.navigation{position:fixed;top:0;left:0;right:0;background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);z-index:1000;height:60px}.nav-container{display:flex;align-items:center;justify-content:space-between;height:100%}.logo{display:flex;align-items:center;gap:8px;font-size:24px;font-weight:700;color:var(--primary-color);text-decoration:none;transition:transform .2s}.logo:hover{transform:scale(1.05);text-decoration:none}.logo-icon{font-size:32px;line-height:1}.nav-links{display:flex;list-style:none;gap:32px;margin:0;padding:0}.nav-links a{color:var(--text-primary);font-weight:500;text-decoration:none;padding:8px 12px;border-radius:8px;transition:all .2s}.nav-links a:hover{background:var(--surface);text-decoration:none}.nav-links a.active{color:var(--primary-color);background:#007aff1a}.nav-actions{display:flex;align-items:center;gap:12px}.lang-toggle{background:transparent;border:2px solid var(--border);color:var(--text-primary);padding:8px 16px;border-radius:20px;font-weight:600;font-size:14px;transition:all .3s;cursor:pointer}.lang-toggle:hover{border-color:var(--primary-color);color:var(--primary-color);background:#007aff0d}.download-btn{background:var(--primary-color);color:#fff;padding:10px 24px;border-radius:20px;font-weight:600;text-decoration:none;transition:all .3s;border:none}.download-btn:hover{background:#0051d5;transform:translateY(-2px);box-shadow:0 4px 12px var(--shadow);text-decoration:none}@media (max-width: 768px){.nav-links{gap:16px}.nav-links a{padding:6px 8px;font-size:14px}.logo-text{display:none}.nav-actions{gap:8px}.lang-toggle{padding:6px 12px;font-size:12px}.download-btn{padding:8px 16px;font-size:14px}}.footer{background:var(--surface);border-top:1px solid var(--border);margin-top:80px}.footer-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;padding:60px 20px 40px}.footer-section h3{font-size:24px;margin-bottom:12px;color:var(--primary-color)}.footer-section h4{font-size:16px;margin-bottom:16px;color:var(--text-primary);font-weight:600}.footer-section p{color:var(--text-secondary);line-height:1.6;margin:0}.footer-section ul{list-style:none;padding:0;margin:0}.footer-section ul li{margin-bottom:12px}.footer-section ul li a{color:var(--text-secondary);text-decoration:none;transition:color .2s}.footer-section ul li a:hover{color:var(--primary-color);text-decoration:underline}.footer-bottom{border-top:1px solid var(--border);padding:24px 0;text-align:center}.footer-bottom p{color:var(--text-secondary);font-size:14px;margin:0}@media (max-width: 768px){.footer-container{grid-template-columns:1fr;gap:32px;padding:40px 16px 32px}}.layout{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;padding-top:80px}.hero{padding:80px 0;background:linear-gradient(135deg,#f5f7fa,#e8ecf3)}.hero-content{max-width:600px}.hero-title{font-size:56px;font-weight:800;line-height:1.1;margin-bottom:24px;color:var(--text-primary)}.gradient-text{background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-description{font-size:20px;color:var(--text-secondary);margin-bottom:32px;line-height:1.6}.hero-buttons{display:flex;gap:16px;flex-wrap:wrap}.btn{padding:14px 32px;border-radius:24px;font-weight:600;font-size:16px;text-decoration:none;transition:all .3s;display:inline-block;border:none}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:#0051d5;transform:translateY(-2px);box-shadow:0 8px 16px var(--shadow);text-decoration:none}.btn-secondary{background:#fff;color:var(--primary-color);border:2px solid var(--primary-color)}.btn-secondary:hover{background:var(--primary-color);color:#fff;text-decoration:none}.btn-large{padding:18px 48px;font-size:18px}.hero-image{display:flex;justify-content:center;align-items:center;margin-top:60px}.app-mockup{width:300px;perspective:1000px}.mockup-screen{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:40px;padding:12px;box-shadow:0 20px 60px #0000004d;transform:rotateY(-5deg) rotateX(5deg);transition:transform .3s}.mockup-screen:hover{transform:rotateY(0) rotateX(0)}.mockup-header{height:40px;background:#ffffff1a;border-radius:28px 28px 0 0;position:relative}.mockup-notch{width:120px;height:24px;background:#000;border-radius:0 0 12px 12px;position:absolute;top:0;left:50%;transform:translate(-50%)}.mockup-content{background:#fff;border-radius:0 0 28px 28px;padding:40px 24px;min-height:400px}.expression-demo{background:var(--surface);padding:24px;border-radius:12px;margin-bottom:24px;display:flex;align-items:center;gap:12px}.math-symbol{font-size:32px;color:var(--primary-color)}.math-text{font-size:20px;font-family:Courier New,monospace;color:var(--text-primary)}.result-demo{background:#007aff1a;padding:24px;border-radius:12px;border-left:4px solid var(--primary-color)}.result-label{display:block;font-size:14px;color:var(--text-secondary);margin-bottom:8px}.result-text{font-size:18px;font-family:Courier New,monospace;color:var(--primary-color);font-weight:600}.features{padding:100px 0}.section-title{font-size:42px;font-weight:700;text-align:center;margin-bottom:16px;color:var(--text-primary)}.section-subtitle{font-size:18px;text-align:center;color:var(--text-secondary);margin-bottom:60px}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:32px}.feature-card{background:#fff;padding:32px;border-radius:16px;border:1px solid var(--border);transition:all .3s}.feature-card:hover{transform:translateY(-8px);box-shadow:0 12px 24px var(--shadow);border-color:var(--primary-color)}.feature-icon{font-size:48px;margin-bottom:16px}.feature-title{font-size:20px;font-weight:600;margin-bottom:12px;color:var(--text-primary)}.feature-description{color:var(--text-secondary);line-height:1.6}.operations{padding:80px 0;background:var(--surface)}.operations-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;max-width:900px;margin:0 auto}.operation-item{display:flex;align-items:center;gap:12px;padding:16px;background:#fff;border-radius:12px;border:1px solid var(--border)}.operation-check{color:#34c759;font-size:24px;font-weight:700}.operation-text{font-size:16px;color:var(--text-primary);font-weight:500}.cta{padding:100px 0;background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);color:#fff}.cta-content{text-align:center;max-width:700px;margin:0 auto}.cta-title{font-size:42px;font-weight:700;margin-bottom:20px}.cta-description{font-size:18px;margin-bottom:32px;opacity:.9}.cta .btn{background:#fff;color:var(--primary-color)}.cta .btn:hover{transform:translateY(-4px);box-shadow:0 12px 24px #0003}.stats{padding:80px 0}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;text-align:center}.stat-number{font-size:48px;font-weight:800;color:var(--primary-color);margin-bottom:8px}.stat-label{font-size:16px;color:var(--text-secondary);font-weight:500}@media (max-width: 768px){.hero{padding:60px 0}.hero-title{font-size:36px}.hero-description{font-size:16px}.section-title{font-size:32px}.features-grid,.operations-grid{grid-template-columns:1fr}.app-mockup{width:250px}.mockup-content{padding:30px 16px;min-height:300px}.cta-title{font-size:32px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:32px}}.support-header{padding:60px 0 40px;background:linear-gradient(135deg,#f5f7fa,#e8ecf3);text-align:center}.support-title{font-size:48px;font-weight:700;margin-bottom:16px;color:var(--text-primary)}.support-subtitle{font-size:20px;color:var(--text-secondary)}.quick-contact{padding:60px 0}.contact-card{background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);color:#fff;padding:48px;border-radius:20px;text-align:center;box-shadow:0 8px 24px var(--shadow)}.contact-card h2{font-size:32px;margin-bottom:12px}.contact-card>p{font-size:18px;opacity:.9;margin-bottom:32px}.contact-methods{display:flex;justify-content:center;gap:24px;flex-wrap:wrap}.contact-method{display:flex;align-items:center;gap:16px;background:#fff3;padding:20px 32px;border-radius:12px;text-decoration:none;color:#fff;transition:all .3s;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.contact-method:hover{background:#ffffff4d;transform:translateY(-4px);text-decoration:none}.contact-icon{font-size:32px}.contact-info{text-align:left}.contact-label{font-size:14px;opacity:.8;margin-bottom:4px}.contact-value{font-size:16px;font-weight:600}.faq-section{padding:80px 0;background:#fff}.faq-list{max-width:800px;margin:0 auto}.faq-item{background:#fff;border:1px solid var(--border);border-radius:12px;margin-bottom:16px;overflow:hidden;transition:all .3s}.faq-item:hover{border-color:var(--primary-color);box-shadow:0 4px 12px var(--shadow)}.faq-question{display:flex;justify-content:space-between;align-items:center;padding:24px;cursor:pointer;font-weight:600;font-size:18px;color:var(--text-primary);-webkit-user-select:none;user-select:none;list-style:none}.faq-question::-webkit-details-marker{display:none}.faq-icon{font-size:24px;color:var(--primary-color);transition:transform .3s}.faq-item[open] .faq-icon{transform:rotate(90deg)}.faq-answer{padding:0 24px 24px;color:var(--text-secondary);line-height:1.8;animation:fadeIn .3s ease-in-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.troubleshooting-section{padding:80px 0;background:var(--surface)}.troubleshooting-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}.troubleshooting-card{background:#fff;padding:32px;border-radius:12px;border:1px solid var(--border)}.troubleshooting-title{font-size:20px;font-weight:600;margin-bottom:16px;color:var(--text-primary)}.troubleshooting-solutions{list-style:none;padding:0;margin:0}.troubleshooting-solutions li{padding:12px 0 12px 28px;position:relative;color:var(--text-secondary);line-height:1.6}.troubleshooting-solutions li:before{content:"→";position:absolute;left:0;color:var(--primary-color);font-weight:700}.getting-started{padding:80px 0;background:#fff}.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:32px}.step-card{text-align:center;padding:32px 24px;background:var(--surface);border-radius:12px;transition:all .3s}.step-card:hover{transform:translateY(-8px);box-shadow:0 12px 24px var(--shadow)}.step-number{width:60px;height:60px;background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);color:#fff;font-size:28px;font-weight:700;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 20px}.step-card h3{font-size:20px;margin-bottom:12px;color:var(--text-primary)}.step-card p{color:var(--text-secondary);line-height:1.6}.requirements{padding:80px 0;background:var(--surface)}.requirements-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px;max-width:900px;margin:0 auto}.requirement-card{background:#fff;padding:32px;border-radius:12px;border:1px solid var(--border)}.requirement-card h3{font-size:20px;margin-bottom:16px;color:var(--text-primary)}.requirement-card ul{list-style:none;padding:0;margin:0}.requirement-card ul li{padding:8px 0;color:var(--text-secondary);line-height:1.6}.requirement-card ul li:before{content:"✓";color:#34c759;font-weight:700;margin-right:8px}.support-cta{padding:80px 0;background:#fff}.support-cta .cta-content{text-align:center;max-width:600px;margin:0 auto;padding:60px 40px;background:var(--surface);border-radius:20px}.support-cta h2{font-size:36px;margin-bottom:16px;color:var(--text-primary)}.support-cta p{font-size:18px;color:var(--text-secondary);margin-bottom:32px}@media (max-width: 768px){.support-title{font-size:36px}.support-subtitle{font-size:16px}.contact-card{padding:32px 24px}.contact-card h2{font-size:24px}.contact-methods{flex-direction:column}.contact-method{width:100%}.troubleshooting-grid,.steps-grid,.requirements-grid{grid-template-columns:1fr}.support-cta .cta-content{padding:40px 24px}.support-cta h2{font-size:28px}}.privacy-header{padding:60px 0 40px;background:linear-gradient(135deg,#f5f7fa,#e8ecf3);text-align:center}.privacy-title{font-size:48px;font-weight:700;margin-bottom:12px;color:var(--text-primary)}.privacy-date{font-size:16px;color:var(--text-secondary)}.privacy-content{padding:60px 0;background:#fff}.privacy-body{max-width:800px;margin:0 auto}.privacy-section{margin-bottom:48px}.privacy-section h2{font-size:32px;font-weight:700;margin-bottom:20px;color:var(--text-primary);padding-bottom:12px;border-bottom:2px solid var(--primary-color)}.privacy-section h3{font-size:22px;font-weight:600;margin-top:24px;margin-bottom:12px;color:var(--text-primary)}.privacy-section p{font-size:16px;line-height:1.8;color:var(--text-secondary);margin-bottom:16px}.privacy-section ul{margin:16px 0;padding-left:24px}.privacy-section ul li{font-size:16px;line-height:1.8;color:var(--text-secondary);margin-bottom:12px}.privacy-section ul li strong{color:var(--text-primary);font-weight:600}.highlight-box{background:linear-gradient(135deg,#007aff1a,#5856d61a);border-left:4px solid var(--primary-color);padding:20px 24px;border-radius:8px;margin:24px 0}.highlight-box strong{color:var(--primary-color);font-size:18px;display:block;margin-bottom:8px}.note{background:var(--surface);padding:16px 20px;border-radius:8px;font-style:italic;border-left:3px solid var(--accent-color);margin:16px 0}.privacy .contact-info{background:var(--surface);padding:24px;border-radius:12px;margin-top:20px}.privacy .contact-info p{margin-bottom:12px}.privacy .contact-info p:last-child{margin-bottom:0}.privacy .contact-info strong{color:var(--text-primary)}.privacy .contact-info a{color:var(--primary-color);text-decoration:none;font-weight:500}.privacy .contact-info a:hover{text-decoration:underline}.summary-section{background:var(--surface);padding:40px;border-radius:16px;margin-top:60px}.summary-section h2{text-align:center;margin-bottom:40px}.summary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px}.summary-card{background:#fff;padding:24px;border-radius:12px;text-align:center;border:1px solid var(--border);transition:all .3s}.summary-card:hover{transform:translateY(-4px);box-shadow:0 8px 16px var(--shadow);border-color:var(--primary-color)}.summary-icon{font-size:48px;margin-bottom:16px}.summary-card h3{font-size:18px;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.summary-card p{font-size:14px;color:var(--text-secondary);line-height:1.6;margin-bottom:0}@media (max-width: 768px){.privacy-header{padding:40px 0 30px}.privacy-title{font-size:36px}.privacy-content{padding:40px 0}.privacy-section{margin-bottom:36px}.privacy-section h2{font-size:26px}.privacy-section h3{font-size:20px}.privacy-section p,.privacy-section ul li{font-size:15px}.highlight-box{padding:16px 20px}.summary-section{padding:24px}.summary-grid{grid-template-columns:1fr;gap:16px}}@media print{.privacy-header{background:none;padding:20px 0}.highlight-box{border:1px solid #ddd;background:#f9f9f9}.summary-card{border:1px solid #ddd;page-break-inside:avoid}}*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #007AFF;--secondary-color: #5856D6;--accent-color: #FF9500;--text-primary: #1d1d1f;--text-secondary: #6e6e73;--background: #ffffff;--surface: #f5f5f7;--border: #d2d2d7;--shadow: rgba(0, 0, 0, .1)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:var(--text-primary);background-color:var(--background);line-height:1.6}#root{min-height:100vh;display:flex;flex-direction:column}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}button{cursor:pointer;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 20px}@media (max-width: 768px){.container{padding:0 16px}}