:root{--primary-color: #6a0dad;--text-light: #333;--background-color: #f9f9f9;--container-bg: #ffffff;--border-color: #e0e0e0;--error-color: #d9534f}body{background-color:var(--background-color);color:var(--text-light)}.checkout-container{width:90%;max-width:500px;margin:40px auto;padding:30px;background-color:var(--container-bg);border-radius:12px;box-shadow:0 6px 20px #00000014}.checkout-container.dark-mode{--text-light: #f0f0f0;--background-color: #121212;--container-bg: #1e1e1e;--border-color: #444;--error-color: #ff6b6b;background-color:var(--container-bg);color:var(--text-light)}.checkout-container.dark-mode h1{color:#a78bfa}.checkout-container.dark-mode #submit-button{background-color:#a78bfa}.checkout-container.dark-mode #submit-button:hover{background-color:#c4b5fd}.checkout-container h1{text-align:center;margin-bottom:25px;color:var(--primary-color)}.product-info{text-align:center;margin-bottom:30px;padding-bottom:20px;border-bottom:1px solid var(--border-color)}.product-info h2{margin:0 0 10px;font-size:1.4em}.product-info p{margin:0;font-size:1.2em;font-weight:700}#payment-form{margin-top:2rem}#card-element{padding:12px;border:1px solid var(--border-color);border-radius:8px;margin-bottom:25px;background-color:var(--background-color);min-height:46px}#submit-button{width:100%;padding:12px;background-color:var(--primary-color);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:1.1em;font-weight:600;transition:background-color .2s ease}#submit-button:hover{background-color:#8a2be2}#submit-button:disabled{background-color:#ccc;cursor:not-allowed}#error-message{margin-top:15px;color:var(--error-color);text-align:center;font-weight:500}