.container{max-width:1200px;margin:0 auto;padding:0 24px}.nav{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-color);z-index:1000;padding:16px 0;transition:box-shadow .3s}.nav.scrolled{box-shadow:var(--shadow-md)}.nav-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:8px;font-size:20px;font-weight:700;color:var(--text-primary);text-decoration:none}.logo-icon{font-size:24px}.nav-links{display:flex;gap:32px}.nav-link{color:var(--text-secondary);text-decoration:none;font-weight:500;transition:color .2s}.nav-link:hover{color:var(--primary-color)}.hero{padding:120px 0 80px;background:linear-gradient(135deg,#f9fafb,#fff);min-height:90vh;display:flex;align-items:center}.hero .container{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.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(--gradient-start),var(--gradient-end));-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-cta{display:flex;gap:16px;margin-bottom:48px}.btn{padding:14px 28px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s;border:none;font-family:inherit}.btn-primary{background:linear-gradient(135deg,var(--gradient-start),var(--gradient-end));color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-secondary{background:#fff;color:var(--primary-color);border:2px solid var(--primary-color)}.btn-secondary:hover{background:var(--primary-color);color:#fff}.btn-large{padding:18px 36px;font-size:18px}.hero-stats{display:flex;gap:48px}.stat{text-align:left}.stat-number{font-size:32px;font-weight:700;color:var(--primary-color);margin-bottom:4px}.stat-label{font-size:14px;color:var(--text-secondary)}.hero-visual{display:flex;justify-content:center;align-items:center}.card-preview{background:#fff;border-radius:16px;padding:24px;box-shadow:var(--shadow-xl);max-width:400px;width:100%;border:1px solid var(--border-color);animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;padding-bottom:16px;border-bottom:1px solid var(--border-color)}.card-badge{background:var(--bg-tertiary);padding:4px 12px;border-radius:6px;font-size:12px;font-weight:600;color:var(--text-secondary)}.card-difficulty{padding:4px 12px;border-radius:6px;font-size:12px;font-weight:600}.card-difficulty.easy{background:#d1fae5;color:#065f46}.card-content h3{font-size:20px;font-weight:700;margin-bottom:12px;color:var(--text-primary)}.card-content p{color:var(--text-secondary);margin-bottom:16px;line-height:1.6}.card-solution{background:var(--bg-secondary);padding:12px;border-radius:8px;border-left:3px solid var(--primary-color)}.card-solution code{font-family:Monaco,Courier New,monospace;font-size:14px;color:var(--text-primary)}.features{padding:100px 0;background:var(--bg-primary)}.section-title{font-size:42px;font-weight:800;text-align:center;margin-bottom:64px;color:var(--text-primary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:32px}.feature-card{background:#fff;padding:32px;border-radius:16px;border:1px solid var(--border-color);transition:all .3s;opacity:0;transform:translateY(20px)}.feature-card.visible{opacity:1;transform:translateY(0)}.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--primary-color)}.feature-icon{font-size:48px;margin-bottom:16px}.feature-title{font-size:20px;font-weight:700;margin-bottom:12px;color:var(--text-primary)}.feature-description{color:var(--text-secondary);line-height:1.6}.how-it-works{padding:100px 0;background:var(--bg-secondary)}.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:48px;max-width:1000px;margin:0 auto}.step{display:flex;gap:24px;align-items:flex-start;opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}.step.visible{opacity:1;transform:translateY(0)}.step-number{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--gradient-start),var(--gradient-end));color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;flex-shrink:0}.step-content{flex:1}.step-title{font-size:20px;font-weight:700;margin-bottom:8px;color:var(--text-primary)}.step-description{color:var(--text-secondary);line-height:1.6}.cta-section{padding:100px 0;background:linear-gradient(135deg,var(--gradient-start),var(--gradient-end));color:#fff}.cta-content{text-align:center;max-width:600px;margin:0 auto}.cta-title{font-size:42px;font-weight:800;margin-bottom:16px}.cta-description{font-size:20px;margin-bottom:32px;opacity:.9}.cta-section .btn-primary{background:#fff;color:var(--primary-color)}.cta-section .btn-primary:hover{background:var(--bg-secondary);transform:translateY(-2px)}.footer{background:var(--text-primary);color:#fff;padding:64px 0 32px}.footer-content{display:grid;grid-template-columns:2fr 3fr;gap:64px;margin-bottom:48px}.footer-brand .logo{color:#fff;margin-bottom:16px}.footer-tagline{color:#ffffffb3;font-size:14px}.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.footer-heading{font-size:16px;font-weight:700;margin-bottom:16px}.footer-link{display:block;color:#ffffffb3;text-decoration:none;margin-bottom:12px;transition:color .2s}.footer-link:hover{color:#fff}.footer-bottom{text-align:center;padding-top:32px;border-top:1px solid rgba(255,255,255,.1);color:#ffffffb3;font-size:14px}@media (max-width: 968px){.hero .container{grid-template-columns:1fr;text-align:center}.hero-visual{order:-1}.hero-title{font-size:42px}.hero-cta,.hero-stats{justify-content:center}.footer-content{grid-template-columns:1fr}.footer-links{grid-template-columns:repeat(2,1fr)}}@media (max-width: 640px){.nav-links{gap:16px}.hero{padding:100px 0 60px}.hero-title{font-size:32px}.hero-description{font-size:18px}.hero-cta{flex-direction:column}.btn{width:100%}.hero-stats{flex-direction:column;gap:24px}.section-title{font-size:32px}.features-grid,.steps,.footer-links{grid-template-columns:1fr}}*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #6366f1;--primary-dark: #4f46e5;--secondary-color: #8b5cf6;--text-primary: #1f2937;--text-secondary: #6b7280;--bg-primary: #ffffff;--bg-secondary: #f9fafb;--bg-tertiary: #f3f4f6;--border-color: #e5e7eb;--gradient-start: #6366f1;--gradient-end: #8b5cf6;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:var(--text-primary);line-height:1.6;overflow-x:hidden}html{scroll-behavior:smooth}::selection{background:var(--primary-color);color:#fff}