:root {
  --bg: #070708;
  --bg-elev: #0e0e11;
  --ink: #f2f2f4;
  --mute: #8b8b96;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --down: #3dd68c;
  --up: #6ea8fe;
  --ping: #ff8f6b;
  --panel: rgba(255, 255, 255, 0.03);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  min-height: 100%;
  color: var(--ink);
  font-family: Syne, "Segoe UI", sans-serif;
  background: var(--bg);
}

body {
  background-image:
    radial-gradient(900px 520px at 85% -5%, rgba(61, 214, 140, 0.08), transparent 55%),
    radial-gradient(700px 480px at 0% 100%, rgba(110, 168, 254, 0.07), transparent 50%),
    linear-gradient(180deg, #0a0a0c 0%, #070708 45%, #050506 100%);
  background-attachment: fixed;
}

.shell {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) 0 2.5rem;
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem 1.5rem;
  flex-wrap: wrap;
  animation: rise 0.7s var(--ease) both;
}

.brand {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.055em;
  line-height: 1;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.seg,
.btn {
  height: 44px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
}

.seg {
  display: flex;
  overflow: hidden;
}

.seg-btn,
.btn {
  appearance: none;
  margin: 0;
  font: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  cursor: pointer;
  color: var(--ink);
  transition:
    background 0.25s var(--ease),
    color 0.25s var(--ease),
    border-color 0.25s var(--ease),
    opacity 0.25s ease;
}

.seg-btn {
  height: 100%;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--mute);
  padding: 0 0.85rem;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
  font-size: 0.86rem;
}

.seg-btn:last-child { border-right: 0; }

.seg-btn:hover:not(:disabled):not(.is-on) {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.04);
}

.seg-btn.is-on {
  background: #f2f2f4;
  color: #070708;
}

.btn {
  padding: 0 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 7.5rem;
}

.btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.07);
}

.btn-primary {
  background: #f2f2f4;
  color: #070708;
  border-color: #f2f2f4;
}

.btn-primary:hover:not(:disabled) {
  background: #fff;
}

.seg-btn:disabled,
.btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.hero-readout {
  display: grid;
  gap: 0.85rem;
  padding: 1rem 0 0.35rem;
  border-top: 1px solid var(--line);
  animation: rise 0.8s var(--ease) both;
  animation-delay: 0.05s;
}

.readout-main {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.readout-num {
  font-family: "IBM Plex Mono", monospace;
  font-size: clamp(3.6rem, 12vw, 6.2rem);
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 0.85;
  font-variant-numeric: tabular-nums;
  transition: color 0.45s var(--ease);
}

.readout-num.is-idle { color: rgba(242, 242, 244, 0.28); }
.readout-num.is-down { color: var(--down); }
.readout-num.is-up { color: var(--up); }
.readout-num.is-ping { color: var(--ping); }

.readout-meta {
  display: grid;
  gap: 0.15rem;
}

.unit {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95rem;
  color: var(--mute);
}

.phase {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: lowercase;
  color: var(--ink);
  transition: opacity 0.3s ease;
}

.status {
  color: var(--mute);
  font-size: 0.95rem;
  font-weight: 600;
  min-height: 1.4em;
  transition: opacity 0.35s ease;
}

.uses {
  color: var(--mute);
  font-size: 0.95rem;
  font-weight: 600;
}

.uses span {
  color: var(--ink);
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
}

.charts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  animation: rise 0.85s var(--ease) both;
  animation-delay: 0.1s;
}

@media (min-width: 820px) {
  .charts { grid-template-columns: 1fr 1fr; }
}

.chart-panel {
  margin: 0;
  padding: 1rem 1rem 0.65rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition:
    border-color 0.4s var(--ease),
    background 0.4s var(--ease),
    transform 0.45s var(--ease);
}

.chart-panel.is-active {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.045);
}

.chart-panel figcaption {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
  font-size: 0.9rem;
  font-weight: 700;
}

.chart-panel figcaption strong {
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
  font-size: 0.82rem;
  color: var(--mute);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  transition: color 0.35s ease;
}

.chart-panel.is-down figcaption strong { color: var(--down); }
.chart-panel.is-up figcaption strong { color: var(--up); }

.chart-panel canvas {
  width: 100%;
  height: 240px;
  display: block;
}

.results {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  animation: rise 0.9s var(--ease) both;
  animation-delay: 0.14s;
}

@media (min-width: 720px) {
  .results { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.stat {
  padding: 1rem 1rem 0.9rem;
  background: var(--panel);
  border: 1px solid var(--line);
}

.stat-k {
  display: block;
  color: var(--mute);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.stat-v {
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  transition: color 0.4s var(--ease);
}

.stat-v small {
  margin-left: 0.3rem;
  font-size: 0.72rem;
  color: var(--mute);
}

.latency {
  display: grid;
  gap: 0.65rem;
  animation: rise 0.95s var(--ease) both;
  animation-delay: 0.18s;
}

.latency canvas {
  height: 128px;
}

.latency-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 700;
}

.mono {
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
  color: var(--mute);
  font-variant-numeric: tabular-nums;
}

.latency.is-active {
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.045);
}

.foot {
  color: var(--mute);
  font-size: 0.85rem;
  font-weight: 600;
  animation: rise 1s var(--ease) both;
  animation-delay: 0.22s;
}

code {
  font-family: "IBM Plex Mono", monospace;
  color: var(--ink);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}