:root{--primary-color: #4F46E5;--primary-hover: #4338CA;--primary-color-alpha: rgba(79, 70, 229, .1);--secondary-color: #10B981;--accent-color: #F59E0B;--background-color: #F9FAFB;--card-background: #FFFFFF;--text-primary: #111827;--text-secondary: #6B7280;--text-tertiary: #9CA3AF;--bg-secondary: #F3F4F6;--bg-tertiary: #F9FAFB;--border-color: #E5E7EB;--error-color: #EF4444;--success-color: #10B981;--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);--radius-sm: 6px;--radius-md: 12px;--radius-lg: 16px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Pretendard,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:var(--background-color);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;background:none;font-family:inherit}.container{max-width:1200px;margin:0 auto;padding:0 20px}.header{background:var(--card-background);border-bottom:1px solid var(--border-color);padding:16px 0;position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:10px;font-size:1.5rem;font-weight:700;color:var(--primary-color)}.logo-icon{width:36px;height:36px}.nav{display:flex;gap:8px}.nav-link{padding:8px 16px;border-radius:var(--radius-sm);font-weight:500;transition:all .2s;color:var(--text-secondary)}.nav-link:hover{background:var(--background-color);color:var(--primary-color)}.nav-link.active{background:var(--primary-color);color:#fff}.language-selector{display:flex;gap:4px;margin-left:16px;padding-left:16px;border-left:1px solid var(--border-color)}.lang-btn{padding:6px 10px;border-radius:var(--radius-sm);font-size:.75rem;font-weight:600;color:var(--text-secondary);background:transparent;border:1px solid var(--border-color);cursor:pointer;transition:all .2s}.lang-btn:hover{border-color:var(--primary-color);color:var(--primary-color)}.lang-btn.active{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.main{min-height:calc(100vh - 140px);padding:40px 0}.page-header{text-align:center;margin-bottom:40px}.page-title{font-size:2.5rem;font-weight:800;margin-bottom:12px;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.page-description{font-size:1.125rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.converter-card{background:var(--card-background);border-radius:var(--radius-lg);padding:40px;box-shadow:var(--shadow-lg);max-width:800px;margin:0 auto}.drop-zone{border:2px dashed var(--border-color);border-radius:var(--radius-md);padding:60px 40px;text-align:center;transition:all .3s;cursor:pointer;background:var(--background-color)}.drop-zone:hover,.drop-zone.active{border-color:var(--primary-color);background:#4f46e50d}.drop-zone-icon{width:64px;height:64px;margin:0 auto 16px;color:var(--primary-color)}.drop-zone-title{font-size:1.25rem;font-weight:600;margin-bottom:8px}.drop-zone-subtitle{color:var(--text-secondary);margin-bottom:16px}.drop-zone-button{background:var(--primary-color);color:#fff;padding:12px 24px;border-radius:var(--radius-sm);font-weight:600;transition:background .2s}.drop-zone-button:hover{background:var(--primary-hover)}.drop-zone.has-error{border-color:var(--error-color);background:#ef44440d}.drop-zone-wrapper{width:100%}.drop-zone-error{display:flex;align-items:center;gap:8px;margin-top:12px;padding:12px 16px;background:#ef44441a;border:1px solid var(--error-color);border-radius:var(--radius-sm);color:var(--error-color);font-size:.875rem;font-weight:500;animation:shake .5s ease-in-out}.drop-zone-error svg{flex-shrink:0}@keyframes shake{0%,to{transform:translate(0)}10%,30%,50%,70%,90%{transform:translate(-4px)}20%,40%,60%,80%{transform:translate(4px)}}.file-preview{margin-top:24px;padding:20px;background:var(--background-color);border-radius:var(--radius-md)}.file-info{display:flex;align-items:center;gap:12px;margin-bottom:16px}.file-icon{width:48px;height:48px;background:var(--primary-color);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:#fff}.file-details h4{font-weight:600;margin-bottom:4px;word-break:break-all}.file-details span{font-size:.875rem;color:var(--text-secondary)}.preview-image{max-width:100%;max-height:300px;border-radius:var(--radius-sm);margin-top:16px;object-fit:contain}.options{margin-top:24px;padding:20px;background:var(--background-color);border-radius:var(--radius-md)}.options-title{font-weight:600;margin-bottom:16px;display:flex;align-items:center;gap:8px}.option-group{margin-bottom:16px}.option-group:last-child{margin-bottom:0}.option-label{display:block;font-size:.875rem;font-weight:500;margin-bottom:8px;color:var(--text-secondary)}.option-select{width:100%;padding:12px 16px;border:1px solid var(--border-color);border-radius:var(--radius-sm);font-size:1rem;background:var(--card-background);transition:border-color .2s}.option-select:focus{outline:none;border-color:var(--primary-color)}.option-slider{width:100%;margin-top:8px}.convert-button{width:100%;padding:16px 32px;background:linear-gradient(135deg,var(--primary-color),#7C3AED);color:#fff;font-size:1.125rem;font-weight:600;border-radius:var(--radius-md);margin-top:24px;transition:transform .2s,box-shadow .2s}.convert-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 20px #4f46e566}.convert-button:disabled{opacity:.5;cursor:not-allowed}.progress-container{margin-top:24px}.progress-bar{height:8px;background:var(--border-color);border-radius:4px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color));transition:width .3s}.progress-text{text-align:center;margin-top:8px;font-size:.875rem;color:var(--text-secondary)}.result{margin-top:24px;padding:20px;background:#10b9811a;border:1px solid var(--success-color);border-radius:var(--radius-md)}.result-title{display:flex;align-items:center;gap:8px;font-weight:600;color:var(--success-color);margin-bottom:16px}.download-button{width:100%;padding:14px 24px;background:var(--success-color);color:#fff;font-weight:600;border-radius:var(--radius-sm);transition:background .2s}.download-button:hover{background:#059669}.error{margin-top:24px;padding:16px;background:#ef44441a;border:1px solid var(--error-color);border-radius:var(--radius-md);color:var(--error-color);display:flex;align-items:center;gap:8px}.footer{background:var(--card-background);border-top:1px solid var(--border-color);padding:24px 0;text-align:center}.footer-text{color:var(--text-secondary);font-size:.875rem}.footer-highlight{color:var(--primary-color);font-weight:600}.footer-contact{margin-top:8px;font-size:.85rem;color:var(--text-secondary)}.footer-contact a{color:var(--primary-color);text-decoration:none}.footer-contact a:hover{text-decoration:underline}.hero{text-align:center;padding:60px 0}.hero-title{font-size:3rem;font-weight:800;margin-bottom:16px;line-height:1.2}.hero-subtitle{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto 32px}.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;background:#10b9811a;color:var(--success-color);border-radius:20px;font-size:.875rem;font-weight:500;margin-bottom:24px}.categories{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:24px;margin-top:40px}.category-card{background:var(--card-background);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow-md);transition:transform .2s,box-shadow .2s}.category-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.category-icon{width:56px;height:56px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;margin-bottom:20px;font-size:1.75rem}.category-icon.image{background:#4f46e51a}.category-icon.document{background:#10b9811a}.category-icon.media{background:#f59e0b1a}.category-icon.pdf{background:#ef44441a}.category-icon.games{background:#8b5cf61a}.category-title{font-size:1.25rem;font-weight:700;margin-bottom:8px}.category-description{color:var(--text-secondary);font-size:.9375rem;margin-bottom:20px}.converter-list{display:flex;flex-wrap:wrap;gap:8px}.converter-tag{padding:6px 12px;background:var(--background-color);border-radius:20px;font-size:.8125rem;font-weight:500;color:var(--text-secondary);transition:all .2s}.converter-tag:hover{background:var(--primary-color);color:#fff}.seo-content{margin-top:60px;padding:40px;background:var(--card-background);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.seo-content h2{font-size:1.5rem;margin-bottom:16px}.seo-content p{color:var(--text-secondary);margin-bottom:16px;line-height:1.8}.seo-content ul{color:var(--text-secondary);margin-left:20px;margin-bottom:16px}.seo-content li{margin-bottom:8px}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:24px;margin-top:40px}.feature{text-align:center;padding:24px}.feature-icon{width:48px;height:48px;margin:0 auto 16px;color:var(--primary-color)}.feature-title{font-weight:600;margin-bottom:8px}.feature-text{color:var(--text-secondary);font-size:.9375rem}@media(max-width:768px){.header-content{flex-direction:column;gap:16px}.nav{flex-wrap:wrap;justify-content:center}.hero-title{font-size:2rem}.page-title{font-size:1.75rem}.converter-card{padding:24px}.drop-zone{padding:40px 20px}.categories{grid-template-columns:1fr}}