.wpc-calc-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, #b8960c 0%, #d4af37 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 12px 0;
}
.wpc-calc-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(184,150,12,0.4); }
.wpc-calc-btn svg { width: 20px; height: 20px; fill: currentColor; }
.wpc-calc-panel {
  display: none;
  background: #f8f7f4;
  border: 2px solid #e8e4da;
  border-radius: 16px;
  padding: 24px;
  margin: 16px 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
.wpc-calc-panel.open { display: block; animation: wpcCalcSlide 0.25s ease-out; }
@keyframes wpcCalcSlide { from { opacity:0; transform:translateY(-8px); } to { opacity:1; transform:translateY(0); } }
.wpc-calc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.wpc-calc-close { background:none; border:none; font-size:1.4rem; cursor:pointer; color:#999; padding:4px 8px; }
.wpc-calc-close:hover { color:#333; }
.wpc-calc-input-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.wpc-calc-input-label { font-size: 14px; font-weight: 600; color: #333; white-space: nowrap; }
.wpc-calc-m2-input {
  width: 100px;
  padding: 10px 14px;
  border: 2px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  outline: none;
  transition: border-color 0.2s;
}
.wpc-calc-m2-input:focus { border-color: #b8960c; }
.wpc-calc-m2-unit { font-size: 14px; color: #666; }
.wpc-calc-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-bottom: 16px;
}
.wpc-calc-table th {
  text-align: left;
  padding: 8px 12px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #888;
  border-bottom: 2px solid #e8e4da;
}
.wpc-calc-table td {
  padding: 10px 12px;
  border-bottom: 1px solid #eee;
  font-size: 14px;
  color: #333;
}
.wpc-calc-table tr.optional td { opacity: 0.6; }
.wpc-calc-table tr.optional.included td { opacity: 1; }
.wpc-calc-comp-name { font-weight: 600; }
.wpc-calc-rec { color: #888; font-size: 13px; }
.wpc-calc-qty-input {
  width: 70px;
  padding: 6px 8px;
  border: 1.5px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  outline: none;
}
.wpc-calc-qty-input:focus { border-color: #b8960c; }
.wpc-calc-price { font-weight: 600; text-align: right; white-space: nowrap; }
.wpc-calc-total-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0 8px;
  border-top: 2px solid #e8e4da;
}
.wpc-calc-total-label { font-size: 16px; font-weight: 700; color: #1a1a2e; }
.wpc-calc-total-price { font-size: 22px; font-weight: 800; color: #b8960c; }
.wpc-calc-add-btn {
  display: block;
  width: 100%;
  padding: 14px;
  background: #1a1a2e;
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 8px;
}
.wpc-calc-add-btn:hover { background: #2a2a3e; }
.wpc-calc-add-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.wpc-calc-success {
  display: none;
  text-align: center;
  padding: 20px;
  color: #16a34a;
  font-weight: 600;
}
.wpc-calc-opt-toggle {
  cursor: pointer;
  background: none;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 11px;
  color: #666;
}
/* Tablet */
@media (max-width: 1024px) {
  .wpc-calc-panel { padding: 20px; }
}
/* Mobile */
@media (max-width: 768px) {
  .wpc-calc-panel { padding: 16px; margin: 12px 0; }
  .wpc-calc-btn { width: 100%; justify-content: center; padding: 14px 20px; }
  .wpc-calc-table th:nth-child(2), .wpc-calc-table td:nth-child(2) { display: none; }
  .wpc-calc-m2-input { width: 90px; font-size: 18px; padding: 12px; }
  .wpc-calc-qty-input { width: 64px; padding: 10px 6px; font-size: 16px; min-height: 44px; }
  .wpc-calc-opt-toggle { padding: 6px 12px; font-size: 12px; min-height: 36px; }
  .wpc-calc-add-btn { padding: 16px; font-size: 16px; min-height: 50px; }
  .wpc-calc-close { font-size: 1.6rem; padding: 8px 12px; min-width: 44px; min-height: 44px; }
  .wpc-calc-table td { padding: 10px 8px; }
  .wpc-calc-table th { padding: 8px; }
  .wpc-calc-total-price { font-size: 20px; }
}