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

body {
  font-family: 'Roboto', sans-serif;
  color: #333;
  overflow-x: hidden;
  background-color: #fff;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* 头部导航样式 */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 20px 0;
  background-color: transparent;
  transition: all 0.3s ease;
}

header.scrolled {
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
}

header.scrolled .logo-text {
  color: #fff;
}

header.scrolled nav ul li a {
  color: #fff;
}

header.scrolled nav ul li a:hover {
  color: #2e82ff;
}

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

.header-left,
.header-right {
  display: flex;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  width: 40px;
  height: 40px;
  /* border-radius: 50%; */
  object-fit: contain;
  margin-right: 10px;
}

.logo-text {
  color: #2e82ff;
  font-size: 1.8rem;
  font-weight: 700;
}

nav ul {
  display: flex;
  list-style: none;
}

nav ul li {
  margin: 0 15px;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: color 0.3s ease;
}

nav ul li a:hover {
  color: #2e82ff;
}

.dropdown-arrow {
  font-size: 0.8rem;
  margin-left: 5px;
}

/* 英雄区域 */
.hero-section {

  background-size: cover;
  background-position: center;
  height: 60vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  margin-top: 0;
}

.dream-c-header-back-img {
  background-image: url('images/dream-tools-c-bg.png');
}
.dream-its-header-back-img {
  background-image: url('images/dream-tools-its-bg.png');
}

.dream-header-back-img {
  background-image: url('images/dream-s-header-back.png');
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.4));
  z-index: 1;
}

/* Hologram 效果 */
.hologram-container {
  position: absolute;
  top: 0;
  right: 0;
  width: 70%;
  height: 100%;
  z-index: 2;
  overflow: hidden;
}

.hologram-figure {
  position: absolute;
  top: 50%;
  right: 15%;
  transform: translateY(-50%);
  width: 250px;
  height: 400px;
  background-image: url('images/hologram-figure.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: drop-shadow(0 0 15px rgba(46, 130, 255, 0.8));
  opacity: 0.8;
}

.child-silhouette {
  position: absolute;
  bottom: 15%;
  left: 20%;
  width: 150px;
  height: 180px;
  background-image: url('images/child-silhouette.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.7;
}

.hologram-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(circle, rgba(46, 130, 255, 0.1) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.3;
}

.data-visualization {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.data-point {
  position: absolute;
  width: 200px;
  height: 100px;
  border: 1px solid rgba(46, 130, 255, 0.5);
  border-radius: 5px;
  background-color: rgba(46, 130, 255, 0.1);
  box-shadow: 0 0 10px rgba(46, 130, 255, 0.3);
}

.data-point:nth-child(1) {
  top: 30%;
  right: 50%;
  transform: rotate(-15deg);
}

.data-point:nth-child(2) {
  top: 40%;
  right: 30%;
  transform: rotate(10deg);
}

.data-point:nth-child(3) {
  top: 60%;
  right: 40%;
  transform: rotate(-5deg);
}

.hero-content {
  position: relative;
  z-index: 3;
  width: 50%;
}

.hero-section h1 {
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  margin-left: 80px;
}

/* 响应式设计 */
@media (max-width: 1400px) {
  .hero-content {
    padding: 0 40px;
  }

  .hologram-figure {
    right: 12%;
  }
}

@media (max-width: 1200px) {
  .hero-section h1 {
    font-size: 2.5rem;
    margin-left: 50px;
  }

  .hologram-figure {
    width: 300px;
    height: 600px;
    right: 10%;
  }
}

@media (max-width: 992px) {
  .overview-content {
    flex-direction: column;
  }

  .overview-image {
    flex: 0 0 100%;
    margin-bottom: 0;
    padding: 40px 40px 20px 40px;
  }

  .overview-text {
    padding: 20px 40px 40px 40px;
  }

  .key-features {
    flex-wrap: wrap;
  }

  .feature-box {
    flex: 0 0 calc(50% - 10px);
  }

  .hero-section h1 {
    font-size: 2.2rem;
    margin-left: 40px;
  }

  .hero-content {
    width: 70%;
  }

  .hologram-figure {
    width: 250px;
    height: 500px;
    right: 5%;
  }

  .child-silhouette {
    width: 200px;
    height: 250px;
    left: 10%;
  }

  .domains-diagram {
    height: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .domain {
    position: static;
    width: 100%;
    margin-bottom: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .domain-circle {
    position: static;
    transform: none;
    margin-bottom: 20px;
  }

  .domain-details {
    position: static;
    transform: none;
    text-align: center;
    width: 100%;
    max-width: 500px;
    padding: 15px;
    border-radius: 15px;
  }

  .domain-1 .domain-details,
  .domain-2 .domain-details,
  .domain-3 .domain-details,
  .domain-4 .domain-details {
    left: auto;
    right: auto;
    text-align: center;
    padding: 15px;
    border-radius: 15px;
  }

  /* 在移动设备上统一所有域的列表项样式 */
  .domain-1 .domain-details li,
  .domain-2 .domain-details li,
  .domain-3 .domain-details li,
  .domain-4 .domain-details li {
    text-align: left;
    padding-left: 20px;
    padding-right: 0;
  }

  .domain-1 .domain-details li:before,
  .domain-2 .domain-details li:before,
  .domain-3 .domain-details li:before,
  .domain-4 .domain-details li:before {
    content: '• ';
    left: 0;
    right: auto;
  }

  .domain-1 .domain-details li:after,
  .domain-2 .domain-details li:after,
  .domain-3 .domain-details li:after,
  .domain-4 .domain-details li:after {
    content: '';
  }

  .center-word {
    position: static;
    transform: none;
    margin: 30px 0;
  }

  .connecting-lines {
    display: none;
  }

  .featured-book {
    width: 100%;
    flex-direction: column;
    padding: 20px;
    background-color: transparent;
    box-shadow: none;
  }

  .book-card {
    flex: 0 0 auto;
    margin-right: 0;
    margin-bottom: 20px;
    max-width: 250px;
    margin-left: auto;
    margin-right: auto;
  }

  .book-info {
    text-align: left;
    background-color: rgba(255, 255, 255, 0.6);
    padding: 15px;
    border-radius: 10px;
    margin-top: 0;
    margin-left: auto;
    margin-right: auto;
    max-width: 90%;
  }
}

@media (max-width: 768px) {
  .product-navigation .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .breadcrumb {
    margin-top: 15px;
  }

  .overview-image {
    padding: 30px 30px 15px 30px;
  }

  .overview-text {
    padding: 15px 30px 30px 30px;
  }

  .feature-box {
    flex: 0 0 100%;
  }

  nav ul {
    display: none;
  }

  .hero-section h1 {
    font-size: 2rem;
    margin-left: 20px;
  }

  .hero-content {
    width: 90%;
  }

  .hologram-figure {
    width: 200px;
    height: 400px;
    right: 0;
    opacity: 0.6;
  }

  .child-silhouette {
    display: none;
  }

  .hero-section {
    height: 90vh;
  }

  header {
    padding: 15px 0;
  }
}

@media (max-width: 480px) {
  .overview-image {
    padding: 20px 20px 10px 20px;
  }

  .overview-text {
    padding: 10px 20px 20px 20px;
  }

  .logo-text {
    font-size: 1.5rem;
  }

  .hero-section h1 {
    font-size: 1.8rem;
    margin-left: 10px;
  }

  .hero-content {
    width: 100%;
    padding: 0;
  }

  .hologram-figure {
    width: 150px;
    height: 300px;
    opacity: 0.4;
  }
}

/* 产品导航部分 */
.product-navigation {
  background-color: #fff;
  padding: 20px 0;
}

.product-navigation .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.product-tabs {
  display: flex;
}

.product-tabs .tab {
  font-size: 16px;
  font-weight: 500;
  color: #888;
  text-decoration: none;
  margin-right: 30px;
  padding: 0 5px 10px;
  position: relative;
  transition: color 0.3s ease;
}

.product-tabs .tab.active {
  color: #2e82ff;
  font-weight: 600;
}

.product-tabs .tab.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: #2e82ff;
}

.breadcrumb {
  font-size: 14px;
  color: #888;
}

.breadcrumb a {
  color: #888;
  text-decoration: none;
}

.breadcrumb .separator {
  margin: 0 5px;
  color: #888;
}

.breadcrumb .current {
  color: #2e82ff;
}

/* 产品概述部分 */
.product-overview {
  padding: 60px 0;
  background-color: #fff;
}

.overview-content {
  display: flex;
  gap: 60px;
  background-color: #F5F8FF;
  border-radius: 20px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.overview-image {
  flex: 0 0 45%;
  border-radius: 15px;
  overflow: hidden;
  /* padding: 40px 0 40px 40px; */
}

.overview-image img {
  width: 100%;
  height: 510px;
  display: block;
  border-radius: 15px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  object-fit: cover;
}

.overview-text {
  flex: 1;
  padding: 20px 15px 20px 0;
}

.overview-text h2 {
  font-size: 32px;
  font-weight: 700;
  color: #2e82ff;
  margin-bottom: 35px;
  text-transform: uppercase;
}

.overview-text p {
  font-size: 18px;
  line-height: 1.5;
  color: #666;
  margin-bottom: 25px;
  font-weight: 300;
}

.key-features {
  display: flex;
  gap: 30px;
  margin-top: 40px;
}

.feature-box {
  flex: 1;
  background-color: #E5EDFF;
  border-radius: 10px;
  padding: 25px 15px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.feature-value {
  font-size: 22px;
  font-weight: 700;
  color: #2e82ff;
  margin-bottom: 15px;
}

.feature-label {
  font-size: 16px;
  color: #666;
  font-weight: 400;
}

/* 语言域评估部分 */
.language-domains {
  background-color: #EDF3FF;
  padding: 80px 0;
}

.language-domains .container {
  max-width: 1200px;
}

.language-domains h2 {
  font-size: 32px;
  color: #2e82ff;
  text-align: left;
  margin-bottom: 30px;
  font-weight: 600;
}

.domain-intro {
  text-align: left;
  font-size: 18px;
  color: #333;
  margin-bottom: 80px;
  line-height: 1.5;
}

.domains-diagram {
  position: relative;
  width: 100%;
  height: 350px;
  margin: 0 auto;
}

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

.circle-border {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 3px dashed #000;
  z-index: 2;
}

.center-word {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 45px;
  font-weight: 800;
  color: #000;
  z-index: 5;
}

.domain {
  position: absolute;
  width: 45%;

}

.domain-1 {
  top: 10%;
  left: 0;
  z-index: 400;
}

.domain-2 {
  top: 10%;
  right: 0;
  z-index: 400;
}

.domain-3 {
  bottom: 10%;
  left: 0;
  z-index: 400;
}

.domain-4 {
  bottom: 10%;
  right: 0;
  z-index: 400;
}

.domain-circle {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-weight: 700;
  font-size: 20px;
  color: #000;
  position: absolute;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.05);
}

.domain-1 .domain-circle {
  background-color: #FFD3D0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.domain-2 .domain-circle {
  background-color: #D0F8FF;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}

.domain-3 .domain-circle {
  background-color: #FFFDD0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.domain-4 .domain-circle {
  background-color: #D0DAFF;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
}

.domain-details {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  padding: 20px;
  height: 140px;
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  justify-content: center;
  z-index: -50;
}

.domain-details li {
  margin-bottom: 15px;
  font-size: 16px;
  color: #333;
  position: relative;
  line-height: 1.4;
}

/* 添加域详情样式 */
.domain-1 .domain-details {
  right: 150px;
  text-align: right;
  align-items: flex-end;
  /* 确保内容靠右对齐 */

  background: linear-gradient(to left, rgba(255, 160, 153, 1), rgba(255, 160, 153, 0));
  border-top-left-radius: 30px;
  border-bottom-left-radius: 30px;
  padding-right: 40px;
}

.domain-2 .domain-details {
  left: 150px;
  text-align: left;
  background: linear-gradient(to right, rgba(153, 240, 255, 1), rgba(153, 240, 255, 0));
  border-top-right-radius: 30px;
  border-bottom-right-radius: 30px;
  padding-left: 40px;
}

.domain-3 .domain-details {
  right: 150px;
  text-align: right;
  align-items: flex-end;
  /* 确保内容靠右对齐 */
  background: linear-gradient(to left, rgba(255, 251, 153, 1), rgba(255, 251, 153, 0));
  border-top-left-radius: 30px;
  border-bottom-left-radius: 30px;
  padding-right: 40px;
}

.domain-4 .domain-details {
  left: 150px;
  text-align: left;
  background: linear-gradient(to right, rgba(153, 175, 255, 1), rgba(153, 175, 255, 0));
  border-top-right-radius: 30px;
  border-bottom-right-radius: 30px;
  padding-left: 40px;
}

.domain-details ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  width: 100%;
  /* 确保列表占据整个宽度 */
}

/* 默认样式用于左侧圆圈的域（domain-2和domain-4） */
.domain-details li {
  padding-left: 20px;
  padding-right: 0;
}

.domain-details li:before {
  content: '• ';
  color: #333;
  position: absolute;
  left: 0;
}

.domain-details li:after {
  content: '';
}

/* 右侧圆圈的域（domain-1和domain-3）样式 */
.domain-1 .domain-details li,
.domain-3 .domain-details li {
  padding-left: 0;
  padding-right: 20px;
  text-align: right;
  width: 100%;
  display: block;
}

.domain-1 .domain-details li:before,
.domain-3 .domain-details li:before {
  content: '';
  display: none;
}

.domain-1 .domain-details li:after,
.domain-3 .domain-details li:after {
  content: ' •';
  color: #333;
  position: absolute;
  right: 0;
}

/* 响应式调整 */
@media (max-width: 1200px) {
  .domains-diagram {
    height: 500px;
  }
}

@media (max-width: 480px) {
  .domain-circle {
    width: 150px;
    height: 150px;
    font-size: 18px;
  }

  .center-word {
    font-size: 36px;
  }
}

/* DREAM-C展示部分样式 */
.dream-c-showcase {
  background-color: #fff;
  padding: 80px 0;
  text-align: center;
  overflow: hidden;
}

.big-dream-c-logo {
  font-size: 250px;
  font-weight: 700;
  color: #EDF3FF;
  margin-bottom: 0;
  line-height: 1;
  letter-spacing: -5px;
  text-shadow: 10px 10px 15px #EDF3FF
}

.big-dream-s-logo-pink {
  color: #fde8e4;
  text-shadow: 10px 10px 15px #fde8e4
}
.big-dream-its-logo {
  font-size: 250px;
  font-weight: 700;
  color: #EDF3FF;
  margin-bottom: 0;
  line-height: 1;
  letter-spacing: -5px;
  text-shadow: 10px 10px 15px #EDF3FF
}

.big-dream-its-logo-pink {
  color: #a9cf52;
  text-shadow: 10px 10px 15px #a9cf52
}
.big-dream-3t-logo-pink {
  color: #009fe7;
  text-shadow: 10px 10px 15px #009fe7
}
.big-dream-mtz-logo-pink {
  color: #a6e2ff;
  text-shadow: 10px 10px 15px #a6e2ff
}
.big-dream-ment-t-logo-pink {
  color: #da9464;
  text-shadow: 10px 10px 15px #da9464
}
.big-dream-swamt-t-logo-pink {
  color: #dcc6df;
  text-shadow: 10px 10px 15px #dcc6df
}
.big-dream-it-logo-pink {
  color: #fabe00;
  text-shadow: 10px 10px 15px #fabe00
}
.big-dream-ment-logo {
  font-size: 200px;
  font-weight: 700;
  color: #EDF3FF;
  margin-bottom: 0;
  line-height: 1;
  letter-spacing: -5px;
  text-shadow: 10px 10px 15px #EDF3FF
}
.big-dream-ment-logo-pink {
  color: #b05e1a;
  text-shadow: 10px 10px 15px #b05e1a
}
.big-dream-swam-ai-logo-pink {
  color: #8c689e;
  text-shadow: 10px 10px 15px #8c689e
}
.big-dream-sppa-logo-pink {
  color: #417fa6;
  text-shadow: 10px 10px 15px #417fa6
}
.showcase-content {
  position: relative;
  max-width: 600px;
  margin: -40px auto 0;
  z-index: 2;
}

.tablet-display {
  position: relative;
  padding: 0 20px;
  max-width: 800px;
  margin: 0 auto;
}

.tablet-display img {
  max-width: 120%;
  height: auto;
  display: block;
  margin: 0 -10%;
  position: relative;
  z-index: 3;
}

.floating-icons {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
}

.floating-icons .icon {
  position: absolute;
  width: 60px;
  height: 60px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.icon-1 {
  top: 15%;
  left: 5%;
  transform: rotate(-15deg);
}

.icon-2 {
  bottom: 25%;
  right: 8%;
  transform: rotate(10deg);
}

.icon-3 {
  top: 70%;
  left: 15%;
  transform: rotate(5deg);
}

.showcase-footer {
  margin-top: 30px;
}

.full-name {
  font-size: 18px;
  color: #333;
  margin-bottom: 15px;
}

.contact-link {
  margin-bottom: 20px;
}

.contact-link a {
  color: #2e82ff;
  text-decoration: none;
  font-size: 16px;
  transition: color 0.3s;
}

.contact-link a:hover {
  text-decoration: underline;
}

.app-store-button {
  display: inline-block;
}

.app-store-button img {
  height: 50px;
  width: auto;
}

/* 响应式调整 */
@media (max-width: 992px) {
  .big-dream-c-logo {
    font-size: 150px;
  }
}

@media (max-width: 768px) {
  .big-dream-c-logo {
    font-size: 100px;
  }
}

@media (max-width: 480px) {
  .big-dream-c-logo {
    font-size: 70px;
  }
}

/* 视频展示区 */
.video-gallery {
  padding: 80px 0;
  background-color: #fff !important;
}

.video-gallery h2 {
  font-size: 32px;
  color: #2e82ff;
  margin-bottom: 50px;
  text-align: center;
  font-weight: 600;
}

.video-container {
  display: flex;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.video-player {
  flex: 0 0 65%;
}

.video-frame {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%;
  /* 16:9 比例 */
  background-color: #000;
  border-radius: 15px;
  overflow: hidden;
  margin-bottom: 20px;
}

.current-preview {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(46, 130, 255, 0.8);
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.3s;
}

.play-button:hover {
  background-color: rgba(46, 130, 255, 1);
}

.play-button img {
  width: 30px;
  height: 30px;
}

.video-title {
  font-size: 24px;
  font-weight: 600;
  color: #333;
  margin-bottom: 15px;
}

.video-description {
  font-size: 16px;
  color: #666;
  line-height: 1.5;
}

.video-playlist {
  flex: 0 0 30%;
  max-height: 500px;
  overflow-y: auto;
  position: relative;
  scrollbar-width: none;
  /* Firefox */
  -ms-overflow-style: none;
  /* IE and Edge */
  border-radius: 10px;
  background-color: #f5f8ff;
  padding: 15px;
}

.video-playlist::-webkit-scrollbar {
  display: none;
  /* Chrome, Safari, Opera */
}

.playlist-item {
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-bottom: 10px;
  border: 1px solid #e0e0e0;
  min-height: 85px;
}

.playlist-item:hover {
  background-color: #e0eaff;
  border-color: #b0c8ff;
  transform: translateX(3px);
}

.playlist-item.active {
  background-color: #d0e0ff;
  border-left: 3px solid #2e82ff;
}

.item-content {
  display: flex;
  flex-direction: row;
  gap: 10px;
  align-items: center;
}

.thumbnail {
  width: 100px;
  height: 60px;
  flex-shrink: 0;
  border-radius: 6px;
  overflow: hidden;
  background-color: #f0f0f0;
}

.thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.item-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.item-title {
  font-size: 14px;
  font-weight: 500;
  color: #333;
  line-height: 1.3;
}

.item-duration {
  font-size: 12px;
  color: #888;
}

.scroll-controls {
  position: sticky;
  bottom: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 10px 0 0;
  background-color: #f5f8ff;
  width: 100%;
}

.scroll-up,
.scroll-down {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background-color: rgba(46, 130, 255, 0.2);
  color: #2e82ff;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.scroll-up:hover,
.scroll-down:hover {
  background-color: rgba(46, 130, 255, 0.4);
  transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .video-container {
    max-width: 95%;
  }
}

@media (max-width: 992px) {
  .video-container {
    flex-direction: column;
  }

  .video-player,
  .video-playlist {
    flex: 0 0 100%;
  }

  .video-playlist {
    max-height: 300px;
  }
}

@media (max-width: 768px) {
  .play-button {
    width: 60px;
    height: 60px;
  }

  .play-button img {
    width: 24px;
    height: 24px;
  }

  .video-title {
    font-size: 20px;
  }
}

/* Norms, Validity And Reliability Section */
.norms-validity {
  padding: 60px 0;
  background-color: #fff;
  color: #333;
}

.norms-validity h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

.norms-validity p {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 2rem;
  text-align: left;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

/* JSLHR Research Article Display */
.jslhr-research {
  display: flex;
  max-width: 1000px;
  margin: 40px auto;
  gap: 20px;
}

.jslhr-left {
  flex: 2.5;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.jslhr-right {
  flex: 1.5;
}

.jslhr-left .validity-notice {
  margin-top: 0;
  margin-bottom: 0;
  border-radius: 0 0 8px 8px;
  max-width: 100%;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  border-top: none;
}

.jslhr-left img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  border-radius: 8px 8px 0 0;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.jslhr-right img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

/* Responsive Styles for JSLHR Research */
@media (max-width: 768px) {
  .jslhr-research {
    flex-direction: column;
  }

  .jslhr-right,
  .jslhr-left {
    max-width: 100%;
    margin-bottom: 20px;
  }

  .jslhr-left {
    margin-bottom: 0;
  }

  .jslhr-right {
    order: -1;
    /* Display right image on top on mobile */
  }

  .jslhr-left img,
  .jslhr-right img {
    max-width: 100%;
  }

  .jslhr-left .validity-notice {
    margin-bottom: 20px;
  }
}

@media (max-width: 576px) {
  .jslhr-research {
    gap: 15px;
  }

  .jslhr-right {
    margin-bottom: 15px;
  }
}

/* DREAM-S Validity Table Styles */
.validity-table {
  max-width: 1000px;
  margin: 40px auto;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.table-header {
  display: flex;
  background-color: #78B4EA;
  color: white;
  font-weight: 600;
  text-align: center;
}

.table-row {
  display: flex;
  background-color: #E8F4FD;
  color: #333
}

.table-row:nth-child(odd) {
  background-color: #D5EAF9;
}

.table-cell {
  flex: 1;
  padding: 15px 20px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 1px solid rgba(255, 255, 255, 0.3);
}

.table-cell:last-child {
  border-right: none;
}

.table-header .table-cell {
  padding: 20px;
  font-size: 1.2rem;
}

.table-row .table-cell {
  font-size: 1.1rem;
}

.validity-notice {
  background-color: #f0f4ff;
  border-radius: 8px;
  padding: 20px 25px;
  margin: 15px auto;
  max-width: 1000px;
  margin-top: 20px !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.validity-notice p {
  margin: 0;
  color: #2e82ff;
  font-size: 1rem;
  line-height: 1.2;
}

/* Journal Link Styles */
.journal-link {
  color: #1565c0;
  text-decoration: none;
  font-weight: 600;
  font-style: italic;
}

/* Research Evidence Styles */
.research-evidence {
  display: flex;
  gap: 20px;
  margin: 40px 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  overflow: hidden;
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.journal-cover {
  flex: 0 0 38%;
  background-color: #1565c0;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.journal-cover img {
  width: 100%;
  border-radius: 6px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.research-paper {
  flex: 0 0 62%;
  background-color: #fff;
  padding: 0;
}

.paper-header {
  display: flex;
  align-items: center;
  padding: 10px 20px;
  border-bottom: 1px solid #e0e0e0;
}

.journal-logo {
  height: 36px;
  margin-right: 20px;
}

.journal-nav {
  display: flex;
  gap: 15px;
}

.journal-nav a {
  text-decoration: none;
  color: #444;
  font-size: 0.9rem;
  font-weight: 600;
}

.paper-content {
  padding: 25px 20px;
}

.access-info {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.journal-name,
.content-type,
.pub-date {
  color: #666;
  position: relative;
}

.journal-name:after,
.content-type:after {
  content: "|";
  margin-left: 15px;
  color: #ccc;
}

.paper-title {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  color: #333;
}

.paper-authors {
  font-size: 1rem;
  margin-bottom: 15px;
  color: #444;
}

.paper-doi {
  font-size: 0.9rem;
  color: #666;
  margin-top: 15px;
}

.notice {
  background-color: #e8f4fd;
  border: 1px solid #b3e0ff;
  border-radius: 8px;
  padding: 20px;
  margin: 30px auto;
  max-width: 1000px;
}

.notice p {
  margin: 0;
  color: #0277bd;
  font-size: 1rem;
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .research-evidence {
    flex-direction: column;
  }

  .journal-cover,
  .research-paper {
    flex: 0 0 100%;
  }

  .journal-cover {
    padding: 30px;
  }

  .journal-cover img {
    max-width: 400px;
  }

  .paper-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .journal-logo {
    margin-bottom: 10px;
    margin-right: 0;
  }

  .journal-nav {
    flex-wrap: wrap;
  }
}

@media (max-width: 768px) {
  .norms-validity h2 {
    font-size: 2rem;
  }

  .paper-title {
    font-size: 1.4rem;
  }

  .access-info {
    flex-wrap: wrap;
  }

  .journal-name:after,
  .content-type:after {
    display: none;
  }

  .journal-name,
  .content-type,
  .pub-date {
    margin-right: 10px;
  }
}

@media (max-width: 480px) {
  .norms-validity h2 {
    font-size: 1.8rem;
  }

  .notice {
    padding: 15px;
  }
}

/* DREAM-S Reports Showcase */
.dream-s-reports {
  padding: 80px 0;
  background-color: #f5f9ff;
  position: relative;
  overflow: hidden;
}

.report-background-circles {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 1;
}

.circle-left {
  position: absolute;
  width: 600px;
  height: 600px;
  left: -200px;
  top: -100px;
  border-radius: 50%;
  background-color: #256ce6;
  opacity: 0.8;
}

.circle-right {
  position: absolute;
  width: 800px;
  height: 800px;
  right: -300px;
  bottom: -300px;
  border-radius: 50%;
  background-color: #e3eeff;
  opacity: 0.6;
}

.dream-s-reports .container {
  position: relative;
  z-index: 5;
}

.report-button-container {
  text-align: center;
  margin-bottom: 60px;
}

.report-button {
  display: inline-block;
  padding: 15px 50px;
  background-color: #256ce6;
  color: white;
  font-size: 22px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 50px;
  box-shadow: 0 4px 15px rgba(37, 108, 230, 0.3);
  transition: all 0.3s ease;
}

.report-button:hover {
  background-color: #1d5ac0;
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(37, 108, 230, 0.4);
}

.reports-showcase {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

.report-item {
  flex: 0 0 calc(30% - 20px);
  max-width: 400px;
  perspective: 1000px;
}

.report-card {
  background-color: white;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  transition: transform 0.5s ease, box-shadow 0.5s ease;
  overflow: hidden;
  transform-style: preserve-3d;
}

.report-card:hover {
  transform: translateY(-10px) rotateY(3deg);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.18);
}

.report-card img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.3s ease;
}

/* Responsive Styles */
@media (max-width: 1200px) {
  .report-item {
    flex: 0 0 calc(30% - 20px);
  }
}

@media (max-width: 992px) {
  .reports-showcase {
    gap: 20px;
    flex-wrap: wrap;
  }

  .report-item {
    flex: 0 0 calc(45% - 15px);
  }

  .circle-left {
    width: 400px;
    height: 400px;
    left: -150px;
    top: -50px;
  }

  .circle-right {
    width: 600px;
    height: 600px;
    right: -250px;
    bottom: -250px;
  }
}

@media (max-width: 768px) {
  .report-item {
    flex: 0 0 100%;
    max-width: 450px;
  }

  .reports-showcase {
    gap: 40px;
    flex-wrap: wrap;
  }

  .report-button {
    padding: 12px 40px;
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .dream-s-reports {
    padding: 50px 0;
  }

  .report-button-container {
    margin-bottom: 40px;
  }

  .report-button {
    padding: 10px 30px;
    font-size: 18px;
  }

  .circle-left {
    width: 300px;
    height: 300px;
    left: -150px;
    top: -50px;
  }

  .circle-right {
    width: 400px;
    height: 400px;
    right: -200px;
    bottom: -200px;
  }
}

/* Citations Showcase Section */
.citations-showcase {
  padding: 80px 0;
  background-color: #f5f9ff;
  background-image: url('images/dream-s-books-back.png');
  position: relative;
  background-size: cover;
  text-align: center;
}

.citations-showcase h2 {
  font-size: 2.2rem;
  font-weight: 700;
  color: #333;
  text-align: center;
  margin-bottom: 20px;
}

.blue-divider {
  width: 120px;
  height: 4px;
  background-color: #2e82ff;
  margin: 0 auto 25px;
}

.citations-intro {
  font-size: 1.1rem;
  color: #666;
  margin: 0 auto 50px;
  max-width: 800px;
  text-align: center;
}

.books-carousel {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
}

.carousel-content {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-bottom: 40px;
}

.book-thumbnails {
  display: flex;
  flex-direction: column;
  gap: 15px;
  flex: 0 0 150px;
  height: 400px;
  overflow-y: auto;
  scrollbar-width: none;
  /* Firefox */
  -ms-overflow-style: none;
  /* IE and Edge */
}

.book-thumbnails::-webkit-scrollbar {
  display: none;
  /* Chrome, Safari, Opera */
  width: 0;
}

.book-thumb {
  width: 100%;
  border-radius: 5px;
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  opacity: 0.7;
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.book-thumb:hover {
  opacity: 0.9;
  transform: translateX(3px);
}

.book-thumb.active {
  border-color: #2e82ff;
  opacity: 1;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.book-thumb img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
}

.featured-book {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  border-radius: 15px;
  padding: 30px;
  box-shadow: none;
  margin: 0 auto;
}

.book-card {
  flex: 0 0 400px;
  margin-right: -20px;
  position: relative;
  z-index: 2;
}

.book-card img {
  width: 100%;
  height: auto;
  display: block;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
  border-radius: 5px;
}

.book-info {
  flex: 1;
  background-color: rgba(255, 255, 255, 0.6);
  padding: 25px 25px 25px 45px;
  border-radius: 10px;
  z-index: 1;
  max-width: 500px;
  margin-top: -15%;
}

.book-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: #2e82ff;
  margin-bottom: 15px;
  line-height: 1.3;
  text-align: left;
}

.book-description {
  font-size: 1.1rem;
  color: #333;
  line-height: 1.4;
  text-align: left;
}

.carousel-navigation {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 30px;
}

.carousel-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: #ffffff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.carousel-btn:hover {
  background-color: #2e82ff;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(46, 130, 255, 0.3);
}

.carousel-btn:hover img {
  filter: brightness(0) invert(1);
}

.carousel-btn img {
  width: 20px;
  height: 20px;
  transition: all 0.3s ease;
}

.carousel-indicators {
  display: flex;
  gap: 8px;
}

.indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #d0d0d0;
  cursor: pointer;
  transition: all 0.3s ease;
}

.indicator.active {
  background-color: #2e82ff;
  transform: scale(1.2);
}

/* Responsive styles for book carousel */
@media (max-width: 992px) {
  .carousel-content {
    flex-direction: column;
    gap: 30px;
    align-items: center;
  }

  .book-thumbnails {
    flex-direction: row;
    flex: 0 0 auto;
    width: 100%;
    height: 100px;
    overflow-x: auto;
    overflow-y: hidden;
    justify-content: flex-start;
    padding: 10px 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* IE and Edge */
    white-space: nowrap;
  }

  .book-thumbnails::-webkit-scrollbar {
    display: none;
    /* Chrome, Safari, Opera */
    height: 0;
    width: 0;
  }

  .book-thumb {
    width: 90px;
    height: 90px;
    margin-right: 15px;
    display: inline-block;
  }

  .book-thumb img {
    height: 100%;
    width: 100%;
    object-fit: cover;
  }

  .featured-book {
    width: 100%;
    flex-direction: column;
    padding: 20px;
    background-color: transparent;
    box-shadow: none;
  }

  .book-card {
    flex: 0 0 auto;
    margin-right: 0;
    margin-bottom: 20px;
    max-width: 250px;
    margin-left: auto;
    margin-right: auto;
  }

  .book-info {
    text-align: center;
    background-color: rgba(255, 255, 255, 0.6);
    padding: 15px;
    border-radius: 10px;
    margin-top: 0;
    margin-left: auto;
    margin-right: auto;
    max-width: 90%;
  }

  .book-title {
    font-size: 1.5rem;
  }
}

@media (max-width: 768px) {
  .citations-showcase h2 {
    font-size: 1.8rem;
  }

  .book-thumbnails {
    height: 80px;
  }

  .book-thumb {
    width: 80px;
    height: 80px;
    margin-right: 10px;
  }

  .book-title {
    font-size: 1.3rem;
  }

  .book-description {
    font-size: 1rem;
  }

  .carousel-btn {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .citations-showcase {
    padding: 50px 0;
  }

  .book-thumbnails {
    gap: 8px;
    height: 70px;
  }

  .book-thumb {
    width: 70px;
    height: 70px;
    margin-right: 8px;
  }

  .featured-book {
    padding: 15px;
  }

  .book-card {
    max-width: 200px;
  }

  .carousel-navigation {
    gap: 20px;
  }

  .carousel-btn {
    width: 36px;
    height: 36px;
  }

  .carousel-btn img {
    width: 16px;
    height: 16px;
  }

  .indicator {
    width: 10px;
    height: 10px;
  }
}

/* Team Showcase Section */
.team-showcase {
  padding: 80px 0;
  background-color: #f5f9ff;
  position: relative;
}

.team-showcase h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #2e82ff;
  text-align: center;
  margin-bottom: 50px;
}

.team-carousel {
  position: relative;
  max-width: 1400px;
  margin: 0 auto;
  overflow: hidden;
}

.team-members {
  display: flex;
  gap: 30px;
  transition: transform 0.5s ease;
  width: 100%;
  flex-wrap: nowrap;
}
.example-items {
  display: flex;
  transition: transform 0.5s ease;
  width: 100%;
  flex-wrap: nowrap;
}
.example-card {
  flex: 0 0 calc(33.333% - 20px);
  max-width: 800px;
  overflow: hidden;
  transition: all 0.3s ease;
}
.example-photo {
  width: 100%;
}
.example-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.example-desc {
  width: 100%;
  text-align: center;
  color:#888;
  font-size: 0.8rem;
}
.team-card {
  flex: 0 0 calc(33.333% - 20px);
  max-width: 400px;
  background-color: #ffffff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.team-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.member-photo {
  width: 100%;
  height: 380px;
  overflow: hidden;
}

.member-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.member-name {
  font-size: 1.5rem;
  font-weight: 600;
  color: #333;
  padding: 20px 20px 5px;
  margin: 0;
}

.member-title {
  font-size: 1rem;
  color: #2e82ff;
  font-weight: 500;
  padding: 0 20px 10px;
}

.member-bio {
  font-size: 0.95rem;
  color: #666;
  line-height: 1.5;
  padding: 0 20px 25px;
  margin: 0;
}

.team-navigation {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 30px;
}

.team-nav-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: #ffffff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.team-nav-btn:hover {
  background-color: #2e82ff;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(46, 130, 255, 0.3);
}

.team-nav-btn:hover img {
  filter: brightness(0) invert(1);
}

.team-nav-btn img {
  width: 20px;
  height: 20px;
  transition: all 0.3s ease;
}

.team-indicators {
  display: flex;
  gap: 8px;
}


.team-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #d0d0d0;
  cursor: pointer;
  transition: all 0.3s ease;
}
.example-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #d0d0d0;
  cursor: pointer;
  transition: all 0.3s ease;
}

.team-indicator.active {
  background-color: #2e82ff;
  transform: scale(1.2);
}
.example-indicator.active {
  background-color: #2e82ff;
  transform: scale(1.2);
}
/* Responsive styles for team showcase */
@media (max-width: 1200px) {
  .team-card {
    flex: 0 0 calc(33.333% - 20px);
  }

  .member-photo {
    height: 250px;
  }
}

@media (max-width: 992px) {
  .team-members {
    flex-wrap: wrap;
  }

  .team-card {
    flex: 0 0 calc(50% - 15px);
  }

  .member-photo {
    height: 280px;
  }
}

@media (max-width: 768px) {
  .team-showcase h2 {
    font-size: 2rem;
  }

  .team-card {
    flex: 0 0 100%;
    max-width: 450px;
    margin: 0 auto;
  }

  .member-photo {
    height: 320px;
  }

  .team-nav-btn {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .team-showcase {
    padding: 50px 0;
  }

  .team-showcase h2 {
    font-size: 1.8rem;
    margin-bottom: 30px;
  }

  .member-photo {
    height: 250px;
  }

  .member-name {
    font-size: 1.3rem;
    padding: 15px 15px 5px;
  }

  .member-title {
    font-size: 0.9rem;
    padding: 0 15px 8px;
  }

  .member-bio {
    font-size: 0.85rem;
    padding: 0 15px 20px;
  }

  .team-nav-btn {
    width: 36px;
    height: 36px;
  }

  .team-nav-btn img {
    width: 16px;
    height: 16px;
  }

  .team-indicator {
    width: 10px;
    height: 10px;
  }
  .example-indicator {
    width: 10px;
    height: 10px;
  }
}

/* Footer Styles */
.footer {
  background-color: #f8f9fa;
  padding: 60px 0 0;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo img {
  height: 40px;
  width: auto;
}

.footer-nav {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}

.footer-nav-column {
  min-width: 200px;
}

.footer-nav-column h3 {
  color: #333;
  font-size: 18px;
  margin-bottom: 20px;
  font-weight: 600;
}


.footer-nav-column h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -8px;
  width: 30px;
  height: 2px;
  background-color: #3e80ff;
}

.footer-nav-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav-column ul li {
  margin-bottom: 12px;
}

.footer-nav-column ul li a {
  color: #666;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-nav-column ul li a:hover {
  color: #007bff;
}

.footer-bottom {
  margin-top: 60px;
  padding: 20px 0;
  border-top: 1px solid #eee;
}

.footer-bottom-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.copyright {
  color: #666;
  font-size: 14px;
}

.footer-social {
  display: flex;
  gap: 20px;
}

.footer-social a {
  color: #666;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-social a:hover {
  color: #007bff;
}

/* Responsive Footer Styles */
@media (max-width: 992px) {
  .footer-container {
    flex-direction: column;
    gap: 40px;
  }

  .footer-nav {
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .footer {
    padding: 40px 0 0;
    margin-top: 60px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 30px;
  }

  .footer-nav-column {
    min-width: 100%;
  }

  .footer-bottom-container {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer {
    padding: 30px 0 0;
    margin-top: 40px;
  }

  .footer-nav-column h3 {
    font-size: 16px;
  }
}

/* Operation Guides Section */
.operation-guides {
  padding: 80px 0;
  background-color: #f0f7ff;
  position: relative;
}

.operation-guides h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #333;
  text-align: center;
  margin-bottom: 60px;
}

/* Horizontal layout wrapper */
.operation-content-wrapper {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 50px;
  max-width: 1200px;
  margin: 0 auto;
}

/* Buy button section (left column) */
.buy-button-section {
  flex: 0 0 auto;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 10px;
}

/* Guides section (right column) */
.guides-section {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.guides-container {
  display: flex;
  flex-direction: column;
  gap: 30px;
  align-items: center;
}

.guide-card {
  flex: 0 0 auto;
  width: 100%;
  max-width: 350px;
  background-color: #ffffff;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  padding: 24px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.guide-card:nth-child(1) {
  margin-top: 4px;
}

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

.guide-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 25px;
  opacity: 0.8;
}

.guide-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: invert(39%) sepia(58%) saturate(2258%) hue-rotate(201deg) brightness(101%) contrast(92%);
}

.guide-title {
  font-size: 1.1rem !important;
  font-weight: 600;
  color: #333;
  margin-bottom: 25px;
  line-height: 1.4;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #3183ff;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.download-btn:hover {
  color: #1a68d3;
  text-decoration: underline;
}

.download-btn i {
  font-size: 0.9rem;
}

/* Responsive styles for operation guides */
@media (max-width: 1200px) {
  .operation-content-wrapper {
    gap: 30px;
  }
  
  .guide-card {
    padding: 25px 15px;
  }
}

@media (max-width: 992px) {
  .operation-content-wrapper {
    gap: 25px;
  }
  
  .guide-card {
    max-width: 320px;
  }
}

@media (max-width: 768px) {
  .operation-guides {
    padding: 60px 0;
  }

  .operation-content-wrapper {
    flex-direction: column;
    gap: 40px;
    align-items: center;
  }

  .buy-button-section {
    flex: none;
    width: 100%;
    padding-top: 0;
  }

  .guides-section {
    width: 100%;
  }

  .operation-guides h2 {
    font-size: 2rem;
    margin-bottom: 40px;
  }

  .guides-container {
    gap: 20px;
  }
}

@media (max-width: 576px) {
  .operation-content-wrapper {
    gap: 30px;
  }

  .guide-card {
    max-width: 300px;
  }

  .operation-guides h2 {
    font-size: 1.8rem;
  }
}

/* Research Articles Section */
.research-articles {
  padding: 80px 0;
  background-color: #fff;
}

.research-articles .container {
  max-width: 1200px;
  margin: 0 auto;
}

.research-articles h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #333;
  margin-bottom: 20px;
}

.research-articles p {
  font-size: 1.1rem;
  line-height: 1.6;
  color: #666;
  margin-bottom: 30px;
}

.research-article-link {
  color: #2e82ff;
  text-decoration: none;
  cursor: pointer;
}

.research-article-highlight {
  display: flex;
  margin-top: 40px;
  gap: 30px;
  align-items: flex-start;
}

.article-journal-cover {
  flex: 0 0 40%;
  max-width: 500px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  border-radius: 5px;
  overflow: hidden;
}

.article-journal-cover img {
  width: 100%;
  height: auto;
  display: block;
}

.article-findings {
  flex: 1;
  margin-top: 40px;
}

.article-intro {
  font-size: 1.3rem;
  font-weight: 500;
  color: #2e82ff;
  margin-bottom: 30px;
  line-height: 1.4;
}

.finding-item {
  position: relative;
  padding: 15px 0 15px 25px;
  margin-bottom: 50px;
  font-size: 1.15rem;
  line-height: 1.6;
  color: #555;
}


.finding-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: 4px;
}

.finding-highlight {
  font-size: 1.8rem;
  font-weight: 700;
  color: #333;
}

.article-citation {
  font-style: italic;
  margin-top: 30px;
  color: #666;
  font-size: 1rem;
}

/* Responsive styles for research articles */
@media (max-width: 992px) {
  .research-article-highlight {
    flex-direction: column;
  }

  .article-journal-cover {
    flex: 0 0 100%;
    max-width: 100%;
    margin-bottom: 30px;
  }
}

@media (max-width: 768px) {
  .research-articles h2 {
    font-size: 2rem;
  }

  .finding-item {
    font-size: 1rem;
  }

  .finding-highlight {
    font-size: 1.5rem;
  }

  .article-intro {
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  .research-articles h2 {
    font-size: 1.8rem;
  }

  .research-articles p {
    font-size: 1rem;
  }

  .finding-highlight {
    font-size: 1.3rem;
  }
}

.modal-content {
  position: relative;
  width: 90%;
  max-width: 900px;
  background-color: #000;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
}

.close-modal {
  position: absolute;
  top: -40px;
  right: 0;
  color: #fff;
  font-size: 30px;
  font-weight: bold;
  cursor: pointer;
  transition: color 0.3s ease;
}

.close-modal:hover {
  color: #2e82ff;
}

.modal-video-container {
  position: relative;
  width: 100%;
  padding-top: 56.25%;
  /* 16:9 比例 */
  overflow: hidden;
  border-radius: 10px;
}

#videoPlayer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* 播放按钮悬停效果增强 */
.play-button {
  cursor: pointer;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.play-button:hover {
  transform: translate(-50%, -50%) scale(1.1);
}

/* 响应式调整 */
@media (max-width: 768px) {
  .modal-content {
    width: 95%;
  }

  .close-modal {
    top: -35px;
    font-size: 26px;
  }
}

@media (max-width: 480px) {
  .modal-content {
    width: 100%;
  }

  .close-modal {
    top: -30px;
    font-size: 24px;
  }
}