:root{--primary: #1890ff;--success: #52c41a;--danger: #ff4d4f;--orange: #fa8c16;--text: #333;--text-secondary: #666;--border: #e8e8e8;--bg: #f5f5f5;--white: #fff;--shadow: 0 2px 12px rgba(0,0,0,.08)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}.container{max-width:480px;margin:0 auto;min-height:100vh;background:var(--bg)}.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:12px}.product-card{background:var(--white);border-radius:8px;overflow:hidden;box-shadow:var(--shadow)}.product-card .img{width:100%;height:160px;background:linear-gradient(135deg,#e6f7ff,#bae7ff);display:flex;align-items:center;justify-content:center;font-size:40px}.product-card .info{padding:10px 12px}.product-card .name{font-size:14px;font-weight:500;margin-bottom:6px}.product-card .price{color:var(--danger);font-size:18px;font-weight:600}.product-card .price span{font-size:12px}.btn{display:inline-block;padding:10px 24px;border:none;border-radius:6px;font-size:15px;cursor:pointer;text-align:center;text-decoration:none}.btn-primary{background:var(--primary);color:var(--white)}.btn-danger{background:var(--danger);color:var(--white)}.btn-outline{background:var(--white);color:var(--primary);border:1px solid var(--primary)}.btn-block{display:block;width:100%}.btn:disabled{opacity:.5;cursor:not-allowed}.form-group{margin-bottom:14px}.form-group label{display:block;font-size:13px;color:var(--text-secondary);margin-bottom:4px}.form-input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:6px;font-size:14px;outline:none;transition:border-color .2s}.form-input:focus{border-color:var(--primary)}.form-textarea{min-height:60px;resize:vertical}.header{background:var(--white);padding:12px 16px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow);position:sticky;top:0;z-index:10}.header h1{font-size:17px;font-weight:600}.tag{display:inline-block;padding:2px 8px;border-radius:4px;font-size:11px}.tag-pending{background:#fff7e6;color:var(--orange)}.tag-paid{background:#f6ffed;color:var(--success)}.tag-done{background:#e6f7ff;color:var(--primary)}.loading{display:flex;align-items:center;justify-content:center;padding:40px}.spinner{width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.toast{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:#000000bf;color:#fff;padding:12px 24px;border-radius:6px;font-size:14px;z-index:999}