/* ============================================================
   NexAI — 商品详情页 (SaaS Checkout 风格)
   Enterprise Grade Polish
   ============================================================ */

/* --- 面包屑 --- */
.breadcrumb {
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 68px 0 0; /* 留出导航栏空间 */
}
.breadcrumb-container {
  max-width: 1536px; margin: 0 auto;
  padding: 16px 32px;
  font-size: 0.875rem; color: var(--text-muted); font-weight: 500;
  display: flex; gap: 10px; align-items: center;
}
.breadcrumb a { transition: color 0.2s; }
.breadcrumb a:hover { color: var(--text-main); }
.breadcrumb .current { color: var(--text-main); font-weight: 600; }

/* --- 购买主区 --- */
.product-main {
  padding: 64px 32px 100px;
  background: var(--bg-page);
  min-height: calc(100vh - 120px);
}
.product-container {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1.2fr 460px; gap: 64px;
  align-items: start;
}

/* --- 左侧介绍 --- */
.product-header { display: flex; align-items: center; gap: 24px; margin-bottom: 24px; }
.vendor-tag {
  background: white; border: 1px solid var(--border);
  padding: 6px 14px; border-radius: 99px;
  font-size: 0.85rem; font-weight: 600; color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}

.product-title { font-size: 3.5rem; font-weight: 600; letter-spacing: -0.28px; margin-bottom: 16px; line-height: 1.07; }
.product-subtitle { font-size: 1.25rem; font-weight: 300; color: var(--text-muted); line-height: 1.5; margin-bottom: 48px; max-width: 600px; }

.feature-list h3 {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.25rem; font-weight: 700; margin-bottom: 24px; letter-spacing: -0.01em;
}
.feature-list h3 svg { width: 22px; height: 22px; color: var(--primary); }
.feature-list ul { display: grid; gap: 16px; }
.feature-list li {
  background: white; padding: 20px 24px; border-radius: var(--radius-lg);
  box-shadow: 0 1px 1px rgba(0,0,0,0.02), 0 2px 2px rgba(0,0,0,0.04), inset 0 0 0 1px rgba(0,0,0,0.06);
  color: var(--text-muted); font-size: 0.95rem; line-height: 1.6;
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.feature-list li:hover {
  transform: translateY(-2px); box-shadow: 0 2px 4px rgba(0,0,0,0.04), 0 8px 16px -4px rgba(0,0,0,0.08), inset 0 0 0 1px rgba(0,0,0,0.12);
}
.feature-list li strong { color: var(--text-main); display: block; margin-bottom: 6px; font-size: 1.05rem; }

.trust-box {
  margin-top: 48px; display: flex; gap: 20px;
  padding: 24px; background: linear-gradient(145deg, #F0FDF4 0%, #DCFCE7 100%);
  border: 1px solid #BBF7D0; border-radius: 20px;
  box-shadow: 0 4px 6px -1px rgba(22, 101, 52, 0.05);
}
.trust-icon svg { width: 36px; height: 36px; }
.trust-box h4 { color: #166534; margin-bottom: 6px; font-weight: 700; font-size: 1.1rem; }
.trust-box p { color: #15803D; font-size: 0.95rem; line-height: 1.6; }

/* --- 右侧控制面板 --- */
.checkout-panel { position: sticky; top: 120px; }
.panel-card {
  background: white; border-radius: 24px;
  padding: 32px;
  box-shadow: 0 1px 1px rgba(0,0,0,0.02), 0 8px 16px -4px rgba(0,0,0,0.08), 0 24px 32px -8px rgba(0,0,0,0.12), inset 0 0 0 1px rgba(0,0,0,0.06);
}

.config-group { margin-bottom: 32px; }
.config-label {
  display: flex; justify-content: space-between; align-items: center;
  font-weight: 700; font-size: 1.05rem; margin-bottom: 16px;
}
.badge-save {
  background: #ECFDF5; color: #059669;
  font-size: 0.8rem; padding: 4px 10px; border-radius: 99px; font-weight: 700;
  border: 1px solid #A7F3D0;
}

/* Radio Buttons */
.radio-grid { display: grid; gap: 12px; }
.radio-grid.cols-2 { grid-template-columns: 1fr 1fr; }
.radio-btn {
  text-align: left; padding: 16px; border: 2px solid var(--border);
  border-radius: 16px; transition: all 0.25s var(--ease-out); position: relative;
  background: white;
}
.radio-btn:hover { border-color: #CBD5E1; background: var(--bg-page); transform: translateY(-1px); }
.radio-btn.active {
  border-color: transparent; background: white;
  box-shadow: 0 0 0 2px var(--primary), 0 0 0 5px rgba(0, 102, 204, 0.15);
}
.radio-title { display: block; font-weight: 700; color: var(--text-main); margin-bottom: 6px; font-size: 1rem; }
.radio-price { display: block; color: var(--text-muted); font-size: 0.95rem; font-weight: 500; font-variant-numeric: tabular-nums; }
.radio-desc { display: block; color: var(--text-light); font-size: 0.8rem; line-height: 1.4; }
.tag-hot {
  background: #FEF2F2; color: #E11D48; border: 1px solid #FECDD3;
  font-size: 0.75rem; padding: 2px 8px; border-radius: 6px; margin-left: 6px; font-weight: 700;
}

/* Checkboxes */
.checkbox-list { display: grid; gap: 12px; }
.checkbox-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 16px; border: 1px solid var(--border); border-radius: 16px;
  cursor: pointer; transition: all 0.25s var(--ease-out);
  background: white;
}
.checkbox-item:hover { background: var(--bg-hover); border-color: #CBD5E1; }
.checkbox-item input[type="checkbox"] {
  width: 1.4rem; height: 1.4rem; margin-top: 2px;
  accent-color: var(--primary); cursor: pointer;
}
.checkbox-content { flex-grow: 1; }
.checkbox-title { display: block; font-weight: 600; font-size: 1rem; margin-bottom: 4px; color: var(--text-main); }
.checkbox-desc { display: block; font-size: 0.85rem; color: var(--text-muted); }
.checkbox-price { font-weight: 700; font-size: 0.95rem; color: var(--text-main); font-variant-numeric: tabular-nums; }

.divider { border: none; height: 1px; background: var(--border); margin: 32px 0; }

/* 价格汇总 */
.price-summary { margin-bottom: 32px; }
.summary-row {
  display: flex; justify-content: space-between;
  color: var(--text-muted); font-size: 1rem; margin-bottom: 12px; font-weight: 500;
}
.summary-total {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 24px; padding-top: 24px; border-top: 1px dashed var(--border);
  font-weight: 700; font-size: 1.25rem;
}
.total-amount { color: var(--text-main); display: flex; align-items: baseline; gap: 4px; font-variant-numeric: tabular-nums; }
.total-amount .currency { font-size: 1.4rem; }
.total-amount #totalPrice { font-size: 3rem; font-weight: 800; letter-spacing: -0.03em; }

.btn-checkout { 
  padding: 18px; font-size: 1.15rem; border-radius: var(--radius-pill); 
  transition: all 0.2s var(--ease-out);
}
.btn-checkout:hover { transform: scale(0.98); }
.btn-checkout:active { transform: scale(0.95); }

.secure-text {
  display: flex; justify-content: center; align-items: center; gap: 8px;
  margin-top: 16px; font-size: 0.85rem; color: var(--text-light); font-weight: 500;
}
.secure-text svg { width: 18px; height: 18px; color: #10B981; }

/* 响应式 */
@media (max-width: 1024px) {
  .product-container { grid-template-columns: 1fr; gap: 48px; }
  .checkout-panel { position: static; max-width: 600px; margin: 0 auto; width: 100%; }
  .product-title { font-size: 2.75rem; }
  .product-main { padding-top: 40px; padding-bottom: 60px; }
}
@media (max-width: 640px) {
  .breadcrumb { padding-top: 58px; }
  .breadcrumb-container {
    padding: 12px 16px;
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: none;
  }
  .breadcrumb-container::-webkit-scrollbar { display: none; }
  .product-header { flex-direction: column; align-items: flex-start; gap: 14px; margin-bottom: 18px; }
  .product-main { padding: 22px 12px 28px; }
  .product-container { gap: 28px; }
  .product-title {
    font-size: clamp(2rem, 10vw, 2.55rem);
    line-height: 1.05;
    margin-bottom: 12px;
    letter-spacing: 0;
  }
  .product-subtitle {
    font-size: 1rem;
    line-height: 1.55;
    margin-bottom: 28px;
  }
  .vendor-tag { font-size: 0.78rem; padding: 5px 11px; }
  .feature-list h3 { font-size: 1.08rem; margin-bottom: 14px; }
  .feature-list ul { gap: 10px; }
  .feature-list li {
    padding: 15px 16px;
    border-radius: 15px;
    font-size: 0.9rem;
  }
  .feature-list li:hover { transform: none; }
  .feature-list li strong { font-size: 0.98rem; margin-bottom: 3px; }
  .trust-box {
    margin-top: 24px;
    padding: 16px;
    gap: 12px;
    border-radius: 16px;
  }
  .trust-icon svg { width: 28px; height: 28px; }
  .trust-box h4 { font-size: 1rem; }
  .trust-box p { font-size: 0.88rem; }
  .checkout-panel { max-width: none; }
  .panel-card {
    padding: 18px;
    border-radius: 20px;
    box-shadow: 0 1px 1px rgba(0,0,0,0.02), 0 10px 24px -14px rgba(0,0,0,0.22), inset 0 0 0 1px rgba(0,0,0,0.06);
  }
  .config-group { margin-bottom: 22px; }
  .config-label { font-size: 0.98rem; margin-bottom: 12px; align-items: flex-start; gap: 10px; }
  .badge-save { font-size: 0.72rem; padding: 3px 8px; white-space: nowrap; }
  .radio-grid.cols-2, .radio-grid.cols-3 { grid-template-columns: 1fr; }
  .radio-grid { gap: 9px; }
  .radio-btn { padding: 13px 14px; border-radius: 14px; }
  .radio-btn:hover { transform: none; }
  .radio-title { font-size: 0.94rem; margin-bottom: 4px; }
  .radio-price { font-size: 0.88rem; }
  .radio-desc { font-size: 0.76rem; }
  .checkbox-list { gap: 9px; }
  .checkbox-item { padding: 13px; gap: 12px; border-radius: 14px; }
  .checkbox-item input[type="checkbox"] { width: 1.2rem; height: 1.2rem; }
  .checkbox-title { font-size: 0.92rem; }
  .checkbox-desc { font-size: 0.78rem; }
  .checkbox-price { font-size: 0.88rem; }
  .divider { margin: 22px 0; }
  .price-summary { margin-bottom: 18px; }
  .summary-row { font-size: 0.92rem; margin-bottom: 9px; }
  .summary-total { margin-top: 18px; padding-top: 18px; font-size: 1.08rem; }
  .total-amount .currency { font-size: 1.1rem; }
  .total-amount #totalPrice { font-size: 2.3rem; }
  .btn-checkout {
    min-height: 52px;
    padding: 15px;
    font-size: 1rem;
    position: sticky;
    bottom: max(12px, env(safe-area-inset-bottom));
    z-index: 20;
    box-shadow: 0 10px 26px -12px rgba(0, 102, 204, 0.65);
  }
  .secure-text { font-size: 0.78rem; margin-top: 12px; }
  .success-content { padding: 32px 24px; }
  .success-footer { flex-direction: column; }
}

@media (max-width: 390px) {
  .product-main { padding-inline: 10px; }
  .panel-card { padding: 16px; }
  .checkbox-item { align-items: flex-start; }
  .total-amount #totalPrice { font-size: 2.05rem; }
}

/* --- Success Overlay --- */
.success-overlay {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(245, 245, 247, 0.85); /* Apple light blur */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: all 0.4s var(--ease-out);
}
.success-overlay.open { opacity: 1; visibility: visible; }
.success-content {
  background: white;
  padding: 48px;
  border-radius: 28px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.05), inset 0 0 0 1px rgba(0,0,0,0.04);
  text-align: center;
  transform: scale(0.9) translateY(10px);
  transition: all 0.5s var(--ease-spring);
  max-width: 420px;
  width: 90%;
}
.success-overlay.open .success-content { transform: scale(1) translateY(0); }
.success-icon {
  width: 72px; height: 72px;
  background: #34C759; /* Apple Green */
  color: white;
  border-radius: 50%; display: grid; place-items: center;
  margin: 0 auto 24px;
  box-shadow: 0 8px 16px rgba(52, 199, 89, 0.25);
  animation: pop-in 0.6s var(--ease-spring) backwards;
}
.success-icon svg { width: 32px; height: 32px; }
.success-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 12px; color: var(--text-main); letter-spacing: -0.4px; }
.success-desc { font-size: 0.95rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 32px;}
.success-footer { display: flex; gap: 12px; justify-content: center; }

@keyframes pop-in {
  0% { transform: scale(0.5); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}