:root{--bg-color: #0f172a;--surface-color: rgba(30, 41, 59, .7);--primary-color: #3b82f6;--primary-hover: #2563eb;--accent-color: #8b5cf6;--text-primary: #f8fafc;--text-secondary: #94a3b8;--border-color: rgba(255, 255, 255, .1);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, .37)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-primary);line-height:1.6;min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden;background-image:radial-gradient(circle at 15% 50%,rgba(59,130,246,.15),transparent 25%),radial-gradient(circle at 85% 30%,rgba(139,92,246,.15),transparent 25%)}header{padding:1.5rem 5%;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--border-color);background:#0f172acc;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);position:sticky;top:0;z-index:100}.logo{font-size:1.5rem;font-weight:700;text-decoration:none;color:var(--text-primary);display:flex;align-items:center;gap:.5rem}.logo span{background:linear-gradient(135deg,var(--primary-color),var(--accent-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent}nav ul{display:flex;list-style:none;gap:2rem}nav a{color:var(--text-secondary);text-decoration:none;font-weight:500;transition:color .3s ease}nav a:hover,nav a.active{color:var(--text-primary)}main{flex:1;padding:4rem 5%;max-width:1200px;margin:0 auto;width:100%}.hero{text-align:center;margin-bottom:4rem}.hero h1{font-size:3.5rem;font-weight:800;margin-bottom:1rem;line-height:1.2}.hero p{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.converter-card{background:var(--surface-color);border:1px solid var(--border-color);border-radius:24px;padding:3rem;box-shadow:var(--glass-shadow);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);text-align:center;margin-bottom:4rem;transition:transform .3s ease,box-shadow .3s ease}.converter-card:hover{transform:translateY(-2px);box-shadow:0 12px 40px #00000073}.drop-zone{border:2px dashed var(--border-color);border-radius:16px;padding:4rem 2rem;cursor:pointer;transition:all .3s ease;background:#ffffff05}.drop-zone:hover,.drop-zone.dragover{border-color:var(--primary-color);background:#3b82f60d}.drop-icon{font-size:3rem;margin-bottom:1rem;color:var(--primary-color)}.btn{display:inline-block;background:linear-gradient(135deg,var(--primary-color),var(--accent-color));color:#fff;padding:.75rem 2rem;border-radius:9999px;font-weight:600;text-decoration:none;border:none;cursor:pointer;transition:opacity .3s ease,transform .2s ease;font-family:var(--font-family);font-size:1rem;margin-top:1.5rem}.btn:hover{opacity:.9;transform:scale(1.02)}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-bottom:4rem}.feature-card{background:#1e293b66;border:1px solid var(--border-color);border-radius:16px;padding:2rem;transition:transform .3s ease}.feature-card:hover{transform:translateY(-5px);background:#1e293b99}.feature-icon{font-size:2rem;margin-bottom:1rem;background:linear-gradient(135deg,var(--primary-color),var(--accent-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent}.feature-card h3{font-size:1.25rem;margin-bottom:.5rem}.feature-card p{color:var(--text-secondary)}.seo-content{background:var(--surface-color);border:1px solid var(--border-color);border-radius:24px;padding:3rem;margin-bottom:4rem}.seo-content h2{font-size:2rem;margin-bottom:1.5rem;color:var(--primary-color)}.seo-content p,.seo-content ul{margin-bottom:1rem;color:var(--text-secondary)}.seo-content ul{padding-left:1.5rem}.seo-content li{margin-bottom:.5rem}footer{text-align:center;padding:2rem;border-top:1px solid var(--border-color);color:var(--text-secondary);background:#0f172acc}.footer-links{margin-top:1rem;display:flex;justify-content:center;gap:1.5rem}.footer-links a{color:var(--text-secondary);text-decoration:none;font-size:.875rem;transition:color .3s}.footer-links a:hover{color:var(--text-primary)}@media (max-width: 768px){.hero h1{font-size:2.5rem}nav ul{display:none}}