/* 
 * 大成蒙学网站样式
 */

:root {
  /* 主题颜色 */
  --primary-color: #f1bd03;
  --dark-color: #0a1622;
  --light-dark-color: #727272;
  --light-color: #fff;
  --grey-color: #908F8D;
  --light-grey-color: #f5f5f5;
  
  /* 字体 */
  --body-font: 'Noto Sans SC', sans-serif;
  --heading-font: 'Noto Sans SC', sans-serif;
}

body {
  font-family: var(--body-font);
  color: var(--dark-color);
  line-height: 1.5;
}

/* 导航栏样式 */
.navbar {
  background-color: var(--light-color);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  padding: 15px 0;
}

.navbar-scrolled {
  padding: 8px 0;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.navbar-brand img {
  max-height: 50px;
  transition: max-height 0.3s ease;
}

.navbar-scrolled .navbar-brand img {
  max-height: 40px;
}

.navbar-nav .nav-link {
  color: var(--dark-color);
  font-weight: 500;
  transition: color 0.3s ease;
  padding: 0.5rem 1rem;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--primary-color);
}

/* 登录按钮样式 */
.btn-login {
  background-color: var(--primary-color);
  color: var(--dark-color);
  font-weight: 600;
  border: none;
  padding: 0.5rem 1.5rem;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.btn-login:hover {
  background-color: var(--dark-color);
  color: var(--light-color);
}

/* 轮播图样式 */
.banner-carousel {
  margin-top: 76px;
}

.banner-carousel .carousel-item {
  height: 500px;
  background-size: cover;
  background-position: center;
}

.banner-carousel .carousel-caption {
  background-color: rgba(0,0,0,0.5);
  padding: 20px;
  border-radius: 5px;
}

/* 卡片样式 */
.card {
  border: none;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

/* 返回顶部按钮 */
#backToTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  background-color: var(--primary-color);
  color: var(--dark-color);
  border-radius: 50%;
  display: none;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  z-index: 99;
  transition: background-color 0.3s ease;
}

#backToTop:hover {
  background-color: var(--dark-color);
  color: var(--light-color);
}

/* 动画效果 */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* 页脚样式 */
footer {
  background-color: var(--dark-color);
  color: var(--light-color);
  padding: 3rem 0 1rem;
}

footer h5 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

footer a {
  color: var(--light-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

footer a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1rem;
  margin-top: 2rem;
  font-size: 0.9rem;
}

/* 响应式调整 */
@media (max-width: 992px) {
  .banner-carousel .carousel-item {
    height: 400px;
  }
  
  .navbar-collapse {
    background-color: var(--light-color);
    padding: 1rem;
    border-radius: 0 0 0.5rem 0.5rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    z-index: 9999;
    
  }
}

@media (max-width: 768px) {
  .banner-carousel .carousel-item {
    height: 300px;
  }
  
  .navbar-brand img {
    max-height: 40px;
  }
  
  footer {
    padding: 2rem 0 1rem;
  }
}

@media (max-width: 576px) {
  .banner-carousel .carousel-item {
    height: 200px;
  }
  
  .banner-carousel .carousel-caption {
    padding: 10px;
  }
  
  .navbar-brand img {
    max-height: 35px;
  }
}

/* 通用loading样式 */
/* 基础loading样式 - 可以用于任何位置 */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.85);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  transition: all 0.3s ease-in-out;
}

/* 全屏loading - 用于覆盖整个页面 */
.loading-overlay.fullscreen {
  position: fixed;
  z-index: 9999;
}

/* loading内容容器 */
.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* spinner样式 */
.loading-spinner {
  width: 3.5rem;
  height: 3.5rem;
  border: 0.3rem solid;
  border-color: var(--primary-color);
  border-right-color: transparent;
  border-radius: 50%;
  animation: spinner-rotate 1s linear infinite;
  box-shadow: 0 0 15px rgba(241, 189, 3, 0.3);
}

/* 小尺寸spinner - 用于较小区域 */
.loading-spinner.small {
  width: 2rem;
  height: 2rem;
  border-width: 0.2rem;
}

/* loading文本样式 */
.loading-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--dark-color);
  margin-top: 1rem;
  letter-spacing: 0.02em;
  font-family: var(--body-font);
}

/* spinner旋转动画 */
@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}

/* 验证码图片样式 */
#captchaImage {
  height: 40px;
  min-width: 120px;
  background-color: var(--light-grey-color);
  border-radius: 4px;
  transition: opacity 0.3s;
}

#captchaImage.loading {
  position: relative;
}

#captchaImage.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin-top: -10px;
  margin-left: -10px;
  border: 2px solid var(--primary-color);
  border-right-color: transparent;
  border-radius: 50%;
  animation: spinner-rotate 0.8s linear infinite;
}