:root {
  color-scheme: dark;
  --ink: #f3f6ff;
  --muted: #a5afc3;
  --line: rgba(160, 180, 220, .18);
  --blue: #65a5ff;
  --blue-soft: rgba(101, 165, 255, .15);
  --green: #39e6a5;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { min-height: 100%; background: #080b14; }
body {
  margin: 0; min-height: 100vh; color: var(--ink);
  background:
    linear-gradient(180deg, rgba(5, 8, 18, .72), rgba(5, 8, 18, .88)),
    url("https://img2.pic.in.th/2511ef8cd2c2b8ad7497.jpg") center center / cover fixed no-repeat,
    #080b14;
}
.topbar {
  height: 72px; padding: 0 clamp(18px, 5vw, 72px); display: flex;
  align-items: center; justify-content: space-between;
  border-bottom: 1px solid rgba(190, 205, 240, .14);
  background: rgba(7, 10, 20, .48); backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-size: 21px; font-weight: 800; letter-spacing: -.8px; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; color: #07101f; background: var(--blue); font-size: 17px; font-weight: 800; box-shadow: 0 0 22px rgba(101,165,255,.3); }
.brand-light { color: var(--blue); }
.live-label { display: flex; align-items: center; gap: 8px; color: #c1cbe0; font-size: 10px; font-weight: 800; letter-spacing: 1.5px; }
.live-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 12px rgba(57,230,165,.75); }
.page { width: min(920px, calc(100% - 32px)); margin: 0 auto; }
.test-panel { padding: clamp(44px, 8vw, 78px) 0 40px; text-align: center; }
.eyebrow { margin: 0 0 12px; color: #8bbcff; font-size: 11px; font-weight: 800; letter-spacing: 2px; }
h1 { margin: 0; font-size: clamp(24px, 4vw, 35px); letter-spacing: -1px; line-height: 1.25; text-shadow: 0 2px 20px rgba(0,0,0,.3); }
.intro { margin: 12px 0 0; color: var(--muted); font-size: 14px; }
.speed-display { margin: 35px auto 25px; max-width: 560px; }
.speed-number-wrap { min-height: 132px; display: flex; align-items: baseline; justify-content: center; gap: 12px; white-space: nowrap; }
.speed-number { font-size: clamp(88px, 19vw, 164px); line-height: 1; font-weight: 300; letter-spacing: -8px; font-variant-numeric: tabular-nums; text-shadow: 0 0 35px rgba(101,165,255,.18); }
.speed-unit { color: #c0cbe0; font-size: clamp(19px, 4vw, 28px); font-weight: 500; }
.phase-label { display: none; }
.progress-track { height: 4px; max-width: 300px; margin: 16px auto 0; overflow: hidden; border-radius: 99px; background: rgba(220,230,255,.16); }
.progress-bar { width: 0%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, #4b8cff, #54e6d1); box-shadow: 0 0 12px rgba(84,230,209,.45); transition: width .2s ease; }
.start-button { min-width: 190px; min-height: 52px; padding: 0 30px; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; background: linear-gradient(135deg, #5b9bff, #4974f5); color: #fff; font: inherit; font-size: 15px; font-weight: 750; cursor: pointer; box-shadow: 0 8px 28px rgba(50,105,255,.28); transition: transform .15s ease, filter .15s ease; }
.start-button:hover { filter: brightness(1.1); transform: translateY(-1px); }
.start-button:focus-visible { outline: 3px solid #a9c8ff; outline-offset: 3px; }
.start-button:disabled { cursor: wait; opacity: .7; transform: none; }
.status-message { min-height: 22px; margin: 16px 0 0; color: #c0c9dc; font-size: 13px; }
.results { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 12px 0 30px; }
.result-card { min-width: 0; padding: 20px 17px 18px; border: 1px solid var(--line); border-radius: 15px; background: rgba(13, 18, 33, .68); box-shadow: 0 12px 36px rgba(0,0,0,.12); backdrop-filter: blur(14px); }
.result-heading { display: flex; align-items: center; gap: 8px; color: #c5cde0; font-size: 12px; font-weight: 700; }
.metric-icon { width: 27px; height: 27px; display: grid; place-items: center; border-radius: 8px; font-size: 19px; font-weight: 800; }
.download-icon { color: #79caff; background: rgba(39,170,255,.15); }
.upload-icon { color: #65e8b2; background: rgba(22,184,117,.15); }
.ping-icon { color: #c0a2ff; background: rgba(139,92,229,.18); }
.jitter-icon { color: #ffc778; background: rgba(206,123,22,.16); }
.metric-value { display: flex; align-items: baseline; gap: 5px; margin-top: 16px; white-space: nowrap; }
.metric-value span { overflow: hidden; font-size: clamp(25px, 3.5vw, 34px); font-weight: 750; letter-spacing: -1.3px; font-variant-numeric: tabular-nums; }
.metric-value small { color: #a3aec4; font-size: 11px; }
.result-card p { margin: 8px 0 0; color: #9aa6bc; font-size: 11px; line-height: 1.5; }
@media (max-width: 650px) {
  .topbar { height: 62px; }
  .brand { font-size: 19px; }
  .live-label { font-size: 9px; letter-spacing: 1px; }
  .test-panel { padding-top: 48px; }
  .speed-display { margin-top: 40px; }
  .speed-number-wrap { min-height: 105px; gap: 8px; }
  .speed-number { letter-spacing: -5px; }
  .results { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .result-card { padding: 16px 14px; }
  .metric-value { margin-top: 12px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }