:root {
  --bg: #07090d;
  --bg-soft: #0f141c;
  --panel: rgba(18, 24, 33, 0.82);
  --panel-strong: rgba(12, 17, 25, 0.96);
  --text: #f5f7fa;
  --muted: #aab3bf;
  --line: rgba(255, 255, 255, 0.08);
  --green: #b8ff3b;
  --pink: #ff4db8;
  --cyan: #76f7ff;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  --radius: 24px;
  --radius-sm: 16px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans JP", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 20%, rgba(184, 255, 59, 0.10), transparent 18%),
    radial-gradient(circle at 85% 15%, rgba(255, 77, 184, 0.12), transparent 22%),
    linear-gradient(180deg, #07090d 0%, #090c12 30%, #07090d 100%);
  min-height: 100vh;
}

body.nav-open { overflow: hidden; }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font: inherit; }

.site-shell {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.4;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.85), rgba(0,0,0,0.25));
}

.container {
  width: min(calc(100% - 32px), var(--container));
  margin: 0 auto;
}

.section {
  position: relative;
  padding: 112px 0;
}

.section--tight { padding-top: 72px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--green);
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.eyebrow::before {
  content: "";
  width: 42px;
  height: 1px;
  background: linear-gradient(90deg, var(--green), transparent);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 40px;
}

.section-heading h2,
.hero h1 {
  margin: 0;
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 900;
}

.hero h1 { font-size: clamp(2.6rem, 7vw, 5.8rem); }
.section-heading h2 { font-size: clamp(2rem, 4vw, 3.4rem); }
.section-heading p,
.hero__lead,
.feature-card p,
.platform-card p,
.stat-card__suffix,
.value-card p,
.flow-item p,
.contact-box p,
.nav a,
.footer {
  color: var(--muted);
}

.header {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(20px);
  background: rgba(7, 9, 13, 0.70);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 20px;
}

.logo {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1;
}

.logo__latin {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.logo__jp {
  color: var(--green);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav a {
  font-size: 0.92rem;
  transition: color 0.25s ease;
}

.nav a:hover,
.nav a:focus-visible { color: var(--text); }

.nav__cta {
  color: var(--bg) !important;
  background: var(--green);
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 700;
}

.nav-toggle {
  display: none;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.02);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 999px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-open .nav-toggle span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.hero {
  overflow: clip;
  padding-top: 90px;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 36px;
  align-items: center;
}

.hero__lead {
  max-width: 720px;
  font-size: 1.08rem;
  line-height: 1.95;
  margin: 22px 0 0;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 700;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.button:hover,
.button:focus-visible { transform: translateY(-2px); }

.button--primary {
  color: var(--bg);
  background: linear-gradient(135deg, var(--green), #dbff8c);
  border-color: transparent;
}

.button--ghost {
  background: rgba(255,255,255,0.03);
}

.button--full { width: 100%; }

.hero-card,
.feature-card,
.platform-card,
.stat-card,
.value-card,
.flow-item,
.contact-box {
  position: relative;
  background: linear-gradient(180deg, rgba(19,24,33,0.95), rgba(10,14,20,0.92));
  border: 1px solid rgba(255,255,255,0.08);
  box-shadow: var(--shadow);
}

.hero-card {
  min-height: 520px;
  padding: 34px;
  border-radius: 28px;
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: auto -20% -20% auto;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(255, 77, 184, 0.35), transparent 65%);
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 22px;
  border: 1px solid rgba(184,255,59,0.12);
  pointer-events: none;
}

.hero-card__noise {
  position: absolute;
  inset: 0;
  opacity: 0.05;
  background-image: radial-gradient(#ffffff 0.8px, transparent 0.8px);
  background-size: 12px 12px;
}

.hero-card__label {
  position: relative;
  font-family: "Space Grotesk", sans-serif;
  color: var(--green);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
}

.hero-card__title {
  position: relative;
  margin-top: 80px;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(3rem, 7vw, 5rem);
  line-height: 0.92;
  letter-spacing: -0.05em;
  font-weight: 700;
}

.hero-card__list {
  position: relative;
  list-style: none;
  padding: 0;
  margin: 90px 0 0;
  display: grid;
  gap: 14px;
}

.hero-card__list li {
  display: flex;
  gap: 12px;
  color: var(--muted);
}

.hero-card__list li::before {
  content: "";
  width: 10px;
  height: 10px;
  margin-top: 0.45em;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--green), var(--pink));
  box-shadow: 0 0 18px rgba(184,255,59,0.45);
}

.hero__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.32;
  pointer-events: none;
}

.hero__orb--green {
  width: 260px;
  height: 260px;
  left: -40px;
  top: 120px;
  background: var(--green);
}

.hero__orb--pink {
  width: 320px;
  height: 320px;
  right: -70px;
  top: 90px;
  background: var(--pink);
}

.concept-grid,
.value-grid,
.platform-grid,
.stats-grid {
  display: grid;
  gap: 18px;
}

.concept-grid,
.value-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.platform-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stats-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.feature-card,
.value-card,
.platform-card,
.stat-card {
  border-radius: var(--radius);
  padding: 26px;
}

.feature-card h3,
.value-card h3,
.flow-item h3 {
  margin: 0 0 10px;
  font-size: 1.24rem;
}

.feature-card__index,
.platform-card span,
.flow-item span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(184,255,59,0.08);
  border: 1px solid rgba(184,255,59,0.20);
  color: var(--green);
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  margin-bottom: 18px;
}

.two-column {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 26px;
  align-items: start;
}

.platform-card strong {
  display: block;
  margin-bottom: 10px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.25rem;
  letter-spacing: 0.03em;
}

.stat-card {
  text-align: left;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.stat-card__label {
  color: var(--green);
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: 0.12em;
  font-size: 0.82rem;
}

.stat-card__value {
  margin: 6px 0;
  font-size: clamp(3rem, 6vw, 4.8rem);
  font-weight: 900;
  line-height: 0.95;
}

.stat-card__suffix { margin: 0; }

/* ===== TOPICS / GENRE セクション ===== */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.topic-card {
  position: relative;
  background: linear-gradient(180deg, rgba(19,24,33,0.95), rgba(10,14,20,0.92));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 32px 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 14px;
  min-height: 180px;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: border-color 0.35s ease, transform 0.35s ease;
  overflow: hidden;
}

.topic-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  opacity: 0;
  background: radial-gradient(circle at 50% 100%, rgba(184,255,59,0.10), transparent 70%);
  transition: opacity 0.35s ease;
}

.topic-card:hover::before { opacity: 1; }
.topic-card:hover {
  border-color: rgba(184,255,59,0.25);
  transform: translateY(-4px);
}

.topic-card__genre {
  position: relative;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.topic-card__sub {
  position: relative;
  font-size: 0.88rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ===== TOPICS レスポンシブ ===== */
@media (max-width: 1024px) {
  .topics-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .topics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .topic-card {
    min-height: 140px;
    padding: 24px 16px;
  }
}

.flow-list {
  display: grid;
  gap: 16px;
}

.flow-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  align-items: start;
  border-radius: 22px;
  padding: 22px;
}

.flow-item span {
  margin: 0;
  width: 54px;
  height: 54px;
}

.contact-box {
  border-radius: 32px;
  padding: 34px;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 26px;
}

/* ===== 連絡先情報 ===== */
.contact-box--info {
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-info__person {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact-info__name {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.contact-info__role {
  font-size: 0.95rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.contact-info__bio {
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--muted);
  margin: 0;
}

.contact-info__credits {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact-info__credit-list {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.contact-info__items {
  display: grid;
  gap: 14px;
}

.contact-info__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}

.contact-info__item:hover {
  border-color: rgba(184,255,59,0.30);
  background: rgba(255,255,255,0.05);
  transform: translateY(-2px);
}

.contact-info__label {
  font-family: "Space Grotesk", sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--green);
}

.contact-info__value {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.footer {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 28px 0 50px;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.95rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay { transition-delay: 0.12s; }
.reveal--delay-2 { transition-delay: 0.22s; }

@media (max-width: 1024px) {
  .hero__grid,
  .two-column,
  .contact-box,
  .contact-box--info,
  .platform-grid,
  .stats-grid,
  .concept-grid,
  .value-grid {
    grid-template-columns: 1fr;
  }

  .hero-card {
    min-height: auto;
  }
}

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .nav {
    position: fixed;
    inset: 79px 16px auto 16px;
    display: grid;
    gap: 10px;
    padding: 18px;
    border-radius: 24px;
    background: rgba(9, 13, 18, 0.96);
    border: 1px solid rgba(255,255,255,0.08);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
  }

  .nav-open .nav {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav a { padding: 10px 6px; }
  .nav__cta { text-align: center; }
}

@media (max-width: 640px) {
  .section { padding: 86px 0; }
  .container { width: min(calc(100% - 24px), var(--container)); }
  .header__inner { min-height: 72px; }
  .hero { padding-top: 48px; }
  .hero__lead { font-size: 1rem; line-height: 1.8; }
  .hero-card,
  .feature-card,
  .platform-card,
  .stat-card,
  .value-card,
  .flow-item,
  .contact-box { padding: 20px; border-radius: 22px; }

  .flow-item {
    grid-template-columns: 1fr;
  }

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