/* =============================
   WHAT IS VEX 页面专用样式
   ============================= */

/* 第一屏整体容器（Hero + Intro） */
.wiv-fold {
  width: 100vw;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

main {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
}

/* --------------------------------------
   Hero 区块（上半部分）
--------------------------------------- */
.wiv-hero {
  flex: 0 0 42vh;
  background: #7a001f;
  color: #f9fafb;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.wiv-inner {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

.wiv-hero-title {
  margin-top: 8vh;
  font-size: clamp(2.6rem, 3vw + 1.4rem, 3.4rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 0.6rem;
}

.wiv-hero-subtitle {
  font-size: 1.05rem;
  max-width: 560px;
  color: #e5e7eb;
  line-height: 1.7;
}

/* --------------------------------------
   Intro 区块（下半部分）
--------------------------------------- */
.wiv-intro {
  flex: 1;
  background: #ffffff;
  display: flex;
  align-items: center;
  padding: 3.5rem 0;
}

.wiv-split {
  display: flex;
  gap: 3rem;
  align-items: center;
}

.wiv-split-text {
  flex: 1.1;
  font-size: 1rem;
  line-height: 1.8;
  color: #111827;
}

.wiv-split-text p + p {
  margin-top: 0.9rem;
}

.wiv-split-media {
  flex: 1;
  display: flex;
  justify-content: center;
}

/* 视频容器 */
.wiv-video {
  position: relative;
  width: 100%;
  max-width: 800px;
  padding-top: 56.25%;
  border-radius: 0.9rem;
  overflow: hidden;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
  background: #000;
}

.wiv-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* --------------------------------------
   下方内容区域（Numbers + Why VEX）
--------------------------------------- */

.wiv-band {
  width: 100%;
  margin: 0;
  padding: 4rem 0;
  border-radius: 0;
  box-shadow: none;
}

.wiv-band-gray {
  background: #f3f4f6;
}

.wiv-band-light {
  background: #ffffff;
}

.wiv-band h2 {
  font-size: clamp(1.9rem, 1.3vw + 1.2rem, 2.2rem);
  font-weight: 650;
  margin-bottom: 1rem;
}

/* --------------------------------------
   VEX by the Numbers
--------------------------------------- */

.wiv-metrics {
  background: #f3f4f6;
  padding: 5rem 0 4.5rem;
}

.wiv-metrics-title {
  font-size: clamp(2rem, 2.6vw + 1rem, 2.4rem);
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.wiv-metrics-subtitle {
  max-width: 44rem;
  font-size: 1.02rem;
  line-height: 1.6;
  color: #4b5563;
}

.wiv-metrics-grid {
  margin-top: 2.2rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
}

/* 单个卡片 */
.wiv-metric {
  background: #e5e7eb;
  border-radius: 1.4rem;
  padding: 3rem 2.3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* 数字在上 */
.wiv-metric-number {
  font-size: clamp(2rem, 2.4vw + 0.6rem, 2.5rem);
  font-weight: 700;
  color: #111827;
  margin-bottom: 0.6rem;
  line-height: 1.1;
}

/* 文字在下 */
.wiv-metric-label {
  font-size: 0.95rem;
  line-height: 1.35;
  color: #4b5563;
}

.wiv-metric-label strong {
  font-weight: 600;
  color: #111827;
}

/* 删除旧横向布局遗留 */
.wiv-metric-main,
.wiv-metric-text {
  display: none !important;
}

.wiv-metrics-note {
  margin-top: 2.4rem;
  font-size: 0.9rem;
  color: #6b7280;
}

/* 响应式 */
@media (max-width: 900px) {
  .wiv-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .wiv-metrics-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------
   Why VEX Section
--------------------------------------- */

.wiv-why-intro strong {
  font-weight: 600;
  color: #111827;
}

/* 整块 padding 加大 */
.wiv-band.wiv-band-light {
  padding-top: 4rem !important;
  padding-bottom: 0.1rem !important;
}

/* 左右布局 */
.wiv-why-layout {
  display: flex;
  align-items: center;   /* ⭐ bullet 整块与图片中心对齐 */
  gap: 3rem;
  margin-top: 3rem;
}

/* 左列（bullet block） */
.wiv-why-text {
  flex: 1.1;
  display: flex;         /* 让整个 bullet 区垂直居中 */
  align-items: center;
}

/* bullet 列 */
.wiv-why-list {
  margin: 0;
  padding-left: 1.2rem;
  font-size: 1rem;
  color: #374151;
  line-height: 1.8;
}

.wiv-why-list li + li {
  margin-top: 0.5rem;
}

/* 右列（图片） */
.wiv-why-media {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.wiv-why-media img {
  max-width: 100%;
  height: auto;
  border-radius: 1rem;
  object-fit: cover;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18);
}

/* 小屏幕上下堆叠 */
@media (max-width: 900px) {
  .wiv-why-layout {
    flex-direction: column;
    align-items: flex-start;
  }

  .wiv-why-text {
    display: block;
  }

  .wiv-why-media img {
    max-width: 420px;
  }
}

/* Footer 与上方内容保持良好呼吸感 */
footer {
  margin-top: 5rem;                  /* ⭐ 新增：给 footer 本身增加顶部间距 */
}