:root {
  --ink: #0d1720;
  --muted: #61727d;
  --line: #d9e5ea;
  --paper: #f6fbfd;
  --white: #fff;
  --blue: #1aa0e0;
  --blue2: #79d4ff;
  --header-h: 108px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans JP", "Yu Gothic", Meiryo, system-ui, sans-serif;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  color: inherit;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

#gl {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100vh;
  z-index: 2;
  pointer-events: none;
}
.grain {
  position: fixed;
  inset: 0;
  z-index: 30;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.74' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.12'/%3E%3C/svg%3E");
}
.flash {
  position: fixed;
  inset: 0;
  z-index: 99;
  background:
    radial-gradient(
      circle at 50% 42%,
      rgba(255, 255, 255, 1) 0 7%,
      rgba(255, 255, 255, 0.9) 15%,
      rgba(255, 255, 255, 0.2) 32%,
      rgba(255, 255, 255, 0) 52%
    ),
    radial-gradient(
      circle at 50% 55%,
      rgba(121, 212, 255, 0.28) 0,
      rgba(121, 212, 255, 0) 42%
    ),
    linear-gradient(180deg, rgba(255, 255, 255, 0.28), rgba(255, 255, 255, 0));
  opacity: 0;
  pointer-events: none;
}
.flash.is-on {
  animation: flash 0.95s cubic-bezier(0.16, 0.84, 0.18, 1);
}
@keyframes flash {
  0% {
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  36% {
    opacity: 0.65;
  }
  100% {
    opacity: 0;
  }
}

.site-head {
  height: var(--header-h);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 5vw;
  border-bottom: 1px solid rgba(10, 22, 30, 0.06);
  background: rgba(250, 252, 253, 0.34);
  backdrop-filter: blur(18px);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 18px;
}
.brand strong {
  font-size: 28px;
  letter-spacing: 0.06em;
}
.brand span,
.site-head nav a,
.sound-toggle {
  font-family: "Arial Narrow", "Roboto Condensed", sans-serif;
  letter-spacing: 0.16em;
  font-size: 12px;
  font-weight: 800;
}
.brand span {
  font-size: 10px;
  color: #78909d;
}
.site-head nav {
  display: flex;
  gap: 52px;
}
.site-head nav a {
  position: relative;
}
.site-head nav a:after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -8px;
  height: 2px;
  background: var(--blue);
  transition: 0.25s;
}
.site-head nav a:hover:after {
  right: 0;
}
.sound-toggle {
  justify-self: end;
  border: 0;
  background: none;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: opacity 0.25s;
}
.sound-toggle i {
  width: 20px;
  height: 17px;
  display: flex;
  align-items: flex-end;
  gap: 3px;
}
.sound-toggle i b {
  display: block;
  width: 3px;
  background: currentColor;
  border-radius: 2px;
}
.sound-toggle i b:nth-child(1) {
  height: 7px;
}
.sound-toggle i b:nth-child(2) {
  height: 15px;
}
.sound-toggle i b:nth-child(3) {
  height: 11px;
}
.sound-toggle[aria-pressed="true"] i b {
  animation: bars 0.55s ease-in-out infinite alternate;
}
.sound-toggle[aria-pressed="true"] i b:nth-child(2) {
  animation-delay: 0.15s;
}
.sound-toggle[aria-pressed="true"] i b:nth-child(3) {
  animation-delay: 0.3s;
}
.sound-toggle.is-disabled {
  opacity: 0.4;
  cursor: default;
}
@keyframes bars {
  to {
    height: 4px;
  }
}

.hero {
  height: 100svh;
  min-height: 860px;
  position: relative;
  overflow: hidden;
  background: linear-gradient(
    180deg,
    #fbffff 0%,
    #e8fcff 12%,
    #cef8ff 23%,
    #9decfa 34%,
    #67dcef 45%,
    #35c7e2 53%,
    #49cde3 61%,
    #82ddea 70%,
    #b9eff4 83%,
    #edfcff 100%
  );
}
.hero-scenery,
.hero-scenery > div {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-scenery {
  z-index: 0;
}
/* v6.7: PCでは土星まわりの黄色い発光を一旦無効化。
   元の指定は下記。必要になればコメント解除で戻せます。
.hero-sun{background:radial-gradient(circle at 50% 17%,rgba(255,249,236,.98) 0 7%,rgba(255,245,218,.7) 12%,rgba(255,255,255,.38) 22%,rgba(255,255,255,0) 36%)}
*/
.hero-sun {
  background: none;
}
@media (max-width: 720px) {
  .hero-sun {
    background: radial-gradient(
      circle at 50% 17%,
      rgba(255, 249, 236, 0.98) 0 7%,
      rgba(255, 245, 218, 0.7) 12%,
      rgba(255, 255, 255, 0.38) 22%,
      rgba(255, 255, 255, 0) 36%
    );
  }
}
.hero-cloud {
  filter: blur(6px);
}
.hero-cloud-a {
  background:
    radial-gradient(
      34% 10% at 18% 39%,
      rgba(72, 177, 200, 0.16) 0 54%,
      transparent 55%
    ),
    radial-gradient(
      40% 10% at 80% 40%,
      rgba(55, 161, 190, 0.14) 0 54%,
      transparent 55%
    );
}
.hero-cloud-b {
  background:
    radial-gradient(
      18% 5% at 50% 43%,
      rgba(255, 255, 255, 0.82) 0 56%,
      transparent 57%
    ),
    radial-gradient(
      36% 9% at 52% 46%,
      rgba(235, 253, 255, 0.42) 0 54%,
      transparent 55%
    );
}
.hero-haze {
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0) 0 44%,
      rgba(231, 253, 255, 0.3) 50%,
      rgba(213, 249, 253, 0.11) 59%,
      rgba(255, 255, 255, 0) 70%
    ),
    radial-gradient(
      65% 14% at 50% 58%,
      rgba(242, 255, 255, 0.46) 0,
      rgba(255, 255, 255, 0) 70%
    );
}
.hero-ripples {
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0) 0 49%,
      rgba(255, 255, 255, 0.14) 51%,
      rgba(255, 255, 255, 0) 53%
    ),
    repeating-linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.22) 0 2px,
      rgba(255, 255, 255, 0) 2px 14px
    ),
    radial-gradient(
      120% 55% at 50% 70%,
      rgba(255, 255, 255, 0.24) 0,
      rgba(255, 255, 255, 0) 66%
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0) 0 12%,
      rgba(255, 255, 255, 0.08) 24%,
      rgba(255, 255, 255, 0) 36%,
      rgba(255, 255, 255, 0.08) 58%,
      rgba(255, 255, 255, 0) 70%,
      rgba(255, 255, 255, 0.08) 84%,
      rgba(255, 255, 255, 0) 100%
    );
  background-size:
    100% 100%,
    100% 100%,
    100% 100%,
    220% 100%;
  background-position:
    0 0,
    0 0,
    0 0,
    0 0;
  mask-image: linear-gradient(
    180deg,
    transparent 0 43%,
    rgba(0, 0, 0, 0.95) 50%,
    rgba(0, 0, 0, 0.98) 92%,
    rgba(0, 0, 0, 0.08) 100%
  );
  opacity: 0.74;
  animation:
    waterDrift 8s ease-in-out infinite alternate,
    waterSlide 16s linear infinite;
}
@keyframes waterDrift {
  0% {
    transform: translateY(0) scaleY(1);
  }
  50% {
    transform: translateY(6px) scaleY(1.04);
  }
  100% {
    transform: translateY(-4px) scaleY(0.985);
  }
}
@keyframes waterSlide {
  from {
    background-position:
      0 0,
      0 0,
      0 0,
      0 0;
  }
  to {
    background-position:
      0 0,
      0 0,
      0 0,
      220% 0;
  }
}
.hero:before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(
      74% 28% at 50% 53%,
      rgba(255, 255, 255, 0.58) 0,
      rgba(255, 255, 255, 0.15) 46%,
      rgba(255, 255, 255, 0) 78%
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.55) 0,
      rgba(255, 255, 255, 0) 11%,
      rgba(255, 255, 255, 0) 89%,
      rgba(255, 255, 255, 0.42) 100%
    );
  pointer-events: none;
}

.hero-eyebrow {
  position: absolute;
  z-index: 5;
  top: calc(var(--header-h) + 26px);
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 18px;
  white-space: nowrap;
  font-family: "Arial Narrow", sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: #5b7380;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.45);
}
.hero-eyebrow i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
}
.hero-hint {
  position: absolute;
  z-index: 15;
  left: 4.2vw;
  top: 54%;
  width: 98px;
  height: 98px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(15, 24, 33, 0.12);
  box-shadow: 0 16px 50px rgba(61, 101, 120, 0.14);
  font-family: "Arial Narrow", sans-serif;
  letter-spacing: 0.18em;
  transition:
    opacity 0.4s,
    transform 0.4s;
}
.hero-hint b {
  font-size: 12px;
}
.hero-hint span {
  font-size: 8px;
  margin-top: 4px;
  color: #81939c;
}
.hero-hint.is-hidden {
  opacity: 0;
  transform: scale(0.7);
}

.intro-sparks {
  position: absolute;
  inset: 0;
  z-index: 8;
  pointer-events: none;
  overflow: hidden;
}
.intro-sparks span {
  position: absolute;
  left: 50%;
  top: 36%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    #fff 0 35%,
    #80d7ff 45%,
    rgba(128, 215, 255, 0) 75%
  );
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.2);
  filter: drop-shadow(0 0 10px rgba(121, 212, 255, 0.95));
}
.intro-sparks span:after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 88px;
  height: 2px;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0),
    rgba(180, 236, 255, 0.9),
    rgba(255, 255, 255, 0)
  );
  transform: translate(-50%, -50%) rotate(var(--rot, 0deg));
  opacity: 0.55;
}
.intro-sparks.is-burst span {
  animation: sparkBurst 1.25s cubic-bezier(0.16, 0.84, 0.18, 1) forwards;
}
@keyframes sparkBurst {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.15);
  }
  10% {
    opacity: 1;
  }
  68% {
    opacity: 0.9;
  }
  100% {
    opacity: 0;
    transform: translate(calc(-50% + var(--tx)), calc(-50% + var(--ty)))
      scale(1.4);
  }
}

.selection-shell {
  position: absolute;
  z-index: 6;
  left: 4vw;
  right: 4vw;
  bottom: max(10px, calc(env(safe-area-inset-bottom) + 6px));
}
.selection {
  position: relative;
  display: grid;
  grid-template-columns: 118px minmax(260px, 1fr) minmax(300px, 1fr) 230px;
  gap: 20px;
  align-items: center;
  padding: 22px 26px;
  border-radius: 34px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.84) 0%,
    rgba(249, 253, 254, 0.7) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(14px);
  box-shadow:
    0 18px 60px rgba(45, 78, 92, 0.16),
    0 0 0 1px rgba(176, 208, 221, 0.18) inset;
  transition:
    opacity 0.25s,
    transform 0.3s;
}
.selection:before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.36),
    rgba(255, 255, 255, 0) 40%,
    rgba(122, 214, 255, 0.07) 100%
  );
  pointer-events: none;
}
.selection.is-out {
  opacity: 0.22;
  transform: translateY(6px);
}
.selection-no,
.selection-title,
.selection-desc,
.selection-actions {
  position: relative;
  z-index: 1;
}
.selection-no span {
  display: block;
  font-family: "Arial Narrow", sans-serif;
  font-size: 10px;
  letter-spacing: 0.26em;
  color: #5f7581;
  margin-bottom: 2px;
}
.selection-no strong {
  font-family: Impact, "Arial Narrow", sans-serif;
  font-size: 90px;
  line-height: 0.82;
  color: #eaf4fa;
  font-weight: 400;
  letter-spacing: -0.02em;
  text-shadow:
    0 10px 26px rgba(52, 83, 98, 0.14),
    0 0 1px rgba(29, 94, 126, 0.09);
}
.selection-title p {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  font-weight: 800;
  color: #17323c;
}
.selection-title p:before {
  content: "◆";
  color: var(--blue);
  margin-right: 12px;
  font-size: 9px;
}
.selection-title h1 {
  margin: 0;
}
.selection-title h1 > span {
  display: block;
  font-family: Impact, "Arial Narrow", sans-serif;
  font-size: 40px;
  line-height: 0.92;
  letter-spacing: 0.01em;
  font-weight: 400;
  color: #fdfefe;
  text-shadow:
    0 10px 28px rgba(38, 64, 76, 0.35),
    0 0 1px rgba(12, 27, 36, 0.24);
}
.selection-title h1 small {
  display: block;
  font-size: 15px;
  margin-top: 8px;
  letter-spacing: 0.04em;
  color: #17323c;
}
.selection-desc > p:first-child {
  margin: 0;
  color: #20363f;
  line-height: 1.75;
  font-size: 15px;
  max-width: 520px;
}
.selection-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  margin: 11px 0 0 !important;
  font-family: "Arial Narrow", sans-serif;
  letter-spacing: 0.16em;
  font-size: 10px !important;
}
.selection-meta span {
  color: #5d7682;
}
.selection-meta b {
  color: #20353d;
}
.selection-actions {
  justify-self: end;
  display: grid;
  gap: 12px;
}
.site-link {
  width: 210px;
  height: 72px;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  font-weight: 800;
  box-shadow: 0 16px 44px rgba(45, 78, 92, 0.14);
  transition: 0.25s;
}
.site-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 46px rgba(54, 92, 110, 0.18);
}
.site-link b {
  font-size: 22px;
  font-weight: 400;
}
.selection-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 8px 12px;
  border-radius: 42px;
  background: rgba(255, 255, 255, 0.66);
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 34px rgba(45, 78, 92, 0.08);
}
.selection-nav button {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(110, 150, 170, 0.2);
  background: rgba(255, 255, 255, 0.88);
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  transition: 0.2s;
}
.selection-nav button:hover {
  background: #fff;
}
.selection-nav span {
  min-width: 76px;
  text-align: center;
  font-family: "Arial Narrow", sans-serif;
  font-size: 13px;
  letter-spacing: 0.14em;
}
.selection-nav i {
  font-style: normal;
  color: #9aaab2;
  margin: 0 8px;
}
.scroll-cue {
  position: absolute;
  z-index: 7;
  right: 2.4vw;
  bottom: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: "Arial Narrow", sans-serif;
  font-size: 8px;
  letter-spacing: 0.18em;
  color: #78909b;
}
.scroll-cue i {
  width: 1px;
  height: 34px;
  background: linear-gradient(
    180deg,
    rgba(120, 144, 155, 0),
    rgba(120, 144, 155, 0.85)
  );
}

/* v6.6: blocking loader styles removed. */
.section {
  position: relative;
  z-index: 10;
  background: #fff;
  padding: 80px 8vw;
}
.section-kicker {
  margin: 0 0 22px;
  font-family: "Arial Narrow", sans-serif;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: #718590;
  position: relative;
  z-index: 2;
}
.section h2 {
  font-size: clamp(35px, 4.4vw, 50px);
  line-height: 1.15;
  letter-spacing: -0.045em;
  margin: 0;
  position: relative;
  z-index: 2;
}
.section-about {
  overflow: hidden;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #fbfdfe 0%, #f2f8fa 100%);
}
.about-watermark {
  position: absolute;
  left: 50%;
  top: 38px;
  transform: translateX(-50%);
  width: min(1100px, 92vw);
  font-family: Impact, "Arial Narrow", sans-serif;
  font-size: clamp(88px, 12vw, 180px);
  line-height: 0.74;
  letter-spacing: -0.03em;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(79, 122, 144, 0.1);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}
.about-watermark span {
  display: block;
}
.about-grid {
  position: relative;
  z-index: 2;
  margin: 65px 0 0 auto;
  max-width: 900px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  color: #5b6d77;
  line-height: 2;
}
.section-network {
  background: #edf5f8;
}
.network-flow {
  margin-top: 70px;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 24px;
  align-items: center;
}
.network-flow article {
  background: #fff;
  border: 1px solid #dce8ed;
  padding: 36px;
  min-height: 220px;
}
.network-flow article b {
  font-size: 11px;
  color: var(--blue);
}
.network-flow h3 {
  font-family: Impact, "Arial Narrow", sans-serif;
  font-size: 50px;
  font-weight: 400;
  margin: 28px 0 10px;
}
.network-flow > span {
  font-size: 30px;
  color: #8ba0aa;
}
.section-headline {
  display: flex;
  justify-content: space-between;
  gap: 50px;
  align-items: end;
}
.section-headline > p {
  max-width: 420px;
  color: #667983;
  line-height: 1.8;
}
.member-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 64px;
}
.member {
  border: 1px solid #dce6ea;
  background: #f8fafb;
  padding: 18px;
  min-height: 260px;
  display: flex;
  flex-direction: column;
}
.member img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000/650;
  object-fit: cover;
  background: #eaf1f3;
}
.member .member-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
  font-family: "Arial Narrow", sans-serif;
  font-size: 9px;
  letter-spacing: 0.14em;
  color: #7d909a;
}
.member h3 {
  font-size: 19px;
  margin: 8px 0 0;
}
.member p {
  font-size: 12px;
  color: #73858f;
}
.cta-section {
  position: relative;
  z-index: 10;
  background: #10212b;
  color: #fff;
  text-align: center;
  padding: 130px 8vw;
}
.cta-section > p {
  font-family: "Arial Narrow", sans-serif;
  letter-spacing: 0.2em;
  color: #76c8ef;
}
.cta-section h2 {
  font-size: clamp(35px, 4vw, 55px);
  line-height: 1.2;
  letter-spacing: -0.04em;
}
.cta-section a {
  display: inline-flex;
  gap: 32px;
  align-items: center;
  margin-top: 32px;
  background: #fff;
  color: #10212b;
  border-radius: 50px;
  padding: 22px 32px;
  font-weight: 800;
}

@media (max-width: 1180px) {
  :root {
    --header-h: 96px;
  }
  .site-head nav {
    gap: 32px;
  }
  .selection {
    grid-template-columns: 100px 1fr 1fr;
    gap: 16px;
    padding: 18px 20px;
  }
  .selection-no strong {
    font-size: 72px;
  }
  .selection-title h1 > span {
    font-size: 34px;
  }
  .selection-actions {
    grid-column: 3;
  }
}

@media (max-width: 900px) {
  .member-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .selection {
    grid-template-columns: 84px 1fr;
    gap: 14px;
  }
  .selection-title h1 > span {
    font-size: 32px;
  }
  .selection-desc {
    grid-column: 1/3;
  }
  .selection-actions {
    grid-column: 1/3;
    justify-self: stretch;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
}

@media (max-width: 720px) {
  :root {
    --header-h: 84px;
  }
  .site-head {
    grid-template-columns: 1fr auto;
    padding: 0 18px;
  }
  .site-head nav {
    display: none;
  }
  .brand strong {
    font-size: 22px;
  }
  .brand span {
    display: none;
  }
  .sound-toggle {
    grid-column: 2;
  }
  .hero {
    min-height: 760px;
    height: 100svh;
  }
  .hero-eyebrow {
    top: 102px;
    font-size: 8px;
    gap: 8px;
  }
  .hero-eyebrow span:nth-of-type(n + 3),
  .hero-eyebrow i:nth-of-type(n + 2) {
    display: none;
  }
  .hero-hint {
    left: 16px;
    top: 48%;
    width: 72px;
    height: 72px;
  }
  .intro-sparks span:after {
    width: 44px;
  }
  .selection-shell {
    left: 12px;
    right: 12px;
    bottom: 12px;
  }
  .selection {
    padding: 12px 12px 10px;
    border-radius: 26px;
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 8px;
  }
  .selection-no strong {
    font-size: 54px;
  }
  .selection-title p {
    font-size: 9px;
  }
  .selection-title h1 > span {
    font-size: 26px;
  }
  .selection-title h1 small {
    font-size: 13px;
  }
  .selection-desc > p:first-child {
    font-size: 13px;
    line-height: 1.65;
  }
  .selection-meta {
    margin-top: 8px !important;
  }
  .selection-actions {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
  }
  .site-link {
    width: auto;
    min-width: 0;
    height: 52px;
    padding: 0 18px;
    font-size: 12px;
  }
  .selection-nav {
    padding: 6px 8px;
  }
  .selection-nav button {
    width: 38px;
    height: 38px;
  }
  .scroll-cue {
    display: none;
  }
  .section {
    padding: 82px 22px;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 40px;
  }
  .network-flow {
    grid-template-columns: 1fr;
  }
  .network-flow > span {
    transform: rotate(90deg);
    justify-self: center;
  }
  .member-grid {
    grid-template-columns: 1fr;
  }
  .section-headline {
    display: block;
  }
  .cta-section {
    padding: 90px 24px;
  }
  .about-watermark {
    top: 56px;
    font-size: 28vw;
    -webkit-text-stroke: 1px rgba(79, 122, 144, 0.08);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ===== v4.5: balanced hero / compact first view ===== */
@media (min-width: 901px) {
  .selection-shell {
    left: 50%;
    right: auto;
    width: min(1160px, 88vw);
    transform: translateX(-50%);
    bottom: 10vh;
  }
  .selection {
    grid-template-columns:
      108px minmax(245px, 0.9fr) minmax(320px, 1.25fr)
      220px;
    gap: 18px;
    padding: 16px 20px;
    border-radius: 28px;
    background: linear-gradient(
      180deg,
      rgba(244, 251, 253, 0.4),
      rgba(238, 249, 252, 0.24)
    );
    border: 1px solid rgba(255, 255, 255, 0.42);
    box-shadow:
      0 14px 44px rgba(34, 72, 91, 0.12),
      0 0 0 1px rgba(192, 224, 235, 0.08) inset;
    backdrop-filter: blur(11px) saturate(1.08);
  }
  .selection:before {
    opacity: 0.48;
  }
  .selection-no strong {
    font-size: 76px;
    color: #17313e;
    text-shadow: none;
    opacity: 0.94;
  }
  .selection-no span {
    color: #496470;
  }
  .selection-title p {
    color: #183540;
  }
  .selection-title h1 > span {
    font-size: 36px;
    color: #17313e;
    text-shadow: none;
  }
  .selection-title h1 small {
    color: #17313e;
  }
  .selection-desc > p:first-child {
    font-size: 13px;
    line-height: 1.65;
    color: #243b46;
  }
  .selection-meta span,
  .selection-meta b {
    color: #385461;
  }
  .site-link {
    height: 62px;
    width: 200px;
    background: rgba(255, 255, 255, 0.78);
    box-shadow: 0 10px 26px rgba(45, 78, 92, 0.11);
  }
  .selection-nav {
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.52);
  }
  .selection-nav button {
    width: 40px;
    height: 40px;
    font-size: 24px;
  }
  .selection-actions {
    gap: 8px;
  }
  .scroll-cue {
    bottom: 10vh;
    right: calc((100vw - min(1160px, 88vw)) / 2 - 32px);
  }
}

@media (max-width: 900px) and (min-width: 721px) {
  .selection-shell {
    bottom: 30px;
  }
  .selection {
    background: linear-gradient(
      180deg,
      rgba(244, 251, 253, 0.43),
      rgba(238, 249, 252, 0.26)
    );
    backdrop-filter: blur(10px);
  }
  .selection-no strong,
  .selection-title h1 > span {
    color: #17313e;
    text-shadow: none;
  }
  .selection-no span,
  .selection-title h1 small,
  .selection-desc > p:first-child {
    color: #243b46;
  }
}

@media (max-width: 720px) {
  .selection-shell {
    bottom: 10px;
  }
  .selection {
    background: linear-gradient(
      180deg,
      rgba(244, 251, 253, 0.46),
      rgba(238, 249, 252, 0.28)
    );
    border-color: rgba(255, 255, 255, 0.38);
    backdrop-filter: blur(10px) saturate(1.06);
    box-shadow: 0 10px 30px rgba(35, 72, 90, 0.1);
  }
  .selection-no strong {
    color: #17313e;
    text-shadow: none;
    opacity: 0.95;
  }
  .selection-no span {
    color: #496470;
  }
  .selection-title p {
    color: #183540;
  }
  .selection-title h1 > span {
    color: #17313e;
    text-shadow: none;
  }
  .selection-title h1 small {
    color: #17313e;
  }
  .selection-desc > p:first-child {
    color: #243b46;
  }
  .selection-meta span,
  .selection-meta b {
    color: #385461;
  }
  .site-link {
    background: rgba(255, 255, 255, 0.76);
  }
  .selection-nav {
    background: rgba(255, 255, 255, 0.52);
  }
}

/* ===== v4.6: hub above header / taller cylinder / true one-screen hero ===== */
/* Three.js のHubをヘッダー帯より手前へ。canvas自体はpointer-events:noneなのでナビ操作は妨げない。 */
#gl {
  z-index: 21;
}
.site-head {
  z-index: 20;
}
.hero-hint {
  z-index: 25;
}
.intro-sparks {
  z-index: 23;
}
.selection-shell {
  z-index: 26;
}
.scroll-cue {
  z-index: 27;
}

/* 860px固定が低いPC画面で説明パネルをファーストビュー外へ押し出していたため解除。 */
@media (min-width: 721px) {
  .hero {
    height: 100svh;
    min-height: 680px;
  }
}

/* PCでは反射の上に説明パネルを重ね、上下の空白を作らない。 */
@media (min-width: 901px) {
  .selection-shell {
    bottom: 16px;
    width: min(1180px, 90vw);
  }
  .selection {
    padding: 14px 20px;
    grid-template-columns:
      100px minmax(235px, 0.88fr) minmax(310px, 1.2fr)
      210px;
    min-height: 128px;
  }
  .selection-no strong {
    font-size: 70px;
  }
  .selection-title h1 > span {
    font-size: 34px;
  }
  .selection-desc > p:first-child {
    font-size: 14px;
    line-height: 1.58;
  }
  .site-link {
    height: 58px;
    width: 194px;
  }
  .selection-nav button {
    width: 38px;
    height: 38px;
  }
  .scroll-cue {
    bottom: 16px;
  }
}

/* タブレットも1画面内を優先 */
@media (max-width: 900px) and (min-width: 721px) {
  .hero {
    height: 100svh;
    min-height: 680px;
  }
  .selection-shell {
    bottom: 12px;
  }
  .selection {
    padding: 12px 16px;
  }
}

/* スマホも過大な最低高さを持たせない。 */
@media (max-width: 720px) {
  .hero {
    height: 100svh;
    min-height: 640px;
  }
  .selection-shell {
    bottom: max(8px, env(safe-area-inset-bottom));
  }
}

/* ===== v4.7: vertical-axis cylinder + raised controls ===== */
/*
 * 円柱の横幅・リング半径はJS側で維持。
 * Hのみ縦方向へ伸ばし、カメラが後退して相殺しないようにした版。
 */
@media (min-width: 901px) {
  .hero-hint {
    top: 43%;
    left: 4.2vw;
  }
  .selection-shell {
    bottom: clamp(54px, 7vh, 74px);
  }
  .scroll-cue {
    bottom: clamp(54px, 7vh, 74px);
  }
}

@media (max-width: 900px) and (min-width: 721px) {
  .hero-hint {
    top: 44%;
  }
  .selection-shell {
    bottom: 34px;
  }
}

@media (max-width: 720px) {
  .hero-hint {
    top: 42%;
  }
  .selection-shell {
    bottom: max(18px, env(safe-area-inset-bottom));
  }
}

/* ===== v4.9: larger ring / raised first-view info panel ===== */
@media (min-width: 901px) {
  .selection-shell {
    bottom: clamp(122px, 15.5vh, 176px);
  }
  .scroll-cue {
    bottom: clamp(124px, 15.2vh, 174px);
  }
  .hero-hint {
    top: 50%;
  }
}

@media (max-width: 900px) {
  .selection-shell {
    bottom: max(26px, calc(env(safe-area-inset-bottom) + 18px));
  }
  .hero-hint {
    top: 45%;
  }
}

/* ===== v5.0: larger cards, narrower side gaps, drag hint lifted ===== */
@media (min-width: 901px) {
  .hero-hint {
    top: 42%;
    left: 4.2vw;
  }
}

@media (max-width: 900px) and (min-width: 721px) {
  .hero-hint {
    top: 39%;
    left: 16px;
  }
}

@media (max-width: 720px) {
  .hero-hint {
    top: 37%;
    left: 14px;
  }
}

/* ===== v5.1: network member list counts ===== */
/* PC / tablet はJS側で8カードだけ生成。スマホは先頭5カードだけ表示。 */
@media (max-width: 720px) {
  .member-grid .member:nth-child(n + 6) {
    display: none;
  }
}

/* ===== v5.2: mobile first view closer to reference layout ===== */
@media (max-width: 720px) {
  .hero {
    height: 100svh;
    min-height: 100svh;
  }

  /* スマホでは上部の余白を減らし、土星を大きく見せる */
  .hero-hint {
    top: 36%;
    left: 14px;
    width: 70px;
    height: 70px;
    z-index: 28;
  }

  .selection-shell {
    left: 10px;
    right: 10px;
    bottom: max(12px, calc(env(safe-area-inset-bottom) + 6px));
  }

  .selection {
    grid-template-columns: 58px 1fr;
    gap: 10px;
    padding: 14px 14px 12px;
    border-radius: 24px;
    background: linear-gradient(
      180deg,
      rgba(245, 252, 254, 0.88),
      rgba(236, 248, 252, 0.82)
    );
    box-shadow: 0 12px 34px rgba(35, 72, 90, 0.12);
  }

  .selection-no strong {
    font-size: 52px;
    line-height: 0.86;
  }

  .selection-title p {
    font-size: 8px;
    letter-spacing: 0.13em;
  }

  .selection-title h1 > span {
    font-size: 22px;
    line-height: 0.95;
  }

  .selection-title h1 small {
    font-size: 12px;
    margin-top: 6px;
  }

  .selection-desc > p:first-child {
    font-size: 13px;
    line-height: 1.58;
  }

  .selection-meta {
    gap: 10px;
    font-size: 9px !important;
  }

  .selection-actions {
    margin-top: 2px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    align-items: center;
  }

  .site-link {
    height: 48px;
    padding: 0 16px;
    font-size: 12px;
  }

  .site-link b {
    font-size: 20px;
  }

  .selection-nav {
    padding: 6px 8px;
  }

  .selection-nav span {
    min-width: 68px;
    font-size: 12px;
  }
}

/* ===== v5.3: smartphone = focused single-card hero ===== */
@media (max-width: 720px) {
  .hero {
    height: 100svh;
    min-height: 100svh;
  }

  /* The 3D stage uses the upper ~62% of the screen; no giant empty lake gap. */
  .hero:before {
    background:
      radial-gradient(
        90% 24% at 50% 43%,
        rgba(255, 255, 255, 0.58) 0,
        rgba(255, 255, 255, 0.16) 46%,
        rgba(255, 255, 255, 0) 78%
      ),
      linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.5) 0,
        rgba(255, 255, 255, 0) 11%,
        rgba(255, 255, 255, 0) 89%,
        rgba(255, 255, 255, 0.4) 100%
      );
  }

  .hero-ripples {
    mask-image: linear-gradient(
      180deg,
      transparent 0 35%,
      rgba(0, 0, 0, 0.95) 45%,
      rgba(0, 0, 0, 0.98) 78%,
      rgba(0, 0, 0, 0.12) 91%,
      transparent 100%
    );
  }

  .hero-hint {
    width: 58px;
    height: 58px;
    left: 10px;
    top: 42%;
    font-size: 9px;
    box-shadow: 0 10px 30px rgba(61, 101, 120, 0.12);
  }
  .hero-hint b {
    font-size: 9px;
  }
  .hero-hint span {
    font-size: 6px;
    margin-top: 2px;
  }

  /* Reference-style: details are directly under the large selected card/reflection. */
  .selection-shell {
    left: 10px;
    right: 10px;
    bottom: max(8px, calc(env(safe-area-inset-bottom) + 4px));
  }

  .selection {
    grid-template-columns: 52px 1fr;
    gap: 7px 10px;
    padding: 11px 12px 10px;
    min-height: 0;
    border-radius: 20px;
    background: linear-gradient(
      180deg,
      rgba(244, 251, 253, 0.88),
      rgba(235, 247, 251, 0.82)
    );
    backdrop-filter: blur(12px) saturate(1.08);
  }

  .selection-no span {
    font-size: 7px;
  }
  .selection-no strong {
    font-size: 45px;
    line-height: 0.84;
  }
  .selection-title p {
    font-size: 7px;
    margin-bottom: 4px;
    white-space: nowrap;
  }
  .selection-title p:before {
    margin-right: 6px;
    font-size: 6px;
  }
  .selection-title h1 > span {
    font-size: 21px;
    line-height: 0.95;
  }
  .selection-title h1 small {
    font-size: 11px;
    margin-top: 4px;
  }

  .selection-desc {
    grid-column: 1/3;
  }
  .selection-desc > p:first-child {
    font-size: 13px;
    line-height: 1.46;
    margin-top: 1px;
  }
  .selection-meta {
    margin-top: 5px !important;
    font-size: 7px !important;
    gap: 8px;
  }

  .selection-actions {
    grid-column: 1/3;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 7px;
    margin-top: 1px;
  }
  .site-link {
    height: 44px;
    border-radius: 24px;
    padding: 0 14px;
    font-size: 11px;
  }
  .site-link b {
    font-size: 17px;
  }
  .selection-nav {
    gap: 5px;
    padding: 4px 6px;
  }
  .selection-nav button {
    width: 34px;
    height: 34px;
    font-size: 21px;
  }
  .selection-nav span {
    min-width: 62px;
    font-size: 10px;
  }
}

/* ===== v5.4: mobile tilted ring / edge navigation / tighter vertical composition ===== */
.mobile-ring-arrow {
  display: none;
}

@media (max-width: 720px) {
  /* Smartphone no longer uses the desktop DRAG badge. */
  .hero-hint {
    display: none !important;
  }

  /* The front card is now intentionally lower and rear cards rise in WebGL.
     Pull the details panel upward so the reflection does not become dead space. */
  .selection-shell {
    bottom: max(24px, calc(env(safe-area-inset-bottom) + 12px));
  }

  /* Tap targets at both sides of the focused card make rotation discoverable. */
  .mobile-ring-arrow {
    display: grid;
    place-items: center;
    position: absolute;
    z-index: 29;
    top: 49%;
    transform: translateY(-50%);
    width: 44px;
    height: 54px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.62);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(10px) saturate(1.08);
    box-shadow: 0 10px 28px rgba(38, 78, 96, 0.13);
    color: #16333f;
    font-family: system-ui, sans-serif;
    font-size: 27px;
    line-height: 1;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }
  .mobile-ring-arrow:active {
    transform: translateY(-50%) scale(0.94);
  }
  .mobile-ring-arrow-prev {
    left: 8px;
  }
  .mobile-ring-arrow-next {
    right: 8px;
  }

  /* Keep the text panel compact enough to stay in the first view. */
  .selection {
    padding-top: 10px;
    padding-bottom: 9px;
  }
  .selection-desc > p:first-child {
    line-height: 1.42;
  }
  .selection-actions {
    margin-top: 0;
  }
}

/* ===== v5.5: stable mobile spacing / subtle nav / lighter touch spin ===== */
@media (max-width: 720px) {
  /* A deliberate but compact breathing space between reflected card and detail panel. */
  .selection-shell {
    bottom: max(16px, calc(env(safe-area-inset-bottom) + 8px));
  }

  /* Side navigation is only a quiet affordance; the card remains the visual subject. */
  .mobile-ring-arrow {
    top: 48.5%;
    width: 27px;
    height: 34px;
    border-radius: 15px;
    border: 1px solid rgba(40, 82, 100, 0.14);
    background: rgba(246, 252, 254, 0.38);
    backdrop-filter: blur(7px);
    box-shadow: 0 5px 14px rgba(40, 78, 96, 0.07);
    color: rgba(22, 51, 63, 0.58);
    font-size: 18px;
    font-weight: 400;
    opacity: var(--mobile-ring-nav-opacity, 0.62);
    transition:
      opacity 0.22s ease,
      background 0.18s ease,
      transform 0.15s ease;
  }
  .mobile-ring-arrow-prev {
    left: 6px;
  }
  .mobile-ring-arrow-next {
    right: 6px;
  }
  .mobile-ring-arrow:active {
    background: rgba(255, 255, 255, 0.62);
    transform: translateY(-50%) scale(0.94);
  }
  .mobile-ring-nav-hidden .mobile-ring-arrow {
    pointer-events: none;
    opacity: 0;
  }

  /* Horizontal gestures rotate the carousel; vertical gestures remain page scrolling. */
  .hero {
    touch-action: pan-y pinch-zoom;
  }
}

/* ===== v6.0: Japanese navigation / clickable drag / image effect cards ===== */
.hero-hint {
  padding: 0;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  color: inherit;
}
.hero-hint:hover {
  transform: translateY(-3px) scale(1.025);
  box-shadow: 0 20px 54px rgba(61, 101, 120, 0.18);
}
.hero-hint:active {
  transform: translateY(1px) scale(0.97);
}
.hero-hint:focus-visible {
  outline: 2px solid rgba(26, 160, 224, 0.62);
  outline-offset: 4px;
}

.network-flow-images article {
  padding: 0;
  min-height: 0;
  overflow: hidden;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 18px 48px rgba(51, 86, 102, 0.12);
}
.network-flow-images article img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16/10;
  object-fit: cover;
}

@media (max-width: 720px) {
  .network-flow-images article {
    border-radius: 14px;
  }
}

/* ===== v6.2: lower PC info panel / remove scroll cue ===== */
.scroll-cue {
  display: none !important;
}

@media (min-width: 901px) {
  /* v4.9 で上げ過ぎていた情報パネルを、円環の反射を残しつつ自然な位置へ下げる。 */
  .selection-shell {
    bottom: clamp(64px, 8vh, 88px);
  }
}

/* ===== v6.3: tropical clear-aqua hero ===== */
.hero-scenery:after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(
      70% 24% at 50% 48%,
      rgba(225, 255, 255, 0.3),
      rgba(225, 255, 255, 0) 72%
    ),
    linear-gradient(
      90deg,
      rgba(111, 231, 242, 0.08),
      rgba(255, 255, 255, 0.04) 48%,
      rgba(75, 215, 235, 0.08)
    );
  mix-blend-mode: screen;
}
#selEn[hidden] {
  display: none !important;
}

/* ===== v6.5: contextual resource links / footer navigation ===== */
.resource-bridge,
.manual-bridge {
  position: relative;
  z-index: 10;
}

.resource-bridge {
  overflow: hidden;
  margin: 0;
  padding: 72px 8vw;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: center;
  background:
    radial-gradient(
      circle at 86% 18%,
      rgba(94, 209, 255, 0.18),
      transparent 34%
    ),
    linear-gradient(
      135deg,
      rgba(250, 253, 254, 0.98),
      rgba(239, 249, 253, 0.94)
    );
  border-top: 1px solid rgba(89, 139, 162, 0.12);
  border-bottom: 1px solid rgba(89, 139, 162, 0.14);
}
.resource-bridge:before {
  content: "";
  position: absolute;
  inset: 20px 5vw;
  border: 1px solid rgba(89, 139, 162, 0.14);
  border-radius: 34px;
  pointer-events: none;
}
.resource-bridge-mark {
  position: absolute;
  right: 5vw;
  top: 50%;
  transform: translateY(-52%);
  font-family: Impact, "Arial Narrow", sans-serif;
  font-size: clamp(110px, 16vw, 250px);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(69, 123, 148, 0.09);
  user-select: none;
  pointer-events: none;
}
.resource-bridge-copy {
  position: relative;
  z-index: 2;
  max-width: 850px;
}
.resource-bridge-kicker {
  margin: 0 0 14px;
  font-family: "Arial Narrow", sans-serif;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.22em;
  color: #1aa0e0;
}
.resource-bridge h3 {
  margin: 0;
  font-size: clamp(30px, 4vw, 58px);
  line-height: 1.2;
  letter-spacing: -0.04em;
}
.resource-bridge-copy > p:last-child {
  margin: 24px 0 0;
  color: #5e747f;
  line-height: 1.9;
  font-size: 14px;
}
.resource-bridge-link,
.manual-bridge-link {
  position: relative;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
  min-width: 210px;
  height: 74px;
  padding: 0 28px;
  border-radius: 999px;
  border: 1px solid rgba(91, 132, 151, 0.2);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 18px 50px rgba(47, 92, 112, 0.12);
  font-weight: 800;
  backdrop-filter: blur(16px);
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    background 0.22s ease;
}
.resource-bridge-link:hover,
.manual-bridge-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 56px rgba(47, 92, 112, 0.17);
  background: #fff;
}
.resource-bridge-link b,
.manual-bridge-link b {
  font-size: 22px;
  font-weight: 500;
}

.manual-bridge {
  margin: 0;
  padding: 38px 8vw;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  background: linear-gradient(180deg, #edf5f8 0%, #f8fbfc 100%);
  border-bottom: 1px solid rgba(89, 139, 162, 0.13);
}
.manual-bridge-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(91, 132, 151, 0.18);
  box-shadow: 0 12px 34px rgba(47, 92, 112, 0.09);
  color: #1aa0e0;
  font-family: Georgia, serif;
  font-size: 28px;
  font-weight: 700;
}
.manual-bridge-copy p {
  margin: 0 0 6px;
  color: #69808b;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}
.manual-bridge-copy h3 {
  margin: 0;
  font-size: clamp(18px, 2vw, 27px);
  line-height: 1.55;
  letter-spacing: -0.025em;
}
.manual-bridge-link {
  height: 62px;
  min-width: 280px;
  font-size: 13px;
}

.site-footer {
  position: relative;
  z-index: 10;
  padding: 46px 6vw 42px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 54px;
  align-items: center;
  background: #0b1820;
  color: #dce9ef;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.site-footer-brand a {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.site-footer-brand strong {
  font-size: 21px;
  color: #fff;
}
.site-footer-brand span,
.site-footer-brand p,
.site-footer-note {
  font-family: "Arial Narrow", sans-serif;
  letter-spacing: 0.16em;
  font-size: 10px;
  color: #cedfe8;
}
.site-footer-brand p {
  margin: 8px 0 0;
}
.site-footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 26px;
}
.site-footer-nav a {
  position: relative;
  font-size: 11px;
  font-weight: 700;
  color: #b9cbd4;
  transition: color 0.2s ease;
}
.site-footer-nav a:hover {
  color: #fff;
}
.site-footer-nav a:after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -5px;
  height: 1px;
  background: #67caf5;
  transition: right 0.2s ease;
}
.site-footer-nav a:hover:after {
  right: 0;
}
.site-footer-note {
  margin: 0;
  white-space: nowrap;
  text-align: right;
}

@media (max-width: 900px) {
  .resource-bridge {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 64px 7vw;
  }
  .resource-bridge:before {
    inset: 16px 4vw;
  }
  .resource-bridge-mark {
    right: -2vw;
    top: 34%;
    font-size: 28vw;
  }
  .resource-bridge-link {
    justify-self: start;
    height: 64px;
  }
  .manual-bridge {
    grid-template-columns: auto 1fr;
    padding: 34px 7vw;
  }
  .manual-bridge-link {
    grid-column: 1/3;
    justify-self: start;
  }
  .site-footer {
    grid-template-columns: 1fr;
    gap: 28px;
    text-align: center;
  }
  .site-footer-brand a {
    justify-content: center;
  }
  .site-footer-nav {
    justify-content: center;
  }
  .site-footer-note {
    text-align: center;
  }
}

@media (max-width: 720px) {
  .resource-bridge {
    padding: 58px 22px;
  }
  .resource-bridge:before {
    inset: 12px;
    border-radius: 26px;
  }
  .resource-bridge-kicker {
    font-size: 9px;
  }
  .resource-bridge h3 {
    font-size: 30px;
  }
  .resource-bridge-copy > p:last-child {
    font-size: 13px;
    line-height: 1.8;
  }
  .resource-bridge-link {
    width: 100%;
    min-width: 0;
    height: 60px;
    padding: 0 22px;
  }
  .manual-bridge {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 34px 22px 40px;
  }
  .manual-bridge-icon {
    width: 48px;
    height: 48px;
    font-size: 24px;
  }
  .manual-bridge-link {
    grid-column: auto;
    width: 100%;
    min-width: 0;
    height: 58px;
    padding: 0 20px;
  }
  .site-footer {
    padding: 42px 22px 36px;
  }
  .site-footer-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px 20px;
  }
}

/* ===== v6.8: remove OWNER bridge / compact manual guidance ===== */
/* PCでは「特徴」の画像群とマニュアル案内の間の空白を詰める。 */
@media (min-width: 901px) {
  .section-network {
    padding-bottom: 40px;
  }
  .manual-bridge {
    padding: 22px 8vw 24px;
    gap: 22px;
  }
  .manual-bridge-icon {
    width: 46px;
    height: 46px;
    font-size: 22px;
  }
  .manual-bridge-copy p {
    margin-bottom: 4px;
    font-size: 8px;
    letter-spacing: 0.07em;
  }
  .manual-bridge-copy h3 {
    font-size: clamp(14px, 1.25vw, 18px);
    line-height: 1.48;
    letter-spacing: -0.015em;
  }
  .manual-bridge-link {
    height: 56px;
    min-width: 260px;
    font-size: 12px;
  }
}

/* タブレット・スマホでも案内文は控えめなサイズに統一。 */
@media (max-width: 900px) {
  .section-network {
    padding-bottom: 42px;
  }
  .manual-bridge-copy p {
    font-size: 8px;
  }
  .manual-bridge-copy h3 {
    font-size: 16px;
    line-height: 1.5;
  }
}

@media (max-width: 720px) {
  .manual-bridge {
    padding-top: 24px;
  }
  .manual-bridge-copy h3 {
    font-size: 15px;
  }
}

/* ===== v6.9.3: mobile description cap / extra ring clearance ===== */
@media (max-width: 720px) {
  /*
   * 案内文が長い場合でも4行を上限にして、
   * 情報パネルが上方向へ伸び過ぎないようにする。
   */
  .selection-desc > p:first-child {
    line-height: 1.42;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    overflow: hidden;
    max-height: calc(1.42em * 4);
  }

  /*
   * Three.js側で円環を従来より15px上げるため、
   * 左右の回転ボタンも同じだけ上へ合わせる。
   */
  .mobile-ring-arrow {
    top: calc(48.5% - 15px);
  }
}

/* ===== v6.9.4: vonnect.jpg inspired clear sky-blue hero palette ===== */
/*
 * ファーストビューを、ターコイズ寄りの海色から
 * vonnect.jpg に近い「空色・水色・白」中心の透明感ある色調へ。
 * レイアウト・サイズ・アニメーション挙動は変更しない。
 */

/* ヘッダーも背景と自然につながる淡いスカイブルーへ。 */
.site-head {
  background: rgba(232, 248, 254, 0.42);
  border-bottom-color: rgba(62, 145, 184, 0.08);
  backdrop-filter: blur(18px) saturate(1.05);
}

/* ベース背景：緑味を抑え、明るいスカイブルーを主役にする。 */
.hero {
  background:
    radial-gradient(
      ellipse at 50% 35%,
      rgba(255, 255, 255, 0.76) 0%,
      rgba(244, 252, 255, 0.56) 25%,
      rgba(235, 249, 255, 0.24) 43%,
      rgba(255, 255, 255, 0) 62%
    ),
    linear-gradient(
      180deg,
      #b9e8fa 0%,
      #a5e2fa 12%,
      #91ddf9 25%,
      #7fd6f6 38%,
      #70cff1 51%,
      #79d3f2 63%,
      #96def6 76%,
      #b9eaf9 88%,
      #e1f7fd 100%
    );
}

/* 黄味のある発光をやめ、vonnect.jpg の白～水色の光へ統一。 */
.hero-sun {
  background: radial-gradient(
    circle at 50% 17%,
    rgba(255, 255, 255, 0.96) 0 7%,
    rgba(238, 250, 255, 0.72) 13%,
    rgba(191, 232, 250, 0.34) 22%,
    rgba(141, 214, 246, 0.12) 31%,
    rgba(255, 255, 255, 0) 43%
  );
}

/* 暗い青緑の雲影を弱め、淡い青の空気感へ。 */
.hero-cloud {
  filter: blur(8px);
}
.hero-cloud-a {
  background:
    radial-gradient(
      36% 11% at 17% 39%,
      rgba(89, 187, 228, 0.10) 0 53%,
      rgba(89, 187, 228, 0) 55%
    ),
    radial-gradient(
      42% 11% at 82% 40%,
      rgba(75, 174, 219, 0.09) 0 53%,
      rgba(75, 174, 219, 0) 55%
    );
}
.hero-cloud-b {
  background:
    radial-gradient(
      21% 6% at 50% 42%,
      rgba(255, 255, 255, 0.90) 0 55%,
      rgba(255, 255, 255, 0) 58%
    ),
    radial-gradient(
      43% 11% at 51% 46%,
      rgba(237, 250, 255, 0.55) 0 52%,
      rgba(237, 250, 255, 0) 57%
    );
}

/* 中央カード周辺を白く、外側を淡いブルーに見せる霞。 */
.hero-haze {
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0) 0 38%,
      rgba(239, 252, 255, 0.33) 47%,
      rgba(219, 245, 255, 0.17) 59%,
      rgba(255, 255, 255, 0) 72%
    ),
    radial-gradient(
      72% 18% at 50% 55%,
      rgba(249, 254, 255, 0.62) 0,
      rgba(229, 248, 255, 0.27) 40%,
      rgba(255, 255, 255, 0) 72%
    );
}

/* 水面は残しつつ、現在の横線の主張を少し抑える。 */
.hero-ripples {
  background:
    linear-gradient(
      180deg,
      rgba(255, 255, 255, 0) 0 48%,
      rgba(255, 255, 255, 0.12) 51%,
      rgba(255, 255, 255, 0) 54%
    ),
    repeating-linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.14) 0 2px,
      rgba(255, 255, 255, 0) 2px 15px
    ),
    radial-gradient(
      125% 58% at 50% 70%,
      rgba(246, 253, 255, 0.27) 0,
      rgba(218, 245, 255, 0.12) 43%,
      rgba(255, 255, 255, 0) 69%
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0) 0 12%,
      rgba(230, 248, 255, 0.08) 24%,
      rgba(255, 255, 255, 0) 36%,
      rgba(230, 248, 255, 0.08) 58%,
      rgba(255, 255, 255, 0) 70%,
      rgba(230, 248, 255, 0.08) 84%,
      rgba(255, 255, 255, 0) 100%
    );
  opacity: 0.56;
}

/* 画面中央を vonnect.jpg のように柔らかく白く持ち上げる。 */
.hero:before {
  background:
    radial-gradient(
      80% 31% at 50% 52%,
      rgba(255, 255, 255, 0.68) 0,
      rgba(245, 253, 255, 0.34) 38%,
      rgba(223, 247, 255, 0.12) 60%,
      rgba(255, 255, 255, 0) 80%
    ),
    linear-gradient(
      90deg,
      rgba(220, 245, 255, 0.31) 0,
      rgba(255, 255, 255, 0.08) 15%,
      rgba(255, 255, 255, 0) 38%,
      rgba(255, 255, 255, 0) 62%,
      rgba(255, 255, 255, 0.08) 85%,
      rgba(220, 245, 255, 0.30) 100%
    );
}

/* v6.3 の追加オーバーレイも、緑味のないスカイブルーへ。 */
.hero-scenery:after {
  background:
    radial-gradient(
      72% 27% at 50% 47%,
      rgba(232, 250, 255, 0.40),
      rgba(232, 250, 255, 0) 72%
    ),
    linear-gradient(
      90deg,
      rgba(111, 209, 244, 0.09),
      rgba(255, 255, 255, 0.06) 48%,
      rgba(97, 202, 240, 0.10)
    );
  opacity: 0.72;
}

/*
 * Three.js のカード・Hubは画像本来の色を壊さない程度に、
 * 少しだけ明るく・淡くして背景との一体感を出す。
 */
#gl {
  filter: brightness(1.035) saturate(0.93) contrast(0.975);
}

/* vonnect.jpg はノイズ感が少ないため、粒子テクスチャを控えめに。 */
.grain {
  opacity: 0.035;
}

/* ガラスパネル類も背景に合わせて、やや青白く軽い質感へ。 */
.selection {
  background: linear-gradient(
    180deg,
    rgba(247, 253, 255, 0.84) 0%,
    rgba(233, 248, 254, 0.72) 100%
  );
  border-color: rgba(255, 255, 255, 0.68);
}

.site-link {
  background: rgba(250, 254, 255, 0.90);
}

.selection-nav {
  background: rgba(247, 253, 255, 0.68);
}

/* スマホでも同じ冷色系の発光に統一。 */
@media (max-width: 720px) {
  .hero-sun {
    background: radial-gradient(
      circle at 50% 17%,
      rgba(255, 255, 255, 0.96) 0 7%,
      rgba(238, 250, 255, 0.72) 13%,
      rgba(191, 232, 250, 0.34) 22%,
      rgba(141, 214, 246, 0.12) 31%,
      rgba(255, 255, 255, 0) 43%
    );
  }

  .selection {
    background: linear-gradient(
      180deg,
      rgba(247, 253, 255, 0.90),
      rgba(232, 247, 253, 0.84)
    );
  }
}

/* ===== v6.9.6: Three.js blue-shadow coordination ===== */
/*
 * 中央の接地影は main.js 側で直接ブルー系へ変更したため、
 * CSSでは上から疑似発光を重ねず、WebGL本来の立体感をそのまま見せる。
 */
#gl {
  filter: brightness(1.04) saturate(0.95) contrast(0.985);
}

/* ===== v6.9.7: luminous water depth / blue edge framing ===== */
/*
 * Three.js側の「青白い光だまり・水紋」と組み合わせ、
 * 黒いビネットを使わずに左右だけ少し深いブルーへ。
 * 中央は明るいまま維持する。
 */
.hero:before {
  background:
    radial-gradient(
      80% 31% at 50% 52%,
      rgba(255, 255, 255, 0.70) 0,
      rgba(245, 253, 255, 0.36) 38%,
      rgba(223, 247, 255, 0.12) 60%,
      rgba(255, 255, 255, 0) 80%
    ),
    linear-gradient(
      90deg,
      rgba(71, 181, 226, 0.13) 0%,
      rgba(139, 215, 244, 0.07) 12%,
      rgba(255, 255, 255, 0.02) 27%,
      rgba(255, 255, 255, 0) 40%,
      rgba(255, 255, 255, 0) 60%,
      rgba(255, 255, 255, 0.02) 73%,
      rgba(139, 215, 244, 0.07) 88%,
      rgba(71, 181, 226, 0.13) 100%
    );
}

.hero-ripples {
  opacity: 0.61;
}

/* WebGLの色は保ちながら、生成画像のような明るい透明感を維持。 */
#gl {
  filter: brightness(1.045) saturate(0.97) contrast(0.99);
}

@media (max-width: 720px) {
  .hero:before {
    background:
      radial-gradient(
        94% 27% at 50% 43%,
        rgba(255, 255, 255, 0.68) 0,
        rgba(244, 253, 255, 0.30) 42%,
        rgba(255, 255, 255, 0) 78%
      ),
      linear-gradient(
        90deg,
        rgba(71, 181, 226, 0.10) 0%,
        rgba(255, 255, 255, 0) 24%,
        rgba(255, 255, 255, 0) 76%,
        rgba(71, 181, 226, 0.10) 100%
      );
  }
}

/* ===== v6.9.8: stronger blue depth / clearer tonal contrast ===== */
/*
 * ファーストビューの「全体が同じ明るさ」に見える状態を改善。
 * 中央は明るく、上・左右・下へ向かうほどブルーを一段深くして
 * 水面と円環の立体感を強める。
 * レイアウトやThree.jsの位置・サイズは変更しない。
 */

/* ベース背景の濃淡をはっきりさせる */
.hero {
  background:
    radial-gradient(
      ellipse at 50% 38%,
      rgba(255,255,255,0.92) 0%,
      rgba(244,252,255,0.74) 22%,
      rgba(220,245,255,0.34) 40%,
      rgba(255,255,255,0) 62%
    ),
    linear-gradient(
      180deg,
      #8fd5f3 0%,
      #9fe0f7 12%,
      #b7ebfb 24%,
      #8ad7f1 38%,
      #5fc3e8 52%,
      #54bce2 64%,
      #6cc7e7 76%,
      #8fdaf2 88%,
      #b9eafb 100%
    );
}

/* 中央を白く持ち上げ、左右端に明確な青の深みを出す */
.hero:before {
  background:
    radial-gradient(
      72% 30% at 50% 50%,
      rgba(255,255,255,0.88) 0%,
      rgba(245,253,255,0.52) 32%,
      rgba(225,247,255,0.18) 54%,
      rgba(255,255,255,0) 74%
    ),
    linear-gradient(
      90deg,
      rgba(36,145,196,0.28) 0%,
      rgba(71,177,220,0.18) 9%,
      rgba(154,223,247,0.06) 22%,
      rgba(255,255,255,0) 38%,
      rgba(255,255,255,0) 62%,
      rgba(154,223,247,0.06) 78%,
      rgba(71,177,220,0.18) 91%,
      rgba(36,145,196,0.28) 100%
    ),
    linear-gradient(
      180deg,
      rgba(58,163,208,0.10) 0%,
      rgba(255,255,255,0) 34%,
      rgba(255,255,255,0) 60%,
      rgba(43,151,198,0.18) 100%
    );
}

/* 中央の霞を明るく、周辺とのコントラストを強める */
.hero-haze {
  background:
    linear-gradient(
      180deg,
      rgba(255,255,255,0) 0 34%,
      rgba(246,253,255,0.46) 45%,
      rgba(222,246,255,0.20) 58%,
      rgba(255,255,255,0) 74%
    ),
    radial-gradient(
      64% 17% at 50% 54%,
      rgba(255,255,255,0.78) 0%,
      rgba(231,249,255,0.30) 42%,
      rgba(255,255,255,0) 74%
    );
}

/* 水面の横方向のニュアンスを少し強める */
.hero-ripples {
  opacity: 0.72;
  filter: saturate(1.08) contrast(1.05);
}

/* 背景の空気感にも少し青の深みを足す */
.hero-scenery:after {
  background:
    radial-gradient(
      68% 26% at 50% 46%,
      rgba(241,252,255,0.52) 0%,
      rgba(210,242,254,0.20) 42%,
      rgba(255,255,255,0) 72%
    ),
    linear-gradient(
      90deg,
      rgba(43,166,216,0.18) 0%,
      rgba(111,210,241,0.08) 18%,
      rgba(255,255,255,0.04) 50%,
      rgba(111,210,241,0.08) 82%,
      rgba(43,166,216,0.18) 100%
    );
  opacity: 0.92;
}

/* 3Dカードの鮮明さは保ちつつ、背景とのメリハリを少し強める */
#gl {
  filter: brightness(1.03) saturate(1.02) contrast(1.03);
}

/* ヘッダーもほんの少し青くして画面上部の締まりを出す */
.site-head {
  background: rgba(219,242,251,0.48);
  border-bottom-color: rgba(61,151,191,0.14);
}

/* 案内パネルは背景と分離するため白さを少し強める */
.selection {
  background: linear-gradient(
    180deg,
    rgba(251,254,255,0.91) 0%,
    rgba(231,247,253,0.82) 100%
  );
  box-shadow:
    0 18px 52px rgba(45,125,158,0.15),
    0 0 0 1px rgba(188,227,241,0.22) inset;
}

/* スマホでも同じ「中央明・周辺濃」の方向性を維持 */
@media (max-width: 720px) {
  .hero {
    background:
      radial-gradient(
        ellipse at 50% 34%,
        rgba(255,255,255,0.90) 0%,
        rgba(241,251,255,0.68) 24%,
        rgba(215,243,254,0.30) 44%,
        rgba(255,255,255,0) 66%
      ),
      linear-gradient(
        180deg,
        #96dbf6 0%,
        #a6e3f8 16%,
        #8bd8f1 34%,
        #61c4e7 52%,
        #56bde1 67%,
        #77cdea 82%,
        #b6e9f9 100%
      );
  }

  .hero:before {
    background:
      radial-gradient(
        92% 27% at 50% 42%,
        rgba(255,255,255,0.82) 0%,
        rgba(241,252,255,0.42) 42%,
        rgba(255,255,255,0) 76%
      ),
      linear-gradient(
        90deg,
        rgba(36,145,196,0.18) 0%,
        rgba(255,255,255,0) 26%,
        rgba(255,255,255,0) 74%,
        rgba(36,145,196,0.18) 100%
      );
  }
}

/* ===== v6.9.9: raise desktop selection panel by 20px ===== */
/*
 * PC表示だけ、ファーストビュー下部の案内枠全体を20px上へ移動。
 * タブレット・スマホには影響させない。
 *
 * 直前までの実効値:
 *   bottom: clamp(64px, 8vh, 88px);
 *
 * その各値へ20px加算:
 *   64px -> 84px
 *   8vh  -> 8vh + 20px
 *   88px -> 108px
 */
@media (min-width: 901px) {
  .selection-shell {
    bottom: clamp(104px, calc(8vh + 40px), 128px);
  }
}

/* ===== v7.0.0: fast perceived startup / staged Three.js loading ===== */
.network-loader {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background:
    radial-gradient(
      circle at 50% 42%,
      rgba(255, 255, 255, 0.98) 0 9%,
      rgba(232, 249, 255, 0.92) 28%,
      rgba(156, 222, 246, 0.82) 58%,
      rgba(83, 191, 230, 0.88) 100%
    );
  opacity: 1;
  visibility: visible;
  transition:
    opacity 0.42s ease,
    visibility 0.42s ease;
  overflow: hidden;
}
.network-loader[hidden] {
  display: none !important;
}
.network-loader.is-leaving {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.network-loader-inner {
  width: min(360px, 78vw);
  text-align: center;
  color: #123544;
}
.network-loader-orbit {
  position: relative;
  width: 122px;
  height: 122px;
  margin: 0 auto 24px;
  display: grid;
  place-items: center;
}
.network-loader-core {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 28%, #fff 0 20%, #e6f9ff 38%, #78d7f6 72%, #20a6dc 100%);
  box-shadow:
    0 0 0 8px rgba(255,255,255,0.25),
    0 0 42px rgba(62, 190, 237, 0.58);
}
.network-loader-orbit i {
  position: absolute;
  width: 108px;
  height: 42px;
  border: 2px solid rgba(18, 154, 211, 0.66);
  border-radius: 50%;
  animation: networkLoaderOrbit 1.45s linear infinite;
}
.network-loader-orbit i:nth-of-type(2) {
  transform: rotate(62deg);
  border-color: rgba(82, 199, 238, 0.58);
  animation-duration: 1.9s;
  animation-direction: reverse;
}
.network-loader-orbit i:nth-of-type(3) {
  transform: rotate(-58deg);
  width: 88px;
  border-color: rgba(255, 255, 255, 0.86);
  animation-duration: 1.15s;
}
.network-loader-brand {
  margin: 0;
  font-weight: 900;
  font-size: 24px;
  letter-spacing: 0.08em;
}
.network-loader-label {
  margin: 8px 0 18px;
  font-family: "Arial Narrow", "Roboto Condensed", sans-serif;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.24em;
  color: #537887;
}
.network-loader-track {
  height: 3px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255,255,255,0.56);
  box-shadow: inset 0 0 0 1px rgba(54, 152, 193, 0.08);
}
.network-loader-track span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, #70d7f6, #159ed9);
  transition: transform 0.22s ease;
}
.network-loader-percent {
  margin: 9px 0 0;
  font-family: "Arial Narrow", sans-serif;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: #5f8290;
}
@keyframes networkLoaderOrbit {
  from { rotate: 0deg; }
  to { rotate: 360deg; }
}

/* ファーストビュー外の描画コストを初回から外す。見た目・本文は変更しない。 */
@supports (content-visibility: auto) {
  .section {
    content-visibility: auto;
    contain-intrinsic-size: auto 900px;
  }
  .manual-bridge {
    content-visibility: auto;
    contain-intrinsic-size: auto 150px;
  }
  .cta-section {
    content-visibility: auto;
    contain-intrinsic-size: auto 480px;
  }
  .site-footer {
    content-visibility: auto;
    contain-intrinsic-size: auto 220px;
  }
}

@media (max-width: 720px) {
  .network-loader-inner {
    width: min(310px, 76vw);
  }
  .network-loader-orbit {
    width: 104px;
    height: 104px;
    margin-bottom: 20px;
  }
  .network-loader-orbit i {
    width: 94px;
    height: 36px;
  }
  .network-loader-orbit i:nth-of-type(3) {
    width: 78px;
  }
  .network-loader-brand {
    font-size: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .network-loader-orbit i {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
  .network-loader-track span {
    transition: none;
  }
}



/* ===== v7.1: first-view compositing performance tuning =====
 * WebGL canvasの上に重なる大面積ガラスUIのblur半径をPCのみ少し抑え、
 * 土星・カード回転中のGPU合成負荷を軽減する。透明感とレイアウトは維持する。
 */
@media (min-width: 901px) {
  .site-head {
    backdrop-filter: blur(12px) saturate(1.04);
  }

  .selection {
    backdrop-filter: blur(10px);
  }
}