/* ===================================================
   SMART SERVICE STYLESHEET (smart.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: #1a1a1a;
}

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

/* 主容器 */
.smart-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 90px 30px 120px 30px;
}

/* 头部主标题与居中分割线 */
.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 300;
  color: #2b2b2b;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.center-gradient-divider {
  position: relative;
  width: 100%;
  height: 1px;
  background-color: #eaedf1;
  margin: 0 auto;
}

.center-gradient-divider::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -1.5px;
  transform: translateX(-50%);
  width: 120px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, #c81e3a 0%, #5b1a7d 50%, #1b2685 100%);
}

/* ===================================================
   SECTION 1: IOT HERO CARD
   =================================================== */
.iot-hero-section {
  width: 100%;
  margin-bottom: 60px;
}

.iot-hero-card {
  width: 100%;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
  background-color: #0c1224;
}

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

/* ===================================================
   SECTION 2: FEATURES LIST & GRADIENT NUMBERS
   =================================================== */
.smart-features-section {
  width: 100%;
}

.features-list {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.feature-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 0;
  border-bottom: 1px solid #eaedf1;
}

.feature-item:first-child {
  border-top: 1px solid #eaedf1;
}

/* 左侧超大轻细数字 */
.feature-num {
  font-size: 3.8rem;
  font-weight: 200;
  line-height: 1;
  letter-spacing: -1px;
}

/* 从上到下依次过渡的渐变色阶 (红 -> 玫红 -> 紫 -> 蓝紫 -> 蓝) */
.num-01 {
  color: #c81e3a;
}

.num-02 {
  color: #a4195a;
}

.num-03 {
  color: #721a78;
}

.num-04 {
  color: #3f1e85;
}

.num-05 {
  color: #1b2685;
}

/* 右侧文字内容（右对齐） */
.feature-text-block {
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 400;
  color: #222222;
  margin-bottom: 6px;
  letter-spacing: -0.2px;
}

.feature-desc {
  font-size: 0.85rem;
  font-weight: 300;
  color: #666666;
  letter-spacing: 0.2px;
}

/* ===================================================
   RESPONSIVE DESIGN (响应式适配)
   =================================================== */
@media (max-width: 1024px) {
  .feature-num {
    font-size: 3.2rem;
  }

  .feature-title {
    font-size: 1.2rem;
  }
}

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

  .smart-container {
    padding: 50px 16px 80px 16px;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .feature-item {
    padding: 24px 0;
  }

  .feature-num {
    font-size: 2.6rem;
  }

  .feature-title {
    font-size: 1.05rem;
  }

  .feature-desc {
    font-size: 0.78rem;
  }
}