:root {
  --primary-soft: #8b9fe8;
  --primary-light: #a8b8f0;
  --secondary-soft: #f8d7da;
  --accent-mint: #b8e6b8;
  --accent-peach: #ffd4c4;
  --accent-lavender: #e6d7ff;
  --neutral-100: #fafbfc;
  --neutral-200: #f5f6f8;
  --neutral-300: #e8eaed;
  --neutral-600: #6c7293;
  --neutral-800: #2d3748;
  --shadow-soft: 0 4px 20px rgba(139, 159, 232, 0.08);
  --shadow-medium: 0 8px 25px rgba(139, 159, 232, 0.12);
  --border-radius: 16px;
  --border-radius-sm: 12px;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
}

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

body {
  font-family: "Poppins", -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(135deg, var(--neutral-100) 0%, var(--neutral-200) 100%);
  color: var(--neutral-800);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* Typography */
.title {
  font-size: 2rem;
  font-weight: 600;
  color: var(--neutral-800);
  margin: 0;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--neutral-600);
  margin-top: var(--spacing-xs);
}

/* Header Section */
.certificate-header {
  background: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-soft);
  margin-bottom: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.header-info {
  flex: 1;
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 12px 24px;
  border-radius: var(--border-radius-sm);
  font-family: "Poppins", sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-soft) 0%, var(--primary-light) 100%);
  color: white;
  box-shadow: 0 2px 12px rgba(139, 159, 232, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(139, 159, 232, 0.35);
  color: white;
}

.btn-success {
  background: linear-gradient(135deg, var(--accent-mint) 0%, #a5d6a7 100%);
  color: white;
  box-shadow: 0 2px 12px rgba(184, 230, 184, 0.3);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(184, 230, 184, 0.4);
  color: white;
}

.btn-outline {
  background: rgba(255, 255, 255, 0.7);
  color: var(--neutral-600);
  border: 1px solid var(--neutral-300);
}

.btn-outline:hover {
  background: white;
  border-color: var(--primary-soft);
  color: var(--primary-soft);
}

/* PDF Viewer */
.pdf-viewer-container {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-medium);
  margin-bottom: var(--spacing-md);
}

.pdf-controls {
  background: var(--neutral-100);
  padding: var(--spacing-sm);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  border-bottom: 1px solid var(--neutral-300);
}

.control-btn {
  background: white;
  border: 1px solid var(--neutral-300);
  color: var(--neutral-600);
  padding: 8px 16px;
  border-radius: var(--spacing-xs);
  font-size: 0.8rem;
  transition: all 0.2s ease;
}

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

.page-indicator {
  background: var(--accent-lavender);
  color: var(--neutral-800);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
}

.zoom-indicator {
  background: var(--accent-peach);
  color: var(--neutral-800);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
}

.pdf-content {
  padding: var(--spacing-lg);
  text-align: center;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pdf-canvas {
  max-width: 100%;
  height: auto;
  border-radius: var(--spacing-xs);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--neutral-600);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--neutral-300);
  border-top: 3px solid var(--primary-soft);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
.error-message {
  background: rgba(248, 215, 218, 0.3);
  border: 1px solid var(--secondary-soft);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-lg);
  text-align: center;
  color: var(--neutral-800);
}

/* Certificate Info */
.certificate-info {
  background: white;
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-soft);
}

.info-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--neutral-800);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.info-item {
  padding: var(--spacing-sm);
  background: var(--neutral-100);
  border-radius: var(--spacing-xs);
  border-left: 3px solid var(--primary-soft);
}

.info-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--neutral-600);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-value {
  font-size: 0.95rem;
  color: var(--neutral-800);
  font-weight: 500;
}

.certificate-id {
  font-family: "Monaco", "Menlo", monospace;
  background: var(--accent-lavender);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-sm);
  }
  .header-content {
    flex-direction: column;
    align-items: stretch;
  }
  .header-actions {
    justify-content: stretch;
  }
  .btn {
    flex: 1;
    justify-content: center;
  }
  .title {
    font-size: 1.5rem;
  }
  .pdf-controls {
    flex-wrap: wrap;
    gap: var(--spacing-xs);
  }
  .info-grid {
    grid-template-columns: 1fr;
  }
}
/* Subtle animations */
.certificate-header,
.pdf-viewer-container,
.certificate-info {
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.certificate-header {
  animation-delay: 0.1s;
}

.pdf-viewer-container {
  animation-delay: 0.2s;
}

.certificate-info {
  animation-delay: 0.3s;
}

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