:root {
  color-scheme: light dark;
  --anchor: #1999e8;
  --anchor-deep: #0878bd;
  --anchor-soft: #d9f0ff;
  --accent: #8be8f4;
  --ink: #081c2b;
  --ink-soft: #3f596b;
  --muted: #587180;
  --surface: #f8fcff;
  --surface-alt: #eef8ff;
  --surface-raised: #ffffff;
  --line: #cfe2ed;
  --line-strong: #a9cadb;
  --dark-panel: #071a28;
  --dark-panel-2: #0c2638;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(14, 74, 112, 0.16);
  --display: "Space Grotesk", sans-serif;
  --body: "Inter", sans-serif;
  --measure: 1180px;
  --radius-small: 12px;
  --radius-medium: 20px;
  --radius-large: 32px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --anchor: #42b7ff;
    --anchor-deep: #74cbff;
    --anchor-soft: #0a3550;
    --accent: #8be8f4;
    --ink: #edf8ff;
    --ink-soft: #b3cad8;
    --muted: #8ea6b5;
    --surface: #07121b;
    --surface-alt: #0a1b28;
    --surface-raised: #0d2332;
    --line: #1d3b4d;
    --line-strong: #315970;
    --dark-panel: #020a10;
    --dark-panel-2: #092335;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--anchor);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 15px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--surface);
  transform: translateY(-150%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  box-shadow: 0 8px 28px rgba(10, 58, 88, 0.06);
}

.nav-shell,
.section-shell,
.hero-shell,
.footer-shell {
  width: min(calc(100% - 40px), var(--measure));
  margin-inline: auto;
}

.nav-shell {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand,
.footer-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.brand {
  min-width: 44px;
  min-height: 44px;
}

.brand img,
.footer-brand img {
  border-radius: 10px;
  box-shadow: 0 5px 14px rgba(25, 153, 232, 0.24);
}

.nav-actions,
.nav-links {
  display: flex;
  align-items: center;
}

.nav-actions {
  gap: 24px;
}

.nav-links {
  gap: 4px;
}

.nav-links a {
  min-height: 44px;
  display: grid;
  place-items: center;
  padding: 0 13px;
  color: var(--ink-soft);
  font-size: 0.875rem;
  font-weight: 600;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--anchor-deep);
}

.nav-links a.is-active {
  text-decoration: underline;
  text-decoration-color: var(--anchor);
  text-decoration-thickness: 2px;
  text-underline-offset: 7px;
}

.nav-cta {
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 17px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--surface);
  font-size: 0.875rem;
  font-weight: 700;
}

.nav-cta svg {
  width: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 180ms ease;
}

.nav-cta:hover svg {
  transform: translateX(3px);
}

.hero {
  position: relative;
  padding: clamp(54px, 8vw, 108px) 0 clamp(70px, 9vw, 120px);
  background:
    radial-gradient(circle at 76% 42%, color-mix(in srgb, var(--anchor) 11%, transparent), transparent 32%),
    linear-gradient(180deg, var(--surface), var(--surface-alt));
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.14;
  pointer-events: none;
  background-image: radial-gradient(var(--line-strong) 0.7px, transparent 0.7px);
  background-size: 18px 18px;
  mask-image: linear-gradient(to bottom, transparent, black 18%, black 75%, transparent);
}

.hero-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(430px, 1.08fr);
  align-items: center;
  gap: clamp(50px, 7vw, 96px);
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.eyebrow,
.feature-kicker {
  margin: 0 0 16px;
  color: var(--anchor-deep);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  display: inline-block;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--anchor);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--anchor) 14%, transparent);
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  margin-top: 0;
  font-family: var(--display);
  line-height: 1.06;
  letter-spacing: -0.045em;
}

h1 {
  max-width: 720px;
  margin-bottom: 24px;
  font-size: clamp(2.85rem, 5.8vw, 5.65rem);
  text-wrap: balance;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(2.15rem, 4.1vw, 4rem);
  text-wrap: balance;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(1.25rem, 1.8vw, 1.65rem);
}

.hero-lede {
  max-width: 630px;
  margin: 0 0 30px;
  color: var(--ink-soft);
  font-size: clamp(1.02rem, 1.5vw, 1.17rem);
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 22px;
}

.app-store-badge {
  width: 180px;
  height: 60px;
  display: block;
  border-radius: 11px;
  transition: transform 180ms ease, filter 180ms ease;
}

.app-store-badge:hover {
  transform: translateY(-2px);
  filter: drop-shadow(0 8px 18px rgba(0, 0, 0, 0.18));
}

.text-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-weight: 700;
}

.text-link:hover {
  color: var(--anchor-deep);
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-facts li {
  display: flex;
  align-items: center;
}

.hero-facts li:not(:last-child)::after {
  content: "";
  width: 3px;
  height: 3px;
  margin: 0 13px;
  border-radius: 50%;
  background: var(--line-strong);
}

.acoustic-hero {
  position: relative;
  min-height: 580px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--accent) 24%, var(--line));
  border-radius: var(--radius-large);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.05), transparent 38%),
    var(--dark-panel);
  box-shadow: var(--shadow);
  color: var(--white);
  isolation: isolate;
}

.acoustic-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.24;
  background-image:
    linear-gradient(rgba(139, 232, 244, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 232, 244, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, black, transparent 68%);
}

.frequency-readout {
  position: absolute;
  z-index: 2;
  top: 28px;
  left: 30px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.frequency-readout > span,
.signal-labels,
.frequency-scale {
  color: rgba(220, 247, 255, 0.62);
  font-family: var(--body);
  font-size: 0.61rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.frequency-readout strong {
  max-width: 210px;
  font-family: var(--display);
  font-size: 1.15rem;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.acoustic-stage {
  position: absolute;
  inset: 62px 0 120px;
  display: grid;
  place-items: center;
}

.wave-ring {
  position: absolute;
  border: 1px solid rgba(139, 232, 244, 0.17);
  border-radius: 50%;
}

.ring-one { width: 220px; height: 220px; border-color: rgba(139, 232, 244, 0.42); }
.ring-two { width: 310px; height: 310px; }
.ring-three { width: 410px; height: 410px; }
.ring-four { width: 520px; height: 520px; opacity: 0.55; }

.icon-orbit {
  position: relative;
  z-index: 3;
  width: 184px;
  aspect-ratio: 1;
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 38px;
  background: rgba(255, 255, 255, 0.09);
  box-shadow:
    0 0 0 14px rgba(95, 196, 255, 0.05),
    0 28px 70px rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(8px);
}

.icon-orbit img {
  width: 100%;
  border-radius: 30px;
}

.signal-panel {
  position: absolute;
  z-index: 4;
  inset: auto 24px 24px;
  height: 112px;
  padding: 13px 16px 10px;
  border: 1px solid rgba(139, 232, 244, 0.2);
  border-radius: 14px;
  background: rgba(4, 18, 28, 0.88);
}

.signal-labels {
  display: flex;
  justify-content: space-between;
}

.signal-labels span:last-child {
  color: var(--accent);
}

.signal-panel svg {
  width: 100%;
  height: 72px;
  overflow: visible;
}

.signal-grid {
  fill: none;
  stroke: rgba(139, 232, 244, 0.08);
  stroke-width: 1;
}

.signal-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.25;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 0 5px rgba(139, 232, 244, 0.65));
}

.proof-ribbon {
  overflow: hidden;
  border-block: 1px solid var(--line);
  background: var(--surface-raised);
}

.proof-track {
  width: min(calc(100% - 40px), var(--measure));
  min-height: 72px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  white-space: nowrap;
}

.proof-track i {
  flex: 1 1 auto;
  height: 1px;
  max-width: 80px;
  background: var(--line);
}

.section {
  padding: clamp(88px, 11vw, 152px) 0;
}

.section-heading {
  max-width: 780px;
  margin-bottom: clamp(42px, 7vw, 74px);
}

.section-heading > p:last-child,
.process-intro > p:last-child,
.faq-intro > p:last-child {
  max-width: 680px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 1.06rem;
}

.feature-layout {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 18px;
}

.feature-primary,
.feature-secondary {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface-raised);
}

.feature-primary {
  grid-column: span 12;
  min-height: 410px;
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(380px, 1.15fr);
  align-items: stretch;
  border-radius: var(--radius-large);
}

.feature-primary-copy {
  align-self: center;
  padding: clamp(32px, 5vw, 64px);
}

.feature-primary-copy > p:last-child,
.feature-secondary > p {
  color: var(--ink-soft);
}

.feature-primary-copy > p:last-child {
  max-width: 500px;
  margin: 0;
}

.feature-kicker {
  margin: 20px 0 10px;
}

.feature-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--anchor-soft);
  color: var(--anchor-deep);
}

.feature-icon svg {
  width: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.65;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.frequency-visual {
  position: relative;
  min-height: 380px;
  padding: 50px 42px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid rgba(139, 232, 244, 0.16);
  background: var(--dark-panel);
  color: var(--white);
}

.frequency-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.4;
  background-image:
    linear-gradient(rgba(139, 232, 244, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 232, 244, 0.07) 1px, transparent 1px);
  background-size: 28px 28px;
}

.frequency-drop {
  position: relative;
  z-index: 2;
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
  align-self: center;
  margin-bottom: 34px;
  border-radius: 50%;
  background: rgba(139, 232, 244, 0.1);
  color: var(--accent);
}

.frequency-drop svg {
  width: 32px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
}

.frequency-bars {
  position: relative;
  z-index: 2;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(8px, 1.4vw, 16px);
}

.frequency-bars i {
  width: 8px;
  height: var(--h);
  border-radius: 10px;
  background: var(--accent);
  box-shadow: 0 0 16px rgba(139, 232, 244, 0.25);
}

.frequency-scale {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
}

.frequency-scale strong {
  color: var(--white);
  font-family: var(--display);
  font-size: 0.9rem;
}

.feature-secondary {
  grid-column: span 4;
  min-height: 280px;
  padding: 30px;
  border-radius: var(--radius-medium);
}

.feature-secondary h3 {
  margin-top: 26px;
}

.feature-secondary > p {
  margin: 0;
  font-size: 0.93rem;
}

.feature-meter {
  grid-column: span 5;
  padding-bottom: 78px;
  background: var(--surface-alt);
}

.feature-history {
  grid-column: span 8;
  padding-bottom: 86px;
}

.feature-meter + .feature-secondary {
  grid-column: span 3;
}

.feature-history + .feature-secondary {
  grid-column: span 4;
}

.mini-meter {
  position: absolute;
  right: 26px;
  bottom: 26px;
  left: 26px;
  height: 34px;
  display: flex;
  align-items: end;
  gap: 5px;
}

.mini-meter span {
  width: 8px;
  border-radius: 2px;
  background: var(--anchor);
}

.mini-meter span:nth-child(1) { height: 25%; opacity: 0.35; }
.mini-meter span:nth-child(2) { height: 44%; opacity: 0.5; }
.mini-meter span:nth-child(3) { height: 68%; opacity: 0.7; }
.mini-meter span:nth-child(4) { height: 92%; }
.mini-meter span:nth-child(5) { height: 58%; opacity: 0.78; }

.mini-meter b {
  margin-left: auto;
  color: var(--anchor-deep);
  font-family: var(--display);
  font-size: 1rem;
}

.history-track {
  position: absolute;
  right: 30px;
  bottom: 27px;
  left: 30px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.history-track span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.history-track i {
  width: 8px;
  height: 8px;
  border: 2px solid var(--surface-raised);
  border-radius: 50%;
  background: var(--anchor);
  box-shadow: 0 0 0 2px var(--anchor-soft);
}

.history-track b {
  height: 1px;
  flex: 1 1 auto;
  background: var(--line-strong);
}

.process {
  background: var(--dark-panel);
  color: var(--white);
}

.process-shell {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(480px, 1.2fr);
  gap: clamp(60px, 9vw, 120px);
  align-items: start;
}

.process-intro {
  position: sticky;
  top: 120px;
}

.process .eyebrow {
  color: var(--accent);
}

.process-intro > p:last-child {
  color: rgba(223, 241, 250, 0.68);
}

.process-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.process-list li {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 24px;
  padding: 32px 0;
  border-top: 1px solid rgba(139, 232, 244, 0.18);
}

.process-list li:last-child {
  border-bottom: 1px solid rgba(139, 232, 244, 0.18);
}

.step-number {
  color: var(--accent);
  font-family: var(--display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.process-list h3 {
  margin-bottom: 10px;
  font-size: 1.45rem;
}

.process-list p {
  margin: 0;
  color: rgba(223, 241, 250, 0.68);
}

.faq-shell {
  display: grid;
  grid-template-columns: minmax(300px, 0.75fr) minmax(500px, 1.25fr);
  gap: clamp(54px, 9vw, 120px);
  align-items: start;
}

.faq-intro {
  position: sticky;
  top: 120px;
}

.faq-list {
  border-top: 1px solid var(--line-strong);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 4px;
  cursor: pointer;
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary span {
  position: relative;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
}

.faq-list summary span::before,
.faq-list summary span::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 1.5px;
  background: var(--ink);
  transform: translate(-50%, -50%);
  transition: transform 180ms ease;
}

.faq-list summary span::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-list details[open] summary span::after {
  transform: translate(-50%, -50%) rotate(0);
}

.answer {
  display: grid;
  grid-template-rows: 1fr;
}

.answer p {
  max-width: 650px;
  margin: 0;
  padding: 0 48px 26px 4px;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.final-cta {
  padding: 0 20px 20px;
}

.final-cta-shell {
  position: relative;
  width: min(100%, 1380px);
  min-height: 390px;
  overflow: hidden;
  margin-inline: auto;
  padding: clamp(48px, 7vw, 86px);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(24px, 4vw, 48px);
  border-radius: var(--radius-large);
  background: var(--anchor);
  color: #03131f;
}

.final-cta-shell img {
  border-radius: 20px;
  box-shadow: 0 16px 38px rgba(3, 48, 76, 0.22);
}

.final-cta .eyebrow {
  color: #063553;
}

.final-cta h2 {
  max-width: 720px;
  margin: 0;
  color: #02131f;
}

.cta-note {
  margin: 18px 0 0;
  color: #073956;
  font-size: 0.84rem;
  font-weight: 600;
}

.cta-ripples {
  position: absolute;
  top: 50%;
  right: 16%;
  width: 700px;
  height: 700px;
  transform: translate(50%, -50%);
  opacity: 0.28;
  pointer-events: none;
}

.cta-ripples i {
  position: absolute;
  inset: 50%;
  border: 2px solid #d9f6ff;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.cta-ripples i:nth-child(1) { width: 260px; height: 260px; }
.cta-ripples i:nth-child(2) { width: 450px; height: 450px; }
.cta-ripples i:nth-child(3) { width: 680px; height: 680px; }

.final-cta-shell > *:not(.cta-ripples) {
  position: relative;
  z-index: 1;
}

.site-footer {
  padding: 42px 0;
}

.footer-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-size: 0.8rem;
}

.footer-brand {
  color: var(--ink);
  font-size: 0.88rem;
}

.footer-shell > p {
  margin: 0;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: flex-end;
  gap: 20px;
}

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

.footer-links a:hover {
  color: var(--anchor-deep);
}

.js .reveal {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 360ms ease-out, transform 360ms ease-out;
  }

  .js .reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }

  .acoustic-hero {
    animation: gentle-float 6s ease-in-out infinite;
  }

  .ring-one {
    animation: ring-breathe 2.8s ease-out infinite;
  }

  .ring-two {
    animation: ring-breathe 2.8s 0.7s ease-out infinite;
  }

  .signal-line {
    stroke-dasharray: 900;
    stroke-dashoffset: 900;
    animation: draw-signal 2.2s 0.3s ease-out forwards;
  }

  @keyframes gentle-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
  }

  @keyframes ring-breathe {
    0% { opacity: 0.55; transform: scale(0.94); }
    70%, 100% { opacity: 0.06; transform: scale(1.08); }
  }

  @keyframes draw-signal {
    to { stroke-dashoffset: 0; }
  }
}

@media (max-width: 980px) {
  .hero-shell {
    grid-template-columns: 1fr;
    gap: 54px;
  }

  .hero-copy {
    max-width: 760px;
  }

  .acoustic-hero {
    width: min(100%, 680px);
    min-height: 560px;
    margin-inline: auto;
  }

  .feature-primary {
    grid-template-columns: 1fr;
  }

  .frequency-visual {
    min-height: 340px;
    border-top: 1px solid rgba(139, 232, 244, 0.16);
    border-left: 0;
  }

  .feature-secondary,
  .feature-meter,
  .feature-meter + .feature-secondary,
  .feature-history,
  .feature-history + .feature-secondary {
    grid-column: span 6;
  }

  .process-shell,
  .faq-shell {
    grid-template-columns: 1fr;
    gap: 50px;
  }

  .process-intro,
  .faq-intro {
    position: static;
  }

  .process-intro,
  .faq-intro {
    max-width: 680px;
  }

  .final-cta-shell {
    grid-template-columns: auto 1fr;
  }

  .final-cta-shell .app-store-badge {
    grid-column: 2;
  }

  .footer-shell {
    grid-template-columns: 1fr auto;
  }

  .footer-shell > p {
    grid-column: 1 / -1;
    grid-row: 2;
    text-align: left;
  }
}

@media (max-width: 700px) {
  .nav-shell,
  .section-shell,
  .hero-shell,
  .footer-shell {
    width: min(calc(100% - 32px), var(--measure));
  }

  .nav-shell {
    min-height: 68px;
  }

  .brand img {
    width: 36px;
    height: 36px;
  }

  .brand span {
    max-width: 110px;
    font-size: 0.88rem;
    line-height: 1.15;
  }

  .nav-actions {
    gap: 8px;
  }

  .nav-links {
    display: none;
  }

  .nav-cta {
    padding-inline: 15px;
  }

  .hero {
    padding-top: 46px;
  }

  h1 {
    font-size: clamp(2.65rem, 13.2vw, 4.1rem);
  }

  .hero-actions {
    gap: 14px;
  }

  .text-link {
    font-size: 0.84rem;
  }

  .acoustic-hero {
    min-height: 470px;
    border-radius: 25px;
  }

  .acoustic-stage {
    inset-block: 54px 110px;
  }

  .icon-orbit {
    width: 142px;
    border-radius: 31px;
  }

  .icon-orbit img {
    border-radius: 24px;
  }

  .ring-one { width: 176px; height: 176px; }
  .ring-two { width: 246px; height: 246px; }
  .ring-three { width: 326px; height: 326px; }
  .ring-four { width: 410px; height: 410px; }

  .frequency-readout {
    top: 22px;
    left: 22px;
  }

  .frequency-readout strong {
    font-size: 1.4rem;
  }

  .signal-panel {
    inset: auto 14px 14px;
  }

  .proof-track {
    width: min(calc(100% - 32px), var(--measure));
    min-height: 104px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 22px;
    white-space: normal;
  }

  .proof-track i {
    display: none;
  }

  .proof-track span {
    line-height: 1.35;
  }

  .section {
    padding-block: 82px;
  }

  .feature-primary {
    min-height: 0;
    border-radius: 24px;
  }

  .feature-primary-copy {
    padding: 32px 25px 36px;
  }

  .frequency-visual {
    min-height: 300px;
    padding-inline: 24px;
  }

  .feature-secondary,
  .feature-meter,
  .feature-meter + .feature-secondary,
  .feature-history,
  .feature-history + .feature-secondary {
    grid-column: span 12;
    min-height: 250px;
    padding: 26px;
  }

  .process-list li {
    grid-template-columns: 46px 1fr;
    gap: 12px;
  }

  .faq-list summary {
    min-height: 74px;
    font-size: 1rem;
  }

  .final-cta {
    padding-inline: 10px;
  }

  .final-cta-shell {
    min-height: 0;
    padding: 44px 24px;
    grid-template-columns: 1fr;
    gap: 25px;
    border-radius: 24px;
  }

  .final-cta-shell img {
    width: 72px;
    height: 72px;
  }

  .final-cta-shell .app-store-badge {
    grid-column: 1;
  }

  .cta-ripples {
    right: -35%;
  }

  .footer-shell {
    grid-template-columns: 1fr;
  }

  .footer-shell > p {
    grid-column: 1;
    grid-row: auto;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 380px) {
  .hero-facts {
    gap: 8px 0;
  }

  .hero-facts li {
    flex-basis: 50%;
  }

  .hero-facts li:nth-child(2)::after {
    display: none;
  }

  .hero-facts li:nth-child(4)::after {
    display: none;
  }

  .app-store-badge {
    width: 168px;
    height: 56px;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header {
    background: var(--surface);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .icon-orbit {
    background: var(--dark-panel-2);
    backdrop-filter: none;
  }
}

:root{--guide-accent:var(--anchor,var(--green,var(--canopy,var(--slate,#2f6fe4))));--guide-ink:var(--ink,var(--text,#17202a));--guide-muted:var(--muted,var(--ink-soft,#5e6b76));--guide-line:var(--line,rgba(20,35,45,.16));--guide-surface:var(--surface-raised,var(--paper-raised,var(--surface,var(--paper,#fff))));--guide-bg:var(--paper,var(--surface,#fff));--guide-tint:var(--anchor-soft,var(--canopy-soft,var(--slate-wash,rgba(50,110,220,.08))))}
/* Arc Tools SEO guide surfaces */
/* Additive, theme-aware resource surfaces used by generated guide hubs. */
.seo-guides{padding:clamp(3rem,7vw,6rem) 0;border-top:1px solid var(--guide-line)}
.seo-guides-inner,.guide-shell{width:min(100% - 2rem,64rem);margin:0 auto}
.seo-guides-kicker,.guide-kicker{margin:0 0 .55rem;color:var(--guide-accent);font-size:.78rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase}
.seo-guides h2,.guide-hero h1,.guide-article h2{color:var(--guide-ink);font-family:var(--display,var(--body,system-ui));line-height:1.08;letter-spacing:-.025em}
.seo-guides h2{max-width:30rem;margin:.2rem 0 .8rem;font-size:clamp(1.7rem,3vw,2.5rem)}
.seo-guides p,.guide-hero p,.guide-article p,.guide-article li{color:var(--guide-muted);line-height:1.7}
.seo-guides-intro{max-width:44rem;margin:0 0 1.4rem}
.seo-guides-links{display:flex;flex-wrap:wrap;gap:.65rem 1rem;margin:1.25rem 0}
.seo-guides-links a,.guide-nav a{color:var(--guide-accent);font-weight:700;text-decoration:underline;text-decoration-thickness:.08em;text-underline-offset:.16em}
.seo-guides-more{display:inline-flex;align-items:center;min-height:2.75rem;padding:.7rem 1rem;border:1px solid var(--guide-line);border-radius:999px;background:var(--guide-surface);color:var(--guide-ink)!important;text-decoration:none!important}
.guide-page{background:var(--guide-bg);color:var(--guide-ink)}
.guide-shell{padding-block:clamp(2rem,6vw,5rem)}
.guide-nav{display:flex;justify-content:space-between;gap:1rem;align-items:center;margin-bottom:clamp(2rem,5vw,4rem);font-size:.95rem}
.guide-nav a:first-child{font-weight:700;text-decoration:none}
.guide-hero{max-width:48rem;margin-bottom:clamp(2.5rem,6vw,5rem)}
.guide-hero h1{margin:.2rem 0 1rem;font-size:clamp(2.1rem,5vw,4.5rem)}
.guide-hero .guide-summary{max-width:42rem;font-size:clamp(1.08rem,1.5vw,1.28rem)}
.guide-index-list{display:grid;gap:1rem;margin:2rem 0 0;padding:0;list-style:none}
.guide-index-list li{margin:0}
.guide-index-link{display:block;padding:1.15rem 1.25rem;border:1px solid var(--guide-line);border-radius:1rem;background:var(--guide-surface);text-decoration:none;transition:transform .2s ease,border-color .2s ease}
.guide-index-link:hover,.guide-index-link:focus-visible{transform:translateY(-2px);border-color:var(--guide-accent)}
.guide-index-link strong{display:block;color:var(--guide-ink);font-size:1.08rem;margin-bottom:.3rem}
.guide-index-link span{color:var(--guide-muted)}
.guide-article{max-width:46rem}
.guide-article h2{margin:2.4rem 0 .75rem;font-size:clamp(1.35rem,2.5vw,2rem)}
.guide-article ul{padding-left:1.2rem}
.guide-article li+li{margin-top:.55rem}
.guide-callout{margin:2rem 0;padding:1.1rem 1.25rem;border-left:3px solid var(--guide-accent);background:var(--guide-tint);border-radius:0 .8rem .8rem 0}
.guide-callout p{margin:0}
.guide-footer-links{display:flex;flex-wrap:wrap;gap:1rem;margin-top:2.5rem;padding-top:1.25rem;border-top:1px solid var(--guide-line)}
@media (min-width:48rem){.seo-guides-inner,.guide-shell{width:min(100% - 4rem,64rem)}}
@media (prefers-reduced-motion:reduce){.guide-index-link{transition:none}.guide-index-link:hover{transform:none}}