:root{--color-primary: #FFD93D;--color-primary-dark: #F4C430;--color-secondary: #6BCB77;--color-accent: #FF6B6B;--color-info: #4D96FF;--color-purple: #9B59B6;--color-puzzle: #FFD93D;--color-memory: #9B59B6;--color-math: #10B981;--color-reflex: #FF6B6B;--color-creative: #4ECDC4;--color-white: #FFFFFF;--color-gray-50: #F9FAFB;--color-gray-100: #F3F4F6;--color-gray-200: #E5E7EB;--color-gray-300: #D1D5DB;--color-gray-400: #9CA3AF;--color-gray-500: #6B7280;--color-gray-600: #4B5563;--color-gray-700: #374151;--color-gray-800: #1F2937;--color-gray-900: #111827;--color-success: #10B981;--color-warning: #F59E0B;--color-error: #EF4444;--bg-gradient-yellow: linear-gradient(135deg, #FFD93D 0%, #FFA502 100%);--bg-gradient-green: linear-gradient(135deg, #6BCB77 0%, #20BF6B 100%);--bg-gradient-blue: linear-gradient(135deg, #4D96FF 0%, #2D8CF0 100%);--bg-gradient-purple: linear-gradient(135deg, #9B59B6 0%, #8E44AD 100%);--bg-gradient-red: linear-gradient(135deg, #FF6B6B 0%, #EE5A6F 100%);--bg-gradient-cyan: linear-gradient(135deg, #4ECDC4 0%, #44A3AA 100%);--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-bold: 700;--font-weight-extrabold: 800;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-3xl: 2rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, .25);--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease;--transition-bounce: .3s cubic-bezier(.34, 1.56, .64, 1);--z-dropdown: 100;--z-sticky: 200;--z-modal: 300;--z-toast: 400;--z-tooltip: 500}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:1.5;color:var(--color-gray-800);background:var(--color-gray-50);min-height:100vh;overscroll-behavior:none}*{touch-action:manipulation}.loading-screen{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg-gradient-yellow);z-index:9999}.loading-spinner{font-size:4rem;animation:bounce 1s ease infinite}.loading-text{margin-top:var(--space-4);font-size:var(--font-size-lg);font-weight:var(--font-weight-medium);color:var(--color-gray-800)}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}.update-toast{position:fixed;bottom:var(--space-6);left:50%;transform:translate(-50%);display:flex;align-items:center;gap:var(--space-4);padding:var(--space-4) var(--space-6);background:var(--color-gray-800);color:var(--color-white);border-radius:var(--radius-full);box-shadow:var(--shadow-lg);z-index:var(--z-toast);transition:var(--transition-base)}.update-toast.hidden{opacity:0;pointer-events:none;transform:translate(-50%) translateY(100px)}.update-toast button{padding:var(--space-2) var(--space-4);background:var(--color-primary);color:var(--color-gray-900);border:none;border-radius:var(--radius-full);font-weight:var(--font-weight-bold);cursor:pointer;transition:var(--transition-fast)}.update-toast button:hover{background:var(--color-primary-dark)}.hidden{display:none!important}.invisible{visibility:hidden}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.flex-1{flex:1}.gap-2{gap:var(--space-2)}.gap-4{gap:var(--space-4)}.text-center{text-align:center}.font-bold{font-weight:var(--font-weight-bold)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);font-size:var(--font-size-base);font-weight:var(--font-weight-bold);border:none;border-radius:var(--radius-xl);cursor:pointer;transition:var(--transition-fast);-webkit-tap-highlight-color:transparent}.btn:active{transform:scale(.95)}.btn-primary{background:var(--bg-gradient-yellow);color:var(--color-gray-900);box-shadow:var(--shadow-md)}.btn-primary:hover{box-shadow:var(--shadow-lg)}.btn-secondary{background:var(--color-gray-200);color:var(--color-gray-700)}.btn-secondary:hover{background:var(--color-gray-300)}.game-page{min-height:100vh;display:flex;flex-direction:column}.game-container{flex:1;display:flex;flex-direction:column;max-width:900px;margin:0 auto;width:100%;padding:var(--space-4)}.back-link{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);color:var(--color-gray-600);text-decoration:none;font-weight:var(--font-weight-medium);border-radius:var(--radius-lg);transition:var(--transition-fast)}.back-link:hover{background:var(--color-gray-100);color:var(--color-gray-800)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.animate-fadeIn{animation:fadeIn .3s ease}.animate-slideUp{animation:slideUp .3s ease}.animate-pulse{animation:pulse .5s ease}.animate-shake{animation:shake .4s ease}@media (min-width: 768px){html{font-size:18px}.game-container{padding:var(--space-6)}}@media (min-width: 1024px){html{font-size:20px}.game-container{padding:var(--space-8)}}@media (min-width: 1366px){.game-container{max-width:1200px}}