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60px rgba(0,0,0,0.15);--shadow-xl:0 40px 80px rgba(0,0,0,0.2);--chinese-color:#D32F2F;--chinese-light:#EF5350;--chinese-dark:#B71C1C;--math-color:#388E3C;--math-light:#4CAF50;--math-dark:#1B5E20;--english-color:#1976D2;--english-light:#2196F3;--english-dark:#0D47A1;--gradient-chinese:linear-gradient(135deg,#D32F2F 0%,#FF6F00 100%);--gradient-math:linear-gradient(135deg,#388E3C 0%,#00BCD4 100%);--gradient-english:linear-gradient(135deg,#1976D2 0%,#7B1FA2 100%);--color-border:rgba(22,93,255,0.08);--color-bg-hover:rgba(255,255,255,0.98);--text-color:#333;--text-light:#666}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:linear-gradient(-45deg,#ee7752,#e73c7e,#23a6d5,#23d5ab);background-size:400% 400%;animation:gradient 15s ease infinite;color:var(--dark);line-height:1.6;overflow-x:hidden;min-height:100vh;display:flex;flex-direction:column;font-size:16px}@keyframes gradient{0%{background-position:0% 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