/* NetHealthLab design tokens (docs/design-system.md). Dark only. */
:root {
  --bg: #0b1020;
  --card: #171b26;
  --card-border: #252b3a;
  --primary: #315bff;
  --primary-hover: #4a6eff;
  --secondary: #7c3aed;
  --text: #eef1f8;
  --muted: #a3abbf;
  --faint: #7d869c;
  --good: #34d399;
  --fair: #fbbf24;
  --poor: #f87171;
  --focus: #9db2ff;
  --link: #9db2ff;
  --radius-card: 16px;
  --radius-btn: 14px;
  --gutter: 20px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(120% 60% at 50% -10%, rgba(49, 91, 255, 0.16), transparent 60%),
    radial-gradient(80% 40% at 100% 0%, rgba(124, 58, 237, 0.1), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
p,
dl,
dd,
ol {
  margin: 0;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 6px;
}

[tabindex='-1']:focus {
  outline: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  z-index: 10;
}

.skip-link:focus {
  top: 12px;
}

/* Layout */
.topbar,
main,
.footer {
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left));
  padding-right: max(var(--gutter), env(safe-area-inset-right));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: max(18px, env(safe-area-inset-top));
  padding-bottom: 8px;
}

.topnav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 4px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.topnav a:hover,
.topnav a[aria-current='page'] {
  color: var(--text);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 26px;
  height: 26px;
  padding: 4px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-bottom: 32px;
}

.view {
  display: flex;
  flex-direction: column;
  animation: enter 220ms ease-out;
}

.view[hidden] {
  display: none;
}

@keyframes enter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

.footer {
  display: grid;
  gap: 10px;
  padding-top: 20px;
  padding-bottom: max(24px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--card-border);
  color: var(--faint);
  font-size: 13px;
  text-align: center;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--text);
  text-decoration: underline;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 56px;
  padding: 14px 20px;
  border: 0;
  border-radius: var(--radius-btn);
  cursor: pointer;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.06em;
  transition:
    background-color 150ms ease,
    transform 100ms ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 8px 24px rgba(49, 91, 255, 0.28);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-ghost {
  min-height: 48px;
  margin-top: 8px;
  color: var(--muted);
  background: transparent;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.btn-ghost:hover {
  color: var(--text);
}

/* The check's screens fill the first viewport, so the guide below never pushes the CTA down. */
.view-home,
.view-testing,
.view-error {
  min-height: min(640px, calc(100vh - 140px));
  min-height: min(640px, calc(100svh - 140px));
}

/* Landing */
.view-home {
  flex: 1;
  justify-content: center;
  text-align: center;
  gap: 16px;
  padding: 32px 0 12px;
}

.view-home h1 {
  font-size: clamp(34px, 9.5vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 800;
}

.lead {
  color: var(--muted);
  font-size: 18px;
}

.view-home .btn {
  margin-top: 20px;
}

.note {
  color: var(--faint);
  font-size: 14px;
}

/* Testing */
.view-testing {
  flex: 1;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 20px;
  padding: 24px 0 8px;
}

.view-testing h2 {
  font-size: 26px;
  letter-spacing: -0.02em;
  font-weight: 750;
}

.pulse {
  position: relative;
  width: 120px;
  height: 120px;
  margin-bottom: 4px;
}

.pulse span {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--primary);
  opacity: 0;
  animation: ripple 2.4s ease-out infinite;
}

.pulse span:nth-child(2) {
  animation-delay: 0.8s;
}

.pulse span:nth-child(3) {
  animation-delay: 1.6s;
}

.pulse::after {
  content: '';
  position: absolute;
  inset: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  box-shadow: 0 0 32px rgba(49, 91, 255, 0.45);
}

@keyframes ripple {
  0% {
    transform: scale(0.35);
    opacity: 0.9;
  }
  100% {
    transform: scale(1);
    opacity: 0;
  }
}

.stages {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 10px;
  width: 100%;
  max-width: 280px;
  text-align: left;
}

.stages li {
  position: relative;
  padding-left: 30px;
  color: var(--faint);
  font-size: 16px;
  transition: color 200ms ease;
}

.stages li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 50%;
  width: 14px;
  height: 14px;
  margin-top: -7px;
  border-radius: 50%;
  border: 2px solid var(--card-border);
}

.stages li.is-active {
  color: var(--text);
  font-weight: 600;
}

.stages li.is-active::before {
  border-color: var(--primary);
  border-top-color: transparent;
  animation: spin 0.9s linear infinite;
}

.stages li.is-done {
  color: var(--muted);
}

.stages li.is-done::before {
  border-color: var(--good);
  background: var(--good);
  box-shadow: inset 0 0 0 3px var(--card);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Result */
.view-result {
  gap: 16px;
  padding-top: 8px;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  padding: 20px;
}

.eyebrow {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.score-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-top: 22px;
}

.score {
  position: relative;
  width: 168px;
  height: 168px;
}

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

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

.ring-track {
  stroke: #232a3b;
}

.ring-value {
  stroke: var(--rating-color, var(--primary));
  stroke-linecap: round;
  stroke-dasharray: 0 100;
  transition: stroke-dasharray 900ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.score-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  padding-top: 52px;
}

.score-value {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.score-max {
  margin-left: 2px;
  color: var(--faint);
  font-size: 18px;
  font-weight: 600;
}

.rating {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--rating-color, var(--text));
  background: color-mix(in srgb, var(--rating-color, var(--text)) 14%, transparent);
  font-weight: 800;
  letter-spacing: 0.1em;
  font-size: 15px;
}

.rating::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

[data-rating='excellent'],
[data-rating='good'] {
  --rating-color: var(--good);
}

[data-rating='fair'] {
  --rating-color: var(--fair);
}

[data-rating='poor'] {
  --rating-color: var(--poor);
}

.finding {
  font-size: 20px;
  line-height: 1.4;
  font-weight: 650;
  letter-spacing: -0.01em;
  padding: 4px 2px;
}

.action-card {
  display: grid;
  gap: 8px;
  border-left: 4px solid var(--primary);
}

.action-card p {
  color: var(--text);
}

.section-title {
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.metric {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  padding: 14px 16px;
  min-width: 0;
}

.metric dt {
  color: var(--muted);
  font-size: 14px;
}

.metric dd {
  margin-top: 2px;
  font-size: 28px;
  font-weight: 750;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.metric .unit {
  color: var(--faint);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0;
}

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

.metric-note {
  margin-top: 2px;
  color: var(--muted);
  font-size: 14px;
}

.metric-note:empty {
  display: none;
}

.fineprint {
  color: var(--faint);
  font-size: 13px;
}

.view-result .btn-primary {
  margin-top: 8px;
}

.result-link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--link);
  font-size: 15px;
  font-weight: 600;
  text-underline-offset: 3px;
}

/* Error */
.view-error {
  flex: 1;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 14px;
  padding: 24px 0;
}

.view-error h2 {
  font-size: 26px;
  letter-spacing: -0.02em;
  font-weight: 750;
}

.view-error .btn {
  margin-top: 16px;
}

.error-icon {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  color: var(--fair);
  background: color-mix(in srgb, var(--fair) 14%, transparent);
  font-size: 32px;
  font-weight: 800;
}

/* Debug (development only) */
.debug {
  margin-top: 24px;
}

.debug summary {
  min-height: 44px;
  display: flex;
  align-items: center;
  color: var(--faint);
  cursor: pointer;
}

.debug pre {
  max-height: 60vh;
  overflow: auto;
  padding: 12px;
  border-radius: 12px;
  background: #0f1422;
  border: 1px solid var(--card-border);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Home guide (below the check) and long-form pages */
.guide {
  display: grid;
  gap: 14px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--card-border);
}

.guide h2,
.prose h2 {
  margin-top: 18px;
  font-size: 21px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 750;
}

.guide h2:first-child {
  margin-top: 0;
}

.guide p,
.guide li,
.guide dd,
.prose p,
.prose li,
.prose dd {
  color: #c9cfdd;
}

.guide ul,
.prose ul,
.prose ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
}

.guide-terms {
  display: grid;
  gap: 4px;
}

.guide-terms dt,
.prose dt {
  margin-top: 8px;
  color: var(--text);
  font-weight: 700;
}

.guide-terms dd,
.prose dd {
  margin: 0;
}

.guide a,
.prose a {
  color: var(--link);
  text-underline-offset: 3px;
}

.link-list {
  list-style: none;
  padding-left: 0 !important;
}

.link-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-weight: 600;
}

.page-doc .topbar,
.page-doc main,
.page-doc .footer {
  max-width: 720px;
}

.prose {
  display: grid;
  gap: 14px;
  padding: 16px 0 24px;
}

.prose h1 {
  font-size: clamp(30px, 7.5vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 800;
}

.prose h3 {
  margin-top: 8px;
  font-size: 17px;
  font-weight: 700;
}

.prose .updated {
  color: var(--faint);
  font-size: 14px;
}

.prose .intro {
  color: var(--muted);
  font-size: 18px;
}

.prose strong,
.guide strong {
  color: var(--text);
}

.prose .callout {
  padding: 16px 18px;
  border: 1px solid var(--card-border);
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  background: var(--card);
}

.prose .callout p {
  color: var(--text);
}

.prose .status-line {
  font-weight: 700;
  color: var(--text);
}

.cta-block {
  display: grid;
  gap: 10px;
  margin-top: 16px;
  padding: 20px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  background: var(--card);
  text-align: center;
}

.cta-block p {
  color: var(--muted);
}

a.btn {
  text-decoration: none;
}

.noscript {
  max-width: 520px;
  margin: 0 auto 24px;
  padding: 0 20px;
  color: var(--fair);
  text-align: center;
}

/* Larger screens: same single column, a little more air. */
@media (min-width: 640px) {
  :root {
    --gutter: 24px;
  }

  .view-home {
    padding-top: 64px;
  }

  .metrics {
    grid-template-columns: repeat(3, 1fr);
  }

  .metric-wide {
    grid-column: span 2;
  }
}

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

  .pulse span {
    opacity: 0.35;
    transform: scale(0.8);
  }
}