:root{--stripe-purple: #635BFF;--stripe-purple-hover: #5851DF;--stripe-purple-light: #E8F0FE;--gray-900: #1A1F36;--gray-800: #32325D;--gray-600: #525F7F;--gray-500: #8898AA;--gray-400: #AAB7C4;--gray-300: #E3E8EE;--gray-200: #F0F3F8;--gray-100: #F7F9FC;--white: #FFFFFF;--red: #E25950;--green: #10B981;--border-radius: 6px;--shadow-sm: 0 2px 4px rgba(50, 50, 93, .06);--shadow-md: 0 4px 12px rgba(50, 50, 93, .08);--shadow-lg: 0 8px 24px rgba(50, 50, 93, .12);--transition: all .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.5;color:var(--gray-800);background:var(--gray-100);min-height:100vh}#app{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}.checkout-container{display:grid;grid-template-columns:1fr;max-width:900px;width:100%;background:var(--white);border-radius:12px;box-shadow:var(--shadow-lg);overflow:hidden}@media (min-width: 768px){.checkout-container{grid-template-columns:1fr 1.2fr}}.order-summary{background:var(--gray-100);padding:32px;border-right:1px solid var(--gray-300)}@media (max-width: 767px){.order-summary{border-right:none;border-bottom:1px solid var(--gray-300)}}.product-selector{display:flex;flex-direction:column;gap:12px}.product-option{display:flex;align-items:flex-start;gap:12px;padding:16px;background:var(--white);border:2px solid var(--gray-300);border-radius:var(--border-radius);cursor:pointer;transition:var(--transition)}.product-option:hover{border-color:var(--gray-400)}.product-option.selected{border-color:var(--stripe-purple);background:var(--stripe-purple-light)}.product-radio{width:20px;height:20px;border:2px solid var(--gray-400);border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}.product-option.selected .product-radio{border-color:var(--stripe-purple)}.radio-inner{width:10px;height:10px;border-radius:50%;background:var(--stripe-purple);transform:scale(0);transition:var(--transition)}.product-option.selected .radio-inner{transform:scale(1)}.product-info{flex:1;min-width:0}.product-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}.product-header .product-name{font-size:15px;font-weight:600;color:var(--gray-900);margin-bottom:0}.product-header .product-price{font-size:15px;font-weight:600;color:var(--stripe-purple)}.product-description{font-size:13px;color:var(--gray-600)}.summary-title{font-size:18px;font-weight:600;color:var(--gray-900);margin-bottom:24px}.divider{height:1px;background:var(--gray-300);margin:20px 0}.summary-row{display:flex;justify-content:space-between;align-items:center;font-size:14px;color:var(--gray-600);margin-bottom:12px}.summary-row.total{font-size:16px;font-weight:600;color:var(--gray-900);margin-top:16px;padding-top:16px;border-top:1px solid var(--gray-300)}.test-card-notice{display:flex;align-items:center;gap:8px;margin-top:24px;padding:12px;background:var(--stripe-purple-light);border-radius:var(--border-radius);font-size:12px;color:var(--stripe-purple)}.test-card-notice svg{width:16px;height:16px;flex-shrink:0}.payment-form{padding:32px}.form-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.form-title{font-size:18px;font-weight:600;color:var(--gray-900)}.lock-icon{display:flex;align-items:center;justify-content:center;width:32px;height:32px;color:var(--gray-600)}.lock-icon svg{width:20px;height:20px}.form-group{margin-bottom:20px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}label{display:block;font-size:14px;font-weight:500;color:var(--gray-800);margin-bottom:6px}input[type=email],input[type=text]{width:100%;height:44px;padding:0 14px;font-size:16px;color:var(--gray-900);background:var(--white);border:1px solid var(--gray-400);border-radius:var(--border-radius);transition:var(--transition)}input::placeholder{color:var(--gray-400)}input:focus{outline:none;border-color:var(--stripe-purple);box-shadow:0 0 0 3px var(--stripe-purple-light)}input.error{border-color:var(--red)}input.error:focus{box-shadow:0 0 0 3px #e259501a}.card-input-wrapper{position:relative}.card-input-wrapper input{padding-right:80px}.card-icons{position:absolute;right:12px;top:50%;transform:translateY(-50%);display:flex;gap:6px}.card-icon{width:24px;height:16px}.error-message{font-size:12px;color:var(--red);margin-top:6px;min-height:18px}.pay-button{width:100%;height:48px;display:flex;align-items:center;justify-content:center;gap:8px;font-size:16px;font-weight:600;color:var(--white);background:var(--stripe-purple);border:none;border-radius:var(--border-radius);cursor:pointer;transition:var(--transition);position:relative}.pay-button:hover:not(:disabled){background:var(--stripe-purple-hover)}.pay-button:active:not(:disabled){transform:translateY(1px)}.pay-button:disabled{opacity:.7;cursor:not-allowed}.pay-button.loading .button-text,.pay-button .button-loading{display:none}.pay-button.loading .button-loading{display:flex}.pay-button.hidden{display:none}.spinner{width:24px;height:24px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.payment-success{display:none;flex-direction:column;align-items:center;gap:12px;padding:32px;text-align:center}.payment-success.show{display:flex}.payment-success svg{width:48px;height:48px}.payment-success span{font-size:18px;font-weight:600;color:var(--green)}.alert{padding:12px 16px;border-radius:var(--border-radius);font-size:14px;margin-bottom:20px}.alert-error{background:#e259501a;color:var(--red);border:1px solid rgba(226,89,80,.3)}.payment-form{position:relative}.order-summary{background-image:radial-gradient(circle at 20% 80%,rgba(99,91,255,.05) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(99,91,255,.05) 0%,transparent 50%)}input:focus-visible{outline:2px solid var(--stripe-purple);outline-offset:2px}.pay-button:focus-visible{outline:2px solid var(--stripe-purple);outline-offset:2px}@media (max-width: 480px){.checkout-container{border-radius:0}.order-summary,.payment-form{padding:24px 20px}.form-row{grid-template-columns:1fr;gap:0}}