*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif}:root{--primary:#4A90E2;--secondary:#50E3C2;--accent:#F5A623;--accent1:#f72585;--accent2:#4cc9f0;--accent3:#7209b7;--start_sim:#e45c13;--simulation_title:#068df6;--simulation_subject:#068df6;--addCollections:#8824e6;--removeCollections:#da6627;--chinese:#f72585;--math:#4361ee;--english:#e4621b;--physics:#8824e6;--chemistry:#e341db;--biology:#25d54d;--earth:#2380dd;--engineering:#12c5a3;--neon-purple:#9D4EDD;--neon-blue:#4EA8DE;--neon-pink:#FF2E63;--neon-green:#00F5D4;--neon-yellow:#FEE440;--dark-900:#0A0E17;--dark-800:#161B22;--dark-700:#1D2129;--dark-600:#2D333B;--gray:#808080;--lightgray:#dcdcdc;--font-inter:'Inter',sans-serif;--light:#f8f9fa;--dark:#212529;--success:#2ec4b6;--warning:#ff9f1c;--gradient1:linear-gradient(135deg,#4361ee,#3a0ca3);--gradient2:linear-gradient(135deg,#f72585,#b5179e);--gradient3:linear-gradient(135deg,#4cc9f0,#4895ef);--shadow:0 10px 20px 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.card{border:none;border-radius:0.4rem}#particles-js{position:fixed;width:100%;height:100%;top:0;left:0;z-index:-1}.light-effect{position:fixed;border-radius:50%;filter:blur(15px);z-index:-1;opacity:0.3}.light-1{width:430px;height:430px;background:radial-gradient(circle,#4A90E2 0%,transparent 70%);top:25%;left:10%;animation:float 15s infinite ease-in-out}.light-2{width:330px;height:330px;background:radial-gradient(circle,#50E3C2 0%,transparent 70%);bottom:10%;right:15%;animation:float 12s infinite ease-in-out reverse}.light-3{width:260px;height:260px;background:radial-gradient(circle,#F5A623 0%,transparent 70%);top:40%;right:10%;animation:float 18s infinite ease-in-out}@keyframes float{0%,100%{transform:translate(0,0)}25%{transform:translate(-50px,-30px)}50%{transform:translate(0,-50px)}75%{transform:translate(50px,-30px)}}.hover-glow{font-size:1.4rem;font-weight:bold;color:white;transition:all 0.3s ease;position:relative}.hover-glow:hover{color:#e32ed9!important}.hover-glow::after{content:'';position:absolute;bottom:-5px;left:0;width:0;height:2px;background:linear-gradient(to right,#4A90E2,#50E3C2);transition:width 0.3s ease}.hover-glow:hover::after{width:100%}.btn-primary{background-color:var(--primary);border-color:var(--primary)}.btn-success{background-color:var(--secondary);border-color:var(--secondary)}.btn-orange{background-color:var(--english);border-color:var(--english)}.btn-hover-glow{font-size:1.1rem;color:white;font-weight:bold;transition:all 0.3s ease;position:relative}.btn-hover-glow:hover{transform:translateY(-1px);box-shadow:0 10px 20px rgba(74,144,226,0.3)}.btn-hover-glow::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);transition:all 0.6s 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i{font-size:2.6rem;margin-right:10px;background:linear-gradient(135deg,#ff6b6b,#feca57);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.login-main-container{flex:1;display:flex;align-items:center;justify-content:center;min-height:100vh;padding:100px 20px 50px}.login-content{width:100%;max-width:1200px;margin:0 auto}.login-card-container{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}.login-hero{color:white;text-align:left}.login-hero h1{font-size:3.5rem;font-weight:800;margin-bottom:20px;background:linear-gradient(135deg,#fff,#e2e8f0);-webkit-background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2}.login-hero p{font-size:1.3rem;margin-bottom:30px;opacity:0.9;line-height:1.6}.features-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:40px}.feature-item{display:flex;align-items:center;padding:15px;background:rgba(255,255,255,0.1);border-radius:15px;backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.2);transition:all 0.3s ease}.feature-item:hover{transform:translateY(-3px);background:rgba(255,255,255,0.2)}.feature-icon{font-size:2rem;margin-right:15px;background:linear-gradient(135deg,#4facfe,#00f2fe);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.feature-text h4{font-size:1.1rem;margin-bottom:5px;font-weight:600}.feature-text p{font-size:0.9rem;opacity:0.8;margin:0}.login-form-card{background:rgba(255,255,255,0.95);backdrop-filter:blur(10px);border-radius:30px;padding:20px 40px;max-width:560px;box-shadow:var(--shadow-lg);border:1px solid rgba(255,255,255,0.3);transform:translateY(0);transition:all 0.3s ease}.login-form-card:hover{transform:translateY(-1px);box-shadow:0 30px 60px rgba(0,0,0,0.3)}.card-header-login{text-align:center;margin-bottom:30px}.card-header-login h1{font-size:2.5rem;font-weight:700;background:var(--gradient1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:10px}.card-header-login p{color:#6c757d;font-size:1.1rem}.form-group{margin-bottom:25px;position:relative}.form-label{font-weight:600;color:#495057;margin-bottom:8px;display:flex;align-items:center}.form-label i{margin-right:8px;color:var(--primary)}.form-control{border:2px solid #e9ecef;border-radius:12px;padding:15px 20px;font-size:1rem;transition:all 0.3s ease;background:#f8f9fa}.form-control:focus{border-color:var(--primary);box-shadow:0 0 0 0.2rem rgba(67,97,238,0.25);background:white;transform:translateY(-2px)}.input-group{position:relative}.input-group-text{background:var(--gradient1);border:none;color:white;border-radius:12px 0 0 12px}.form-options{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;flex-wrap:nowrap;gap:8px}.form-check{display:flex;align-items:center;flex-shrink:0}.form-check-input{margin-right:8px;transform:scale(1.2)}.form-check-label{white-space:nowrap}.forgot-password{color:var(--primary);text-decoration:none;font-weight:500;transition:all 0.3s ease;flex-shrink:0;white-space:nowrap}.forgot-password:hover{color:var(--accent1);text-decoration:underline}.login-btn{background:var(--gradient1);border:none;color:white;padding:12px 30px;border-radius:15px;font-size:1.2rem;font-weight:600;width:100%;transition:all 0.3s ease;position:relative;overflow:hidden;cursor:pointer}.login-btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.3),transparent);transition:left 0.5s ease}.login-btn:hover::before{left:100%}.login-btn:hover{transform:translateY(-3px);box-shadow:0 15px 30px rgba(102,126,234,0.4)}.login-btn:active{transform:translateY(-1px)}.login-btn i{margin-right:10px}.register-section{text-align:center;margin-top:10px;padding-top:20px;border-top:1px solid #e9ecef}.register-btn{background:var(--gradient2);border:none;color:white;padding:12px 30px;border-radius:12px;font-weight:600;text-decoration:none;display:inline-block;transition:all 0.3s ease}.register-btn:hover{transform:translateY(-1px);box-shadow:0 10px 25px rgba(240,147,251,0.4);color:white;text-decoration:none}@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}.floating-element{animation:float 6s ease-in-out infinite}.nav-links{display:flex;list-style:none}.nav-links li{margin-left:25px}.nav-links a{color:white;text-decoration:none;font-weight:500;font-size:1.1rem;transition:all 0.3s ease;padding:8px 15px;border-radius:30px}.nav-links a:hover{background:rgba(255,255,255,0.2)}.btn{display:inline-block;padding:12px 28px;background:var(--accent1);color:white;border:none;border-radius:50px;font-weight:600;cursor:pointer;text-decoration:none;transition:all 0.3s ease;box-shadow:0 4px 15px rgba(247,37,133,0.3)}.btn:hover{transform:translateY(-3px);box-shadow:0 8px 20px rgba(247,37,133,0.4)}.btn-outline{background:transparent;border:2px solid white;box-shadow:none}.btn-outline:hover{background:rgba(255,255,255,0.1)}.messages{position:fixed;top:100px;right:20px;z-index:1000;max-width:400px}.alert{padding:15px 20px;border-radius:15px;margin-bottom:15px;box-shadow:var(--shadow);display:flex;align-items:center;animation:slideIn 0.3s ease;border:none;backdrop-filter:blur(10px)}.alert-success{background:rgba(46,196,182,0.9);color:white}.alert-error{background:rgba(247,37,133,0.9);color:white}.alert-info{background:rgba(76,201,240,0.9);color:white}.alert i{margin-right:10px;font-size:1.2rem}@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}@media (max-width:2559px){.login-content{max-width:1400px}}@media (max-width:1919px){body{font-size:15px}.login-content{max-width:1200px}.login-hero h1{font-size:3rem}.card-header-login h1{font-size:2.2rem}}@media (max-width:1279px){body{font-size:14px}.login-content{max-width:100%;padding:0 20px}.login-hero h1{font-size:2.6rem}.login-hero 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