/* 70/20/10 Color System: #FFFFFF (70%) / #000000 (20%) / #D4AF37 (10%) */
:root {
  --white: #FFFFFF;
  --black: #000000;
  --gold: #D4AF37;
  --gold-light: #F4E5A1;
  --gold-dark: #B8860B;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Arial", sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
}

/* Glowing light effects */
.luxury-glow {
  box-shadow: 0 0 20px rgba(212, 175, 55, 0.15);
}

.luxury-glow-strong {
  box-shadow: 0 0 40px rgba(212, 175, 55, 0.25);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--black);
  font-weight: 300;
  letter-spacing: 0.05em;
}

p {
  color: var(--black);
  opacity: 0.8;
  font-size: 16px;
  margin-bottom: 12px;
}

/* Luxury buttons */
.luxury-btn-primary {
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: var(--white);
  border: none;
  padding: 16px 32px;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.luxury-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(212, 175, 55, 0.4);
}

.luxury-btn-secondary {
  background: transparent;
  color: var(--gold);
  border: 2px solid var(--gold);
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s ease;
}

.luxury-btn-secondary:hover {
  background: var(--gold);
  color: var(--white);
}

/* Feature cards */
.feature-card {
  background: var(--white);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 12px;
  padding: 40px 30px;
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--gold-light), var(--gold));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 5px 15px rgba(212, 175, 55, 0.3);
}

/* Diamond cards */
.diamond-card {
  background: var(--white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
  transition: all 0.4s ease;
  cursor: pointer;
}

.diamond-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.diamond-preview {
  position: relative;
  height: 300px;
  overflow: hidden;
}

.diamond-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(212, 175, 55, 0.1), rgba(212, 175, 55, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.diamond-card:hover .diamond-overlay {
  opacity: 1;
}

/* Search container */
.search-container {
  background: var(--white);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

/* Luxury slider */
.luxury-slider {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: linear-gradient(90deg, var(--gold-light), var(--gold));
  border-radius: 3px;
  outline: none;
}

.luxury-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--gold);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(212, 175, 55, 0.4);
}

/* Luxury select */
.luxury-select {
  background: var(--white);
  border: 2px solid rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--black);
  cursor: pointer;
  transition: all 0.3s ease;
}

.luxury-select:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

/* Filter tags */
.filter-tag {
  background: transparent;
  border: 1px solid rgba(0, 0, 0, 0.2);
  color: var(--black);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-tag.active,
.filter-tag:hover {
  background: var(--gold);
  color: var(--white);
  border-color: var(--gold);
}

/* Navigation hover effects */
nav a {
  position: relative;
  color: var(--black);
  text-decoration: none;
  transition: color 0.3s ease;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: width 0.3s ease;
}

nav a:hover {
  color: var(--gold);
}

nav a:hover::after {
  width: 100%;
}

/* Responsive animations */
@media (max-width: 768px) {
  .feature-card,
  .diamond-card {
    margin-bottom: 20px;
  }
  
  .luxury-btn-primary,
  .luxury-btn-secondary {
    width: 100%;
    margin-bottom: 10px;
  }
}

/* Loading shimmer effect */
@keyframes shimmer {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}

.shimmer {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200px 100%;
  animation: shimmer 1.5s infinite;
}

/* Scroll animations */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Gold text accents */
.gold-accent {
  color: var(--gold);
  font-weight: 600;
}

/* Card hover light effect */
.card-hover-light {
  position: relative;
  overflow: hidden;
}

.card-hover-light::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(212, 175, 55, 0.1), transparent);
  transform: rotate(45deg);
  transition: all 0.6s ease;
  opacity: 0;
}

.card-hover-light:hover::before {
  opacity: 1;
  animation: shimmer-light 0.6s ease;
}

@keyframes shimmer-light {
  0% {
    transform: translateX(-100%) translateY(-100%) rotate(45deg);
  }
  100% {
    transform: translateX(100%) translateY(100%) rotate(45deg);
  }
}