:root{--primary: #6366f1;--primary-dark: #4f46e5;--primary-light: #818cf8;--secondary: #ec4899;--accent: #06b6d4;--gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);--gradient-dark: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #1e1b4b 100%);--gradient-card: linear-gradient(135deg, rgba(99, 102, 241, .1) 0%, rgba(139, 92, 246, .1) 100%);--bg-primary: #0f0f1a;--bg-secondary: #1a1a2e;--bg-card: rgba(26, 26, 46, .8);--bg-glass: rgba(255, 255, 255, .05);--text-primary: #ffffff;--text-secondary: #a1a1aa;--text-muted: #71717a;--border-color: rgba(255, 255, 255, .1);--border-glow: rgba(99, 102, 241, .5);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 4px 16px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--shadow-glow: 0 0 40px rgba(99, 102, 241, .3);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--radius-sm: .5rem;--radius-md: .75rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-full: 9999px;--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;overflow-x:hidden}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(ellipse 80% 50% at 50% -20%,rgba(99,102,241,.15),transparent),radial-gradient(ellipse 60% 40% at 100% 100%,rgba(236,72,153,.1),transparent),radial-gradient(ellipse 40% 30% at 0% 100%,rgba(6,182,212,.1),transparent);pointer-events:none;z-index:-1}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.2}.text-gradient{background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg)}#app{min-height:100vh;display:flex;flex-direction:column}main{flex:1}.header{position:sticky;top:0;z-index:100;background:#0f0f1acc;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-color)}.header-content{display:flex;align-items:center;justify-content:space-between;height:70px}.logo{display:flex;align-items:center;gap:var(--spacing-sm);font-size:1.5rem;font-weight:800}.logo-icon{width:40px;height:40px;background:var(--gradient-primary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.25rem}.nav{display:flex;align-items:center;gap:var(--spacing-xl)}.nav-link{font-weight:500;color:var(--text-secondary);transition:color var(--transition-fast)}.nav-link:hover{color:var(--text-primary)}.hero{text-align:center;padding:var(--spacing-3xl) 0}.hero h1{font-size:clamp(2.5rem,5vw,4rem);margin-bottom:var(--spacing-lg)}.hero p{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto var(--spacing-xl)}.privacy-badge{display:inline-flex;align-items:center;gap:var(--spacing-sm);background:#22c55e1a;border:1px solid rgba(34,197,94,.3);color:#22c55e;padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-full);font-size:.875rem;font-weight:500}.privacy-badge svg{width:16px;height:16px}.tools-section{padding:var(--spacing-2xl) 0}.tools-section+.tools-section{padding-top:0}.section-header{display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);margin-bottom:var(--spacing-sm)}.section-icon{font-size:2rem}.section-title{font-size:1.75rem;margin-bottom:0;text-align:center}.section-subtitle{text-align:center;color:var(--text-secondary);margin-bottom:var(--spacing-xl)}.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--spacing-lg)}.tool-card{background:var(--bg-glass);border:1px solid var(--border-color);border-radius:var(--radius-xl);padding:var(--spacing-xl);cursor:pointer;transition:all var(--transition-normal);position:relative;overflow:hidden}.tool-card:before{content:"";position:absolute;inset:0;background:var(--gradient-card);opacity:0;transition:opacity var(--transition-normal)}.tool-card:hover{transform:translateY(-4px);border-color:var(--border-glow);box-shadow:var(--shadow-glow)}.tool-card:hover:before{opacity:1}.tool-card-content{position:relative;z-index:1}.tool-icon{width:56px;height:56px;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:var(--spacing-md)}.tool-icon.merge{background:linear-gradient(135deg,#6366f1,#8b5cf6)}.tool-icon.split{background:linear-gradient(135deg,#ec4899,#f472b6)}.tool-icon.rotate{background:linear-gradient(135deg,#06b6d4,#22d3ee)}.tool-icon.compress{background:linear-gradient(135deg,#f59e0b,#fbbf24)}.tool-icon.pdf-to-img{background:linear-gradient(135deg,#10b981,#34d399)}.tool-icon.img-to-pdf{background:linear-gradient(135deg,#8b5cf6,#a78bfa)}.tool-icon.organize{background:linear-gradient(135deg,#3b82f6,#60a5fa)}.tool-icon.watermark{background:linear-gradient(135deg,#f43f5e,#fb7185)}.tool-icon.resize{background:linear-gradient(135deg,#14b8a6,#2dd4bf)}.tool-icon.crop{background:linear-gradient(135deg,#ec4899,#f472b6)}.tool-icon.compress-img{background:linear-gradient(135deg,#f97316,#fb923c)}.tool-icon.convert{background:linear-gradient(135deg,#06b6d4,#22d3ee)}.tool-card h3{font-size:1.125rem;margin-bottom:var(--spacing-sm)}.tool-card p{color:var(--text-secondary);font-size:.875rem}.tool-page{padding:var(--spacing-2xl) 0}.tool-header{text-align:center;margin-bottom:var(--spacing-2xl)}.back-button{display:inline-flex;align-items:center;gap:var(--spacing-sm);color:var(--text-secondary);font-weight:500;margin-bottom:var(--spacing-lg);transition:color var(--transition-fast)}.back-button:hover{color:var(--text-primary)}.tool-header h1{font-size:2.5rem;margin-bottom:var(--spacing-md)}.tool-header p{color:var(--text-secondary);font-size:1.125rem}.file-uploader{background:var(--bg-glass);border:2px dashed var(--border-color);border-radius:var(--radius-xl);padding:var(--spacing-3xl);text-align:center;transition:all var(--transition-normal);cursor:pointer}.file-uploader:hover,.file-uploader.dragover{border-color:var(--primary);background:#6366f10d}.file-uploader.dragover{transform:scale(1.02)}.upload-icon{width:80px;height:80px;margin:0 auto var(--spacing-lg);background:var(--gradient-primary);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;font-size:2rem}.file-uploader h3{font-size:1.25rem;margin-bottom:var(--spacing-sm)}.file-uploader p{color:var(--text-secondary);margin-bottom:var(--spacing-lg)}.browse-btn{display:inline-flex;align-items:center;gap:var(--spacing-sm);background:var(--gradient-primary);color:#fff;padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-full);font-weight:600;transition:all var(--transition-normal)}.browse-btn:hover{transform:scale(1.05);box-shadow:var(--shadow-glow)}.file-input{display:none}.file-list{margin-top:var(--spacing-xl)}.file-item{display:flex;align-items:center;gap:var(--spacing-md);background:var(--bg-glass);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-md);margin-bottom:var(--spacing-sm)}.file-item-icon{width:48px;height:48px;background:#6366f133;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.25rem;flex-shrink:0}.file-item-info{flex:1;min-width:0}.file-item-name{font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-item-size{font-size:.875rem;color:var(--text-secondary)}.file-item-remove{width:36px;height:36px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:all var(--transition-fast)}.file-item-remove:hover{background:#f43f5e33;color:#f43f5e}.file-item.dragging{opacity:.5}.file-item-handle{cursor:grab;color:var(--text-muted);padding:var(--spacing-sm)}.file-item-handle:active{cursor:grabbing}.pdf-preview{margin-top:var(--spacing-xl)}.preview-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:var(--spacing-md)}.preview-item{background:var(--bg-glass);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-sm);cursor:pointer;transition:all var(--transition-normal)}.preview-item:hover{border-color:var(--primary)}.preview-item.selected{border-color:var(--primary);box-shadow:0 0 0 2px var(--primary)}.preview-canvas{width:100%;aspect-ratio:3/4;background:#fff;border-radius:var(--radius-sm);object-fit:contain}.preview-page-num{text-align:center;font-size:.875rem;color:var(--text-secondary);margin-top:var(--spacing-sm)}.action-bar{display:flex;justify-content:center;gap:var(--spacing-md);margin-top:var(--spacing-2xl);flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-full);font-weight:600;font-size:1rem;transition:all var(--transition-normal);min-width:160px}.btn-primary{background:var(--gradient-primary);color:#fff}.btn-primary:hover:not(:disabled){transform:scale(1.05);box-shadow:var(--shadow-glow)}.btn-secondary{background:var(--bg-glass);border:1px solid var(--border-color);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){border-color:var(--primary);background:#6366f11a}.btn:disabled{opacity:.5;cursor:not-allowed}.progress-container{margin-top:var(--spacing-xl)}.progress-bar{height:8px;background:var(--bg-glass);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:var(--gradient-primary);border-radius:var(--radius-full);transition:width var(--transition-normal)}.progress-text{text-align:center;margin-top:var(--spacing-sm);color:var(--text-secondary);font-size:.875rem}.result-section{text-align:center;padding:var(--spacing-2xl);background:var(--bg-glass);border:1px solid var(--border-color);border-radius:var(--radius-xl);margin-top:var(--spacing-2xl)}.result-icon{width:80px;height:80px;margin:0 auto var(--spacing-lg);background:linear-gradient(135deg,#22c55e,#4ade80);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:2.5rem}.result-section h2{margin-bottom:var(--spacing-md)}.result-section p{color:var(--text-secondary);margin-bottom:var(--spacing-xl)}.options-panel{background:var(--bg-glass);border:1px solid var(--border-color);border-radius:var(--radius-xl);padding:var(--spacing-xl);margin-top:var(--spacing-xl)}.options-title{font-size:1.125rem;margin-bottom:var(--spacing-lg)}.option-group{margin-bottom:var(--spacing-lg)}.option-group:last-child{margin-bottom:0}.option-label{display:block;font-weight:500;margin-bottom:var(--spacing-sm)}.option-input{width:100%;padding:var(--spacing-md);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);font-size:1rem;transition:border-color var(--transition-fast)}.option-input:focus{outline:none;border-color:var(--primary)}.option-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%23a1a1aa' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:40px}.option-row{display:flex;gap:var(--spacing-md)}.option-row .option-group{flex:1}.option-buttons{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.option-btn{padding:var(--spacing-sm) var(--spacing-lg);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-secondary);font-weight:500;transition:all var(--transition-fast)}.option-btn:hover{border-color:var(--primary);color:var(--text-primary)}.option-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}.compression-levels{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}.compression-card{position:relative;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--spacing-lg);cursor:pointer;transition:all var(--transition-normal);text-align:center}.compression-card:hover{border-color:var(--primary-light);transform:translateY(-2px)}.compression-card.active{border-color:var(--primary);background:#6366f11a;box-shadow:0 0 20px #6366f133}.compression-icon{font-size:2rem;margin-bottom:var(--spacing-sm)}.compression-info h4{font-size:1rem;margin-bottom:var(--spacing-xs)}.compression-info p{font-size:.75rem;color:var(--text-secondary);margin-bottom:var(--spacing-sm)}.compression-badge{display:inline-block;font-size:.75rem;font-weight:600;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--radius-full)}.compression-badge.quality{background:#22c55e33;color:#22c55e}.compression-badge.balanced{background:#6366f133;color:var(--primary-light)}.compression-badge.size{background:#f9731633;color:#f97316}.recommended-badge{position:absolute;top:-10px;right:10px;background:var(--gradient-primary);color:#fff;font-size:.625rem;font-weight:700;text-transform:uppercase;padding:4px 8px;border-radius:var(--radius-full)}.compression-preview{display:flex;align-items:center;justify-content:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--radius-md)}.preview-label{font-size:.875rem;color:var(--text-secondary)}.preview-sizes{display:flex;align-items:center;gap:var(--spacing-sm)}.preview-sizes .original-size{color:var(--text-muted);text-decoration:line-through}.preview-sizes .arrow{color:var(--text-muted)}.preview-sizes .estimated-size{color:#22c55e;font-weight:600}.footer{background:var(--bg-secondary);border-top:1px solid var(--border-color);padding:var(--spacing-2xl) 0;margin-top:auto}.footer-content{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--spacing-lg)}.footer-brand{display:flex;align-items:center;gap:var(--spacing-sm);font-weight:600}.footer-text{color:var(--text-secondary);font-size:.875rem}.footer-links{display:flex;gap:var(--spacing-lg)}.footer-link{color:var(--text-secondary);font-size:.875rem;transition:color var(--transition-fast)}.footer-link:hover{color:var(--text-primary)}.spinner{width:24px;height:24px;border:3px solid var(--border-color);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:768px){.header-content{height:60px}.nav{display:none}.hero{padding:var(--spacing-2xl) 0}.tools-grid{grid-template-columns:1fr}.file-uploader{padding:var(--spacing-2xl)}.action-bar{flex-direction:column}.btn{width:100%}.option-row{flex-direction:column}.footer-content{flex-direction:column;text-align:center}}.hidden{display:none!important}.fade-in{animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}