:root{--primary-color: #646cff;--primary-hover: #535bf2;--text-primary: #213547;--text-secondary: #666;--bg-light: #ffffff;--bg-gray: #f8f9fa;--border-color: #e0e0e0;--success-color: #10b981;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .1);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 25px rgba(0, 0, 0, .1);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px}@media (prefers-color-scheme: dark){:root{--text-primary: rgba(255, 255, 255, .87);--text-secondary: rgba(255, 255, 255, .6);--bg-light: #1a1a1a;--bg-gray: #242424;--border-color: #333;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 25px rgba(0, 0, 0, .3)}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--bg-light);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:0 20px}.header{display:flex;justify-content:space-between;align-items:center;padding:20px 0;margin-bottom:40px}.logo{height:40px;transition:transform .3s ease}.logo:hover{transform:scale(1.05)}.social-links{display:flex;gap:15px;align-items:center}.social-links a{display:flex;align-items:center;transition:transform .2s ease}.social-links a:hover{transform:translateY(-2px)}.social-links img{width:24px;height:24px;opacity:.7;transition:opacity .2s ease}.social-links img:hover{opacity:1}@media (prefers-color-scheme: dark){.social-links img{filter:invert(1)}}.hero{text-align:center;padding:60px 0;max-width:800px;margin:0 auto}.hero-title{font-size:clamp(2.5rem,5vw,4rem);font-weight:700;line-height:1.2;margin-bottom:20px;background:linear-gradient(135deg,var(--primary-color),var(--primary-hover));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:clamp(1.1rem,2vw,1.3rem);color:var(--text-secondary);line-height:1.7;max-width:700px;margin:0 auto}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px;padding:60px 0;margin-bottom:60px}.feature-card{background:var(--bg-gray);padding:30px;border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all .3s ease;border:1px solid var(--border-color)}.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}.feature-icon{font-size:3rem;margin-bottom:15px}.feature-card h3{font-size:1.3rem;margin-bottom:10px;color:var(--text-primary)}.feature-card p{color:var(--text-secondary);font-size:.95rem;line-height:1.6}.demo-section{max-width:600px;margin:0 auto 80px;padding:40px;background:var(--bg-gray);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border-color)}.section-title{font-size:2rem;text-align:center;margin-bottom:10px;color:var(--text-primary)}.section-subtitle{text-align:center;color:var(--text-secondary);margin-bottom:30px;font-size:1rem}.demo-form{display:flex;flex-direction:column;gap:20px}.form-group{display:flex;flex-direction:column;gap:8px}.form-group label{font-weight:500;font-size:.9rem;color:var(--text-primary)}.form-group input,.form-group select,.form-group textarea{padding:12px 16px;border:1px solid var(--border-color);border-radius:var(--radius-sm);font-size:1rem;font-family:inherit;background-color:var(--bg-light);color:var(--text-primary);transition:all .2s ease}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #646cff1a}.form-group textarea{resize:vertical;min-height:100px}fieldset{border:none;padding:0;margin:0}legend{font-weight:500;font-size:.9rem;color:var(--text-primary);padding:0;margin-bottom:8px}.radio-group,.checkbox-group{display:flex;flex-direction:column;gap:12px;padding:8px 0}.radio-label,.checkbox-label{display:flex;align-items:center;gap:10px;cursor:pointer;padding:10px 12px;border:1px solid var(--border-color);border-radius:var(--radius-sm);background-color:var(--bg-light);transition:all .2s ease}.radio-label:hover,.checkbox-label:hover{border-color:var(--primary-color);background-color:var(--bg-gray)}.radio-label input[type=radio],.checkbox-label input[type=checkbox]{width:18px;height:18px;cursor:pointer;accent-color:var(--primary-color)}.radio-label span,.checkbox-label span{font-size:.95rem;color:var(--text-primary)}.submit-btn{padding:14px 28px;background:var(--primary-color);color:#fff;border:none;border-radius:var(--radius-sm);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;margin-top:10px;display:flex;align-items:center;justify-content:center;gap:10px;min-height:50px}.submit-btn:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.submit-btn:disabled{opacity:.7;cursor:not-allowed}#btn-animation{width:50px;height:50px}.success-message{text-align:center;animation:fadeIn .5s ease}.success-icon{width:100px;height:100px;margin:0 auto 20px}.success-message h3{font-size:1.8rem;color:var(--success-color);margin-bottom:15px}.success-message p{color:var(--text-secondary);margin-bottom:25px;font-size:1.1rem}.demo-link{display:inline-block;padding:14px 32px;background:var(--primary-color);color:#fff;text-decoration:none;border-radius:var(--radius-sm);font-weight:600;font-size:1.1rem;transition:all .3s ease;margin-bottom:15px}.demo-link:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.demo-credentials{color:var(--text-secondary);font-size:.9rem;margin-top:15px}.footer{text-align:center;padding:40px 0;color:var(--text-secondary);font-size:.9rem;border-top:1px solid var(--border-color);margin-top:80px}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 768px){.header{flex-direction:column;gap:20px;text-align:center}.hero{padding:40px 0}.hero-title{font-size:2rem}.hero-subtitle{font-size:1rem}.features{grid-template-columns:1fr;gap:20px;padding:40px 0}.demo-section{padding:30px 20px;margin-bottom:60px}.section-title{font-size:1.6rem}.social-links{justify-content:center}}@media (max-width: 480px){.container{padding:0 15px}.logo{height:32px}.social-links img{width:20px;height:20px}.demo-section{padding:20px 15px}.form-group input,.form-group select,.form-group textarea{font-size:16px}}