�� Inter 字体 */
            /* 全新终极炫彩背景渐变: "霓虹幻想" 主题 */
            background: linear-gradient(135deg, 
                #ff00ff 0%,  /* Magenta */
                #ff0080 15%, /* Deep Pink */
                #0077ff 30%, /* Bright Blue */
                #00ffdd 45%, /* Cyan/Turquoise */
                #aaff00 60%, /* Lime Green */
                #ffaa00 75%, /* Orange */
                #ff0000 90%, /* Red */
                #ff00ff 100% /* Magenta (to loop smoothly fo