:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f9;
  --color-bg-warm: #f5f3ee;
  --color-ink: #14171f;
  --color-muted: #5b6472;
  --color-accent: #2955a3;
  --color-accent-hover: #1f4380;
  --color-border: #e2e6ec;
  --color-light: #dceaff;
  --max-width: 1240px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 600ms;
  --duration-signature: 950ms;
}

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

html {
  min-width: 320px;
}

body,
h1,
p {
  margin: 0;
}

body {
  min-height: 100vh;
  background: var(--color-bg-warm);
  color: var(--color-ink);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a,
button {
  font: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgb(41 85 163 / 35%);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 12px;
  left: 16px;
  padding: 9px 13px;
  border-radius: 4px;
  background: var(--color-ink);
  color: #fff;
  font-weight: 650;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform var(--duration-fast) var(--ease);
}

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

.skip-link--light {
  background: #fff;
  color: var(--color-ink);
}

.site-header {
  display: flex;
  width: min(100% - 48px, var(--max-width));
  min-height: 104px;
  align-items: center;
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-ink);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: block;
  width: 38px;
  height: 38px;
  overflow: hidden;
  border-radius: 8px;
  flex: 0 0 auto;
  background: var(--color-ink);
}

.brand-mark__opening {
  position: absolute;
  top: 16px;
  left: -1px;
  width: 24px;
  height: 7px;
  border-radius: 0 999px 999px 0;
  background: var(--color-bg-warm);
  transform: scaleX(0.72);
  transform-origin: left;
  transition: transform var(--duration-slow) var(--ease);
}

.brand-mark__light {
  position: absolute;
  top: 6px;
  right: 10px;
  width: 3px;
  height: 26px;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 0 12px rgb(255 255 255 / 72%);
  transform: rotate(16deg);
}

.brand:hover .brand-mark__opening {
  transform: scaleX(1);
}

.brand__lockup {
  display: grid;
  gap: 1px;
}

.brand__name {
  font-size: 15px;
  font-weight: 750;
  letter-spacing: 0.055em;
  line-height: 1.25;
  text-transform: uppercase;
}

.brand__meaning {
  color: var(--color-muted);
  font-size: 9px;
  font-weight: 550;
  letter-spacing: 0.035em;
}

[lang="ja"] {
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

.preview-root {
  width: min(100% - 48px, var(--max-width));
  margin-inline: auto;
}

.preview-intro {
  display: grid;
  min-height: calc(100vh - 184px);
  align-items: center;
  gap: 72px;
  padding: 72px 0 112px;
}

.preview-intro__copy {
  max-width: 690px;
}

.eyebrow {
  margin-bottom: 22px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  font-size: clamp(2.6rem, 7vw, 5.9rem);
  font-weight: 720;
  letter-spacing: -0.065em;
  line-height: 0.98;
}

h1 span {
  color: var(--color-accent);
}

.intro {
  max-width: 580px;
  margin-top: 28px;
  color: var(--color-muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  gap: 14px;
  margin-top: 36px;
  padding: 0 22px;
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 650;
  text-decoration: none;
  transition: background var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease), transform var(--duration-fast) var(--ease);
}

.button:hover {
  border-color: var(--color-accent-hover);
  background: var(--color-accent-hover);
  transform: translateY(-2px);
}

.button span {
  transition: transform var(--duration-fast) var(--ease);
}

.button:hover span {
  transform: translateX(3px);
}

.private-frame {
  overflow: hidden;
  border: 1px solid rgb(20 23 31 / 14%);
  border-radius: 12px;
  background: var(--color-ink);
  box-shadow: 0 32px 70px rgb(20 23 31 / 15%);
  color: #fff;
}

.private-frame__topline {
  display: flex;
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 22px;
  border-bottom: 1px solid rgb(255 255 255 / 12%);
  color: rgb(255 255 255 / 67%);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.light-control {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 12px;
  padding: 5px 7px 5px 15px;
  border: 1px solid rgb(255 255 255 / 18%);
  border-radius: 999px;
  background: rgb(255 255 255 / 7%);
  color: #fff;
  cursor: pointer;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0;
  text-transform: none;
  transition: border-color var(--duration-fast) var(--ease), background var(--duration-fast) var(--ease);
}

.light-control:hover {
  border-color: rgb(255 255 255 / 36%);
  background: rgb(255 255 255 / 11%);
}

.mini-aperture {
  position: relative;
  display: block;
  width: 31px;
  height: 31px;
  overflow: hidden;
  border-radius: 50%;
  background: #0a0c11;
}

.mini-aperture::before {
  position: absolute;
  top: 13px;
  left: 0;
  width: 19px;
  height: 5px;
  border-radius: 0 999px 999px 0;
  background: var(--color-bg-warm);
  content: "";
  transform: scaleX(0.65);
  transform-origin: left;
  transition: transform var(--duration-slow) var(--ease);
}

.mini-aperture i {
  position: absolute;
  top: 5px;
  right: 8px;
  width: 2px;
  height: 21px;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 0 10px #fff;
  transform: rotate(16deg);
}

.private-frame.is-focused .mini-aperture::before {
  transform: scaleX(1);
}

.private-frame__field {
  position: relative;
  min-height: 360px;
  overflow: hidden;
  background:
    radial-gradient(circle at 75% 45%, rgb(41 85 163 / 18%), transparent 34%),
    linear-gradient(135deg, #14171f, #0b0d12);
}

.field-line {
  position: absolute;
  background: rgb(255 255 255 / 10%);
  transition: background var(--duration-slow) var(--ease), transform var(--duration-signature) var(--ease);
}

.field-line--one {
  top: 31%;
  right: 0;
  left: 0;
  height: 1px;
}

.field-line--two {
  top: 0;
  bottom: 0;
  left: 34%;
  width: 1px;
}

.field-line--three {
  top: 64%;
  right: 11%;
  left: 11%;
  height: 1px;
}

.field-aperture {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 136px;
  height: 136px;
  overflow: hidden;
  border: 1px solid rgb(255 255 255 / 11%);
  border-radius: 28px;
  background: #11141b;
  box-shadow: 0 22px 55px rgb(0 0 0 / 35%);
  transform: translate(-50%, -50%);
}

.field-aperture__opening {
  position: absolute;
  top: 59px;
  left: -2px;
  width: 88px;
  height: 18px;
  border-radius: 0 999px 999px 0;
  background: var(--color-bg-warm);
  transform: scaleX(0.56);
  transform-origin: left;
  transition: transform var(--duration-signature) var(--ease);
}

.field-aperture__light {
  position: absolute;
  top: 22px;
  right: 35px;
  width: 8px;
  height: 92px;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 0 22px rgb(255 255 255 / 65%);
  transform: rotate(16deg);
  transition: box-shadow var(--duration-slow) var(--ease), transform var(--duration-signature) var(--ease);
}

.field-label {
  position: absolute;
  right: 22px;
  bottom: 18px;
  color: rgb(255 255 255 / 38%);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.14em;
}

.private-frame.is-focused .field-aperture__opening {
  transform: scaleX(1);
}

.private-frame.is-focused .field-aperture__light {
  box-shadow: 0 0 38px rgb(255 255 255 / 95%), 0 0 90px rgb(41 85 163 / 58%);
  transform: translateX(4px) rotate(16deg);
}

.private-frame.is-focused .field-line {
  background: rgb(220 234 255 / 23%);
}

.private-frame.is-focused .field-line--one {
  transform: translateX(5%);
}

.private-frame.is-focused .field-line--two {
  transform: translateY(-5%);
}

.private-frame.is-focused .field-line--three {
  transform: translateX(-5%);
}

.private-frame__status {
  min-height: 66px;
  padding: 19px 22px;
  color: rgb(255 255 255 / 64%);
  font-size: 14px;
}

footer {
  display: flex;
  width: min(100% - 48px, var(--max-width));
  min-height: 80px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-inline: auto;
  border-top: 1px solid rgb(20 23 31 / 13%);
  color: var(--color-muted);
  font-size: 12px;
}

footer span:first-child {
  color: var(--color-ink);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.error-page {
  display: grid;
  min-height: 100vh;
  overflow: hidden;
  background:
    radial-gradient(circle at 80% 22%, rgb(41 85 163 / 30%), transparent 30%),
    var(--color-ink);
  color: #fff;
}

.error-content {
  align-self: center;
  width: min(100% - 48px, 820px);
  margin-inline: auto;
  padding: 64px 0;
}

.brand-mark--large {
  width: 64px;
  height: 64px;
  margin-bottom: 52px;
  border: 1px solid rgb(255 255 255 / 12%);
  background: #0b0d12;
}

.brand-mark--large .brand-mark__opening {
  top: 28px;
  width: 41px;
  height: 11px;
}

.brand-mark--large .brand-mark__light {
  top: 10px;
  right: 17px;
  width: 5px;
  height: 44px;
}

.error-content .eyebrow {
  color: #9bbcf1;
}

.error-content h1 {
  max-width: 800px;
  font-size: clamp(2.4rem, 6vw, 5rem);
}

.error-content > p:not(.eyebrow) {
  max-width: 540px;
  margin-top: 28px;
  color: rgb(255 255 255 / 66%);
}

.button--light {
  border-color: #fff;
  background: #fff;
  color: var(--color-ink);
}

.button--light:hover {
  border-color: var(--color-bg-warm);
  background: var(--color-bg-warm);
}

.error-signature {
  position: fixed;
  right: 24px;
  bottom: 18px;
  color: rgb(255 255 255 / 40%);
  font-size: 11px;
}

@media (min-width: 900px) {
  .preview-intro {
    grid-template-columns: minmax(0, 0.9fr) minmax(480px, 1.1fr);
  }
}

@media (max-width: 700px) {
  .site-header,
  .preview-root,
  footer {
    width: min(100% - 40px, var(--max-width));
  }

  .site-header {
    min-height: 86px;
  }

  .brand__meaning {
    display: none;
  }

  .preview-intro {
    min-height: auto;
    gap: 58px;
    padding: 64px 0 80px;
  }

  h1 {
    font-size: clamp(2.8rem, 14vw, 4.2rem);
  }

  .button {
    width: 100%;
  }

  .private-frame__topline {
    align-items: flex-start;
    flex-direction: column;
  }

  .light-control {
    width: 100%;
    justify-content: space-between;
  }

  .private-frame__field {
    min-height: 290px;
  }

  .field-aperture {
    width: 112px;
    height: 112px;
  }

  .field-aperture__opening {
    top: 49px;
    width: 72px;
    height: 15px;
  }

  .field-aperture__light {
    top: 19px;
    right: 29px;
    width: 6px;
    height: 76px;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 24px 0;
  }

  .error-content {
    padding-bottom: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}