*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0f0f0f;--surface: #1a1a1a;--border: #2e2e2e;--accent: #5b8dee;--accent-dim: #2a3f6e;--text: #e8e8e8;--text-dim: #777;--green: #4caf7d;--red: #e05252}body{background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,sans-serif;min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:2rem 1rem}h1{font-size:1.6rem;font-weight:700;letter-spacing:.08em;color:var(--accent);margin-bottom:.25rem}.tagline{font-size:.8rem;color:var(--text-dim);margin-bottom:2rem;letter-spacing:.05em}.toggle{display:flex;background:var(--surface);border:1px solid var(--border);border-radius:8px;overflow:hidden;margin-bottom:2rem}.toggle button{flex:1;padding:.6rem 2rem;background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:.95rem;font-weight:500;transition:all .15s}.toggle button.active{background:var(--accent);color:#fff}.panel{width:100%;max-width:500px;display:none}.panel.active{display:block}#drop-zone{border:2px dashed var(--border);border-radius:12px;padding:3rem 2rem;text-align:center;cursor:pointer;transition:border-color .15s,background .15s}#drop-zone.dragover{border-color:var(--accent);background:var(--accent-dim)}#drop-zone .icon{font-size:2.5rem;margin-bottom:.75rem}#drop-zone p{color:var(--text-dim);font-size:.9rem}#drop-zone strong{color:var(--text)}#file-input{display:none}#send-ui{display:none;margin-top:1.5rem}.file-info{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:.75rem 1rem;margin-bottom:1.25rem;font-size:.85rem;color:var(--text-dim)}.file-info strong{color:var(--text)}#qr-canvas-wrap{display:flex;justify-content:center;margin-bottom:1.25rem}#qr-canvas{border-radius:8px;background:#fff;padding:12px}.chunk-label{text-align:center;font-size:.85rem;color:var(--text-dim);margin-bottom:1rem}.chunk-label span{color:var(--text);font-weight:600}.progress-bar-wrap{background:var(--border);border-radius:99px;height:6px;margin-bottom:.4rem;overflow:hidden;cursor:pointer}.progress-hint{display:block;text-align:right;font-size:.7rem;color:var(--text-dim, #888);opacity:.9;pointer-events:none;margin-bottom:.85rem}.progress-bar{height:100%;background:var(--accent);border-radius:99px;transition:width .2s}.controls{display:flex;gap:.75rem;align-items:center;margin-bottom:1rem}.controls label{font-size:.8rem;color:var(--text-dim);white-space:nowrap}input[type=range]{flex:1;accent-color:var(--accent)}.speed-val{font-size:.8rem;color:var(--text);width:3rem;text-align:right}.btn{display:block;width:100%;padding:.65rem;border-radius:8px;border:none;font-size:.9rem;font-weight:600;cursor:pointer;text-align:center;text-decoration:none;transition:opacity .15s}.btn:hover{opacity:.85}.btn-primary{background:var(--accent);color:#fff}.btn-ghost{background:var(--surface);color:var(--text);border:1px solid var(--border)}.seg{display:flex;background:var(--surface);border:1px solid var(--border);border-radius:6px;overflow:hidden;flex:1}.seg button{flex:1;padding:.35rem .4rem;background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:.78rem;font-weight:500;transition:all .15s;white-space:nowrap}.seg button.active{background:var(--accent);color:#fff}.seg-single{padding:.35rem .75rem;background:none;border:1px solid var(--border);border-radius:6px;color:var(--text-dim);cursor:pointer;font-size:.78rem;font-weight:500;transition:all .15s;min-width:2.5rem}.seg-single.active{background:var(--accent);border-color:var(--accent);color:#fff}.controls.disabled{opacity:.35;pointer-events:none}.dtmf-hint{font-size:.65rem;color:var(--text-dim);opacity:.7;margin-top:-.6rem;margin-bottom:1rem}#video-wrap{position:relative;border-radius:12px;overflow:hidden;background:#000;margin-bottom:1.25rem;aspect-ratio:4/3}#recv-video{width:100%;height:100%;object-fit:cover;display:block}#scan-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}.scan-box{width:55%;aspect-ratio:1;border:2px solid var(--accent);border-radius:6px;box-shadow:0 0 0 9999px #00000059;transition:border-color .1s}.scan-box.flash{border-color:var(--green);box-shadow:0 0 0 9999px #00000059,0 0 12px var(--green)}#recv-canvas{display:none}#recv-status{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:1rem;margin-bottom:1.25rem;text-align:center}#recv-status .status-line{font-size:.9rem;color:var(--text-dim);margin-bottom:.25rem}#recv-status .status-line strong{color:var(--text)}#recv-status .status-speed{font-size:.8rem;color:var(--text-dim);margin-bottom:.75rem}.recv-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.icon-btn{background:none;border:1px solid var(--border);border-radius:6px;color:var(--text-dim);cursor:pointer;font-size:1.1rem;line-height:1;padding:.3rem .5rem;transition:color .15s,border-color .15s}.icon-btn:hover{color:var(--text);border-color:var(--text-dim)}#chunks-grid{display:flex;flex-wrap:wrap;gap:3px;justify-content:center}.chunk-dot{width:var(--dot-size, 10px);height:var(--dot-size, 10px);border-radius:2px;background:var(--border)}.chunk-dot.got{background:var(--green)}.chunk-dot.last{background:#f5a623}#recv-done{display:none;background:var(--surface);border:1px solid var(--green);border-radius:8px;padding:1.5rem;text-align:center}#recv-done .done-icon{font-size:2rem;margin-bottom:.5rem}#recv-done p{font-size:.9rem;color:var(--text-dim);margin-bottom:1rem}#start-camera-btn{margin-bottom:.75rem}.error-msg{color:var(--red);font-size:.82rem;text-align:center;margin-top:.5rem}