/* コエイロ — warm paper, quiet ink, and the contour of a voice. */
:root {
  --paper: #f5f5ee;
  --white: #fcfcf7;
  --ink: #183b35;
  --muted: #53685f;
  --line: #cfd9cc;
  --accent: #236e5c;
  --sage: #e8eee4;
  --orange: #a95133;
  --night: #102b29;
  --mint: #72e0c0;
  --gutter: clamp(24px, 4.2vw, 64px);
  --body:
    -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic",
    Meiryo, sans-serif;
  --display: "Hiragino Maru Gothic ProN", var(--body);
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.9 var(--body);
  -webkit-font-smoothing: antialiased;
}
h1,
h2,
h3,
p,
figure {
  margin: 0;
}
a {
  color: inherit;
  text-underline-offset: 5px;
}
button,
input {
  font: inherit;
}
button,
a,
input,
summary {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
}
button:disabled,
input:disabled {
  cursor: default;
}
img,
svg {
  display: block;
  max-width: 100%;
}
img {
  height: auto;
}
::selection {
  background: #c1e5d5;
  color: var(--ink);
}
:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 6px;
  border-radius: 3px;
}
h1,
h2,
h3 {
  font-feature-settings: "palt";
  line-height: 1.5;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
h2 {
  font-size: clamp(30px, 3.6vw, 48px);
  font-weight: 600;
  letter-spacing: 0.035em;
}
h3 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.015em;
}
.container {
  width: min(100%, 1328px);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section {
  padding-block: 112px;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  font-weight: 500;
  line-height: 1.8;
  margin-bottom: 25px;
  color: var(--accent);
}
.small-dot,
.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}
.small-dot {
  margin-right: 8px;
  vertical-align: 1px;
}
.status-dot {
  background: var(--orange);
}
.index {
  font: 11px var(--mono);
  letter-spacing: 0.1em;
  color: var(--accent);
}
.mono {
  font-family: var(--mono);
}
.skip-link {
  position: absolute;
  top: -100px;
  left: 24px;
  padding: 12px 20px;
  background: var(--ink);
  color: white;
  z-index: 50;
}
.skip-link:focus {
  top: 12px;
}
.mobile-break {
  display: none;
}
/* Navigation */
.site-header {
  position: relative;
  z-index: 5;
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 28px;
  min-height: 100px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
  text-decoration: none;
}
.brand img {
  width: 36px;
  border-radius: 10px;
}
.brand span {
  font-family: var(--display);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.site-nav {
  display: flex;
  gap: 32px;
  margin-left: auto;
  margin-right: 34px;
}
.site-nav a,
.header-link {
  font-size: 13px;
  text-decoration: none;
}
.site-nav a {
  color: var(--muted);
}
.site-nav a:hover {
  color: var(--ink);
}
.header-link {
  display: flex;
  align-items: center;
  gap: 22px;
  font-weight: 600;
  border-bottom: 1px solid var(--ink);
  padding-block: 8px;
}
.header-link span {
  font-size: 20px;
}
/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.08fr 1fr;
  align-items: center;
  min-height: 778px;
  gap: 30px;
  padding-block: 38px 58px;
}
.hero-copy {
  min-width: 0;
  container-type: inline-size;
  padding-block: 30px;
  z-index: 1;
}
.hero .eyebrow {
  letter-spacing: 0.07em;
  font-family: var(--body);
  font-size: 12px;
  margin-bottom: 29px;
}
.hero h1 {
  font-size: clamp(48px, 5.2vw, 74px);
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.52;
  margin-left: -0.05em;
  white-space: nowrap;
}
.hero h1 > span {
  display: block;
}
.hero-last {
  position: relative;
  width: max-content;
}
.title-mark {
  position: absolute;
  right: 2px;
  bottom: -1px;
  width: 110px;
  stroke: var(--accent);
  stroke-width: 1.4;
  fill: none;
}
.hero-lede {
  font-size: 16px;
  line-height: 2.2;
  color: var(--muted);
  margin-top: 29px;
}
.hero-summary {
  font-size: 16px;
  margin-top: 13px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-top: 31px;
  flex-wrap: wrap;
}
.button {
  display: inline-flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  text-decoration: none;
  padding: 18px 25px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 5px;
  border: 1px solid var(--ink);
  transition:
    background 0.2s,
    transform 0.2s;
}
.button-dark {
  background: var(--ink);
  color: var(--white);
}
.button-dark:hover {
  background: #285449;
  transform: translateY(-2px);
}
.button span {
  font-size: 21px;
  line-height: 1;
}
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 25px;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-block: 4px;
  font-size: 13px;
  font-weight: 500;
}
.text-link span {
  font-size: 20px;
  line-height: 1;
}
.text-link:hover {
  color: var(--accent);
}
.availability {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  font-size: 10px;
  color: var(--muted);
  margin-top: 21px;
}
.availability .status-dot {
  width: 5px;
  height: 5px;
}
.availability-divider {
  margin-inline: 3px;
}
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 660px;
  isolation: isolate;
}
.voice-lines {
  position: absolute;
  width: calc(100% + 60px);
  max-width: none;
  height: 100%;
  z-index: -1;
  object-fit: contain;
  opacity: 0.95;
}
.phone {
  width: 272px;
  padding: 7px;
  background: #1a2826;
  border: 1px solid #52635d;
  border-radius: 39px;
  box-shadow:
    0 20px 35px -20px #193a3659,
    5px 7px 0 -1px #dae0d5;
  transform: rotate(5deg);
  overflow: hidden;
}
.phone img {
  width: 100%;
  border-radius: 31px;
}
.visual-note {
  position: absolute;
  font: 9px var(--mono);
  letter-spacing: 0.13em;
  color: var(--muted);
}
.visual-note-top {
  right: -8px;
  top: 36px;
  writing-mode: vertical-rl;
}
.visual-caption {
  position: absolute;
  bottom: 14px;
  left: 1px;
  font-size: 10px;
  line-height: 1.9;
  letter-spacing: 0.04em;
}
.visual-caption > span:last-child {
  color: var(--muted);
  font-size: 9px;
}
.caption-rule {
  display: block;
  width: 34px;
  height: 1px;
  background: var(--accent);
  margin-bottom: 7px;
}
.visual-index {
  position: absolute;
  bottom: 23px;
  right: 0;
  font: 9px var(--mono);
  letter-spacing: 0.08em;
  writing-mode: vertical-rl;
  color: var(--muted);
}
.principles {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding-top: 27px;
  padding-bottom: 27px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.principles p {
  font-size: 12px;
  letter-spacing: 0.025em;
}
.principles span {
  font: 10px var(--mono);
  color: var(--accent);
  margin-right: 18px;
}
/* Story */
.intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 110px;
  padding-block: 136px;
}
.intro-body {
  padding-top: 36px;
  color: var(--muted);
  font-size: 15px;
  line-height: 2.15;
}
.intro-body p + p {
  margin-top: 23px;
}
.intro-body p:first-child {
  font-size: 20px;
  line-height: 1.95;
  color: var(--ink);
  margin-bottom: 30px;
}
.intro-body .text-link {
  margin-top: 25px;
  color: var(--ink);
}
.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 35px;
  margin-bottom: 56px;
}
.section-heading > p {
  font-size: 13px;
  color: var(--muted);
  line-height: 2.1;
  padding-bottom: 6px;
}
.section-heading .eyebrow {
  margin-bottom: 19px;
}
/* The interactive instrument */
.instrument-section {
  background: var(--sage);
}
.instrument-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(55px, 7.5vw, 115px);
  align-items: center;
}
.demo {
  background: var(--night);
  border-radius: 16px;
  padding: 28px;
  color: #f2f7f0;
  box-shadow: 0 26px 45px -25px #183b3540;
  min-width: 0;
}
.demo-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 23px;
  border-bottom: 1px solid #37504b;
}
.demo-logo {
  font-size: 17px;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.demo-badge {
  font-size: 10px;
  color: #c3d6c9;
  border: 1px solid #47615a;
  border-radius: 3px;
  padding: 2px 8px;
}
.demo-reference {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  font-size: 12px;
  color: #bad0c3;
}
.demo-reference .mono {
  color: var(--mint);
  font-size: 21px;
}
.demo-reference small {
  font-size: 10px;
  color: #bad0c3;
  margin-left: 11px;
}
.demo-resonance,
.demo-pitch {
  padding: 20px;
  background: #1c3935;
  border-radius: 7px;
}
.demo-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: #c2d6c8;
}
.metric-number {
  font: 10px var(--mono);
  color: #a1beb3;
}
.resonance-reading {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-block: 14px 20px;
  color: var(--mint);
}
.resonance-track {
  position: relative;
  height: 5px;
  background: #426056;
  border-radius: 8px;
  margin-block: 18px;
}
.resonance-center {
  position: absolute;
  height: 15px;
  width: 1px;
  background: #b1cdc1;
  top: -5px;
  left: 50%;
}
.resonance-dot {
  position: absolute;
  width: 13px;
  height: 13px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: var(--mint);
  transition: left 0.2s;
}
.demo-scale {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: #bfd1c5;
}
.demo-hint {
  font-size: 10px;
  color: #abc3b5;
  margin-top: 15px;
}
.demo-pitch {
  margin-top: 11px;
}
.pitch-reading {
  display: flex;
  align-items: baseline;
  gap: 7px;
  margin: 8px 0 5px;
  color: var(--mint);
}
.pitch-reading output {
  font: 36px var(--mono);
  font-weight: 400;
}
.pitch-reading > span {
  font-size: 11px;
}
.pitch-track {
  height: 25px;
  margin-block: 15px 9px;
  position: relative;
  background: repeating-linear-gradient(
    90deg,
    #4d6960 0 1px,
    transparent 1px 10%
  );
  background-size: 100% 9px;
  background-position: center;
  background-repeat: no-repeat;
}
.pitch-center {
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 25px;
  background: #a3beb0;
}
.pitch-needle {
  position: absolute;
  left: 50%;
  height: 25px;
  top: 0;
  width: 3px;
  background: var(--mint);
  transform: translateX(-50%);
}
.demo-level {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 10px;
  color: #bdd4c7;
  padding-block: 20px;
}
.demo-level > span {
  white-space: nowrap;
}
.level-track {
  height: 5px;
  background: #365247;
  border-radius: 10px;
  flex: 1;
  min-width: 15px;
}
.level-track > span {
  display: block;
  width: 63%;
  height: 100%;
  background: var(--mint);
  border-radius: 10px;
}
.demo-level > .metric-number {
  margin-left: auto;
}
.demo-controls {
  border-top: 1px solid #37504b;
  padding-top: 21px;
}
.demo-controls label {
  font-size: 12px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}
.demo-controls label > span {
  font-size: 10px;
  color: #abc3b5;
}
.demo-controls input[type="range"] {
  display: block;
  accent-color: var(--mint);
  width: 100%;
  height: 38px;
  margin: 8px 0 14px;
  cursor: ew-resize;
}
.demo-controls fieldset {
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}
.demo-controls legend {
  font-size: 12px;
  margin-bottom: 12px;
}
.segment-control {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid #648072;
  border-radius: 5px;
  overflow: hidden;
  gap: 1px;
  background: #648072;
}
.segment-control button {
  border: 0;
  background: var(--night);
  padding: 11px 4px;
  color: #d3e2d7;
  font-size: 12px;
  min-height: 44px;
}
.segment-control button[aria-pressed="true"] {
  color: var(--night);
  background: #bedac8;
  font-weight: 600;
}
.segment-control button:hover:not([aria-pressed="true"]) {
  background: #2f4c42;
}
.segment-control button:focus-visible {
  outline-offset: -4px;
  outline-color: var(--mint);
}
.demo-caption {
  margin-top: 20px;
  color: #aec7b8;
  font-size: 10px;
  line-height: 1.9;
}
.metric-explanation {
  border-bottom: 1px solid #c1cfbe;
  padding-block: 30px;
}
.metric-explanation:first-child {
  padding-top: 0;
}
.metric-explanation:last-child {
  border: 0;
  padding-bottom: 0;
}
.metric-explanation h3 {
  margin: 14px 0 13px;
}
.metric-explanation > p {
  font-size: 14px;
  color: var(--muted);
  line-height: 2.05;
}
.metric-explanation .annotation {
  font-size: 11px;
  line-height: 1.9;
  margin-top: 12px;
  color: #4e675d;
}
/* Practice */
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 43px;
}
.steps li {
  position: relative;
  border-top: 1px solid var(--line);
  padding-top: 19px;
}
.step-number {
  font: 11px var(--mono);
  color: var(--accent);
}
.step-art {
  height: 135px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-block: 5px 18px;
  color: var(--accent);
}
.pitch-art {
  gap: 12px;
  font: 22px var(--mono);
  color: #526f5c;
}
.selected-note {
  font-size: 32px;
  color: var(--ink);
  background: #e6ecde;
  border-radius: 50%;
  height: 88px;
  width: 88px;
  display: grid;
  place-items: center;
  border: 1px solid #cad6c1;
}
.vowel-art {
  position: relative;
  gap: 8px;
  font-size: 42px;
}
.vowel-ring {
  position: absolute;
  left: calc(50% - 70px);
  top: 15px;
  width: 105px;
  height: 105px;
  border: 1px solid #b5cbb6;
  border-radius: 50%;
}
.vowel-ring::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid #c7d7be;
  border-radius: 50%;
}
.vowel-lines {
  font-weight: 300;
  font-size: 38px;
  transform: scaleX(1.5);
}
.compare-art {
  gap: 7px;
}
.compare-art i {
  display: block;
  width: 5px;
  height: 22px;
  background: #77a78b;
  border-radius: 4px;
}
.compare-art i:nth-child(2n) {
  height: 46px;
}
.compare-art i:nth-child(3n) {
  height: 75px;
}
.compare-art i:nth-child(4n) {
  height: 59px;
}
.compare-art i:nth-child(6) {
  height: 102px;
  background: var(--accent);
}
.steps h3 {
  font-size: 18px;
  margin-bottom: 16px;
}
.steps p {
  font-size: 13px;
  color: var(--muted);
  line-height: 2.1;
}
.care-note {
  display: flex;
  align-items: baseline;
  gap: 15px;
  font-size: 12px;
  margin-top: 40px;
  color: var(--muted);
  padding-top: 22px;
  border-top: 1px solid var(--line);
}
.care-note > span {
  color: var(--orange);
  font-size: 19px;
}
/* Privacy */
.privacy-section {
  background: var(--ink);
  color: #f0f3e7;
}
.privacy-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  align-items: center;
  gap: 100px;
  padding-block: 86px;
}
.privacy-art {
  display: flex;
  justify-content: center;
}
.privacy-art svg {
  width: 260px;
  stroke: #80a58b;
  stroke-width: 1;
  fill: none;
}
.privacy-art svg circle:nth-child(1) {
  stroke: #395b48;
}
.privacy-art svg circle:nth-child(2) {
  stroke: #52765c;
}
.privacy-art svg rect,
.privacy-art svg path {
  stroke: #cfdfbd;
  stroke-width: 2;
}
.privacy-section .eyebrow {
  color: #bcd6ab;
  font-size: 10px;
}
.privacy-section h2 {
  font-size: clamp(28px, 3vw, 39px);
  line-height: 1.65;
}
.privacy-section p:not(.eyebrow) {
  font-size: 14px;
  color: #c4d5bd;
  line-height: 2.15;
  margin-top: 25px;
}
.privacy-section .text-link {
  margin-top: 23px;
  color: #e4f0d4;
}
.privacy-section .text-link:hover {
  color: white;
}
/* Questions + close */
.faq-section {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 100px;
}
.faq-section h2 {
  font-size: 36px;
}
.faq-lede {
  font-size: 13px;
  color: var(--muted);
  margin-block: 20px 26px;
}
.faq-list {
  border-top: 1px solid var(--line);
}
.faq-list details {
  border-bottom: 1px solid var(--line);
}
.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding-block: 25px;
  list-style: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.85;
}
.faq-list summary::-webkit-details-marker {
  display: none;
}
.faq-icon {
  position: relative;
  display: block;
  flex: 0 0 12px;
  width: 12px;
  height: 12px;
}
.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: var(--accent);
  top: 5px;
  left: 0;
  height: 1px;
  width: 12px;
}
.faq-icon::after {
  transform: rotate(90deg);
  transition: transform 0.2s;
}
.faq-list details[open] .faq-icon::after {
  transform: rotate(0);
}
.faq-answer {
  padding: 0 24px 25px 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 2.05;
}
.closing {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 50px;
  border-top: 1px solid var(--line);
  padding-block: 70px 85px;
}
.closing h2 {
  font-size: clamp(34px, 4.1vw, 54px);
  line-height: 1.6;
}
.closing-action > p {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.closing-action > p > span {
  font: 11px var(--mono);
  color: var(--muted);
  margin-left: 12px;
}
.release-label {
  display: flex;
  gap: 12px;
  align-items: center;
  border: 1px solid #a8bba5;
  border-radius: 5px;
  padding: 16px 24px;
  font-size: 13px;
  margin-top: 22px;
}
.closing-action .text-link {
  font-size: 12px;
  margin-top: 20px;
}
.site-footer {
  padding-block: 30px 28px;
  border-top: 1px solid var(--line);
}
.footer-top,
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 25px;
}
.footer-top .brand img {
  width: 28px;
  border-radius: 7px;
}
.footer-top .brand span {
  font-size: 19px;
}
.footer-top nav {
  display: flex;
  gap: 30px;
  font-size: 11px;
  color: var(--muted);
}
.footer-top nav a {
  text-decoration: none;
}
.footer-top nav a:hover {
  text-decoration: underline;
}
.footer-bottom {
  margin-top: 28px;
  align-items: baseline;
  font-size: 10px;
  color: var(--muted);
}
.footer-bottom > span {
  white-space: nowrap;
  font-family: var(--mono);
}
/* Support and privacy share the same typography and navigation. */
.document-main {
  max-width: 940px;
  padding-block: 75px 100px;
}
.document-main h1 {
  font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 20px;
}
.document-main .lede {
  color: var(--muted);
  font-size: 15px;
}
.updated {
  font: 11px var(--mono);
  color: var(--muted);
}
.callout {
  background: var(--sage);
  border-left: 2px solid var(--accent);
  padding: 25px 30px;
  margin-block: 35px;
}
.callout p {
  font-size: 14px;
}
.contact-mail {
  font: 18px var(--mono);
  color: var(--accent);
  overflow-wrap: anywhere;
  display: inline-block;
  margin-block: 10px;
}
.callout .callout-note {
  font-size: 12px;
  color: var(--muted);
  margin-top: 10px;
}
.prose {
  font-size: 15px;
  color: var(--muted);
  line-height: 2.05;
}
.prose h2 {
  font-size: 23px;
  color: var(--ink);
  margin: 45px 0 18px;
  letter-spacing: 0.02em;
}
.prose h3 {
  font-size: 17px;
  color: var(--ink);
  margin: 28px 0 12px;
}
.prose p + p {
  margin-top: 15px;
}
.prose strong {
  font-weight: 600;
  color: var(--ink);
}
.prose a {
  color: var(--accent);
}
.prose li {
  margin-block: 7px;
}
.prose ul {
  padding-left: 22px;
}
.document-rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin-block: 40px;
}
.document-header .site-nav {
  margin-right: 0;
}
.document-footer .footer-bottom {
  margin-top: 20px;
}
.document-back {
  margin-bottom: 35px;
}
.not-found {
  min-height: 60vh;
}
.not-found .button {
  margin-top: 25px;
}
@media (min-width: 1500px) {
  .hero {
    min-height: 810px;
  }
  .hero-visual {
    min-height: 680px;
  }
  .phone {
    width: 292px;
  }
}
@media (max-width: 1100px) {
  .site-nav {
    gap: 22px;
    margin-right: 8px;
  }
  .header-inner {
    gap: 24px;
  }
  .hero {
    gap: 10px;
    min-height: 715px;
  }
  .hero h1 {
    font-size: clamp(42px, 5.15vw, 60px);
  }
  .hero-visual {
    min-height: 600px;
  }
  .phone {
    width: 242px;
    border-radius: 35px;
  }
  .phone img {
    border-radius: 28px;
  }
  .hero-actions {
    gap: 21px;
  }
  .button {
    padding: 16px 20px;
    gap: 20px;
  }
  .hero-actions .text-link {
    font-size: 12px;
  }
  .intro {
    gap: 70px;
  }
  .instrument-layout {
    gap: 55px;
  }
  .demo {
    padding: 23px;
  }
  .privacy-layout,
  .faq-section {
    gap: 60px;
  }
  .steps {
    gap: 28px;
  }
  .steps h3 {
    font-size: 16px;
  }
  .voice-lines {
    width: calc(100% + 30px);
  }
}
@media (max-width: 860px) {
  .site-nav {
    display: none;
  }
  .document-header .site-nav {
    display: flex;
  }
  .header-inner {
    min-height: 84px;
  }
  .hero {
    grid-template-columns: 1fr 1fr;
    min-height: 630px;
  }
  .hero h1 {
    font-size: 40px;
  }
  .hero .eyebrow {
    font-size: 10px;
  }
  .hero-lede,
  .hero-summary {
    font-size: 13px;
  }
  .hero-actions {
    gap: 18px;
    margin-top: 24px;
  }
  .hero-actions .text-link {
    font-size: 11px;
  }
  .availability {
    font-size: 9px;
    max-width: 260px;
  }
  .hero-visual {
    min-height: 510px;
  }
  .phone {
    width: 207px;
    border-radius: 31px;
    padding: 6px;
  }
  .phone img {
    border-radius: 25px;
  }
  .visual-note-top {
    right: 0;
    font-size: 8px;
  }
  .visual-caption {
    font-size: 9px;
    bottom: 0;
  }
  .visual-caption > span:last-child {
    font-size: 8px;
  }
  .visual-index {
    display: none;
  }
  .principles {
    gap: 12px;
  }
  .principles p {
    font-size: 10px;
  }
  .principles span {
    margin-right: 8px;
  }
  .section {
    padding-block: 85px;
  }
  .intro {
    gap: 50px;
  }
  .intro h2 {
    font-size: 35px;
  }
  .intro-body {
    padding-top: 22px;
    font-size: 13px;
  }
  .intro-body p:first-child {
    font-size: 17px;
  }
  .section-heading {
    align-items: flex-start;
    margin-bottom: 40px;
  }
  .section-heading > p {
    font-size: 12px;
  }
  .instrument-layout {
    gap: 35px;
  }
  .demo {
    padding: 19px;
  }
  .resonance-reading {
    font-size: 19px;
  }
  .demo-resonance,
  .demo-pitch {
    padding: 16px;
  }
  .metric-explanation h3 {
    font-size: 18px;
  }
  .metric-explanation > p {
    font-size: 12px;
  }
  .metric-explanation .annotation {
    font-size: 10px;
  }
  .steps {
    gap: 23px;
  }
  .step-art {
    height: 115px;
  }
  .steps p {
    font-size: 12px;
  }
  .steps h3 {
    font-size: 15px;
  }
  .privacy-layout,
  .faq-section {
    gap: 40px;
  }
  .privacy-layout {
    padding-block: 70px;
  }
  .privacy-art svg {
    width: 220px;
  }
  .privacy-section h2 {
    font-size: 27px;
  }
  .privacy-section p:not(.eyebrow) {
    font-size: 12px;
  }
  .faq-section h2 {
    font-size: 30px;
  }
  .faq-list summary {
    font-size: 13px;
  }
  .closing {
    padding-block: 60px;
  }
  .footer-top nav {
    gap: 18px;
  }
}
@media (max-width: 680px) {
  html {
    scroll-padding-top: 24px;
  }
  .header-inner {
    min-height: 78px;
  }
  .brand {
    gap: 9px;
  }
  .brand img {
    width: 31px;
    border-radius: 8px;
  }
  .brand span {
    font-size: 22px;
  }
  .header-link {
    font-size: 11px;
    gap: 18px;
    padding-block: 6px;
  }
  .hero {
    grid-template-columns: 1fr;
    gap: 0;
    padding-top: 43px;
    padding-bottom: 38px;
  }
  .hero-copy {
    padding: 0;
  }
  .hero .eyebrow {
    font-size: 11px;
    margin-bottom: 20px;
  }
  .hero h1 {
    font-size: clamp(35px, 12.6cqi, 65px);
    line-height: 1.48;
    letter-spacing: -0.04em;
  }
  .title-mark {
    width: 84px;
    bottom: -4px;
  }
  .hero-lede {
    font-size: 14px;
    line-height: 2.05;
    margin-top: 26px;
  }
  .hero-summary {
    font-size: 14px;
    margin-top: 11px;
  }
  .hero-actions {
    margin-top: 26px;
    gap: 25px;
  }
  .button {
    padding: 16px 19px;
    font-size: 12px;
    gap: 20px;
  }
  .hero-actions .text-link {
    font-size: 11px;
    gap: 12px;
  }
  .availability {
    font-size: 9px;
    max-width: none;
    gap: 6px;
    margin-top: 19px;
  }
  .hero-visual {
    min-height: 590px;
    margin-top: 19px;
  }
  .phone {
    width: 232px;
    border-radius: 35px;
    padding: 6px;
  }
  .phone img {
    border-radius: 29px;
  }
  .voice-lines {
    max-width: 520px;
    width: calc(100% + 28px);
  }
  .visual-note-top {
    top: 60px;
    right: 0;
  }
  .visual-caption {
    bottom: 0;
    left: 0;
    font-size: 9px;
  }
  .visual-index {
    display: block;
    right: 0;
    bottom: 22px;
    font-size: 8px;
  }
  .principles {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    padding-block: 22px;
  }
  .principles p {
    font-size: 12px;
  }
  .principles span {
    margin-right: 22px;
  }
  .section {
    padding-block: 68px;
  }
  .intro {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .intro h2 {
    font-size: 36px;
    line-height: 1.6;
  }
  .wide-break {
    display: initial;
  }
  .intro .eyebrow {
    margin-bottom: 20px;
  }
  .intro-body {
    padding-top: 0;
    font-size: 14px;
    line-height: 2.15;
  }
  .intro-body p:first-child {
    font-size: 18px;
    margin-bottom: 22px;
  }
  .intro-body p + p {
    margin-top: 20px;
  }
  .intro-body .text-link {
    margin-top: 24px;
  }
  .section-heading {
    display: block;
    margin-bottom: 33px;
  }
  .section-heading h2 {
    font-size: 32px;
    line-height: 1.65;
  }
  .section-heading > p {
    font-size: 12px;
    margin-top: 20px;
  }
  .section-heading .eyebrow {
    font-size: 10px;
    margin-bottom: 17px;
  }
  .instrument-layout {
    grid-template-columns: 1fr;
    gap: 44px;
  }
  .demo {
    padding: 23px;
    max-width: 440px;
    width: 100%;
    justify-self: center;
  }
  .demo-top {
    padding-bottom: 18px;
  }
  .resonance-reading {
    font-size: 23px;
  }
  .demo-resonance,
  .demo-pitch {
    padding: 20px;
  }
  .demo-reference {
    padding-block: 16px;
  }
  .demo-label {
    font-size: 12px;
  }
  .metric-explanation {
    padding-block: 27px;
  }
  .metric-explanation h3 {
    font-size: 20px;
    margin-top: 12px;
  }
  .metric-explanation > p {
    font-size: 14px;
  }
  .metric-explanation .annotation {
    font-size: 11px;
  }
  .steps {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .steps li {
    display: grid;
    grid-template-columns: 42px 1fr;
    column-gap: 4px;
    padding-top: 20px;
  }
  .step-number {
    grid-column: 1;
    grid-row: 1;
    padding-top: 12px;
  }
  .step-art {
    grid-column: 2;
    height: 107px;
    justify-content: flex-start;
    margin-block: 0 16px;
  }
  .steps h3 {
    grid-column: 2;
    font-size: 18px;
    margin-bottom: 12px;
  }
  .steps p {
    grid-column: 2;
    font-size: 13px;
  }
  .pitch-art {
    padding-left: 8px;
  }
  .selected-note {
    height: 77px;
    width: 77px;
    font-size: 29px;
  }
  .vowel-art {
    padding-left: 33px;
  }
  .vowel-ring {
    left: 10px;
    top: 5px;
    width: 90px;
    height: 90px;
  }
  .compare-art {
    padding-left: 16px;
    gap: 8px;
  }
  .care-note {
    font-size: 11px;
    margin-top: 32px;
    padding-top: 20px;
    gap: 10px;
  }
  .privacy-layout {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-block: 58px;
  }
  .privacy-art {
    justify-content: flex-start;
  }
  .privacy-art svg {
    width: 165px;
    margin-left: -8px;
  }
  .privacy-section h2 {
    font-size: 29px;
    line-height: 1.65;
  }
  .privacy-section .eyebrow {
    margin-bottom: 20px;
    font-size: 9px;
  }
  .privacy-section p:not(.eyebrow) {
    font-size: 13px;
  }
  .privacy-section .text-link {
    font-size: 12px;
  }
  .faq-section {
    grid-template-columns: 1fr;
    gap: 35px;
  }
  .faq-section .eyebrow {
    font-size: 10px;
    margin-bottom: 20px;
  }
  .faq-lede {
    margin-top: 15px;
    margin-bottom: 17px;
  }
  .faq-section h2 {
    font-size: 32px;
  }
  .faq-list summary {
    font-size: 13px;
    padding-block: 22px;
  }
  .faq-answer {
    font-size: 12px;
  }
  .closing {
    display: block;
    padding-block: 48px 60px;
  }
  .closing .eyebrow {
    font-size: 8px;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
  }
  .closing h2 {
    font-size: 38px;
  }
  .closing-action {
    margin-top: 35px;
  }
  .closing-action > p {
    font-size: 21px;
  }
  .release-label {
    width: max-content;
    margin-top: 17px;
    font-size: 12px;
    padding: 14px 22px;
  }
  .closing-action .text-link {
    font-size: 11px;
    margin-top: 18px;
  }
  .site-footer {
    padding-top: 25px;
  }
  .footer-top,
  .footer-bottom {
    display: block;
  }
  .footer-top nav {
    margin-top: 25px;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 10px;
  }
  .footer-bottom {
    font-size: 9px;
    margin-top: 25px;
    line-height: 1.9;
  }
  .footer-bottom > span {
    display: block;
    margin-top: 16px;
  }
  .document-header .site-nav {
    gap: 20px;
  }
  .document-header .site-nav a {
    font-size: 11px;
  }
  .document-main {
    padding-block: 45px 65px;
  }
  .document-main h1 {
    font-size: 29px;
  }
  .document-main .eyebrow {
    font-size: 10px;
  }
  .document-main .lede {
    font-size: 13px;
  }
  .callout {
    padding: 20px;
    margin-block: 26px;
  }
  .callout p,
  .prose {
    font-size: 13px;
  }
  .contact-mail {
    font-size: 16px;
  }
  .prose h2 {
    font-size: 20px;
  }
  .prose h3 {
    font-size: 16px;
  }
}
@media (max-width: 360px) {
  .hero-actions {
    gap: 16px;
  }
  .button {
    font-size: 11px;
    gap: 15px;
    padding-inline: 15px;
  }
  .hero-actions .text-link {
    font-size: 10px;
    gap: 8px;
  }
  .hero-lede,
  .hero-summary {
    font-size: 13px;
  }
  .availability {
    font-size: 8px;
  }
  .hero-visual {
    min-height: 560px;
  }
  .phone {
    width: 215px;
  }
  .demo {
    padding: 17px;
  }
  .demo-resonance,
  .demo-pitch {
    padding: 16px;
  }
  .resonance-reading {
    font-size: 21px;
  }
  .demo-level {
    gap: 8px;
    font-size: 9px;
  }
  .demo-controls label > span {
    font-size: 9px;
  }
  .privacy-section h2 {
    font-size: 26px;
  }
  .closing h2 {
    font-size: 33px;
  }
  .section-heading h2 {
    font-size: 29px;
  }
  .intro h2 {
    font-size: 32px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* Privacy policy: a concise app summary followed by navigable details. */
.policy-updated {
  margin-top: 24px;
}
.privacy-promise {
  background: var(--sage);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 32px;
  margin-block: 36px;
}
.privacy-promise .eyebrow {
  margin-bottom: 12px;
}
.privacy-promise h2 {
  font-size: 26px;
  line-height: 1.65;
  letter-spacing: 0.02em;
}
.privacy-promise > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 14px;
  line-height: 2;
  margin-top: 14px;
}
.privacy-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 26px 0 0;
  padding-top: 24px;
  border-top: 1px solid #bdcdb8;
  gap: 24px;
}
.privacy-facts dt {
  font-size: 12px;
  color: var(--muted);
}
.privacy-facts dd {
  font-size: 23px;
  font-weight: 600;
  margin: 6px 0 0;
}
.policy-contents {
  border-block: 1px solid var(--line);
  padding-block: 24px;
  margin-bottom: 16px;
}
.policy-contents h2 {
  font-size: 15px;
  letter-spacing: 0.02em;
}
.policy-contents ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 5px 38px;
  margin: 18px 0 0;
  padding-left: 24px;
}
.policy-contents li {
  font-size: 12px;
  color: var(--muted);
  padding-left: 2px;
}
.policy-contents a {
  display: inline-block;
  padding-block: 5px;
  text-decoration-color: var(--line);
}
.policy-contents a:hover {
  color: var(--ink);
  text-decoration-color: currentColor;
}
.policy-number {
  display: block;
  font: 11px var(--mono);
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}
.policy-prose section {
  padding-block: 24px 12px;
}
.policy-prose h2 {
  margin-top: 14px;
  scroll-margin-top: 30px;
}
.policy-source-links {
  margin-top: 20px;
  font-size: 13px;
}
.policy-contact {
  display: flex;
  flex-direction: column;
  font-style: normal;
  padding: 20px 24px;
  background: var(--sage);
  margin-block: 20px;
  border-radius: 5px;
}
.policy-contact > span {
  font-size: 13px;
  color: var(--ink);
}
.policy-contact .contact-mail {
  width: fit-content;
  margin-block: 8px 0;
}
.policy-back {
  border-top: 1px solid var(--line);
  margin-top: 36px;
  padding-top: 25px;
}
@media (max-width: 680px) {
  .privacy-document h1 {
    font-size: clamp(24px, 5.8vw, 29px);
  }
  .privacy-promise {
    padding: 22px;
    margin-block: 28px;
  }
  .privacy-promise h2 {
    font-size: 22px;
  }
  .privacy-promise > p:not(.eyebrow) {
    font-size: 13px;
  }
  .privacy-facts {
    grid-template-columns: 1fr;
    gap: 12px;
    padding-top: 18px;
    margin-top: 22px;
  }
  .privacy-facts > div {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 18px;
  }
  .privacy-facts dd {
    font-size: 19px;
    margin: 0;
  }
  .policy-contents ol {
    grid-template-columns: 1fr;
    gap: 5px;
  }
  .policy-prose section {
    padding-block: 20px 8px;
  }
  .policy-prose h2 {
    font-size: 20px;
  }
  .policy-source-links {
    font-size: 12px;
  }
  .policy-contact {
    padding: 18px 20px;
  }
}