/* ========================================
   个人技术作品展示门户网站 - 公共样式
   ======================================== */

/* ========================================
   1. CSS变量和基础样式
   ======================================== */
:root {
  /* 主题色 */
  --primary-color: #3B82F6;
  --secondary-color: #8B5CF6;
  --accent-color: #FB923C;
  --success-color: #34D399;

  /* 背景色 */
  --bg-gradient-start: #E0F2FE;
  --bg-gradient-end: #DBEAFE;

  /* 文字颜色 */
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --text-light: #9CA3AF;

  /* 卡片样式 */
  --card-bg: rgba(255, 255, 255, 0.95);
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --card-shadow-hover: 0 10px 25px rgba(0, 0, 0, 0.15);
  --card-border-radius: 16px;

  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;

  /* 过渡动画 */
  --transition-base: all 0.3s ease;
}

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 字体引入 */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800&display=swap');

body {
  font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* ========================================
   2. 背景装饰元素
   ======================================== */
body::before,
body::after {
  content: '';
  position: fixed;
  border-radius: 50%;
  opacity: 0.3;
  z-index: -1;
  animation: float 20s ease-in-out infinite;
}

body::before {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, #93C5FD 0%, transparent 70%);
  top: 10%;
  left: -5%;
}

body::after {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #C4B5FD 0%, transparent 70%);
  bottom: 10%;
  right: -5%;
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(30px, -30px);
  }
}

/* ========================================
   3. 容器和布局
   ======================================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
  min-height: calc(100vh - 120px);
}

/* ========================================
   4. 导航栏样式
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: var(--spacing-sm) var(--spacing-md);
}

.navbar-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition-base);
}

.navbar-brand:hover {
  color: var(--secondary-color);
  transform: scale(1.05);
}

.navbar-links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.navbar-links a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 8px;
  transition: var(--transition-base);
  font-weight: 600;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--primary-color);
  background: rgba(59, 130, 246, 0.1);
}

/* ========================================
   5. Hero区域（主页）
   ======================================== */
.hero {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  margin-top: var(--spacing-xl);
  position: relative;
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
  animation: fadeInDown 0.8s ease;
}

.hero p {
  font-size: 20px;
  color: var(--text-secondary);
  animation: fadeInUp 0.8s ease 0.2s both;
}

/* 云朵装饰 */
.cloud {
  position: absolute;
  background: white;
  border-radius: 50%;
  opacity: 0.6;
  animation: drift 30s linear infinite;
}

.cloud::before,
.cloud::after {
  content: '';
  position: absolute;
  background: white;
  border-radius: 50%;
}

.cloud-1 {
  width: 100px;
  height: 40px;
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.cloud-1::before {
  width: 50px;
  height: 50px;
  top: -25px;
  left: 10px;
}

.cloud-1::after {
  width: 60px;
  height: 60px;
  top: -35px;
  right: 10px;
}

.cloud-2 {
  width: 80px;
  height: 32px;
  top: 20%;
  right: 15%;
  animation-delay: -10s;
}

.cloud-2::before {
  width: 40px;
  height: 40px;
  top: -20px;
  left: 8px;
}

.cloud-2::after {
  width: 48px;
  height: 48px;
  top: -28px;
  right: 8px;
}

@keyframes drift {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(calc(100vw + 200px));
  }
}

/* ========================================
   6. 卡片样式
   ======================================== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  padding: 0 var(--spacing-sm);
}

.card {
  background: var(--card-bg);
  border-radius: var(--card-border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--card-shadow);
  transition: var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.card h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.card p {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: var(--spacing-sm);
}

.card-link {
  color: var(--primary-color);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: var(--transition-base);
}

.card-link:hover {
  color: var(--secondary-color);
  gap: var(--spacing-sm);
}

/* ========================================
   7. 页面标题区（二级页面）
   ======================================== */
.page-header {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  margin-top: 80px;
}

.page-header h1 {
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
}

.page-header p {
  font-size: 18px;
  color: var(--text-secondary);
}

/* ========================================
   8. 功能标签区
   ======================================== */
.features {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
  padding: 0 var(--spacing-md);
}

.tag {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
  transition: var(--transition-base);
}

.tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

/* ========================================
   9. 导航链接区
   ======================================== */
.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
  padding: 0 var(--spacing-md);
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: white;
  color: var(--primary-color);
  text-decoration: none;
  border-radius: 12px;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: var(--transition-base);
  border: 2px solid var(--primary-color);
}

.btn:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* ========================================
   10. 图文展示区
   ======================================== */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
  padding: 0 var(--spacing-sm);
}

.gallery-card {
  background: var(--card-bg);
  border-radius: var(--card-border-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition-base);
}

.gallery-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-shadow-hover);
}

.gallery-icon {
  width: 100%;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 80px;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
}

.gallery-content {
  padding: var(--spacing-md);
}

.gallery-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.gallery-content p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.6;
}

/* ========================================
   11. 免责声明
   ======================================== */
.disclaimer {
  background: #FEF2F2;
  border: 2px solid #FCA5A5;
  border-radius: 12px;
  padding: var(--spacing-md);
  margin: var(--spacing-lg) var(--spacing-md);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.disclaimer-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.disclaimer-content {
  flex: 1;
}

.disclaimer-content h4 {
  color: #DC2626;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.disclaimer-content p {
  color: #7F1D1D;
  font-size: 14px;
  line-height: 1.6;
}

/* ========================================
   12. 底部信息
   ======================================== */
.footer {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  margin-top: var(--spacing-xl);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
}

.footer p {
  color: var(--text-secondary);
  font-size: 14px;
  margin: var(--spacing-xs) 0;
}

.footer a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition-base);
}

.footer a:hover {
  color: var(--secondary-color);
  text-decoration: underline;
}

/* ========================================
   13. 动画效果
   ======================================== */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* 页面加载动画 */
.card,
.gallery-card,
.tag,
.btn {
  animation: fadeIn 0.6s ease;
}

/* 交错动画 */
.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }

.gallery-card:nth-child(1) { animation-delay: 0.1s; }
.gallery-card:nth-child(2) { animation-delay: 0.2s; }
.gallery-card:nth-child(3) { animation-delay: 0.3s; }

/* ========================================
   14. 响应式设计
   ======================================== */
/* 移动端 */
@media (max-width: 767px) {
  .hero h1 {
    font-size: 32px;
  }

  .hero p {
    font-size: 16px;
  }

  .cards {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .page-header h1 {
    font-size: 32px;
  }

  .gallery {
    grid-template-columns: 1fr;
  }

  .navbar-links {
    gap: var(--spacing-xs);
  }

  .navbar-links a {
    font-size: 14px;
    padding: 6px 10px;
  }

  .features {
    gap: var(--spacing-xs);
  }

  .tag {
    font-size: 13px;
    padding: 6px 12px;
  }

  .links {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    text-align: center;
  }

  .cloud {
    display: none;
  }
}

/* 平板端 */
@media (min-width: 768px) and (max-width: 1023px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 桌面端 */
@media (min-width: 1024px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .gallery {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========================================
   15. 辅助类
   ======================================== */
.text-center {
  text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }