:root{--bg-color: #0a0a0a;--text-primary: #f5f5f7;--text-secondary: #a1a1a6;--accent-color: #0071e3;--accent-hover: #0077ed;--glass-bg: rgba(255, 255, 255, .05);--glass-border: rgba(255, 255, 255, .1);--hero-gradient: linear-gradient(135deg, #0071e3 0%, #4facfe 100%)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--accent-color);text-decoration:none;transition:color .2s ease}a:hover{color:var(--accent-hover)}.app-container{min-height:100vh;display:flex;flex-direction:column}.header{display:flex;justify-content:space-between;align-items:center;padding:1.5rem 2rem;background:#0a0a0acc;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);position:sticky;top:0;z-index:100;border-bottom:1px solid var(--glass-border)}.logo{font-size:1.5rem;font-weight:700;background:var(--hero-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.lang-switch button{background:transparent;border:1px solid var(--glass-border);color:var(--text-secondary);padding:.5rem 1rem;border-radius:20px;cursor:pointer;font-family:Inter,sans-serif;transition:all .2s ease}.lang-switch button:hover{background:var(--glass-bg);color:var(--text-primary)}.hero{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:6rem 2rem}.hero h1{font-size:4rem;font-weight:700;margin-bottom:1rem;letter-spacing:-.05em}.hero p{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin-bottom:3rem}.download-section{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap;width:100%;max-width:1000px}.download-card{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:16px;padding:2rem;flex:1;min-width:280px;display:flex;flex-direction:column;align-items:center;transition:transform .3s ease}.download-card:hover{transform:translateY(-5px);background:#ffffff14}.download-card.disabled{opacity:.6}.download-card.disabled:hover{transform:none;background:var(--glass-bg)}.download-card h3{font-size:1.5rem;margin-bottom:.5rem;color:var(--text-primary)}.download-card .req{font-size:.9rem;color:var(--text-secondary);margin-bottom:1.5rem;text-align:center}.download-buttons{display:flex;flex-direction:column;gap:1rem;width:100%}.download-buttons .btn{width:100%;justify-content:center}.btn{display:inline-flex;align-items:center;gap:.75rem;padding:.875rem 2rem;border-radius:30px;font-size:1.1rem;font-weight:500;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;border:none;color:#fff}.btn.primary{background:var(--hero-gradient);box-shadow:0 4px 14px #0071e366}.btn.primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #0071e399}.btn.secondary{background:var(--glass-bg);border:1px solid var(--glass-border);color:var(--text-primary)}.btn.secondary:hover{background:#ffffff1a;transform:translateY(-2px)}.showcase{margin-top:4rem;width:100%;max-width:1000px;border-radius:12px;overflow:hidden;box-shadow:0 20px 40px #00000080;border:1px solid var(--glass-border);aspect-ratio:16/9;background:#111;display:flex;align-items:center;justify-content:center;position:relative}.showcase-img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:contain;opacity:0;transition:opacity 1.2s cubic-bezier(.4,0,.2,1);z-index:1}.showcase-img.active{opacity:1;z-index:2}.placeholder-content{position:absolute;z-index:0;color:var(--text-secondary);font-size:1.2rem;text-align:center;display:flex;flex-direction:column;gap:.5rem}.showcase.fallback-mode .placeholder-content{z-index:3}.features{padding:6rem 2rem;max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem}.feature-card{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:16px;padding:2.5rem 2rem;transition:transform .3s ease,background .3s ease}.feature-card:hover{transform:translateY(-5px);background:#ffffff14}.feature-card h3{font-size:1.5rem;margin-bottom:1rem;color:var(--text-primary)}.feature-card p{color:var(--text-secondary)}.footer{text-align:center;padding:2rem;color:var(--text-secondary);border-top:1px solid var(--glass-border);font-size:.9rem}@media(max-width:768px){.hero h1{font-size:2.5rem}.header{padding:1rem}.features{padding:4rem 1rem}}