:root{--bg: #0a0a0f;--bg-card: #111118;--bg-input: #1a1a25;--border: #2a2a3a;--text: #e0e0e8;--text-dim: #888898;--accent: #4ade80;--accent-dim: #22c55e;--error: #f87171;--mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--safe-bottom: env(safe-area-inset-bottom, 0px);--safe-top: env(safe-area-inset-top, 0px)}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{height:100%;background:var(--bg);color:var(--text);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-overflow-scrolling:touch;overscroll-behavior:none}#app{min-height:100dvh;display:flex;flex-direction:column;align-items:center;padding:2rem 1rem;padding-top:calc(2rem + var(--safe-top))}header{text-align:center;margin-bottom:2rem}header h1{font-size:2.5rem;font-weight:700;color:var(--accent);letter-spacing:-1px}.tagline{color:var(--text-dim);font-size:.95rem;margin-top:.25rem}main{width:100%;max-width:520px;flex:1}footer{margin-top:auto;padding-top:2rem;padding-bottom:var(--safe-bottom);text-align:center;color:var(--text-dim);font-size:.75rem}.view{display:none}.view.active{display:block}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;min-height:44px;border:1px solid var(--border);border-radius:8px;background:var(--bg-card);color:var(--text);font-size:1rem;cursor:pointer;transition:all .15s ease;-webkit-user-select:none;user-select:none}.btn:hover{border-color:var(--accent);background:#1a1a28}.btn:active{transform:scale(.97)}.btn.primary{background:var(--accent);color:#000;border-color:var(--accent);font-weight:600}.btn.primary:hover{background:var(--accent-dim)}.btn.large{flex-direction:column;padding:2rem;font-size:1.1rem;width:100%}.btn.large .icon{font-size:2rem;margin-bottom:.25rem}.btn.mode{flex-direction:column;padding:1rem;flex:1;text-align:center;min-height:72px}.btn.mode span{font-size:.8rem;color:var(--text-dim)}.btn.small{padding:.25rem .75rem;font-size:.8rem;min-height:32px}.landing-buttons{display:flex;gap:1rem}.security-note{margin-top:2rem;padding:1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;font-size:.85rem;color:var(--text-dim);text-align:center}.security-note .lock{margin-right:.5rem}input[type=email],input[type=text],.mono-input{width:100%;padding:.85rem 1rem;min-height:44px;margin-bottom:.75rem;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:16px;outline:none;transition:border-color .15s ease}input:focus{border-color:var(--accent)}.mono-input{font-family:var(--mono);letter-spacing:1px}form .btn{width:100%;margin-top:.5rem}h2{font-size:1.5rem;margin-bottom:1.5rem;text-align:center}h3{font-size:1rem;margin-bottom:.75rem;color:var(--text-dim)}.drop-zone{border:2px dashed var(--border);border-radius:12px;padding:3rem 1.5rem;text-align:center;cursor:pointer;transition:all .2s ease;position:relative}.drop-zone:hover,.drop-zone.dragover{border-color:var(--accent);background:#4ade800d}.drop-icon{font-size:2.5rem;display:block;margin-bottom:.5rem}.hint{font-size:.8rem;color:var(--text-dim);margin-top:.25rem}.file-input-hidden{position:absolute;width:0;height:0;opacity:0;overflow:hidden}.drop-text-mobile{display:none}.drop-text-desktop{display:block}.file-info{margin-top:1rem;padding:.75rem 1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;font-family:var(--mono);font-size:.9rem}.send-options{margin-top:1.5rem}.mode-buttons{display:flex;gap:.75rem}.session-info{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:1.25rem;margin-bottom:1.5rem}.info-row{display:flex;align-items:center;gap:.5rem;margin-bottom:.75rem;flex-wrap:wrap}.info-row label{font-size:.8rem;color:var(--text-dim);min-width:80px}.mono{font-family:var(--mono);font-size:1.1rem;color:var(--accent);letter-spacing:1px;user-select:all;word-break:break-all}.btn-copy{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;min-height:32px;border:1px solid var(--border);border-radius:6px;background:var(--bg-input);color:var(--text-dim);cursor:pointer;transition:all .15s ease;flex-shrink:0;padding:0}.btn-copy:hover{color:var(--accent);border-color:var(--accent)}.btn-copy:active{transform:scale(.9)}.btn-copy.copied{color:var(--accent);border-color:var(--accent);background:#4ade8026}.qr-code{display:block;margin:1rem auto;border-radius:8px;max-width:100%}.chunk-grid{display:flex;flex-wrap:wrap;gap:3px;padding:1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;margin-bottom:.75rem;min-height:48px;align-content:flex-start}.chunk-grid:empty{display:none}.chunk-block{width:14px;height:14px;border-radius:3px;background:var(--bg-input);border:1px solid var(--border);transition:all .3s ease;position:relative}.chunk-block.encrypting{background:#fbbf24;border-color:#f59e0b;box-shadow:0 0 6px #fbbf2480;animation:chunk-pulse .6s ease-in-out}.chunk-block.uploading{background:#38bdf8;border-color:#0ea5e9;box-shadow:0 0 6px #38bdf880;animation:chunk-pulse .6s ease-in-out}.chunk-block.done{background:var(--accent);border-color:var(--accent-dim);box-shadow:0 0 4px #4ade804d}.chunk-block.downloading{background:#38bdf8;border-color:#0ea5e9;box-shadow:0 0 6px #38bdf880;animation:chunk-pulse .6s ease-in-out}.chunk-block.decrypting{background:#c084fc;border-color:#a855f7;box-shadow:0 0 6px #c084fc80;animation:chunk-pulse .6s ease-in-out}@keyframes chunk-pulse{0%{transform:scale(1)}50%{transform:scale(1.3)}to{transform:scale(1)}}.chunk-stats{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem;font-size:.8rem}.chunk-stats .mono{font-size:.85rem}.chunk-speed{font-family:var(--mono);font-size:.8rem;color:var(--text-dim)}.chunk-legend{display:flex;gap:1rem;justify-content:center;margin-bottom:.75rem;flex-wrap:wrap}.chunk-legend-item{display:flex;align-items:center;gap:4px;font-size:.7rem;color:var(--text-dim)}.chunk-legend-swatch{width:10px;height:10px;border-radius:2px}.progress-container{margin:1.5rem 0}.progress-bar{width:100%;height:8px;background:var(--bg-input);border-radius:4px;overflow:hidden}.progress-fill{height:100%;width:0%;background:var(--accent);border-radius:4px;transition:width .3s ease}.progress-text{margin-top:.5rem;font-size:.85rem;color:var(--text-dim);text-align:center;font-family:var(--mono)}.status{margin-top:1rem;padding:.75rem 1rem;border-radius:8px;font-size:.9rem;text-align:center}.status:empty{display:none}.status.error{background:#f871711a;color:var(--error);border:1px solid rgba(248,113,113,.3)}.complete-message{text-align:center;padding:3rem 1rem}.complete-icon{display:inline-flex;align-items:center;justify-content:center;width:64px;height:64px;border-radius:50%;background:#4ade8026;color:var(--accent);font-size:2rem;margin-bottom:1.5rem}.complete-message p{color:var(--text-dim);margin-bottom:2rem}.hidden{display:none!important}@media(max-width:640px){#app{padding:1rem .75rem;padding-top:calc(1rem + var(--safe-top));padding-bottom:calc(1rem + var(--safe-bottom))}header{margin-bottom:1rem}header h1{font-size:1.75rem}.tagline{display:none}.landing-buttons{flex-direction:column}.btn.large{padding:1.5rem}.mode-buttons{flex-direction:column}.drop-zone{padding:2rem 1rem}.drop-text-desktop{display:none}.drop-text-mobile{display:block}.info-row{flex-direction:column;align-items:flex-start;gap:.25rem}.info-row label{min-width:auto}.info-row .mono{font-size:.95rem}.info-row .btn-copy,.info-row .btn.small{align-self:flex-start}.chunk-block{width:16px;height:16px}.progress-bar{height:10px;border-radius:5px}.progress-fill{border-radius:5px}.complete-message{padding:2rem 1rem}footer{padding-bottom:var(--safe-bottom)}.qr-code{max-width:200px}h2{font-size:1.25rem;margin-bottom:1rem}body{-webkit-user-select:none;user-select:none}.mono,input,.file-info{-webkit-user-select:text;user-select:text}}@media(max-width:360px){#app{padding:.75rem .5rem;padding-top:calc(.75rem + var(--safe-top));padding-bottom:calc(1rem + var(--safe-bottom))}header h1{font-size:1.5rem}.btn.large{padding:1.25rem;font-size:1rem}.mono{font-size:.85rem}.chunk-block{width:12px;height:12px}}