:root{--color-bg-base:#0a0a0f;--color-bg-surface:#ffffff0a;--color-bg-surface-hover:#ffffff12;--color-border:#ffffff14;--color-border-hover:#8b5cf680;--color-primary-start:#4f46e5;--color-primary-end:#7c3aed;--color-primary-glow:#7c3aed59;--color-text-primary:#f1f0ff;--color-text-secondary:#a09cbd;--color-text-muted:#665f80;--color-success:#10b981;--color-danger:#ef4444;--color-danger-hover:#ef444426;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--transition-fast:.15s ease;--transition-normal:.25s ease;--transition-slow:.4s ease;--font-family:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-family);background-color:var(--color-bg-base);color:var(--color-text-primary);min-height:100vh;line-height:1.6;overflow-x:hidden}body:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(circle,#4f46e52e 0%,#0000 70%);width:600px;height:600px;position:fixed;top:-20%;left:-10%}body:after{content:"";pointer-events:none;z-index:0;background:radial-gradient(circle,#7c3aed24 0%,#0000 70%);width:500px;height:500px;position:fixed;bottom:-20%;right:-10%}#root{z-index:1;position:relative}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:#ffffff26}.app{min-height:100vh;padding:var(--space-8) var(--space-4);flex-direction:column;justify-content:center;align-items:center;display:flex}.card{background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(20px);width:100%;max-width:560px;padding:var(--space-10) var(--space-8);animation:.6s cubic-bezier(.22,1,.36,1) both card-enter;box-shadow:inset 0 0 0 1px #ffffff08,0 32px 64px #00000073,0 0 80px #4f46e50f}@keyframes card-enter{0%{opacity:0;transform:translateY(24px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.header{align-items:center;gap:var(--space-4);margin-bottom:var(--space-10);flex-direction:column;display:flex}.logo-wrapper{border-radius:var(--radius-lg);width:72px;height:72px;box-shadow:0 0 0 1px #ffffff1a, 0 8px 24px var(--color-primary-glow);animation:3s ease-in-out infinite logo-pulse;overflow:hidden}@keyframes logo-pulse{0%,to{box-shadow:0 0 0 1px #ffffff1a, 0 8px 24px var(--color-primary-glow)}50%{box-shadow:0 0 0 1px #7c3aed4d,0 8px 32px #7c3aed80}}.logo-wrapper img{object-fit:cover;width:100%;height:100%;display:block}.app-title{letter-spacing:-.03em;background:linear-gradient(135deg,#a5b4fc 0%,#c084fc 50%,#818cf8 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:2rem;font-weight:800;line-height:1.1}.app-subtitle{color:var(--color-text-secondary);text-align:center;letter-spacing:.01em;font-size:.9rem;font-weight:400}.files-section{gap:var(--space-3);margin-bottom:var(--space-4);flex-direction:column;display:flex}.file-slot{align-items:center;gap:var(--space-3);animation:.3s cubic-bezier(.22,1,.36,1) both slot-enter;display:flex}@keyframes slot-enter{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.file-slot-label{align-items:center;gap:var(--space-3);background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-3) var(--space-4);cursor:pointer;transition:border-color var(--transition-normal), background var(--transition-normal), box-shadow var(--transition-normal);flex:1;min-height:56px;display:flex;overflow:hidden}.file-slot-label:hover{border-color:var(--color-border-hover);background:var(--color-bg-surface-hover);box-shadow:0 0 0 3px #7c3aed1a}.file-slot-label.has-file{background:#4f46e50f;border-color:#4f46e566}.file-slot-label.has-file:hover{border-color:#4f46e599;box-shadow:0 0 0 3px #4f46e51f}.file-slot-index{border-radius:var(--radius-sm);background:linear-gradient(135deg, var(--color-primary-start), var(--color-primary-end));color:#fff;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:.75rem;font-weight:700;display:flex}.file-slot-content{flex:1;overflow:hidden}.file-slot-name{color:var(--color-text-primary);white-space:nowrap;text-overflow:ellipsis;font-size:.875rem;font-weight:500;overflow:hidden}.file-slot-hint{color:var(--color-text-muted);margin-top:1px;font-size:.75rem}.file-slot-icon{opacity:.5;transition:opacity var(--transition-fast);flex-shrink:0;font-size:1.25rem}.file-slot-label:hover .file-slot-icon{opacity:.8}.file-slot-label.has-file .file-slot-icon{opacity:1}.file-remove-btn{border-radius:var(--radius-sm);width:36px;height:36px;color:var(--color-danger);cursor:pointer;transition:background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);background:0 0;border:1px solid #ef444433;flex-shrink:0;justify-content:center;align-items:center;font-size:1rem;display:flex}.file-remove-btn:hover{background:var(--color-danger-hover);border-color:var(--color-danger);transform:scale(1.05)}.file-remove-btn:disabled{opacity:.25;cursor:not-allowed;transform:none}.btn-add-file{justify-content:center;align-items:center;gap:var(--space-2);width:100%;padding:var(--space-3) var(--space-4);border:1px dashed var(--color-border);border-radius:var(--radius-md);color:var(--color-text-secondary);font-family:var(--font-family);cursor:pointer;transition:border-color var(--transition-normal), color var(--transition-normal), background var(--transition-normal);margin-bottom:var(--space-6);background:0 0;font-size:.875rem;font-weight:500;display:flex}.btn-add-file:hover{border-color:var(--color-border-hover);color:var(--color-text-primary);background:var(--color-bg-surface-hover)}.btn-add-file-icon{font-size:1.1rem;font-weight:700}.divider{background:var(--color-border);height:1px;margin:var(--space-6) 0}.btn-merge{width:100%;padding:var(--space-4) var(--space-6);background:linear-gradient(135deg, var(--color-primary-start) 0%, var(--color-primary-end) 100%);border-radius:var(--radius-md);color:#fff;font-family:var(--font-family);letter-spacing:.01em;cursor:pointer;justify-content:center;align-items:center;gap:var(--space-3);transition:transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);border:none;font-size:1rem;font-weight:700;display:flex;position:relative;overflow:hidden;box-shadow:0 4px 16px #4f46e566,inset 0 0 0 1px #ffffff1a}.btn-merge:before{content:"";pointer-events:none;background:linear-gradient(135deg,#ffffff26 0%,#0000 60%);position:absolute;inset:0}.btn-merge:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 24px #4f46e58c,inset 0 0 0 1px #ffffff1f}.btn-merge:active:not(:disabled){transform:translateY(0)}.btn-merge:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}@keyframes spin{to{transform:rotate(360deg)}}.spinner{border:2px solid #ffffff4d;border-top-color:#fff;border-radius:50%;flex-shrink:0;width:18px;height:18px;animation:.7s linear infinite spin}.toast{margin-top:var(--space-4);padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);align-items:center;gap:var(--space-2);font-size:.875rem;font-weight:500;animation:.3s both toast-enter;display:flex}@keyframes toast-enter{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.toast-success{color:#6ee7b7;background:#10b9811a;border:1px solid #10b98140}.toast-error{color:#fca5a5;background:#ef44441a;border:1px solid #ef444440}.footer{margin-top:var(--space-8);text-align:center;color:var(--color-text-muted);font-size:.78rem;line-height:1.8}.footer a{color:var(--color-text-secondary);transition:color var(--transition-fast);text-decoration:none}.footer a:hover{color:var(--color-text-primary)}.privacy-badge{align-items:center;gap:var(--space-1);color:var(--color-text-muted);margin-top:var(--space-4);padding:var(--space-1) var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-full);background:var(--color-bg-surface);align-self:center;font-size:.75rem;display:inline-flex}.privacy-indicator{background:var(--color-success);border-radius:50%;width:6px;height:6px;animation:2s ease-in-out infinite blink}@keyframes blink{0%,to{opacity:1}50%{opacity:.3}}@media (width<=600px){.card{padding:var(--space-8) var(--space-5);border-radius:var(--radius-lg)}.app-title{font-size:1.6rem}.lang-switcher{top:var(--space-3);right:var(--space-3)}.lang-label{display:none}.lang-btn{padding:var(--space-1) var(--space-2);gap:var(--space-1)}}.lang-switcher{top:var(--space-4);right:var(--space-5);z-index:100;position:fixed}.lang-btn{align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);background:var(--color-bg-surface);border:1px solid var(--color-border);border-radius:var(--radius-full);color:var(--color-text-secondary);font-family:var(--font-family);cursor:pointer;-webkit-backdrop-filter:blur(12px);transition:border-color var(--transition-normal), color var(--transition-normal), background var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-fast);white-space:nowrap;letter-spacing:.03em;font-size:.8rem;font-weight:600;display:inline-flex;box-shadow:0 2px 12px #0000004d}.lang-btn:hover{border-color:var(--color-border-hover);color:var(--color-text-primary);background:var(--color-bg-surface-hover);transform:translateY(-1px);box-shadow:0 4px 16px #0006,0 0 0 3px #7c3aed1f}.lang-btn:active{transform:translateY(0)}.lang-flag{font-size:1rem;line-height:1}.lang-label{letter-spacing:.05em;text-transform:uppercase;font-size:.75rem;font-weight:700}.lang-arrow{opacity:.5;transition:opacity var(--transition-fast);font-size:.8rem}.lang-btn:hover .lang-arrow{opacity:1}