/* ============================================
   设计系统 - CSS 变量
   ============================================ */
:root {
  /* 颜色系统 - 生命感蓝色系 */
  --color-bg: #F5F1E8;
  --color-bg-alt: #EDE8DB;
  --color-primary: #1B4965;
  --color-primary-light: #2D6A8F;
  --color-secondary: #5FA8D3;
  --color-accent-blue: #62B6CB;
  --color-accent-coral: #E07A5F;
  --color-accent-purple: #9B8AC4;
  --color-accent-green: #81B29A;
  --color-accent-yellow: #F2CC8F;
  --color-text-dark: #1B4965;
  --color-text-light: #F5F1E8;
  --color-text-muted: #6B8BA0;
  --color-card-bg: #2D3142;
  --color-border: rgba(27, 73, 101, 0.15);

  /* 字体系统 */
  --font-display: 'ZCOOL KuaiLe', 'Ma Shan Zheng', 'STKaiti', cursive;
  --font-body: 'Noto Serif SC', 'Source Code Pro', 'Courier New', monospace;
  --font-mono: 'Source Code Pro', 'Courier New', monospace;

  /* 间距系统 */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  /* 边框圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* 边框宽度 */
  --border-thin: 2px;
  --border-medium: 4px;
  --border-thick: 6px;

  /* 过渡动画 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(27, 73, 101, 0.1);
  --shadow-md: 0 4px 16px rgba(27, 73, 101, 0.15);
  --shadow-lg: 0 8px 32px rgba(27, 73, 101, 0.2);

  /* 最大宽度 */
  --max-width: 1100px;
  --content-width: 720px;
}

/* ============================================
   基础重置
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-dark);
  background-color: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 装饰性纹理背景 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231B4965' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
  z-index: -1;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: normal;
  line-height: 1.3;
  color: var(--color-text-dark);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary);
}

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

ul, ol {
  list-style: none;
}

/* ============================================
   通用容器
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.content-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.navbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-text-dark);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.nav-link {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-dark);
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

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

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

.nav-link.active {
  color: var(--color-primary);
  font-weight: 600;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-dark);
  margin: 5px 0;
  transition: all var(--transition-base);
}

/* ============================================
   作品卡片
   ============================================ */
.work-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.work-card:hover {
  transform: translateY(-6px) rotate(-0.5deg);
  box-shadow: var(--shadow-lg);
}

.work-card-border {
  position: absolute;
  inset: 0;
  border: var(--border-medium) solid;
  border-radius: var(--radius-lg);
  pointer-events: none;
  z-index: 2;
}

.work-card-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--color-bg-alt);
}

.work-card-overlay {
  position: absolute;
  bottom: var(--space-lg);
  right: var(--space-lg);
  left: auto;
  max-width: 80%;
  background-color: var(--color-card-bg);
  color: var(--color-text-light);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  z-index: 3;
}

.work-card-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-xs);
}

.work-card-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(245, 241, 232, 0.7);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.work-card-meta::before {
  content: '→';
  color: var(--color-accent-blue);
}

/* 不同颜色的卡片边框 */
.work-card.border-blue .work-card-border {
  border-color: var(--color-secondary);
}

.work-card.border-coral .work-card-border {
  border-color: var(--color-accent-coral);
}

.work-card.border-purple .work-card-border {
  border-color: var(--color-accent-purple);
}

.work-card.border-green .work-card-border {
  border-color: var(--color-accent-green);
}

/* ============================================
   装饰符号
   ============================================ */
.deco-star {
  display: inline-block;
  color: var(--color-accent-coral);
  animation: twinkle 2s ease-in-out infinite;
}

.deco-flower {
  display: inline-block;
  color: var(--color-accent-purple);
  animation: sway 3s ease-in-out infinite;
}

.deco-sparkle {
  display: inline-block;
  color: var(--color-accent-blue);
  animation: sparkle 1.5s ease-in-out infinite;
}

@keyframes twinkle {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.8); }
}

@keyframes sway {
  0%, 100% { transform: rotate(-5deg); }
  50% { transform: rotate(5deg); }
}

@keyframes sparkle {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-body);
  font-size: 0.9rem;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  background-color: transparent;
  color: var(--color-primary);
  cursor: pointer;
  transition: all var(--transition-base);
}

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

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

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

/* ============================================
   页脚
   ============================================ */
.footer {
  margin-top: var(--space-3xl);
  padding: var(--space-2xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.footer-text {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--color-text-dark);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.footer-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-dark);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--transition-fast);
}

.footer-link::before {
  content: '→';
  color: var(--color-secondary);
}

.footer-link:hover {
  color: var(--color-secondary);
}

/* ============================================
   页面入场动画
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}

.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }
.animate-in-delay-4 { animation-delay: 0.4s; }
.animate-in-delay-5 { animation-delay: 0.5s; }

/* 滚动出现动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   辅助类
   ============================================ */
.text-center { text-align: center; }
.text-display { font-family: var(--font-display); }
.text-mono { font-family: var(--font-mono); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }