.checkout-section {
  min-height: 100vh;
  padding: 120px 20px 80px;
  background: var(--bg-darker);
}

.checkout-container {
  max-width: 1000px;
  margin: 0 auto;
}

.checkout-header {
  text-align: center;
  margin-bottom: 50px;
}

.checkout-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.checkout-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.checkout-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 40px;
}

.checkout-form-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 35px;
}

.form-section {
  margin-bottom: 35px;
}

.form-section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
}

.form-section h3 i {
  color: var(--primary-color);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  background: rgba(15, 15, 35, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.2);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.form-group select option {
  background: var(--bg-dark);
  color: var(--text-primary);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.payment-methods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.payment-option {
  cursor: pointer;
}

.payment-option input {
  display: none;
}

.payment-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 20px;
  background: rgba(15, 15, 35, 0.6);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.payment-card i {
  font-size: 1.5rem;
  color: var(--text-secondary);
}

.payment-card span {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.payment-option input:checked + .payment-card {
  border-color: var(--primary-color);
  background: rgba(108, 92, 231, 0.1);
}

.payment-option input:checked + .payment-card i,
.payment-option input:checked + .payment-card span {
  color: var(--primary-color);
}

.checkout-btn {
  width: 100%;
  padding: 16px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 12px;
  color: white;
  font-size: 1.1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(108, 92, 231, 0.4);
}

.checkout-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(108, 92, 231, 0.6);
}

.checkout-summary {
  position: sticky;
  top: 100px;
}

.summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 30px;
}

.summary-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 25px;
  color: var(--text-primary);
}

.summary-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  font-size: 0.95rem;
}

.summary-item span:first-child {
  color: var(--text-secondary);
}

.summary-item span:last-child {
  font-weight: 500;
  color: var(--text-primary);
}

.summary-item.discount span:last-child {
  color: var(--success-color);
}

.summary-divider {
  height: 1px;
  background: var(--border-color);
  margin: 10px 0;
}

.summary-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 0;
  font-size: 1.1rem;
}

.summary-total span:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

.summary-total span:last-child {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.summary-security {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 25px;
  padding: 15px;
  background: rgba(0, 184, 148, 0.1);
  border: 1px solid rgba(0, 184, 148, 0.2);
  border-radius: 12px;
  font-size: 0.85rem;
  color: var(--success-color);
}

.summary-security i {
  font-size: 1.2rem;
}

.affiliate-section {
  margin-bottom: 25px;
}

.affiliate-box {
  background: rgba(15, 15, 35, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
}

.affiliate-input-group {
  display: flex;
  gap: 12px;
}

.affiliate-input-group input {
  flex: 1;
  padding: 14px 16px;
  background: rgba(10, 10, 25, 0.8);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.affiliate-input-group input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.2);
}

.affiliate-input-group input::placeholder {
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: normal;
}

.apply-affiliate-btn {
  padding: 14px 24px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 10px;
  color: white;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.apply-affiliate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(108, 92, 231, 0.4);
}

.apply-affiliate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.affiliate-status {
  margin-top: 12px;
  padding: 0;
  font-size: 0.9rem;
  display: none;
}

.affiliate-status.show {
  display: block;
  padding: 12px 16px;
  border-radius: 8px;
}

.affiliate-status.success {
  background: rgba(0, 184, 148, 0.15);
  border: 1px solid rgba(0, 184, 148, 0.3);
  color: #00b894;
}

.affiliate-status.error {
  background: rgba(231, 76, 60, 0.15);
  border: 1px solid rgba(231, 76, 60, 0.3);
  color: #e74c3c;
}

.affiliate-status.info {
  background: rgba(108, 92, 231, 0.15);
  border: 1px solid rgba(108, 92, 231, 0.3);
  color: #a29bfe;
}

.affiliate-status i {
  margin-right: 8px;
}

@media (max-width: 900px) {
  .checkout-section {
    padding: 100px 15px 60px;
  }

  .checkout-header {
    margin-bottom: 30px;
  }

  .checkout-header h1 {
    font-size: 1.8rem;
  }

  .checkout-header p {
    font-size: 0.95rem;
  }

  .checkout-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .checkout-summary {
    position: static;
    order: -1;
  }

  .checkout-form-container {
    padding: 20px;
    border-radius: 16px;
  }

  .form-section {
    margin-bottom: 25px;
  }

  .form-section h3 {
    font-size: 1.05rem;
    margin-bottom: 15px;
  }

  .form-group {
    margin-bottom: 15px;
  }

  .form-group input,
  .form-group select {
    padding: 12px 14px;
    font-size: 0.95rem;
    border-radius: 10px;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 15px;
  }

  .payment-methods {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .payment-card {
    padding: 12px 8px;
    gap: 6px;
  }

  .payment-card i {
    font-size: 1.2rem;
  }

  .payment-card span {
    font-size: 0.75rem;
  }

  .checkout-btn {
    padding: 14px;
    font-size: 1rem;
    border-radius: 10px;
  }

  .summary-card {
    padding: 20px;
    border-radius: 16px;
  }

  .summary-card h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
  }

  .summary-item {
    padding: 10px 0;
    font-size: 0.85rem;
    flex-wrap: wrap;
    gap: 5px;
  }

  .summary-item span:last-child {
    max-width: 60%;
    text-align: right;
    word-break: break-word;
    font-size: 0.85rem;
  }

  .summary-total {
    padding: 12px 0;
    font-size: 1rem;
  }

  .summary-total span:last-child {
    font-size: 1.3rem;
  }

  .summary-security {
    padding: 12px;
    font-size: 0.8rem;
    gap: 8px;
    margin-top: 15px;
  }

  .summary-security i {
    font-size: 1rem;
  }

  .affiliate-box {
    padding: 15px;
  }

  .affiliate-input-group {
    flex-direction: column;
    gap: 10px;
  }

  .affiliate-input-group input {
    padding: 12px 14px;
    font-size: 0.95rem;
  }

  .apply-affiliate-btn {
    padding: 12px 20px;
    font-size: 0.9rem;
    justify-content: center;
    width: 100%;
  }

  .affiliate-status {
    font-size: 0.85rem;
  }

  .affiliate-status.show {
    padding: 10px 14px;
  }
}

@media (max-width: 480px) {
  .checkout-section {
    padding: 90px 12px 50px;
  }

  .checkout-header h1 {
    font-size: 1.5rem;
  }

  .checkout-header p {
    font-size: 0.9rem;
  }

  .checkout-form-container {
    padding: 16px;
  }

  .form-section h3 {
    font-size: 1rem;
  }

  .form-group input,
  .form-group select {
    padding: 11px 12px;
    font-size: 0.9rem;
  }

  .payment-methods {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .payment-card {
    padding: 10px 6px;
    gap: 4px;
  }

  .payment-card i {
    font-size: 1rem;
  }

  .payment-card span {
    font-size: 0.7rem;
  }

  .summary-card {
    padding: 16px;
  }

  .summary-item {
    font-size: 0.8rem;
  }

  .summary-item span:last-child {
    font-size: 0.8rem;
  }

  .summary-total span:last-child {
    font-size: 1.2rem;
  }

  .checkout-btn {
    padding: 13px;
    font-size: 0.95rem;
  }
}