:root{--primary-color:#2563eb;--primary-hover:#1d4ed8;--bg-color:#f8fafc;--surface-color:#fff;--text-main:#0f172a;--text-muted:#64748b;--border-color:#e2e8f0;--border-hover:#cbd5e1;--success-color:#10b981;--error-color:#ef4444;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;--max-width:1200px}@media (prefers-color-scheme:dark){:root{--bg-color:#0f172a;--surface-color:#1e293b;--text-main:#f8fafc;--text-muted:#94a3b8;--border-color:#334155;--border-hover:#475569}}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-main);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6}a{color:var(--primary-color);text-decoration:none;transition:color .2s}a:hover{color:var(--primary-hover);text-decoration:underline}.container{max-width:var(--max-width);margin:0 auto;padding:0 1.5rem}.btn{border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:var(--primary-hover);text-decoration:none}.btn-primary:disabled{opacity:.7;cursor:not-allowed}.btn-secondary{background-color:var(--surface-color);color:var(--text-main);border:1px solid var(--border-color)}.btn-secondary:hover{background-color:var(--border-color);text-decoration:none}.card{background-color:var(--surface-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border-color);padding:1.5rem}.header{border-bottom:1px solid var(--border-color);background-color:var(--surface-color);z-index:100;position:sticky;top:0}.header-content{justify-content:space-between;align-items:center;height:4rem;display:flex}.logo{color:var(--text-main);align-items:center;gap:.5rem;font-size:1.25rem;font-weight:700;display:flex}.logo:hover{text-decoration:none}.nav{align-items:center;gap:1.5rem;display:flex}.nav-link{color:var(--text-muted);font-weight:500}.nav-link:hover{color:var(--text-main);text-decoration:none}@media (max-width:640px){.nav{display:none}}.hero{text-align:center;padding-top:4rem;padding-bottom:2rem}.hero h1{letter-spacing:-.02em;margin-bottom:1rem;font-size:2.5rem;font-weight:800}.hero p{color:var(--text-muted);max-width:600px;margin:0 auto;font-size:1.25rem}.converter-section{max-width:800px;margin:0 auto;padding:2rem 0}.dropzone{border:2px dashed var(--border-color);border-radius:var(--radius-xl);text-align:center;background-color:var(--surface-color);cursor:pointer;flex-direction:column;align-items:center;gap:1rem;padding:4rem 2rem;transition:all .2s;display:flex}.dropzone:hover,.dropzone.active{border-color:var(--primary-color);background-color:#2563eb0d}.dropzone-icon{width:48px;height:48px;color:var(--primary-color);opacity:.8}.dropzone h3{margin:0;font-size:1.5rem}.dropzone p{color:var(--text-muted)}.privacy-badge{background:var(--bg-color);color:var(--text-muted);border:1px solid var(--border-color);border-radius:99px;align-items:center;gap:.5rem;margin-top:1rem;padding:.5rem 1rem;font-size:.875rem;display:inline-flex}.settings-panel{background:var(--surface-color);border-radius:var(--radius-lg);border:1px solid var(--border-color);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:2rem;padding:1.5rem;display:grid}.form-group{flex-direction:column;gap:.5rem;display:flex}.form-group label{font-size:.875rem;font-weight:500}.form-control{border:1px solid var(--border-color);border-radius:var(--radius-sm);background:var(--bg-color);color:var(--text-main);padding:.5rem;font-size:1rem}.form-control:focus{outline:2px solid var(--primary-color);outline-offset:-1px}.checkbox-group{cursor:pointer;align-items:center;gap:.5rem;display:flex}.file-list{flex-direction:column;gap:1rem;margin-top:2rem;display:flex}.file-item{background:var(--surface-color);border:1px solid var(--border-color);border-radius:var(--radius-md);align-items:center;gap:1rem;padding:1rem;display:flex}@media (max-width:640px){.file-item{flex-direction:column;align-items:stretch}}.file-preview{border-radius:var(--radius-sm);border:1px solid var(--border-color);background-image:repeating-linear-gradient(45deg,#f1f5f9 25%,#0000 25% 75%,#f1f5f9 75%,#f1f5f9),repeating-linear-gradient(45deg,#f1f5f9 25%,#fff 25% 75%,#f1f5f9 75%,#f1f5f9);background-position:0 0,8px 8px;background-size:16px 16px;justify-content:center;align-items:center;width:60px;height:60px;display:flex;overflow:hidden}.file-preview img{object-fit:contain;max-width:100%;max-height:100%}.file-info{flex-grow:1;min-width:0}.file-name{white-space:nowrap;text-overflow:ellipsis;font-weight:600;overflow:hidden}.file-meta{color:var(--text-muted);gap:1rem;font-size:.875rem;display:flex}.file-actions{align-items:center;gap:.5rem;display:flex}.actions-bar{border-top:1px solid var(--border-color);justify-content:space-between;align-items:center;margin-top:1rem;padding-top:1rem;display:flex}.content-section{border-top:1px solid var(--border-color);padding-top:4rem;padding-bottom:4rem}.prose{max-width:800px;margin:0 auto}.prose h2{margin:2rem 0 1rem;font-size:2rem}.prose h3{margin:1.5rem 0 1rem;font-size:1.5rem}.prose p{color:var(--text-muted);margin-bottom:1.5rem}.prose ul,.prose ol{color:var(--text-muted);margin-bottom:1.5rem;padding-left:1.5rem}.prose li{margin-bottom:.5rem}.footer{border-top:1px solid var(--border-color);text-align:center;color:var(--text-muted);margin-top:4rem;padding:3rem 0}.footer-links{flex-wrap:wrap;justify-content:center;gap:1.5rem;margin-bottom:1.5rem;display:flex}.footer-links a{color:var(--text-muted)}.footer-links a:hover{color:var(--primary-color)}