:root{--bg-dark:#0f172a;--text-main:#ffffff;--text-secondary:#94a3b8;--accent-color:#00f260;--accent-secondary:#0575e6;--card-bg:rgba(30,41,59,0.7);--glass-border:rgba(255,255,255,0.1)}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif}body{background-color:var(--bg-dark);color:var(--text-main);overflow-x:hidden;transition:background .5s}#canvas-container{position:fixed;top:0;left:0;width:100%;height:100%;z-index:-1;background:radial-gradient(circle at center,#1a202c 0%,#000000 100%)}.theme-switch-container{position:fixed;right:20px;top:50%;transform:translateY(-50%);z-index:2000;display:flex;flex-direction:column;gap:15px;background:rgba(255,255,255,0.05);padding:15px 10px;border-radius:30px;border:1px solid var(--glass-border);backdrop-filter:blur(5px)}.theme-btn{width:25px;height:25px;border-radius:50%;cursor:pointer;border:2px solid transparent;transition:transform .3s,border-color .3s}.theme-btn:hover{transform:scale(1.3)}.theme-btn.active{border-color:#fff;transform:scale(1.2)}.navbar{position:fixed;top:0;width:100%;padding:1rem 5%;background:rgba(15,23,42,0.8);backdrop-filter:blur(10px);border-bottom:1px solid var(--glass-border);z-index:1000;display:flex;justify-content:space-between;align-items:center}@keyframes rgbFlow{0%{filter:hue-rotate(0deg)}100%{filter:hue-rotate(360deg)}}.logo{font-size:1.5rem;font-weight:800;background:linear-gradient(45deg,var(--accent-color),var(--accent-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;text-decoration:none;animation:rgbFlow 8s linear infinite}.nav-links{display:flex;gap:20px;list-style:none}.nav-links a{color:var(--text-main);text-decoration:none;font-weight:500;font-size:.95rem;transition:color .3s;position:relative}.nav-links a::after{content:'';position:absolute;width:0;height:2px;bottom:-5px;left:0;background:var(--accent-color);transition:width .3s}.nav-links a:hover::after{width:100%}.hero{min-height:60vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:80px 20px 20px}.hero h1{font-size:4rem;font-weight:900;line-height:1.1;margin-bottom:1rem;text-shadow:0 0 20px rgba(0,0,0,.5)}.hero h1 span{display:block;font-size:1.5rem;font-weight:400;color:var(--accent-color);margin-bottom:10px;letter-spacing:2px}.hero p{font-size:1.2rem;color:var(--text-secondary);max-width:600px;margin-bottom:2rem}.quiz-section{padding:2rem 5%;max-width:1400px;margin:0 auto}.section-title{font-size:2rem;margin-bottom:2rem;border-left:5px solid var(--accent-secondary);padding-left:15px;display:flex;align-items:center;gap:10px}.grid-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:30px;perspective:1000px}.quiz-card{position:relative;background:var(--card-bg);border:1px solid var(--glass-border);border-radius:20px;padding:30px 20px;text-align:center;transition:transform .5s cubic-bezier(.23,1,.32,1),box-shadow .5s;overflow:hidden;transform-style:preserve-3d;cursor:pointer;text-decoration:none;display:block}.quiz-card::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,rgba(255,255,255,0.05) 0%,rgba(255,255,255,0) 100%);z-index:-1}.quiz-card:hover{transform:translateY(-10px) rotateX(5deg) rotateY(5deg);box-shadow:0 20px 40px rgba(0,0,0,.4),0 0 20px rgba(255,255,255,.1);border-color:var(--accent-color)}.icon-box{font-size:3rem;margin-bottom:15px;transition:transform .3s}.quiz-card:hover .icon-box{transform:scale(1.2) translateZ(20px)}.card-title{font-size:1.5rem;font-weight:700;color:var(--text-main);margin-bottom:10px;transform:translateZ(10px)}.card-desc{font-size:.9rem;color:var(--text-secondary);margin-bottom:20px;transform:translateZ(5px)}.start-btn{display:inline-block;padding:10px 25px;background:linear-gradient(90deg,var(--accent-secondary),var(--accent-color));color:#fff;border-radius:50px;font-weight:700;text-transform:uppercase;font-size:.8rem;letter-spacing:1px;transition:all .3s;border:none}.quiz-card:hover .start-btn{box-shadow:0 5px 15px rgba(255,255,255,.2);transform:scale(1.05)}.modern-footer{margin-top:5rem;background:rgba(10,15,25,.95);padding:4rem 2rem 2rem;border-top:1px solid var(--glass-border)}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:3rem;max-width:1200px;margin:0 auto}.footer-col h4{color:var(--accent-color);margin-bottom:1.5rem;font-size:1.2rem;position:relative;display:inline-block}.footer-col h4::after{content:'';position:absolute;width:50%;height:2px;bottom:-5px;left:0;background:var(--accent-secondary)}.footer-links{list-style:none}.footer-links li{margin-bottom:.8rem}.footer-links a{color:var(--text-secondary);text-decoration:none;transition:all .3s;display:flex;align-items:center;gap:8px}.footer-links a:hover{color:var(--accent-color);padding-left:5px}.social-icons{display:flex;gap:15px;margin-top:1rem}.social-btn{width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.1);display:flex;justify-content:center;align-items:center;color:#fff;text-decoration:none;transition:all .3s;border:1px solid transparent}.social-btn:hover{background:var(--accent-secondary);transform:rotate(360deg);border-color:#fff}.copyright{text-align:center;margin-top:3rem;padding-top:2rem;border-top:1px solid rgba(255,255,255,.05);color:var(--text-secondary);font-size:.9rem}.menu-toggle{display:none;font-size:1.5rem;cursor:pointer;color:#fff;animation:rgbFlow 8s linear infinite}@media (max-width:768px){.hero h1{font-size:2.5rem}.menu-toggle{display:block}.theme-switch-container{right:10px;padding:10px 5px}.nav-links{display:none;flex-direction:column;width:100%;position:absolute;top:100%;left:0;background:rgba(15,23,42,.95);padding:20px 0;border-bottom:1px solid var(--glass-border);text-align:center}.nav-links.active{display:flex}.nav-links li{margin:15px 0}}