/* ==========================================================================
   YuanQi Studio — Payment System Shared Styles
   Includes: Modal, CTA buttons, Answer mask, Premium cards, Skeleton, Responsive
   ========================================================================== */

/* === Payment Modal Overlay === */
.payment-modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 18, 8, 0.7);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  animation: fadeIn 0.2s ease;
}

.payment-modal-overlay.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* === Payment Modal === */
.payment-modal {
  background: var(--card-bg);
  border: 1px solid var(--border-dark);
  border-radius: 16px;
  padding: 36px 32px 28px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  position: relative;
  box-shadow: 0 20px 60px rgba(26, 18, 8, 0.25);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.payment-modal-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.payment-modal-description {
  font-size: 13px;
  color: var(--ink-muted);
  font-style: italic;
  line-height: 1.6;
  margin-bottom: 16px;
}

.payment-modal-amount {
  font-size: 32px;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.payment-modal-amount .currency {
  font-size: 18px;
  font-weight: 400;
  vertical-align: super;
  margin-right: 2px;
}

.payment-modal-actions {
  display: flex;
  gap: 12px;
}

.payment-modal-cancel,
.payment-modal-confirm {
  flex: 1;
  padding: 13px 16px;
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.payment-modal-cancel {
  background: #fff;
  color: var(--ink-light);
  border: 1px solid var(--border);
}

.payment-modal-cancel:hover {
  border-color: var(--border-dark);
  background: var(--gold-pale);
}

.payment-modal-confirm {
  background: var(--gold);
  color: var(--ink);
  font-weight: 600;
}

.payment-modal-confirm:hover {
  background: var(--gold-light);
  transform: translateY(-1px);
}

.payment-modal-confirm:disabled {
  background: var(--border-dark);
  color: var(--ink-muted);
  cursor: not-allowed;
  transform: none;
}

.payment-modal-confirm .spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(26, 18, 8, 0.2);
  border-top-color: var(--ink);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

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

/* === Payment CTA Button === */
.payment-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--gold);
  color: var(--ink);
  border: none;
  border-radius: 10px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.25s;
  box-shadow: 0 4px 16px rgba(200, 150, 42, 0.3);
}

.payment-cta-btn:hover {
  background: var(--gold-light);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(200, 150, 42, 0.4);
}

.payment-cta-btn.unlocked {
  background: var(--ink-muted);
  color: #fff;
  cursor: default;
  box-shadow: none;
  transform: none;
}

.payment-cta-btn.unlocked:hover {
  background: var(--ink-muted);
  transform: none;
  box-shadow: none;
}

.payment-cta-btn.loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.payment-cta-btn.loading::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(26, 18, 8, 0.2);
  border-top-color: var(--ink);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* === Answer Unlock CTA (Ask a Master) === */
.answer-unlock-cta {
  text-align: center;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--border);
}

/* === Answer Mask (Ask a Master) === */
.answer-masked {
  position: relative;
  max-height: 6em;
  overflow: hidden;
  transition: max-height 0.6s ease, opacity 0.4s ease;
}

.answer-masked::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4em;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--bg) 90%
  );
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.answer-masked.revealing {
  max-height: 2000px;
}

.answer-masked.revealing::after {
  opacity: 0;
}

.answer-masked.revealed {
  max-height: none;
  overflow: visible;
}

.answer-masked.revealed::after {
  display: none;
}

/* === Premium CTA Module (index.html) === */
.premium-cta-module {
  background: linear-gradient(135deg, var(--ink) 0%, #2d2010 100%);
  border-radius: 14px;
  padding: 40px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-top: 36px;
}

.premium-cta-module::before {
  content: "\2726";
  position: absolute;
  top: 16px;
  left: 28px;
  font-size: 18px;
  color: var(--gold);
  opacity: 0.4;
}

.premium-cta-module::after {
  content: "\2726";
  position: absolute;
  top: 16px;
  right: 28px;
  font-size: 18px;
  color: var(--gold);
  opacity: 0.4;
}

.premium-cta-label {
  font-size: 22px;
  color: var(--gold-light);
  letter-spacing: 3px;
  font-variant: small-caps;
  margin-bottom: 8px;
}

.premium-cta-sub {
  font-size: 13px;
  color: #a89060;
  font-style: italic;
  margin-bottom: 10px;
}

.premium-cta-desc {
  font-size: 13px;
  color: #8a7a60;
  font-style: italic;
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

/* === Premium Cards Grid === */
.premium-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.premium-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px 20px;
  transition: border-color 0.3s, box-shadow 0.3s;
  opacity: 0;
  transform: translateY(12px);
  animation: cardFadeInPremium 0.5s ease forwards;
}

.premium-card:nth-child(1) { animation-delay: 0.05s; }
.premium-card:nth-child(2) { animation-delay: 0.1s; }
.premium-card:nth-child(3) { animation-delay: 0.15s; }
.premium-card:nth-child(4) { animation-delay: 0.2s; }
.premium-card:nth-child(5) { animation-delay: 0.25s; }

@keyframes cardFadeInPremium {
  to { opacity: 1; transform: translateY(0); }
}

.premium-card:hover {
  border-color: var(--gold);
  box-shadow: 0 4px 18px rgba(200, 150, 42, 0.10);
}

.premium-card-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 1.5px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
}

.premium-card-title::before {
  content: "";
  width: 3px;
  height: 14px;
  background: var(--gold);
  border-radius: 2px;
  display: inline-block;
}

.premium-card p {
  font-size: 13px;
  color: var(--ink-light);
  line-height: 1.85;
}

/* Premium card: last card spans full width */
.premium-card:last-child {
  grid-column: 1 / -1;
}

/* === Premium Skeleton (loading state) === */
.premium-skeleton {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px 20px;
}

.premium-skeleton-line {
  height: 12px;
  background: linear-gradient(90deg, var(--border) 25%, var(--gold-pale) 50%, var(--border) 75%);
  background-size: 200% 100%;
  border-radius: 6px;
  margin-bottom: 10px;
  animation: skeletonShimmer 1.5s ease infinite;
}

.premium-skeleton-line:first-child {
  width: 40%;
  height: 14px;
  margin-bottom: 14px;
  background: linear-gradient(90deg, var(--border) 25%, var(--gold-pale) 50%, var(--border) 75%);
  background-size: 200% 100%;
}

.premium-skeleton-line:nth-child(2) {
  width: 100%;
}

.premium-skeleton-line:nth-child(3) {
  width: 85%;
}

.premium-skeleton-line:last-child {
  width: 70%;
  margin-bottom: 0;
}

@keyframes skeletonShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* === Premium PDF Section === */
.premium-pdf-section {
  text-align: center;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* === Responsive === */
@media (max-width: 720px) {
  .payment-modal {
    padding: 28px 24px 22px;
    max-width: 360px;
  }

  .premium-cta-module {
    padding: 30px 24px;
  }

  .premium-cta-label {
    font-size: 18px;
    letter-spacing: 2px;
  }

  .premium-cards-grid {
    grid-template-columns: 1fr;
  }

  .premium-card:last-child {
    grid-column: auto;
  }
}

@media (max-width: 420px) {
  .payment-modal {
    padding: 24px 20px 20px;
    margin: 0 12px;
  }

  .payment-modal-amount {
    font-size: 28px;
  }

  .payment-modal-actions {
    flex-direction: column;
  }

  .payment-cta-btn {
    width: 100%;
    padding: 14px 20px;
    font-size: 14px;
  }

  .premium-cta-module {
    padding: 24px 18px;
  }

  .premium-cta-label {
    font-size: 16px;
  }
}