:root{--bg: #f0f2f5;--bg-card: #ffffff;--bg-input: #eef1f6;--border: #e5e7eb;--border-hover: #d1d5db;--text: #1a1d23;--text-dim: #6b7280;--accent: #7B3FF2;--accent-light: #8A4FFF;--gradient-primary: linear-gradient(135deg, #8A4FFF, #5B2BE0);--glow-primary: 0 0 15px rgba(123, 63, 242, .4), 0 0 30px rgba(123, 63, 242, .2);--glow-active: 0 0 10px rgba(123, 63, 242, .3);--green: #10b981;--red: #ef4444;--radius: 16px;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--shadow: 0 8px 30px rgba(0, 0, 0, .08);--shadow-hover: 0 16px 48px rgba(0, 0, 0, .12)}[data-theme=dark]{--bg: #09090b;--bg-card: #18181b;--bg-input: #27272a;--border: #27272a;--border-hover: #3f3f46;--text: #e8eaf0;--text-dim: #9ca3b4;--shadow: 0 8px 30px rgba(0, 0, 0, .3);--shadow-hover: 0 16px 48px rgba(0, 0, 0, .5)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1.5rem;transition:background .3s,color .3s}#app{width:100%;max-width:520px}.top-nav{display:flex;justify-content:flex-end;margin-bottom:1rem}.theme-toggle,.nav-btn{background:none;border:none;padding:8px;cursor:pointer;color:var(--text-dim);font-size:1.2rem;border-radius:50%;transition:color .2s,background .2s;display:flex;align-items:center;justify-content:center}.theme-toggle:hover,.nav-btn:hover{background:var(--bg-card);color:var(--text)}.logo{text-align:center;margin-bottom:2rem}.logo h1{font-size:1.75rem;font-weight:700;letter-spacing:-.04em}.logo h1 span{color:var(--accent)}.logo p{font-size:.8rem;color:var(--text-dim);margin-top:4px}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow);transition:background .3s,border-color .3s,box-shadow .3s,transform .3s}.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}.format-row{display:flex;gap:.75rem;align-items:end;margin-bottom:1.25rem}.format-group{flex:1;display:flex;flex-direction:column;gap:6px}.format-group label{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);font-weight:600}select{width:100%;appearance:none;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:10px 14px;color:var(--text);font-family:var(--font);font-size:.85rem;cursor:pointer;outline:none;transition:border-color .2s,background .3s,color .3s}select:hover{border-color:var(--border-hover)}select:focus{border-color:var(--accent)}select option{background:var(--bg-card);color:var(--text)}.swap-btn{width:36px;height:36px;border-radius:50%;background:var(--bg-input);border:1px solid var(--border);color:var(--text);font-size:1rem;cursor:pointer;flex-shrink:0;transition:transform .3s,background .2s;display:flex;align-items:center;justify-content:center}.swap-btn:hover{transform:rotate(180deg);border-color:var(--accent)}.dropzone{border:2px dashed var(--border);border-radius:8px;padding:2.5rem 1rem;text-align:center;cursor:pointer;transition:border-color .2s,background .2s;margin-bottom:1.25rem;background:var(--bg-card)}.dropzone:hover,.dropzone.drag-over{border-color:var(--accent);background:#7b3ff20f;box-shadow:inset 0 0 0 1px #7b3ff21a}.dropzone-icon{font-size:2rem;margin-bottom:.5rem;opacity:.8;color:var(--accent)}.dropzone-text{font-size:.9rem;color:var(--text-dim)}.dropzone-text strong{color:var(--accent);cursor:pointer}.dropzone-hint{font-size:.75rem;color:var(--text-dim);margin-top:6px;opacity:.8}.file-input{display:none}.file-info{display:none;align-items:center;gap:.75rem;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:10px 14px;margin-bottom:1.25rem}.file-info.active{display:flex}.file-icon{font-size:1.2rem}.file-details{flex:1;min-width:0}.file-name{font-size:.85rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-size{font-size:.7rem;color:var(--text-dim)}.file-remove{width:28px;height:28px;border-radius:50%;border:none;background:#ef44441a;color:var(--red);cursor:pointer;font-size:.8rem;display:flex;align-items:center;justify-content:center;transition:background .2s,transform .2s}.file-remove:hover{background:#ef444433;transform:scale(1.05)}.convert-btn{width:100%;padding:14px;border:none;border-radius:12px;background:var(--gradient-primary);background-size:200% auto;color:#fff;font-family:var(--font);font-size:1rem;font-weight:600;cursor:pointer;transition:opacity .2s,transform .1s,box-shadow .3s,background-position .5s;box-shadow:var(--glow-active)}.convert-btn:hover:not(:disabled){opacity:.95;box-shadow:var(--glow-primary);background-position:right center}.convert-btn:active:not(:disabled){transform:scale(.98)}.convert-btn:disabled{opacity:.5;cursor:not-allowed;background:var(--bg-input);color:var(--text-dim);box-shadow:none}.convert-btn.converting{animation:pulseButton 1.5s infinite;background-size:200% auto}@keyframes pulseButton{0%{transform:scale(1);box-shadow:0 0 #7b3ff266}50%{transform:scale(.98);box-shadow:0 0 0 10px #7b3ff200}to{transform:scale(1);box-shadow:0 0 #7b3ff200}}.progress-section{display:none;margin-top:1rem}.progress-section.active{display:block}.progress-track{width:100%;height:8px;background:var(--bg-input);border-radius:8px;overflow:hidden;margin-bottom:8px;box-shadow:inset 0 1px 2px #0000001a}.progress-fill{height:100%;width:0%;background-image:linear-gradient(45deg,rgba(255,255,255,.15) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.15) 50%,rgba(255,255,255,.15) 75%,transparent 75%,transparent);background-color:var(--accent);background-size:1rem 1rem;border-radius:8px;transition:width .2s ease-out;box-shadow:var(--glow-active);animation:progressStripes 1s linear infinite}@keyframes progressStripes{0%{background-position:1rem 0}to{background-position:0 0}}.progress-status{display:flex;justify-content:space-between;font-size:.8rem;color:var(--text-dim);font-weight:500}.error-section{display:none;margin-top:1rem;background:#ef44441a;border:1px solid rgba(239,68,68,.2);border-radius:8px;padding:10px 14px;color:var(--red);font-size:.85rem}.error-section.active{display:flex;align-items:center;gap:8px}.download-section{display:none;text-align:center;margin-top:1.25rem;animation:fadeIn .3s ease}.download-section.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.download-success{display:flex;align-items:center;justify-content:center;gap:6px;color:var(--green);font-weight:600;font-size:.9rem;margin-bottom:1rem}.download-btn{display:inline-flex;align-items:center;gap:6px;padding:12px 32px;border:none;border-radius:8px;background:var(--green);color:#fff;font-family:var(--font);font-size:.95rem;font-weight:600;cursor:pointer;transition:opacity .2s}.download-btn:hover{opacity:.9}.convert-another-btn{display:inline-block;margin-top:12px;background:none;border:none;color:var(--text-dim);font-size:.8rem;cursor:pointer;text-decoration:underline;text-underline-offset:3px;font-family:var(--font)}.convert-another-btn:hover{color:var(--text)}.privacy{text-align:center;margin-top:1.5rem;font-size:.75rem;color:var(--text-dim);display:flex;align-items:center;justify-content:center;gap:4px}@media(max-width:480px){body{padding:1rem;align-items:flex-start}.card{padding:1.25rem}.logo h1{font-size:1.5rem}.logo p{font-size:.75rem}.format-row{flex-direction:column;align-items:stretch}.swap-btn{align-self:center;transform:rotate(90deg);margin:8px 0}.swap-btn:hover{transform:rotate(270deg)}.file-info{padding:8px 10px;gap:.5rem}.file-icon{font-size:1rem}.file-name{font-size:.8rem}.modal-overlay{padding:1rem}.modal-content{border-radius:12px}.modal-header,.modal-body{padding:1rem}#editor-textarea{min-height:200px;padding:12px}.modal-footer{padding:1rem}.modal-footer>div:last-child{flex-direction:column}.modal-btn{width:100%;justify-content:center}}.toast{position:fixed;bottom:1.5rem;right:1.5rem;background:var(--bg-card);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:12px 20px;font-size:.9rem;font-weight:500;z-index:1000;box-shadow:var(--shadow);animation:slideIn .3s ease}@keyframes slideIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.toast.fade-out{animation:slideOut .3s ease forwards}@keyframes slideOut{to{opacity:0;transform:translateY(20px)}}.modal-overlay{position:fixed;inset:0;background:#0006;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:2000;opacity:0;pointer-events:none;transition:opacity .3s ease;padding:1.5rem}.modal-overlay.active{opacity:1;pointer-events:auto}.modal-content{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);width:100%;max-width:600px;box-shadow:var(--shadow-hover);display:flex;flex-direction:column;transform:translateY(20px) scale(.98);transition:transform .3s cubic-bezier(.16,1,.3,1);overflow:hidden}.modal-overlay.active .modal-content{transform:translateY(0) scale(1)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid var(--border)}.modal-header h2{font-size:1.1rem;font-weight:600;margin:0}.modal-close{background:none;border:none;color:var(--text-dim);cursor:pointer;padding:6px;border-radius:50%;display:flex;transition:background .2s,color .2s}.modal-close:hover{background:#ef44441a;color:var(--red)}.modal-body{padding:1.5rem;display:flex;flex-direction:column}#editor-textarea{width:100%;min-height:300px;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:16px;color:var(--text);font-family:var(--font);font-size:.95rem;line-height:1.6;resize:vertical;outline:none;transition:border-color .2s}#editor-textarea:focus{border-color:var(--accent)}.modal-footer{padding:1.25rem 1.5rem;border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:12px;background:var(--bg)}.modal-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:8px;font-family:var(--font);font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s}.modal-btn.outline{background:transparent;border:1px solid var(--border);color:var(--text)}.modal-btn.outline:hover:not(:disabled){border-color:var(--border-hover);background:var(--bg-input)}.modal-btn.primary{background:var(--gradient-primary);border:none;color:#fff;box-shadow:var(--glow-active)}.modal-btn.primary:hover:not(:disabled){box-shadow:var(--glow-primary);opacity:.95}.modal-btn:disabled{opacity:.5;cursor:not-allowed}