:root{--bg: #06060f;--card: rgba(255,255,255,.035);--border: rgba(255,255,255,.08);--border-h: rgba(255,255,255,.15);--primary: #6366f1;--primary-2: #8b5cf6;--accent: #06b6d4;--text: #f1f5f9;--muted: #64748b;--success: #10b981;--error: #f43f5e;--warn: #f59e0b;--r: 18px;--r-sm: 10px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px 16px 48px;position:relative;overflow-x:hidden}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 70% 50% at 15% 20%,rgba(99,102,241,.13) 0%,transparent 70%),radial-gradient(ellipse 55% 40% at 85% 80%,rgba(6,182,212,.08) 0%,transparent 70%),radial-gradient(ellipse 40% 30% at 50% 110%,rgba(139,92,246,.07) 0%,transparent 60%);pointer-events:none;z-index:0}#app{width:100%;max-width:580px;position:relative;z-index:1}.lang-wrap{position:fixed;top:18px;right:18px;z-index:200}.lang-select{background:#ffffff0f;border:1px solid var(--border);color:var(--muted);padding:6px 10px;border-radius:8px;font-size:13px;cursor:pointer;outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none;transition:border-color .2s,color .2s}.lang-select:hover,.lang-select:focus{border-color:var(--primary);color:var(--text)}.header{text-align:center;margin-bottom:36px}.logo{display:inline-flex;align-items:center;gap:12px;margin-bottom:10px}.logo img{width:36px;height:36px;filter:drop-shadow(0 0 10px rgba(99,102,241,.6))}.logo h1{font-size:clamp(1.8rem,5vw,2.4rem);font-weight:800;letter-spacing:-.03em;background:linear-gradient(135deg,#fff 40%,var(--primary-2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.tagline{color:var(--muted);font-size:.9rem;font-style:italic}.zone-card{background:var(--card);border:1.5px solid var(--border);border-radius:var(--r);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);overflow:hidden;transition:border-color .25s,box-shadow .25s,background .25s}.zone-card:hover{border-color:var(--border-h);box-shadow:0 0 32px #6366f114}.zone-card.dragover{border-color:var(--primary);background:#6366f112;box-shadow:0 0 0 3px #6366f133,0 8px 40px #6366f126}.split-card{border-top:2px solid rgba(99,102,241,.45)}.join-card{border-top:2px solid rgba(6,182,212,.35)}.split-card.state-success{border-color:#10b98199;box-shadow:0 0 24px #10b9811a}.split-card.state-error,.join-card.state-error{border-color:#f43f5e80}.drop-area{padding:48px 32px 36px;text-align:center;cursor:pointer;user-select:none;-webkit-user-select:none}@media(max-width:480px){.drop-area{padding:36px 20px 28px}}.zone-icon{display:flex;align-items:center;justify-content:center;width:64px;height:64px;border-radius:16px;margin:0 auto 18px;animation:float 3.5s ease-in-out infinite;transition:transform .25s}.split-card .zone-icon{background:linear-gradient(135deg,#6366f133,#8b5cf633);color:#818cf8;box-shadow:0 4px 20px #6366f140}.join-card .zone-icon{background:linear-gradient(135deg,#06b6d433,#6366f133);color:#22d3ee;box-shadow:0 4px 20px #06b6d433}.zone-card.dragover .zone-icon,.zone-card:hover .zone-icon{animation:none;transform:scale(1.08)}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-7px)}}.drop-title{font-size:1.05rem;color:var(--text);font-weight:600;margin-bottom:6px}.drop-sub{font-size:.82rem;color:var(--muted);line-height:1.5}.drop-or-click{display:inline-block;margin-top:14px;font-size:.72rem;color:#ffffff2e;letter-spacing:.06em;text-transform:uppercase}.inline-num{background:transparent;border:none;border-bottom:2px solid var(--primary);color:var(--text);font-size:inherit;font-weight:700;font-family:SF Mono,Fira Code,monospace;text-align:center;width:2ch;min-width:1.6ch;padding:0 1px 1px;outline:none;-moz-appearance:textfield;transition:border-color .2s,width .1s;vertical-align:baseline}.inline-num::-webkit-inner-spin-button,.inline-num::-webkit-outer-spin-button{-webkit-appearance:none}.inline-num:focus{border-bottom-color:var(--accent)}.inner-sep{height:1px;background:var(--border)}.file-bar{display:flex;align-items:center;gap:12px;padding:13px 18px}.file-bar-icon{width:38px;height:38px;border-radius:9px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.split-card .file-bar-icon{background:#6366f133;color:#818cf8}.join-card .file-bar-icon{background:#06b6d433;color:#22d3ee}.file-bar-details{flex:1;min-width:0}.file-bar-name{font-size:.87rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-bar-meta{font-size:.74rem;color:var(--muted);margin-top:2px}.btn-clear{background:none;border:1px solid rgba(255,255,255,.1);color:var(--muted);padding:4px 10px;border-radius:6px;cursor:pointer;font-size:11px;flex-shrink:0;transition:border-color .2s,color .2s;line-height:1.4}.btn-clear:hover{border-color:var(--error);color:var(--error)}.action-row{display:flex;gap:10px;align-items:center;padding:14px 18px}.btn-primary{flex:1;display:flex;align-items:center;justify-content:center;gap:7px;border:none;border-radius:var(--r-sm);padding:12px 20px;font-size:.92rem;font-weight:700;cursor:pointer;letter-spacing:.01em;position:relative;overflow:hidden;transition:opacity .2s,transform .15s,box-shadow .2s;color:#fff}.btn-primary:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:#fff0;transition:background .2s}.btn-primary:hover{transform:translateY(-1px)}.btn-primary:hover:after{background:#ffffff12}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.38;cursor:not-allowed;transform:none;box-shadow:none!important}.split-card .btn-primary{background:linear-gradient(135deg,#6366f1,#8b5cf6);box-shadow:0 2px 16px #6366f159}.split-card .btn-primary:not(:disabled):hover{box-shadow:0 4px 24px #6366f18c}.join-card .btn-primary{background:linear-gradient(135deg,#0891b2,#6366f1);box-shadow:0 2px 16px #06b6d440}.join-card .btn-primary:not(:disabled):hover{box-shadow:0 4px 24px #06b6d473}.warn-bar{display:flex;align-items:flex-start;gap:8px;padding:9px 18px;background:#f59e0b14;border-top:1px solid rgba(245,158,11,.2);font-size:.78rem;color:var(--warn);line-height:1.4}.progress-wrap{padding:4px 18px 16px}.progress-track{height:3px;background:#ffffff12;border-radius:999px;overflow:hidden;margin-bottom:8px}.progress-fill{height:100%;border-radius:999px;transition:width .3s ease}.split-card .progress-fill{background:linear-gradient(90deg,var(--primary),var(--primary-2))}.join-card .progress-fill{background:linear-gradient(90deg,var(--accent),var(--primary))}.progress-fill.indeterminate{width:45%!important;background:linear-gradient(90deg,transparent,var(--accent),var(--primary),transparent);animation:sweep 1.4s ease-in-out infinite}@keyframes sweep{0%{transform:translate(-120%)}to{transform:translate(300%)}}.progress-label{font-size:.75rem;color:var(--muted)}.status-bar{display:flex;align-items:center;gap:8px;padding:11px 18px;font-size:.84rem;border-top:1px solid transparent}.status-bar.success{color:var(--success);border-top-color:#10b98133}.status-bar.error{color:var(--error);border-top-color:#f43f5e33}.file-list{padding:6px 14px 10px;display:flex;flex-direction:column;gap:5px;max-height:200px;overflow-y:auto}.file-list-item{display:flex;align-items:center;gap:9px;padding:7px 10px;background:#ffffff08;border-radius:8px;font-size:.8rem}.file-list-badge{font-size:.68rem;font-weight:700;color:var(--accent);background:#06b6d41f;border-radius:4px;padding:2px 5px;flex-shrink:0;min-width:28px;text-align:center}.file-list-badge.invalid{color:var(--error);background:#f43f5e1f}.file-list-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-list-size{color:var(--muted);flex-shrink:0}.ios-links{padding:10px 18px 14px}.ios-hint{font-size:.74rem;color:var(--muted);margin-bottom:8px}.ios-link-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;margin-bottom:6px;background:#6366f11a;border:1px solid rgba(99,102,241,.2);border-radius:9px;text-decoration:none;color:#a5b4fc;font-size:.84rem;font-weight:500;transition:background .2s}.ios-link-item:hover{background:#6366f12e}.ios-link-arrow{opacity:.6}.or-divider{display:flex;align-items:center;gap:14px;margin:24px 0;color:#ffffff2e;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}.or-divider:before,.or-divider:after{content:"";flex:1;height:1px;background:var(--border)}@keyframes fadeUp{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.fade-up{animation:fadeUp .22s ease both}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#ffffff1f;border-radius:999px}input[type=file]{display:none!important}