body {
  margin: 0;
  font-family: 'Sarabun', sans-serif;
  background: #000;
  color: #fff;
  overflow: hidden;
}
/* Floating particles animation */
body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(2px 2px at 20px 30px, #fff, transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 90px 40px, #fff, transparent),
    radial-gradient(1px 1px at 130px 80px, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(2px 2px at 160px 30px, #fff, transparent);
  background-repeat: repeat;
  background-size: 200px 100px;
  animation: sparkle 6s linear infinite;
  pointer-events: none;
  opacity: 0.6;
  z-index: 1;
}
@keyframes sparkle {
  0% {
    transform: translateY(0px) rotate(0deg);
    opacity: 0.6;
  }
  100% {
    transform: translateY(-100px) rotate(360deg);
    opacity: 0;
  }
}
.intro {
  position: relative;
  width: 100%;
  height: 100vh;
  background: url('bg_monochrome.jpg') center/cover no-repeat;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  background-attachment: fixed;
}
.overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.4) 50%, rgba(0, 0, 0, 0.8) 100%);
  top: 0;
  left: 0;
}
.content {
  position: relative;
  z-index: 2;
  padding: 20px;
  max-width: 800px;
  animation: fadeInUp 1.5s ease-out;
}
@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}
.emblem {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto 30px;
  background-image: url(images/queen_sirikit.webp);
  background-size: contain;
  border-radius: 999px;
  filter: grayscale(100%) brightness(1.1) contrast(1.1);
  border: 4px solid rgba(255, 255, 255, 0.3);
  box-shadow:
    0 0 30px rgba(255, 255, 255, 0.3),
    0 0 60px rgba(255, 255, 255, 0.1),
    inset 0 0 20px rgba(255, 255, 255, 0.1);
  transition: all 0.5s ease;
  animation: glow 3s ease-in-out infinite alternate;
}
.emblem:hover {
  transform: scale(1.05);
  filter: grayscale(0%) brightness(1.2) contrast(1.2);
  box-shadow:
    0 0 40px rgba(255, 255, 255, 0.5),
    0 0 80px rgba(255, 255, 255, 0.2),
    inset 0 0 30px rgba(255, 255, 255, 0.2);
}
@keyframes glow {
  0% {
    box-shadow:
      0 0 30px rgba(255, 255, 255, 0.3),
      0 0 60px rgba(255, 255, 255, 0.1),
      inset 0 0 20px rgba(255, 255, 255, 0.1);
  }
  100% {
    box-shadow:
      0 0 40px rgba(255, 255, 255, 0.4),
      0 0 80px rgba(255, 255, 255, 0.2),
      inset 0 0 30px rgba(255, 255, 255, 0.15);
  }
}
/* Golden ring around image */
.emblem::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: linear-gradient(45deg, #ffd700, #ffed4e, #ffd700, #ffed4e) border-box;
  mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  mask-composite: subtract;
  animation: rotate 10s linear infinite;
  opacity: 0.8;
}
@keyframes rotate {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}
h1 {
  font-weight: 600;
  font-size: 2rem;
  line-height: 1.5;
  margin: 0;
  background: linear-gradient(45deg, #ffd700, #ffed4e, #ffd700);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 3s ease-in-out infinite;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}
h2 {
  font-weight: 400;
  margin: 10px 0 20px;
  line-height: 1.6;
  font-size: 1.3rem;
  color: #f0f0f0;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
  animation: fadeInUp 1.5s ease-out 0.5s both;
}
p {
  font-size: 1.1rem;
  color: #ddd;
  margin-bottom: 40px;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.8);
  animation: fadeInUp 1.5s ease-out 1s both;
}
button.enter {
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  border: 2px solid #ffd700;
  color: #fff;
  padding: 12px 30px;
  font-size: 1rem;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
  font-family: 'Sarabun', sans-serif;
  font-weight: 500;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
  animation: fadeInUp 1.5s ease-out 1.5s both;
}
button.enter::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.4), transparent);
  transition: left 0.5s ease;
}
button.enter:hover::before {
  left: 100%;
}
button.enter:hover {
  background: linear-gradient(45deg, #ffd700, #ffed4e);
  color: #000;
  border-color: #ffed4e;
  transform: translateY(-2px);
  box-shadow:
    0 5px 15px rgba(255, 215, 0, 0.4),
    0 0 20px rgba(255, 215, 0, 0.3);
}
body.fade-out {
  opacity: 0;
  transition: opacity 1s ease;
}
/* Responsive Design */
@media (max-width: 768px) {
  .content {
    padding: 15px;
    max-width: 90%;
  }
  h1 {
    font-size: 1.6rem;
  }
  h2 {
    font-size: 1.1rem;
  }
  p {
    font-size: 1rem;
  }
  button.enter {
    padding: 10px 25px;
    font-size: 0.9rem;
  }
}
@media (max-width: 480px) {
  h1 {
    font-size: 1.4rem;
  }
  h2 {
    font-size: 1rem;
  }
}