:root {
  --bg: #0a0a0a;
  --panel: rgba(18, 20, 22, 0.84);
  --panel-strong: #111416;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(128, 229, 236, 0.42);
  --text: #e8e9ea;
  --muted: #a0a7ad;
  --muted-strong: #c5ccd1;
  --accent: #7fdde5;
  --accent-soft: rgba(127, 221, 229, 0.12);
  --danger: #ff8585;
  --max-width: 1120px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.6;
}

body::selection {
  background: var(--accent);
  color: #041012;
}

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

code {
  padding: 0.12rem 0.38rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

.particles,
.site-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.particles {
  z-index: -2;
}

.site-grid {
  z-index: -3;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 80px 80px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-height);
  padding: 18px clamp(20px, 4vw, 48px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(10, 10, 10, 0.78);
}

.site-header.scrolled {
  background: rgba(10, 10, 10, 0.94);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line-strong);
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.82rem;
}

.brand-text,
.site-nav,
.hero-kicker,
.hero-meta,
.section-num,
.section-title-en,
.network-label,
.policy-num,
.project-num,
.project-status,
.project-cat,
.stack-cat,
.value-num,
.note-meta,
.channel-label {
  font-family: "SFMono-Regular", Consolas, monospace;
}

.brand-text {
  color: var(--muted-strong);
  font-size: 0.84rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  color: var(--muted);
  font-size: 0.82rem;
}

.site-nav a {
  position: relative;
  padding: 6px 0;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease-out;
  content: "";
}

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

main,
.footer-inner {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
}

.hero {
  position: relative;
  display: grid;
  min-height: calc(100dvh - var(--header-height));
  align-content: center;
  padding: 72px 0 96px;
}

.hero-kicker {
  margin-bottom: 28px;
  color: var(--accent);
  font-size: clamp(0.78rem, 1.6vw, 0.98rem);
}

.hero-title {
  margin: 0;
  color: var(--text);
  font-size: clamp(4.2rem, 15vw, 10.5rem);
  font-weight: 500;
  line-height: 0.9;
}

.hero-title span,
.accent {
  color: var(--accent);
}

.hero-subtitle {
  min-height: 2.2rem;
  margin: 30px 0 0;
  color: var(--muted-strong);
  font-size: clamp(1.05rem, 2.8vw, 1.7rem);
}

.cursor {
  display: inline-block;
  width: 10px;
  height: 1.15em;
  margin-left: 6px;
  border-right: 2px solid var(--accent);
  transform: translateY(0.15em);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  margin-top: 42px;
  color: var(--muted);
  font-size: 0.88rem;
}

.hero-meta a:hover,
.text-link:hover,
.policy-card a:hover {
  color: var(--accent);
}

.scroll-indicator {
  position: absolute;
  right: 0;
  bottom: 28px;
  display: grid;
  justify-items: center;
  gap: 10px;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
}

.scroll-line {
  width: 1px;
  height: 44px;
  background: var(--accent);
}

.section-pad {
  padding: 94px 0;
  border-top: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: 16px;
  margin-bottom: 42px;
}

.section-num,
.section-title-en {
  color: var(--accent);
  font-size: 0.86rem;
}

.section-title {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.8rem, 4.5vw, 3.5rem);
  font-weight: 500;
  line-height: 1.1;
}

.section-rule {
  height: 1px;
  background: var(--line);
}

.about-grid,
.contact-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
}

.profile-frame {
  position: relative;
  min-height: 420px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(rgba(127, 221, 229, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 221, 229, 0.08) 1px, transparent 1px),
    var(--panel);
  background-size: 28px 28px;
}

.profile-frame::before {
  position: absolute;
  inset: 18%;
  border: 1px solid rgba(127, 221, 229, 0.35);
  content: "";
}

.profile-frame::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 112px;
  height: 112px;
  border: 1px solid var(--accent);
  transform: translate(-50%, -50%) rotate(45deg);
  content: "";
}

.profile-corner {
  position: absolute;
  width: 24px;
  height: 24px;
  border-color: var(--accent);
  border-style: solid;
}

.profile-corner.tl {
  top: 14px;
  left: 14px;
  border-width: 1px 0 0 1px;
}

.profile-corner.tr {
  top: 14px;
  right: 14px;
  border-width: 1px 1px 0 0;
}

.profile-corner.bl {
  bottom: 14px;
  left: 14px;
  border-width: 0 0 1px 1px;
}

.profile-corner.br {
  right: 14px;
  bottom: 14px;
  border-width: 0 1px 1px 0;
}

.profile-tag {
  position: absolute;
  right: 18px;
  bottom: 18px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
}

.about-intro {
  max-width: 640px;
  margin: 0 0 28px;
  color: var(--muted-strong);
  font-size: clamp(1.1rem, 2vw, 1.45rem);
  line-height: 1.9;
}

.values {
  display: grid;
  gap: 14px;
}

.value {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.value-num {
  color: var(--accent);
  font-size: 0.82rem;
}

.value h4,
.project-name,
.stack-cat-jp,
.network-card h3,
.policy-card h2,
.contact-intro h3,
.note-title {
  margin: 0;
  color: var(--text);
  font-weight: 500;
}

.value p,
.project-desc,
.project-detail dd,
.network-card p,
.policy-card p,
.contact-intro p,
.note-summary,
.stack-item,
.channel-val {
  color: var(--muted);
}

.value p {
  margin: 6px 0 0;
}

.stack-grid,
.projects-grid,
.network-grid,
.policy-list,
.notes-list {
  display: grid;
  gap: 18px;
}

.stack-grid,
.network-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.projects-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stack-group,
.project-card,
.network-card,
.policy-card,
.note-item,
.channel {
  border: 1px solid var(--line);
  background: var(--panel);
}

.stack-group {
  padding: 24px;
}

.stack-cat {
  margin-bottom: 10px;
  color: var(--accent);
  font-size: 0.82rem;
}

.stack-cat-jp {
  font-size: 1.25rem;
}

.stack-items,
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.stack-item,
.project-tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  font-size: 0.78rem;
}

.project-card {
  display: grid;
  gap: 18px;
  min-height: 100%;
  padding: 24px;
  transition: border-color 180ms ease-out, transform 180ms ease-out;
}

.project-card.has-link:hover,
.project-card.has-link:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.project-head,
.project-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.project-num,
.project-cat,
.project-meta {
  color: var(--muted);
  font-size: 0.78rem;
}

.project-status {
  padding: 4px 8px;
  border: 1px solid var(--line-strong);
  color: var(--accent);
  font-size: 0.72rem;
}

.project-name {
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  line-height: 1.12;
}

.project-desc {
  margin: 0;
}

.project-detail {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.project-detail dt {
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
}

.project-detail dd {
  margin: 0;
}

.project-view,
.text-link {
  color: var(--accent);
}

.network-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.network-card {
  display: grid;
  gap: 12px;
  padding: 24px;
}

.network-label,
.policy-num {
  color: var(--accent);
  font-size: 0.78rem;
}

.network-card p {
  margin: 0;
}

.text-link {
  width: fit-content;
  margin-top: 8px;
}

.notes-list {
  gap: 12px;
}

.note-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  padding: 20px 22px;
}

.note-meta {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 0.78rem;
}

.note-title {
  font-size: 1.08rem;
}

.note-summary {
  margin: 8px 0 0;
}

.contact-intro h3 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.2;
}

.contact-intro p {
  max-width: 520px;
  margin: 18px 0 0;
}

.contact-channels {
  display: grid;
  gap: 12px;
}

.channel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 20px;
  transition: border-color 180ms ease-out, transform 180ms ease-out;
}

.channel:hover,
.channel:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.channel-label,
.channel-val {
  display: block;
}

.channel-label {
  color: var(--accent);
  font-size: 0.78rem;
}

.channel-val {
  overflow-wrap: anywhere;
}

.channel-arrow {
  color: var(--accent);
  font-size: 1.4rem;
}

.policy-main {
  padding-top: 72px;
}

.policy-hero {
  padding: 72px 0 80px;
}

.policy-title {
  max-width: 10ch;
  margin: 0;
  color: var(--text);
  font-size: clamp(3.5rem, 12vw, 8.6rem);
  font-weight: 500;
  line-height: 0.92;
}

.policy-lead {
  max-width: 720px;
  margin: 30px 0 0;
  color: var(--muted-strong);
  font-size: clamp(1rem, 2vw, 1.25rem);
}

.policy-list {
  padding-bottom: 84px;
}

.policy-card {
  display: grid;
  gap: 12px;
  padding: 26px;
}

.policy-card h2 {
  font-size: 1.35rem;
}

.policy-card p {
  margin: 0;
}

.policy-card a {
  color: var(--muted-strong);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 4px;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 26px 0;
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.82rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
}

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

.reveal,
.stack-group,
.project-card,
.value {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 420ms ease-out, transform 420ms ease-out;
}

.reveal.is-visible,
.stack-group.is-visible,
.project-card.is-visible,
.value.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .reveal,
  .stack-group,
  .project-card,
  .value {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav a::after,
  .project-card,
  .channel {
    transition: none;
  }
}

@media (max-width: 920px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: auto;
    padding-top: 96px;
  }

  .about-grid,
  .contact-grid,
  .stack-grid,
  .projects-grid,
  .network-grid {
    grid-template-columns: 1fr;
  }

  .profile-frame {
    min-height: 320px;
  }

  .scroll-indicator {
    display: none;
  }
}

@media (max-width: 640px) {
  main,
  .footer-inner {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .site-header {
    padding: 14px;
  }

  .site-nav {
    gap: 10px 14px;
    font-size: 0.78rem;
  }

  .section-pad {
    padding: 68px 0;
  }

  .section-head {
    grid-template-columns: auto 1fr;
    gap: 10px 14px;
  }

  .section-title-en {
    grid-column: 1 / -1;
  }

  .section-rule {
    grid-column: 1 / -1;
  }

  .value,
  .note-item,
  .project-detail {
    grid-template-columns: 1fr;
  }

  .project-card,
  .network-card,
  .policy-card,
  .stack-group {
    padding: 20px;
  }

  .project-head,
  .project-foot,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-links {
    justify-content: flex-start;
  }
}