/* 全局CSS变量 */
:root {
  --color-primary: #F5F7FA;
  --color-secondary: #2C3E3F;
  --color-accent: #E0AFA0;
  --color-text: #333333;
  --color-text-light: #666666;
  --transition-smooth: all 0.3s ease;
}

/* 全局重置与基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--color-primary);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 图片统一滤镜效果 */
img {
  filter: saturate(0.85) brightness(1.05);
  transition: var(--transition-smooth);
}

img:hover {
  filter: saturate(1) brightness(1.1);
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: var(--transition-smooth);
}

.nav-link {
  position: relative;
  color: var(--color-secondary);
  transition: var(--transition-smooth);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition-smooth);
}

.nav-link:hover::after {
  width: 100%;
}

/* 汉堡菜单样式 */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--color-secondary);
  margin: 3px 0;
  transition: var(--transition-smooth);
}

/* 按钮样式 */
.btn-primary {
  background: var(--color-secondary);
  color: white;
  padding: 12px 32px;
  border-radius: 8px;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 15px rgba(44, 62, 63, 0.2);
}

.btn-primary:hover {
  background: var(--color-accent);
  box-shadow: 0 6px 20px rgba(224, 175, 160, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-secondary);
  padding: 12px 32px;
  border: 2px solid var(--color-secondary);
  border-radius: 8px;
  transition: var(--transition-smooth);
}

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

/* 卡片样式 */
.card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: var(--transition-smooth);
}

.card:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  transform: translateY(-5px);
}

/* 模态框样式 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 2000;
  backdrop-filter: blur(5px);
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: white;
  border-radius: 16px;
  padding: 40px;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  animation: modalSlideIn 0.3s ease;
}

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

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  border: none;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.modal-close:hover {
  background: var(--color-accent);
  transform: rotate(90deg);
}

/* 页脚样式 */
.footer {
  text-align: center;
  padding: 40px 20px;
  color: var(--color-text-light);
  font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  
  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    display: none;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-link {
    padding: 10px 0;
  }
  
  .modal-content {
    padding: 30px 20px;
  }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-secondary);
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--color-primary);
  border-top-color: var(--color-secondary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}