:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-soft: #0d1b2f;
  --card: rgba(17, 31, 52, 0.82);
  --card-strong: rgba(22, 40, 67, 0.94);
  --text: #edf6ff;
  --muted: #91a4bb;
  --line: rgba(148, 163, 184, 0.18);
  --accent: #50d6ff;
  --good: #5ee6a8;
  --warn: #ffd166;
  --bad: #ff6b8a;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius: 24px;
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
  margin: 0;
  min-height: 100%;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(80, 214, 255, 0.20), transparent 32rem),
    radial-gradient(circle at 90% 10%, rgba(94, 230, 168, 0.14), transparent 28rem),
    linear-gradient(145deg, #050b14 0%, var(--bg) 48%, #0a1323 100%);
  color: var(--text);
}

button, input { font: inherit; }

.shell {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) 16px 24px;
}

.card {
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.hero {
  display: grid;
  gap: 24px;
  align-items: center;
  padding: 28px;
  border-radius: calc(var(--radius) + 8px);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1, h2, p { margin-top: 0; }

h1 {
  margin-bottom: 10px;
  font-size: clamp(2.1rem, 10vw, 4.7rem);
  line-height: 0.95;
  letter-spacing: -0.07em;
}

h2 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.subtitle {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.55;
}

.primary-button {
  min-height: 58px;
  width: 100%;
  border: 0;
  border-radius: 999px;
  padding: 0 28px;
  color: #03111c;
  background: linear-gradient(135deg, var(--accent), var(--good));
  font-weight: 900;
  letter-spacing: -0.02em;
  cursor: pointer;
  box-shadow: 0 16px 40px rgba(80, 214, 255, 0.28);
  transition: transform 160ms ease, filter 160ms ease, opacity 160ms ease;
}

.primary-button:hover { transform: translateY(-1px); filter: brightness(1.05); }
.primary-button:active { transform: translateY(1px) scale(0.99); }
.primary-button:disabled { cursor: wait; opacity: 0.68; transform: none; }
.primary-button.stop { color: #fff; background: linear-gradient(135deg, #ff477e, #ff9f6e); }

.status {
  margin-top: 16px;
  padding: 16px;
  border-radius: 20px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.progress-track {
  height: 10px;
  margin-top: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.14);
}

.progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--good));
  transition: width 260ms ease;
}

.location {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
  padding: 16px 18px;
  border-radius: 20px;
}

.loc-badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.loc-badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: currentColor;
}

.loc-lan { color: var(--good); background: color-mix(in srgb, var(--good), transparent 82%); }
.loc-cloud { color: var(--accent); background: color-mix(in srgb, var(--accent), transparent 82%); }
.loc-unknown { color: var(--muted); background: color-mix(in srgb, var(--muted), transparent 82%); }

.loc-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.3;
}

.loc-prefix {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.loc-text strong {
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
}

.loc-sub {
  color: var(--muted);
  font-size: 0.9rem;
}

.loc-sub:empty { display: none; }

.metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 16px;
}

.metric-card {
  position: relative;
  overflow: hidden;
  min-height: 172px;
  padding: 20px;
  border-radius: var(--radius);
}

.metric-card::before {
  content: "";
  position: absolute;
  inset: -80px -80px auto auto;
  width: 170px;
  height: 170px;
  border-radius: 999px;
  background: radial-gradient(circle, color-mix(in srgb, var(--metric), transparent 65%), transparent 66%);
  pointer-events: none;
}

.metric-head, .metric-body {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.metric-head {
  color: var(--muted);
  font-weight: 750;
}

.unit {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.metric-body { margin-top: 22px; }

.metric-body strong {
  font-size: clamp(2rem, 12vw, 3.5rem);
  line-height: 0.9;
  letter-spacing: -0.07em;
  transition: color 180ms ease;
}

.metric-body span { color: var(--muted); }

.subtext {
  position: relative;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.ring {
  flex: 0 0 68px;
  width: 68px;
  height: 68px;
  transform: rotate(-90deg);
}

.ring circle {
  fill: none;
  stroke-width: 5;
}

.ring circle:first-child { stroke: rgba(148, 163, 184, 0.16); }
.ring circle:last-child {
  stroke: var(--metric);
  stroke-linecap: round;
  stroke-dasharray: 113;
  stroke-dashoffset: 113;
  transition: stroke-dashoffset 320ms ease;
}

.accent-latency { --metric: var(--accent); }
.accent-jitter { --metric: var(--warn); }
.accent-loss { --metric: var(--bad); }
.accent-download { --metric: #7c8cff; }
.accent-upload { --metric: var(--good); }

.score {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 22px;
  margin-top: 16px;
  padding: 22px;
  border-radius: calc(var(--radius) + 4px);
  background: var(--card-strong);
}

.score-ring-wrap {
  position: relative;
  width: 132px;
  height: 132px;
  flex: 0 0 auto;
}

.score-ring {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.score-ring circle {
  fill: none;
  stroke-width: 9;
}

.score-ring circle:first-child { stroke: rgba(148, 163, 184, 0.16); }

.score-ring circle:last-child {
  stroke: var(--score-color, var(--accent));
  stroke-linecap: round;
  stroke-dasharray: 327;
  stroke-dashoffset: 327;
  transition: stroke-dashoffset 520ms ease, stroke 320ms ease;
  filter: drop-shadow(0 0 8px color-mix(in srgb, var(--score-color, var(--accent)), transparent 55%));
}

.score-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.score-center strong {
  font-size: 2.7rem;
  letter-spacing: -0.06em;
  color: var(--score-color, var(--text));
  transition: color 320ms ease;
}

.score-out {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.82rem;
}

.score-detail { min-width: 0; }

.score-grade-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 2px 0 10px;
  flex-wrap: wrap;
}

.score-grade {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  padding: 4px 12px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--score-color, var(--accent)), transparent 80%);
  color: var(--score-color, var(--accent));
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.04em;
}

.score-label {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.summary {
  margin-top: 16px;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--card-strong);
}

.summary p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.55;
}

.footer {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 0 16px max(18px, env(safe-area-inset-bottom));
  color: var(--muted);
  font-size: 0.86rem;
}

@supports not (backdrop-filter: blur(1px)) {
  .card { background: rgba(17, 31, 52, 0.96); }
}

@media (min-width: 700px) {
  .shell { padding-top: 34px; }
  .hero { grid-template-columns: 1fr auto; padding: 42px; }
  .primary-button { width: auto; min-width: 190px; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .metric-card:first-child { grid-column: span 2; }
  .footer { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1020px) {
  .metrics { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .metric-card:first-child { grid-column: span 1; }
  .metric-body { align-items: flex-end; }
  .ring { width: 58px; height: 58px; flex-basis: 58px; }
  .metric-body strong { font-size: clamp(2.1rem, 4vw, 3.1rem); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}