/* 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #4CAF50;
  --primary-dark: #388E3C;
  --primary-light: #C8E6C9;
  --secondary-color: #2196F3;
  --text-color: #333;
  --text-light: #666;
  --bg-color: #ffffff;
  --bg-light: #f8f9fa;
  --shadow: 0 2px 20px rgba(0,0,0,0.1);
  --radius: 10px;
  --transition: all 0.3s ease;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
  transition: var(--transition);
}

/* 导航栏样式 */
nav {
  background-color: var(--bg-color);
  box-shadow: var(--shadow);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  padding: 0 5%;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-info {
  display: flex;
  align-items: center;
  gap: 15px;
}

.nav-info img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary-light);
}

.nav-info h1 {
  font-size: 1.5rem;
  color: var(--text-color);
  font-weight: 700;
}

.tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  margin-left: 10px;
  vertical-align: middle;
}

/* 导航链接 */
.nav-links {
  display: flex;
  gap: 10px;
  list-style: none;
}

.nav-link {
  padding: 10px 20px;
  border-radius: 20px;
  transition: var(--transition);
}

.nav-link a {
  color: var(--text-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.nav-link:hover, .nav-link.active {
  background-color: var(--primary-light);
}

.nav-link:hover a, .nav-link.active a {
  color: var(--primary-dark);
}

.theme-toggle {
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* 英雄区域 */
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 150px 5% 100px;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 100vh;
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

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

.highlight {
  color: var(--primary-color);
  position: relative;
}

.highlight::after {
  content: '';
  position: absolute;
  bottom: 5px;
  left: 0;
  width: 100%;
  height: 8px;
  background-color: var(--primary-light);
  z-index: -1;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: 40px;
  max-width: 500px;
}

.hero-btns {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
}

.btn {
  padding: 12px 30px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

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

.btn-secondary:hover {
  background-color: var(--primary-light);
  transform: translateY(-2px);
}

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

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

.btn-small {
  padding: 8px 20px;
  font-size: 0.9rem;
}

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

.social-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-color);
  text-decoration: none;
  transition: var(--transition);
}

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

.hero-image {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.hero-image img {
  max-width: 500px;
  width: 100%;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* 分区样式 */
.section {
  padding: 100px 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.bg-light {
  background-color: var(--bg-light);
  border-radius: var(--radius);
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 60px;
  position: relative;
  color: var(--text-color);
}

.section-title i {
  margin-right: 10px;
  color: var(--primary-color);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background-color: var(--primary-color);
  border-radius: 2px;
}

/* 关于我 */
.about-content {
  display: flex;
  gap: 60px;
  align-items: flex-start;
}

.about-image {
  flex: 1;
}

.about-image img {
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about-text {
  flex: 2;
}

.about-text h3 {
  font-size: 2rem;
  margin-bottom: 20px;
}

.student-badge {
  background-color: var(--primary-light);
  color: var(--primary-dark);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
  margin-left: 10px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 30px 0;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 15px;
  background-color: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.info-item i {
  color: var(--primary-color);
  font-size: 1.2rem;
}

.bio {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-light);
  margin: 30px 0;
}

/* 技能 */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  margin-top: 30px;
}

.skill-category {
  background-color: white;
  padding: 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.skill-category h3 {
  font-size: 1.5rem;
  margin-bottom: 25px;
  color: var(--text-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-category h3 i {
  color: var(--primary-color);
}

.skill-item {
  margin-bottom: 25px;
}

.skill-item span {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.skill-bar {
  height: 10px;
  background-color: var(--bg-light);
  border-radius: 5px;
  overflow: hidden;
}

.skill-level {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 5px;
  transition: width 1s ease-in-out;
}

/* 项目 */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.project-card {
  background-color: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.project-image {
  position: relative;
  height: 250px;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 600;
}

.project-info {
  padding: 25px;
}

.project-info h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--text-color);
}

.project-info p {
  color: var(--text-light);
  margin-bottom: 20px;
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.project-tags span {
  background-color: var(--primary-light);
  color: var(--primary-dark);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
}

/* 联系我 */
.contact-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 60px;
  margin-top: 30px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.contact-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background-color: white;
  padding: 25px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

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

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

.contact-item p {
  color: var(--text-light);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-form input,
.contact-form textarea {
  padding: 15px;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 1rem;
  transition: var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* 底部 */
footer {
  background-color: var(--text-color);
  color: white;
  padding: 60px 5% 30px;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-bottom: 20px;
}

.footer-logo img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.footer-logo span {
  font-size: 1.5rem;
  font-weight: 700;
}

.footer-quote {
  font-style: italic;
  color: #aaa;
  margin-top: 10px;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  z-index: 1000;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding: 120px 5% 80px;
  }
  
  .hero-content {
    margin-bottom: 60px;
  }
  
  .welcome-text {
    font-size: 2.8rem;
  }
  
  .about-content {
    flex-direction: column;
  }
  
  .info-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    flex-direction: column;
    background-color: var(--bg-color);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    z-index: 999;
  }
  
  .nav-links.active {
    left: 0;
  }
  
  .nav-link {
    width: 100%;
    justify-content: center;
  }
  
  .welcome-text {
    font-size: 2.2rem;
  }
  
  .hero-btns {
    flex-direction: column;
    align-items: center;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
}