* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Roboto, sans-serif;
}
:root {
  --primary: #1a1a1a;
  --accent: #c8a976;
  --light: #f7f7f7;
  --white: #fff;
  --dark: #222;
}
body {
  color: #333;
  line-height: 1.7;
  font-size: 16px;
}
a {
  text-decoration: none;
  color: inherit;
}
.container {
  width: 92%;
  max-width: 1280px;
  margin: 0 auto;
}

/* Nav */
nav {
  background: white;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 999;
}
.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0;
}
.logo {
  font-size: 22px;
  font-weight: 600;
  color: var(--primary);
}
.logo span {
  color: var(--accent);
}
.menu {
  display: flex;
  gap: 32px;
}
.menu-item {
  position: relative;
  font-weight: 500;
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
.menu-item > a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 0;
  transition: color 0.3s ease;
}
.menu-item > a:hover {
  color: var(--accent) !important;
}
.arrow-icon {
  font-size: 11px;
  transition: 0.3s;
}
.menu-item:hover .arrow-icon {
  transform: rotate(180deg);
}
.menu-item a.active {
  color: var(--accent);
}
.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: white;
  min-width: 220px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  border-radius: 6px;
  z-index: 1000;
}
.submenu-item {
  padding: 12px 18px;
  font-size: 15px;
}
.submenu-item:hover {
  background: var(--light);
  color: var(--accent);
}
.menu-item:hover .submenu {
  display: block;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  padding: 8px;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: #222;
}

/* 面包屑当前位�?*/
.breadcrumb {
    background: #f5f5f5;
    padding: 15px 0;
    font-size: 15px;
}
.breadcrumb a {
    color: #666;
}
.breadcrumb a:hover {
    color: var(--accent);
}
.breadcrumb span {
    margin: 0 8px;
    color: #999;
}
.breadcrumb .current {
    color: var(--accent);
}

/* Banner 小图 */
.page-banner {
  height: 320px;
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
}
.banner-overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.4);
}
.page-banner h1 {
  position: relative;
  z-index: 2;
  font-size: 38px;
}

/* Carousel */
.carousel {
  height: 600px;
  position: relative;
  overflow: hidden;
}
.slide {
  position: absolute;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1s ease;
  display: flex;
  align-items: center;
}
.slide.active {
  opacity: 1;
}
.overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.35);
}
.carousel-content {
  position: relative;
  z-index: 2;
  color: white;
  max-width: 1280px;
  width: 92%;
  margin: 0 auto;
}
.carousel-content h1 {
  font-size: 46px;
  margin-bottom: 14px;
}
.carousel-content p {
  font-size: 19px;
  margin-bottom: 28px;
  max-width: 600px;
}
.btn {
  padding: 15px 32px;
  display: inline-block;
  border-radius: 4px;
  font-weight: 500;
  font-size: 16px;
  transition: 0.3s;
  border: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: white;
}
.btn-outline {
  border: 1px solid white;
  color: white;
  background: transparent;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255,255,255,0.25);
  border: none;
  color: #fff;
  font-size: 20px;
  z-index: 3;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.prev-btn { left: 30px; }
.next-btn { right: 30px; }
.carousel-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 3;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
}
.dot.active {
  background: var(--accent);
}

/* Section */
.section {
  padding: 70px 0;
}
.section-title {
  text-align: center;
  margin-bottom: 40px;
}
.section-title h2 {
  font-size: 32px;
  margin-bottom: 12px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 30px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 40px;
  align-items: center;
}
.card {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.3s ease;
}
.card:hover {
  transform: translateY(-5px);
}
.card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}
.card .info h3 {
  font-size: 17px;
}
.card .info {
  padding: 22px;
}
.why-list li {
  list-style: none;
  margin-bottom: 14px;
  padding-left: 26px;
  position: relative;
  font-size: 16px; background:url(../images/gx.jpg) no-repeat;
}


.additional {
  background: #f9f9f9;
  padding: 60px 0;
}
.additional-img img {
  width: 100%;
  border-radius: 8px;
}
.additional-text h2{
  font-size: 30px;
}
.additional-text {
  padding-right: 20px;
}
.additional-text p {
  margin: 18px 0 28px;
  line-height: 1.7;
  font-size: 16px;
}

.project-cases {
  padding: 60px 0;
}
.case-card {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
}
.case-card img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  display: block;
}
.case-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,0.4);
  color: #fff;
  padding: 16px 22px;
  font-weight: 500;
  font-size: 16px;
}

/* Form */
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 16px;
}
.form-control {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 16px;
}

/* 咨询页面提交按钮样式 */
.submit-btn{
    display: block;
    width: 100%;
    max-width: 220px;
    margin: 30px auto 0;
    padding: 15px 0;
    background-color: var(--accent);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 17px;
    font-weight: 500;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}
.submit-btn:hover{
    background-color: #b39565;
    box-shadow: 0 4px 12px rgba(200,169,118,0.3);
    transform: translateY(-2px);
}

/* Footer */
footer {
  background: #111;
  color: #ccc;
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 40px;
}
.footer-col h4 {
  color: white;
  margin-bottom: 22px;
  font-size: 18px;
}
.footer-col li {
  list-style: none;
  margin-bottom: 12px;
  font-size: 15px;
}
.copyright {
  text-align: center;
  padding-top: 30px;
  margin-top: 30px;
  border-top: 1px solid #333;
  font-size: 14px;
}

/* Mobile */
@media (max-width:768px) {
  body{
    font-size: 15px;
  }
  .menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: 10px 0;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    display: none;
  }
  .menu.active {
    display: flex;
  }
  .hamburger {
    display: flex;
  }
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
  .carousel {
    height: 460px;
  }
  .carousel-content h1 {
    font-size: 32px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .submenu {
    position: static;
    box-shadow: none;
    background: #f5f5f5;
  }
}
/* 首页视频板块样式 */
.video-wrap{
    padding: 70px 0;
    background: #fafafa;
}
.video-box{
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: stretch;
}
.video-card{
    display: flex;
    flex-direction: column;
    height: 100%;
}
.video-text{
    margin-bottom: 25px;
}
.video-text h2{
    font-size: 36px;
    color: #1a1a1a;
    font-weight: 600;
    margin-bottom: 12px;
}
.video-text .sub-txt{
    font-size: 17px;
    color: #666;
    letter-spacing: 1px;
}
.video-container{
    flex: 1;
    width: 100%;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}
.video-container video{
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
/* 手机端：单列 文字在上 视频在下 */
@media (max-width:768px){
    .video-box{
        grid-template-columns: 1fr;
        gap: 50px;
    }
    .video-text h2{
        font-size: 28px;
    }
}

/* 案例详情页样�?*/
.detail-section {
    padding: 60px 0;
}
.detail-block {
    margin-bottom: 50px;
}
.detail-block h3 {
    font-size: 26px;
    color: #1a1a1a;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}
.img-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 25px;
}
.img-grid img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.detail-video-box {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}
.detail-video-box video {
    width: 100%;
    display: block;
}
.case-back-btn {
    text-align: center;
    margin-top: 40px;
}
.case-back-btn a {
    display: inline-block;
    padding: 12px 30px;
    background: var(--accent);
    color: #fff;
    border-radius: 4px;
    font-size: 16px;
    transition: 0.3s;
}
.case-back-btn a:hover {
    background: #b39565;
}

@media (max-width:768px){
    .img-grid {
        grid-template-columns: 1fr 1fr;
    }
    .detail-block h3 {
        font-size: 22px;
    }
}
@media (max-width:480px){
    .img-grid {
        grid-template-columns: 1fr;
    }
}

/* 图片放大弹窗样式 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  cursor: zoom-out;
}
.modal-overlay.active {
  display: flex;
}
.modal-img {
  max-width: 90%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: 0 0 40px rgba(0,0,0,0.3);
}
.modal-close {
  position: fixed;
  top: 25px;
  right: 30px;
  font-size: 40px;
  color: #fff;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 10000;
  transition: 0.2s;
}
.modal-close:hover {
  color: var(--accent);
  transform: rotate(90deg);
}

/* ====================== Join Us ����ҳ����ʽ ====================== */
.joinus-section{
    background: #fff;
}
.joinus-title{
    font-size: 32px;
    color: var(--primary);
    text-align: center;
    margin-bottom: 10px;
}
.joinus-subtitle{
    font-size: 20px;
    color: var(--accent);
    text-align: center;
    margin-bottom: 35px;
    font-weight: 500;
}
.joinus-text{
    font-size: 16px;
    color: #333;
    line-height: 1.8;
    margin-bottom: 18px;
    text-align: justify;
}
.joinus-list-title{
    font-size: 20px;
    margin: 30px 0 20px;
    color: #222;
}
.joinus-list{
    padding-left: 20px;
    margin-bottom: 30px;
}
.joinus-list li{
    font-size: 16px;
    line-height: 1.9;
    color: #333;
    list-style: disc;
}
.joinus-contact{
    margin-top: 40px;
    padding: 25px;
    background: #f9f9f9;
    border-radius: 8px;
    border-left: 4px solid var(--accent);
}
.joinus-contact p{
    font-size: 17px;
    margin-bottom: 12px;
}

@media (max-width:768px){
    .joinus-title{
        font-size: 26px;
    }
    .joinus-subtitle{
        font-size: 18px;
    }
}
/* ��Ƶ����+�Զ��岥�Ű�ť */
.video-container {
  position: relative;
}
.video-container video {
  pointer-events: none;
}
.video-poster {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 2;
  cursor: pointer;
  transition: opacity 0.4s ease;
}
.play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
  cursor: pointer;
  transition: all 0.3s ease;
}
.play-icon::after {
  content: "";
  width: 0;
  height: 0;
  border-top: 16px solid transparent;
  border-bottom: 16px solid transparent;
  border-left: 28px solid #fff;
  margin-left: 4px;
}
.video-container:hover .play-icon {
  background: rgba(200,169,118,0.6);
  transform: translate(-50%, -50%) scale(1.1);
}
.video-container.playing .video-poster,
.video-container.playing .play-icon {
  opacity: 0;
  pointer-events: none;
}