*{margin:0;padding:0;box-sizing:border-box}:root{--primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);--dark-gradient: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);--premium-gradient: linear-gradient(135deg, #8360c3 0%, #2ebf91 100%);--glass-bg: rgba(255, 255, 255, .1);--glass-border: rgba(255, 255, 255, .2);--glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, .37);--success-color: #00d4aa;--warning-color: #ffd166;--error-color: #ef476f;--info-color: #118ab2;--purple-color: #7209b7;--text-dark: #1a1a1a;--text-light: #6c757d;--white: #ffffff;--black: #000000;--card-bg: rgba(255, 255, 255, .95);--shadow: 0 20px 40px rgba(0, 0, 0, .1);--shadow-lg: 0 30px 60px rgba(0, 0, 0, .15);--shadow-xl: 0 50px 100px rgba(0, 0, 0, .2);--border-radius: 20px;--border-radius-lg: 30px;--border-radius-xl: 40px}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--premium-gradient);min-height:100vh;color:var(--text-dark);line-height:1.7;overflow-x:hidden}.glass{background:var(--glass-bg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow)}.app{min-height:100vh;display:flex;flex-direction:column;position:relative}.app:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at 20% 80%,rgba(120,119,198,.3) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(255,119,198,.3) 0%,transparent 50%),radial-gradient(circle at 40% 40%,rgba(120,219,255,.2) 0%,transparent 50%);pointer-events:none;z-index:-1}.header{background:#ffffff14;-webkit-backdrop-filter:blur(25px);backdrop-filter:blur(25px);border-bottom:1px solid rgba(255,255,255,.15);padding:1.2rem 0;position:sticky;top:0;z-index:1000;transition:all .3s ease}.header.scrolled{background:#ffffff1f;-webkit-backdrop-filter:blur(30px);backdrop-filter:blur(30px)}.header-content{max-width:1400px;margin:0 auto;padding:0 2rem;display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:1rem;color:var(--white);font-weight:800;font-size:1.6rem;text-shadow:0 2px 10px rgba(0,0,0,.3)}.logo-icon{font-size:2.2rem;background:linear-gradient(135deg,#fff,#f0f0f0);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.main-content{flex:1;display:flex;align-items:center;justify-content:center;padding:4rem 2rem;position:relative}.hero-section{max-width:1400px;margin:0 auto;display:grid;grid-template-columns:1.2fr 1fr;gap:6rem;align-items:center}.hero-text h1{font-size:4rem;font-weight:900;background:linear-gradient(135deg,#fff,#ffffffe6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:1.5rem;line-height:1.1;letter-spacing:-.02em;text-shadow:0 4px 20px rgba(0,0,0,.2)}.hero-text p{font-size:1.4rem;color:#fffffff2;margin-bottom:3rem;font-weight:400;line-height:1.6}.features-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-bottom:4rem}.feature-item{display:flex;align-items:flex-start;gap:1.2rem;padding:1.5rem;background:#ffffff14;border-radius:20px;border:1px solid rgba(255,255,255,.15);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all .3s ease}.feature-item:hover{background:#ffffff1f;transform:translateY(-5px);box-shadow:0 15px 30px #0003}.feature-icon{font-size:1.8rem;background:linear-gradient(135deg,var(--success-color),var(--info-color));padding:1rem;border-radius:16px;display:flex;align-items:center;justify-content:center;min-width:70px;height:70px;box-shadow:0 8px 20px #00d4aa4d}.feature-content h4{color:var(--white);font-size:1.2rem;font-weight:700;margin-bottom:.5rem}.feature-content p{color:#fffc;font-size:.95rem;line-height:1.5;margin:0}.action-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:2.5rem;margin-top:4rem}.action-card{background:var(--card-bg);padding:3rem 2.5rem;border-radius:var(--border-radius-lg);text-align:center;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.3);box-shadow:var(--shadow-xl);transition:all .4s cubic-bezier(.175,.885,.32,1.275);position:relative;overflow:hidden}.action-card:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .6s}.action-card:hover:before{left:100%}.action-card:hover{transform:translateY(-15px) scale(1.02);box-shadow:var(--shadow-xl)}.card-icon{font-size:4rem;margin-bottom:2rem;padding:2rem;border-radius:25px;display:inline-flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--success-color),var(--info-color));box-shadow:0 15px 30px #00d4aa66}.card-title{font-size:1.8rem;font-weight:800;color:var(--text-dark);margin-bottom:1.2rem;letter-spacing:-.02em}.card-description{color:var(--text-light);margin-bottom:2.5rem;font-size:1.1rem;line-height:1.6;font-weight:400}.btn{padding:1.2rem 2.5rem;border:none;border-radius:15px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:.8rem;position:relative;overflow:hidden;letter-spacing:.5px}.btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);transition:left .6s}.btn:hover:before{left:100%}.btn-primary{background:linear-gradient(135deg,var(--success-color),var(--info-color));color:var(--white);border:none;box-shadow:0 10px 30px #00d4aa66}.btn-primary:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 15px 40px #00d4aa99}.btn-secondary{background:#ffffff26;color:var(--white);border:2px solid rgba(255,255,255,.3);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 8px 25px #0000001a}.btn-secondary:hover{background:#ffffff40;border-color:#ffffff80;transform:translateY(-3px) scale(1.05);box-shadow:0 12px 35px #0003}.hero-actions{display:flex;gap:1.5rem;flex-wrap:wrap}.scanner-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000f2;display:flex;align-items:center;justify-content:center;z-index:2000;padding:2rem;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}.scanner-container{background:linear-gradient(135deg,#fffffffa,#fffffff2);border-radius:var(--border-radius-lg);padding:3rem;max-width:550px;width:100%;box-shadow:var(--shadow-xl);border:1px solid rgba(255,255,255,.4)}.scanner-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.scanner-header h3{color:var(--text-dark);font-size:1.8rem;font-weight:800;background:linear-gradient(135deg,var(--text-dark),var(--info-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.close-btn{background:#0000001a;border:none;font-size:1.5rem;cursor:pointer;color:var(--text-light);padding:.8rem;border-radius:12px;transition:all .3s ease}.close-btn:hover{background:#0003;transform:rotate(90deg)}.scanner-video-container{position:relative;background:#000;border-radius:20px;overflow:hidden;margin-bottom:2rem;min-height:350px;display:flex;align-items:center;justify-content:center;border:3px solid rgba(255,255,255,.3);box-shadow:0 15px 35px #0000004d}.scanner-video{width:100%;height:auto;max-height:450px}.scanner-frame{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:250px;height:250px;border:3px solid var(--success-color);border-radius:20px;box-shadow:0 0 0 1000px #000000b3}.scanner-corner{position:absolute;width:30px;height:30px;border:4px solid var(--success-color)}.scanner-corner.top-left{top:-4px;left:-4px;border-right:none;border-bottom:none;border-radius:15px 0 0}.scanner-corner.top-right{top:-4px;right:-4px;border-left:none;border-bottom:none;border-radius:0 15px 0 0}.scanner-corner.bottom-left{bottom:-4px;left:-4px;border-right:none;border-top:none;border-radius:0 0 0 15px}.scanner-corner.bottom-right{bottom:-4px;right:-4px;border-left:none;border-top:none;border-radius:0 0 15px}.scanner-line{position:absolute;top:0;left:0;width:100%;height:4px;background:linear-gradient(90deg,transparent,var(--success-color),transparent);animation:scan 2s ease-in-out infinite}@keyframes scan{0%{top:0;opacity:0}50%{opacity:1}to{top:100%;opacity:0}}.scanner-loading{text-align:center;padding:3rem;color:var(--white)}.spinner{border:4px solid rgba(255,255,255,.3);border-top:4px solid var(--success-color);border-radius:50%;width:60px;height:60px;animation:spin 1s linear infinite;margin:0 auto 1.5rem;box-shadow:0 0 20px #00d4aa80}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000e6;display:flex;align-items:center;justify-content:center;z-index:2000;padding:2rem;-webkit-backdrop-filter:blur(25px);backdrop-filter:blur(25px)}.modal-content{background:linear-gradient(135deg,#fffffffa,#fffffff2);border-radius:var(--border-radius-lg);padding:3rem;max-width:500px;width:100%;box-shadow:var(--shadow-xl);border:1px solid rgba(255,255,255,.4);position:relative}.login-container{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000f2;display:flex;align-items:center;justify-content:center;z-index:2000;padding:2rem;-webkit-backdrop-filter:blur(30px);backdrop-filter:blur(30px)}.login-content{background:linear-gradient(135deg,#fffffffa,#fffffff2);border-radius:var(--border-radius-lg);padding:3.5rem;max-width:480px;width:100%;box-shadow:var(--shadow-xl);border:1px solid rgba(255,255,255,.4);position:relative}.login-content:before{content:"";position:absolute;top:-2px;left:-2px;right:-2px;bottom:-2px;background:linear-gradient(135deg,var(--success-color),var(--info-color),var(--purple-color));border-radius:var(--border-radius-lg);z-index:-1;opacity:.3;filter:blur(10px)}.back-button{background:#00000014;border:1px solid rgba(0,0,0,.1);color:var(--text-light);cursor:pointer;font-size:.95rem;font-weight:600;margin-bottom:1.5rem;display:flex;align-items:center;gap:.7rem;transition:all .3s ease;padding:.8rem 1.2rem;border-radius:12px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.back-button:hover{background:#0000001f;color:var(--text-dark);transform:translate(-5px)}.login-header{text-align:center;margin-bottom:2.5rem}.login-logo{font-size:4rem;margin-bottom:1.5rem;background:linear-gradient(135deg,var(--success-color),var(--info-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;filter:drop-shadow(0 4px 8px rgba(0,0,0,.2))}.login-header h2{color:var(--text-dark);margin-bottom:.8rem;font-size:2rem;font-weight:800;letter-spacing:-.02em}.login-header p{color:var(--text-light);font-size:1.1rem;font-weight:400}.form-group{margin-bottom:2rem}.form-group label{display:block;margin-bottom:.8rem;font-weight:700;color:var(--text-dark);font-size:1rem;letter-spacing:.5px}.form-group input{width:100%;padding:1.2rem 1.5rem;border:2px solid #e8e8e8;border-radius:15px;font-size:1rem;transition:all .3s ease;background:#ffffffe6;font-weight:500}.form-group input:focus{outline:none;border-color:var(--info-color);background:var(--white);box-shadow:0 0 0 3px #118ab21a;transform:translateY(-2px)}.input-help{font-size:.9rem;color:var(--text-light);margin-top:.7rem;font-weight:400}.login-submit-btn{width:100%;padding:1.3rem 2rem;background:linear-gradient(135deg,var(--success-color),var(--info-color));color:#fff;border:none;border-radius:15px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;align-items:center;justify-content:center;gap:.8rem;letter-spacing:.5px;box-shadow:0 10px 30px #00d4aa66;position:relative;overflow:hidden}.login-submit-btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);transition:left .6s}.login-submit-btn:hover:before{left:100%}.login-submit-btn:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 15px 40px #00d4aa99}.login-submit-btn:disabled{background:#9ca3af;transform:none;box-shadow:none;cursor:not-allowed}.spinner-small{display:inline-block;width:18px;height:18px;border:2px solid transparent;border-top:2px solid white;border-radius:50%;animation:spin 1s linear infinite}.verification-pending{text-align:center;padding:3rem 2rem}.notification-sent{color:var(--success-color);font-weight:700;margin-bottom:1.5rem;font-size:1.1rem}.challenge-id{font-size:.9rem;color:var(--text-light);font-family:Monaco,Consolas,monospace;margin-bottom:1.2rem;background:#0000000d;padding:.8rem 1.2rem;border-radius:10px;display:inline-block}.timeout-notice{font-size:.9rem;color:var(--text-light);font-weight:500}.error-message{background:linear-gradient(135deg,#ef476f1a,#ef476f0d);color:var(--error-color);padding:1.2rem 1.5rem;border-radius:15px;margin-bottom:1.5rem;border:1px solid rgba(239,71,111,.2);font-weight:600;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.warning-message{background:linear-gradient(135deg,#ffd1661a,#ffd1660d);color:#e6a700;padding:1.2rem 1.5rem;border-radius:15px;margin-bottom:1.5rem;border:1px solid rgba(255,209,102,.2);font-weight:600;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.mobile-app-info{color:var(--text-light);font-size:.95rem;text-align:center;margin-top:2rem;font-weight:500}.mobile-app-info a{color:var(--info-color);text-decoration:none;font-weight:600;transition:all .3s ease}.mobile-app-info a:hover{color:var(--success-color);text-decoration:underline}.attendance-form{text-align:center}.form-header{margin-bottom:2.5rem}.form-header h3{color:var(--text-dark);margin-bottom:.8rem;font-size:1.8rem;font-weight:800;background:linear-gradient(135deg,var(--text-dark),var(--info-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.form-header p{color:var(--text-light);font-size:1.1rem;font-weight:500}.attendance-type-selector{display:flex;gap:1.2rem;justify-content:center;margin-bottom:2.5rem;flex-wrap:wrap}.attendance-type-selector label{display:flex;align-items:center;gap:.8rem;cursor:pointer;padding:1rem 1.8rem;background:linear-gradient(135deg,#3b82f61a,#3b82f60d);border-radius:15px;color:var(--info-color);font-weight:600;border:2px solid rgba(59,130,246,.2);transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.attendance-type-selector label:hover{background:linear-gradient(135deg,#3b82f626,#3b82f61a);border-color:#3b82f666;transform:translateY(-2px)}.attendance-type-selector input[type=radio]{accent-color:var(--info-color);transform:scale(1.2)}.scan-btn{width:100%;margin-bottom:1.5rem;padding:1.3rem 2rem;font-size:1.1rem;font-weight:700}.message{padding:1.2rem 1.5rem;border-radius:15px;margin:1.5rem 0;text-align:center;font-weight:600;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.message.success{background:linear-gradient(135deg,#00d4aa1a,#00d4aa0d);color:var(--success-color);border:1px solid rgba(0,212,170,.2)}.message.error{background:linear-gradient(135deg,#ef476f1a,#ef476f0d);color:var(--error-color);border:1px solid rgba(239,71,111,.2)}@media (max-width: 1200px){.hero-section{gap:4rem}.hero-text h1{font-size:3.5rem}}@media (max-width: 968px){.hero-section{grid-template-columns:1fr;gap:4rem;text-align:center}.hero-text h1{font-size:3rem}.features-grid{grid-template-columns:1fr;gap:1.5rem}.action-grid{grid-template-columns:1fr;gap:2rem}}@media (max-width: 768px){.header-content{padding:0 1.5rem;flex-direction:column;gap:1.2rem}.hero-text h1{font-size:2.5rem}.hero-text p{font-size:1.2rem}.hero-actions{justify-content:center}.btn{padding:1.1rem 2rem;font-size:1rem}.action-card,.login-content,.scanner-container,.modal-content{padding:2.5rem 2rem}}@media (max-width: 480px){.main-content{padding:2rem 1rem}.hero-text h1{font-size:2.2rem}.feature-item{padding:1.2rem}.feature-icon{min-width:60px;height:60px;font-size:1.5rem}.action-card{padding:2rem 1.5rem}.card-icon{font-size:3.5rem;padding:1.5rem}}.hidden{display:none}.text-center{text-align:center}.mb-2{margin-bottom:2rem}.mt-2{margin-top:2rem}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}.floating{animation:float 6s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.pulse{animation:pulse 2s ease-in-out infinite}@keyframes glow{0%,to{box-shadow:0 0 20px #00d4aa66}50%{box-shadow:0 0 40px #00d4aacc}}.glow{animation:glow 3s ease-in-out infinite}