/* Match issueplusdesign.jp brand stack: Open Sans (Latin) + 游ゴシック系 (JP) */
@import url("https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;500;600;700&family=Cormorant+Garamond:ital,wght@1,400&display=swap");

:root {
  --background: #050816;
  --foreground: #e8ecf5;
  --accent: #e8602a;
  --muted: #9aa3b5;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
html, body { background: var(--background); color: var(--foreground); }
body {
  font-family: "Open Sans", "Noto Sans JP", "中ゴシックBBB", "Yu Gothic",
    "游ゴシック", "Hiragino Kaku Gothic ProN", "メイリオ", sans-serif;
  font-feature-settings: "palt";
  letter-spacing: 0.04em;
  -webkit-font-smoothing: antialiased;
}
/* Lock scroll only on the index hero (single-screen cosmic scene) */
body:has(> main.hero) { overflow: hidden; height: 100%; }

a { color: inherit; text-decoration: none; }

/* Cosmic background */
.cosmic-bg {
  background:
    radial-gradient(ellipse at 50% 30%, rgba(80, 95, 160, 0.18) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 80%, rgba(50, 30, 90, 0.25) 0%, transparent 60%),
    radial-gradient(ellipse at 10% 90%, rgba(20, 30, 60, 0.4) 0%, transparent 60%),
    linear-gradient(180deg, #050816 0%, #0b1026 55%, #070b1a 100%);
}

.cosmic-noise { position: relative; }
.cosmic-noise::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.04 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.5;
  mix-blend-mode: screen;
  z-index: 0;
}

.starfield::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    /* tiny + bright stars (1px) */
    radial-gradient(1px 1px at 12% 22%, rgba(255,255,255,.8), transparent 60%),
    radial-gradient(1px 1px at 80% 14%, rgba(255,255,255,.65), transparent 60%),
    radial-gradient(1px 1px at 30% 75%, rgba(255,255,255,.6),  transparent 60%),
    radial-gradient(1px 1px at 65% 60%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(1px 1px at 90% 88%, rgba(255,255,255,.5),  transparent 60%),
    radial-gradient(1px 1px at 45% 35%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(1px 1px at 22% 55%, rgba(255,255,255,.6),  transparent 60%),
    radial-gradient(1px 1px at 72% 30%, rgba(255,255,255,.5),  transparent 60%),
    radial-gradient(1px 1px at 5%  5%,  rgba(255,255,255,.4),  transparent 60%),
    radial-gradient(1px 1px at 38% 8%,  rgba(255,255,255,.5),  transparent 60%),
    radial-gradient(1px 1px at 95% 42%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(1px 1px at 18% 88%, rgba(255,255,255,.6),  transparent 60%),
    radial-gradient(1px 1px at 56% 92%, rgba(255,255,255,.45), transparent 60%),
    radial-gradient(1px 1px at 84% 56%, rgba(255,255,255,.5),  transparent 60%),
    radial-gradient(1px 1px at 7%  44%, rgba(255,255,255,.45), transparent 60%),
    radial-gradient(1px 1px at 52% 48%, rgba(255,255,255,.4),  transparent 60%),
    radial-gradient(1px 1px at 28% 14%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(1px 1px at 68% 78%, rgba(255,255,255,.45), transparent 60%),
    radial-gradient(1px 1px at 36% 62%, rgba(255,255,255,.5),  transparent 60%),
    radial-gradient(1px 1px at 76% 7%,  rgba(255,255,255,.4),  transparent 60%),
    radial-gradient(1px 1px at 92% 24%, rgba(255,255,255,.55), transparent 60%),
    radial-gradient(1px 1px at 2%  68%, rgba(255,255,255,.4),  transparent 60%),
    radial-gradient(1px 1px at 49% 78%, rgba(255,255,255,.5),  transparent 60%),
    radial-gradient(1px 1px at 25% 36%, rgba(255,255,255,.45), transparent 60%),
    /* slightly larger stars (1.5px) */
    radial-gradient(1.5px 1.5px at 60% 18%, rgba(220,235,255,.85), transparent 65%),
    radial-gradient(1.5px 1.5px at 16% 72%, rgba(255,245,225,.7),  transparent 65%),
    radial-gradient(1.5px 1.5px at 88% 50%, rgba(220,235,255,.7),  transparent 65%),
    radial-gradient(1.5px 1.5px at 32% 28%, rgba(255,245,225,.7),  transparent 65%),
    radial-gradient(1.5px 1.5px at 82% 80%, rgba(220,235,255,.75), transparent 65%);
  opacity: 0.92;
  z-index: 0;
}

/* Animations */
@keyframes planet-fade-in-inner {
  from { opacity: 0; transform: scale(0.85); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes planet-float-inner {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
/* Earth gentle "swaying / fluffy" motion — rotation + drift + breath, very slow */
@keyframes earth-sway {
  0%   { transform: translate(0px, 0px)   rotate(-1.6deg) scale(1); }
  20%  { transform: translate(5px, -4px)  rotate(-0.3deg) scale(1.012); }
  45%  { transform: translate(2px, -8px)  rotate(1.4deg)  scale(1.018); }
  65%  { transform: translate(-4px, -5px) rotate(0.6deg)  scale(1.01); }
  85%  { transform: translate(-3px, 2px)  rotate(-1deg)   scale(0.996); }
  100% { transform: translate(0px, 0px)   rotate(-1.6deg) scale(1); }
}
@keyframes atmos-breathe {
  0%, 100% { opacity: 0.55; transform: scale(1); }
  50%      { opacity: 1;    transform: scale(1.06); }
}
@keyframes halo-drift {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.7; }
  50%      { transform: translate(-8px, 6px) scale(1.08); opacity: 1; }
}
@keyframes earth-spin-tilt {
  0%, 100% { transform: rotate(-6deg) translateY(0); }
  50%      { transform: rotate(-6deg) translateY(-4px); }
}
@keyframes fade-in-up {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: var(--target-opacity, 1); }
}
@keyframes drift-a {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(6px, -4px); }
}
@keyframes drift-b {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(-5px, 5px); }
}
@keyframes drift-c {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(4px, 6px); }
}
@keyframes orbit-fade-in {
  from { opacity: 0; } to { opacity: 0.16; }
}
@keyframes pulse-glow {
  0%, 100% { opacity: 0.35; }
  50%      { opacity: 0.55; }
}

.animate-fade-in-up { animation: fade-in-up 1.2s ease-out both; }

/* ---- Hero layout (always one screen) ---- */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  height: 100vh;
  height: 100dvh;
  width: 100%;
}

.hero-top {
  position: absolute;
  z-index: 4;
  top: 1.25rem;
  left: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
}
@media (min-width: 768px) {
  .hero-top { top: 1.75rem; left: 2.5rem; }
}
.brand {
  font-size: 0.62rem;
  letter-spacing: 0.4em;
  color: rgba(255,255,255,0.5);
}
.title-block { text-align: left; max-width: 32rem; }
.kicker { font-size: 0.55rem; font-weight: 600; letter-spacing: 0.45em; color: rgba(255,255,255,0.4); margin: 0; }
.hero h1 {
  margin: 0.5rem 0 0;
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.55;
  color: #fff;
  font-size: 1rem;
}
.hero h1 .sub { color: rgba(255,255,255,0.85); display: block; margin-top: 4px; font-size: 0.85em; font-weight: 600; letter-spacing: 0.15em; }
@media (min-width: 768px) { .hero h1 { font-size: 1.25rem; } }
@media (min-width: 1100px) { .hero h1 { font-size: 1.5rem; } }

.hero-stage {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

/* (footer hint removed) */

/* ===== Cosmic ambience: nebulae + dust + twinkling + shooting stars ===== */
.nebulae,
.stardust,
.twinkles,
.shooting-stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

/* Slow-drifting nebula clouds, very soft */
.nebula {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.5;
  mix-blend-mode: screen;
}
.nebula.n1 {
  width: 60vmin; height: 60vmin;
  left: -8vmin; top: -8vmin;
  background: radial-gradient(circle, rgba(120, 70, 180, 0.4) 0%, rgba(120, 70, 180, 0) 60%);
  animation: neb-drift-a 38s ease-in-out infinite;
}
.nebula.n2 {
  width: 70vmin; height: 70vmin;
  right: -12vmin; bottom: -12vmin;
  background: radial-gradient(circle, rgba(40, 120, 180, 0.32) 0%, rgba(40, 120, 180, 0) 60%);
  animation: neb-drift-b 46s ease-in-out infinite;
}
.nebula.n3 {
  width: 45vmin; height: 45vmin;
  right: 18%; top: -10vmin;
  background: radial-gradient(circle, rgba(220, 80, 130, 0.22) 0%, rgba(220, 80, 130, 0) 60%);
  animation: neb-drift-c 54s ease-in-out infinite;
}

@keyframes neb-drift-a {
  0%, 100% { transform: translate(0, 0)    scale(1); }
  50%      { transform: translate(8vmin, 6vmin) scale(1.1); }
}
@keyframes neb-drift-b {
  0%, 100% { transform: translate(0, 0)    scale(1); }
  50%      { transform: translate(-10vmin, -4vmin) scale(1.05); }
}
@keyframes neb-drift-c {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.5; }
  50%      { transform: translate(-4vmin, 10vmin) scale(1.08); opacity: 0.7; }
}

/* Distant cosmic dust — extra tiny faint stars at high density */
.stardust {
  background-image:
    radial-gradient(0.5px 0.5px at 3% 12%,  rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 17% 6%,  rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 26% 19%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 34% 4%,  rgba(255,255,255,.35),transparent 60%),
    radial-gradient(0.5px 0.5px at 41% 16%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 49% 9%,  rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 57% 23%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 64% 3%,  rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 71% 14%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 86% 9%,  rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 96% 17%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 11% 31%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 22% 39%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 31% 47%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 43% 41%, rgba(255,255,255,.35),transparent 60%),
    radial-gradient(0.5px 0.5px at 54% 36%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 62% 49%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 73% 42%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 81% 32%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 91% 47%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 4% 55%,  rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 14% 67%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 25% 76%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 36% 71%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 47% 84%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 58% 79%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 67% 91%, rgba(255,255,255,.4), transparent 60%),
    radial-gradient(0.5px 0.5px at 76% 73%, rgba(255,255,255,.45),transparent 60%),
    radial-gradient(0.5px 0.5px at 85% 85%, rgba(255,255,255,.5), transparent 60%),
    radial-gradient(0.5px 0.5px at 94% 96%, rgba(255,255,255,.35),transparent 60%);
  opacity: 0.75;
}

/* Twinkling stars (a few that pulse) */
.twinkles span {
  position: absolute;
  width: 2px; height: 2px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 6px 1px rgba(255,255,255,0.8);
  animation: twinkle 4.5s ease-in-out infinite;
}
@keyframes twinkle {
  0%, 100% { opacity: 0.25; transform: scale(0.8); }
  50%      { opacity: 1;    transform: scale(1.4); }
}

/* Shooting stars — diagonal streaks that appear occasionally */
.shoot {
  position: absolute;
  width: 140px;
  height: 1px;
  background: linear-gradient(90deg, rgba(255,255,255,0.95), rgba(255,255,255,0));
  border-radius: 9999px;
  opacity: 0;
  filter: drop-shadow(0 0 4px rgba(255,255,255,0.7));
  transform-origin: left center;
}
.shoot.s1 {
  top: 18%; left: -10%;
  transform: rotate(18deg);
  animation: shoot-a 14s linear infinite;
}
.shoot.s2 {
  top: 64%; left: -10%;
  transform: rotate(-12deg);
  animation: shoot-b 22s linear infinite;
  animation-delay: 7s;
}
@keyframes shoot-a {
  0%, 92%   { transform: rotate(18deg) translateX(0);    opacity: 0; }
  93%       { opacity: 0; }
  94%       { opacity: 1; }
  100%      { transform: rotate(18deg) translateX(120vw); opacity: 0; }
}
@keyframes shoot-b {
  0%, 95%   { transform: rotate(-12deg) translateX(0);    opacity: 0; }
  96%       { opacity: 0; }
  97%       { opacity: 1; }
  100%      { transform: rotate(-12deg) translateX(120vw); opacity: 0; }
}


/* ---- Planetary system ---- */
.system {
  position: relative;
  /* fits inside the available stage; aspect 1:1 */
  width: min(94vw, 84vh, 820px);
  aspect-ratio: 1 / 1;
}

.orbit-svg { position: absolute; inset: 0; height: 100%; width: 100%; animation: orbit-fade-in 2s ease-out both; opacity: 0.16; }

.center-glow {
  pointer-events: none;
  position: absolute;
  left: 50%; top: 50%;
  width: 70%; height: 70%;
  margin-left: -35%;
  margin-top: -35%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(80,160,220,0.18) 0%, rgba(80,160,220,0) 65%);
  filter: blur(28px);
  animation: halo-drift 11s ease-in-out infinite;
}

/* Planet wrapper */
.planet {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
}
.planet > .anim { width: 100%; height: 100%; will-change: transform, opacity; position: relative; }
.planet .body {
  position: relative;
  width: 100%; height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: box-shadow .5s ease-out;
  overflow: hidden;
}
.planet .texture {
  position: absolute; inset: 0;
  border-radius: 50%;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.35;
  background:
    radial-gradient(circle at 65% 75%, rgba(255,255,255,.05) 0%, transparent 40%),
    radial-gradient(circle at 30% 60%, rgba(0,0,0,.25)   0%, transparent 55%);
}
.planet .rim {
  position: absolute; inset: 0;
  border-radius: 50%;
  pointer-events: none;
  box-shadow: inset 0 0 18px rgba(220,230,255,0.08);
}

/* ---- Center planet : Earth (NASA Apollo 17 photo) ---- */
.planet.center {
  width: 48%; height: 48%;
}
.planet.center .body {
  background-color: #02060f;
  background-image: url("./earth.jpg");
  background-size: 118%;
  /* Image is centered on India (~77°E). Pull a touch right to lean further into Asia. */
  background-position: 64% 50%;
  background-repeat: no-repeat;
  box-shadow:
    inset -18px -22px 60px rgba(0,0,0,0.55),
    inset 14px 14px 40px rgba(180,220,255,0.06),
    0 0 70px rgba(80,160,220,0.22);
}
/* Soft inner shading so the photo reads as a 3D sphere */
.planet.center .texture {
  opacity: 0.55;
  mix-blend-mode: multiply;
  background:
    radial-gradient(circle at 28% 24%, rgba(255,255,255,0) 0%, rgba(255,255,255,0) 45%, rgba(0,0,0,0.45) 100%);
}
.planet.center .rim { box-shadow: inset 0 0 36px rgba(140,200,255,0.15); }
/* Atmospheric halo just outside the Earth */
.planet.center .atmos {
  position: absolute;
  inset: -7%;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(120,180,230,0) 54%, rgba(120,180,230,0.26) 60%, rgba(120,180,230,0) 76%);
  filter: blur(2px);
  animation: atmos-breathe 8s ease-in-out infinite;
}
.planet.center .anim {
  animation:
    planet-fade-in-inner 1.8s ease-out 0ms both,
    earth-sway 16s ease-in-out 1800ms infinite;
  transform-origin: 50% 55%;
}

/* Keywords floating on the Earth ---------------------------------------- */
.planet.center .surface-keywords {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  overflow: hidden;
  pointer-events: none;
  z-index: 2;
}
.planet.center .surface-keywords .kw {
  position: absolute;
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: #fff;
  /* Stacked tight black shadows create a dark outline that holds up over
     bright clouds and dark oceans alike. */
  text-shadow:
    0 0 2px #000,
    0 0 3px #000,
    0 0 5px rgba(0,0,0,0.95),
    0 0 9px rgba(0,0,0,0.9),
    0 0 16px rgba(0,0,0,0.7),
    0 1px 2px rgba(0,0,0,0.95);
  animation: fade-in 1.6s ease-out both;
  --target-opacity: 1;
  /* Soft dark glow pad behind each keyword, no hard edge */
  filter: drop-shadow(0 0 6px rgba(0,0,0,0.7));
}
.planet.center .surface-keywords .kw.s  { font-size: 0.74rem; font-weight: 500; }
.planet.center .surface-keywords .kw.m  { font-size: 0.88rem; }
.planet.center .surface-keywords .kw.l  { font-size: 1.05rem; font-weight: 700; }
@media (min-width: 1100px) {
  .planet.center .surface-keywords .kw.s { font-size: 0.84rem; }
  .planet.center .surface-keywords .kw.m { font-size: 1rem; }
  .planet.center .surface-keywords .kw.l { font-size: 1.25rem; }
}

/* Center label on the Earth — Japanese title big, English subtitle below.
   Now an anchor: clickable and links to wicked-problem.html */
.wicked-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  z-index: 3;
  cursor: pointer;
  text-decoration: none;
  outline: none;
  transition: filter .5s ease, transform .5s ease;
  animation: fade-in 2.2s ease-out 400ms both;
  --target-opacity: 1;
}
.wicked-label:hover,
.wicked-label:focus-visible {
  filter: brightness(1.15);
  transform: scale(1.04);
}
.wicked-label .l1 {
  display: block;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.15em;
  line-height: 1.05;
  font-size: clamp(1.95rem, 5.6vmin, 3.4rem);
  text-shadow:
    0 1px 2px rgba(0,0,0,0.95),
    0 0 14px rgba(0,0,0,0.85),
    0 0 28px rgba(20,40,80,0.6);
}
.wicked-label .l2 {
  display: block;
  margin-top: 0.85em;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.4em;
  font-size: clamp(0.85rem, 1.7vmin, 1.15rem);
  text-shadow:
    0 1px 2px rgba(0,0,0,0.92),
    0 0 10px rgba(0,0,0,0.78);
}

/* Orbiting planets */
.planet.orbit { width: 18%; height: 18%; }
.planet.orbit .body {
  box-shadow:
    inset -8px -12px 26px rgba(0,0,0,0.55),
    inset 6px 8px 20px rgba(255,255,255,0.06),
    0 0 24px rgba(120,140,200,0.18);
}
/* Label overlaying the orbit planet — sub + title stacked, allowed to overflow */
.planet.orbit .orbit-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  pointer-events: none;
  z-index: 3;
  line-height: 1.15;
}
.planet.orbit .orbit-label .sub {
  white-space: nowrap;
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: rgba(255,255,255,0.92);
  margin-bottom: 0.3em;
  text-shadow:
    0 0 2px #000, 0 0 3px #000,
    0 0 5px rgba(0,0,0,0.95),
    0 0 9px rgba(0,0,0,0.9),
    0 0 16px rgba(0,0,0,0.7);
  transition: color .5s ease;
}
.planet.orbit .orbit-label .ttl {
  white-space: nowrap;
  font-weight: 600;
  font-size: 1.85rem;
  letter-spacing: 0.15em;
  color: #fff;
  text-shadow:
    0 0 2px #000, 0 0 3px #000,
    0 0 5px rgba(0,0,0,0.95),
    0 0 9px rgba(0,0,0,0.9),
    0 0 16px rgba(0,0,0,0.7);
  transition: color .5s ease;
}
@media (min-width: 1100px) {
  .planet.orbit .orbit-label .sub { font-size: 1.1rem; }
  .planet.orbit .orbit-label .ttl { font-size: 2.05rem; letter-spacing: 0.15em; }
}

.planet.orbit a { display: block; width: 100%; height: 100%; position: relative; cursor: pointer; outline: none; overflow: visible; }
/* hover-glow element kept in markup but rendered invisible */
.planet.orbit .hover-glow { display: none; }
.planet.orbit .scale-on-hover {
  width: 100%; height: 100%;
  transition: transform .5s ease-out, filter .5s ease-out;
}
/* A + F : scale up + brightness / saturation lift */
.planet.orbit a:hover .scale-on-hover,
.planet.orbit a:focus-visible .scale-on-hover {
  transform: scale(1.06);
  filter: brightness(1.18) saturate(1.1);
}

/* (Hover label color/glow shift removed — A+E+F handles hover feel) */

/* ---- Mobile (<= 640px) : shrink everything; keep one screen ---- */
@media (max-width: 640px) {
  .hero { padding: 1rem; }
  .hero-top { flex-direction: column; align-items: stretch; gap: 0.5rem; }
  .title-block { text-align: left; }
  .hero h1 { font-size: 0.85rem; }
  .system { width: min(96vw, 65vh); }
  .planet.center { width: 52%; height: 52%; }
  .planet.orbit { width: 22%; height: 22%; }
  .planet.center .surface-keywords .kw.l { font-size: 0.78rem; }
  .planet.center .surface-keywords .kw.m { font-size: 0.66rem; }
  .planet.center .surface-keywords .kw.s { font-size: 0.58rem; }
  .wicked-label .l1 { font-size: 1.45rem; letter-spacing: 0.1em; }
  .wicked-label .l2 { font-size: 0.65rem; letter-spacing: 0.32em; margin-top: 0.7em; }
  .planet.orbit .orbit-label .sub { font-size: 0.72rem; letter-spacing: 0.1em; margin-bottom: 0.2em; }
  .planet.orbit .orbit-label .ttl { font-size: 1.2rem; letter-spacing: 0.04em; }
  .orbit-label .ttl { font-size: 0.6rem; letter-spacing: 0.1em; }
  .orbit-label .num { font-size: 0.45rem; }
  .planet.orbit .subcopy { display: none; }
  .keyword.small { font-size: 0.5rem; }
  .keyword.mid   { font-size: 0.55rem; }
  .keyword.large { font-size: 0.65rem; }
}

/* ===== Floating contact button (persistent on all pages) ===== */
.contact-fab {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.7rem 1.15rem 0.7rem 0.9rem;
  background: rgba(15, 20, 36, 0.78);
  color: #fff;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  transition: background-color .35s ease, transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}
.contact-fab:hover,
.contact-fab:focus-visible {
  background: var(--accent);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(232, 96, 42, 0.35);
  outline: none;
}
.contact-fab .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.14);
  font-size: 0.78rem;
  line-height: 1;
}
.contact-fab .arrow {
  margin-left: 0.2rem;
  font-size: 0.7rem;
  opacity: 0.7;
  transition: transform .35s ease;
}
.contact-fab:hover .arrow,
.contact-fab:focus-visible .arrow { transform: translateX(3px); opacity: 1; }
@media (min-width: 768px) {
  .contact-fab { right: 1.75rem; bottom: 1.75rem; font-size: 0.72rem; }
}

/* ===== Light theme variant for detail pages ===== */
.light-page {
  background: #f7f8fb;
  color: #1a1a2a;
}
.light-page::before,
.light-page::after { display: none !important; }

/* Common typography on light pages */
.light-page .back-link { color: rgba(20,24,40,0.55); }
.light-page .back-link:hover { color: var(--accent); }

/* ---- Approach page (light) ---- */
.approach {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  padding: 3.5rem 1.5rem;
  background: #f7f8fb;
}
@media (min-width: 768px) { .approach { padding: 5rem 3rem; } }
.approach .wrap { position: relative; z-index: 10; max-width: 64rem; margin: 0 auto; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.66rem;
  letter-spacing: 0.3em;
  color: rgba(20,24,40,0.55);
  transition: color .3s ease;
}
.back-link:hover { color: var(--accent); }

.header-section {
  position: relative;
  margin-top: 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}
@media (min-width: 768px) {
  .header-section { margin-top: 4rem; grid-template-columns: 180px 1fr; gap: 3rem; }
}
.hero-planet { position: relative; margin: 0 auto; width: 6.5rem; height: 6.5rem; }
@media (min-width: 768px) { .hero-planet { width: 8.5rem; height: 8.5rem; } }
.hero-planet .glow { position: absolute; inset: -1.5rem; border-radius: 50%; filter: blur(14px); }
.hero-planet .ball {
  position: relative; width: 100%; height: 100%; border-radius: 50%;
  box-shadow:
    inset -10px -16px 36px rgba(0,0,0,0.6),
    inset 8px 10px 24px rgba(255,255,255,0.08),
    0 0 40px rgba(120,140,200,0.18);
  animation: planet-fade-in-inner 1.4s ease-out both;
}
.hero-planet .tx {
  position: absolute; inset: 0; border-radius: 50%;
  mix-blend-mode: overlay; opacity: 0.4;
  background:
    radial-gradient(circle at 65% 75%, rgba(255,255,255,.06) 0%, transparent 40%),
    radial-gradient(circle at 30% 60%, rgba(0,0,0,.25) 0%, transparent 55%);
}
.hero-planet .lab {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
}
.hero-planet .lab .num { font-size: 0.6rem; letter-spacing: 0.35em; color: rgba(255,255,255,0.45); }
.hero-planet .lab .ttl { margin-top: 0.5rem; font-size: 1rem; font-weight: 300; letter-spacing: 0.2em; color: #fff; }
@media (min-width: 768px) { .hero-planet .lab .ttl { font-size: 1.15rem; } }

.header-text .eyebrow { font-size: 0.62rem; letter-spacing: 0.4em; color: rgba(20,24,40,0.45); margin: 0; }
.header-text h1 { margin: 0.75rem 0 0; font-size: 1.875rem; font-weight: 700; letter-spacing: 0.14em; color: #1a1a2a; }
@media (min-width: 768px) { .header-text h1 { font-size: 3rem; } }
.header-text .sub { margin-top: 1.25rem; font-size: 1.45rem !important; font-weight: 600 !important; letter-spacing: 0.1em; color: var(--accent); }

/* PC: pull eyebrow out of flow so orb-top === リサーチ top */
@media (min-width: 768px) {
  .header-text { position: relative; padding-top: 1.4rem; }
  .header-text .eyebrow { position: absolute; top: 0; left: 0; }
  .header-text h1 { margin-top: 0; }
  .hero-planet { margin-top: 1.4rem; }
}
.header-text .desc { margin: 1.4rem 0 0; max-width: 38rem; font-size: 0.95rem; line-height: 2.1; color: rgba(20,24,40,0.72); }
.header-text .desc + .desc { margin-top: 1.2rem; }

.cases-section { margin-top: 5rem; }
@media (min-width: 768px) { .cases-section { margin-top: 7rem; } }
.cases-head {
  display: flex; align-items: end; justify-content: flex-start;
  border-bottom: 1px solid rgba(20,24,40,0.1);
  padding-bottom: 1.6rem;
}
.cases-head h2 {
  display: flex; align-items: baseline; gap: 0.9rem;
  margin: 0;
  font-size: 1.6rem; font-weight: 700; letter-spacing: 0.06em;
  color: #1a1a2a; line-height: 1.2;
}
@media (min-width: 768px) { .cases-head h2 { font-size: 2.1rem; } }
.cases-head h2 .en {
  font-family: "Cormorant Garamond", serif;
  font-style: italic; font-weight: 400;
  font-size: 1rem; letter-spacing: 0.04em;
  color: rgba(20,24,40,0.55);
}
@media (min-width: 768px) { .cases-head h2 .en { font-size: 1.3rem; } }

.cases-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 768px) { .cases-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .cases-grid { grid-template-columns: repeat(3, 1fr); } }

/* ===== Case card (Pattern 01: Photo top + white card body) ===== */
.case {
  position: relative;
  display: flex; flex-direction: column;
  overflow: hidden;
  border-radius: 1rem;
  border: 1px solid rgba(20,24,40,0.08);
  background: #ffffff;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 1px 2px rgba(20,24,40,0.04);
  transition: transform .5s ease, border-color .5s ease, box-shadow .5s ease;
}
.case:hover {
  transform: translateY(-3px);
  border-color: rgba(232,96,42,0.45);
  box-shadow: 0 14px 30px rgba(20,24,40,0.1);
}
.case .photo {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #e8ecf2;
}
.case .photo .placeholder,
.case .photo img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .8s ease;
}
.case:hover .photo .placeholder,
.case:hover .photo img { transform: scale(1.04); }
.case .placeholder {
  display: flex; align-items: center; justify-content: center;
  font-family: "Open Sans", sans-serif;
  font-size: 0.6rem; letter-spacing: 0.35em;
  color: rgba(255,255,255,0.55); text-transform: uppercase;
}
.case .placeholder.c1 { background: linear-gradient(135deg, hsl(210 35% 38%) 0%, hsl(210 40% 22%) 100%); }
.case .placeholder.c2 { background: linear-gradient(135deg, hsl(28 60% 50%) 0%, hsl(14 50% 30%) 100%); }
.case .placeholder.c3 { background: linear-gradient(135deg, hsl(165 25% 38%) 0%, hsl(195 35% 22%) 100%); }
.case .placeholder.c4 { background: linear-gradient(135deg, hsl(250 30% 42%) 0%, hsl(250 35% 22%) 100%); }
.case .placeholder.c5 { background: linear-gradient(135deg, hsl(305 22% 40%) 0%, hsl(305 30% 22%) 100%); }
.case .placeholder.c6 { background: linear-gradient(135deg, hsl(28 40% 40%) 0%, hsl(28 50% 22%) 100%); }

/* Theme chip removed — logo + project name make the category self-evident */
.case .theme { display: none; }

.case .body {
  flex: 1;
  display: flex; flex-direction: column;
  padding: 1.4rem 1.5rem 1.5rem;
  gap: 0.7rem;
}
.case .ttl {
  margin: 0;
  font-size: 1.05rem; font-weight: 700;
  letter-spacing: 0.06em; line-height: 1.6;
  color: #1a1a2a;
  order: 1;  /* render first */
}
/* When .ttl is structured with project name + summary, show name as small eyebrow above */
.case .ttl .name {
  display: block;
  font-size: 0.62rem; font-weight: 600; letter-spacing: 0.25em;
  color: rgba(232,96,42,0.95);
  margin-bottom: 0.55rem;
}
.case .ttl .summary {
  display: block;
  font-size: 1.05rem; font-weight: 700; color: #1a1a2a;
  letter-spacing: 0.05em; line-height: 1.6;
}
@media (min-width: 768px) { .case .ttl .summary { font-size: 1.1rem; } }
@media (min-width: 768px) { .case .ttl { font-size: 1.1rem; } }
/* Partner row always sticks to bottom regardless of title length.
   Unified layout for all cards: "パートナー" label (top-left), logo (centered), arrow (right). */
.case .partner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto auto;
  gap: 0.55rem 0;
  align-items: center;
  margin-top: auto;
  padding-top: 0.95rem;
  padding-bottom: 0.2rem;
  border-top: 1px solid rgba(20,24,40,0.08);
  order: 3;
}
.case .partner::before {
  content: "パートナー";
  grid-column: 1 / -1; grid-row: 1;
  justify-self: start;
  font-size: 0.62rem; font-weight: 600;
  letter-spacing: 0.22em;
  color: rgba(20,24,40,0.45);
}
.case .partner .logo {
  height: 52px; width: auto;
  min-width: 52px; max-width: 140px;
  padding: 7px 12px;
  border-radius: 8px;
  background: #ffffff;
  border: 1px solid rgba(20,24,40,0.08);
  display: flex; align-items: center; justify-content: center;
  font-family: "Open Sans", sans-serif;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em;
  color: #1a1a2a;
  flex: none;
}
.case .partner .logo img { max-width: 100%; max-height: 100%; width: auto; height: auto; display: block; object-fit: contain; }
.case .partner .logo {
  grid-column: 2; grid-row: 2;
}
/* Support multiple logos side-by-side via .logo-group wrapper */
.case .partner .logo-group {
  grid-column: 2; grid-row: 2;
  display: flex; align-items: center;
  gap: 0.6rem;
}
.case .partner .logo-group .logo {
  grid-column: auto; grid-row: auto;
}
/* Partner name (in .meta) — show only when no real logo image (placeholder cards) */
.case .partner .meta {
  grid-column: 1 / -1; grid-row: 3;
  margin-top: 0.5rem;
  display: flex; flex-direction: column; align-items: center;
  text-align: center; min-width: 0;
}
.case .partner .meta .label { display: none; }
.case .partner .meta .name {
  font-size: 0.78rem; letter-spacing: 0.06em;
  color: rgba(20,24,40,0.75);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.case .partner:has(.logo img) .meta { display: none; }
.case .arrow {
  grid-column: 3; grid-row: 2;
  justify-self: end;
  color: rgba(20,24,40,0.35);
  transition: transform .4s ease, color .4s ease;
}
.case:hover .arrow { color: var(--accent); transform: translateX(3px); }

.approach-foot { margin-top: 3rem; text-align: center; font-size: 0.62rem; letter-spacing: 0.3em; color: rgba(20,24,40,0.5); }
@media (min-width: 768px) { .approach-foot { margin-top: 4rem; } }
.approach-foot a { transition: color .3s ease; }
.approach-foot a:hover { color: var(--accent); }

/* ===== Other approaches navigation (subtle, borderless grid) ===== */
.other-approaches {
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid rgba(20,24,40,0.1);
}
@media (min-width: 768px) { .other-approaches { margin-top: 7rem; } }
.other-approaches > .head { margin-bottom: 1.8rem; }
.other-approaches > .head h2 {
  display: flex; align-items: baseline; gap: 0.9rem;
  margin: 0;
  font-size: 1.3rem; font-weight: 700; letter-spacing: 0.06em;
  color: #1a1a2a; line-height: 1.2;
}
@media (min-width: 768px) { .other-approaches > .head h2 { font-size: 1.45rem; } }
.other-approaches > .head h2 .en {
  font-family: "Cormorant Garamond", serif;
  font-style: italic; font-weight: 400;
  font-size: 0.95rem; letter-spacing: 0.04em;
  color: rgba(20,24,40,0.55);
}
@media (min-width: 768px) { .other-approaches > .head h2 .en { font-size: 1.1rem; } }

.other-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.4rem 1rem;
}
@media (min-width: 720px) { .other-grid { grid-template-columns: repeat(5, 1fr); gap: 0.6rem; } }

.other-item {
  text-decoration: none; color: #1a1a2a;
  display: flex; flex-direction: column;
  align-items: center; text-align: center;
  gap: 0.7rem;
  padding: 1.1rem 0.6rem;
  border-radius: 0.6rem;
  border: none;
  background: transparent;
  transition: background .25s ease;
}
.other-item:hover {
  background: rgba(20,24,40,0.03);
  transform: none;
  box-shadow: none;
}
.other-item .orb {
  width: 40px; height: 40px;
  border-radius: 50%;
  box-shadow:
    inset -2px -3px 8px rgba(0,0,0,0.4),
    inset 2px 2px 6px rgba(255,255,255,0.1);
}
.other-item .num { display: none; }
.other-item .ttl {
  font-size: 0.88rem; font-weight: 700; letter-spacing: 0.08em;
  color: #1a1a2a;
}
.other-item .sub {
  font-size: 0.65rem; letter-spacing: 0.08em;
  color: rgba(20,24,40,0.5); font-weight: 400;
  line-height: 1.5;
}