:root{--academic-blue: #1a365d;--academic-blue-dark: #2c5282;--academic-blue-light: #ebf8ff;--cream-white: #FFFBF5;--pure-white: #FFFFFF;--ink-black: #1A1A1A;--charcoal: #2D3436;--text-gray: #636E72;--light-gray: #DFE6DF}.payment-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;width:100%;height:100%;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.payment-modal{background:#fff;border-radius:16px;box-shadow:0 30px 60px #0000004d;width:420px;max-width:90vw;max-height:90vh;overflow-y:auto;position:relative;padding:40px}.payment-modal-close{position:absolute;top:16px;right:16px;font-size:24px;color:var(--text-gray);cursor:pointer;transition:.2s ease;border:none;background:none;line-height:1}.payment-modal-close:hover{color:var(--charcoal)}.payment-modal-header{text-align:center;padding-bottom:24px;border-bottom:1px solid var(--light-gray)}.payment-modal-icon{font-size:40px;display:block;margin-bottom:12px}.payment-modal-title{font-size:20px;font-weight:700;color:var(--ink-black);margin-bottom:12px}.payment-modal-price{margin-bottom:16px}.payment-modal-price .amount{font-size:32px;font-weight:700;color:var(--academic-blue)}.payment-modal-price .period{font-size:14px;color:var(--text-gray)}.payment-modal-features{list-style:none;padding:0;margin:0;text-align:left}.payment-modal-features li{padding:6px 0;font-size:14px;color:var(--charcoal)}.payment-modal-body{padding-top:24px}.payment-modal-loading,.payment-modal-polling{display:flex;flex-direction:column;align-items:center;padding:30px 0}.payment-modal-polling{padding:16px 0 0}.payment-modal-polling p{font-size:13px;color:var(--text-gray);margin:8px 0 0}.payment-spinner{width:36px;height:36px;border:3px solid var(--light-gray);border-top-color:var(--academic-blue);border-radius:50%;animation:payment-spin .8s linear infinite;margin-bottom:12px}.payment-spinner.small{width:20px;height:20px;border-width:2px;margin-bottom:0}@keyframes payment-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.payment-modal-success{text-align:center;padding:30px 0}.payment-success-icon{display:inline-block;width:56px;height:56px;line-height:56px;font-size:28px;font-weight:700;color:#fff;background:#27ae60;border-radius:50%;margin-bottom:16px}.payment-modal-success h3{color:#27ae60;font-size:20px;margin:0 0 8px}.payment-modal-success p{color:var(--text-gray);font-size:14px;margin:0 0 20px}.payment-modal-error{text-align:center;padding:20px 0}.payment-error-text{color:#e74348;font-size:14px;margin-bottom:16px}.payment-modal-btn{display:inline-block;padding:12px 32px;background:var(--academic-blue);color:#fff;border:none;border-radius:8px;font-size:15px;font-weight:500;cursor:pointer;transition:.2s ease;text-decoration:none}.payment-modal-btn:hover{background:var(--academic-blue-dark)}.payment-modal-btn.primary{display:block;width:100%;padding:14px 32px;font-size:16px;margin-bottom:16px}.payment-cancel-btn{display:block;width:100%;margin-top:16px;padding:10px 24px;background:none;border:1px solid var(--light-gray);color:var(--text-gray);border-radius:8px;font-size:14px;cursor:pointer;transition:.2s ease;text-align:center}.payment-cancel-btn:hover{border-color:var(--text-gray);color:var(--charcoal)}.payment-modal-devpay{text-align:center;padding:20px;background:#fff3e6;border-radius:8px}.payment-dev-hint{font-size:13px;color:var(--text-gray);margin:0 0 8px}.payment-dev-order{font-size:12px;color:var(--text-gray);margin:0 0 16px;font-family:monospace}.payment-modal-payurl{text-align:center;padding:20px 0}.payment-pay-hint{font-size:15px;color:var(--charcoal);font-weight:500;margin:0 0 16px}.payment-order-info{font-size:12px;color:var(--text-gray);margin:0 0 16px}.payment-or-hint{font-size:13px;color:var(--text-gray);margin:12px 0}.payment-modal-paypal{text-align:center;padding:10px 0}.paypal-button-container{margin:16px 0;min-height:48px}.payment-alternative{margin-top:20px;padding-top:20px;border-top:1px solid var(--light-gray)}.payment-alternative-text{font-size:13px;color:var(--text-gray);margin:0 0 12px}.payment-alternative-btn{display:inline-block;padding:10px 24px;background:#fff;color:var(--academic-blue);border:1px solid var(--academic-blue);border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:.2s ease}.payment-alternative-btn:hover{background:var(--academic-blue-light)}.payment-error-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.payment-modal-btn.secondary{background:#fff;color:var(--academic-blue);border:1px solid var(--academic-blue)}.payment-modal-btn.secondary:hover{background:var(--academic-blue-light)}.backdoor-price{color:#e74c3c}.backdoor-original-price{font-size:16px;color:var(--text-gray);text-decoration:line-through;font-weight:400;margin-left:4px}.backdoor-badge{display:inline-block;font-size:11px;background:#e74c3c;color:#fff;padding:2px 8px;border-radius:10px;margin-left:8px;vertical-align:middle;font-weight:500}.backdoor-code-input{display:flex;gap:8px;justify-content:center;margin-top:10px;margin-bottom:10px}.backdoor-code-input input{padding:6px 12px;border:1px solid var(--light-gray);border-radius:6px;font-size:13px;width:160px;outline:none}.backdoor-code-input input:focus{border-color:var(--academic-blue)}.backdoor-code-input button{padding:6px 16px;background:var(--academic-blue);color:#fff;border:none;border-radius:6px;font-size:13px;cursor:pointer}.backdoor-code-input button:hover{background:var(--academic-blue-dark)}.backdoor-active-bar{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:8px;margin-bottom:8px}.backdoor-status{font-size:12px;color:#e74c3c;font-weight:500}.backdoor-clear-btn{padding:2px 10px;font-size:11px;background:none;border:1px solid #e74c3c;color:#e74c3c;border-radius:10px;cursor:pointer}.backdoor-clear-btn:hover{background:#fef2f2}