/* ============================================================
   Section-4 客户的声音 — Swiper Coverflow 3D 轮播
   ────────────────────────────────────────────────
   - 用 Swiper 原生 coverflow 效果，CSS 只管视觉
   - 方形大头像（占卡片 58% 高度，人物介绍卡风）
   ============================================================ */

#section-4.home-section {
  position: relative;
  width: 100%;
  padding: clamp(80px, 8vw, 160px) 0;
  background: #0A1428;
  color: var(--text);
  overflow: hidden;
}

.section-4__bg-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
  pointer-events: none;
}

.section-4__bg-mask {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(10,20,40,.55) 0%, rgba(10,20,40,.7) 100%);
}

.section-4__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  min-width: 0;
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 clamp(24px, 4vw, 80px);
  box-sizing: border-box;
}

.section-4__head {
  text-align: center;
  margin-bottom: clamp(48px, 5vw, 96px);
}

.section-4__title {
  margin: 0;
  color: #F1F5F9;
  font-size: clamp(32px, 3.8vw, 64px);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0;
  text-shadow: 0 2px 16px rgba(0, 0, 0, .45), 0 1px 2px rgba(0, 0, 0, .35);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- 轮播容器 ---------- */

.section-4__carousel {
  position: relative;
  width: 100%;
  min-width: 0;
  padding: clamp(40px, 4vw, 80px) 0;
}

.section-4__swiper {
  position: relative;
  width: 100%;
  min-width: 0;
  overflow: visible; /* 让侧卡能伸出容器 */
  padding: clamp(24px, 2vw, 40px) 0;
}

.section-4__swiper .swiper-wrapper {
  align-items: center;
}

/* ---------- 卡片（Swiper slide）---------- */

.section-4__card {
  /* Swiper 用 slidesPerView:'auto' 时，slide 用自己的 width */
  width: clamp(260px, 24vw, 360px);
  height: clamp(380px, 36vw, 520px);
  flex-shrink: 0;
  cursor: pointer;
  /* 移除 opacity transition：与 Swiper transform 动画错位会造成卡顿
     侧卡用 rotate/scale/translateZ 已足够区分，不需要再叠加透明度变化 */
}

.section-4__card.swiper-slide-active {
  cursor: default;
}

.section-4__card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  border-radius: clamp(20px, 1.6vw, 28px);
  background: linear-gradient(170deg, #FFFFFF 0%, #F2F7FC 100%);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 20px 50px rgba(10, 20, 40, 0.18),
    0 8px 20px rgba(56, 189, 248, 0.08);
  overflow: hidden;
}

/* 中央卡片：顶部蓝色高亮线 */
.section-4__card-inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 56%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--main), transparent);
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity .55s var(--ease);
  z-index: 2;
}

.section-4__card.swiper-slide-active .section-4__card-inner::before {
  opacity: 1;
}

/* 头像区：方形圆角，占卡片上半部 */
.section-4__card-avatar {
  position: relative;
  width: 100%;
  height: 58%;
  flex: 0 0 58%;
  overflow: hidden;
  background: linear-gradient(135deg, #38BDF8 0%, #6BB4FF 100%);
}

.section-4__card-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.section-4__card-avatar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 30%;
  background: linear-gradient(to top, rgba(242, 247, 252, 0.7), transparent);
  pointer-events: none;
}

/* 文字区 */
.section-4__card-quote {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: clamp(18px, 1.6vw, 28px) clamp(20px, 1.8vw, 28px) clamp(10px, .8vw, 14px);
  font-size: clamp(14px, 1vw, 17px);
  line-height: 1.45;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.section-4__card-name {
  margin: auto 0 clamp(2px, .25vw, 4px);
  padding: 0 clamp(20px, 1.8vw, 28px);
  font-size: clamp(15px, 1.05vw, 18px);
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0;
}

.section-4__card-role {
  margin: 0;
  padding: 0 clamp(20px, 1.8vw, 28px) clamp(18px, 1.6vw, 26px);
  font-size: clamp(12px, .9vw, 14px);
  font-weight: 400;
  color: rgba(10, 20, 40, 0.55);
  letter-spacing: 0;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1023px) {
  .section-4__card {
    width: clamp(240px, 46vw, 320px);
    height: clamp(360px, 68vw, 480px);
  }
}

@media (max-width: 599px) {
  .section-4__inner { padding: 0; }
  .section-4__card {
    width: 72vw;
    max-width: 300px;
    height: 110vw;
    max-height: 460px;
  }
  .section-4__card-quote { font-size: clamp(14px, 4vw, 16px); }
}

/* ---------- 减弱动画 ---------- */

@media (prefers-reduced-motion: reduce) {
  .section-4__card {
    transition: none !important;
  }
}