/* ============================================
   CERTIFICATE SYSTEM STYLES
   ============================================ */

.certificates-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  padding-bottom: 100px; /* Space for bottom nav */
}

.certificates-header {
  text-align: center;
  margin-bottom: 48px;
}

.certificates-title {
  font-size: 36px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #ffffff 0%, #00ffcc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.certificates-subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   CERTIFICATES GRID
   ============================================ */

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.certificate-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.certificate-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #00ff88 0%, #00ccff 100%);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.certificate-card:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 255, 136, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 255, 136, 0.2);
}

.certificate-card:hover::before {
  transform: scaleX(1);
}

.certificate-preview {
  background: linear-gradient(135deg, rgba(0, 255, 136, 0.1) 0%, rgba(0, 204, 255, 0.1) 100%);
  border: 2px solid rgba(0, 255, 136, 0.3);
  border-radius: 12px;
  aspect-ratio: 1.414 / 1; /* A4 ratio */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  margin-bottom: 16px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.certificate-preview::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  bottom: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  pointer-events: none;
}

.certificate-icon {
  font-size: 48px;
  margin-bottom: 16px;
  filter: drop-shadow(0 4px 8px rgba(0, 255, 136, 0.3));
}

.certificate-name {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.certificate-course {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 12px;
}

.certificate-date {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
}

.certificate-actions {
  display: flex;
  gap: 8px;
}

.certificate-actions .btn {
  flex: 1;
  padding: 10px 16px;
  font-size: 14px;
  border-radius: 8px;
}

/* ============================================
   EMPTY STATE
   ============================================ */

.certificates-empty {
  text-align: center;
  padding: 80px 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 2px dashed rgba(255, 255, 255, 0.1);
  border-radius: 16px;
}

.certificates-empty-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.5;
}

.certificates-empty-title {
  font-size: 24px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.certificates-empty-text {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 28px;
  line-height: 1.6;
}

/* ============================================
   CERTIFICATE MODAL (Full View)
   ============================================ */

.certificate-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.certificate-modal.active {
  display: flex;
}

.certificate-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(12px);
}

.certificate-modal-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
}

.certificate-modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  font-size: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  z-index: 10;
}

.certificate-modal-close:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: #00ff88;
  color: #00ff88;
  transform: rotate(90deg);
}

/* ============================================
   FULL CERTIFICATE DESIGN
   ============================================ */

.certificate-full {
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
  border: 3px solid #00ff88;
  border-radius: 16px;
  padding: 60px 50px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 255, 136, 0.3);
  text-align: center;
  animation: certificateSlideIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes certificateSlideIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Decorative border */
.certificate-full::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 12px;
  right: 12px;
  bottom: 12px;
  border: 1px solid rgba(0, 255, 136, 0.3);
  border-radius: 12px;
  pointer-events: none;
}

/* Corner ornaments */
.certificate-corner {
  position: absolute;
  width: 40px;
  height: 40px;
  border: 2px solid #00ff88;
}

.certificate-corner.top-left {
  top: 24px;
  left: 24px;
  border-right: none;
  border-bottom: none;
}

.certificate-corner.top-right {
  top: 24px;
  right: 24px;
  border-left: none;
  border-bottom: none;
}

.certificate-corner.bottom-left {
  bottom: 24px;
  left: 24px;
  border-right: none;
  border-top: none;
}

.certificate-corner.bottom-right {
  bottom: 24px;
  right: 24px;
  border-left: none;
  border-top: none;
}

.certificate-logo {
  font-size: 20px;
  font-weight: 700;
  color: #00ff88;
  margin-bottom: 32px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.certificate-type {
  font-size: 48px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 32px;
  text-transform: uppercase;
  letter-spacing: 3px;
  background: linear-gradient(135deg, #ffffff 0%, #00ffcc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.certificate-awarded-to {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.certificate-recipient {
  font-size: 40px;
  font-weight: 700;
  color: #00ff88;
  margin-bottom: 32px;
  font-family: 'Georgia', serif;
  border-bottom: 2px solid rgba(0, 255, 136, 0.3);
  padding-bottom: 12px;
  display: inline-block;
}

.certificate-description {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.certificate-course-name {
  font-size: 24px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 40px;
}

.certificate-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.certificate-date-section {
  text-align: left;
}

.certificate-date-label {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.certificate-date-value {
  font-size: 16px;
  font-weight: 600;
  color: #00ff88;
}

.certificate-signature {
  text-align: right;
}

.certificate-signature-line {
  width: 200px;
  border-top: 2px solid rgba(255, 255, 255, 0.3);
  margin-bottom: 8px;
}

.certificate-signature-name {
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
}

.certificate-signature-title {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
}

/* Certificate actions in modal */
.certificate-modal-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

/* ============================================
   STATS SECTION
   ============================================ */

.certificates-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.certificate-stat {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.certificate-stat:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 255, 136, 0.3);
}

.certificate-stat-value {
  font-size: 40px;
  font-weight: 700;
  color: #00ff88;
  margin-bottom: 8px;
}

.certificate-stat-label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  .certificates-container {
    padding: 16px;
  }
  
  .certificates-title {
    font-size: 28px;
  }
  
  .certificates-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .certificate-full {
    padding: 40px 24px;
  }
  
  .certificate-type {
    font-size: 32px;
  }
  
  .certificate-recipient {
    font-size: 28px;
  }
  
  .certificate-description {
    font-size: 16px;
  }
  
  .certificate-course-name {
    font-size: 20px;
  }
  
  .certificate-footer {
    flex-direction: column;
    align-items: center;
    gap: 24px;
  }
  
  .certificate-date-section,
  .certificate-signature {
    text-align: center;
  }
  
  .certificate-modal-actions {
    flex-direction: column;
  }
  
  .certificate-modal-actions .btn {
    width: 100%;
  }
}