wrap {
    padding-bottom: 16px;
  }

  #banner .swiper-slide {
    height: 340px;
    min-height: 0;
  }

  #banner .bn-sub {
    -webkit-line-clamp: 2;
  }
}

@media screen and (max-width: 480px) {
  #banner .swiper-slide {
    height: 320px;
  }

  #banner .bn-title {
    font-size: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #banner .swiper-container-initialized .swiper-slide .bn-text > *,
  #banner .swiper-container-initialized .swiper-slide.swiper-slide-active .bn-text > *,
  #banner .swiper-slide-active .bn-media img {
    animation: none;
  }

  #banner .swiper-container-initialized .swiper-slide .bn-text > * {
    opacity: 1;
  }
}