:root{--bg-main:#f9fafb;--bg-card:#fff;--border-color:#e5e7eb;--border-hover:#93c5fd;--color-primary:#2563eb;--color-secondary:#0d9488;--color-download:#2563eb;--color-upload:#0d9488;--color-latency:#7c3aed;--color-jitter:#db2777;--text-main:#111827;--text-muted:#4b5563;--text-dark:#9ca3af;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace}@media (prefers-color-scheme:dark){:root{--bg-main:#0f172a;--bg-card:#1e293b;--border-color:#334155;--border-hover:#475569;--color-primary:#3b82f6;--color-secondary:#14b8a6;--color-download:#3b82f6;--color-upload:#14b8a6;--color-latency:#a78bfa;--color-jitter:#f472b6;--text-main:#f8fafc;--text-muted:#cbd5e1;--text-dark:#64748b}}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-main);color:var(--text-main);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;overflow-x:hidden}#root{flex-direction:column;min-height:100vh;display:flex}.glass-panel{background:var(--bg-card);border:1px solid var(--border-color);border-radius:12px;transition:border-color .2s,opacity .3s;box-shadow:0 1px 3px #0000000d}.glass-panel:hover{border-color:var(--border-hover)}h1{color:var(--text-main);letter-spacing:-.02em;font-size:2rem;font-weight:700}h3{color:var(--text-main);font-size:1.1rem;font-weight:600}p{color:var(--text-muted);font-size:.95rem;line-height:1.5}.container{flex-direction:column;flex:1;gap:1.5rem;width:100%;max-width:960px;margin:0 auto;padding:2rem 1.5rem;display:flex}.app-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding-bottom:1rem;display:flex}.logo-container{align-items:center;gap:.5rem;display:flex}.logo-icon{color:var(--color-primary)}.logo-text{color:var(--text-main);font-size:1.25rem;font-weight:700}.btn-primary{background-color:var(--color-primary);color:#fff;cursor:pointer;border:none;border-radius:6px;align-items:center;gap:.5rem;padding:.75rem 2rem;font-size:1rem;font-weight:600;transition:background-color .15s;display:inline-flex}.btn-primary:hover{background-color:#1d4ed8}@media (prefers-color-scheme:dark){.btn-primary:hover{background-color:#2563eb}}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.meters-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1.25rem;width:100%;display:grid}@media (width<=480px){.meters-grid{grid-template-columns:1fr 1fr;gap:.75rem}}.meter-container{justify-content:center;align-items:center;width:150px;height:150px;margin:0 auto;display:flex;position:relative}.meter-svg{width:100%;height:100%;transform:rotate(-90deg)}.meter-bg{fill:none;stroke:var(--border-color);stroke-width:5px}.meter-progress{fill:none;stroke-width:6px;stroke-linecap:square;transition:stroke-dashoffset .15s linear}.meter-content{flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute}.meter-value{font-family:var(--font-sans);color:var(--text-main);letter-spacing:-.02em;font-size:2rem;font-weight:700;line-height:1}.meter-unit{color:var(--text-muted);letter-spacing:.02em;text-transform:uppercase;margin-top:.15rem;font-size:.75rem;font-weight:600}.meter-label{color:var(--text-dark);text-transform:uppercase;letter-spacing:.05em;text-align:center;margin-top:.5rem;font-size:.8rem;font-weight:500}.warning-box{color:#b91c1c;background:#ef44440a;border:1px solid #ef444426;border-radius:6px;align-items:flex-start;gap:.5rem;padding:.75rem 1rem;font-size:.85rem;display:flex}@media (prefers-color-scheme:dark){.warning-box{color:#fca5a5}}.warning-icon{color:#ef4444;flex-shrink:0}.app-footer{text-align:center;color:var(--text-dark);border-top:1px solid var(--border-color);margin-top:auto;padding:1.5rem;font-size:.8rem}.pulse-active{animation:2s linear infinite rotate-sync}@keyframes rotate-sync{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.select-control{background-color:var(--bg-card);color:var(--text-main);border:1px solid var(--border-color);cursor:pointer;font-size:.9rem;font-weight:500;font-family:var(--font-sans);border-radius:6px;outline:none;padding:.5rem 1rem;transition:border-color .15s}.select-control:focus,.select-control:hover{border-color:var(--color-primary)}