.checkout-container{max-width:1000px;margin:0 auto;background:radial-gradient(at 20% 20%,rgba(102,126,234,0.5) 0%,transparent 50%),radial-gradient(at 80% 20%,rgba(118,75,162,0.45) 0%,transparent 50%),radial-gradient(at 50% 80%,rgba(240,147,251,0.4) 0%,transparent 50%),radial-gradient(at 10% 60%,rgba(195,207,226,0.6) 0%,transparent 40%),radial-gradient(at 90% 60%,rgba(228,232,237,0.7) 0%,transparent 40%),#F5F7FA;border-radius:12px;box-shadow:0 4px 20px rgba(0,0,0,0.1);padding:30px}body.dark-theme .checkout-container{background:radial-gradient(at 20% 20%,rgba(51,63,117,0.5) 0%,transparent 50%),radial-gradient(at 80% 20%,rgba(59,38,81,0.45) 0%,transparent 50%),radial-gradient(at 50% 80%,rgba(120,74,126,0.4) 0%,transparent 50%),radial-gradient(at 10% 60%,rgba(98,104,113,0.6) 0%,transparent 40%),radial-gradient(at 90% 60%,rgba(114,116,119,0.7) 0%,transparent 40%),#1a1a2e}.checkout-header{text-align:center;margin-bottom:30px}.checkout-header h1{color:var(--primary-color);margin-bottom:10px}.checkout-steps{display:flex;justify-content:space-between;margin-bottom:30px;position:relative}.checkout-steps::before{content:'';position:absolute;top:20px;left:0;right:0;height:2px;background-color:var(--border-color);z-index:1}.step{display:flex;flex-direction:column;align-items:center;position:relative;z-index:2}.step-number{width:40px;height:40px;border-radius:50%;background-color:var(--border-color);color:var(--text-color);display:flex;justify-content:center;align-items:center;margin-bottom:10px;font-weight:bold}.step.active .step-number{background-color:var(--primary-color);color:white}.step.completed .step-number{background-color:var(--success-color);color:white}.step-label{font-size:14px;text-align:center}.checkout-form{margin-bottom:30px}.form-section{display:none;animation:fadeIn 0.5s}.form-section.active{display:block}.checkout-summary{background-color:rgba(33,150,243,0.1);border-radius:8px;padding:20px;margin-bottom:30px}.summary-item{display:flex;justify-content:space-between;margin-bottom:10px}.summary-total{font-weight:bold;font-size:18px;border-top:1px solid var(--border-color);padding-top:10px;margin-top:10px}#card-element{padding:12px;border:1px solid var(--border-color);border-radius:6px;background-color:var(--card-background)}.navigation-buttons{display:flex;justify-content:space-between;margin-top:30px}.success-message{text-align:center;padding:30px;display:none}.success-icon{font-size:60px;color:var(--success-color);margin-bottom:20px}.download-button{display:inline-block;margin-top:20px;padding:12px 30px;background-color:var(--success-color);color:white;text-decoration:none;border-radius:6px;font-weight:bold}.buy .buy-button{min-width:140px;text-wrap:nowrap}