/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Microsoft Yahei', 'Helvetica Neue', Arial, sans-serif;
  color: #374151;
  background-color: #ffffff;
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
}

/* 容器 */
.container {
  width: 100%;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (min-width: 640px) {
  .container {
    padding: 0 2rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 2rem;
    max-width: 1200px;
  }
}

/* 头部banner */
header {
  position: relative;
  height: 420px;
  overflow: hidden;
  background: linear-gradient(135deg, #001A33 0%, #003366 100%);
}

header .bg-img {
  position: absolute;
  inset: 0;
  opacity: 0.25;
}

header .bg-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

header .content {
  position: relative;
  z-index: 10;
  height: 100%;
  display: flex;
  align-items: center;
}

header .text-wrap {
  max-width: 600px;
}

header h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 1rem;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

header p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: #0066CC;
  color: #fff;
  font-weight: 500;
  border-radius: 6px;
  transition: 0.3s;
}

.contact-btn:hover {
  background: #005bb3;
}

/* 面包屑 */
.breadcrumb {
  background: #fff;
  border-bottom: 1px solid #eee;
  padding: 12px 0;
}

.breadcrumb .text-wrap {
  font-size: 14px;
  color: #666;
}

.breadcrumb a {
  color: #666;
}

.breadcrumb a:hover {
  color: #0066CC;
}

.breadcrumb span {
  margin: 0 6px;
}

.breadcrumb .active {
  color: #003366;
  font-weight: 500;
}

/* 公司介绍 */
.intro-section {
  padding: 50px 0;
}

.intro-section h2 {
  font-size: 26px;
  text-align: center;
  color: #003366;
  margin-bottom: 30px;
  position: relative;
}

.intro-section h2::after {
  content: '';
  width: 60px;
  height: 3px;
  background: #0066CC;
  display: block;
  margin: 10px auto 0;
  border-radius: 3px;
}

.intro-section .text-content {
  max-width: 900px;
  margin: 0 auto;
  color: #444;
  font-size: 15px;
  line-height: 1.8;
}

.intro-section p {
  margin-bottom: 16px;
}

/* ------------------------- */
/* 艺术字（高级科技渐变效果） */
/* ------------------------- */
.art-text {
  max-width: 900px;
  margin: 50px auto 0;
  text-align: center;
  padding: 25px 20px;
  border-top: 1px dashed #cce4ff;
  border-bottom: 1px dashed #cce4ff;
}

.art-text p {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 2px;
  background: linear-gradient(90deg, #0066CC, #00a3ff, #003366);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: textShine 3s linear infinite;
  margin-bottom: 10px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.art-text p:last-child {
  font-size: 24px;
  background: linear-gradient(90deg, #003366, #0066CC, #00a3ff);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: textShine 3.5s linear infinite reverse;
}

@keyframes textShine {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}

/* 横幅图 */
.env-img-section {
  padding: 20px 0;
}

.env-img-wrap {
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
}

.env-img-wrap img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

/* 联系我们 */
.contact-section {
  padding: 60px 0;
  background: #001A33;
  color: #fff;
}

.contact-section h2 {
  font-size: 26px;
  text-align: center;
  margin-bottom: 40px;
}

.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 30px;
  max-width: 900px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .contact-info-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.contact-info-item {
  text-align: center;
}

.contact-info-item i {
  font-size: 32px;
  color: #0066CC;
  margin-bottom: 12px;
}

.contact-info-item h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.contact-info-item p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
}

/* 页脚 */
footer {
  background: #111827;
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: 25px 0;
  font-size: 13px;
}

/* 返回顶部 */
#backToTop {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: #0066CC;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  transition: 0.3s;
  opacity: 0;
  visibility: hidden;
}

#backToTop.visible {
  opacity: 1;
  visibility: visible;
}