/* 全局基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* 通用容器：中间80%，左右10%间距 */
.section-container, .nav-container {
  width: 80% !important;
  max-width: 1600px;
  margin: 0 auto;
}

/* ==================== Header 导航样式 ==================== */
#mainNav {
  background: transparent;
  padding: 15px 0;
  transition: all 0.3s ease;
  z-index: 999;
}
/* 滚动后导航样式 */
#mainNav.scrolled {
  background: #ffffff !important;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
/* Logo */
.navbar-brand img {
  height: 40px;
}
.logo-color {
  display: none;
}
#mainNav.scrolled .logo-white {
  display: none;
}
#mainNav.scrolled .logo-color {
  display: block;
}
/* 导航链接 */
.nav-link {
  color: #ffffff !important;
  font-weight: 500;
  margin: 0 10px;
  position: relative;
}
#mainNav.scrolled .nav-link {
  color: #000000 !important;
}
/* 导航下划线高亮 */
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background: #fff;
}
#mainNav.scrolled .nav-link.active::after {
  background: #000;
}
/* 图标样式 */
.nav-link i {
  margin-right: 5px;
}
#mainNav.scrolled .nav-link i {
  color: #000;
}
/* Contact按钮 */
.contact-btn {
  border: 2px solid #fff;
  border-radius: 5px;
  padding: 6px 15px !important;
}
#mainNav.scrolled .contact-btn {
  border-color: #000;
  color: #000 !important;
}

/* ==================== Banner 轮播 ==================== */
.banner-swiper {
  height: 90vh;
}
.banner-swiper img {
  height: 90vh;
  object-fit: cover;
}
.swiper-pagination-bullet {
  background: #fff !important;
}

/* ==================== Unrivaled 部分 ==================== */
.unrivaled {
  background: #f7f7f7;
  padding: 80px 0;
}
/* Tab按钮 */
.btn-tab {
  background: #000;
  color: #fff;
  border-radius: 0;
  margin-left: 10px;
}
.btn-tab.active {
  background: #555;
}
.tab-content .tab-pane {
  display: none;
}
.tab-content .tab-pane.active {
  display: block;
}
/* 通栏图片 */
.full-width-img img {
  height: 400px;
  object-fit: cover;
}

/* ==================== Expert 部分 ==================== */
.expert {
  padding: 80px 0;
}

/* ==================== Schedule 部分 ==================== */
.schedule {
  background: #f5f5f5;
  padding: 80px 0;
}
.form-wrapper {
  width: 60%;
}
.submit-btn {
  background: #000;
  color: #fff;
  border-radius: 5px;
  padding: 10px;
  font-weight: 500;
}
.submit-btn:hover {
  background: #333;
  color: #fff;
}

/* ==================== Footer 部分 ==================== */
.footer {
  background: #000;
  padding: 40px 0 20px;
}
.footer-logo {
  height: 40px;
}
.vertical-line {
  width: 1px;
  height: 30px;
  background: #666;
}
.footer-bottom {
  color: #fff;
}

/* ==================== 响应式适配 ==================== */
@media (max-width: 992px) {
  .section-container, .nav-container {
    width: 90% !important;
  }
  .form-wrapper {
    width: 100%;
  }
  .footer-top, .footer-bottom {
    text-align: center;
  }
}

/* Unrivaled 轮播分页样式 */
.unrivaled-swiper .swiper-pagination {
  bottom: 10px;
}
.unrivaled-swiper .swiper-pagination-bullet {
  background: #000;
  opacity: 0.5;
}
.unrivaled-swiper .swiper-pagination-bullet-active {
  background: #000;
  opacity: 1;
}