:root {
  /* Dark Theme (Default) */
  --primary-color: #ffd700;
  --secondary-color: #ffa500;
  --background-color: #ffffff;
  --surface-color: #2d2d2d;
  --text-color: #ffffff;
  --text-secondary: #cccccc;
  --border-color: #404040;
  --shadow: rgba(255, 215, 0, 0.1);
  --gradient: linear-gradient(135deg, #ffd700, #ffa500);
}

[data-theme="light"] {
  /* Light Theme */
  --primary-color: #ffd700;
  --secondary-color: #ffa500;
  --background-color: #ffffff;
  --surface-color: #f8f9fa;
  --text-color: #333333;
  --text-secondary: #666666;
  --border-color: #e0e0e0;
  --shadow: rgba(0, 0, 0, 0.1);
  --gradient: linear-gradient(135deg, #ffd700, #ffa500);
}

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

button.carousel-control-prev, .carousel-control-next {
    margin-top: 215px;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: all 0.3s ease;
}

/* Theme Toggle */
.theme-toggle-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1050;
}

.theme-toggle-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient);
  border: none;
  color: #333;
  font-size: 20px;
  box-shadow: 0 4px 15px var(--shadow);
  transition: all 0.3s ease;
}

.theme-toggle-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px var(--shadow);
}

/* Header */
.main-header {
  background: var(--surface-color);
  border-bottom: 2px solid var(--primary-color);
  box-shadow: 0 2px 10px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color) !important;
  text-decoration: none;
}

.navbar-brand i {
  margin-right: 10px;
}

.navbar-nav .nav-link {
  color: var(--text-color) !important;
  font-weight: 500;
  margin: 0 10px;
  transition: all 0.3s ease;
  position: relative;
}

.navbar-nav .nav-link:hover {
  color: var(--primary-color) !important;
  transform: translateY(-2px);
}

.navbar-nav .nav-link::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

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

.navbar-toggler {
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
}

/* Banner Section */
.banner-section {
  padding: 40px 0;
  background: var(--background-color);
}

.carousel {
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 30px var(--shadow);
}

.banner-image {
  height: 430px;
  object-fit: cover;
  filter: none !important;
  -webkit-filter: none !important;
  /* Completely removed all filters to make image clear */
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

.carousel-caption {
  background: transparent !important; /* Loại bỏ lớp mờ cũ - chỉ dùng banner-overlay */
  border-radius: 10px;
  padding: 20px;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  /* Completely removed backdrop blur */
}

.carousel-item {
  filter: none !important;
  -webkit-filter: none !important;
}

.carousel-inner {
  filter: none !important;
  -webkit-filter: none !important;
}

.banner-title {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--primary-color);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  margin-bottom: 15px;
}

.banner-description {
  font-size: 1.2rem;
  color: #ffffff;
  margin-bottom: 20px;
}

.btn-banner {
  background: var(--gradient);
  border: none;
  color: #333;
  font-weight: bold;
  padding: 12px 30px;
  border-radius: 25px;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.btn-banner:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
  color: #333;
}

.carousel-control-prev,
.carousel-control-next {
  width: 38px;
  height: 38px;
  background: rgba(255, 255, 255, 0.9);
  border: 2px solid rgba(255, 215, 0, 0.8);
  border-radius: 50%;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.85;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

.carousel-control-prev {
  left: 15px;
}

.carousel-control-next {
  right: 15px;
}

.carousel-control-prev:hover,
.carousel-control-next:hover {
  opacity: 1;
  background: rgba(255, 255, 255, 1);
  border-color: #FFD333;
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 4px 12px rgba(255, 215, 0, 0.4);
}

.carousel-control-prev-icon,
.carousel-control-next-icon {
  width: 18px;
  height: 18px;
  filter: brightness(0) saturate(100%) invert(75%) sepia(87%) saturate(1352%) hue-rotate(0deg) brightness(1.1) contrast(1.1);
  -webkit-filter: brightness(0) saturate(100%) invert(75%) sepia(87%) saturate(1352%) hue-rotate(0deg) brightness(1.1) contrast(1.1);
  opacity: 1;
}

.carousel-indicators button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 2px solid #fff;
  margin: 0 5px;
}

/* Side Offers */
.side-offer {
  position: relative;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 8px 25px var(--shadow);
  transition: all 0.3s ease;
}

.side-offer:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px var(--shadow);
}

.side-offer img {
  height: 200px;
  object-fit: cover;
  filter: brightness(0.7);
}

.offer-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: white;
  text-align: center;
  padding: 20px;
}

.offer-overlay h5 {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.offer-overlay p {
  font-size: 1rem;
  margin: 0;
}

/* Features Section */
.features-section {
  padding: 80px 0;
  background: var(--surface-color);
}

.feature-card {
  background: var(--background-color);
  padding: 40px 20px;
  border-radius: 15px;
  box-shadow: 0 8px 25px var(--shadow);
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

.feature-card:hover {
  transform: translateY(-10px);
  border-color: var(--primary-color);
  box-shadow: 0 15px 35px var(--shadow);
}

.feature-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 20px;
  transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
  transform: scale(1.2);
}

.feature-card h5 {
  color: var(--text-color);
  font-weight: bold;
  margin-bottom: 15px;
}

.feature-card p {
  color: var(--text-secondary);
  margin: 0;
}

/* Footer */
.main-footer {
  background: var(--surface-color);
  padding: 50px 0 20px;
  border-top: 2px solid var(--primary-color);
}

.main-footer h5 {
  color: var(--primary-color);
  font-weight: bold;
  margin-bottom: 20px;
}

.main-footer p {
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.main-footer i {
  color: var(--primary-color);
  margin-right: 10px;
}

.social-links a {
  display: inline-block;
  width: 40px;
  height: 40px;
  background: var(--gradient);
  color: #333;
  text-align: center;
  line-height: 40px;
  border-radius: 50%;
  margin-right: 10px;
  transition: all 0.3s ease;
  text-decoration: none;
}

.social-links a:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(255, 215, 0, 0.4);
}

.main-footer hr {
  border-color: var(--border-color);
  margin: 30px 0 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .banner-title {
    font-size: 1.8rem;
  }

  .banner-description {
    font-size: 1rem;
  }

  .theme-toggle-container {
    top: 10px;
    right: 10px;
  }

  .theme-toggle-btn {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

  .features-section {
    padding: 40px 0;
  }

  .feature-card {
    margin-bottom: 30px;
  }
}

/* Smooth transitions for theme switching */
* {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}