/* 关于我们 */
:root {
  --primary: #4361ee;
  --primary-dark: #3a56d4;
  --secondary: #3f37c9;
  --accent: #4895ef;
  --light: #f5f7fa;
  --dark: #1a1a2e;
  --text: #333;
  --text-light: #666;
  --white: #fff;
  --success: #4cc9f0;
  --warning: #f72585;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
  background-color: var(--light);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 导航栏样式 */
nav {
  background: var(--white);
  box-shadow: var(--shadow);
  padding: 1rem 2rem;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
}

.logo i {
  margin-right: 0.5rem;
  color: var(--accent);
}

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

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

nav ul li {
  margin-left: 2rem;
}

nav ul li a {
  color: var(--dark);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 0.5rem 0;
}

nav ul li a:hover {
  color: var(--primary);
}

nav ul li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

nav ul li a:hover::after {
  width: 100%;
}

/* 头部区域 */
.about-header {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--white);
  text-align: center;
  padding: 8rem 1rem 6rem;
  margin-top: 60px;
  position: relative;
}

.about-header h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  font-weight: 700;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.about-header p {
  font-size: 1.3rem;
  opacity: 0.9;
  max-width: 800px;
  margin: 0 auto;
}

/* 主要内容 */
.about-content {
  padding: 5rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark);
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 80px;
  height: 4px;
  background: var(--accent);
  margin: 1rem auto;
  border-radius: 2px;
}

.about-section {
  margin-bottom: 4rem;
  background: var(--white);
  padding: 2rem;
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.about-section h2 {
  color: var(--primary);
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  text-align: center;
}

.about-section p {
  color: var(--text-light);
  margin-bottom: 1rem;
  line-height: 1.8;
  text-align: justify;
}

.mission-list {
  list-style: none;
  max-width: 600px;
  margin: 0 auto;
}

.mission-list li {
  margin-bottom: 1rem;
  padding-left: 2rem;
  position: relative;
  color: var(--text-light);
}

.mission-list li::before {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* 团队展示 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.team-card {
  background: var(--white);
  border-radius: 10px;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}

.team-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.team-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.5rem;
  border: 4px solid var(--accent);
}

.team-card h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.team-card p {
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.team-social {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

.team-social a {
  color: var(--primary);
  transition: var(--transition);
}

.team-social a:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

/* 联系我们 */
.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.contact-card {
  background: var(--white);
  border-radius: 10px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
}

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

.contact-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.contact-card h3 {
  color: var(--dark);
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.contact-card p {
  color: var(--text-light);
  margin-bottom: 1rem;
}

.message-board-btn {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 0.8rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  margin-top: 2rem;
}

.message-board-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* 页脚 */
footer {
  background: var(--dark);
  color: var(--white);
  padding: 4rem 1rem 2rem;
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-logo {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--white);
}

.footer-about p {
  margin-bottom: 1.5rem;
  opacity: 0.8;
}

.footer-links h3,
.footer-contact h3 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-links h3::after,
.footer-contact h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 2px;
  background: var(--accent);
}

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

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-links a {
  color: var(--white);
  opacity: 0.8;
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  opacity: 1;
  padding-left: 5px;
}

.footer-contact p {
  margin-bottom: 0.8rem;
  opacity: 0.8;
  display: flex;
  align-items: center;
}

.footer-contact i {
  margin-right: 0.5rem;
  color: var(--accent);
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

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

.social-links a:hover {
  background: var(--accent);
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0.7;
  font-size: 0.9rem;
}

.footer-bottom a {
  color: var(--white);
  text-decoration: none;
}

/* 响应式设计 */
@media (max-width: 992px) {
  .about-header h1 {
    font-size: 2.8rem;
  }

  .section-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  nav ul {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--white);
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
    transition: var(--transition);
  }

  nav ul.active {
    left: 0;
  }

  nav ul li {
    margin: 1rem 0;
  }

  .about-header {
    padding: 4rem 1rem 2rem;
  }

  .about-header h1 {
    font-size: 2.2rem;
  }

  .about-header p {
    font-size: 1.1rem;
  }
}

@media (max-width: 576px) {
  .team-grid,
  .contact-info {
    grid-template-columns: 1fr;
  }
}