:root {
  color-scheme: dark;
  --bg: #080b12;
  --bg-soft: #111827;
  --text: #f8fafc;
  --muted: #aeb9c9;
  --panel: rgba(15, 23, 42, 0.68);
  --panel-strong: rgba(17, 24, 39, 0.86);
  --border: rgba(255, 255, 255, 0.16);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  --accent: #39d2c0;
  --accent-strong: #64f2b8;
  --accent-contrast: #061314;
  --warning: #f7ba45;
  --danger: #ff6b7a;
  --particle: rgba(116, 240, 214, 0.64);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #edf4f8;
  --bg-soft: #ffffff;
  --text: #111827;
  --muted: #526172;
  --panel: rgba(255, 255, 255, 0.68);
  --panel-strong: rgba(255, 255, 255, 0.9);
  --border: rgba(15, 23, 42, 0.13);
  --shadow: 0 24px 70px rgba(39, 55, 77, 0.16);
  --accent: #0c9f92;
  --accent-strong: #2fbf71;
  --accent-contrast: #f8fffd;
  --warning: #b7791f;
  --danger: #c9354b;
  --particle: rgba(15, 23, 42, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background:
    radial-gradient(circle at 16% 18%, rgba(57, 210, 192, 0.18), transparent 28rem),
    radial-gradient(circle at 86% 12%, rgba(247, 186, 69, 0.12), transparent 24rem),
    linear-gradient(135deg, var(--bg), var(--bg-soft));
}

button,
input {
  font: inherit;
}

#particles-js,
#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 32px 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 4.8rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.theme-switch {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.switch-label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.theme-switch input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.switch-track {
  position: relative;
  width: 62px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.13);
  box-shadow: inset 0 1px 8px rgba(0, 0, 0, 0.18);
  transition: background 180ms ease, border-color 180ms ease;
}

.switch-thumb {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
  transition: transform 180ms ease, background 180ms ease;
}

.theme-switch input:checked + .switch-track {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.theme-switch input:checked + .switch-track .switch-thumb {
  transform: translateX(28px);
  background: #f7fffc;
}

.theme-switch input:focus-visible + .switch-track,
.start-button:focus-visible,
.share-button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 62%, transparent);
  outline-offset: 4px;
}

.speed-card {
  width: 100%;
  margin: auto 0;
  padding: clamp(20px, 4vw, 36px);
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(220px, 360px) 1fr;
  align-items: center;
  gap: clamp(24px, 5vw, 52px);
}

.dial {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 320px;
}

.start-button {
  position: relative;
  z-index: 2;
  width: min(76vw, 240px);
  aspect-ratio: 1;
  border: 0;
  border-radius: 50%;
  color: var(--accent-contrast);
  background:
    radial-gradient(circle at 35% 24%, rgba(255, 255, 255, 0.86), transparent 0 18%, rgba(255, 255, 255, 0) 36%),
    linear-gradient(135deg, var(--accent-strong), var(--accent));
  box-shadow: 0 22px 48px color-mix(in srgb, var(--accent) 34%, transparent);
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}

.start-button span {
  display: block;
  font-size: clamp(1.5rem, 6vw, 2.65rem);
  font-weight: 850;
}

.start-button:hover {
  transform: translateY(-2px) scale(1.015);
}

.start-button:disabled {
  cursor: wait;
  opacity: 0.72;
  transform: none;
}

.pulse-ring {
  position: absolute;
  width: min(88vw, 310px);
  aspect-ratio: 1;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, transparent);
  border-radius: 50%;
  animation: pulse 2.8s ease-in-out infinite;
}

.status-block {
  min-width: 0;
}

.status-text {
  min-height: 3.2em;
  margin: 0 0 18px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.55;
}

.progress-shell {
  width: 100%;
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(127, 140, 154, 0.22);
}

.progress-bar {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong), var(--warning));
  transition: width 180ms ease;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.metric-card {
  min-width: 0;
  min-height: 128px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel-strong);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
}

.metric-label,
.metric-unit {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.metric-card strong {
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: clamp(1.45rem, 4vw, 2.5rem);
  line-height: 1;
}

.metric-card-wide strong {
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  line-height: 1.18;
}

.ip-provider {
  display: grid;
  gap: 6px;
}

#provider-value {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 750;
  line-height: 1.25;
}

.share-section {
  display: flex;
  justify-content: center;
  margin-top: 24px;
}

.share-section[hidden] {
  display: none;
}

.share-button,
.result-action {
  min-height: 48px;
  border: 0;
  border-radius: 999px;
  padding: 0 22px;
  color: var(--accent-contrast);
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  box-shadow: 0 16px 34px color-mix(in srgb, var(--accent) 24%, transparent);
  cursor: pointer;
  font-weight: 850;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.share-button:hover,
.result-action:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px color-mix(in srgb, var(--accent) 30%, transparent);
}

.privacy-note {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.is-error {
  color: var(--danger);
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(0.92);
    opacity: 0.38;
  }
  50% {
    transform: scale(1.04);
    opacity: 0.78;
  }
}

@media (max-width: 900px) {
  .hero-panel {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .dial {
    min-height: 260px;
  }

  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .metric-card-wide {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .page-shell {
    width: min(100% - 24px, 1120px);
    padding: 18px 0;
    gap: 18px;
  }

  .topbar {
    align-items: flex-start;
  }

  .switch-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
  }

  .speed-card {
    border-radius: 18px;
  }

  .metric-grid {
    grid-template-columns: 1fr;
  }

  .metric-card {
    min-height: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}


#particles-js canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

/* PARTICLES JS FORCE VISIBILITY */
#particles-js {
  position: fixed !important;
  inset: 0 !important;
  z-index: 0 !important;
  width: 100% !important;
  height: 100% !important;
  overflow: hidden !important;
  pointer-events: none !important;
}

#particles-js .particles-js-canvas-el,
#particles-js canvas {
  position: absolute !important;
  inset: 0 !important;
  display: block !important;
  width: 100% !important;
  height: 100% !important;
}

/* PARTICLES LAYER HARD FIX */
#particles-js {
  position: fixed !important;
  inset: 0 !important;
  width: 100% !important;
  height: 100% !important;
  z-index: 1 !important;
  overflow: hidden !important;
  pointer-events: none !important;
}

#particles-js .particles-js-canvas-el,
#particles-js canvas {
  position: absolute !important;
  inset: 0 !important;
  display: block !important;
  width: 100% !important;
  height: 100% !important;
  opacity: 1 !important;
}

.page-shell {
  z-index: 2 !important;
}


/* TRANSPARENT TEST PANEL */
.speed-card {
  background: transparent !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  border-color: transparent !important;
}

.hero-panel,
.metric-grid,
.privacy-note {
  position: relative;
  z-index: 3;
}

.metric-card {
  background: color-mix(in srgb, var(--panel-strong) 72%, transparent) !important;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

[data-theme="light"] .metric-card {
  background: rgba(255, 255, 255, 0.72) !important;
}

[data-theme="dark"] .metric-card {
  background: rgba(17, 24, 39, 0.58) !important;
}

/* SOFT GLASS TEST PANEL */
.speed-card {
  background: rgba(8, 11, 18, 0.28) !important;
  border-color: rgba(116, 240, 214, 0.16) !important;
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.26) !important;
  backdrop-filter: blur(18px) saturate(135%) !important;
  -webkit-backdrop-filter: blur(18px) saturate(135%) !important;
}

[data-theme="light"] .speed-card {
  background: rgba(255, 255, 255, 0.24) !important;
  border-color: rgba(15, 23, 42, 0.12) !important;
  box-shadow: 0 28px 90px rgba(39, 55, 77, 0.16) !important;
  backdrop-filter: blur(18px) saturate(130%) !important;
  -webkit-backdrop-filter: blur(18px) saturate(130%) !important;
}

[data-theme="dark"] .speed-card {
  background: rgba(8, 11, 18, 0.30) !important;
  border-color: rgba(116, 240, 214, 0.18) !important;
}

/* LIGHTER SOFT GLASS TEST PANEL */
.speed-card {
  background: rgba(8, 11, 18, 0.14) !important;
  border-color: rgba(116, 240, 214, 0.13) !important;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.16) !important;
  backdrop-filter: blur(8px) saturate(120%) !important;
  -webkit-backdrop-filter: blur(8px) saturate(120%) !important;
}

[data-theme="dark"] .speed-card {
  background: rgba(8, 11, 18, 0.14) !important;
  border-color: rgba(116, 240, 214, 0.13) !important;
}

[data-theme="light"] .speed-card {
  background: rgba(255, 255, 255, 0.14) !important;
  border-color: rgba(15, 23, 42, 0.10) !important;
  box-shadow: 0 22px 70px rgba(39, 55, 77, 0.10) !important;
  backdrop-filter: blur(8px) saturate(115%) !important;
  -webkit-backdrop-filter: blur(8px) saturate(115%) !important;
}