:root{--color-primary: #6366f1;--color-primary-hover: #4f46e5;--color-secondary: #ec4899;--bg-app: #0f172a;--bg-panel: rgba(30, 41, 59, .7);--bg-card: rgba(51, 65, 85, .5);--bg-surface: #1e293b;--text-main: #f8fafc;--text-muted: #94a3b8;--text-inverse: #0f172a;--border-color: rgba(148, 163, 184, .1);--border-hover: rgba(148, 163, 184, .3);--glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, .37);--glass-border: 1px solid rgba(255, 255, 255, .1);--backdrop-blur: 12px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--transition-fast: .2s cubic-bezier(.4, 0, .2, 1);--transition-smooth: .4s cubic-bezier(.4, 0, .2, 1);--font-sans: "Inter", system-ui, -apple-system, sans-serif}body{background-color:var(--bg-app);color:var(--text-main);font-family:var(--font-sans);margin:0;min-height:100vh;background-image:radial-gradient(at 0% 0%,hsla(253,16%,7%,1) 0,transparent 50%),radial-gradient(at 50% 0%,hsla(225,39%,30%,1) 0,transparent 50%),radial-gradient(at 100% 0%,hsla(339,49%,30%,1) 0,transparent 50%)}*{box-sizing:border-box}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-app)}::-webkit-scrollbar-thumb{background:var(--bg-card);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--color-primary)}.container{max-width:1200px;margin:0 auto;padding:2rem;min-height:100vh;display:flex;flex-direction:column}.title{font-size:3.5rem;font-weight:800;text-align:center;margin-bottom:2rem;background:linear-gradient(to right,#818cf8,#e879f9);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.05em}.btn{background:var(--color-primary);color:#fff;padding:.75rem 1.5rem;border-radius:var(--radius-md);border:none;font-weight:600;cursor:pointer;transition:var(--transition-fast);display:inline-flex;align-items:center;gap:.5rem}.btn:hover{background:var(--color-primary-hover);transform:translateY(-1px)}.glass-panel{background:var(--bg-panel);backdrop-filter:blur(var(--backdrop-blur));-webkit-backdrop-filter:blur(var(--backdrop-blur));border:var(--glass-border);box-shadow:var(--glass-shadow);border-radius:var(--radius-lg)}.file-uploader-container{width:100%;max-width:600px;margin:0 auto}.drop-zone{border:2px dashed var(--border-color);border-radius:var(--radius-lg);padding:4rem 2rem;text-align:center;cursor:pointer;background-color:var(--bg-card);-webkit-backdrop-filter:blur(var(--backdrop-blur));backdrop-filter:blur(var(--backdrop-blur));transition:all var(--transition-smooth);display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;overflow:hidden}.drop-zone:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at center,rgba(99,102,241,.1) 0%,transparent 70%);opacity:0;transition:opacity .3s ease}.drop-zone:hover:before{opacity:1}.upload-content{z-index:1;display:flex;flex-direction:column;align-items:center;gap:1rem}.upload-title{font-size:1.5rem;font-weight:700;margin:0;color:var(--text-main)}.upload-subtitle{font-size:1rem;color:var(--text-muted);margin:0}.thumbnail-container{width:200px;height:280px;position:relative;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s ease;background:var(--bg-surface);box-shadow:0 4px 6px -1px #0000001a;overflow:hidden;border:2px solid transparent}.thumbnail-container:hover{transform:translateY(-4px);box-shadow:0 10px 15px -3px #0000001a}.thumbnail-container.selected{border-color:var(--selection-color);box-shadow:0 0 0 4px var(--bg-app),0 0 0 6px var(--selection-color)}.thumbnail-wrapper{width:100%;height:100%;display:flex;justify-content:center;align-items:center;position:relative}.pdf-document{width:100%;height:100%;display:flex;justify-content:center;align-items:center;overflow:hidden}.pdf-page canvas{width:100%!important;height:auto!important;object-fit:contain}.thumbnail-loading{display:flex;justify-content:center;align-items:center;height:100%;width:100%}.selection-overlay{position:absolute;top:8px;right:8px;z-index:10;opacity:0;transition:opacity .2s ease}.thumbnail-container:hover .selection-overlay,.thumbnail-container.selected .selection-overlay{opacity:1}.page-number-badge{position:absolute;bottom:8px;right:8px;background:#0009;color:#fff;padding:2px 6px;border-radius:4px;font-size:12px;font-weight:500;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.pdf-editor-container{width:100%;padding:2rem 0}.editor-grid{display:flex;flex-wrap:wrap;gap:2rem;justify-content:center;list-style:none;padding:0;margin:0}.editor-item{position:relative;z-index:1}.editor-item:active{z-index:10;cursor:grabbing}.control-panel{position:fixed;bottom:2rem;left:50%;transform:translate(-50%);display:flex;align-items:center;gap:2rem;padding:1rem 2rem;z-index:100;max-width:90vw}.panel-group{display:flex;align-items:center;gap:1rem}.divider{width:1px;height:24px;background-color:var(--border-color)}.icon-btn{background:transparent;border:none;color:var(--text-muted);cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:4px;font-size:.75rem;padding:.5rem;border-radius:var(--radius-sm);transition:all var(--transition-fast)}.icon-btn:hover:not(:disabled){background:#ffffff0d;color:var(--text-main)}.icon-btn:disabled{opacity:.5;cursor:not-allowed}.merge-btn{padding:.75rem 2rem;font-size:1rem;box-shadow:0 4px 12px #6366f14d}.merge-btn:hover:not(:disabled){box-shadow:0 6px 16px #6366f180}@media(max-width:768px){.control-panel{bottom:1rem;padding:.75rem 1rem;gap:1rem;flex-wrap:wrap;justify-content:center}.icon-btn span{display:none}}.modal-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:9999;display:flex;justify-content:center;align-items:center;padding:1rem}.modal-content{width:100%;max-width:400px;background:var(--bg-surface);border:1px solid var(--border-color);padding:1.5rem;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a}.modal-header{display:flex;align-items:center;gap:1rem;margin-bottom:1rem}.icon-wrapper{background:#f59e0b1a;padding:8px;border-radius:50%;display:flex;align-items:center;justify-content:center}.modal-header h3{margin:0;flex:1;font-size:1.25rem;color:var(--text-main)}.close-btn{background:transparent;border:none;color:var(--text-muted);cursor:pointer;padding:4px;border-radius:4px;display:flex;align-items:center;justify-content:center;transition:background .2s}.close-btn:hover{background:#ffffff1a;color:var(--text-main)}.modal-message{color:var(--text-muted);line-height:1.5;margin-top:0;margin-bottom:2rem}.modal-actions{display:flex;justify-content:flex-end;gap:1rem}.btn-secondary{background:transparent;border:1px solid var(--border-color);color:var(--text-main);padding:.5rem 1rem;border-radius:var(--radius-sm);cursor:pointer;font-weight:500;transition:all .2s}.btn-secondary:hover{background:#ffffff0d}.btn-danger{background:#ef4444;border:none;color:#fff;padding:.5rem 1rem;border-radius:var(--radius-sm);cursor:pointer;font-weight:500;transition:all .2s}.btn-danger:hover{background:#dc2626;transform:translateY(-1px)}