/* 基础样式和CSS变量 */
:root {
  /* 浅色主题变量 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --accent-color: #007bff;
  --card-bg: #ffffff;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --card-hover-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  --border-color: #dee2e6;
  --modal-bg: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] {
  /* 深色主题变量 */
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent-color: #4dabf7;
  --card-bg: #1e1e1e;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --card-hover-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
  --border-color: #404040;
  --modal-bg: rgba(30, 30, 30, 0.98);
}

/* 基础重置和字体 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 吸顶导航栏样式 */
.sticky-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateY(0);
}

.sticky-nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border-bottom-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .sticky-nav {
  background: rgba(30, 30, 30, 0.1);
  border-bottom-color: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .sticky-nav.scrolled {
  background: rgba(30, 30, 30, 0.95);
  border-bottom-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  /* padding: 1rem 2rem; */
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-color), #6f42c1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
}

.brand-text h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.brand-text p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  opacity: 0.8;
}

.nav-actions {
  display: flex;
  gap: 0.5rem;
}

.nav-action-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}

.nav-action-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-1px);
}

[data-theme="dark"] .nav-action-btn {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .nav-action-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* 主标题区域样式 */
.hero-section {
  text-align: center;
  padding: 8rem 0 3rem;
  position: relative;
}

/* 调整容器padding */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 4rem;
}

.main-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent-color), #6f42c1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.theme-toggle {
  position: absolute;
  top: 2rem;
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 25px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-hover-shadow);
}

/* 筛选导航 */
.filter-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3rem;
  padding: 0 1rem;
}

.filter-btn {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-primary);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--accent-color);
  color: white;
  transform: translateY(-2px);
}

/* 项目网格布局 */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  padding: 0 1rem;
}

/* 卡片样式 */
.project-card {
  background: var(--card-bg);
  border-radius: 15px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: all 0.3s ease;
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--card-hover-shadow);
}

.card-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

.card-content {
  padding: 1.5rem;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  background: var(--accent-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 500;
}

.card-description {
  color: var(--text-secondary);
  line-height: 1.5;
  padding-bottom: 15px;
}

/* 技术栈样式 */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.tech-item {
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: 8px;
  font-size: 0.7rem;
  font-weight: 400;
  opacity: 0.8;
  transition: all 0.2s ease;
}

.tech-item:hover {
  opacity: 1;
  border-color: var(--accent-color);
  color: var(--accent-color);
}

/* 弹窗样式 */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(5px);
}

.modal.active {
  display: flex;
  animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    backdrop-filter: blur(0px);
  }
  to {
    opacity: 1;
    backdrop-filter: blur(5px);
  }
}

.modal-content {
  background: var(--modal-bg);
  border-radius: 20px;
  max-width: 90vw;
  max-height: 90vh;
  position: relative;
  overflow: hidden;
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    transform: scale(0.9) translateY(50px);
    opacity: 0;
  }
  to {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 10;
  transition: background 0.3s ease;
}

.modal-close:hover {
  background: rgba(0, 0, 0, 0.7);
}

.modal-image-container {
  position: relative;
  max-width: 100%;
  max-height: 70vh;
  overflow: hidden;
}

.modal-image {
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.modal-navigation {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  transform: translateY(-50%);
  padding: 0 2rem;
}

.nav-btn {
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

.nav-btn:hover {
  background: rgba(0, 0, 0, 0.7);
}

.modal-info {
  padding: 2rem;
  text-align: center;
}

.modal-info h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.modal-info p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .main-title {
    font-size: 2rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .filter-nav {
    gap: 0.5rem;
  }
  
  .filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
  
  .modal-content {
    max-width: 95vw;
    max-height: 95vh;
  }
  
  .modal-navigation {
    padding: 0 1rem;
  }
  
  .nav-btn {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 10px;
  }
  
  .header {
    padding: 2rem 0 1.5rem;
  }
  
  .main-title {
    font-size: 1.8rem;
  }
  
  .theme-toggle {
    position: relative;
    top: 0;
      color: var(--text-primary);
    margin: 1rem auto;
  }
  
  .projects-grid {
    padding: 0;
  }
  
  .card-content {
    padding: 1rem;
  }
}

/* 加载动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.project-card {
  animation: fadeIn 0.6s ease;
}

.project-card:nth-child(2) { animation-delay: 0.1s; }
.project-card:nth-child(3) { animation-delay: 0.2s; }
.project-card:nth-child(4) { animation-delay: 0.3s; }
.project-card:nth-child(5) { animation-delay: 0.4s; }
.project-card:nth-child(6) { animation-delay: 0.5s; }