*{box-sizing:border-box;margin:0;padding:0}body,html{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#000000;min-height:100vh;color:#e0e0e0;position:relative}html:before{background-size:40px 40px;background-image:linear-gradient(90deg,#262626 1px,transparent 0),linear-gradient(180deg,#262626 1px,transparent 0);z-index:0}html:after,html:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%}html:after{background:black;-webkit-mask-image:radial-gradient(ellipse at center,transparent 20%,black);mask-image:radial-gradient(ellipse at center,transparent 20%,black);pointer-events:none;z-index:1}.container{max-width:800px;margin:0 auto;padding:2rem;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;z-index:2}.card{background:rgba(20,20,20,.95);border:1px solid rgba(255,255,255,.1);border-radius:12px;padding:3rem;box-shadow:0 20px 60px rgba(0,0,0,.5);width:100%;max-width:600px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.title{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;text-align:center;background:linear-gradient(135deg,#3b82f6,#1d4ed8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{font-size:1.1rem;color:#888;text-align:center;margin-bottom:2rem}.upload-area{border:3px dashed rgba(59,130,246,.5);border-radius:8px;padding:3rem;text-align:center;cursor:pointer;transition:all .3s ease;margin-bottom:1.5rem;background:rgba(255,255,255,.02)}.upload-area.drag-over,.upload-area:hover{border-color:#3b82f6;background-color:rgba(59,130,246,.1)}.upload-icon{font-size:3rem;margin-bottom:1rem;color:#3b82f6}.upload-text{font-size:1.1rem;color:#e0e0e0;margin-bottom:.5rem}.upload-hint{font-size:.9rem;color:#888}.file-input{display:none}.file-list{margin-top:1.5rem}.file-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem;border:1px solid rgba(255,255,255,.1);border-radius:6px;margin-bottom:.5rem;background:rgba(255,255,255,.03)}.file-info{display:flex;flex-direction:column;flex:1 1}.file-name{font-weight:500;margin-bottom:.25rem;color:#e0e0e0}.file-size{font-size:.85rem;color:#888}.remove-btn{background:#ff4444;color:white;border:none;border-radius:4px;padding:.5rem 1rem;cursor:pointer;font-size:.9rem;transition:background .2s}.remove-btn:hover{background:#cc0000}.btn{background:linear-gradient(135deg,#3b82f6,#1d4ed8);color:white;border:none;border-radius:8px;padding:1rem 2rem;font-size:1.1rem;font-weight:600;cursor:pointer;width:100%;margin-top:1rem;transition:transform .2s,box-shadow .2s}.btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 10px 20px rgba(59,130,246,.4)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:white;color:#3b82f6;border:2px solid #3b82f6;margin-top:.5rem}.btn-secondary:hover:not(:disabled){background:rgba(59,130,246,.1);box-shadow:0 10px 20px rgba(59,130,246,.2)}.progress-container{margin-top:1rem}.progress-bar-bg{background:rgba(255,255,255,.1);height:8px;border-radius:4px;overflow:hidden;margin-top:.5rem}.progress-bar-fill{background:linear-gradient(90deg,#3b82f6,#1d4ed8);height:100%;transition:width .3s ease}.progress-text{font-size:.9rem;color:#888;margin-bottom:.25rem}.code-display{background:rgba(59,130,246,.1);border:3px solid #3b82f6;border-radius:12px;padding:2rem;text-align:center;margin:2rem 0}.code-label{font-size:1rem;color:#888;margin-bottom:.5rem}.code-value{font-size:4rem;font-weight:700;color:#3b82f6;margin:1rem 0}.code-input,.code-value{letter-spacing:.5rem;font-family:Courier New,monospace}.code-input{width:100%;padding:1.5rem;font-size:2rem;text-align:center;border:2px solid rgba(255,255,255,.2);border-radius:8px;margin-bottom:1rem;transition:border-color .2s;background:rgba(255,255,255,.05);color:#e0e0e0}.code-input:focus{outline:none;border-color:#3b82f6;background:rgba(255,255,255,.08)}.countdown{font-size:1.5rem;color:#3b82f6;font-weight:600;margin:1rem 0;font-family:Courier New,monospace}.warning-text{color:#ff6b6b;font-size:1.1rem;margin-top:1rem;font-weight:500}.success-icon{font-size:4rem;color:#4caf50;margin-bottom:1rem}.error-message{background:#ffebee;border:1px solid #ff6b6b;border-radius:6px;padding:1rem;color:#d32f2f;margin-top:1rem;text-align:center}.download-item{display:flex;justify-content:space-between;align-items:center;padding:1rem;border:1px solid rgba(255,255,255,.1);border-radius:6px;margin-bottom:.75rem;transition:background .2s;background:rgba(255,255,255,.03)}.download-item:hover{background:rgba(59,130,246,.1);border-color:rgba(59,130,246,.3)}.download-btn{background:#3b82f6;color:white;border:none;border-radius:6px;padding:.5rem 1.5rem;cursor:pointer;font-size:.9rem;font-weight:500;transition:background .2s}.download-btn:hover{background:#2563eb}.back-link{color:#3b82f6;text-decoration:none;display:inline-block;margin-bottom:1rem;font-size:1.1rem;transition:all .2s}.back-link:hover{color:#2563eb;transform:translateX(-3px)}@media (max-width:640px){.card{padding:2rem 1.5rem}.title{font-size:2rem}.code-value{font-size:2.5rem;letter-spacing:.3rem}.code-input{font-size:1.5rem;letter-spacing:.3rem}}