/* 引入思源黑体 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* 设计令牌 */
:root {
  --color-primary: #000000;
  --color-secondary: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;
  --color-beige: #f7f3e9;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --radius-sm: 0.125rem;
  --radius-md: 0.25rem;
  --radius-lg: 0.5rem;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* 全局样式 */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-beige);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 导航样式 */
.nav-link {
  position: relative;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-primary);
  transition: width 0.3s ease;
}

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

/* Hero区域样式 */
.hero-overlay {
  background: linear-gradient(to bottom, transparent 0%, rgba(0, 0, 0, 0.4) 100%);
}

/* 图片画廊样式 */
.gallery-item {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* 图片遮罩效果 */
.image-overlay {
  background: rgba(0, 0, 0, 0);
  transition: background-color 0.3s ease;
}

.gallery-item:hover .image-overlay {
  background: rgba(0, 0, 0, 0.3);
}

/* 按钮样式 */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-secondary);
  border: 1px solid var(--color-primary);
  transition: all 0.3s ease;
}

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

/* 文本样式 */
.text-display {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.text-headline {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

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

.fade-in {
  animation: fadeIn 0.8s ease-out;
}

/* 滚动提示动画 */
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

.bounce {
  animation: bounce 2s infinite;
}

/* 响应式工具类 */
.container-fluid {
  width: 100%;
  padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
  .container-fluid {
    padding: 0 var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .container-fluid {
    padding: 0 var(--spacing-xl);
  }
}

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

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-400);
  border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* 选择文本样式 */
::selection {
  background-color: var(--color-gray-800);
  color: var(--color-secondary);
}

/* 焦点样式 */
.focus-visible:focus {
  outline: 2px solid var(--color-gray-600);
  outline-offset: 2px;
}

/* 打印样式 */
@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
  }
}