:root {
  --bg: #07090d;
  --bg-elevated: rgba(255, 255, 255, 0.03);
  --line: rgba(255, 255, 255, 0.1);
  --ink: #f2f5f8;
  --muted: rgba(242, 245, 248, 0.62);
  --accent: #7cf5d0;
  --accent-strong: #3ee6b5;
  --accent-dim: rgba(124, 245, 208, 0.14);
  --font: "Space Grotesk", "Noto Sans JP", system-ui, sans-serif;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --max: 68rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

.bg-grid,
.bg-orb {
  pointer-events: none;
  position: fixed;
  z-index: 0;
}

.bg-grid {
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 20%, transparent 75%);
}

.bg-orb {
  width: 42vw;
  height: 42vw;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.45;
  animation: drift 14s ease-in-out infinite;
}

.bg-orb-a {
  top: -8%;
  right: -6%;
  background: radial-gradient(circle, rgba(62, 230, 181, 0.45), transparent 68%);
}

.bg-orb-b {
  bottom: 8%;
  left: -12%;
  width: 36vw;
  height: 36vw;
  background: radial-gradient(circle, rgba(90, 140, 255, 0.28), transparent 70%);
  animation-delay: -5s;
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.35rem var(--gutter);
}

.logo {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1.35rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--accent);
}

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem var(--gutter) 5rem;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: calc(100svh - 5.5rem);
}

.hero-kicker {
  margin: 0 0 1.1rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-brand {
  margin: 0;
  font-size: clamp(4.2rem, 16vw, 9.5rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.06em;
  background: linear-gradient(120deg, #ffffff 0%, #d7fff1 45%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: brand-in 1s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.hero-lead {
  max-width: 34rem;
  margin: 1.75rem 0 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 2vw, 1.18rem);
  line-height: 1.75;
}

.hero-lead span {
  display: inline-block;
  margin-top: 0.45rem;
  color: rgba(242, 245, 248, 0.48);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2.1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.7rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent);
  color: #04140f;
  box-shadow: 0 0 0 1px rgba(124, 245, 208, 0.2), 0 10px 30px rgba(62, 230, 181, 0.2);
}

.btn-primary:hover {
  background: #a8ffdf;
  color: #04140f;
}

.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.02);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  border-color: rgba(124, 245, 208, 0.45);
  color: var(--accent);
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 9vw, 6.5rem) var(--gutter);
}

.section-head {
  max-width: 38rem;
  margin-bottom: 2.4rem;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.section-sub {
  margin: 0.85rem 0 0;
  color: var(--muted);
}

.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.apps-intro {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5rem) var(--gutter) 1rem;
}

.apps-intro .section-head {
  margin-bottom: 0;
}

.product {
  padding: clamp(3rem, 8vw, 5.5rem) var(--gutter);
  border-top: 1px solid var(--line);
}

.product-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 860px) {
  .product-inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 3.5rem;
  }

  .product-alt .product-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .product-alt .product-visual {
    order: 2;
  }

  .product-alt .product-copy {
    order: 1;
  }
}

.product-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 16rem;
  padding: 2.5rem;
  border-radius: 1.75rem;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at 30% 30%, rgba(124, 245, 208, 0.12), transparent 55%),
    linear-gradient(160deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015));
  overflow: hidden;
}

.product-index {
  position: absolute;
  top: 1.1rem;
  left: 1.25rem;
  color: rgba(242, 245, 248, 0.18);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.06em;
  line-height: 1;
}

.product-icon-wrap {
  position: relative;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.product:hover .product-icon-wrap {
  transform: translateY(-6px) scale(1.03);
}

.product-icon {
  width: clamp(7.5rem, 18vw, 10rem);
  height: clamp(7.5rem, 18vw, 10rem);
  border-radius: 1.6rem;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 24px 48px rgba(0, 0, 0, 0.45);
}

.product-copy .tag {
  margin: 0 0 0.9rem;
}

.product-copy h3 {
  margin: 0 0 0.85rem;
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.65rem;
  border: 1px solid rgba(124, 245, 208, 0.28);
  border-radius: 999px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.app-ja,
.app-en {
  margin: 0;
  max-width: 34rem;
}

.app-ja {
  color: rgba(242, 245, 248, 0.86);
  font-size: 1.05rem;
  line-height: 1.7;
}

.app-en {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.app-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.2rem;
  margin-top: 1.4rem;
  font-size: 0.92rem;
  font-weight: 600;
}

.app-links a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.app-links a:hover {
  border-bottom-color: currentColor;
}

.about-grid {
  display: grid;
  gap: 1.4rem;
}

@media (min-width: 860px) {
  .about-grid {
    grid-template-columns: 1.2fr 1fr;
    gap: 1.75rem 2.75rem;
  }

  .about-meta {
    grid-column: 1 / -1;
  }
}

.about-body {
  margin: 0;
  color: rgba(242, 245, 248, 0.84);
  font-size: 1.05rem;
}

.about-body.en {
  color: var(--muted);
  font-size: 0.98rem;
}

.about-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin: 0.6rem 0 0;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.25rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
  backdrop-filter: blur(10px);
}

@media (min-width: 720px) {
  .about-meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.about-meta dt {
  margin: 0 0 0.25rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.about-meta dd {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
}

.contact-mail {
  display: inline-block;
  font-size: clamp(1.35rem, 3.8vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  text-decoration: none;
  color: var(--ink);
  border-bottom: 1px solid rgba(124, 245, 208, 0.4);
}

.contact-mail:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.contact-note {
  margin: 1rem 0 0;
  color: var(--muted);
}

.site-footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem var(--gutter) 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

.site-footer p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transition: opacity 0.75s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.75s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal-up {
  transform: translateY(28px);
}

.reveal-left {
  transform: translateX(-40px);
}

.reveal-right {
  transform: translateX(40px);
}

.reveal:not(.reveal-up):not(.reveal-left):not(.reveal-right) {
  transform: translateY(16px);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@keyframes brand-in {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
    letter-spacing: 0.04em;
  }
  to {
    opacity: 1;
    transform: none;
    letter-spacing: -0.06em;
  }
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(-2%, 3%, 0) scale(1.08);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .hero-brand,
  .bg-orb,
  .product-icon-wrap {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}