/* ========= 基础变量 ========= */
:root {
  --max-width: 1100px;
  --gap: 16px;
  --color-primary: #0b3d91;
  --color-dark: #022a55;
  --color-bg: #f6fbff;
  --color-light: #ffffff;
}

/* ========= 全局基础 ========= */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: Inter, system-ui, Arial, sans-serif;
  margin: 0;
  color: #073763;
  background: var(--color-bg);
  line-height: 1.6;
}
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px;
}

/* ========= Header ========= */
.site-header {
  color: var(--color-light);
  padding-bottom: 40px;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
}
.logo img {
  height: clamp(44px, 6vw, 90px); /* 响应式 logo 大小 */
  max-width: 100%;
  object-fit: contain;
}
.main-nav a {
  color: #fff;
  margin: 0 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: clamp(14px, 1.5vw, 16px);
}
.main-nav .btn-contact {
  background: var(--color-light);
  color: var(--color-primary);
  padding: 8px 16px;
  border-radius: 6px;
  font-weight: 700;
}

/* ========= Hero 区域 ========= */
.hero-content {
  padding: 40px 20px;
  text-align: center;
}
.hero-content h1 {
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: clamp(28px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.3;
  margin: 10px 0 16px;
  color: #fff;
}
.hero-content p {
  font-family: "Arial", "Helvetica Neue", sans-serif;
  font-size: clamp(16px, 2.5vw, 22px);
  font-weight: 400;
  color: #eef6ff;
  margin-bottom: 24px;
}
.cta {
  background: #fff;
  color: var(--color-primary);
  padding: clamp(10px, 2vw, 16px) clamp(18px, 3vw, 28px);
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: clamp(14px, 2.2vw, 18px);
  transition: all 0.3s ease;
}
.cta:hover {
  background: #eef6ff;
  color: var(--color-dark);
}

/* ========= Hero 轮播（Slides 居中 + 小屏满宽） ========= */
.carousel {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  justify-content: center;        /* ✅ 居中 slides */
  align-items: center;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 10px;
}
.slide {
  flex: 0 0 auto;
  scroll-snap-align: center;      /* ✅ 滑动时居中 */
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 100%;                /* ✅ 防止超出容器 */
}
.slide img, .slide video {
  width: 100%;                    /* ✅ 默认铺满 slide 宽度 */
  height: auto;
  border-radius: 12px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.15);
}

/* ========= Main 内容 ========= */
main {
  padding: 40px 20px;
}
h2 {
  color: var(--color-primary);
  font-size: clamp(20px, 3vw, 28px);
  margin-bottom: 16px;
  text-align: center;
}
.service-item,
.review {
  background: #fff;
  padding: 16px;
  border-radius: 10px;
  margin: 12px 0;
  box-shadow: 0 6px 18px rgba(11,61,145,0.06);
}
.service-item h3 {
  font-size: clamp(16px, 2.5vw, 22px);
  margin-bottom: 8px;
}
.why-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.why-list li {
  background: #e9f4ff;
  padding: 10px 12px;
  border-radius: 8px;
  flex: 1 1 calc(33% - 12px);
  text-align: center;
}
blockquote.review {
  font-style: italic;
}
blockquote.review footer {
  margin-top: 10px;
  font-weight: 600;
  color: var(--color-dark);
}

/* ========= Footer ========= */
.site-footer {
  background: var(--color-dark);
  color: #fff;
  padding: 20px;
  margin-top: 30px;
  text-align: center;
}

/* ========= 响应式 ========= */
@media (max-width: 1024px) {
  .header-inner {
    flex-direction: column;
    gap: 12px;
  }
  .main-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
  }
  .main-nav a {
    padding: 6px 10px;
  }
}

@media (max-width: 768px) {
  .hero-content {
    padding: 30px 16px;
  }
  .carousel {
    gap: 0;              /* ✅ 小屏不留缝隙 */
  }
  .slide {
    width: 100%;         /* ✅ 小屏每个 slide 占满屏 */
  }
  .slide img, .slide video {
    width: 100%;         /* ✅ 确保图片/视频自适应屏幕 */
    border-radius: 0;    /* ✅ 小屏铺满时去掉圆角更自然 */
  }
  .why-list {
    flex-direction: column;
  }
  .why-list li {
    flex: 1 1 100%;
  }
  .service-item,
  .review {
    margin: 12px auto;
  }
}