/**
 * 落地页样式文件
 * 中净国际 - 净化工程服务落地页
 * 科技蓝主题色 #0066cc
 */

/* ========== 全局样式 ========== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
  color: #333333;
  line-height: 1.6;
  background-color: #ffffff;
}

a {
  color: #0066cc;
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: #0052a3;
}

/* ========== 顶部导航 ========== */
.top-header {
  background: #0052a3;
  color: white;
  padding: 8px 0;
  font-size: 0.9rem;
}

.top-header span {
  margin-right: 10px;
}

.top-header i {
  margin-right: 5px;
}

.lang-switch {
  cursor: pointer;
  padding: 2px 10px;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 3px;
  margin-left: 10px;
  transition: all 0.3s ease;
}

.lang-switch:hover {
  background: rgba(255,255,255,0.1);
}

.lang-switch input {
  border: none;           /* 清除边框 */
  padding: 0;             /* 清除内边距 */
  margin: 0;              /* 清除外边距（如有） */
  background: transparent; /* 清除背景色 */
  outline: none;          /* 清除焦点时的蓝色/黑色边框 */
  -webkit-appearance: none; /* 移除 iOS 和 Safari 的默认样式 */
  -moz-appearance: none;    /* 移除 Firefox 的默认样式 */
  appearance: none;         /* 标准语法 */
  font-family: inherit;     /* 继承父元素字体 */
  font-size: inherit;       /* 继承字体大小 */
  color: inherit;           /* 继承文字颜色 */
}

.top-header .lang-switch:hover {
  background: rgba(255,255,255,0.2);
}

.top-header .lang-switch.active {
  background: rgba(255,255,255,0.3);
  font-weight: 500;
}

.main-header {
  background: white;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.main-header .navbar {
  padding: 15px 0;
}

.main-header .navbar-brand img {
  height: 50px;
}

.main-header .navbar-toggler {
  border: none;
  padding: 8px;
  color: #0066cc;
  font-size: 1.3rem;
}

.nav-link {
  color: #333333 !important;
  font-weight: 500;
  padding: 10px 20px !important;
  position: relative;
  transition: all 0.3s ease;
}

.main-header .nav-link:hover,
.main-header .nav-link.active {
  color: #0066cc;
}

/* ========== Banner轮播 ========== */
.banner-section {
  position: relative;
}

.banner-section .carousel-item {
  height: 500px;
  background-size: cover;
  background-position: center;
  position: relative;
}

.banner-item {
  height: 100%;
  position: relative;
}

.banner-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0,102,204,0.8), rgba(0,168,255,0.6));
}

.banner-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: white;
  z-index: 1;
  width: 90%;
  max-width: 700px;
}

.banner-content h2 {
  font-size: 3rem;
  margin-bottom: 20px;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.banner-content p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  opacity: 0.95;
}

.banner-btn {
  background: white;
  color: #0066cc;
  padding: 15px 40px;
  border-radius: 5px;
  font-size: 1.1rem;
  font-weight: 600;
  display: inline-block;
  transition: all 0.3s ease;
}

.banner-btn:hover {
  background: #f8f9fa;
  transform: translateY(-3px);
  box-shadow: 0 5px 20px rgba(0,0,0,0.2);
  color: #0066cc;
}

.carousel-indicators button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  margin: 0 5px;
  border: none;
  opacity: 1;
}

.carousel-indicators button.active {
  background: white;
}

/* ========== 通用按钮 ========== */
.btn-primary {
  background: linear-gradient(135deg, #0066cc, #3388dd);
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 5px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0052a3, #0066cc);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 102, 204, 0.2);
  color: white;
}

.btn-outline {
  background: transparent;
  color: #0066cc;
  border: 2px solid #0066cc;
  padding: 10px 28px;
  border-radius: 5px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-outline:hover {
  background: #0066cc;
  color: white;
}

/* ========== 区块标题 ========== */
.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2rem;
  color: #333333;
  margin-bottom: 15px;
  font-weight: 600;
}

.section-title p {
  color: #666666;
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, #0066cc, #00a8ff);
  margin: 20px auto 0;
  border-radius: 2px;
}

/* ========== 关于我们 ========== */
.about-section {
  padding: 80px 0;
  background: #f8f9fa;
}

.about-content h2 {
  font-size: 1.8rem;
  color: #0066cc;
  margin-bottom: 15px;
}

.about-content .subtitle {
  color: #666666;
  font-size: 1.05rem;
  margin-bottom: 20px;
}

.about-content .description {
  color: #555555;
  margin-bottom: 25px;
  text-align: justify;
  line-height: 1.8;
}

.about-content .highlights {
  padding-left: 0;
  list-style: none;
}

.about-content .highlights li {
  padding: 8px 0;
  color: #333333;
  font-size: 0.95rem;
  position: relative;
  padding-left: 30px;
}

.about-content .highlights li::before {
  content: '\f00c';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  left: 0;
  color: #0066cc;
  width: 20px;
  height: 20px;
  background: rgba(0, 102, 204, 0.1);
  border-radius: 50%;
  text-align: center;
  line-height: 20px;
  font-size: 0.65rem;
}

.about-img {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.1);
}

.about-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all 0.3s ease;
}

.about-img:hover img {
  transform: scale(1.05);
}

/* ========== 数据统计 ========== */
.stats-section {
  padding: 60px 0;
  background: linear-gradient(135deg, #0066cc, #0052a3);
  color: white;
}

.stat-item {
  text-align: center;
  padding: 20px;
}

.stat-item .icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
  opacity: 0.9;
}

.stat-item .number {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 5px;
}

.stat-item .number .suffix {
  font-size: 1.5rem;
  font-weight: 500;
}

.stat-item .label {
  font-size: 0.95rem;
  opacity: 0.85;
}

/* ========== 服务项目 ========== */
.services-section {
  padding: 80px 0;
}

.services-section .row > [class*="col-"] {
  margin-bottom: 30px;
}

.service-card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.1);
  transition: all 0.3s ease;
  height: 100%;
  text-align: center;
  padding: 40px 30px;
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 8px 25px rgba(0, 102, 204, 0.2);
}

.service-card .icon-box {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #0066cc, #00a8ff);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 25px;
}

.service-card .icon-box i {
  font-size: 2.5rem;
  color: white;
}

.service-card h3 {
  font-size: 1.3rem;
  color: #333333;
  margin-bottom: 15px;
}

.service-card p {
  color: #666666;
  font-size: 0.95rem;
}

/* ========== 服务优势 ========== */
.advantages-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #0066cc, #0052a3);
  color: white;
}

.advantages-section .section-title h2,
.advantages-section .section-title p {
  color: white;
}

.advantages-section .section-title::after {
  background: white;
}

.advantage-item {
  text-align: center;
  padding: 30px 20px;
}

.advantage-item .icon {
  width: 80px;
  height: 80px;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 2rem;
  transition: all 0.3s ease;
}

.advantage-item:hover .icon {
  background: white;
  color: #0066cc;
  transform: scale(1.1);
}

.advantage-item h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.advantage-item p {
  opacity: 0.9;
  font-size: 0.95rem;
}

/* ========== 服务流程 ========== */
.process-section {
  padding: 80px 0;
  background: #f8f9fa;
}

.process-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
}

.process-step {
  display: flex;
  align-items: center;
  gap: 16px;
  background: #ffffff;
  border-radius: 12px;
  padding: 20px 24px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
  flex: 1;
  min-width: 140px;
  max-width: 200px;
}

.process-step:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 102, 204, 0.15);
  border-color: #0066cc;
}

.step-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: #0066cc;
  color: #ffffff;
  border-radius: 50%;
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.process-step:hover .step-num {
  background: #ff6b35;
}

.step-body h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #333333;
  margin-bottom: 4px;
}

.step-body p {
  font-size: 0.8rem;
  color: #666666;
  margin: 0;
  line-height: 1.5;
}

.step-arrow {
  flex-shrink: 0;
  color: #0066cc;
  font-size: 1rem;
  padding: 0 8px;
  opacity: 0.5;
}

@media (max-width: 991px) {
  .process-flow {
    flex-direction: column;
    gap: 12px;
  }

  .process-step {
    max-width: 100%;
    width: 100%;
  }

  .step-arrow {
    transform: rotate(90deg);
    padding: 0;
  }
}

/* ========== 客户案例 ========== */
.cases-section {
  padding: 80px 0;
}

.cases-section .row > [class*="col-"] {
  margin-bottom: 30px;
}

.case-card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.1);
  transition: all 0.3s ease;
  height: 100%;
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 102, 204, 0.2);
}

.case-card .img-box {
  height: 200px;
  overflow: hidden;
}

.case-card .img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all 0.3s ease;
}

.case-card:hover .img-box img {
  transform: scale(1.1);
}

.case-card .content-box {
  padding: 20px;
}

.case-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  color: #333333;
}

.case-card .case-desc {
  color: #666666;
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.case-card .tag {
  display: inline-block;
  background: #f8f9fa;
  color: #0066cc;
  padding: 3px 10px;
  border-radius: 3px;
  font-size: 0.8rem;
  margin-right: 5px;
}

/* ========== 客户评价 ========== */
.testimonials-section {
  padding: 80px 0;
  background: #f8f9fa;
}

.testimonial-card {
  background: white;
  border-radius: 10px;
  padding: 30px;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.1);
  transition: all 0.3s ease;
  height: 100%;
  position: relative;
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 102, 204, 0.2);
}

.testimonial-card .quote-icon {
  color: #0066cc;
  font-size: 2rem;
  opacity: 0.2;
  position: absolute;
  top: 15px;
  right: 20px;
}

.testimonial-card .stars {
  color: #ffc107;
  margin-bottom: 15px;
}

.testimonial-card .content {
  color: #555555;
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-card .author {
  display: flex;
  align-items: center;
}

.testimonial-card .author .avatar {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #0066cc, #00a8ff);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  font-weight: 600;
  margin-right: 15px;
  flex-shrink: 0;
}

.testimonial-card .author .info h4 {
  font-size: 1rem;
  color: #333333;
  margin-bottom: 3px;
}

.testimonial-card .author .info p {
  color: #999999;
  font-size: 0.85rem;
  margin-bottom: 0;
}

/* ========== 资讯动态 ========== */
.news-section {
  padding: 80px 0;
}

.news-section .row > [class*="col-"] {
  margin-bottom: 30px;
}

.news-card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.1);
  transition: all 0.3s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 102, 204, 0.2);
}

.news-card .img-box {
  height: 200px;
  overflow: hidden;
  position: relative;
}

.news-card .img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: all 0.3s ease;
}

.news-card:hover .img-box img {
  transform: scale(1.08);
}

.news-card .news-category {
  position: absolute;
  top: 12px;
  left: 12px;
  background: linear-gradient(135deg, #0066cc, #00a8ff);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

.news-card .content-box {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.news-card .news-meta {
  margin-bottom: 10px;
}

.news-card .news-meta .date {
  color: #999999;
  font-size: 0.85rem;
}

.news-card .news-meta .date i {
  margin-right: 5px;
  color: #0066cc;
}

.news-card h3 {
  font-size: 1.1rem;
  color: #333333;
  margin-bottom: 10px;
  line-height: 1.5;
  transition: color 0.3s ease;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card:hover h3 {
  color: #0066cc;
}

.news-card p {
  color: #666666;
  font-size: 0.9rem;
  line-height: 1.7;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card .read-more {
  color: #0066cc;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 12px;
  transition: all 0.3s ease;
}

.news-card .read-more:hover {
  gap: 10px;
  color: #0052a3;
}

.news-card .read-more i {
  font-size: 0.8rem;
  transition: transform 0.3s ease;
}

.news-card:hover .read-more i {
  transform: translateX(3px);
}

/* ========== 常见问题 ========== */
.faq-section {
  padding: 80px 0;
  background: #f8f9fa;
}

.faq-wrapper {
  position: relative;
}

.faq-item {
  background: white;
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.05);
  transition: all 0.3s ease;
  border: 1px solid #f0f0f0;
}

.faq-item:hover {
  box-shadow: 0 4px 15px rgba(0, 102, 204, 0.1);
  border-color: #e0e8f5;
}

.faq-item.active {
  border-color: #0066cc;
  box-shadow: 0 4px 20px rgba(0, 102, 204, 0.12);
}

.faq-question {
  padding: 18px 25px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
  user-select: none;
}

.faq-q-left {
  display: flex;
  align-items: center;
  gap: 15px;
  flex: 1;
  min-width: 0;
}

.faq-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, #e8f4fd, #d1e9fa);
  color: #0066cc;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.faq-item.active .faq-icon {
  background: linear-gradient(135deg, #0066cc, #00a8ff);
  color: white;
}

.faq-q-text {
  font-weight: 500;
  color: #333333;
  font-size: 1rem;
  line-height: 1.5;
  transition: color 0.3s ease;
}

.faq-item.active .faq-q-text {
  color: #0066cc;
}

.faq-q-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  margin-left: 15px;
}

.faq-tag {
  background: #f0f5ff;
  color: #0066cc;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.faq-arrow {
  color: #0066cc;
  transition: transform 0.3s ease;
  font-size: 0.85rem;
  width: 28px;
  height: 28px;
  background: #f0f5ff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.faq-item.active .faq-arrow {
  transform: rotate(180deg);
  background: #0066cc;
  color: white;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer-inner {
  padding: 0 25px 20px 82px;
  color: #666666;
  line-height: 1.8;
  font-size: 0.95rem;
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-cta {
  text-align: center;
  margin-top: 40px;
  padding: 30px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.05);
}

.faq-cta p {
  color: #666666;
  margin-bottom: 15px;
  font-size: 1rem;
}

.faq-cta .btn-primary {
  display: inline-flex;
  align-items: center;
}

/* ========== 联系表单 ========== */
.contact-section {
  padding: 80px 0;
}

.contact-form {
  background: white;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 102, 204, 0.1);
}

.contact-form h3 {
  font-size: 1.5rem;
  color: #0066cc;
  margin-bottom: 10px;
}

.contact-form .subtitle {
  color: #666666;
  margin-bottom: 30px;
}

.form-group {
  margin-bottom: 20px;
}

.form-label {
  font-weight: 500;
  margin-bottom: 8px;
  color: #333333;
}

.form-label .required {
  color: #dc3545;
}

.form-control {
  border: 1px solid #e0e0e0;
  border-radius: 5px;
  padding: 12px 15px;
  transition: all 0.3s ease;
}

.form-control:focus {
  border-color: #0066cc;
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-control.is-invalid {
  border-color: #dc3545;
}

.form-control.is-valid {
  border-color: #28a745;
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* ========== 联系信息 ========== */
.contact-info {
  padding: 40px;
  background: #f8f9fa;
  border-radius: 10px;
  height: 100%;
}

.contact-info h3 {
  font-size: 1.5rem;
  color: #0066cc;
  margin-bottom: 30px;
}

.contact-item {
  display: flex;
  margin-bottom: 25px;
  align-items: flex-start;
}

.contact-item i {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #0066cc, #00a8ff);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 15px;
  flex-shrink: 0;
}

.contact-item .text h4 {
  font-size: 1rem;
  color: #333333;
  margin-bottom: 5px;
}

.contact-item .text p {
  color: #666666;
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* ========== 浮动咨询栏 ========== */
.floating-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
  padding: 12px 0;
  z-index: 998;
  display: none;
}

.floating-bar.show {
  display: block;
}

.floating-bar .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

.floating-bar .btn-call {
  background: linear-gradient(135deg, #0066cc, #3388dd);
  color: white;
  border: none;
  padding: 10px 25px;
  border-radius: 5px;
  font-size: 1rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
}

.floating-bar .btn-call:hover {
  background: linear-gradient(135deg, #0052a3, #0066cc);
  transform: translateY(-2px);
  color: white;
}

.floating-bar .btn-form {
  background: linear-gradient(135deg, #ff6b35, #ff8c42);
  color: white;
  border: none;
  padding: 10px 25px;
  border-radius: 5px;
  font-size: 1rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
}

.floating-bar .btn-form:hover {
  background: linear-gradient(135deg, #e55a2b, #ff6b35);
  transform: translateY(-2px);
  color: white;
}

/* ========== 页脚 ========== */
.footer {
  background: #333333;
  color: white;
  padding: 60px 0 30px;
}

.footer h4 {
  font-size: 1.2rem;
  margin-bottom: 25px;
  position: relative;
  padding-bottom: 10px;
}

.footer h4::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 2px;
  background: #0066cc;
}

.footer ul {
  padding-left: 0;
  margin-bottom: 0;
}

.footer ul li {
  margin-bottom: 12px;
  list-style: none;
}

.footer ul li a {
  color: rgba(255,255,255,0.7);
  transition: all 0.3s ease;
}

.footer ul li a:hover {
  color: white;
  padding-left: 5px;
}

.footer p {
  color: rgba(255,255,255,0.7);
  margin-bottom: 10px;
}

.footer-logo {
  margin-top: 20px;
  padding: 10px;
  background-color: white;
  display: inline-block;
}

.footer-logo img {
  height: 45px;
  width: auto;
  transition: all 0.3s ease;
}

.footer-logo img:hover {
  transform: scale(1.05);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 30px;
  margin-top: 40px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.9rem;
}

.footer-keywords,
.footer-links {
  line-height: 2;
}

.footer-link {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  margin-right: 5px;
  font-size: 0.85rem;
  transition: all 0.3s ease;
}

.footer-link:hover {
  color: white;
}

.footer-link::after {
  content: '|';
  margin-left: 15px;
  color: rgba(255,255,255,0.3);
}

.footer-link:last-child::after {
  display: none;
}

/* ========== 返回顶部 ========== */
.back-to-top {
  position: fixed;
  bottom: 80px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: #0066cc;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 999;
  border: none;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: #0052a3;
  transform: translateY(-5px);
}

/* ========== 提示框 ========== */
.alert {
  padding: 15px 20px;
  border-radius: 5px;
  margin-bottom: 20px;
}

.alert-success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-danger {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* ========== 加载动画 ========== */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========== 动画效果 ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

/* ========== 响应式设计 ========== */
@media (max-width: 991px) {
  .banner-content h2 {
    font-size: 2.5rem;
  }
  
  .section-title h2 {
    font-size: 1.6rem;
  }
  
  .contact-form,
  .contact-info {
    margin-bottom: 30px;
  }

  .about-content {
    margin-bottom: 30px;
  }


  .stat-item .number {
    font-size: 2rem;
  }
}

@media (max-width: 767px) {
  .top-header {
    display: none;
  }
  
  .main-header .navbar-brand img {
    height: 40px;
  }
  
  .banner-item {
    height: 400px;
  }
  
  .banner-content h2 {
    font-size: 1.8rem;
  }
  
  .banner-content p {
    font-size: 1rem;
  }
  
  .banner-btn {
    padding: 12px 30px;
    font-size: 1rem;
  }
  
  .section-title h2 {
    font-size: 1.4rem;
  }
  
  .service-card {
    padding: 30px 20px;
  }
  
  .contact-form {
    padding: 25px;
  }
  
  .footer {
    padding: 40px 0 20px;
  }
  
  .footer h4 {
    font-size: 1.1rem;
    margin-bottom: 15px;
  }
  
  .footer-bottom {
    margin-top: 20px;
    padding-top: 20px;
  }

  .about-content h2 {
    font-size: 1.5rem;
  }

  .stat-item .number {
    font-size: 1.8rem;
  }

  .floating-bar .btn-call,
  .floating-bar .btn-form {
    padding: 8px 18px;
    font-size: 0.9rem;
  }

  .back-to-top {
    bottom: 90px;
    width: 44px;
    height: 44px;
    right: 15px;
  }
}