@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary-color: #10b981;
  --primary-hover: #047857;
  --text-main: #1f2937;
  --text-muted: #6b7280;
  --bg-body: #f3f4f6;
  --bg-card: #ffffff;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.checkout-container {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 20px;
}

.header {
  text-align: center;
  margin-bottom: 40px;
}

.header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.header p {
  color: var(--text-muted);
}

.checkout-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 30px;
  align-items: start;
}

/* CARDS */
.card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 30px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.card h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--border-color);
}

/* FORM ELEMENTS */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: 'Inter', sans-serif;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: #f9fafb;
  transition: all 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  background-color: #fff;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* RADIO BUTTONS (Payment Methods) */
.payment-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.radio-card {
  display: flex;
  align-items: center;
  padding: 16px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  background-color: #f9fafb;
}

.radio-card:hover {
  border-color: #d1d5db;
}

.radio-card input[type="radio"] {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid #d1d5db;
  border-radius: 50%;
  margin-right: 12px;
  position: relative;
  outline: none;
  cursor: pointer;
}

.radio-card input[type="radio"]:checked {
  border-color: var(--primary-color);
}

.radio-card input[type="radio"]:checked::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  background-color: var(--primary-color);
  border-radius: 50%;
}

.radio-card input[type="radio"]:checked + .radio-content {
  color: var(--text-main);
}

.radio-content {
  flex-grow: 1;
}

.radio-title {
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 2px;
  color: var(--text-main);
}

.radio-desc {
  font-size: 13px;
  color: var(--text-muted);
}

/* COUPON SECTION */
.coupon-wrapper {
  display: flex;
  gap: 10px;
}

.coupon-input {
  flex-grow: 1;
  text-transform: uppercase;
}

.btn-apply {
  padding: 0 20px;
  background-color: #f3f4f6;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-apply:hover {
  background-color: #e5e7eb;
}

.btn-apply:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.coupon-msg {
  font-size: 13px;
  margin-top: 8px;
  font-weight: 500;
}
.coupon-msg.success { color: var(--primary-color); }
.coupon-msg.error { color: #ef4444; }

/* SUMMARY CARD */
.summary-card {
  position: sticky;
  top: 40px;
  box-shadow: var(--shadow-md);
}

.product-info {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 20px;
}

.product-icon {
  width: 50px;
  height: 50px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--primary-color);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-details h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
}

.product-details p {
  font-size: 13px;
  color: var(--text-muted);
}

.price-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--text-muted);
}

.price-row.discount {
  color: var(--primary-color);
  font-weight: 500;
}

.price-row.discount-coupon {
  color: #ef4444;
  font-weight: 500;
  display: none; /* hidden by default */
}

.divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 15px 0;
}

.total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.total-label {
  font-size: 16px;
  font-weight: 600;
}

.total-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
}

.total-price-strike {
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: line-through;
  display: block;
  text-align: right;
}

.btn-primary {
  width: 100%;
  padding: 16px;
  background-color: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-primary:disabled {
  background-color: #9ca3af;
  cursor: not-allowed;
  box-shadow: none;
}

.secure-badge {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.response-log {
  margin-top: 20px;
  padding: 10px 0;
  font-size: 14px;
  font-weight: 500;
  white-space: pre-wrap;
  display: none;
  text-align: center;
}

@media (max-width: 768px) {
  .checkout-grid {
    grid-template-columns: 1fr;
  }
  
  .summary-card {
    position: static;
    order: -1; /* Pindahkan summary ke atas di mobile */
  }
}