:root {
  --primary-color:#FF8C42;
  --secondary-color: #333;
  --light-gray: #f7f7f7;
  --dark-gray: #505b68;
  --medium-gray: #959799;
  --white: #fff;
  --black: #000;
  --font-primary: 'PingFang SC','Noto Sans SC', 'Source Han Sans',思源黑体,  sans-serif;
  --container-width: 1200px;
  --header-height: 70px;
  --mobile-header-height: 60px;
}
/* Introduction Section Styles */
.intro-section {
  padding: 80px 0;
  background-color: var(--white);
}

.intro-section .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

.intro-content {
  flex: 1;
  padding-right: 50px;
  min-width: 300px;
}

.intro-text {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--dark-gray);
}

.video-container {
  flex: 1;
  min-width: 300px;
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

#intro-video {
  width: 100%;
  display: block;
}

.video-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  padding: 20px;
  display: flex;
  align-items: center;
}

.play-button, .volume-button {
  background: none;
  border: none;
  cursor: pointer;
  margin-right: 10px;
}

.play-button svg, .volume-button svg {
  width: 24px;
  height: 24px;
  fill: var(--white);
}

.progress-bar {
  flex: 1;
  height: 4px;
  background-color: rgba(255, 255, 255, 0.3);
  margin: 0 10px;
  border-radius: 2px;
  overflow: hidden;
}

.progress {
  height: 100%;
  background-color: var(--primary-color);
  width: 0;
}

.time-display {
  color: var(--white);
  font-size: 14px;
  margin-right: 10px;
}

/* Key Statistics Section Styles */
.stats-section {
  padding: 80px 0;
  background-color: var(--light-gray);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.stat-card {
  background-color: var(--white);
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.stat-number {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.stat-desc {
  font-size: 1rem;
  color: var(--dark-gray);
}

/* Timeline Section Styles */
.timeline-section {
  padding: 80px 0;
  background-color: var(--white);
}

.timeline-navigation {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--medium-gray);
  padding-bottom: 15px;
    padding-top: 15px;
  overflow-x: auto;
  gap: 5px;
}

.year-btn {
  background: none;
  border: none;
  padding: 8px 15px;
  font-size: 1rem;
  color: var(--dark-gray);
  cursor: pointer;
  border-radius: 4px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.year-btn:hover {
  background-color: var(--light-gray);
}

.year-btn.active_about {
  background-color: var(--primary-color);
  color: var(--white);
}

.timeline-content {
  padding: 20px;
  border-radius: 8px;
  background-color: var(--light-gray);
}

.timeline-item {
  display: none;
}

.timeline-item.active_about {
  display: block;
}
.banner-title {
  font-size: 2.2rem;
}

.banner-desc {
  font-size: 1rem;
}

.hero-banner {
  height: 80vh;
  min-height: 500px;
}
.btn-primary {
  padding: 10px 20px;
  font-size: 0.9rem;
}
/* Hero Banner Styles */
.hero-banner {
  position: relative;
  height: 100vh;
  min-height: 600px;
  max-height: 800px;
  overflow: hidden;
  /*margin-top: var(--header-height);*/
}

.banner-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.banner-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.banner-content {
  /*position: absolute;*/
  /*bottom: 10%;*/
  /*left: 0;*/
  /*width: 100%;*/
  /*padding: 0 20px;*/
  /*color: var(--white);*/
  /*max-width: var(--container-width);*/
  /*margin: 0 auto;*/
  /*left: 50%;*/
  /*transform: translateX(-50%);*/

    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 0 20px;
    color: var(--white);
    max-width: var(--container-width);
    text-align: center;
    max-width: 600px;
}

.banner-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.banner-desc {
  font-size: 1.2rem;
  max-width: 600px;
  margin-bottom: 2rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.btn-primary {
  display: inline-block;
  background-color: var(--primary-color);
  color: var(--white);
  padding: 12px 24px;
  border-radius: 4px;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

.btn-primary:hover {
  background-color: #b71c22;
}

/* 技术方案卡片优化 */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 40px 0;
}

.solution-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.solution-img-container {
    position: relative;
    padding-top: 60%;
    overflow: hidden;
}

.solution-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.solution-content {
    padding: 25px;
}

.solution-title {
    font-size: 1.4rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.solution-description {
    color: var(--dark-gray);
    line-height: 1.6;
    margin-bottom: 20px;
}

.solution-btn {
    display: inline-block;
    padding: 10px 25px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 25px;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.solution-btn:hover {
    background-color: #e67e00;
}

/* 视频播放器优化 */
.video-container {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-container:hover .video-overlay {
    opacity: 1;
}

.play-button {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.play-button:hover {
    transform: scale(1.1);
}

/* 时间轴优化 */
.timeline-navigation {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.year-btn {
    padding: 10px 25px;
    border: 2px solid var(--primary-color);
    border-radius: 25px;
    background: transparent;
    color: var(--primary-color);
    font-weight: 500;
    transition: all 0.3s ease;
}

.year-btn:hover {
    background: var(--primary-color);
    color: var(--white);
}

.year-btn.active_about {
    background: var(--primary-color);
    color: var(--white);
}

.timeline-content {
    background: var(--light-gray);
    border-radius: 12px;
    padding: 30px;
    margin-top: 20px;
}

.timeline-item {
    display: none;
    animation: fadeIn 0.5s ease;
}

.timeline-item.active_about {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 响应式优化 */
@media (max-width: 768px) {
    .banner-content {
        width: 100%;
        text-align: center;
    }
    .hero-banner {
        height: 60vh;
        min-height: 400px;
    }
    
    .banner-title {
        font-size: 2.5rem;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .intro-section .container {
        flex-direction: column;
    }
    
    .intro-content {
        padding-right: 0;
        margin-bottom: 30px;
    }
}

/* 视差滚动效果 */
.parallax-section {
    position: relative;
    overflow: hidden;
}

.parallax-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 120%;
    background-size: cover;
    background-position: center;
    transform: translateZ(-1px) scale(2);
    z-index: -1;
}

/* 滚动动画 */
[data-aos] {
    opacity: 0;
    transition-property: transform, opacity;
}

[data-aos="fade-up"] {
    transform: translateY(50px);
}

[data-aos="fade-down"] {
    transform: translateY(-50px);
}

[data-aos="fade-right"] {
    transform: translateX(-50px);
}

[data-aos="fade-left"] {
    transform: translateX(50px);
}

[data-aos="zoom-in"] {
    transform: scale(0.8);
}

[data-aos="zoom-out"] {
    transform: scale(1.2);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translate(0) scale(1);
}

/* 技术方案卡片动画增强 */
.solution-card {
    transform: perspective(1000px) rotateX(0deg);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.solution-card:hover {
    transform: perspective(1000px) rotateX(5deg) translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.solution-img-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.3));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.solution-card:hover .solution-img-container::after {
    opacity: 1;
}

/* 视频播放器动画增强 */
.video-container {
    transform: perspective(1000px) rotateY(0deg);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.video-container:hover {
    transform: perspective(1000px) rotateY(5deg);
}

.play-button {
    transform: scale(0.9);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.play-button:hover {
    transform: scale(1.1) rotate(360deg);
}

/* 时间轴动画增强 */
.timeline-navigation {
    perspective: 1000px;
}

.year-btn {
    transform-style: preserve-3d;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.year-btn:hover {
    transform: translateY(-5px) rotateX(10deg);
}

.year-btn.active_about {
    transform: translateY(-5px) rotateX(10deg);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.timeline-item {
    transform-origin: top center;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.timeline-item.active_about {
    animation: timelineItemAppear 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes timelineItemAppear {
    0% {
        opacity: 0;
        transform: translateY(30px) rotateX(10deg);
    }
    100% {
        opacity: 1;
        transform: translateY(0) rotateX(0);
    }
}

/* 统计卡片动画 */
.stat-card {
    transform-style: preserve-3d;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.stat-card:hover {
    transform: translateY(-10px) rotateX(5deg);
}

.stat-number {
    transition: all 0.3s ease;
}

.stat-card:hover .stat-number {
    transform: scale(1.1);
    color: var(--primary-color);
}

/* 响应式动画优化 */
@media (max-width: 768px) {
    [data-aos] {
        transform: none !important;
    }
    
    .solution-card:hover {
        transform: translateY(-5px);
    }
    
    .video-container:hover {
        transform: none;
    }
}