/* 现代化首页样式 - Bootstrap 5 */

:root {
  --primary: #dd1d4a;
  --primary-dark: #c11840;
  --primary-light: #ff6b9d;
  --secondary: #667eea;
  --success: #48bb78;
  --warning: #f59e0b;
  --danger: #f56565;
  --dark: #1a202c;
  --gray: #4a5568;
  --light: #f7fafc;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "微软雅黑", sans-serif;
  color: var(--dark);
  line-height: 1.7;
  overflow-x: hidden;
  padding-top: 76px;
}

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

/* 导航栏 */
.navbar {
  backdrop-filter: blur(20px);
  transition: all 0.3s;
}

.navbar-brand img {
  transition: transform 0.3s;
}

.navbar-brand:hover img {
  transform: scale(1.05);
}

.nav-link {
  font-weight: 600;
  position: relative;
  transition: all 0.3s;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: all 0.3s;
  transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

/* Hero 区域 */
.hero-modern {
  position: relative;
  overflow: hidden;
}

.hero-modern::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}

.hero-modern img {
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* 按钮样式 */
.btn {
  font-weight: 600;
  padding: 0.75rem 2rem;
  transition: all 0.3s;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border: none;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(221, 29, 74, 0.3);
}

.btn-outline-primary {
  border: 2px solid var(--primary);
  color: var(--primary);
}

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

.btn-light:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

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

/* 卡片样式 */
.card {
  border: none;
  border-radius: 20px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15) !important;
}

.card-img-top {
  transition: transform 0.4s;
}

.card:hover .card-img-top {
  transform: scale(1.1);
}

/* 徽章样式 */
.badge {
  padding: 0.5rem 1rem;
  font-weight: 600;
  border-radius: 20px;
}

/* 表单样式 */
.form-control,
.form-select {
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  padding: 0.75rem 1rem;
  transition: all 0.3s;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(221, 29, 74, 0.1);
}

.form-control-lg {
  padding: 1rem 1.25rem;
  font-size: 1.1rem;
}

/* 区块样式 */
section {
  position: relative;
}

.display-3,
.display-4,
.display-5 {
  font-weight: 800;
  letter-spacing: -1px;
}

/* 图标样式 */
.bi {
  vertical-align: middle;
}

/* 响应式 */
@media (max-width: 768px) {
  body {
    padding-top: 66px;
  }
  
  .display-3 {
    font-size: 2.5rem;
  }
  
  .display-5 {
    font-size: 2rem;
  }
  
  .lead {
    font-size: 1.1rem;
  }
  
  .btn-lg {
    padding: 0.75rem 1.5rem;
  }
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

/* 选择文本 */
::selection {
  background: rgba(221, 29, 74, 0.2);
  color: var(--dark);
}

/* 链接样式 */
a {
  text-decoration: none;
  transition: all 0.3s;
}

a:hover {
  opacity: 0.8;
}

/* 页脚 */
footer a:hover {
  color: var(--primary-light) !important;
}

/* 动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

/* 阴影工具类 */
.shadow-primary {
  box-shadow: 0 10px 30px rgba(221, 29, 74, 0.2) !important;
}

.shadow-lg {
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15) !important;
}

/* 渐变背景 */
.bg-gradient-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%) !important;
}

/* 圆角工具类 */
.rounded-4 {
  border-radius: 1.5rem !important;
}

.rounded-5 {
  border-radius: 2rem !important;
}

/* 间距优化 */
.py-6 {
  padding-top: 5rem !important;
  padding-bottom: 5rem !important;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 1000;
  box-shadow: 0 5px 20px rgba(221, 29, 74, 0.4);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(221, 29, 74, 0.5);
}