:root{--bg:#0f1117;--surface:#1a1d27;--surface2:#2a2d3a;--accent1:#e74c3c;--accent2:#e67e22;--success:#27ae60;--warning:#e67e22;--text:#e8e8e8;--text-muted:#666;--text-dim:#444;--radius:10px;--radius-sm:6px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);flex-direction:column;align-items:center;min-height:100dvh;padding:24px 16px 48px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;display:flex}header{justify-content:space-between;align-items:center;width:100%;max-width:480px;margin-bottom:32px;display:flex}.logo{align-items:center;gap:10px;display:flex}.logo-icon{background:linear-gradient(135deg, var(--accent1), var(--accent2));border-radius:8px;width:32px;height:32px}.logo-text{letter-spacing:-.3px;font-size:1.1rem;font-weight:700}.lang-btn{background:var(--surface);border:1px solid var(--surface2);color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;padding:4px 10px;font-size:.75rem;transition:color .15s}.lang-btn:hover{color:var(--text)}main{width:100%;max-width:480px}.hero{text-align:center;margin-bottom:28px}.hero h1{margin-bottom:4px;font-size:1.4rem;font-weight:700}.hero p{color:var(--text-muted);font-size:.85rem}.tabs{background:var(--surface);border-radius:var(--radius);gap:4px;margin-bottom:16px;padding:4px;display:flex}.tab{text-align:center;border-radius:var(--radius-sm);cursor:pointer;color:var(--text-muted);-webkit-user-select:none;user-select:none;flex:1;padding:8px;font-size:.9rem;font-weight:600;transition:color .2s}.tab.active{background:linear-gradient(135deg, var(--accent1), var(--accent2));color:#fff}.dropzone{border:2px dashed var(--surface2);border-radius:var(--radius);text-align:center;cursor:pointer;margin-bottom:12px;padding:36px 24px;transition:border-color .2s,background .2s}.dropzone:hover,.dropzone.drag-over{border-color:var(--accent1);background:#e74c3c0d}.dropzone .icon{margin-bottom:8px;font-size:2rem}.dropzone .label{color:var(--text-muted);font-size:.9rem}.dropzone .sub{color:var(--text-dim);margin-top:4px;font-size:.8rem}.dropzone.compact{padding:10px 24px}.dropzone.compact .icon{display:none}.file-list{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.file-card{background:var(--surface);border:1px solid var(--surface2);border-radius:var(--radius-sm);align-items:center;gap:10px;padding:10px 12px;animation:.15s ease-out slideIn;display:flex}.file-card.dragging{opacity:.4}.file-card.drag-target{border-color:var(--accent1)}.drag-handle{color:var(--accent1);cursor:grab;flex-shrink:0;font-size:1.1rem}.drag-handle:active{cursor:grabbing}.file-info{flex:1;min-width:0}.file-name{white-space:nowrap;text-overflow:ellipsis;font-size:.85rem;overflow:hidden}.file-meta{color:var(--text-muted);margin-top:2px;font-size:.75rem}.delete-btn{color:var(--text-dim);cursor:pointer;background:0 0;border:none;flex-shrink:0;padding:0 4px;font-size:1rem;transition:color .15s}.delete-btn:hover{color:var(--accent1)}.merge-btn{border-radius:var(--radius);cursor:pointer;border:none;width:100%;padding:14px;font-size:1rem;font-weight:700;transition:opacity .2s,box-shadow .3s}.merge-btn:disabled{background:var(--surface);color:var(--text-dim);border:1px solid var(--surface2);cursor:not-allowed}.merge-btn.ready{background:linear-gradient(135deg, var(--accent1), var(--accent2));color:#fff;box-shadow:0 4px 20px #e74c3c40}.merge-btn.ready:hover{box-shadow:0 6px 28px #e74c3c73}.merge-btn.merging{background:var(--surface);color:var(--text-muted);cursor:not-allowed}.progress-bar{background:var(--surface2);border-radius:2px;height:2px;margin-top:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--accent1), var(--accent2));border-radius:2px;width:40%;height:100%;animation:1.2s ease-in-out infinite progress}.success-card{border-radius:var(--radius);text-align:center;background:#0d2818;border:1px solid #27ae604d;margin-bottom:12px;padding:24px;animation:.3s cubic-bezier(.34,1.56,.64,1) scaleIn}.success-icon{margin-bottom:10px;font-size:2.5rem}.success-title{color:var(--success);margin-bottom:4px;font-size:1.1rem;font-weight:700}.success-sub{color:var(--text-muted);margin-bottom:12px;font-size:.8rem}.success-file{background:var(--surface);border-radius:var(--radius-sm);color:var(--text-muted);padding:6px 12px;font-size:.8rem;display:inline-block}.stats{grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:12px;display:grid}.stat{background:var(--surface);border-radius:var(--radius-sm);text-align:center;padding:10px;animation:.3s ease-out both fadeIn}.stat:first-child{animation-delay:.1s}.stat:nth-child(2){animation-delay:.2s}.stat:nth-child(3){animation-delay:.3s}.stat-value{font-size:1.1rem;font-weight:700}.stat-label{color:var(--text-muted);margin-top:2px;font-size:.7rem}.stat:first-child .stat-value{color:var(--accent1)}.stat:nth-child(2) .stat-value{color:var(--accent2)}.stat:nth-child(3) .stat-value{color:#f1c40f}.warning-card{border-radius:var(--radius);background:#1c1500;border:1px solid #e67e2259;align-items:flex-start;gap:12px;margin-bottom:12px;padding:14px 16px;animation:.4s ease-out .4s both fadeIn;display:flex}.warning-icon{flex-shrink:0;font-size:1.2rem}.warning-title{color:var(--warning);margin-bottom:4px;font-size:.85rem;font-weight:600}.warning-body{color:var(--text-muted);font-size:.78rem;line-height:1.5}.reset-btn{background:var(--surface);border:1px solid var(--surface2);border-radius:var(--radius);width:100%;color:var(--text-muted);cursor:pointer;padding:12px;font-size:.9rem;transition:color .15s,border-color .15s}.reset-btn:hover{color:var(--text);border-color:var(--text-muted)}.error-card{border-radius:var(--radius);text-align:center;background:#1c0808;border:1px solid #e74c3c4d;margin-bottom:12px;padding:20px}.error-title{color:var(--accent1);margin-bottom:8px;font-weight:600}.error-msg{color:var(--text-muted);font-size:.85rem}footer{text-align:center;margin-top:40px}.github-link{color:var(--text-dim);align-items:center;gap:6px;font-size:.78rem;text-decoration:none;transition:color .15s;display:inline-flex}.github-link:hover{color:var(--text-muted)}.github-icon{fill:currentColor;flex-shrink:0;width:16px;height:16px}@keyframes slideIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes scaleIn{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.faq{background:var(--bg);max-width:480px;margin:0 auto;padding:2rem 1rem 1.5rem}.faq-title{color:var(--text-muted);letter-spacing:2px;text-transform:uppercase;margin:0 0 1rem;font-size:.68rem;font-weight:500}.faq-list{flex-direction:column;gap:.75rem;display:flex}.faq-item{background:#ffffff08;border-left:2px solid;border-radius:0 4px 4px 0;padding:.75rem .875rem}.faq-item--red{border-color:#e74c3c}.faq-item--orange{border-color:#e67e22}.faq-heading{align-items:center;gap:6px;margin-bottom:.35rem;display:flex}.faq-icon{flex-shrink:0;width:16px;height:16px}.faq-item--red .faq-icon{color:#e74c3c}.faq-item--orange .faq-icon{color:#e67e22}.faq-q{color:var(--text);font-size:.8rem;font-weight:500}.faq-a{color:#999;margin:0;padding-left:22px;font-size:.8rem;line-height:1.6}.faq-link{color:#e74c3c;border-bottom:1px solid #e74c3c4d;text-decoration:none}.faq-link:hover{border-bottom-color:#e74c3cb3}@keyframes progress{0%{transform:translate(-100%)}to{transform:translate(350%)}}