:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--border-radius: 12px;--transition-speed: .2s;--bg-color: #0f172a;--text-color: #f8fafc;--card-bg: rgba(30, 41, 59, .7);--card-border: rgba(255, 255, 255, .1);--accent-color: #10b981;--accent-hover: #059669;--gradient-bg: radial-gradient(circle at top right, #1e1b4b, #0f172a 100%);--correct-color: #10b981;--wrong-color: #ef4444}[data-theme=dark]{--bg-color: #040916;--text-color: #f1f5f9;--card-bg: rgba(15, 23, 42, .6);--card-border: rgba(255, 255, 255, .08);--accent-color: #10b981;--accent-hover: #059669;--gradient-bg: url(/space_bg.png) center/cover no-repeat fixed;--shadow: 0 8px 32px 0 rgba(0, 0, 0, .37);color-scheme:dark}[data-theme=light]{--bg-color: #f8fafc;--text-color: #0f172a;--card-bg: rgba(255, 255, 255, .8);--card-border: rgba(0, 0, 0, .08);--accent-color: #6366f1;--accent-hover: #4f46e5;--gradient-bg: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);--shadow: 0 8px 32px 0 rgba(31, 38, 135, .1);color-scheme:light}*{box-sizing:border-box;margin:0;padding:0}body{margin:0;min-height:100vh;background:var(--gradient-bg);background-color:var(--bg-color);color:var(--text-color);transition:background var(--transition-speed) ease,color var(--transition-speed) ease;overflow-x:hidden}.glass{background:var(--card-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--card-border);box-shadow:var(--shadow);border-radius:var(--border-radius)}.glass-btn{background:var(--card-bg);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border:1px solid var(--card-border);color:var(--text-color);font-family:inherit;font-size:1rem;font-weight:600;padding:.75rem 1.5rem;border-radius:var(--border-radius);cursor:pointer;transition:all var(--transition-speed) ease;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.glass-btn:hover{transform:translateY(-2px);border-color:var(--accent-color);box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d}.glass-btn:active{transform:translateY(0)}.primary-btn{background:var(--accent-color);color:#fff;border:none}.primary-btn:hover{background:var(--accent-hover);border:none}.tooltip-container{position:relative;display:flex}.tooltip-text{position:absolute;top:100%;right:0;margin-top:.5rem;background:var(--card-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);color:var(--text-color);padding:.75rem;border-radius:8px;width:250px;font-size:.85rem;box-shadow:var(--shadow);z-index:10;opacity:0;visibility:hidden;border:1px solid var(--card-border);transition:opacity var(--transition-speed) ease,visibility var(--transition-speed) ease}.tooltip-container:hover .tooltip-text{opacity:1;visibility:visible}.layout-container{display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:2rem;padding-right:calc(300px + 2rem);width:100%}.app-container{width:100%;max-width:800px;display:flex;flex-direction:column;align-items:center;justify-content:center}.ad-container{position:fixed;right:0;top:0;bottom:0;width:300px;display:flex;align-items:center;justify-content:center;padding:1rem;background:var(--card-bg);border-left:1px solid var(--card-border);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);z-index:50}@media(max-width:1000px){.layout-container{padding-right:1rem;padding-bottom:calc(250px + 2rem)}.ad-container{top:auto;left:0;right:0;width:100%;height:auto;border-left:none;border-top:1px solid var(--card-border)}}@media(max-width:600px){.layout-container{padding:1rem;padding-bottom:calc(250px + 1rem)}.app-container{justify-content:flex-start}}.menu-card{width:100%;max-width:650px;padding:2rem;display:flex;flex-direction:column;gap:1.5rem;animation:fadeIn .5s ease-out}.menu-section{display:flex;flex-direction:column;gap:.5rem}.menu-section h3{font-size:.875rem;text-transform:uppercase;letter-spacing:.05em;color:var(--accent-color);margin-bottom:.25rem}.button-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.75rem}.button-grid.modes{grid-template-columns:1fr}.glass-btn.active{border-color:var(--accent-color);background:var(--accent-color);color:#fff}.game-header{width:100%;display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;padding:1rem 1.5rem;animation:slideDown .4s ease-out}.stat-group{display:flex;align-items:center;gap:.5rem;font-size:1.25rem;font-weight:700}.stat-icon{color:var(--accent-color)}.question-area{width:100%;text-align:center;margin-bottom:3rem;padding:3rem 1rem;animation:zoomIn .3s ease-out}.equation{font-size:4rem;font-weight:800;letter-spacing:-.02em;text-shadow:0 4px 12px rgba(0,0,0,.1)}@media(max-width:600px){.equation{font-size:3rem}}.answers-grid{width:100%;display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;animation:slideUp .4s ease-out}@media(max-width:400px){.answers-grid{grid-template-columns:1fr}}.answer-btn{font-size:1.5rem;padding:1.5rem;border-radius:16px}.answer-btn.correct{background:var(--correct-color);color:#fff;border-color:var(--correct-color);animation:pulse .4s}.answer-btn.wrong{background:var(--wrong-color);color:#fff;border-color:var(--wrong-color);animation:shake .4s}.feedback-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:8rem;font-weight:900;opacity:0;pointer-events:none}.feedback-text.show-correct{color:var(--correct-color);animation:floatUpFade .6s ease-out}.feedback-text.show-wrong{color:var(--wrong-color);animation:floatUpFade .6s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes zoomIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}@keyframes floatUpFade{0%{opacity:0;transform:translate(-50%,-50%) scale(.8)}20%{opacity:.8;transform:translate(-50%,-60%) scale(1.1)}to{opacity:0;transform:translate(-50%,-80%) scale(1)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}50%{transform:translate(5px)}75%{transform:translate(-5px)}}