/* ===================================================
   LinguaQuest — Certificate Styles
   Paper texture, stamp SVG, print-ready layout
   =================================================== */

:root {
  --cert-bg: #fdfbf7;
  --cert-border: #d4c5a9;
  --cert-text: #2c2416;
  --cert-accent: #8b6914;
  --cert-muted: #8a7a5a;
  --cert-stamp-red: #8b1a1a;
  --cert-stamp-gold: #b8860b;
}

.certificate-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow-y: auto;
}

.certificate-modal .cert-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  z-index: -1;
}

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

.certificate-modal:not(.active) {
  display: none;
}

/* Certificate Document */
.cert-document {
  width: 100%;
  max-width: 800px;
  aspect-ratio: 1 / 1.414; /* A4 */
  background: var(--cert-bg);
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,0,0,0.1);
  position: relative;
  overflow: hidden;
  margin: auto;
}

/* Paper texture via CSS */
.cert-document::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 24px,
      rgba(180,160,120,0.06) 24px,
      rgba(180,160,120,0.06) 25px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 24px,
      rgba(180,160,120,0.06) 24px,
      rgba(180,160,120,0.06) 25px
    );
  pointer-events: none;
  z-index: 0;
}

/* Noise texture */
.cert-document::after {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
}

.cert-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 48px 56px;
  text-align: center;
}

.cert-border {
  position: absolute;
  inset: 16px;
  border: 2px solid var(--cert-border);
  border-radius: 2px;
  pointer-events: none;
  z-index: 1;
}

.cert-border-inner {
  position: absolute;
  inset: 22px;
  border: 1px solid var(--cert-border);
  opacity: 0.5;
  pointer-events: none;
  z-index: 1;
}

.cert-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.cert-org {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cert-muted);
}

.cert-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--cert-text);
  line-height: 1.1;
  margin: 8px 0;
  letter-spacing: 0.02em;
}

.cert-subtitle {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--cert-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.cert-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  flex: 1;
  justify-content: center;
}

.cert-presented {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--cert-muted);
  font-style: italic;
}

.cert-name {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--cert-text);
  padding-bottom: 4px;
  border-bottom: 2px solid var(--cert-border);
  min-width: 300px;
  text-align: center;
  min-height: 2.5rem;
  line-height: 1.2;
}

.cert-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--cert-text);
  line-height: 1.6;
  max-width: 500px;
}

.cert-desc strong {
  color: var(--cert-accent);
}

.cert-details {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  margin-top: 8px;
}

.cert-detail-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.cert-detail-label {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cert-muted);
  font-family: var(--font-mono);
}

.cert-detail-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--cert-text);
  font-family: var(--font-body);
}

.cert-footer {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  width: 100%;
  padding-top: 16px;
}

.cert-date-block {
  text-align: left;
}

.cert-date {
  font-size: 0.9375rem;
  color: var(--cert-text);
  font-family: var(--font-body);
}

.cert-date-label {
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cert-muted);
  font-family: var(--font-mono);
  margin-top: 2px;
}

/* Stamp SVG */
.cert-stamp {
  width: 100px;
  height: 100px;
  opacity: 0.85;
}

/* QR Code placeholder */
.cert-qr {
  width: 60px;
  height: 60px;
  opacity: 0.3;
}

/* Certificate Actions */
.cert-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 20px;
}

/* Print styles */
@media print {
  body * { visibility: hidden; }
  .cert-document, .cert-document * { visibility: visible; }
  .cert-document {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    max-width: none;
    box-shadow: none;
    border-radius: 0;
  }
  .cert-actions, .certificate-modal .cert-backdrop { display: none !important; }
}

/* Responsive */
@media (max-width: 600px) {
  .cert-document { aspect-ratio: auto; min-height: 600px; }
  .cert-content { padding: 32px 24px; }
  .cert-title { font-size: 1.75rem; }
  .cert-name { font-size: 1.5rem; min-width: 200px; }
  .cert-footer { flex-direction: column; align-items: center; gap: 16px; }
}