/* 全局样式 */
:root {
  --primary-color: #8C1515; /* 西安交大红 */
  --secondary-color: #003366; /* 兰溪一中蓝 */
  --accent-color: #FFB81C; /* 金色点缀 */
  --light-bg: #f8f9fa;
  --dark-bg: #343a40;
  --text-color: #333;
  --light-text: #fff;
  --border-radius: 8px;
  --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-bg);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: var(--transition);
}

a:hover {
  color: var(--secondary-color);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
  position: relative;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 15px;
}

.section-title p {
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto;
  color: #666;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--accent-color);
  margin: 15px auto 0;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  background-color: var(--primary-color);
  color: var(--light-text);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  text-align: center;
}

.btn:hover {
  background-color: var(--secondary-color);
  color: var(--light-text);
  transform: translateY(-3px);
  box-shadow: var(--box-shadow);
}

.btn-secondary {
  background-color: var(--secondary-color);
}

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

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: var(--light-text);
}

/* 头部导航 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.header.scrolled {
  padding: 10px 0;
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
}

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

.logo img {
  height: 50px;
  margin-right: 10px;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 30px;
  position: relative;
}

.nav-links a {
  color: var(--text-color);
  font-weight: 600;
  font-size: 1.05rem;
  padding: 10px 0;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 220px;
  background-color: #fff;
  box-shadow: var(--box-shadow);
  border-radius: var(--border-radius);
  padding: 10px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 100;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li {
  margin: 0;
}

.dropdown-menu a {
  display: block;
  padding: 10px 20px;
  color: var(--text-color);
  font-weight: 500;
  font-size: 0.95rem;
}

.dropdown-menu a:hover {
  background-color: rgba(140, 21, 21, 0.1);
  color: var(--primary-color);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--primary-color);
  cursor: pointer;
}

/* 英雄区 */
.hero {
  height: 100vh;
  min-height: 600px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--light-text);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.7));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 15px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.5rem;
  margin-bottom: 30px;
  font-weight: 400;
}

.hero-btns {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 30px;
}

/* 关于部分 */
.about {
  background-color: #fff;
}

.about-content {
  display: flex;
  align-items: center;
  gap: 50px;
}

.about-text {
  flex: 1;
}

.about-text h3 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.about-text p {
  margin-bottom: 15px;
  font-size: 1.05rem;
}

.about-image {
  flex: 1;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
}

.about-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

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

/* 历史沿革时间轴 */
.timeline {
  position: relative;
  max-width: 1200px;
  margin: 50px auto;
}

.timeline::after {
  content: '';
  position: absolute;
  width: 6px;
  background-color: var(--primary-color);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -3px;
}

.timeline-item {
  padding: 10px 40px;
  position: relative;
  width: 50%;
  box-sizing: border-box;
}

.timeline-item::after {
  content: '';
  position: absolute;
  width: 25px;
  height: 25px;
  right: -12px;
  background-color: #fff;
  border: 4px solid var(--accent-color);
  top: 15px;
  border-radius: 50%;
  z-index: 1;
}

.timeline-item.left {
  left: 0;
}

.timeline-item.right {
  left: 50%;
}

.timeline-item.left::after {
  right: -12px;
}

.timeline-item.right::after {
  left: -12px;
}

.timeline-content {
  padding: 20px;
  background-color: #fff;
  position: relative;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.timeline-content h3 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.timeline-content p {
  margin-bottom: 0;
}

.timeline-date {
  font-weight: bold;
  color: var(--secondary-color);
  margin-bottom: 5px;
}

/* 科研成就 */
.achievements {
  background-color: var(--light-bg);
}

.achievement-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.achievement-card {
  background-color: #fff;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.achievement-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.achievement-icon {
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-color);
  color: var(--light-text);
  font-size: 2.5rem;
}

.achievement-content {
  padding: 25px;
}

.achievement-content h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: var(--primary-color);
}

.achievement-content p {
  margin-bottom: 15px;
}

.achievement-stats {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 5px;
}

.stat-label {
  font-size: 0.9rem;
  color: #666;
}

/* 校友展示 */
.alumni {
  background-color: #fff;
}

.alumni-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 30px;
}

.alumni-card {
  background-color: #fff;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.alumni-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.alumni-image {
  height: 250px;
  overflow: hidden;
}

.alumni-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.alumni-card:hover .alumni-image img {
  transform: scale(1.1);
}

.alumni-content {
  padding: 20px;
}

.alumni-content h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.alumni-content p {
  margin-bottom: 15px;
  font-size: 0.95rem;
}

.alumni-content .btn {
  width: 100%;
  padding: 10px;
}

/* 排名与实力 */
.rankings {
  background-color: var(--light-bg);
}

.ranking-tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 12px 25px;
  background-color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
  margin: 5px;
  border-radius: var(--border-radius);
}

.tab-btn.active {
  background-color: var(--primary-color);
  color: var(--light-text);
}

.tab-content {
  display: none;
  animation: fadeIn 0.5s ease;
}

.tab-content.active {
  display: block;
}

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

.ranking-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 30px;
  background-color: #fff;
  box-shadow: var(--box-shadow);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.ranking-table th,
.ranking-table td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid #eee;
}

.ranking-table th {
  background-color: var(--primary-color);
  color: var(--light-text);
  font-weight: 600;
}

.ranking-table tr:last-child td {
  border-bottom: none;
}

.ranking-table tr:hover {
  background-color: rgba(140, 21, 21, 0.05);
}

/* 招生信息 */
.admission {
  background-color: #fff;
}

.admission-content {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
}

.admission-info {
  flex: 1;
  min-width: 300px;
}

.admission-info h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.admission-info p {
  margin-bottom: 15px;
}

.admission-stats {
  flex: 1;
  min-width: 300px;
}

.stat-card {
  background-color: #fff;
  border-radius: var(--border-radius);
  padding: 25px;
  margin-bottom: 20px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.stat-card h4 {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: var(--primary-color);
}

.stat-card .number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--secondary-color);
  margin-bottom: 10px;
}

.score-table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  background-color: #fff;
  box-shadow: var(--box-shadow);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.score-table th,
.score-table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #eee;
}

.score-table th {
  background-color: var(--primary-color);
  color: var(--light-text);
  font-weight: 600;
}

.score-table tr:last-child td {
  border-bottom: none;
}

.score-table tr:hover {
  background-color: rgba(140, 21, 21, 0.05);
}

/* 兰溪一中专区 */
.lanxi {
  background-color: var(--light-bg);
}

.lanxi-content {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}

.lanxi-info {
  flex: 1;
  min-width: 300px;
}

.lanxi-info h3 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--secondary-color);
}

.lanxi-info p {
  margin-bottom: 15px;
}

.lanxi-image {
  flex: 1;
  min-width: 300px;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
}

.lanxi-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

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

.lanxi-spirit {
  margin-top: 50px;
}

.spirit-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.spirit-card {
  background-color: #fff;
  border-radius: var(--border-radius);
  padding: 30px;
  text-align: center;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.spirit-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.spirit-icon {
  font-size: 3rem;
  color: var(--secondary-color);
  margin-bottom: 20px;
}

.spirit-card h4 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--secondary-color);
}

.spirit-card p {
  font-size: 1rem;
}

/* 校友风采 */
.alumni-profiles {
  background-color: #fff;
  padding: 80px 0;
}

.profile-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.profile-card {
  background-color: #fff;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.profile-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.profile-image {
  height: 200px;
  overflow: hidden;
}

.profile-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.profile-card:hover .profile-image img {
  transform: scale(1.1);
}

.profile-content {
  padding: 20px;
}

.profile-content h3 {
  font-size: 1.3rem;
  margin-bottom: 5px;
  color: var(--secondary-color);
}

.profile-content .position {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 15px;
}

.profile-content p {
  margin-bottom: 15px;
  font-size: 0.95rem;
}

.profile-content .quote {
  font-style: italic;
  color: #666;
  border-left: 3px solid var(--secondary-color);
  padding-left: 15px;
  margin-top: 15px;
}

/* 高考建议与祝福 */
.advice {
  background-color: var(--light-bg);
  position: relative;
}

.advice::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../images/advice-bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.1;
  z-index: 0;
}

.advice-content {
  position: relative;
  z-index: 1;
}

.advice-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

.advice-card {
  background-color: #fff;
  border-radius: var(--border-radius);
  padding: 30px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.advice-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.advice-icon {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 20px;
}

.advice-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--primary-color);
}

.advice-card p {
  margin-bottom: 15px;
}

.blessing {
  margin-top: 80px;
  text-align: center;
  padding: 50px;
  background-color: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
}

.blessing h3 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--primary-color);
}

.blessing p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 30px;
}

.blessing .signature {
  font-style: italic;
  font-size: 1.1rem;
  color: #666;
}

/* 联系我们 */
.contact {
  background-color: #fff;
}

.contact-content {
  display: flex;
  flex-wrap: wrap;
  gap: 50px;
}

.contact-info {
  flex: 1;
  min-width: 300px;
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: 30px;
  color: var(--primary-color);
}

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

.contact-icon {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-right: 15px;
  margin-top: 5px;
}

.contact-details h4 {
  font-size: 1.2rem;
  margin-bottom: 5px;
  color: var(--text-color);
}

.contact-details p {
  color: #666;
}

.contact-form {
  flex: 1;
  min-width: 300px;
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(140, 21, 21, 0.1);
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* 图片画廊 */
.gallery {
  background-color: var(--light-bg);
}

.gallery-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.gallery-item {
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  cursor: pointer;
  position: relative;
}

.gallery-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 15px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
  color: #fff;
  opacity: 0;
  transition: var(--transition);
}

.gallery-item:hover .gallery-caption {
  opacity: 1;
}

/* 页脚 */
.footer {
  background-color: var(--dark-bg);
  color: #fff;
  padding: 80px 0 30px;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  gap: 50px;
  margin-bottom: 50px;
}

.footer-column {
  flex: 1;
  min-width: 200px;
}

.footer-column h3 {
  font-size: 1.3rem;
  margin-bottom: 25px;
  color: var(--accent-color);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: #ccc;
  transition: var(--transition);
}

.footer-links a:hover {
  color: #fff;
  padding-left: 5px;
}

.footer-social {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: #fff;
  transition: var(--transition);
}

.social-icon:hover {
  background-color: var(--primary-color);
  transform: translateY(-5px);
}

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

.footer-bottom p {
  color: #999;
  font-size: 0.9rem;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

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

.back-to-top:hover {
  background-color: var(--secondary-color);
  transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 992px) {
  .section {
    padding: 60px 0;
  }
  
  .section-title h2 {
    font-size: 2.2rem;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .about-content {
    flex-direction: column;
  }
  
  .timeline::after {
    left: 31px;
  }
  
  .timeline-item {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
  }
  
  .timeline-item.right {
    left: 0;
  }
  
  .timeline-item.left::after,
  .timeline-item.right::after {
    left: 18px;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 15px 0;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #fff;
    flex-direction: column;
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
    padding: 20px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
  }
  
  .nav-links.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .nav-links li {
    margin: 0;
  }
  
  .nav-links a {
    display: block;
    padding: 12px 25px;
  }
  
  .dropdown-menu {
    position: static;
    width: 100%;
    box-shadow: none;
    opacity: 0;
    visibility: hidden;
    height: 0;
    padding: 0;
    overflow: hidden;
    transform: none;
  }
  
  .dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    height: auto;
    padding: 10px 0;
  }
  
  .dropdown-menu a {
    padding-left: 40px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .hero-btns {
    flex-direction: column;
    gap: 15px;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
  
  .contact-content {
    flex-direction: column;
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .section-title h2 {
    font-size: 1.8rem;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 0.95rem;
  }
  
  .timeline-content h3 {
    font-size: 1.3rem;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 40px;
  }
  
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}