:root {
  --air-primary: #ff0038;
  --air-secondary: #0f172a;
  --air-bg: #f8fafc;
  --air-text: #1e293b;
  --air-muted: #64748b;
  --air-border: #e2e8f0;
  --air-card-bg: #ffffff;
  --air-btn-color: #ff0038;
  --air-btn-text: #ffffff;
  --air-btn-radius: 12px;
  --air-input-radius: 10px;
  --air-font: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --air-success: #10b981;
  --air-success-bg: #ecfdf5;
  --air-warning: #f59e0b;
  --air-warning-bg: #fffbeb;
  --air-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --air-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: var(--air-font);
  background-color: var(--air-bg);
  color: var(--air-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.air-checkout-wrapper {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 24px 16px 80px;
}

.air-container {
  width: 100%;
  max-width: 500px;
  background: var(--air-card-bg);
  border-radius: 20px;
  box-shadow: var(--air-shadow);
  border: 1px solid var(--air-border);
  overflow: hidden;
  position: relative;
}

/* Header */
.air-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--air-border);
  background: #ffffff;
}

.air-logo {
  height: 32px;
  max-width: 160px;
  object-fit: contain;
}

.air-security-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #059669;
  background: #ecfdf5;
  padding: 4px 10px;
  border-radius: 20px;
}

/* Collapsible Order Summary */
.air-order-summary-bar {
  background: #fafafa;
  border-bottom: 1px solid var(--air-border);
  padding: 14px 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}

.air-order-summary-bar:hover {
  background: #f4f4f5;
}

.air-summary-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.air-summary-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--air-secondary);
}

.air-savings-badge {
  font-size: 11px;
  font-weight: 700;
  color: #059669;
  background: #d1fae5;
  padding: 2px 8px;
  border-radius: 12px;
  margin-left: 6px;
}

.air-summary-price {
  display: flex;
  align-items: center;
  gap: 8px;
}

.air-mrp-strike {
  text-decoration: line-through;
  color: var(--air-muted);
  font-size: 13px;
}

.air-current-price {
  font-size: 16px;
  font-weight: 700;
  color: var(--air-secondary);
}

.air-chevron {
  transition: transform 0.2s ease;
  width: 18px;
  height: 18px;
  stroke: var(--air-muted);
}

.air-chevron.open {
  transform: rotate(180deg);
}

.air-summary-details {
  display: none;
  padding: 16px 20px;
  background: #ffffff;
  border-bottom: 1px solid var(--air-border);
}

.air-summary-details.active {
  display: block;
}

.air-cart-item {
  display: flex;
  gap: 14px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--air-border);
}

.air-cart-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.air-item-img {
  width: 64px;
  height: 64px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid var(--air-border);
}

.air-item-info {
  flex: 1;
}

.air-item-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--air-secondary);
}

.air-item-variant {
  font-size: 12px;
  color: var(--air-muted);
  margin-top: 2px;
}

.air-item-pricing {
  margin-top: 4px;
  font-size: 13px;
}

.air-breakdown-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-top: 8px;
  color: var(--air-muted);
}

.air-breakdown-row.total {
  font-size: 15px;
  font-weight: 700;
  color: var(--air-secondary);
  border-top: 1px solid var(--air-border);
  padding-top: 8px;
  margin-top: 12px;
}

.air-breakdown-row.discount {
  color: #059669;
  font-weight: 600;
}

/* Coupon Bar */
.air-coupon-section {
  padding: 14px 20px;
  border-bottom: 1px solid var(--air-border);
  background: #ffffff;
}

.air-coupon-form {
  display: flex;
  gap: 8px;
}

.air-coupon-input {
  flex: 1;
  padding: 10px 14px;
  font-size: 14px;
  border: 1.5px solid var(--air-border);
  border-radius: var(--air-input-radius);
  text-transform: uppercase;
  font-weight: 600;
  outline: none;
  transition: border-color 0.2s;
}

.air-coupon-input:focus {
  border-color: var(--air-primary);
}

.air-coupon-btn {
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  color: var(--air-primary);
  background: #fff0f3;
  border: 1px solid rgba(255, 0, 56, 0.2);
  border-radius: var(--air-input-radius);
  cursor: pointer;
  transition: all 0.2s;
}

.air-coupon-btn:hover {
  background: var(--air-primary);
  color: #ffffff;
}

.air-coupon-applied-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #059669;
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  padding: 4px 10px;
  border-radius: 8px;
  margin-top: 8px;
}

.air-coupon-remove {
  cursor: pointer;
  color: #ef4444;
  margin-left: 4px;
}

/* Prepaid Nudge Banner */
.air-prepaid-nudge {
  background: linear-gradient(90deg, #ecfdf5 0%, #dcfce7 100%);
  border-left: 4px solid #10b981;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 600;
  color: #065f46;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Sections */
.air-section {
  padding: 20px;
  border-bottom: 1px solid var(--air-border);
}

.air-section:last-child {
  border-bottom: none;
}

.air-section-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--air-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.air-step-indicator {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: var(--air-secondary);
  color: #ffffff;
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  margin-right: 8px;
}

/* Form Fields */
.air-field-group {
  margin-bottom: 14px;
}

.air-field-group:last-child {
  margin-bottom: 0;
}

.air-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--air-muted);
  margin-bottom: 6px;
}

.air-input-row {
  display: flex;
  gap: 10px;
}

.air-input {
  width: 100%;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--air-text);
  background: #ffffff;
  border: 1.5px solid var(--air-border);
  border-radius: var(--air-input-radius);
  outline: none;
  transition: all 0.2s;
  font-family: inherit;
}

.air-input:focus {
  border-color: var(--air-primary);
  box-shadow: 0 0 0 3px rgba(255, 0, 56, 0.1);
}

.air-input.air-phone-prefix {
  width: 75px;
  text-align: center;
  font-weight: 600;
  background: #f8fafc;
  border-right: none;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.air-phone-input {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.air-phone-container {
  display: flex;
}

/* Buttons */
.air-btn-primary {
  width: 100%;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--air-btn-text);
  background: var(--air-btn-color);
  border: none;
  border-radius: var(--air-btn-radius);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(255, 0, 56, 0.25);
}

.air-btn-primary:hover {
  filter: brightness(0.92);
}

.air-btn-primary:disabled {
  background: #cbd5e1;
  color: #94a3b8;
  box-shadow: none;
  cursor: not-allowed;
}

.air-btn-secondary {
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--air-secondary);
  background: #f1f5f9;
  border: 1px solid var(--air-border);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.air-btn-secondary:hover {
  background: #e2e8f0;
}

/* OTP Input Boxes */
.air-otp-inputs {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin: 16px 0;
}

.air-otp-digit {
  width: 50px;
  height: 52px;
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  border: 2px solid var(--air-border);
  border-radius: 12px;
  outline: none;
}

.air-otp-digit:focus {
  border-color: var(--air-primary);
  box-shadow: 0 0 0 3px rgba(255, 0, 56, 0.1);
}

.air-timer-text {
  font-size: 12px;
  color: var(--air-muted);
  text-align: center;
  margin-top: 8px;
}

.air-resend-link {
  color: var(--air-primary);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

/* Saved Address Card */
.air-saved-address-card {
  background: #f8fafc;
  border: 1.5px solid var(--air-border);
  border-radius: 14px;
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  transition: border-color 0.2s;
}

.air-saved-address-card.selected {
  border-color: var(--air-primary);
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.air-address-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--air-secondary);
}

.air-address-text {
  font-size: 13px;
  color: var(--air-text);
  margin-top: 4px;
  line-height: 1.4;
}

.air-address-contact {
  font-size: 12px;
  color: var(--air-muted);
  margin-top: 6px;
}

.air-shipping-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: #059669;
  background: #ecfdf5;
  padding: 4px 10px;
  border-radius: 8px;
  margin-top: 10px;
}

/* Payment Methods List */
.air-payment-option {
  border: 1.5px solid var(--air-border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.2s;
  background: #ffffff;
}

.air-payment-option:hover {
  border-color: #cbd5e1;
}

.air-payment-option.selected {
  border-color: var(--air-primary);
  box-shadow: 0 0 0 1px var(--air-primary);
  background: #fffdfd;
}

.air-payment-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.air-payment-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--air-secondary);
}

.air-discount-tag {
  font-size: 11px;
  font-weight: 700;
  color: #059669;
  background: #d1fae5;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 6px;
}

.air-fee-tag {
  font-size: 11px;
  font-weight: 700;
  color: #d97706;
  background: #fef3c7;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: 6px;
}

.air-payment-body {
  display: none;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--air-border);
}

.air-payment-option.selected .air-payment-body {
  display: block;
}

.air-qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 10px;
}

.air-qr-box {
  width: 140px;
  height: 140px;
  border: 1px solid var(--air-border);
  border-radius: 12px;
  padding: 6px;
  background: #ffffff;
  margin-bottom: 8px;
}

/* Sticky Bottom Bar */
.air-sticky-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 1px solid var(--air-border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.06);
  z-index: 100;
}

.air-sticky-inner {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.air-sticky-amount {
  display: flex;
  flex-direction: column;
}

.air-sticky-total {
  font-size: 18px;
  font-weight: 800;
  color: var(--air-secondary);
}

.air-sticky-tax {
  font-size: 11px;
  color: var(--air-muted);
}

/* Trust Badges */
.air-trust-footer {
  padding: 16px 20px;
  background: #fafafa;
  border-top: 1px solid var(--air-border);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
}

.air-trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--air-muted);
}

/* Alerts & Messages */
.air-alert {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 12px;
}

.air-alert.error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.air-alert.success {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

/* Responsive */
@media (max-width: 540px) {
  .air-checkout-wrapper {
    padding: 0 0 80px;
  }
  .air-container {
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}