/* Base background & text */
body {
  background-color: var(--color-background-dark) !important;
  color: var(--color-muted-grey);
  font-family: 'Poppins', 'Inter', sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.5s ease, color 0.5s ease;
  user-select: none;
  padding-bottom: 5rem;
  padding-top: 150px;
}
/* Base background & text */
.body-dark {
  background-color: var(--color-background-dark) !important;
  color: var(--color-muted-grey);
  font-family: 'Poppins', 'Inter', sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.5s ease, color 0.5s ease;
  user-select: none;
  padding-bottom: 5rem;
  padding-top: 150px;
}

/* Typography */
.heading {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  color: var(--color-gold);
  text-shadow:
    0 0 5px rgba(212, 175, 55, 0.8),
    0 0 10px rgba(212, 175, 55, 0.6);
  transition: color 0.4s ease;
}

.heading-xl {
  font-size: 3rem;
  line-height: 1.1;
  letter-spacing: 0.1em;
}

.heading-lg-blue {
  font-size: 2rem;
  color: var(--color-sapphire-blue);
  text-shadow:
    0 0 8px rgba(15, 82, 186, 0.9),
    0 0 15px rgba(15, 82, 186, 0.6);
}

.paragraph {
  font-size: 1rem;
  color: var(--color-muted-grey);
  letter-spacing: 0.03em;
  transition: color 0.3s ease;
  margin-bottom: 1.25rem;
}

/* Links */
a {
  color: var(--color-sapphire-blue);
  text-decoration: none;
  transition: color 0.3s ease, text-shadow 0.3s ease;
  position: relative;
  cursor: pointer;
}
a:hover, a:focus {
  color: var(--color-gold);
  text-shadow: 0 0 8px var(--color-gold);
  outline: none;
}

/* Button Base */
.btn {
  border-radius: 0.4rem;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 2px 7px rgba(0,0,0,0.3);
  transition:
    background-color 0.35s ease,
    color 0.35s ease,
    box-shadow 0.35s ease,
    transform 0.2s ease;
  user-select: none;
}

/* Gold Outline Button */
.btn-outline-gold {
  border: 2px solid var(--color-gold);
  background: transparent;
  color: var(--color-gold);
  box-shadow:
    0 0 8px var(--color-gold);
}
.btn-outline-gold:hover,
.btn-outline-gold:focus {
  background-color: var(--color-gold);
  color: var(--color-navy-blue);
  box-shadow:
    0 0 15px var(--color-gold),
    0 0 30px var(--color-gold);
  transform: scale(1.1);
  outline: none;
}

/* Sapphire Outline Button */
.btn-outline-sapphire-blue {
  border: 2px solid var(--color-sapphire-blue);
  background: transparent;
  color: var(--color-sapphire-blue);
  box-shadow:
    0 0 8px var(--color-sapphire-blue);
}
.btn-outline-sapphire-blue:hover,
.btn-outline-sapphire-blue:focus {
  background-color: var(--color-sapphire-blue);
  color: var(--color-white);
  box-shadow:
    0 0 15px var(--color-sapphire-blue),
    0 0 30px var(--color-sapphire-blue);
  transform: scale(1.1);
  outline: none;
}

/* Info Outline Button */
.btn-outline-info {
  border: 2px solid var(--color-info);
  background: transparent;
  color: var(--color-info);
  box-shadow:
    0 0 8px var(--color-info);
}
.btn-outline-info:hover,
.btn-outline-info:focus {
  background-color: var(--color-info);
  color: var(--color-background-dark);
  box-shadow:
    0 0 15px var(--color-info),
    0 0 30px var(--color-info);
  transform: scale(1.1);
  outline: none;
}

/* Sapphire Blue Button */
.btn-sapphire-blue {
  background-color: var(--color-sapphire-blue);
  color: var(--color-white);
  box-shadow: 0 5px 15px rgba(15, 82, 186, 0.7);
}
.btn-sapphire-blue:hover,
.btn-sapphire-blue:focus {
  background-color: #0c3b82;
  box-shadow: 0 8px 25px rgba(15, 82, 186, 0.85);
  transform: scale(1.05);
  outline: none;
}

/* Gold Button */
.btn-gold {
  background-color: var(--color-gold);
  color: var(--color-navy-blue);
  font-weight: 700;
  box-shadow: 0 5px 15px rgba(212, 175, 55, 0.85);
}
.btn-gold:hover,
.btn-gold:focus {
  background-color: #b28f2c;
  color: var(--color-white);
  box-shadow: 0 10px 25px rgba(212, 175, 55, 1);
  transform: scale(1.05);
  outline: none;
}

/* Filter Buttons Container */
.d-flex.justify-content-center.gap-3.mb-4.flex-wrap {
  user-select: none;
}

/* Filter button active state */
.filter-btn.active {
  border-width: 3px !important;
  box-shadow:
    0 0 10px var(--color-gold),
    0 0 25px var(--color-gold);
  transform: scale(1.12);
}

/* Collection Cards Grid */
#collection-container {
  perspective: 1200px;
  /* Subtle 3D perspective for card hover */
}

/* Individual Cards */
.collection-card {
  border-radius: 0.7rem;
  border-width: 2.5px !important;
  transition:
    transform 0.5s cubic-bezier(0.215, 0.61, 0.355, 1),
    box-shadow 0.5s ease,
    border-color 0.5s ease;
  cursor: pointer;
  will-change: transform, box-shadow;
  user-select: none;
  backface-visibility: hidden;
  overflow: hidden;
  box-shadow:
    inset 0 0 15px rgba(255 255 255 / 0.05),
    0 8px 15px rgba(0 0 0 / 0.6);
  filter: drop-shadow(0 1.5rem 1rem rgba(0,0,0,0.4));
  background-clip: padding-box;
}

/* Card hover */
.collection-card:hover {
  transform: translateY(-15px) rotateX(4deg) rotateY(2deg) scale(1.03);
  box-shadow:
    0 20px 40px rgba(212, 175, 55, 0.85),
    0 0 30px rgba(212, 175, 55, 0.5);
  border-color: var(--color-gold) !important;
  z-index: 5;
  transition-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
}

/* Card images */
.collection-card img {
  border-top-left-radius: 0.7rem;
  border-top-right-radius: 0.7rem;
  object-fit: contain;
  max-height: 240px;
  width: 100%;
  transition: transform 0.7s ease;
  box-shadow:
    inset 0 0 15px rgba(255 255 255 / 0.1);
}
.collection-card:hover img {
  transform: scale(1.1) rotate(1deg);
}
/* Card body */
.card-body {
  padding: 1.5rem 1.5rem 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--color-light-beige);
}
/* Card titles */
.card-title {
  font-weight: 700;
  font-size: 1.3rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  color: inherit;
  text-shadow:
    0 0 5px rgba(212, 175, 55, 0.7);
  transition: color 0.4s ease;
}
@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.heading-animate,
.btn-animate {
  opacity: 0;
  animation: fadeInScale 0.9s ease forwards;
}

/* Staggered delays for headings */
h1.heading-animate { animation-delay: 0.2s; }
h2.heading-animate { animation-delay: 0.3s; }
h3.heading-animate { animation-delay: 0.4s; }

/* Staggered delays for buttons */
.btn.btn-animate:nth-of-type(1) { animation-delay: 0.5s; }
.btn.btn-animate:nth-of-type(2) { animation-delay: 0.6s; }
.btn.btn-animate:nth-of-type(3) { animation-delay: 0.7s; }

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

.collection-card.animate-entry {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

/* Staggered delay using nth-child */
.collection-card.animate-entry:nth-child(1) { animation-delay: 0.1s; }
.collection-card.animate-entry:nth-child(2) { animation-delay: 0.2s; }
.collection-card.animate-entry:nth-child(3) { animation-delay: 0.3s; }
.collection-card.animate-entry:nth-child(4) { animation-delay: 0.4s; }
.collection-card.animate-entry:nth-child(5) { animation-delay: 0.5s; }
.collection-card.animate-entry:nth-child(6) { animation-delay: 0.6s; }
.collection-card.animate-entry:nth-child(7) { animation-delay: 0.7s; }
.collection-card.animate-entry:nth-child(8) { animation-delay: 0.8s; }
/* Add more if you have more cards */