/* ===================================================
   ESCALATOR SUMMARY STYLESHEET (escalator.css)
   =================================================== */

/* Reset & Basics */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  min-height: 100%;
  overflow-x: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background-color: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* 1. 100vh Hero Banner */
.hero-banner {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background-color: #f0f0f0;
}

.banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 主容器 */
.escalator-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 80px 30px 100px 30px;
}

/* 通用顶部渐变分割线：整条浅灰线，左端加粗渐变条 */
.top-gradient-bar {
  position: relative;
  width: 100%;
  height: 1px;
  background-color: #eaedf1;
  margin-bottom: 28px;
}

.top-gradient-bar::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1.5px;
  width: 110px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, #c81e3a 0%, #5b1a7d 50%, #1b2685 100%);
}

/* ===================================================
   SECTION 1: OVERVIEW (SE930)
   =================================================== */
.section-overview {
  margin-bottom: 100px;
}

.section-top {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 80px;
  min-height: 460px;
}

/* 左容器：上下两端分布 */
.top-left {
  flex: 0 0 42%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 4px;
}

.product-title {
  font-size: 2.6rem;
  font-weight: 300;
  color: #2b2b2b;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

/* SE930 渐变大字 */
.gradient-model {
  font-size: 6.8rem;
  font-weight: 200;
  line-height: 0.95;
  letter-spacing: -1px;
  background: linear-gradient(90deg, #c81e3a 0%, #701c6e 45%, #1c2b85 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 右容器 */
.top-right {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.product-desc {
  font-size: 0.88rem;
  color: #555555;
  line-height: 1.68;
  text-align: justify;
  margin-bottom: 24px;
}

/* 特性图标列表 */
.feature-list {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 0;
  border-top: 1px solid #eaedf1;
}

.feature-item:last-child {
  border-bottom: 1px solid #eaedf1;
}

.feature-icon {
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.static-icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.feature-text {
  font-size: 0.88rem;
  color: #3f3f3f;
}

/* ===================================================
   SECTION 2: TECHNOLOGY & 4 ARRANGEMENT TYPES
   =================================================== */
.section-technology {
  margin-bottom: 110px;
}

.tech-title {
  font-size: 2.3rem;
  font-weight: 300;
  color: #2b2b2b;
  text-align: center;
  line-height: 1.3;
  margin-bottom: 30px;
  letter-spacing: -0.5px;
}

.tech-img-wrap {
  width: 100%;
  max-width: 960px;
  margin: 0 auto 50px auto;
  display: flex;
  justify-content: center;
}

.tech-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

/* 4 个排列方式卡片网格 (2x2) */
.arrangements-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  width: 100%;
}

.arr-card {
  display: flex;
  align-items: center;
  border-radius: 10px;
  padding: 18px 24px;
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
}

/* 四种渐变背景 */
.card-red {
  background: linear-gradient(90deg, #c81e3a 0%, #880922 100%);
}

.card-blue-purple {
  background: linear-gradient(90deg, #371c84 0%, #171869 100%);
}

.card-magenta {
  background: linear-gradient(90deg, #cb193e 0%, #75124b 100%);
}

.card-purple-blue {
  background: linear-gradient(90deg, #4f187a 0%, #1b2685 100%);
}

/* 左侧数字 */
.arr-num {
  font-size: 3.2rem;
  font-weight: 200;
  line-height: 1;
  margin-right: 20px;
  opacity: 0.95;
  letter-spacing: -0.5px;
}

/* 右侧文字 */
.arr-text {
  font-size: 0.95rem;
  font-weight: 300;
  letter-spacing: 0.2px;
}

/* ===================================================
   SECTION 3 & SECTION 4: CONSTRUCTION PARAMETERS
   =================================================== */
.section-parameters {
  margin-bottom: 90px;
  width: 100%;
}

.param-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 50px;
}

/* 左容器 */
.param-left-col {
  flex: 0 0 44%;
  display: flex;
  flex-direction: column;
}

.param-heading {
  font-size: 2.1rem;
  font-weight: 300;
  color: #2b2b2b;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 30px;
}

.param-photo-wrap {
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 30px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

.param-photo {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.param-table-wrap {
  width: 100%;
}

.param-table-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

/* 右容器 */
.param-right-col {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.param-cad-wrap {
  width: 100%;
}

.cad-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

/* ===================================================
   RESPONSIVE DESIGN (响应式适配)
   =================================================== */
@media (max-width: 1024px) {
  .section-top {
    flex-direction: column;
    min-height: auto;
    gap: 40px;
  }

  .top-left {
    flex: auto;
    width: 100%;
    gap: 20px;
  }

  .arrangements-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .param-grid {
    flex-direction: column;
    gap: 40px;
  }

  .param-left-col {
    flex: auto;
    width: 100%;
  }
}

@media (max-width: 768px) {
  .hero-banner {
    height: 70vh;
  }

  .escalator-container {
    padding: 40px 16px 60px 16px;
  }

  .product-title, .tech-title, .param-heading {
    font-size: 1.8rem;
  }

  .gradient-model {
    font-size: 4rem;
  }

  .arr-num {
    font-size: 2.4rem;
    margin-right: 14px;
  }

  .arr-text {
    font-size: 0.85rem;
  }
}