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

:root {
  /* Cyberpunk Color Palette */
  --neon-blue: #00d9ff;
  --neon-purple: #bd00ff;
  --neon-pink: #ff0080;
  --neon-green: #00ff41;
  --neon-cyan: #00ffff;
  --neon-yellow: #ffff00;
  --neon-orange: #ff6600;
  --neon-red: #ff0040;
  
  /* Enhanced Glass Effects */
  --glass-bg: rgba(0, 20, 40, 0.4);
  --glass-border: rgba(0, 255, 255, 0.3);
  --glass-shadow: rgba(0, 255, 255, 0.2);
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #a0c4ff;
  --text-glow: #00ffff;
}

body {
  font-family: "Arial", sans-serif;
  background: #000000;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
}

/* Background Effects */
.background-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -3;
  overflow: hidden;
}

.gradient-bg {
  position: absolute;
  width: 200%;
  height: 200%;
  background: radial-gradient(
      circle at 20% 50%,
      var(--neon-blue) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      var(--neon-purple) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 20%,
      var(--neon-pink) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 60% 60%,
      var(--neon-orange) 0%,
      transparent 50%
    );
  animation: gradientShift 60s ease-in-out infinite;
  opacity: 0.1;
}

.background-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: -2;
  pointer-events: none;
}

@keyframes gradientShift {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(-20%, 10%) rotate(180deg);
  }
}

/* Glass Effect */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 15px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 20px 50px;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  background: linear-gradient(
    45deg,
    var(--neon-blue),
    var(--neon-purple)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 30px;
  list-style: none;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.3s ease;
  padding: 10px 20px;
  border-radius: 25px;
}

.nav-links a:hover {
  background: var(--glass-bg);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
}

/* Main Content */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 120px 20px 80px;
}

.content-container {
  padding: 40px;
}

h1 {
  font-size: 48px;
  margin-bottom: 20px;
  text-align: center;
  background: linear-gradient(
    45deg,
    var(--neon-orange),
    var(--neon-pink)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.coffee-emoji {
  font-size: 60px;
  text-align: center;
  margin-bottom: 20px;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.intro-text {
  text-align: center;
  font-size: 18px;
  margin-bottom: 40px;
  color: var(--text-secondary);
}

.highlight {
  color: var(--neon-cyan);
  font-weight: bold;
}

/* Payment Options Grid */
.payment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.payment-card {
  padding: 30px;
  position: relative;
  cursor: pointer;
  transition: all 0.3s ease;
  overflow: hidden;
}

.payment-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
}

.payment-card::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, var(--card-color), transparent);
  border-radius: 15px;
  opacity: 0;
  z-index: -1;
  transition: opacity 0.3s ease;
}

.payment-card:hover::before {
  opacity: 0.3;
}

.payment-icon {
  font-size: 48px;
  text-align: center;
  margin-bottom: 20px;
  color: var(--card-color);
}

.payment-title {
  font-size: 24px;
  font-weight: bold;
  text-align: center;
  margin-bottom: 15px;
  color: var(--card-color);
}

.payment-description {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.payment-address {
  background: rgba(0, 0, 0, 0.3);
  padding: 15px;
  border-radius: 10px;
  font-family: "Courier New", monospace;
  font-size: 14px;
  word-break: break-all;
  margin-bottom: 15px;
  border: 1px solid var(--glass-border);
}

.copy-btn {
  display: block;
  width: 100%;
  padding: 12px;
  background: linear-gradient(45deg, var(--card-color), transparent);
  color: var(--text-primary);
  border: 1px solid var(--card-color);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 14px;
}

.copy-btn:hover {
  background: var(--card-color);
  box-shadow: 0 0 20px var(--card-color);
  transform: scale(1.02);
}

/* Crypto Cards */
.solana {
  --card-color: #9945ff;
}
.ethereum {
  --card-color: #627eea;
}
.revolut {
  --card-color: #0075eb;
}
.paypal {
  --card-color: #0070ba;
}

/* Back Button */
.back-btn {
  display: inline-block;
  padding: 12px 30px;
  background: linear-gradient(
    45deg,
    var(--neon-blue),
    var(--neon-purple)
  );
  color: white;
  text-decoration: none;
  border-radius: 30px;
  transition: all 0.3s ease;
  margin-bottom: 30px;
}

.back-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 30px var(--neon-blue);
}

/* Thank You Message */
.thank-you {
  text-align: center;
  padding: 30px;
  margin-top: 40px;
  background: linear-gradient(45deg, var(--neon-green), var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 18px;
  font-weight: bold;
}

/* QR Code Placeholder */
.qr-placeholder {
  width: 120px;
  height: 120px;
  background: var(--glass-bg);
  border: 2px dashed var(--glass-border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 20px auto;
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
  header {
    padding: 15px 20px;
  }

  .nav-links {
    gap: 15px;
  }

  main {
    padding: 100px 10px 60px;
  }

  .content-container {
    padding: 20px;
  }

  h1 {
    font-size: 36px;
  }

  .payment-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}