.app{min-height:100vh;background:#f5f5f5}:root{--primary: #4a90e2;--primary-dark: #3a7bc8;--success: #27ae60;--danger: #e74c3c;--warning: #f39c12;--dark: #2c3e50;--gray: #7f8c8d;--light: #f8f9fa;--border-radius: 12px;--shadow: 0 4px 15px rgba(0,0,0,.08)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.6;color:#333;background:#f5f5f5;min-height:100vh}.app{min-height:100vh}.card{background:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow);padding:16px;margin-bottom:12px}.btn-primary{width:100%;padding:14px;background:linear-gradient(135deg,var(--primary),#5fa3ff);color:#fff;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:transform .2s,box-shadow .2s}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #4a90e259}.btn-primary:disabled{opacity:.7;cursor:not-allowed;transform:none}.input-field{width:100%;padding:12px 16px;border:2px solid #e0e0e0;border-radius:10px;font-size:1rem;transition:border-color .3s;background:#fafafa}.input-field:focus{outline:none;border-color:var(--primary);background:#fff}.header{background:linear-gradient(135deg,var(--primary),#5fa3ff);color:#fff;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}.header-title{font-size:1.2rem;font-weight:700;letter-spacing:2px}.header-back{background:#fff3;border:1px solid rgba(255,255,255,.3);color:#fff;padding:6px 12px;border-radius:20px;font-size:.85rem;cursor:pointer;display:flex;align-items:center;gap:4px}.header-back:hover{background:#ffffff4d}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal{background:#fff;border-radius:16px;width:100%;max-width:380px;overflow:hidden;box-shadow:0 20px 50px #00000040}.modal-header{padding:16px 20px;background:linear-gradient(135deg,var(--primary),#5fa3ff);color:#fff;display:flex;justify-content:space-between;align-items:center}.modal-header h3{font-size:1rem;font-weight:600;display:flex;align-items:center;gap:8px}.modal-close{background:none;border:none;color:#fff;font-size:1.6rem;cursor:pointer;line-height:1;padding:0}.modal-body{padding:24px 20px;text-align:center}.modal-footer{padding:16px 20px;background:#f8f9fa;text-align:center}.modal-footer .btn-primary{width:auto;padding:10px 30px;display:inline-flex}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.spin{animation:spin 1s linear infinite}.error-msg{color:var(--danger);font-size:.85rem;margin-top:6px;text-align:center}.pay-btns{display:flex;gap:10px;margin-top:16px}.pay-btn{flex:1;padding:12px;border:2px solid #e0e0e0;border-radius:10px;background:#fff;cursor:pointer;font-size:.95rem;display:flex;flex-direction:column;align-items:center;gap:6px;transition:border-color .3s}.pay-btn:hover{border-color:var(--primary)}.pay-btn i{font-size:1.8rem}.pay-btn:first-child i{color:#07c160}.pay-btn:last-child i{color:#1677ff}