:root {
  --primary: #5B5FEF;
  --primary-hover: #4A4ED9;
  --secondary: #FF6B6B;
  --accent: #00D9A5;
  --success: #00D9A5;
  --warning: #FFB84D;
  --danger: #FF6B6B;
  --bg-main: #F0F4FF;
  --bg-card: #FFFFFF;
  --text-primary: #1A1D3D;
  --text-secondary: #6B7194;
  --text-muted: #9CA3C7;
  --border-color: #E4E8F7;
  --shadow: 0 20px 60px rgba(91, 95, 239, 0.15);
  --shadow-sm: 0 4px 20px rgba(91, 95, 239, 0.1);
}

[data-theme="dark"] {
  --bg-main: #0F1129;
  --bg-card: #1A1D3D;
  --text-primary: #FFFFFF;
  --text-secondary: #9CA3C7;
  --text-muted: #6B7194;
  --border-color: #2D3154;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-main);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.3s ease;
}

/* Floating Shapes */
.floating-shapes {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.6;
  animation: float 20s infinite ease-in-out;
}

.shape-1 {
  width: 300px;
  height: 300px;
  background: var(--primary);
  opacity: 0.08;
  top: -100px;
  right: -100px;
  animation-delay: 0s;
}

.shape-2 {
  width: 200px;
  height: 200px;
  background: var(--secondary);
  opacity: 0.08;
  bottom: 10%;
  left: -50px;
  animation-delay: -5s;
}

.shape-3 {
  width: 150px;
  height: 150px;
  background: var(--accent);
  opacity: 0.08;
  top: 40%;
  right: 5%;
  animation-delay: -10s;
}

.shape-4 {
  width: 100px;
  height: 100px;
  background: var(--warning);
  opacity: 0.1;
  bottom: 20%;
  right: 20%;
  animation-delay: -15s;
}

.shape-5 {
  width: 250px;
  height: 250px;
  background: var(--primary);
  opacity: 0.05;
  top: 60%;
  left: 10%;
  animation-delay: -8s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-20px) rotate(5deg); }
  50% { transform: translateY(0) rotate(0deg); }
  75% { transform: translateY(20px) rotate(-5deg); }
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
  z-index: 1000;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  transform: scale(1.05);
  border-color: var(--primary);
  color: var(--primary);
}

/* Main Container */
.main-container {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  position: relative;
  z-index: 1;
}

/* Payment Card */
.payment-card {
  background: var(--bg-card);
  border-radius: 28px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow);
  overflow: hidden;
  animation: slideUp 0.5s ease-out;
  border: 1px solid var(--border-color);
  transition: background 0.3s ease, border-color 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Card Header */
.card-header {
  background: var(--primary);
  padding: 32px 24px;
  text-align: center;
  color: #FFFFFF;
}

.logo-container {
  width: 72px;
  height: 72px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 2rem;
}

.card-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.card-header .subtitle {
  font-size: 0.875rem;
  opacity: 0.85;
  font-weight: 400;
}

/* Amount Section */
.amount-section {
  padding: 28px 24px;
  text-align: center;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
}

.amount-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 600;
}

.amount-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-top: 8px;
  letter-spacing: -1px;
}

/* Timer Section */
.timer-section {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px;
  background: #FFF8E6;
  color: #B8860B;
  font-size: 0.9rem;
  font-weight: 500;
}

[data-theme="dark"] .timer-section {
  background: rgba(255, 184, 77, 0.15);
  color: var(--warning);
}

.countdown {
  font-weight: 700;
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
}

/* QR Section */
.qr-section {
  padding: 24px;
}

.qr-wrapper {
  background: #FFFFFF;
  border-radius: 20px;
  padding: 24px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 280px;
  border: 2px dashed var(--border-color);
}

[data-theme="dark"] .qr-wrapper {
  background: #FFFFFF;
}

.qr-wrapper canvas {
  max-width: 100%;
  height: auto !important;
  border-radius: 12px;
}

/* Loading Spinner */
.loading-spinner {
  text-align: center;
  color: var(--text-secondary);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Merchant Info */
.merchant-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px;
  background: #E6FFF6;
  color: #00A67E;
  font-weight: 600;
  margin: 0 24px;
  border-radius: 14px;
}

[data-theme="dark"] .merchant-info {
  background: rgba(0, 217, 165, 0.15);
  color: var(--accent);
}

/* Action Buttons */
.action-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 20px 24px;
}

.btn-action {
  padding: 14px 12px;
  border-radius: 14px;
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.btn-action i {
  font-size: 1.2rem;
}

.btn-download {
  background: var(--primary);
  color: #FFFFFF;
}

.btn-download:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}

.btn-copy {
  background: var(--bg-main);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-copy:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-share {
  background: var(--accent);
  color: #FFFFFF;
}

.btn-share:hover {
  background: #00C495;
  transform: translateY(-2px);
}

/* Status Section */
.status-section {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 16px 24px;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.status-item i {
  color: var(--accent);
  font-size: 0.9rem;
}

/* Divider */
.divider {
  margin: 0 24px;
  border: none;
  border-top: 1px solid var(--border-color);
}

/* Instructions */
.instructions {
  padding: 24px;
  color: var(--text-primary);
}

.instructions h6 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.instructions h6 i {
  color: var(--primary);
}

.steps {
  display: grid;
  gap: 12px;
}

.step {
  display: flex;
  align-items: center;
  gap: 14px;
}

.step-number {
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #FFFFFF;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.step p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

/* Supported Payment */
.supported-payment {
  padding: 16px 24px;
  text-align: center;
}

.supported-payment p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.payment-icons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.payment-badge {
  padding: 8px 14px;
  background: var(--bg-main);
  border-radius: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* Card Footer */
.card-footer {
  background: var(--bg-main);
  padding: 16px 24px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 500;
}

.card-footer i {
  color: var(--accent);
}

/* Alert Styles */
.alert {
  margin: 16px 24px;
  border-radius: 14px;
  font-size: 0.875rem;
  border: none;
  font-weight: 500;
  padding: 14px 16px;
}

.alert-success {
  background: #E6FFF6;
  color: #00A67E;
}

.alert-danger {
  background: #FFE6E6;
  color: #D63031;
}

.alert-warning {
  background: #FFF8E6;
  color: #B8860B;
}

[data-theme="dark"] .alert-success {
  background: rgba(0, 217, 165, 0.15);
}

[data-theme="dark"] .alert-danger {
  background: rgba(255, 107, 107, 0.15);
}

[data-theme="dark"] .alert-warning {
  background: rgba(255, 184, 77, 0.15);
}

/* Responsive */
@media (max-width: 480px) {
  .main-container {
    padding: 12px;
  }
  
  .payment-card {
    border-radius: 24px;
  }
  
  .card-header {
    padding: 28px 20px;
  }
  
  .amount-value {
    font-size: 2rem;
  }
  
  .action-buttons {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  .btn-action {
    flex-direction: row;
    justify-content: center;
    padding: 14px 20px;
  }
  
  .status-section {
    gap: 16px;
  }
  
  .status-item span {
    display: none;
  }
  
  .status-item i {
    font-size: 1.2rem;
  }
  
  .shape-1 { width: 200px; height: 200px; }
  .shape-2 { width: 150px; height: 150px; }
  .shape-3 { width: 100px; height: 100px; }
  .shape-4 { width: 80px; height: 80px; }
  .shape-5 { width: 180px; height: 180px; }
}

@media (max-width: 360px) {
  .card-header h1 {
    font-size: 1.3rem;
  }
  
  .amount-value {
    font-size: 1.75rem;
  }
  
  .payment-icons {
    gap: 6px;
  }
  
  .payment-badge {
    padding: 6px 10px;
    font-size: 0.7rem;
  }
}

/* Tablet and Desktop */
@media (min-width: 768px) {
  .payment-card {
    max-width: 460px;
  }
  
  .theme-toggle {
    top: 30px;
    right: 30px;
  }
}