:root {
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #a5b4fc;
  --secondary-color: #10b981;
  --dark-color: #1e293b;
  --light-color: #f8fafc;
  --gray-color: #94a3b8;
  --gray-light: #e2e8f0;
  --gray-dark: #475569;
  --danger-color: #ef4444;
  --success-color: #22c55e;
  --border-radius: 12px;
  --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
  --max-width: 1200px;
}

/* 暗色模式变量 */
[data-theme="dark"] {
  --primary-color: #818cf8;
  --primary-dark: #6366f1;
  --primary-light: #c7d2fe;
  --secondary-color: #34d399;
  --dark-color: #f8fafc;
  --light-color: #0f172a;
  --gray-color: #cbd5e1;
  --gray-light: #334155;
  --gray-dark: #cbd5e1;
  --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Poppins', 'Noto Sans SC', sans-serif;
  line-height: 1.7;
  color: var(--dark-color);
  background-color: var(--light-color);
  transition: var(--transition);
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: var(--transition);
}

[data-theme="dark"] .navbar {
  background-color: rgba(15, 23, 42, 0.95);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

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

.logo span {
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  transition: var(--transition);
}

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

.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%;
}

.theme-toggle {
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--gray-dark);
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--primary-color);
}

/* 英雄区域样式 */
.hero {
  padding: 8rem 0 5rem;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,213.3C1248,235,1344,213,1392,202.7L1440,192L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  opacity: 0.6;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero h1 span {
  position: relative;
  display: inline-block;
  padding: 0 0.5rem;
}

.hero h1 span::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 40%;
  background-color: rgba(255, 255, 255, 0.3);
  z-index: -1;
  transform: skewX(-15deg);
}

.hero p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto 2rem;
  opacity: 0.9;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}

.btn i {
  margin-left: 0.5rem;
}

.btn-primary {
  background-color: white;
  color: var(--primary-color);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
  backdrop-filter: blur(5px);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

.btn-outline {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  background: transparent;
  font-weight: 500;
}

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

/* 项目部分样式 */
.projects-section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.5rem;
  color: var(--dark-color);
  margin-bottom: 0.5rem;
  position: relative;
  display: inline-block;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background-color: var(--primary-color);
}

.section-header p {
  color: var(--gray-color);
  font-size: 1.1rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2.5rem;
}

.project-card {
  background-color: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  height: 100%;
  display: flex;
  flex-direction: column;
}

[data-theme="dark"] .project-card {
  background-color: var(--gray-light);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.project-image {
  height: 200px;
  background-color: var(--primary-color);
  background-image: url('data:image/svg+xml;charset=utf8,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"%3E%3Cpath fill="%23ffffff" fill-opacity="0.2" d="M0,224L48,213.3C96,203,192,181,288,154.7C384,128,480,96,576,90.7C672,85,768,107,864,128C960,149,1056,171,1152,165.3C1248,160,1344,128,1392,112L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"%3E%3C/path%3E%3C/svg%3E');
  background-size: cover;
  background-position: center;
  position: relative;
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(0,0,0,0.1), rgba(0,0,0,0.4));
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 1rem;
}

.project-category {
  background-color: var(--primary-color);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
}

.project-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--dark-color);
}

.project-content p {
  color: var(--gray-dark);
  margin-bottom: 1.5rem;
  flex: 1;
}

.project-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  color: var(--gray-color);
  font-size: 0.9rem;
}

.project-meta i {
  margin-right: 0.3rem;
}

/* 页脚样式 */
footer {
  background-color: var(--dark-color);
  color: white;
  padding: 4rem 0 1rem;
}

[data-theme="dark"] footer {
  background-color: #0f172a;
  border-top: 1px solid var(--gray-light);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-logo p {
  margin-top: 1rem;
  color: var(--gray-color);
}

.footer-links h4,
.footer-contact h4 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  position: relative;
  display: inline-block;
}

.footer-links h4::after,
.footer-contact h4::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--primary-color);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-links a,
.footer-contact a {
  color: var(--gray-color);
  transition: var(--transition);
}

.footer-links a:hover,
.footer-contact a:hover {
  color: var(--primary-color);
}

.footer-contact p {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  color: var(--gray-color);
}

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

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

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

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

/* 响应式设计 */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .projects-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (max-width: 768px) {
  .navbar .container {
    height: 60px;
  }
  
  .hero {
    padding: 7rem 0 4rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-links h4::after,
  .footer-contact h4::after {
    left: 50%;
    transform: translateX(-50%);
  }
  
  .footer-links ul {
    align-items: center;
  }
  
  .footer-contact p {
    justify-content: center;
  }
  
  .social-icons {
    justify-content: center;
  }
}

@media (max-width: 576px) {
  .container {
    padding: 0 1rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }
  
  .btn {
    width: 100%;
  }
}

/* 在适当位置添加以下样式 */

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-switch {
  display: flex;
  border-radius: 50px;
  overflow: hidden;
  border: 1px solid var(--gray-light);
}

.lang-btn {
  background: none;
  border: none;
  padding: 0.3rem 0.7rem;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  color: var(--gray-dark);
}

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

[data-theme="dark"] .lang-btn {
  color: var(--gray-color);
}

[data-theme="dark"] .lang-btn.active {
  background-color: var(--primary-color);
  color: white;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* 在移动设备上隐藏导航链接 */
  }
  
  .nav-controls {
    margin-left: auto;
  }
}