html {
  font-size: 14px;
  position: relative;
  min-height: 100%;
  scroll-behavior: smooth;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

body {
  margin-bottom: 60px;
  overflow-x: hidden;
}

/* Custom styles */
.footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  background-color: #f8f9fa;
  border-top: 1px solid #dee2e6;
  font-size: 0.9rem;
  padding: 15px 0;
}

.footer .container {
  padding: 0 15px;
}

.footer .row {
  margin: 0;
  display: flex;
  align-items: center;
}

.footer .row > div {
  padding: 0;
}

@media (max-width: 767px) {
  body {
    margin-bottom: 120px;
  }

  .footer {
    padding: 10px 0;
  }

  .footer .row {
    flex-direction: column;
    gap: 5px;
  }

  .footer .row > div {
    width: 100%;
    text-align: center !important;
    line-height: 1.8;
  }

  .footer .row > div:first-child {
    margin-bottom: 5px;
  }
}

.display-4 {
  color: #333;
  margin-bottom: 2rem;
  font-size: 2.5rem;
}

@media (max-width: 768px) {
  .display-4 {
    font-size: 2rem;
  }
}

.fas {
  margin-right: 10px;
  color: #007bff;
}

.contact-info {
  font-size: 1.1rem;
  line-height: 2;
}

.card {
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  border: none;
  border-radius: 10px;
}

.card-body {
  padding: 2rem;
}

/* Navbar styles */
.navbar {
  padding: 1rem 0;
  background-color: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(10px);
}

.navbar-brand {
  font-weight: bold;
  color: #333 !important;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
}

.navbar-brand span {
  display: flex;
  align-items: baseline;
}

.navbar-brand small {
  font-size: 1rem;
  color: #666;
  font-weight: normal;
}

.nav-link {
  font-weight: 500;
  padding: 0.5rem 1rem !important;
}

/* Logo styles */
.logo-img {
  height: 40px;
  width: auto;
}

@media (max-width: 576px) {
  .logo-img {
    height: 32px;
  }
  .navbar-brand {
    font-size: 1.2rem;
  }
  .navbar-brand small {
    font-size: 0.9rem;
  }
}

/* Carousel styles */
#mainCarousel {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

#mainCarousel .carousel-item {
  width: 100%;
  height: 100%;
}

#mainCarousel .carousel-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

#mainCarousel .carousel-indicators {
  margin-bottom: 1.5rem;
  z-index: 2;
}

#mainCarousel .carousel-indicators button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin: 0 6px;
  background-color: rgba(255, 255, 255, 0.8);
  border: 2px solid rgba(0, 0, 0, 0.2);
}

#mainCarousel .carousel-indicators button.active {
  background-color: #007bff;
  border-color: #fff;
}

#mainCarousel .carousel-control-prev,
#mainCarousel .carousel-control-next {
  width: 8%;
  opacity: 0;
  transition: opacity 0.3s ease;
}

#mainCarousel:hover .carousel-control-prev,
#mainCarousel:hover .carousel-control-next {
  opacity: 0.8;
}

#mainCarousel .carousel-control-prev-icon,
#mainCarousel .carousel-control-next-icon {
  width: 3rem;
  height: 3rem;
  background-color: rgba(0, 0, 0, 0.3);
  border-radius: 50%;
  background-size: 50%;
}

/* 响应式调整 */
@media (max-width: 768px) {
  #mainCarousel {
    aspect-ratio: 16 / 10;
    margin-bottom: 1.5rem;
  }

  #mainCarousel .carousel-control-prev-icon,
  #mainCarousel .carousel-control-next-icon {
    width: 2rem;
    height: 2rem;
  }

  #mainCarousel .carousel-indicators button {
    width: 8px;
    height: 8px;
    margin: 0 4px;
  }
}

/* 在较小的移动设备上进一步调整 */
@media (max-width: 576px) {
  #mainCarousel {
    aspect-ratio: 16 / 12;
    margin-bottom: 1rem;
  }
}

/* Course card styles */
.course-card {
  background: #fff;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
  padding: 15px;
  margin-bottom: 20px;
  height: 100%;
}

.course-card:hover {
  transform: translateY(-5px);
}

.course-card img {
  border-radius: 10px;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.course-card h3 {
  font-size: 1.2rem;
  color: #333;
  margin-top: 1rem;
}

@media (max-width: 576px) {
  .course-card {
    padding: 10px;
  }
  .course-card h3 {
    font-size: 1rem;
  }
}

/* Coach intro styles */
.coach-intro {
  margin: 2rem 0;
}

.coach-intro img {
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

/* Competition photo styles */
.competition-photo {
  position: relative;
  overflow: hidden;
  border-radius: 15px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  margin-bottom: 20px;
  aspect-ratio: 1 / 1.4;
}

.competition-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.3s ease;
}

.competition-photo:hover img {
  transform: scale(1.05);
}

@media (min-width: 768px) and (max-width: 991px) {
  .competition-photo {
    max-height: 400px;
  }
}

/*@media (max-width: 767px) {
  .competition-photo {
    max-height: 300px;
  }
}*/

/* Section titles */
.container h2 {
  color: #333;
  font-weight: bold;
  position: relative;
  padding-bottom: 10px;
  margin: 3rem 0 2rem;
  text-align: center;
}

.container h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: #007bff;
}

@media (max-width: 576px) {
  .container h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1.5rem;
  }
  .container h2::after {
    width: 40px;
  }
}

/* Container spacing */
.container {
  padding: 0 15px;
  max-width: 1200px;
  margin: 0 auto;
}

@media (max-width: 576px) {
  .container {
    padding: 0 10px;
  }
}

/* Grid system adjustments */
.row {
  margin-right: -10px;
  margin-left: -10px;
}

.col-md-4, .col-md-6 {
  padding-right: 10px;
  padding-left: 10px;
}

/* Video card styles */
.video-card {
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    overflow: hidden;
    margin-bottom: 20px;
    transition: transform 0.3s ease;
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
    -khtml-user-select: none; /* Konqueror HTML */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer/Edge */
    user-select: none; /* Non-prefixed version */
}

.video-card:hover {
    transform: translateY(-5px);
}

.video-card video {
    width: 100%;
    border-radius: 10px;
    background-color: #000;
    pointer-events: auto;
    -webkit-tap-highlight-color: transparent;
}

/* 禁用视频下载按钮 */
video::-internal-media-controls-download-button {
    display: none;
}

video::-webkit-media-controls-enclosure {
    overflow: hidden;
}

video::-webkit-media-controls-panel {
    width: calc(100% + 30px);
    padding: 5px;
}

/* 移动端优化 */
@media (max-width: 768px) {
    .video-card {
        margin-bottom: 15px;
    }
    
    .video-card video {
        border-radius: 8px;
    }
}