:root {
  --ink: #171717;
  --paper: #fdfdfb;
  --blue: #3d93d3;
  --red: #8c4145;
  --jp-serif: "YuMincho", "Yu Mincho", "Hiragino Mincho ProN",
    "Hiragino Mincho Pro", "Noto Serif JP", serif;
  --ui-sans: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--jp-serif);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

main {
  overflow: clip;
}

.hero {
  position: relative;
  min-height: 112svh;
  display: grid;
  place-content: center;
  text-align: center;
  isolation: isolate;
}

.hero h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(4.5rem, 8vw, 11rem);
  font-weight: 400;
  line-height: 0.77;
  letter-spacing: -0.065em;
}

.eyebrow,
.section-number {
  margin: 0 0 1.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.24em;
}

.hero__jp {
  margin-top: 2rem;
  font-family: var(--jp-serif);
  font-size: clamp(0.92rem, 1.4vw, 1.15rem);
  letter-spacing: 0.3em;
}

.watercolor {
  position: absolute;
  z-index: -1;
  width: clamp(125px, 18vw, 270px);
  aspect-ratio: 1;
  border: 1px solid rgb(36 36 36 / 18%);
  border-radius: 48% 52% 45% 55% / 54% 44% 56% 46%;
  filter: blur(0.2px);
  opacity: 0.62;
  box-shadow: inset 18px -20px 35px rgb(255 255 255 / 70%);
}

.watercolor--pink {
  top: 18%;
  right: 8%;
  background: radial-gradient(circle at 62% 64%, #f4cfe5, #f9e4ef 55%, #fff);
}

.watercolor--yellow {
  top: 27%;
  right: -2%;
  background: radial-gradient(circle at 58% 50%, #fff29b, #fff8c8 55%, #fff);
}

.watercolor--orange {
  top: 40%;
  right: 6%;
  width: clamp(100px, 13vw, 200px);
  background: radial-gradient(circle at 58% 50%, #f4c88d, #f8dfbb 55%, #fff);
}

.watercolor--green {
  left: -3%;
  bottom: 23%;
  background: radial-gradient(circle at 58% 50%, #cdebd5, #e5f4e8 55%, #fff);
}

.watercolor--blue {
  left: 5%;
  bottom: 11%;
  background: radial-gradient(circle at 58% 50%, #b9dcf5, #dceefa 55%, #fff);
}

.watercolor--violet {
  left: 15%;
  bottom: 1%;
  background: radial-gradient(circle at 58% 50%, #d8dbf4, #ebecfa 55%, #fff);
}

.intro {
  min-height: 58svh;
  display: grid;
  align-content: center;
  justify-items: center;
  padding: 7rem 1.5rem;
  text-align: center;
}

.intro h2,
.bridge h2 {
  margin: 0 0 1.5rem;
  font-family: var(--jp-serif);
  font-size: clamp(2rem, 4vw, 4.4rem);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.intro > p:last-child,
.bridge > p:last-of-type {
  max-width: 42rem;
  margin: 0;
  font-size: clamp(0.9rem, 1.3vw, 1.12rem);
  line-height: 2;
  letter-spacing: 0.08em;
}

.principles-intro {
  min-height: clamp(360px, 58svh, 680px);
  display: grid;
  place-items: center;
  padding: clamp(6rem, 10vw, 10rem) max(8vw, 1.5rem);
  background: var(--paper);
  text-align: center;
}

.principles-intro__copy {
  width: min(100%, 54rem);
}

.principles-intro h2 {
  margin: 0 0 2rem;
  font-size: clamp(2rem, 4vw, 4.5rem);
  font-weight: 400;
  line-height: 1.35;
}

.principles-intro p {
  max-width: 46rem;
  margin: 0 auto;
  font-size: clamp(0.9rem, 1.3vw, 1.12rem);
  line-height: 2.2;
  letter-spacing: 0.08em;
}

.principles-intro h2:empty,
.principles-intro p:empty {
  display: none;
}

.principles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.principle-card {
  position: relative;
  aspect-ratio: 1 / 0.9;
  min-height: 420px;
  overflow: hidden;
}

.principle-card--text {
  display: grid;
  align-items: start;
  padding: clamp(2.2rem, 6vw, 7rem);
  color: #171717;
  background: #fff;
  isolation: isolate;
}

.principle-card .image-slot {
  position: absolute;
  inset: 0;
}

.principle-card__copy {
  position: absolute;
  z-index: 2;
  inset: clamp(2.25rem, 6vw, 6rem) clamp(1.75rem, 6vw, 6rem) auto;
  max-width: 34rem;
}

.principle-card--text .principle-card__copy {
  position: relative;
  inset: auto;
  padding: clamp(0.9rem, 1.5vw, 1.3rem);
  border: 0;
  border-radius: 0;
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.principle-card--text .principle-card__transparent-image {
  z-index: 0;
  background: transparent;
  pointer-events: none;
}

.principle-card--text .principle-card__transparent-image img {
  padding: clamp(1rem, 4vw, 4rem);
  object-fit: contain;
}

.principle-card--text
  .principle-card__transparent-image
  .image-slot__placeholder {
  display: none;
}

.principle-card--photo .principle-card__copy,
.principle-card--photo-dark .principle-card__copy {
  width: calc(100% - clamp(3.5rem, 12vw, 12rem));
  padding: clamp(0.9rem, 1.5vw, 1.3rem);
  border: 0;
  border-radius: 0;
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.principle-card--photo .principle-card__copy {
  color: #171717;
}

.principle-card--photo-dark .principle-card__copy {
  color: #fff;
}

.principle-card--copy-light .principle-card__copy,
.principle-card--copy-light .principle-card__copy * {
  color: #fff !important;
}

.principle-card--copy-dark .principle-card__copy,
.principle-card--copy-dark .principle-card__copy * {
  color: #171717 !important;
}

.principle-card__index {
  margin: 0 0 0.65rem;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
}

.principle-card h3 {
  margin: 0 0 1rem;
  font-size: clamp(1.45rem, 2.75vw, 3.1rem);
  font-weight: 400;
  line-height: 1.1;
}

.principle-card__copy > p:last-child {
  max-width: 32rem;
  margin: 0;
  font-size: clamp(0.72rem, 0.98vw, 0.94rem);
  line-height: 1.75;
}

.principle-card--photo-dark {
  color: #fff;
}

.image-slot {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgb(255 255 255 / 12%), transparent 50%),
    #d3d0c8;
}

.image-slot--dark {
  background:
    radial-gradient(circle at 45% 52%, #da72c4, transparent 22%),
    linear-gradient(135deg, #421267, #111c43 62%, #9c1c83);
}

.image-slot img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.image-slot__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 0.7rem;
  padding: 1rem;
  color: rgb(255 255 255 / 90%);
  text-align: center;
}

.image-slot__placeholder span {
  font-size: clamp(1rem, 2vw, 1.55rem);
  letter-spacing: 0.22em;
}

.image-slot__placeholder small {
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  opacity: 0.66;
}

.principle-card--photo .image-slot {
  background:
    radial-gradient(circle at 55% 44%, #b4d553 0 15%, transparent 16%),
    radial-gradient(circle at 68% 34%, #d34335 0 22%, transparent 23%),
    radial-gradient(circle at 34% 65%, #ee342d 0 30%, transparent 31%),
    #f5f1e7;
}

.bridge {
  min-height: 82svh;
  display: grid;
  align-content: center;
  justify-items: center;
  padding: 9rem 1.5rem;
  text-align: center;
}

.orbit {
  width: clamp(104px, 12vw, 165px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  margin-top: 5rem;
  border: 1px solid var(--ink);
  border-radius: 50%;
}

.orbit span {
  width: 68%;
  aspect-ratio: 1;
  border: 1px solid var(--ink);
  border-radius: 50%;
}

.color-pills {
  display: flex;
  gap: 0.55rem;
  margin-top: 1.6rem;
}

.color-pills i {
  width: 2.2rem;
  height: 0.75rem;
  border: 1px solid rgb(0 0 0 / 50%);
  border-radius: 999px;
}

.color-pills i:nth-child(1) {
  background: #efcfe0;
}

.color-pills i:nth-child(2) {
  background: #f5dd8b;
}

.color-pills i:nth-child(3) {
  background: #c3e0c9;
}

.color-pills i:nth-child(4) {
  background: #b8d7f0;
}

.color-pills i:nth-child(5) {
  background: #c9c8e8;
}

.members {
  min-height: 92svh;
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  align-items: center;
  padding: 8rem max(5vw, 1.5rem);
}

.members__list {
  padding-right: clamp(2rem, 7vw, 8rem);
}

.members h2 {
  margin: 0 0 3rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4vw, 4rem);
  font-weight: 400;
}

.member-buttons {
  border-top: 1px solid rgb(0 0 0 / 65%);
}

.member-buttons button {
  width: 100%;
  min-height: 4.7rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1rem;
  padding: 0.6rem 1rem;
  border: 0;
  border-bottom: 1px solid rgb(0 0 0 / 65%);
  background: transparent;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease;
}

.member-buttons button:hover,
.member-buttons button:focus-visible,
.member-buttons button.is-active {
  color: #fff;
  background: var(--red);
  outline: none;
}

.member-buttons button > span:first-child {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.5rem, 2.2vw, 2.2rem);
}

.member-button__arrow {
  color: var(--red);
  font-size: 0.75rem;
}

.member-buttons button:hover .member-button__arrow,
.member-buttons button:focus-visible .member-button__arrow,
.member-buttons button.is-active .member-button__arrow {
  color: #fff;
}

.members__prompt {
  min-height: 66vh;
  display: grid;
  grid-template-rows: auto 1fr;
  justify-items: center;
  gap: 2rem;
  padding-top: 5rem;
  border-left: 1px solid rgb(0 0 0 / 65%);
  font-size: clamp(1.4rem, 2vw, 2.3rem);
  letter-spacing: 0.06em;
}

.members__prompt-line {
  width: 1px;
  background: rgb(0 0 0 / 65%);
}

.member-detail {
  scroll-margin-top: 0;
  border-top: 1px solid #181818;
  background: #fff;
}

.members--detail {
  min-height: 100svh;
  display: block;
  padding: 0;
}

.members__detail {
  min-height: 100svh;
}

.member-detail__empty {
  min-height: 34vh;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 0.8rem;
  color: #6d6d68;
  letter-spacing: 0.12em;
}

.member-detail__empty span {
  font-size: 1.4rem;
}

.member-detail__toolbar {
  height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  border-bottom: 1px solid rgb(0 0 0 / 25%);
  background: #fff;
}

.member-detail__toolbar p {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.15rem;
}

.member-detail__toolbar p span {
  margin-left: 0.5rem;
  font-family: "Helvetica Neue", sans-serif;
  font-size: 0.62rem;
  letter-spacing: 0.18em;
}

.member-detail__toolbar button {
  padding: 0.55rem 1.15rem;
  border: 1px solid #222;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
}

.member-gallery {
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1fr 1.08fr;
  gap: clamp(2.5rem, 5vw, 6rem);
  align-items: center;
  padding: clamp(3rem, 8vw, 8rem) 5vw;
  color: var(--member-text);
  background: var(--member-bg);
  animation: member-in 420ms ease both;
}

@keyframes member-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.member-gallery__identity {
  min-height: 70vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 2.25rem 0 1rem;
  border-right: 1px solid currentColor;
}

.member-gallery__profile {
  width: 82%;
}

.member-gallery__name {
  width: 100%;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  border-top: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.4rem, 4vw, 4.8rem);
}

.member-gallery__description {
  margin: clamp(1.5rem, 3vw, 2.5rem) 0 0;
  font-family: var(--jp-serif);
  font-size: clamp(0.78rem, 1.05vw, 0.98rem);
  line-height: 2;
  letter-spacing: 0.055em;
}

.member-gallery__marker {
  width: 82%;
  margin-top: auto;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid currentColor;
  border-top: 0;
  border-right: 0;
  border-left: 0;
  color: var(--red);
  background: transparent;
  text-align: center;
  font-size: 0.85rem;
  cursor: pointer;
}

.member-gallery__marker:hover,
.member-gallery__marker:focus-visible {
  color: currentColor;
  outline: none;
}

.member-gallery__marker:focus-visible span {
  outline: 2px solid currentColor;
  outline-offset: 0.35rem;
}

.member-gallery__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 5px;
  aspect-ratio: 1;
}

.member-gallery__grid > .image-slot {
  aspect-ratio: 1;
  background:
    linear-gradient(135deg, rgb(255 255 255 / 12%), transparent 60%),
    var(--member-slot);
}

.palette-card {
  display: grid;
  grid-template-rows: 1fr 1fr;
  aspect-ratio: 1;
  overflow: hidden;
}

.palette-card__half {
  display: grid;
  place-items: center;
  padding: 0.5rem;
  font-size: clamp(0.8rem, 2vw, 1.55rem);
  font-style: italic;
  font-weight: 700;
  text-align: center;
}

footer {
  min-height: 22vh;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: 3rem 5vw;
  color: #fff;
  background: #151515;
  font-size: 1.rem;
  letter-spacing: 0.2em;
}

@media (max-width: 760px) {
  .hero {
    min-height: 100svh;
  }

  .hero h1 {
    font-size: clamp(4.3rem, 25vw, 7rem);
  }

  .principles {
    grid-template-columns: 1fr;
  }

  .principle-card {
    min-height: auto;
    aspect-ratio: 1;
  }

  .principle-card:nth-child(4) {
    order: 3;
  }

  .members {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-block: 7rem;
  }

  .members.members--detail {
    min-height: 100svh;
    padding: 0;
  }

  .members__list {
    padding-right: 0;
  }

  .members__prompt {
    display: none;
  }

  .member-gallery {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding: 3rem 1rem;
  }

  .member-gallery__identity {
    min-height: 52vh;
    padding: 0 0 1rem;
    border-right: 0;
  }

  .member-gallery__profile,
  .member-gallery__name,
  .member-gallery__marker {
    width: 100%;
  }

  .member-gallery__grid {
    width: 100%;
  }

  .image-slot__placeholder small {
    display: none;
  }

  .principle-card__copy {
    inset: auto 1.5rem 2rem;
  }

  footer {
    min-height: 20vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .member-gallery {
    animation: none;
  }
}

/* Full-screen hero image and watercolor introduction */
.hero {
  min-height: 100svh;
  overflow: hidden;
  color: #fff;
}

.hero__image,
.hero__shade {
  position: absolute;
  inset: 0;
}

.hero__image {
  z-index: -2;
}

.hero__image .image-slot {
  background:
    linear-gradient(135deg, #999997, #d8d8d5 52%, #858583);
}

.hero__shade {
  z-index: -1;
  background:
    linear-gradient(to bottom, rgb(0 0 0 / 24%), rgb(0 0 0 / 14%)),
    radial-gradient(circle at center, transparent 0 30%, rgb(0 0 0 / 27%) 100%);
}

.hero__copy {
  position: relative;
  z-index: 1;
  padding: 2rem;
  transform: translate(0, 10px);
}

.hero h1 {
  text-shadow: 0 2px 24px rgb(0 0 0 / 25%);
}

.intro {
  position: relative;
  min-height: 100svh;
  place-items: center;
  overflow: visible;
  isolation: isolate;
}

.intro .watercolor {
  z-index: 0;
}

.intro .watercolor--pink {
  top: 7%;
  right: 8%;
}

.intro .watercolor--yellow {
  top: 22%;
  right: -2%;
}

.intro .watercolor--orange {
  top: 45%;
  right: 6%;
}

.intro .watercolor--green {
  left: -3%;
  bottom: 31%;
}

.intro .watercolor--blue {
  left: 5%;
  bottom: 14%;
}

.intro .watercolor--violet {
  left: 15%;
  bottom: -2%;
}

.intro .watercolor--green,
.intro .watercolor--blue,
.intro .watercolor--violet {
  transform: translateY(clamp(1.25rem, 3vh, 2.25rem));
}

.intro__copy {
  position: relative;
  z-index: 2;
  width: min(100%, 56rem);
  max-width: none;
  padding: clamp(2rem, 5vw, 5rem);
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.intro__copy > p:last-child,
.harmony-lab__lead {
  font-size: clamp(0.9rem, 1.3vw, 1.12rem);
  line-height: 2;
  letter-spacing: 0.08em;
}

.intro__copy > p:last-child {
  max-width: 46rem;
  margin: 0 auto;
}

.harmony-lab__lead {
  max-width: 42rem;
  margin: 0;
}

/* The introduction rises over the pinned hero like a full-screen curtain. */
.hero-intro-transition {
  position: relative;
}

.hero-intro-transition .hero {
  position: sticky;
  z-index: 0;
  top: 0;
}

.hero-intro-transition .intro {
  position: relative;
  z-index: 1;
  background: var(--paper);
  box-shadow: 0 -1.5rem 3rem rgb(23 23 23 / 8%);
}

/* Every pair of color-study panels occupies one full viewport. */
.principles {
  grid-auto-rows: 100svh;
}

.principle-card {
  min-height: 100svh;
  aspect-ratio: auto;
}

/* Interactive color wheel */
.harmony-lab {
  --chosen-color: hsl(212 72% 56%);
  --paired-color: hsl(212 72% 56%);
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: clamp(5rem, 9vw, 9rem) 1.25rem;
  text-align: center;
  isolation: isolate;
}

.harmony-lab h2 {
  margin: 0 0 1rem;
  font-family: var(--jp-serif);
  font-size: clamp(2rem, 4vw, 4.4rem);
  font-weight: 400;
  letter-spacing: 0.04em;
}

.harmony-lab__color {
  position: absolute;
  z-index: -2;
  top: 0;
  bottom: 0;
  width: 50%;
  opacity: 0;
  transition:
    transform 700ms cubic-bezier(0.22, 1, 0.36, 1),
    opacity 260ms ease;
}

.harmony-lab__color::after {
  position: absolute;
  inset: clamp(0.7rem, 1.6vw, 1.6rem);
  border: clamp(0.7rem, 1.4vw, 1.35rem) solid currentColor;
  background: color-mix(in srgb, currentColor 24%, transparent);
  content: "";
}

.harmony-lab__color--left {
  left: 0;
  color: var(--chosen-color);
  background: color-mix(in srgb, var(--chosen-color) 13%, var(--paper));
  transform: translateX(-102%);
}

.harmony-lab__color--right {
  right: 0;
  color: var(--paired-color);
  background: color-mix(in srgb, var(--paired-color) 13%, var(--paper));
  transform: translateX(102%);
}

.harmony-lab.has-result .harmony-lab__color {
  opacity: 1;
  transform: translateX(0);
}

.harmony-lab__content {
  width: min(100%, 74rem);
  display: grid;
  justify-items: center;
  padding: clamp(2rem, 5vw, 5rem);
  border: 1px solid rgb(0 0 0 / 14%);
  background: rgb(253 253 251 / 82%);
  box-shadow: 0 26px 90px rgb(0 0 0 / 8%);
  backdrop-filter: blur(16px);
}

.harmony-lab__lead {
  margin-bottom: 2.5rem;
}

.color-wheel {
  position: relative;
  width: clamp(220px, 30vw, 360px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid rgb(0 0 0 / 28%);
  border-radius: 50%;
  background: conic-gradient(
    #f04444,
    #f2d63b,
    #4fc667,
    #3fcfd5,
    #447bea,
    #a84de0,
    #ee4a99,
    #f04444
  );
  box-shadow:
    0 0 0 10px rgb(255 255 255 / 85%),
    0 18px 55px rgb(0 0 0 / 14%);
  cursor: crosshair;
  touch-action: none;
}

.color-wheel:focus-visible {
  outline: 3px solid #151515;
  outline-offset: 14px;
}

.color-wheel::after {
  position: absolute;
  width: 64%;
  aspect-ratio: 1;
  border: 1px solid rgb(0 0 0 / 22%);
  border-radius: 50%;
  background: var(--paper);
  content: "";
}

.color-wheel__center {
  position: relative;
  z-index: 2;
  width: 50%;
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  gap: 0.3rem;
  border: 9px solid #fff;
  border-radius: 50%;
  color: #fff;
  box-shadow: 0 6px 22px rgb(0 0 0 / 18%);
  text-shadow: 0 1px 4px rgb(0 0 0 / 38%);
}

.color-wheel__center span {
  font-size: 0.6rem;
  letter-spacing: 0.22em;
}

.color-wheel__center strong {
  font-size: clamp(1.15rem, 2.4vw, 1.8rem);
}

.color-wheel__marker {
  position: absolute;
  z-index: 3;
  width: 1.2rem;
  aspect-ratio: 1;
  border: 4px solid #fff;
  border-radius: 50%;
  background: #111;
  box-shadow: 0 2px 8px rgb(0 0 0 / 45%);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.harmony-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 3rem;
}

.harmony-buttons button {
  min-height: 2.8rem;
  padding: 0.7rem 1.1rem;
  border: 1px solid #222;
  border-radius: 999px;
  background: rgb(255 255 255 / 80%);
  font-family: var(--ui-sans);
  font-size: clamp(0.75rem, 1.2vw, 0.95rem);
  cursor: pointer;
  transition:
    color 180ms ease,
    background 180ms ease,
    transform 180ms ease;
}

.harmony-buttons button:hover,
.harmony-buttons button:focus-visible,
.harmony-buttons button.is-active {
  color: #fff;
  background: #171717;
  outline: none;
  transform: translateY(-2px);
}

.harmony-result {
  min-height: 5.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.harmony-result__swatches {
  display: flex;
}

.harmony-result__swatches span {
  width: 2.5rem;
  aspect-ratio: 1;
  border: 3px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgb(0 0 0 / 20%);
}

.harmony-result__swatches span + span {
  margin-left: -0.65rem;
}

.harmony-result p {
  display: grid;
  gap: 0.28rem;
  margin: 0;
  text-align: left;
}

.harmony-result p span {
  font-size: 0.72rem;
  line-height: 1.5;
}

.harmony-result__empty {
  color: #777;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-align: center !important;
}

@media (max-width: 760px) {
  .principles {
    grid-auto-rows: auto;
  }

  .principle-card {
    min-height: 78svh;
    aspect-ratio: auto;
  }

  .intro__copy {
    padding-inline: 1.25rem;
  }

  .harmony-lab {
    padding-inline: 0.75rem;
  }

  .harmony-lab__content {
    padding: 3rem 1rem;
  }

  .harmony-lab__color::after {
    inset: 0.4rem;
    border-width: 0.55rem;
  }

  .harmony-buttons {
    gap: 0.45rem;
  }

  .harmony-buttons button {
    flex: 1 1 9rem;
  }

  .harmony-result {
    flex-direction: column;
  }

  .harmony-result p {
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .harmony-lab__color {
    transition: none;
  }
}

/* Compact two-page color-wheel spread with animated striped borders. */
.harmony-lab {
  height: 100svh;
  min-height: 680px;
  padding: clamp(1.25rem, 3.5vh, 2.75rem) clamp(1.25rem, 4vw, 4rem);
  background: #ecebe6;
  transition: background 300ms ease;
}

.harmony-lab.has-result {
  background:
    linear-gradient(
      105deg,
      color-mix(in srgb, var(--chosen-color) 20%, #ecebe6) 0 50%,
      color-mix(in srgb, var(--paired-color) 20%, #ecebe6) 50% 100%
    );
}

.harmony-lab__content {
  width: min(100%, 82rem);
  height: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(250px, 0.9fr);
  grid-template-rows: 1fr auto auto;
  grid-template-areas:
    "meta wheel"
    "buttons buttons"
    "result result";
  align-items: center;
  column-gap: clamp(2rem, 6vw, 7rem);
  padding: clamp(1rem, 2vw, 2rem);
  border: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
}

.harmony-lab__meta {
  grid-area: meta;
  max-width: 36rem;
  text-align: left;
}

.harmony-lab__meta .section-number {
  margin-bottom: 1rem;
}

.harmony-lab__lead {
  margin-bottom: 0;
}

.color-wheel {
  grid-area: wheel;
  width: min(30vw, 42vh, 340px);
  justify-self: center;
}

.harmony-buttons {
  grid-area: buttons;
  margin-top: 0.75rem;
}

.harmony-buttons button {
  background: transparent;
  backdrop-filter: blur(8px);
}

.harmony-result {
  grid-area: result;
  min-height: 4.5rem;
  margin-top: 0.5rem;
}

.harmony-lab__color {
  width: 50%;
  opacity: 0;
  background: transparent;
  transition: none;
}

.harmony-lab__color::before {
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
        90deg,
        var(--chosen-color) 0 5rem,
        var(--paired-color) 5rem 10rem
      )
      top / 100% clamp(1rem, 2vw, 1.8rem) no-repeat,
    repeating-linear-gradient(
        90deg,
        var(--paired-color) 0 5rem,
        var(--chosen-color) 5rem 10rem
      )
      bottom / 100% clamp(1rem, 2vw, 1.8rem) no-repeat;
  content: "";
}

.harmony-lab__color::after {
  inset: 0 auto 0 0;
  width: clamp(1rem, 2vw, 1.8rem);
  border: 0;
  background: repeating-linear-gradient(
    180deg,
    var(--chosen-color) 0 5rem,
    var(--paired-color) 5rem 10rem
  );
}

.harmony-lab__color--left {
  transform: translateX(-105%);
}

.harmony-lab__color--right {
  transform: translateX(105%);
}

.harmony-lab__color--right::after {
  right: 0;
  left: auto;
  background: repeating-linear-gradient(
    180deg,
    var(--paired-color) 0 5rem,
    var(--chosen-color) 5rem 10rem
  );
}

.harmony-lab.has-result .harmony-lab__color--left {
  animation: stripe-border-left 2500ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.harmony-lab.has-result .harmony-lab__color--right {
  animation: stripe-border-right 2500ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes stripe-border-left {
  from {
    opacity: 0;
    transform: translateX(-105%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes stripe-border-right {
  from {
    opacity: 0;
    transform: translateX(105%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@media (max-width: 760px) {
  .harmony-lab {
    height: auto;
    min-height: 100svh;
    padding: 1.25rem 0.75rem;
  }

  .harmony-lab__content {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto auto;
    grid-template-areas:
      "meta"
      "wheel"
      "buttons"
      "result";
    gap: 1rem;
    padding: 2.25rem 1rem;
  }

  .harmony-lab__meta {
    max-width: 30rem;
    text-align: center;
  }

  .color-wheel {
    width: min(54vw, 225px);
  }

  .harmony-buttons {
    margin-top: 0.25rem;
  }

  .harmony-result {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .harmony-lab.has-result .harmony-lab__color--left,
  .harmony-lab.has-result .harmony-lab__color--right {
    animation-duration: 1ms;
  }
}

/* Let the selected two-color pattern fill the full screen behind the controls. */
.harmony-lab.has-result {
  background: #d8d7d1;
}

.harmony-lab {
  --stripe-size: clamp(2.6rem, 5.8vh, 4rem);
}

.harmony-lab::after {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: rgb(255 255 255 / 5%);
  content: "";
  pointer-events: none;
}

.harmony-lab__content {
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
}

.harmony-lab__color {
  width: 100%;
}

.harmony-lab__color::before {
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    color-mix(in srgb, var(--paired-color) 64%, #f1efe9) 0 var(--stripe-size),
    transparent var(--stripe-size) calc(var(--stripe-size) * 2)
  );
}

.harmony-lab__color--right::before {
  background: repeating-linear-gradient(
    180deg,
    transparent 0 var(--stripe-size),
    color-mix(in srgb, var(--chosen-color) 64%, #f1efe9) var(--stripe-size)
      calc(var(--stripe-size) * 2)
  );
}

.harmony-lab__color::after {
  display: none;
}

.harmony-lab.has-result .harmony-lab__meta,
.harmony-lab.has-result .harmony-buttons,
.harmony-lab.has-result .harmony-result {
  text-shadow: 0 1px 10px rgb(255 255 255 / 70%);
}

.harmony-lab.has-result .harmony-buttons button {
  border-color: rgb(0 0 0 / 68%);
  background: rgb(255 255 255 / 24%);
}

.harmony-lab.has-result .harmony-buttons button:hover,
.harmony-lab.has-result .harmony-buttons button:focus-visible,
.harmony-lab.has-result .harmony-buttons button.is-active {
  color: #fff;
  background: rgb(23 23 23 / 90%);
  text-shadow: none;
}

@media (max-width: 760px) {
  .harmony-lab__content {
    background: transparent;
    backdrop-filter: none;
  }
}

/* Scroll-pinned color stories.
   Two cards stay side by side as one spread, while the next square spread
   rises from below like a curtain. */
.principles {
  position: relative;
  z-index: 1;
  display: block;
  margin-top: clamp(6rem, 14vh, 11rem);
  overflow: visible;
  background: #fdfdfb;
  isolation: isolate;
}

.principle-spread {
  position: sticky;
  top: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  height: 100svh;
  min-height: 680px;
  overflow: hidden;
  background: #fdfdfb;
  transform: translateZ(0);
}

.principle-spread:nth-child(1) {
  z-index: 1;
}

.principle-spread:nth-child(2) {
  z-index: 2;
}

.principle-spread:nth-child(3) {
  z-index: 3;
}

.principle-spread .principle-card,
.principle-spread .principle-card:not(:first-child) {
  position: relative;
  top: auto;
  width: 100%;
  height: 100%;
  min-height: 0;
  aspect-ratio: auto;
  overflow: hidden;
  border-radius: 0;
  box-shadow: none;
  transform: translateZ(0);
}

.principle-spread > .principle-card--text:first-child {
  align-items: end;
}

.principle-spread
  > .principle-card--text:first-child
  .principle-card__copy {
  transform: translate(-0.8rem, 0.8rem);
}

.principle-spread
  > .principle-card:first-child:not(.principle-card--text)
  .principle-card__copy {
  inset: auto clamp(1.75rem, 6vw, 6rem) clamp(2.25rem, 7vw, 7rem);
}

.principle-card .image-slot,
.principle-card .image-slot img {
  transform: translateZ(0);
}

.principle-card--text .principle-card__transparent-image img {
  transform: translateY(-2.5rem) translateZ(0);
}

.principle-card .image-slot::after {
  content: "";
  position: absolute;
  z-index: 1;
  inset: 0;
  background: rgb(255 255 255 / 22%);
  pointer-events: none;
}

.harmony-lab {
  z-index: 10;
}

@media (max-width: 760px) {
  .principles {
    grid-auto-rows: unset;
    margin-top: clamp(4rem, 10vh, 7rem);
  }

  .principle-spread {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    height: 100svh;
    min-height: 620px;
  }

  .principle-spread .principle-card {
    height: 100%;
    min-height: 0;
    border-radius: 0;
  }

  .principle-spread .principle-card__copy {
    inset: 1.5rem 1rem auto;
  }

  .principle-spread .principle-card--text .principle-card__copy {
    inset: auto;
    padding: 0.85rem;
  }

  .principle-spread
    > .principle-card--text:first-child
    .principle-card__copy {
    transform: translate(-0.35rem, 0.45rem);
  }

  .principle-spread .principle-card--photo .principle-card__copy,
  .principle-spread .principle-card--photo-dark .principle-card__copy {
    width: calc(100% - 2rem);
    padding: 0.85rem;
  }

  .principle-spread
    > .principle-card:first-child:not(.principle-card--text)
    .principle-card__copy {
    inset: auto 1rem 1.5rem;
  }
}

.back-to-top {
  position: fixed;
  z-index: 100;
  top: 1.15rem;
  left: 1.15rem;
  display: grid;
  justify-items: start;
  padding: 0.2rem;
  border: 0;
  background: transparent;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  letter-spacing: -0.03em;
  line-height: 0.82;
  opacity: 0;
  transform: translateY(-0.5rem);
  pointer-events: none;
  cursor: pointer;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  transition:
    opacity 220ms ease,
    transform 220ms ease,
    color 180ms ease;
}

.back-to-top span {
  display: block;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: transparent;
  outline: none;
}

.back-to-top:focus-visible {
  outline: 1px solid currentColor;
  outline-offset: 0.35rem;
  box-shadow: none;
}

@media (max-width: 760px) {
  .back-to-top {
    top: 0.75rem;
    left: 0.75rem;
    font-size: 1.7rem;
  }
}