:root{--bg-start:#e8ecf4;--bg-end:#f0f2f8;--card-bg:#ffffffe6;--card-border:#ffffff80;--primary:#5e5ce6;--primary-hover:#4b49c4;--primary-light:#5e5ce61f;--accent:#00b894;--text:#1a1a2e;--text-secondary:#6b7280;--text-muted:#9ca3af;--border:#e5e7eb;--shadow-sm:0 1px 3px #0000000f;--shadow-md:0 4px 16px #00000014;--shadow-lg:0 8px 32px #0000001a;--radius:16px;--radius-sm:10px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:linear-gradient(135deg, var(--bg-start), var(--bg-end));color:var(--text);-webkit-font-smoothing:antialiased;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Segoe UI,Roboto,sans-serif}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}header{-webkit-backdrop-filter:blur(20px)saturate(1.2);z-index:100;background:#ffffffbf;border-bottom:1px solid #ffffffb3;padding:14px 24px;position:sticky;top:0}header h1{background:linear-gradient(135deg, var(--primary), var(--accent));-webkit-text-fill-color:transparent;white-space:nowrap;-webkit-background-clip:text;background-clip:text;font-size:20px;font-weight:700}#nav{flex-wrap:wrap;gap:6px;display:flex}.nav-btn{border:1px solid var(--border);cursor:pointer;color:var(--text-secondary);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#fff9;border-radius:20px;padding:7px 14px;font-size:13px;font-weight:500;transition:all .25s cubic-bezier(.4,0,.2,1)}.nav-btn:hover{border-color:var(--primary);color:var(--primary);background:#ffffffe6;transform:translateY(-1px)}.nav-btn.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 2px 8px #5e5ce64d}.nav-btn.active:hover{background:var(--primary-hover);transform:translateY(-1px)}#content{max-width:860px;margin:28px auto;padding:0 16px;animation:.3s ease-out fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.card{background:var(--card-bg);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--card-border);border-radius:var(--radius);box-shadow:var(--shadow-md);margin-bottom:16px;padding:28px;transition:box-shadow .3s}.card:hover{box-shadow:var(--shadow-lg)}.card h2{background:linear-gradient(135deg, var(--text), var(--primary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-bottom:12px;font-size:20px;font-weight:700}.card p{color:var(--text-secondary);margin-bottom:16px;font-size:14px;line-height:1.7}.tool-section{display:none}.tool-section.active{display:block}label{color:var(--text-secondary);letter-spacing:.02em;text-transform:uppercase;margin-top:16px;margin-bottom:6px;font-size:13px;font-weight:600;display:block}label:first-child{margin-top:0}textarea,select,input[type=file],input[type=text]{border:1.5px solid var(--border);border-radius:var(--radius-sm);background:#fff;outline:none;width:100%;padding:11px 14px;font-family:inherit;font-size:14px;transition:all .2s}textarea:focus,select:focus,input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}textarea{resize:vertical;min-height:150px;font-family:SF Mono,Fira Code,monospace;line-height:1.6}select{appearance:none;cursor:pointer;background-color:#fff;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;padding-right:36px}.input-group{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.btn{border-radius:var(--radius-sm);cursor:pointer;letter-spacing:.01em;border:none;align-items:center;gap:8px;padding:11px 22px;font-size:14px;font-weight:600;transition:all .25s cubic-bezier(.4,0,.2,1);display:inline-flex;position:relative}.btn:after{content:"";border-radius:inherit;opacity:0;transition:opacity .3s;position:absolute;inset:0}.btn-primary{background:linear-gradient(135deg, var(--primary), #7c3aed);color:#fff;box-shadow:0 2px 10px #5e5ce64d}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 16px #5e5ce666}.btn-primary:active{transform:translateY(0)}.btn-secondary{color:var(--text);border:1px solid var(--border);background:#0000000d}.btn-secondary:hover{background:#00000014;transform:translateY(-1px)}.btn-success{color:#fff;background:linear-gradient(135deg,#00b894,#00cec9);box-shadow:0 2px 10px #00b8944d}.btn-success:hover{transform:translateY(-2px);box-shadow:0 4px 16px #00b89466}.card h2{margin-bottom:16px;padding-bottom:12px;position:relative}.card h2:after{content:"";background:linear-gradient(90deg, var(--primary), var(--accent));border-radius:2px;width:40px;height:3px;position:absolute;bottom:0;left:0}.result-box{border-radius:var(--radius-sm);word-break:break-all;border:1px solid var(--border);background:#f8f9fc;min-height:40px;margin-top:12px;padding:14px;font-size:13px;line-height:1.6;position:relative}.result-box:before{content:"";background:linear-gradient(180deg, var(--primary), var(--accent));border-radius:2px;width:3px;position:absolute;top:8px;bottom:8px;left:0}.tool-grid{grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px;display:grid}.tool-card{border-radius:var(--radius);background:var(--card-bg);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--card-border);box-shadow:var(--shadow-sm);cursor:pointer;text-align:center;padding:32px 16px 20px;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.tool-card:before{content:"";background:linear-gradient(90deg, var(--primary), var(--accent));opacity:0;height:3px;transition:opacity .3s;position:absolute;top:0;left:0;right:0}.tool-card:hover:before{opacity:1}.tool-card:hover{box-shadow:var(--shadow-lg);border-color:var(--primary);transform:translateY(-4px)}.tool-card .icon{background:linear-gradient(135deg, var(--primary-light), #00b89414);width:44px;height:44px;color:var(--primary);border-radius:12px;justify-content:center;align-items:center;margin:0 auto 12px;font-size:18px;font-weight:700;transition:all .3s;display:flex}.tool-card:first-child .icon{color:#5e5ce6;background:linear-gradient(135deg,#5e5ce626,#5e5ce60d)}.tool-card:nth-child(2) .icon{color:#00b894;background:linear-gradient(135deg,#00b89426,#00b8940d)}.tool-card:nth-child(3) .icon{color:#fdcb6e;background:linear-gradient(135deg,#fdcb6e33,#fdcb6e0d)}.tool-card:nth-child(4) .icon{color:#e17055;background:linear-gradient(135deg,#e1705526,#e170550d)}.tool-card:nth-child(5) .icon{color:#6c5ce7;background:linear-gradient(135deg,#6c5ce726,#6c5ce70d)}.tool-card:nth-child(6) .icon{color:#00cec9;background:linear-gradient(135deg,#00cec926,#00cec90d)}.tool-card:hover .icon{transform:scale(1.1)rotate(-5deg)}.tool-card .name{color:var(--text);font-size:15px;font-weight:600}.tool-card .desc{color:var(--text-muted);margin-top:4px;font-size:12px;display:inline-block;position:relative}.tool-card .desc:after{content:"";background:linear-gradient(90deg, var(--primary), var(--accent));border-radius:1px;width:0;height:1.5px;margin:4px auto 0;transition:width .3s;display:block}.tool-card:hover .desc:after{width:100%}.image-preview{max-width:100%;max-height:300px;box-shadow:var(--shadow-sm);border-radius:12px;margin-top:12px;display:none}.image-preview.show{display:block}input[type=file]{cursor:pointer;background:#f8f9fc;padding:10px}input[type=file]::file-selector-button{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:6px;margin-right:10px;padding:6px 14px;font-size:13px;font-weight:500;transition:all .2s}input[type=file]::file-selector-button:hover{background:var(--primary);color:#fff;border-color:var(--primary)}#qrcode-container{border-radius:var(--radius-sm);border:1px solid var(--border);background:#fff;justify-content:center;margin-top:16px;padding:16px;display:flex}#qrcode-container canvas,#qrcode-container img{max-width:280px}.file-list-item{border-radius:8px;align-items:center;gap:10px;padding:8px 10px;transition:background .2s;display:flex}.file-list-item:hover{background:#00000008}.file-type-badge{text-transform:uppercase;background:var(--primary-light);width:28px;height:28px;color:var(--primary);border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;font-size:10px;font-weight:700;display:inline-flex}.speed-row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 0;display:flex}.speed-row:last-child{border-bottom:none}.speed-label{align-items:center;gap:8px;font-size:15px;font-weight:500;display:flex}.speed-label:before{content:"";background:var(--text-muted);border-radius:50%;flex-shrink:0;width:8px;height:8px;transition:background .5s}.speed-row:first-child .speed-label:before{background:var(--primary)}.speed-row:nth-child(2) .speed-label:before{background:var(--accent)}.speed-row:nth-child(3) .speed-label:before{background:#fdcb6e}.speed-value{color:var(--primary);font-variant-numeric:tabular-nums;font-size:24px;font-weight:700;transition:color .5s}.speed-value.good{color:#00b894}.speed-value.ok{color:#fdcb6e}.speed-value.bad{color:#e17055}.speed-progress-bar{background:#e8e8ed;border-radius:4px;width:100%;height:6px;overflow:hidden}.speed-progress-fill{background:linear-gradient(90deg, var(--primary), var(--accent));border-radius:4px;width:0%;height:100%;transition:width .4s ease-out}#speed-start-btn:disabled{opacity:.6;cursor:not-allowed;transform:none!important}#speed-start-btn:not(:disabled){animation:2s infinite pulse}@keyframes pulse{0%,to{box-shadow:0 2px 10px #5e5ce64d}50%{box-shadow:0 2px 16px #5e5ce680}}@media (width<=640px){header{padding:12px 16px}.header-inner{flex-direction:column;align-items:flex-start}#nav{gap:5px}.nav-btn{padding:5px 11px;font-size:12px}.tool-grid{grid-template-columns:repeat(2,1fr);gap:10px}.tool-card{padding:18px 12px}.tool-card .icon{font-size:28px}header h1{font-size:18px}#content{margin:16px auto}.card{border-radius:14px;padding:20px}.speed-value{font-size:20px}}#footer{text-align:center;color:var(--text-muted);padding:24px 16px 32px;font-size:12px}#footer p{max-width:600px;margin:0 auto;line-height:1.6}.ad-banner{text-align:center;max-width:860px;min-height:1px;margin:12px auto;padding:0 16px}.ad-inline{margin-top:20px;margin-bottom:8px}@media (width<=400px){.tool-grid{grid-template-columns:repeat(2,1fr);gap:8px}.nav-btn{padding:4px 9px;font-size:11px}}