:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #16161f;
  --border-color: rgba(120, 120, 180, 0.15);
  --accent-cyan: #00e5ff;
  --accent-purple: #a78bfa;
  --accent-green: #34d399;
  --accent-red: #f87171;
  --text-primary: #e4e4ef;
  --text-secondary: #9494a8;
  --text-muted: #6b6b80;
  --glow-cyan: rgba(0, 229, 255, 0.4);
  --glow-purple: rgba(167, 139, 250, 0.3);
}

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

body {
  font-family: 'Noto Sans SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Background grid */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(120, 120, 180, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 120, 180, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* Floating orbs */
.floating-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  pointer-events: none;
  animation: float 20s ease-in-out infinite;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-cyan), transparent 70%);
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.orb-2 {
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, var(--accent-purple), transparent 70%);
  bottom: -80px;
  left: -80px;
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(-30px, 40px) scale(1.1); }
  50% { transform: translate(20px, -30px) scale(0.95); }
  75% { transform: translate(-20px, -20px) scale(1.05); }
}

/* Container */
.container {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem 1.5rem;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 2.5rem;
  animation: fadeInDown 0.8s ease-out;
}

.title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.title-icon {
  color: var(--accent-cyan);
  font-size: 1.5rem;
  animation: pulse 2s ease-in-out infinite;
}

.title-text {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.5rem;
  letter-spacing: 0.1em;
}

/* Card */
.main-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.card-glow {
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--accent-cyan), transparent, var(--accent-purple));
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.main-card:hover .card-glow {
  opacity: 0.15;
}

/* Input */
.input-group {
  margin-bottom: 1.5rem;
}

.input-label {
  display: block;
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
}

.input-wrapper {
  position: relative;
}

.card-input {
  width: 100%;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  color: var(--text-primary);
  font-family: 'Orbitron', 'Noto Sans SC', monospace;
  font-size: 1.1rem;
  letter-spacing: 0.15em;
  text-align: center;
  outline: none;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.card-input::placeholder {
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.card-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--glow-cyan), 0 0 20px rgba(0, 229, 255, 0.1);
}

.input-border {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.card-input:focus + .input-border {
  opacity: 0.2;
}

/* Submit button */
.submit-btn {
  width: 100%;
  padding: 1rem;
  background: linear-gradient(135deg, var(--accent-cyan), #00b4d8);
  border: none;
  border-radius: 0.75rem;
  color: var(--bg-primary);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.3s ease, opacity 0.3s ease;
}

.submit-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--glow-cyan);
}

.submit-btn:active {
  transform: translateY(0);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Result area */
.result-area {
  margin-top: 1.5rem;
  padding: 1.25rem;
  background: rgba(52, 211, 153, 0.08);
  border: 1px solid rgba(52, 211, 153, 0.2);
  border-radius: 0.75rem;
  animation: slideIn 0.4s ease-out;
}

.result-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.result-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent-green);
  color: var(--bg-primary);
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
}

.result-title {
  color: var(--accent-green);
  font-weight: 600;
}

.email-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-radius: 0.5rem;
  margin-bottom: 0.75rem;
}

.email-display code {
  font-family: 'Orbitron', monospace;
  font-size: 0.95rem;
  color: var(--text-primary);
  word-break: break-all;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.copy-btn:hover {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--bg-primary);
}

.copy-btn.copied {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: var(--bg-primary);
}

.remaining-info {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.highlight {
  color: var(--accent-cyan);
  font-weight: 700;
}

/* Error area */
.error-area {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: rgba(248, 113, 113, 0.08);
  border: 1px solid rgba(248, 113, 113, 0.2);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--accent-red);
  font-size: 0.9rem;
  animation: shake 0.4s ease-out;
}

.error-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent-red);
  color: var(--bg-primary);
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* Footer */
.footer {
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* Animations */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Responsive */
@media (max-width: 480px) {
  .title {
    font-size: 1.5rem;
  }
  
  .main-card {
    padding: 1.5rem;
  }
  
  .card-input {
    font-size: 0.95rem;
    padding: 0.85rem 1rem;
  }
}