:root {
  --bg: #0b1020;
  --bg-soft: #121a33;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-strong: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.11);
  --text: #eef2ff;
  --text-dim: #9aa6c7;
  --accent: #38e0b0;
  --accent-2: #4f8cff;
  --danger: #ff6b6b;
  --track: rgba(255, 255, 255, 0.09);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --btn-bg: linear-gradient(135deg, #38e0b0, #4f8cff);
  --btn-text: #04231b;
  --radius: 16px;
}

:root[data-theme="light"] {
  --bg: #f5f7fc;
  --bg-soft: #ffffff;
  --border: rgba(16, 24, 48, 0.12);
  --text: #101830;
  --text-dim: #5a6684;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --accent: #0a7d5e;
  --accent-2: #2456c9;
  --track: rgba(16, 24, 48, 0.1);
  --shadow: 0 20px 44px rgba(16, 24, 48, 0.12);
  --btn-bg: linear-gradient(135deg, #0b7a5c, #1e4fd8);
  --btn-text: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1100px 600px at 50% -240px, color-mix(in srgb, var(--accent-2) 22%, transparent), transparent),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.wrap {
  width: min(1060px, 100% - 2rem);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #05221a;
  padding: 0.6rem 1rem;
  border-radius: 0 0 10px 0;
  z-index: 10;
}
.skip-link:focus { left: 0; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  text-decoration: none;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.brand strong { color: var(--accent); font-weight: 700; }
.brand-mark { width: 30px; height: 30px; color: var(--accent); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.site-nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--text); }

.theme-toggle {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}
.theme-toggle:hover { background: var(--surface-strong); }

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 0 1.5rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.12;
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
}
.hero-sub {
  margin: 0 auto;
  max-width: 34rem;
  color: var(--text-dim);
}

/* Tester card */
.tester {
  background: linear-gradient(180deg, var(--surface-strong), var(--surface));
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 4vw, 2.5rem);
  text-align: center;
}

.gauge-area {
  position: relative;
  max-width: 430px;
  margin-inline: auto;
}

.gauge {
  width: min(430px, 100%);
  height: auto;
  display: block;
  margin: 0 auto;
  overflow: visible;
}

.gauge-track {
  fill: none;
  stroke: var(--track);
  stroke-width: 16;
  stroke-linecap: round;
}

.gauge-fill {
  fill: none;
  stroke: url(#arcGradient);
  stroke-width: 16;
  stroke-linecap: round;
  stroke-dasharray: 1 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 140ms linear;
}

.gauge-ticks text {
  fill: var(--text-dim);
  font-size: 11px;
  text-anchor: middle;
  font-variant-numeric: tabular-nums;
}
.gauge-ticks line { stroke: var(--track); stroke-width: 2; }

.gauge-marker {
  transform-origin: 160px 176px;
  transform: rotate(-90deg);
  transition: transform 140ms cubic-bezier(0.22, 1, 0.36, 1);
}
.gauge-marker circle {
  fill: var(--bg-soft);
  stroke: var(--accent);
  stroke-width: 4;
}

.gauge-readout {
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: 7%;
  pointer-events: none;
}

.phase-label {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--text-dim);
  min-height: 1.2em;
}

.reading {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.4rem;
}

.reading-value {
  font-size: clamp(2.4rem, 8vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.reading-unit { color: var(--text-dim); font-size: 1rem; }

/* Start button */
.start-btn {
  margin-top: 1.5rem;
  border: none;
  cursor: pointer;
  border-radius: 999px;
  padding: 0.95rem 2.75rem;
  font-size: 1.05rem;
  font-weight: 650;
  color: var(--btn-text);
  background: var(--btn-bg);
  box-shadow: 0 10px 28px color-mix(in srgb, var(--accent) 30%, transparent);
  transition: transform 120ms ease, box-shadow 160ms ease, opacity 160ms ease;
}
.start-btn:hover:not(:disabled) { transform: translateY(-1px); }
.start-btn:active:not(:disabled) { transform: translateY(1px); }
.start-btn:disabled { opacity: 0.55; cursor: progress; }
.start-btn.is-abort {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
  cursor: pointer;
}

.status-line {
  color: var(--text-dim);
  font-size: 0.92rem;
  min-height: 1.5em;
  margin: 0.9rem 0 0;
}
.status-line.is-error { color: var(--danger); }

/* Results */
.results {
  margin-top: 1.75rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 0.75rem;
  transition: border-color 200ms ease, background 200ms ease;
}
.result-card.is-active {
  border-color: color-mix(in srgb, var(--accent) 60%, transparent);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
}

.result-head {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  color: var(--text-dim);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.result-head svg { width: 16px; height: 16px; }

.result-value {
  margin-top: 0.3rem;
  font-size: 1.6rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.result-value small {
  font-size: 0.72rem;
  color: var(--text-dim);
  font-weight: 500;
  margin-left: 0.25rem;
}

.verdict {
  margin-top: 1.25rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  font-size: 0.95rem;
  text-align: left;
}
.verdict strong { color: var(--accent); }

.connection-meta {
  margin-top: 1.1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem 1.25rem;
  color: var(--text-dim);
  font-size: 0.82rem;
}
.meta-item strong { color: var(--text); font-weight: 600; }

.tester-actions {
  margin-top: 1.1rem;
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.ghost-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  padding: 0.5rem 1.25rem;
  font-size: 0.9rem;
  cursor: pointer;
}
.ghost-btn:hover { background: var(--surface-strong); }

.link-btn {
  border: none;
  background: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.82rem;
  text-decoration: underline;
  padding: 0;
  margin-left: 0.6rem;
}
.link-btn:hover { color: var(--text); }

/* History */
.history { margin-top: 2.5rem; }
.history h2 {
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  margin-bottom: 0.6rem;
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  min-width: 480px;
}
th, td {
  text-align: left;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
th { color: var(--text-dim); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; }
tbody tr:last-child td { border-bottom: none; }

.history-note { color: var(--text-dim); font-size: 0.8rem; margin-top: 0.5rem; }

/* Prose sections */
.prose { margin-top: 3rem; }
.prose h2 { font-size: 1.45rem; letter-spacing: -0.02em; }
.prose p { color: var(--text-dim); }

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  list-style: none;
  padding: 0;
  counter-reset: step;
}
.steps li {
  counter-increment: step;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem;
}
.steps li h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}
.steps li h3::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  color: var(--accent);
  font-size: 0.78rem;
  flex: none;
}
.steps li p { margin: 0; font-size: 0.92rem; }

.fineprint { font-size: 0.85rem; }

details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 0.6rem;
  background: var(--surface);
}
summary { cursor: pointer; font-weight: 600; }
details p { margin: 0.6rem 0 0; font-size: 0.93rem; }

.site-footer {
  margin-top: 3.5rem;
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}
.site-footer p { margin: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

@media (max-width: 640px) {
  .results { grid-template-columns: repeat(2, 1fr); }
  .site-nav a { display: none; }
  .reading-value { font-size: clamp(2rem, 11vw, 2.8rem); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 1ms !important; }
}

/* ------------------------------------------------------------- content pages */

.page-head { padding: 2.5rem 0 1rem; }
.page-head h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); letter-spacing: -0.03em; margin: 0 0 0.5rem; }

.page-prose {
  max-width: 44rem;
  margin-inline: auto;
  padding-top: 2.5rem;
}
.page-prose h1 {
  font-size: clamp(1.8rem, 4.6vw, 2.5rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin: 0 0 0.6rem;
}
.page-prose h2 {
  font-size: 1.3rem;
  margin-top: 2.2rem;
  letter-spacing: -0.02em;
}
.page-prose h3 {
  font-size: 1.05rem;
  margin-top: 1.5rem;
  margin-bottom: 0.3rem;
}
.page-prose p,
.page-prose li { color: var(--text-dim); }
.page-prose strong { color: var(--text); }
.page-prose ul,
.page-prose ol { padding-left: 1.2rem; }
.page-prose li { margin-bottom: 0.4rem; }
.page-prose a { color: var(--accent); }
.page-prose code {
  background: var(--surface-strong);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.1em 0.38em;
  font-size: 0.88em;
}
.page-prose .table-scroll { margin: 1.1rem 0; }

.lede {
  font-size: 1.08rem;
  line-height: 1.65;
  color: var(--text-dim);
}
.page-meta {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-top: 0;
}

.callout {
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  padding: 0.8rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text) !important;
}

.breadcrumb {
  padding-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  max-width: 44rem;
  margin-inline: auto;
}
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--text); }
.breadcrumb span { margin: 0 0.35rem; }

/* Guide listing */
.guide-grid {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
}
.guide-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 180ms ease, transform 180ms ease;
}
.guide-card:hover { border-color: color-mix(in srgb, var(--accent) 55%, transparent); transform: translateY(-2px); }
.guide-card h2,
.guide-card h3 { margin: 0 0 0.45rem; font-size: 1.05rem; line-height: 1.35; }
.guide-card a { color: var(--text); text-decoration: none; }
.guide-card a:hover { color: var(--accent); }
.guide-card p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }
.guide-more {
  display: inline-block;
  margin-top: 0.7rem;
  font-size: 0.82rem;
  color: var(--accent);
}

.guide-teaser { margin-top: 3rem; }
.guide-teaser h2 { font-size: 1.45rem; letter-spacing: -0.02em; }

.related {
  max-width: 44rem;
  margin: 2.5rem auto 0;
}
.related h2 { font-size: 1.1rem; }
.related ul { padding-left: 1.2rem; }
.related a { color: var(--accent); }

.inline-cta {
  max-width: 44rem;
  margin: 2.5rem auto 0;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
}
.inline-cta h2 { margin-top: 0; font-size: 1.15rem; }
.inline-cta p { color: var(--text-dim); }

.cta-link {
  display: inline-block;
  margin-top: 0.4rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  text-decoration: none;
  font-weight: 650;
  border-radius: 999px;
  padding: 0.7rem 1.75rem;
}
.cta-link:hover { filter: brightness(1.05); }

.contact-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.contact-card h2 { margin-top: 0; }
.contact-email { font-size: 1.15rem; }
.contact-email a { color: var(--accent); }

.error-page { text-align: center; padding-top: 4rem; }
.error-code {
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0;
  line-height: 1;
}
.error-page ul { list-style: none; padding: 0; }

/* ------------------------------------------------------------------ ad slots */

/*
 * An unconfigured or unfilled slot collapses to nothing, so there is never a
 * blank reserved box in the layout.
 */
.ad-slot {
  margin: 2rem auto 0;
  max-width: 44rem;
  text-align: center;
}
.ad-slot:not(.is-filled) { display: none; }
.ad-label {
  display: block;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
}

/* -------------------------------------------------------------- consent banner */

.consent-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  box-shadow: 0 -12px 36px rgba(0, 0, 0, 0.28);
  padding: 1rem;
}
.consent-inner {
  width: min(1060px, 100%);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.consent-text { flex: 1 1 22rem; }
.consent-text strong { display: block; margin-bottom: 0.2rem; }
.consent-text p { margin: 0; font-size: 0.87rem; color: var(--text-dim); }
.consent-text a { color: var(--accent); }
.consent-actions {
  display: flex;
  gap: 0.6rem;
  flex: 0 0 auto;
}
.consent-accept {
  margin-top: 0;
  padding: 0.6rem 1.6rem;
  font-size: 0.95rem;
}
body.has-consent-banner .site-footer { padding-bottom: 7rem; }

/* ----------------------------------------------------------------- footer nav */

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.4rem;
  margin-bottom: 0.8rem;
}
.footer-nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.88rem;
}
.footer-nav a:hover { color: var(--text); }
.footer-legal { max-width: 40rem; margin-inline: auto; }

.site-nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

@media (max-width: 640px) {
  /* Keep every nav link reachable on a phone by giving the nav its own row
     instead of hiding links, which would cost crawlable internal navigation. */
  .header-inner {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.4rem;
    padding-bottom: 0.6rem;
  }
  .site-nav {
    width: 100%;
    justify-content: center;
    gap: 0.85rem;
  }
  .site-nav a { display: inline; font-size: 0.82rem; }
  .theme-toggle { width: 30px; height: 30px; font-size: 0.85rem; }
  .consent-actions { width: 100%; }
  .consent-actions button { flex: 1; }
  .page-prose { padding-top: 1.5rem; }
}