:root {
  color-scheme: dark;
  --page-bg: #07090e;
  --content-bg: transparent;
  --surface: rgba(16, 22, 34, 0.72);
  --surface-solid: #101622;
  --text: #d0d5df;
  --muted: #8b93a6;
  --heading: #eef2f8;
  --accent: #3d6fd4;
  --accent-strong: #1949b8;
  --accent-soft: rgba(61, 111, 212, 0.16);
  --accent-hover: #6b92e6;
  --line: rgba(197, 206, 216, 0.14);
  --header-glass: rgba(255, 255, 255, 0.78);
  --header-ink: #1a1f2a;
  --header-muted: #5a6475;
  --max: 68rem;
  --narrow: 40rem;
  --font-display: "Space Grotesk", "Noto Sans JP", sans-serif;
  --font-body: "Noto Sans JP", "Space Grotesk", sans-serif;
  --header-h: 4.5rem;
  --frame-pad: clamp(0.75rem, 2.5vw, 1.75rem);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  min-width: 20rem;
  min-height: 100svh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--page-bg);
}

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

a {
  color: var(--accent-hover);
  text-decoration: none;
}

a:hover {
  color: #9bb6f0;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Full-page space / tech atmosphere */
.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 78% 6%, rgba(25, 73, 184, 0.28), transparent 55%),
    radial-gradient(ellipse 50% 40% at 12% 18%, rgba(120, 150, 200, 0.1), transparent 50%),
    radial-gradient(ellipse 80% 55% at 50% 100%, rgba(12, 20, 40, 0.95), transparent 55%),
    linear-gradient(165deg, #07090e 0%, #0b1220 45%, #07090e 100%);
  animation: atmosphere-drift 18s ease-in-out infinite alternate;
}

.atmosphere::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.55;
  background-image:
    radial-gradient(1px 1px at 12% 22%, rgba(255, 255, 255, 0.55), transparent),
    radial-gradient(1px 1px at 28% 68%, rgba(255, 255, 255, 0.35), transparent),
    radial-gradient(1.5px 1.5px at 46% 18%, rgba(255, 255, 255, 0.45), transparent),
    radial-gradient(1px 1px at 63% 42%, rgba(255, 255, 255, 0.3), transparent),
    radial-gradient(1px 1px at 81% 28%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1.5px 1.5px at 88% 72%, rgba(255, 255, 255, 0.28), transparent),
    radial-gradient(1px 1px at 35% 88%, rgba(255, 255, 255, 0.32), transparent);
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.28;
  background-image:
    linear-gradient(rgba(197, 206, 216, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(197, 206, 216, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 20%, transparent 75%);
}

@keyframes atmosphere-drift {
  from { filter: hue-rotate(0deg) saturate(1); transform: scale(1); }
  to { filter: hue-rotate(10deg) saturate(1.1); transform: scale(1.03); }
}

.page-frame {
  width: min(100%, 76rem);
  min-height: 100svh;
  margin: 0 auto;
  padding: 0 var(--frame-pad);
  display: flex;
  flex-direction: column;
}

.hero-logo-wrap {
  width: min(44rem, 100%);
  margin: 0 auto 1.5rem;
}

.hero-solo .hero-logo-wrap {
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  min-height: var(--header-h);
  padding: 0.55rem max(0.85rem, calc((100vw - min(100vw, 76rem)) / 2 + var(--frame-pad)));
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.45);
  background: var(--header-glass);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
  color: var(--header-ink);
}

.header-start {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.header-matrices {
  display: grid;
  gap: 0.12rem;
  flex: 0 0 auto;
  min-width: 0;
  padding: 0.15rem 0.1rem;
  line-height: 1.2;
  color: var(--header-ink);
}

.header-matrices:hover,
.header-matrices:focus-visible {
  color: var(--accent-strong);
}

.matrices-label {
  font-size: 0.68rem;
  color: var(--header-muted);
  letter-spacing: 0.04em;
}

.matrices-name {
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 2vw, 1.12rem);
  font-weight: 600;
  letter-spacing: 0.1em;
}

.header-brand {
  flex: 0 0 auto;
  padding: 0.15rem 0.55rem;
  border: 0;
}

.header-brand img {
  width: clamp(7.5rem, 18vw, 9.25rem);
  height: auto;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.35rem;
  padding-right: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.site-nav a {
  color: var(--header-ink);
  position: relative;
  padding: 0.2rem 0;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.15rem;
  height: 1px;
  background: var(--accent-strong);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

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

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  margin-right: 0.15rem;
  border: 1px solid rgba(26, 31, 42, 0.16);
  border-radius: 0.3rem;
  background: rgba(255, 255, 255, 0.55);
  color: var(--header-ink);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 1.15rem;
  height: 1.5px;
  background: currentColor;
  position: relative;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before { top: -0.35rem; }
.nav-toggle-bars::after { top: 0.35rem; }

.content-panel {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: transparent;
  border: 0;
  box-shadow: none;
}

.hero {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: clamp(2.5rem, 8vh, 5rem) clamp(1rem, 4vw, 2.5rem) 4rem;
  animation: hero-in 0.9s ease both;
}

.hero-solo {
  padding: clamp(1rem, 3vh, 2rem) 0;
}

.hero-kicker {
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.hero-logo {
  width: min(24rem, 100%);
  margin: 0 auto;
}

.hero-solo .hero-logo {
  width: min(44rem, 92vw);
}

.hero-lead {
  margin: 0 auto 2rem;
  max-width: 28rem;
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  color: #b7c0d0;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

@keyframes hero-in {
  from { opacity: 0; transform: translateY(0.8rem); }
  to { opacity: 1; transform: translateY(0); }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.65rem 1.35rem;
  border-radius: 0.25rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background: var(--accent-strong);
  color: #ffffff;
  border: 1px solid transparent;
}

.btn-primary:hover {
  background: var(--accent);
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: var(--heading);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  border-color: var(--accent-hover);
  color: var(--accent-hover);
  background: var(--accent-soft);
}

.section {
  padding: clamp(3.5rem, 9vh, 6rem) clamp(1rem, 4vw, 2.5rem);
  border-top: 1px solid var(--line);
}

.section-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
}

.section-inner.narrow {
  width: min(100%, var(--narrow));
}

.trail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 1.15rem;
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.trail a {
  color: var(--muted);
}

.trail a:hover,
.trail a:focus-visible {
  color: var(--accent-hover);
}

.eyebrow {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-hover);
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  color: var(--heading);
}

h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(2.05rem, 5vw, 2.7rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
}

h2 {
  margin: 2.35rem 0 0.7rem;
  font-size: clamp(1.18rem, 2.2vw, 1.38rem);
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1.4;
}

h3 {
  margin: 1.6rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.45;
  color: var(--accent-hover);
}

h4 {
  margin: 1.35rem 0 0.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1.5;
  color: var(--muted);
}

.eyebrow + h1,
.eyebrow + h2 {
  margin-top: 0;
}

strong {
  font-weight: 700;
  letter-spacing: 0;
  margin-left: 3pt;
  margin-right: 3pt;
  font-family: var(--font-body);
}

em {
  font-style: normal;
  font-size: 0.82em;
  color: var(--muted);
}

.section-lead,
.about p {
  margin: 0 0 1rem;
}

.about h1:not(:first-of-type) {
  margin-top: 3rem;
}

.about h1 + h2 {
  margin-top: 1.2rem;
}

.about p:last-child {
  margin-bottom: 0;
}

.muted-block {
  background: linear-gradient(180deg, rgba(16, 22, 34, 0.55), transparent);
}

.feature-list {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 2.5rem;
}

.feature-item {
  display: grid;
  gap: 1.5rem;
  align-items: center;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}

.feature-item:first-child {
  padding-top: 0;
  border-top: 0;
}

@media (min-width: 840px) {
  .feature-item:not(.feature-item-tools) {
    grid-template-columns: 1fr 1.1fr;
    gap: 2.5rem;
  }
}

.feature-label {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.feature-item h3 {
  margin: 0 0 0.65rem;
}

.feature-copy p {
  margin: 0 0 1rem;
}

.feature-visual {
  display: flex;
  justify-content: center;
  padding: 1.25rem;
  background: rgba(8, 10, 16, 0.85);
  border: 1px solid var(--line);
}

.feature-visual img {
  width: min(100%, 28rem);
}

.works-list {
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 3rem;
}

.work {
  display: grid;
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.work:first-child {
  padding-top: 0;
  border-top: 0;
}

@media (min-width: 840px) {
  .work {
    grid-template-columns: 1fr 1.05fr;
    gap: 2.5rem;
    align-items: start;
  }
}

.work-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  margin-bottom: 0.65rem;
}

.work-kind,
.work-status {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.work-kind {
  color: var(--muted);
}

.work-status-in-progress {
  color: var(--accent-hover);
}

.work-status-public {
  color: #8fd0b0;
}

.work h3 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.12rem, 2vw, 1.28rem);
  color: var(--heading);
}

.work-note {
  font-size: 0.72em;
  font-weight: 500;
  color: var(--muted);
}

.work-copy p {
  margin: 0 0 1.25rem;
}

.spec-groups {
  display: grid;
  gap: 1.25rem;
  margin: 0 0 0.35rem;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.spec-table caption {
  caption-side: top;
  text-align: left;
  margin-bottom: 0.45rem;
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--heading);
}

.spec-table th,
.spec-table td {
  padding: 0.45rem 0.65rem 0.45rem 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.spec-table th {
  width: 8.5rem;
  color: var(--muted);
  font-weight: 500;
}

.spec-table td {
  color: var(--text);
}

.work-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 10rem;
  padding: 1.25rem;
  background: rgba(8, 10, 16, 0.85);
  border: 1px solid var(--line);
}

.work-visual img {
  width: min(100%, 28rem);
}

.work-wordmark {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--heading);
}

.work .btn {
  margin-top: 0.35rem;
}

.text-link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  border-bottom: 1px solid currentColor;
  padding-bottom: 0.1rem;
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

.link-list,
.banner-list {
  list-style: none;
  margin: 0 0 0.5rem;
  padding: 0;
}

.link-list {
  display: grid;
  gap: 1.5rem;
}

.link-item {
  display: grid;
  gap: 0.85rem 1.5rem;
  align-items: center;
}

@media (min-width: 640px) {
  .link-item {
    grid-template-columns: auto 1fr;
  }
}

.link-banner {
  display: inline-flex;
  flex: 0 0 auto;
}

.link-banner img,
.banner-list img {
  width: auto;
  max-width: 100%;
  height: auto;
}

.link-copy h3 {
  margin: 0 0 0.35rem;
  color: var(--heading);
}

.link-copy p {
  margin: 0;
}

.banner-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
}

.banner-list a {
  display: inline-flex;
}

.site-footer {
  flex: 0 0 auto;
  width: 100vw;
  margin-top: auto;
  margin-left: calc(50% - 50vw);
  padding: 1.35rem max(0.85rem, calc((100vw - min(100vw, 76rem)) / 2 + var(--frame-pad))) 1.25rem;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(6, 8, 14, 0.2), rgba(3, 5, 10, 0.92));
  text-align: right;
}

.footer-brand {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: #c5ced8;
}

.footer-copy {
  margin: 0;
  font-size: 0.78rem;
  color: #7e8796;
}

@media (max-width: 720px) {
  .matrices-label {
    font-size: 0.62rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem max(1rem, calc((100vw - min(100vw, 76rem)) / 2 + var(--frame-pad))) 1rem;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px) saturate(1.2);
    -webkit-backdrop-filter: blur(16px) saturate(1.2);
    border-bottom: 1px solid rgba(26, 31, 42, 0.1);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.85rem 0.25rem;
    border-bottom: 1px solid rgba(26, 31, 42, 0.1);
    color: var(--header-ink);
  }

  .site-nav a::after {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .atmosphere,
  .hero {
    animation: none;
  }
}