:root{--primary-color:#e5322d;--primary-hover:#c42a26;--primary-light:#fed7d7;--secondary-color:#2d3748;--accent-color:#48bb78;--background-color:#f7fafc;--bg-secondary:#f1f5f9;--bg-tertiary:#e2e8f0;--card-background:#fff;--text-color:#2d3748;--text-muted:#718096;--text-inverted:#fff;--border-color:#e2e8f0;--shadow-sm:0 1px 2px 0 rgba(0,0,0,.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--transition:all .2s ease;--upload-bg:#fafbfc;--upload-hover-bg:#fff5f5}:root.dark{--secondary-color:#f7fafc;--background-color:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--card-background:#1e293b;--text-color:#f1f5f9;--text-muted:#94a3b8;--text-inverted:#0f172a;--border-color:#334155;--shadow-sm:0 1px 2px 0 rgba(0,0,0,.2);--shadow-md:0 4px 6px -1px rgba(0,0,0,.3),0 2px 4px -1px rgba(0,0,0,.2);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.4),0 4px 6px -2px rgba(0,0,0,.2);--upload-bg:#1e293b;--upload-hover-bg:#2d1e1e}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{background-color:var(--background-color);color:var(--text-color);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;line-height:1.6;min-height:100vh}a{color:inherit;text-decoration:none}img{height:auto;max-width:100%}.container{margin:0 auto;max-width:1400px;padding:0 20px;width:100%}.page-wrapper{min-height:calc(100vh - 160px);padding:40px 0}.page-title{color:var(--secondary-color);font-size:2.5rem;font-weight:700;margin-bottom:1rem;text-align:center}.page-subtitle{color:var(--text-muted);font-size:1.125rem;margin-bottom:2rem;text-align:center}.section-title{color:var(--secondary-color);font-size:1.5rem;font-weight:600;margin-bottom:1.5rem}.btn{align-items:center;border:none;border-radius:var(--radius-md);cursor:pointer;display:inline-flex;font-size:1rem;font-weight:600;gap:8px;justify-content:center;padding:12px 24px;text-decoration:none;transition:var(--transition)}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:var(--primary-hover);box-shadow:var(--shadow-md);transform:translateY(-2px)}.btn-secondary{background-color:var(--secondary-color);color:#fff}.btn-secondary:hover{background-color:#1a202c;transform:translateY(-2px)}.btn-outline{background-color:transparent;border:2px solid var(--primary-color);color:var(--primary-color)}.btn-outline:hover{background-color:var(--primary-color);color:#fff}.btn-lg{font-size:1.125rem;padding:16px 32px}.btn:disabled{cursor:not-allowed;opacity:.6;transform:none}.card{background:var(--card-background);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:24px;transition:var(--transition)}.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}.tools-grid{display:grid;gap:24px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));margin-top:2rem}.tool-card{background:var(--card-background);border:2px solid transparent;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);cursor:pointer;padding:28px;text-align:center;transition:var(--transition)}.tool-card:hover{border-color:var(--primary-color);box-shadow:var(--shadow-lg);transform:translateY(-6px)}.tool-card-icon{align-items:center;border-radius:var(--radius-md);display:flex;font-size:2rem;height:64px;justify-content:center;margin:0 auto 16px;width:64px}.tool-card-title{color:var(--secondary-color);font-size:1.25rem;font-weight:600;margin-bottom:8px}.tool-card-description{color:var(--text-muted);font-size:.9rem;line-height:1.5}.tool-card.merge .tool-card-icon{background-color:#fed7d7;color:#c53030}.tool-card.split .tool-card-icon{background-color:#feebc8;color:#c05621}.tool-card.compress .tool-card-icon{background-color:#c6f6d5;color:#276749}.tool-card.convert .tool-card-icon{background-color:#bee3f8;color:#2b6cb0}.tool-card.rotate .tool-card-icon{background-color:#e9d8fd;color:#6b46c1}.tool-card.watermark .tool-card-icon{background-color:#fef3c7;color:#92400e}.tool-card.protect .tool-card-icon{background-color:#d1fae5;color:#065f46}.tool-card.unlock .tool-card-icon{background-color:#fce7f3;color:#be185d}.tool-card.edit .tool-card-icon{background-color:#dbeafe;color:#1e40af}.tool-card.redact .tool-card-icon{background-color:#e5e7eb;color:#374151}.tool-card.crop .tool-card-icon{background-color:#fef3c7;color:#d97706}.tool-card.sign .tool-card-icon{background-color:#ede9fe;color:#7c3aed}.upload-area{background-color:var(--upload-bg);border:3px dashed var(--border-color);border-radius:var(--radius-lg);cursor:pointer;padding:20px 40px;text-align:center;transition:var(--transition)}.upload-area.dragover,.upload-area:hover{background-color:var(--upload-hover-bg);border-color:var(--primary-color)}.upload-area-icon{color:var(--primary-color);font-size:4rem;margin-bottom:1rem}.upload-area-title{color:var(--secondary-color);font-size:1.5rem;font-weight:600;margin-bottom:.5rem}.upload-area-subtitle{color:var(--text-muted);margin-bottom:1.5rem}.upload-area input[type=file]{display:none}.file-list{margin-top:2rem}.file-item{align-items:center;background:var(--card-background);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);display:flex;gap:16px;margin-bottom:12px;padding:16px;transition:var(--transition)}.file-item:hover{box-shadow:var(--shadow-md)}.file-item-icon{align-items:center;background-color:#fed7d7;border-radius:var(--radius-sm);color:#c53030;display:flex;flex-shrink:0;font-size:1.5rem;height:48px;justify-content:center;width:48px}.file-item-info{flex:1;min-width:0}.file-item-name{color:var(--secondary-color);font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-item-size{color:var(--text-muted);font-size:.85rem}.file-item-actions{display:flex;gap:8px}.file-item-btn{align-items:center;border:none;border-radius:var(--radius-sm);cursor:pointer;display:flex;font-size:1rem;height:36px;justify-content:center;transition:var(--transition);width:36px}.file-item-btn.move{background-color:#e2e8f0;color:var(--secondary-color);cursor:grab}.file-item-btn.delete{background-color:#fed7d7;color:#c53030}.file-item-btn.delete:hover{background-color:#feb2b2}.progress-container{margin:2rem 0}.progress-bar{background-color:var(--border-color);border-radius:4px;height:8px;overflow:hidden}.progress-bar-fill{background-color:var(--primary-color);border-radius:4px;height:100%;transition:width .3s ease}.progress-text{color:var(--text-muted);font-size:.9rem;margin-top:.5rem;text-align:center}.pdf-preview-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));margin-top:1.5rem}.pdf-preview-item{background:var(--card-background);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:12px;position:relative;text-align:center;transition:var(--transition)}.pdf-preview-item:hover{box-shadow:var(--shadow-md)}.pdf-preview-thumbnail{align-items:center;aspect-ratio:3/4;background-color:#f1f5f9;border-radius:var(--radius-sm);display:flex;justify-content:center;margin-bottom:8px;overflow:hidden;width:100%}.pdf-preview-thumbnail canvas,.pdf-preview-thumbnail img{max-height:100%;max-width:100%;-o-object-fit:contain;object-fit:contain}.pdf-preview-page{color:var(--text-muted);font-size:.85rem}.tool-page{margin:0 auto;max-width:900px;padding:40px 20px}.tool-header{margin-bottom:2rem;text-align:center}.tool-header-icon{align-items:center;background-color:#fed7d7;border-radius:var(--radius-lg);color:#c53030;font-size:2.5rem;height:80px;margin:0 auto 1rem;width:80px}.tool-actions,.tool-header-icon{display:flex;justify-content:center}.tool-actions{flex-wrap:wrap;gap:16px;margin-top:2rem}.success-state{padding:40px;text-align:center}.success-icon{align-items:center;background-color:#c6f6d5;border-radius:50%;color:#276749;display:flex;font-size:2.5rem;height:80px;justify-content:center;margin:0 auto 1rem;width:80px}.success-title{color:var(--secondary-color);font-size:1.5rem;font-weight:600;margin-bottom:.5rem}.success-message{color:var(--text-muted);margin-bottom:1.5rem}@media(max-width:768px){.page-title{font-size:2rem}.tools-grid{gap:16px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.upload-area{padding:40px 20px}.upload-area-icon{font-size:3rem}.upload-area-title{font-size:1.25rem}.tool-actions{align-items:center;flex-direction:column}.btn-lg{max-width:300px;width:100%}}@media(max-width:480px){.tools-grid{grid-template-columns:1fr}.file-item{flex-wrap:wrap}.file-item-actions{justify-content:flex-end;width:100%}}