.about-shell {
  background:
    radial-gradient(circle at 6% 8%, rgba(255, 79, 83, .045), transparent 22rem),
    radial-gradient(circle at 92% 12%, rgba(50, 117, 242, .050), transparent 24rem),
    var(--paper);
}

.about-hero {
  min-height: min(760px, calc(100vh - 72px));
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(32,36,42,.07);
  isolation: isolate;
}

.about-ink-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.about-hero-inner {
  min-height: inherit;
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(420px, 1.08fr);
  align-items: center;
  gap: 34px;
  position: relative;
  z-index: 2;
  padding-top: 36px;
  padding-bottom: 70px;
}

.about-hero-copy {
  position: relative;
  z-index: 3;
}

.about-hero-copy h1 {
  margin-top: 16px;
  max-width: 760px;
  font-size: clamp(58px, 6.7vw, 104px);
  line-height: .98;
  letter-spacing: -.062em;
}

.about-hero-copy h1 span { white-space: nowrap; }

html[lang="ja"] .about-hero-copy h1 {
  max-width: 720px;
  font-size: clamp(50px, 5.8vw, 86px);
  line-height: 1.10;
  letter-spacing: -.055em;
}

html[lang="ja"] .about-hero-copy h1 span { white-space: normal; }

.about-bird-stage {
  min-height: 500px;
  display: grid;
  place-items: center;
  position: relative;
  z-index: 2;
  transform: translate3d(var(--about-bird-x, 0px), var(--about-bird-y, 0px), 0) rotate(var(--about-bird-r, 0deg));
  transition: transform .52s cubic-bezier(.2,.75,.2,1);
}

.about-bird-stage img {
  width: min(52vw, 760px);
  max-width: none;
  height: auto;
  object-fit: contain;
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 28px 38px rgba(25,31,38,.11));
  animation: aboutBirdFloat 7.8s ease-in-out infinite;
}

.about-bird-halo {
  position: absolute;
  width: min(38vw, 520px);
  aspect-ratio: 1.2;
  border-radius: 46% 54% 54% 46% / 42% 50% 50% 58%;
  background:
    radial-gradient(ellipse at 24% 46%, rgba(255,78,92,.10), transparent 46%),
    radial-gradient(ellipse at 48% 68%, rgba(255,196,55,.08), transparent 43%),
    radial-gradient(ellipse at 68% 32%, rgba(55,143,244,.11), transparent 45%),
    radial-gradient(ellipse at 78% 66%, rgba(126,86,218,.085), transparent 42%);
  filter: blur(16px);
  z-index: 0;
}

.about-hero-foot {
  position: absolute;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 4;
  color: #a0a3a8;
  font-size: 10px;
  letter-spacing: .19em;
}

.about-scroll-line {
  display: block;
  width: 34px;
  height: 1px;
  background: rgba(32,36,42,.16);
}

.about-section { padding: 112px 0; }

.about-split {
  display: grid;
  grid-template-columns: minmax(150px, .34fr) minmax(0, 1fr);
  gap: 72px;
  align-items: start;
}

.about-section-label { padding-top: 9px; }

.about-copy-large { max-width: 880px; }

.about-copy-large h2,
.about-choice-card h2,
.about-section-head h2,
.about-final h2 {
  margin: 0;
  font-size: clamp(42px, 5.2vw, 72px);
  line-height: 1.08;
  letter-spacing: -.052em;
}

html[lang="ja"] .about-copy-large h2,
html[lang="ja"] .about-choice-card h2,
html[lang="ja"] .about-section-head h2,
html[lang="ja"] .about-final h2 {
  letter-spacing: -.038em;
  line-height: 1.22;
}

.about-lead {
  margin: 34px 0 0;
  max-width: 760px;
  font-size: clamp(21px, 2.2vw, 28px);
  line-height: 1.62;
  color: #41464d;
  letter-spacing: -.018em;
}

.about-copy-large > p:not(.about-lead) {
  margin: 24px 0 0;
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.85;
}

html[lang="ja"] .about-copy-large > p { line-height: 2; }

.about-choice-section {
  padding-top: 38px;
  padding-bottom: 118px;
}

.about-choice-card {
  min-height: 500px;
  position: relative;
  overflow: hidden;
  border-radius: 36px;
  padding: clamp(48px, 6vw, 82px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background:
    radial-gradient(circle at 80% 22%, rgba(74,131,255,.11), transparent 34%),
    radial-gradient(circle at 16% 84%, rgba(255,83,99,.09), transparent 34%),
    rgba(247,247,249,.88);
  border: 1px solid rgba(32,36,42,.055);
}

.about-choice-card::after {
  content: "";
  position: absolute;
  left: -7%;
  right: -7%;
  top: 33%;
  height: 90px;
  background: linear-gradient(90deg,
    rgba(255,74,92,.14),
    rgba(255,180,55,.12) 19%,
    rgba(72,194,137,.11) 38%,
    rgba(40,173,240,.14) 58%,
    rgba(74,112,239,.14) 73%,
    rgba(137,82,218,.12) 88%,
    rgba(245,99,164,.10));
  border-radius: 48% 52% 46% 54% / 58% 42% 58% 42%;
  filter: blur(18px);
  transform: rotate(-4deg);
  opacity: .82;
}

.about-choice-card > *:not(.about-choice-orbit) {
  position: relative;
  z-index: 2;
}

.about-choice-card h2 {
  margin-top: 14px;
  max-width: 930px;
}

.about-choice-card p {
  margin: 28px 0 0;
  max-width: 760px;
  color: #5c6168;
  font-size: 19px;
  line-height: 1.8;
}

.about-choice-orbit {
  position: absolute;
  width: 360px;
  height: 360px;
  right: -110px;
  top: -110px;
  border: 1px solid rgba(32,36,42,.06);
  border-radius: 50%;
  box-shadow:
    0 0 0 54px rgba(255,255,255,.24),
    0 0 0 108px rgba(255,255,255,.14);
}

.about-principles {
  border-top: 1px solid rgba(32,36,42,.07);
  border-bottom: 1px solid rgba(32,36,42,.07);
}

.about-section-head { max-width: 860px; margin-bottom: 58px; }
.about-section-head h2 { margin-top: 14px; }

.about-principle-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.about-principle {
  min-height: 310px;
  padding: 24px 0 0;
  border-top: 1px solid rgba(32,36,42,.16);
}

.about-principle-number {
  margin-bottom: 70px;
  color: #9a9ea4;
  font-size: 12px;
  letter-spacing: .13em;
  font-variant-numeric: tabular-nums;
}

.about-principle h3 {
  font-size: clamp(23px, 2.1vw, 31px);
  line-height: 1.16;
  letter-spacing: -.038em;
}

html[lang="ja"] .about-principle h3 { line-height: 1.35; letter-spacing: -.025em; }

.about-principle p {
  margin: 16px 0 0;
  max-width: 29ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.72;
}

.about-range-section { padding-top: 128px; }

.about-final {
  padding: 48px 0 132px;
}

.about-final-rule {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg,
    rgba(255,79,83,.7),
    rgba(255,184,53,.7),
    rgba(54,194,133,.7),
    rgba(49,169,239,.7),
    rgba(74,117,242,.7),
    rgba(134,84,220,.7),
    rgba(238,98,166,.7));
  opacity: .6;
  margin-bottom: 64px;
}

.about-final-kicker {
  margin: 0 0 12px;
  color: #85898f;
  font-size: 13px;
  letter-spacing: .04em;
}

.about-final h2 { max-width: 900px; }
.about-footer { margin-top: 0; }

@keyframes aboutBirdFloat {
  0%,100% { transform: translate3d(0,0,0) rotate(0deg); }
  45% { transform: translate3d(0,-10px,0) rotate(.45deg); }
  70% { transform: translate3d(4px,-4px,0) rotate(-.25deg); }
}

@media (max-width: 1020px) {
  .about-hero-inner { grid-template-columns: minmax(0, .95fr) minmax(360px, 1.05fr); }
  .about-bird-stage img { width: min(58vw, 680px); }
  .about-principle-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 48px; }
  .about-principle { min-height: 270px; }
}

@media (max-width: 820px) {
  .about-hero { min-height: auto; }
  .about-hero-inner {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 18px;
    padding-top: 72px;
    padding-bottom: 68px;
  }
  .about-hero-copy h1 { font-size: clamp(52px, 13vw, 76px); }
  html[lang="ja"] .about-hero-copy h1 { font-size: clamp(44px, 11.6vw, 66px); }
  .about-bird-stage { min-height: 360px; }
  .about-bird-stage img { width: min(108vw, 650px); transform: translateX(6%); }
  .about-bird-halo { width: min(86vw, 500px); }
  .about-hero-foot { display: none; }
  .about-section { padding: 84px 0; }
  .about-split { grid-template-columns: 1fr; gap: 28px; }
  .about-section-label { padding-top: 0; }
  .about-choice-section { padding-top: 12px; padding-bottom: 88px; }
  .about-choice-card { min-height: 440px; padding: 42px 30px; border-radius: 28px; }
  .about-principle-grid { grid-template-columns: 1fr; row-gap: 34px; }
  .about-principle { min-height: 0; padding-bottom: 22px; }
  .about-principle-number { margin-bottom: 34px; }
  .about-range-section { padding-top: 90px; }
  .about-final { padding-bottom: 94px; }
}

@media (max-width: 560px) {
  .about-hero-inner { padding-top: 60px; }
  .about-bird-stage { min-height: 300px; }
  .about-bird-stage img { width: min(118vw, 590px); }
  .about-copy-large h2,
  .about-choice-card h2,
  .about-section-head h2,
  .about-final h2 { font-size: clamp(36px, 10vw, 50px); }
  .about-lead { font-size: 20px; }
  .about-copy-large > p:not(.about-lead),
  .about-choice-card p { font-size: 17px; }
  .about-choice-card { min-height: 410px; }
  .about-final-rule { margin-bottom: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  .about-bird-stage img { animation: none !important; }
  .about-bird-stage { transition: none !important; }
}