/* ============================================================
   首页全宽图片轮播 — banner.css
   只维护 Banner 样式，公共导航/页脚在 style.css。
   图片：static/banner/banner1.png ... banner5.png
   文案：index.html 中 .series-banner-content（全轮播共用）。
   ============================================================ */

/* Banner 容器 */
.series-banner {
  position: relative;
  height: clamp(650px, 48vw, 780px);
  isolation: isolate;
  overflow: hidden;
  background: #dfeaf1;
}

/* 仅切换背景图：沿用 site.js 的 .series-slide / .is-active */
.series-slide {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  opacity: 0;
  visibility: hidden;
  transition: opacity .7s ease, visibility .7s ease;
}

.series-slide.is-active {
  opacity: 1;
  visibility: visible;
}

/* 后四张均以 banner1 为缺图回退，避免图片尚未放入时出现空白 */
.series-slide--colony {
  background-image: url("banner/banner1.png");
}
.series-slide--antimicrobial {
  background-image: url("banner/banner2.png"), url("banner/banner1.png");
}
.series-slide--algae {
  background-image: url("banner/banner3.png"), url("banner/banner1.png");
}
.series-slide--zooplankton {
  background-image: url("banner/banner4.png"), url("banner/banner1.png");
}
.series-slide--microscopy {
  background-image: url("banner/banner5.png"), url("banner/banner1.png");
}

/* 对图片稍作压暗，保证任何一张背景上的白字都清晰 */
.series-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(8, 28, 47, .22) 0%,
    rgba(8, 28, 47, .43) 57%,
    rgba(8, 28, 47, .40) 100%
  );
}

/* 全部图片共享这一组标题、描述、按钮 */
.series-banner-content {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 0;
  padding-bottom: 50px; /* 给底部轮播控制留空间 */
  color: #fff;
}

.series-banner-title {
  margin: 0;
  max-width: 1200px;
  font-size: clamp(30px, 3.1vw, 52px);
  line-height: 1.36;
  font-weight: 800;
  letter-spacing: -.035em;
  text-wrap: balance;
  text-shadow: 0 3px 20px rgba(7, 25, 42, .58);
}
.series-banner-title span {
  color: #E0092F;
}

.series-banner-subtitle {
  margin: 25px 0 35px;
  font-size: clamp(17px, 1.6vw, 24px);
  line-height: 1.65;
  font-weight: 550;
  color: #fff;
  text-shadow: 0 2px 15px rgba(7, 25, 42, .64);
}

/* 醒目的红色「了解详情」，定位到首页 #solutions */
.series-banner-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 50px;
  padding: 13px 28px;
  border: 1px solid #e0092f;
  border-radius: 9px;
  background: #e0092f;
  box-shadow: 0 12px 32px rgba(104, 7, 24, .25);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  transition: background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.series-banner-cta:hover {
  background: #bd0022;
  border-color: #bd0022;
  box-shadow: 0 16px 36px rgba(104, 7, 24, .30);
  transform: translateY(-2px);
}
.series-banner-cta svg {
  display: block;
  width: 17px;
  height: 17px;
}

/* 导航：保持原来的箭头、圆点、计数，与 site.js 兼容 */
.series-navigation {
  position: absolute;
  left: 50%;
  bottom: 27px;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 20px;
  transform: translateX(-50%);
}
.series-arrow {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid rgba(255,255,255,.58);
  border-radius: 50%;
  background: rgba(255,255,255,.16);
  color: #fff;
  font-size: 27px;
  line-height: 1;
  backdrop-filter: blur(6px);
  transition: background-color .2s, border-color .2s;
}
.series-arrow:hover {
  background: #e0092f;
  border-color: #e0092f;
}
.series-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}
.series-dot {
  width: 29px;
  height: 4px;
  padding: 0;
  border: 0;
  border-radius: 9px;
  background: rgba(255,255,255,.54);
  transition: width .25s, background-color .25s;
}
.series-dot.is-active {
  width: 45px;
  background: #e0092f;
}
.series-counter {
  position: absolute;
  right: 4vw;
  bottom: 31px;
  z-index: 3;
  color: rgba(255,255,255,.82);
  font-size: 13px;
  letter-spacing: .1em;
  text-shadow: 0 2px 12px rgba(0,0,0,.45);
}
.series-counter strong {
  color: #fff;
  font-size: 18px;
}

/* 不让粘性导航挡住「核心产品与解决方案」标题 */
#solutions { scroll-margin-top: 96px; }

@media (max-width: 760px) {
  .series-banner { height: 490px; }
  .series-slide { background-position: center; }
  .series-banner-content { padding-bottom: 44px; }
  .series-banner-title {
    max-width: 560px;
    font-size: clamp(27px, 6.3vw, 38px);
    line-height: 1.4;
  }
  .series-banner-subtitle {
    margin: 18px 0 26px;
    font-size: clamp(15px, 3.4vw, 19px);
  }
  .series-banner-cta { min-height: 45px; padding: 11px 24px; font-size: 14px; }
  .series-navigation { bottom: 22px; gap: 14px; }
  .series-arrow { width: 31px; height: 31px; }
  .series-dot { width: 22px; }
  .series-dot.is-active { width: 37px; }
  .series-counter { display: none; }
}

@media (max-width: 420px) {
  .series-banner { height: 460px; }
  .series-banner-title { font-size: 27px; }
  .series-banner-subtitle { font-size: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  .series-slide, .series-dot, .series-banner-cta { transition: none; }
}