:root {
  --ink: #263f43;
  --night: #1c3638;
  --forest: #294d49;
  --field: #a66f49;
  --clay: #c18b63;
  --gold: #dfbf7d;
  --gold-dark: #815d2d;
  --ivory: #f2eee4;
  --paper: #fffdf8;
  --mist: #e5ece8;
  --line: rgba(38, 63, 67, 0.16);
  --muted: #607276;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Arial, "Helvetica Neue", sans-serif;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.62;
}
a {
  color: inherit;
  text-decoration: none;
}
h1,
h2,
h3,
p {
  margin-top: 0;
}
h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.08;
}
h2 {
  font-size: clamp(34px, 3.5vw, 56px);
  letter-spacing: -0.03em;
}
.site-header {
  position: absolute;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  height: 82px;
  padding: 0 max(5vw, 24px);
  display: flex;
  align-items: center;
  gap: 38px;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--serif);
  font-size: 24px;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  font-size: 19px;
}
.site-header nav {
  display: flex;
  gap: 25px;
  margin-left: auto;
  font-size: 13px;
}
.site-header nav a,
.header-link {
  opacity: 0.84;
}
.site-header nav a:hover,
.header-link:hover {
  opacity: 1;
}
.header-link {
  font-size: 13px;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.55);
}
.hero {
  position: relative;
  min-height: 790px;
  height: 100svh;
  overflow: hidden;
  display: flex;
  align-items: center;
  color: #fff;
  background:
    radial-gradient(
      circle at 75% 45%,
      rgba(223, 191, 125, 0.22),
      transparent 26%
    ),
    linear-gradient(118deg, #172d31 0%, #244c49 54%, #956345 100%);
}
.hero:after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(12, 28, 31, 0.38), transparent 66%);
}
.hero-glow {
  position: absolute;
  width: 620px;
  height: 620px;
  right: -130px;
  top: 12%;
  border-radius: 50%;
  border: 90px solid rgba(212, 150, 102, 0.32);
  filter: blur(0.2px);
}
.hero-content {
  position: relative;
  z-index: 3;
  width: min(820px, 74vw);
  margin-left: max(7vw, 28px);
  transform: translateY(-6px);
}
.eyebrow {
  margin-bottom: 18px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-dark);
}
.eyebrow.light {
  color: #f0d69f;
}
.hero h1 {
  margin-bottom: 22px;
  font-size: clamp(56px, 6.3vw, 98px);
  letter-spacing: -0.05em;
}
.hero-lead {
  max-width: 700px;
  font-family: var(--serif);
  font-size: clamp(19px, 1.7vw, 25px);
  line-height: 1.42;
  color: rgba(255, 255, 255, 0.91);
}
.hero-formula {
  max-width: 720px;
  margin: 25px 0 0;
  padding-left: 20px;
  border-left: 1px solid var(--gold);
  font-size: 16px;
  color: rgba(255, 255, 255, 0.77);
}
.actions {
  display: flex;
  gap: 13px;
  flex-wrap: wrap;
  margin-top: 34px;
}
.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 52px;
  padding: 13px 23px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  transition: 0.2s ease;
}
.button:hover {
  transform: translateY(-2px);
}
.button.sand {
  background: var(--gold);
  color: #263747;
}
.button.ghost {
  border-color: rgba(255, 255, 255, 0.72);
  color: #fff;
}
.scroll-cue {
  position: absolute;
  z-index: 3;
  right: 5vw;
  bottom: 32px;
  display: flex;
  align-items: center;
  gap: 13px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.scroll-cue span {
  font-size: 21px;
}
.hero-geometry {
  position: absolute;
  z-index: 2;
  right: 5vw;
  top: 24%;
  width: 430px;
  height: 430px;
}
.hero-geometry .one {
  position: absolute;
  left: 30px;
  top: 0;
  width: 105px;
  height: 410px;
  border-radius: 70px;
  background: rgba(19, 49, 50, 0.94);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.15);
}
.hero-geometry .two {
  position: absolute;
  right: 0;
  top: 35px;
  width: 330px;
  height: 330px;
  border: 54px solid rgba(190, 124, 79, 0.78);
  border-radius: 50%;
}
.hero-geometry .new-whole {
  position: absolute;
  left: 157px;
  top: 145px;
  width: 145px;
  height: 145px;
  border-radius: 50%;
  background: rgba(235, 199, 127, 0.84);
  mix-blend-mode: screen;
  box-shadow: 0 0 70px rgba(240, 205, 135, 0.4);
}
.section {
  padding: 110px max(6vw, 28px);
}
.section-head {
  max-width: 1080px;
  margin-bottom: 52px;
}
.section-head.narrow {
  max-width: 900px;
}
.meaning {
  background: var(--paper);
}
.pair-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 50px;
}
.beginning-card {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 28px;
  min-height: 270px;
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: 26px;
}
.beginning-card .number {
  font-family: var(--serif);
  font-size: 95px;
  line-height: 1;
  color: var(--field);
}
.beginning-card h3 {
  margin: 10px 0 18px;
  font-size: 34px;
}
.beginning-card p {
  max-width: 520px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}
.one-card {
  background: #f3eee3;
}
.two-card {
  background: #ece2da;
}
.large-copy {
  max-width: 1000px;
  margin-bottom: 0;
  font-size: 18px;
  line-height: 1.68;
  color: #536970;
}
.loop {
  padding: 110px max(6vw, 28px);
  background: var(--night);
  color: #fff;
}
.loop-copy {
  max-width: 900px;
}
.loop-copy h2 {
  margin-bottom: 26px;
}
.loop-copy > p:last-child {
  max-width: 760px;
  color: #c1cecf;
  font-size: 16px;
}
.loop-cards {
  display: grid;
  grid-template-columns: 1fr 80px 1fr;
  align-items: center;
  gap: 18px;
  margin-top: 50px;
}
.loop-cards article {
  min-height: 260px;
  padding: 38px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 26px;
  background: rgba(255, 255, 255, 0.055);
}
.loop-cards article > span {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: #edcd91;
}
.loop-cards h3 {
  font-size: 38px;
  margin: 28px 0 16px;
}
.loop-cards p {
  color: #c6d0d0;
  margin: 0;
}
.loop-line {
  font-family: var(--serif);
  font-size: 46px;
  text-align: center;
  color: var(--gold);
}
.loop-result {
  max-width: 1050px;
  margin: 40px auto 0;
  padding-top: 34px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-family: var(--serif);
  font-size: 23px;
  line-height: 1.47;
  text-align: center;
  color: #f0e4cb;
}
.octave-section {
  background: #e9e1d4;
}
.row-head {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 7vw;
  align-items: end;
}
.row-head > p {
  margin-bottom: 8px;
  color: var(--muted);
}
.octave-map {
  position: relative;
}
.octave-visual {
  margin: 0;
  border-radius: 28px;
  overflow: hidden;
  background: #ded5c5;
}
.octave-visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3/2;
  object-fit: cover;
}
.octave-cards {
  position: absolute;
  inset: 0;
}
.octave-card {
  position: absolute;
  width: clamp(176px, 15vw, 224px);
  transform: translate(-50%, -50%);
  z-index: 1;
  color: #172f34;
}
.octave-card:hover,
.octave-card:focus-within,
.octave-card[open] {
  z-index: 10;
}
.octave-card summary {
  display: flex;
  align-items: center;
  gap: 11px;
  min-height: 52px;
  padding: 11px 17px;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 20px;
  background: rgba(255, 252, 244, 0.08);
  box-shadow:
    0 7px 22px rgba(33, 42, 39, 0.1),
    inset 0 0 0 1px rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(2px) saturate(0.96);
  cursor: pointer;
  list-style: none;
  text-shadow:
    0 1px 1px rgba(255, 255, 255, 1),
    0 0 7px rgba(255, 255, 255, 0.95);
  transition:
    transform 0.2s ease,
    background 0.2s ease;
}
.octave-card summary::-webkit-details-marker {
  display: none;
}
.octave-card summary:hover,
.octave-card summary:focus-visible,
.octave-card[open] summary {
  background: rgba(255, 252, 244, 0.2);
}
.octave-card summary:focus-visible {
  outline: 2px solid #b9873c;
  outline-offset: 3px;
}
.octave-card summary b {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.11em;
  color: #77511c;
}
.octave-card summary span {
  font-family: var(--serif);
  font-size: clamp(20px, 1.55vw, 24px);
  line-height: 1.05;
}
.octave-card p {
  margin: 8px 0 0;
  padding: 13px 16px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 16px;
  background: rgba(255, 252, 244, 0.22);
  box-shadow: 0 9px 24px rgba(32, 43, 40, 0.15);
  backdrop-filter: blur(4px);
  color: #243d40;
  font-size: 14px;
  line-height: 1.42;
}
.octave-card:hover p,
.octave-card:focus-within p,
.octave-card[open] p {
  display: block;
}
.stage-1 {
  left: 17.5%;
  top: 79%;
}
.stage-2 {
  left: 29%;
  top: 67.5%;
}
.stage-3 {
  left: 40.5%;
  top: 56.5%;
}
.stage-4 {
  left: 51.5%;
  top: 46.5%;
}
.stage-5 {
  left: 61.5%;
  top: 37.5%;
}
.stage-6 {
  left: 70.5%;
  top: 28.5%;
}
.stage-7 {
  left: 79.5%;
  top: 20%;
}
.stage-8 {
  left: 88.5%;
  top: 12%;
}
.recursive-formula {
  display: flex;
  align-items: center;
  gap: 30px;
  max-width: 900px;
  margin: 50px auto 0;
  padding: 30px 36px;
  border-radius: 24px;
  background: var(--forest);
  color: #fff;
}
.recursive-formula span {
  flex: none;
  font-family: var(--serif);
  font-size: 44px;
  color: #efd092;
}
.recursive-formula p {
  margin: 0;
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.4;
}
.practice {
  background: var(--paper);
}
.practice-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}
.practice-steps article {
  padding: 34px 30px 10px;
  border-right: 1px solid var(--line);
}
.practice-steps article:last-child {
  border-right: 0;
}
.practice-steps span {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--field);
  border-radius: 50%;
  font-family: var(--serif);
  font-size: 20px;
  color: var(--field);
}
.practice-steps h3 {
  font-size: 27px;
  margin: 28px 0 15px;
}
.practice-steps p {
  color: var(--muted);
}
.boundary {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 8vw;
  align-items: center;
  background: var(--mist);
}
.boundary aside {
  padding: 36px;
  border-top: 2px solid var(--clay);
  background: rgba(255, 255, 255, 0.6);
}
.boundary aside span {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.17em;
  color: var(--gold-dark);
}
.boundary aside p {
  margin: 18px 0 0;
  font-family: var(--serif);
  font-size: 23px;
  line-height: 1.42;
}
.footer {
  padding: 38px max(6vw, 28px);
  display: flex;
  align-items: center;
  gap: 30px;
  background: #101f22;
  color: #b7c5c4;
  font-size: 13px;
}
.footer p {
  margin: 0;
}
.footer > a:last-child {
  margin-left: auto;
}
.footer-brand {
  color: #fff;
  font-size: 20px;
}
.footer-brand .brand-mark {
  width: 31px;
  height: 31px;
}
a:focus-visible {
  outline: 3px solid #e5c78f;
  outline-offset: 4px;
}
@media (max-width: 1050px) {
  .site-header nav {
    display: none;
  }
  .hero-content {
    width: min(680px, 70vw);
  }
  .hero-geometry {
    right: -40px;
    opacity: 0.72;
  }
  .octave-card {
    width: 154px;
  }
  .octave-card summary {
    min-height: 46px;
    padding: 9px 12px;
  }
  .octave-card summary span {
    font-size: 17px;
  }
  .practice-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .practice-steps article:nth-child(2) {
    border-right: 0;
  }
}
@media (max-width: 700px) {
  body {
    font-size: 15px;
  }
  .site-header {
    height: 70px;
    padding: 0 20px;
  }
  .brand {
    font-size: 20px;
  }
  .brand-mark {
    width: 33px;
    height: 33px;
  }
  .header-link {
    margin-left: auto;
  }
  .hero {
    min-height: 780px;
  }
  .hero-content {
    width: 100%;
    margin: 0;
    padding: 85px 20px 20px;
    transform: translateY(-15px);
  }
  .hero h1 {
    font-size: 45px;
  }
  .hero-lead {
    font-size: 18px;
    max-width: 430px;
  }
  .hero-formula {
    font-size: 15px;
    max-width: 420px;
  }
  .hero-geometry {
    width: 280px;
    height: 280px;
    right: -105px;
    top: 39%;
    opacity: 0.42;
  }
  .hero-geometry .one {
    width: 70px;
    height: 270px;
  }
  .hero-geometry .two {
    width: 230px;
    height: 230px;
    border-width: 38px;
  }
  .hero-geometry .new-whole {
    left: 100px;
    top: 96px;
    width: 100px;
    height: 100px;
  }
  .actions {
    flex-direction: column;
    align-items: stretch;
  }
  .button {
    width: 100%;
  }
  .scroll-cue {
    left: 20px;
    right: auto;
  }
  .section,
  .loop {
    padding: 78px 20px;
  }
  h2 {
    font-size: 34px;
  }
  .pair-grid,
  .row-head,
  .boundary {
    grid-template-columns: 1fr;
  }
  .beginning-card {
    grid-template-columns: 70px 1fr;
    padding: 27px 22px;
    gap: 16px;
    min-height: 0;
  }
  .beginning-card .number {
    font-size: 62px;
  }
  .beginning-card h3 {
    font-size: 27px;
  }
  .large-copy {
    font-size: 16px;
  }
  .loop-cards {
    grid-template-columns: 1fr;
  }
  .loop-line {
    transform: rotate(90deg);
  }
  .loop-cards article {
    min-height: 0;
    padding: 28px 24px;
  }
  .loop-cards h3 {
    font-size: 31px;
  }
  .loop-result {
    text-align: left;
    font-size: 19px;
  }
  .octave-map {
    display: grid;
    gap: 14px;
  }
  .octave-visual {
    border-radius: 20px;
  }
  .octave-cards {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .octave-card {
    position: static;
    width: auto;
    transform: none;
  }
  .octave-card summary {
    min-height: 48px;
    border-color: rgba(91, 70, 39, 0.18);
    border-radius: 15px;
    background: rgba(255, 253, 248, 0.7);
    box-shadow: none;
  }
  .octave-card summary span {
    font-size: 16px;
  }
  .octave-card p {
    font-size: 13px;
  }
  .recursive-formula {
    align-items: flex-start;
    flex-direction: column;
    padding: 25px;
  }
  .practice-steps {
    grid-template-columns: 1fr;
  }
  .practice-steps article {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 27px 10px;
  }
  .boundary {
    gap: 35px;
  }
  .footer {
    align-items: flex-start;
    flex-direction: column;
    padding: 35px 20px;
  }
  .footer > a:last-child {
    margin-left: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}

/* OCTAVE_EDITOR_START */
.octave-card{width:213px}
.octave-card summary{background:rgba(255,252,244,0.00)}
.stage-1{left:21.42%;top:78.35%}
.stage-2{left:32.30%;top:66.12%}
.stage-3{left:42.01%;top:55.97%}
.stage-4{left:50.61%;top:46.41%}
.stage-5{left:58.93%;top:37.95%}
.stage-6{left:67.83%;top:30.34%}
.stage-7{left:73.11%;top:23.23%}
.stage-8{left:82.55%;top:15.28%}
@media(max-width:700px){.octave-card{position:static;width:auto;transform:none}}
/* OCTAVE_EDITOR_END */