:root{--bg:#f4f6f8;--surface:#fff;--surface-soft:#f8fafb;--border:#d8dee8;--text:#1d2733;--muted:#5f6c7b;--accent:#146c63;--accent-dark:#0d4f49;--danger:#b42318;--shadow:0 18px 42px rgba(29,39,51,.1);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0;background:radial-gradient(circle at 50% 0%,#fff 0,var(--bg) 44rem);color:var(--text)}button{font:inherit}button:focus-visible{outline:3px solid rgba(20,108,99,.28);outline-offset:3px}.speedtest-app{display:grid;min-height:100vh;place-items:center;padding:22px}.speedtest-card{width:min(840px,100%);padding:clamp(20px,4vw,34px);border:1px solid var(--border);border-radius:8px;background:var(--surface);box-shadow:var(--shadow)}.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.eyebrow{margin:0 0 6px;color:var(--accent);font-size:.78rem;font-weight:800;text-transform:uppercase}h1{margin:0;font-size:clamp(1.6rem,4vw,2.45rem);line-height:1.1}.ghost-button,.start-button{min-height:42px;border-radius:7px;cursor:pointer;font-weight:800}.ghost-button{padding:0 14px;border:1px solid var(--border);background:#fff;color:var(--text)}.ghost-button:disabled{cursor:not-allowed;opacity:.45}.ghost-button:not(:disabled):hover {border-color:var(--accent);color:var(--accent)}.gauge{position:relative;width:min(440px,100%);aspect-ratio: 2 / 1;margin:34px auto 0;overflow:hidden}.gauge-track,.gauge-fill{position:absolute;inset:0;border-radius:999px 999px 0 0}.gauge-track{background:conic-gradient(from 270deg at 50% 100%,#e7ecf2 0deg 180deg,transparent 180deg 360deg)}.gauge-fill{background:conic-gradient(from 270deg at 50% 100%,var(--accent) 0deg var(--gauge-angle,0deg),transparent var(--gauge-angle,0deg) 360deg);transition:background .2s ease}.gauge::after{content:"";position:absolute;left:9%;right:9%;bottom:-1px;height:82%;border-radius:999px 999px 0 0;background:var(--surface)}.needle{position:absolute;left:50%;bottom:0;z-index:2;width:4px;height:42%;border-radius:99px;background:var(--text);transform:translateX(-50%) rotate(var(--needle-angle,-90deg));transform-origin:50% 100%;transition:transform .25s ease}.gauge-center{position:absolute;inset:auto 12% 10px;z-index:3;display:grid;justify-items:center;gap:3px;text-align:center}.gauge-center span,.gauge-center small,.metric span,.metric small,.ip-grid dt{color:var(--muted);font-size:.78rem;font-weight:800;text-transform:uppercase}.gauge-center strong{font-size:clamp(2.4rem,9vw,4.6rem);line-height:1}.start-button{display:block;width:min(220px,100%);margin:24px auto 0;border:1px solid var(--accent);background:var(--accent);color:#fff;font-size:1rem}.start-button:hover{background:var(--accent-dark)}.start-button.is-running{border-color:var(--danger);background:var(--danger)}.status{min-height:25px;margin:12px 0 0;color:var(--muted);text-align:center;font-weight:700}.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:24px}.metric{min-width:0;padding:16px;border:1px solid var(--border);border-radius:8px;background:var(--surface-soft);text-align:center}.metric strong{display:block;min-height:40px;margin:8px 0 2px;font-size:clamp(1.55rem,4vw,2.15rem);line-height:1}.ip-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:18px 0 0}.ip-grid div{min-width:0;padding:14px 16px;border:1px solid var(--border);border-radius:8px;background:#fff}.ip-grid dt{margin-bottom:6px}.ip-grid dd{margin:0;overflow-wrap:anywhere;color:var(--text);font-weight:800}@media (max-width:720px){.speedtest-app{align-items:start;padding:14px}.topbar,.ip-grid{grid-template-columns:1fr}.topbar{display:grid}.ghost-button{width:100%}.metrics{grid-template-columns:1fr 1fr}}@media (max-width:440px){.metrics,.ip-grid{grid-template-columns:1fr}}