:root {
  --bg: #080c14;
  --bg-soft: #0d1117;
  --surface: rgba(22, 29, 43, 0.92);
  --surface-2: rgba(17, 24, 39, 0.86);
  --border: rgba(79, 143, 255, 0.12);
  --text: #e8edf5;
  --muted: #6b7a94;
  --accent: #4f8fff;
  --warm: #f0a84a;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Noto Sans JP', sans-serif;
  --font-mono: 'Space Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: linear-gradient(180deg, #080c14 0%, #0d1117 100%);
  font-family: var(--font-body);
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.7), transparent 92%);
}

a {
  color: inherit;
}

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

.container {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
  backdrop-filter: blur(16px);
  background: linear-gradient(180deg, rgba(8,12,20,0.82), rgba(8,12,20,0.36));
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.nav-inner {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15em;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.nav-brand span {
  color: var(--accent);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
  color: rgba(232,237,245,0.85);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.84rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}

.nav-link:hover {
  transform: translateY(-1px);
  border-color: rgba(79,143,255,0.28);
  background: rgba(79,143,255,0.05);
}

main {
  position: relative;
  z-index: 1;
}

.hero {
  padding: 164px 0 72px;
}

.eyebrow {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
}

.hero h1 {
  max-width: 11ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 5.7rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.hero-copy {
  max-width: 60ch;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.9;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.03);
  color: rgba(232,237,245,0.82);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section {
  padding: 0 0 120px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.04em;
}

.section-head p {
  max-width: 36ch;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.92rem;
}

.posts-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 24px;
  margin-top: 32px;
}

.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 320px;
  padding: 32px;
  border-radius: 24px;
  border: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(79,143,255,0.10) 0%, rgba(255,255,255,0.02) 100%),
    var(--surface);
  text-decoration: none;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.post-card:hover {
  transform: translateY(-6px);
  border-color: rgba(79,143,255,0.28);
  box-shadow: 0 28px 64px rgba(0,0,0,0.22);
}

.post-card:focus-visible,
.btn:focus-visible,
.nav-link:focus-visible,
.aside-link:focus-visible {
  outline: 2px solid rgba(79,143,255,0.6);
  outline-offset: 3px;
}

.post-card::after {
  content: '';
  position: absolute;
  right: -100px;
  bottom: -120px;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79,143,255,0.18) 0%, transparent 70%);
  pointer-events: none;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  color: rgba(232,237,245,0.68);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.post-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.8vw, 2.5rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.post-excerpt {
  max-width: 42ch;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.post-foot {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  color: rgba(232,237,245,0.75);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.post-foot strong {
  color: var(--accent);
  font-weight: 700;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px;
  border-radius: 24px;
  border: 1px solid rgba(255,255,255,0.06);
  background: var(--surface-2);
}

.panel h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}

.panel p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.9rem;
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.checklist li {
  position: relative;
  padding-left: 18px;
  color: rgba(232,237,245,0.82);
  line-height: 1.7;
  font-size: 0.88rem;
}

.checklist li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-50%);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 999px;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}

.btn-primary {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #08111f;
}

.btn-ghost {
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text);
}

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

.article-shell {
  padding: 0 0 120px;
}

.article-hero {
  padding-top: 164px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 24px;
  margin-top: 32px;
}

.article-content {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.article-section {
  padding: 28px;
  border-radius: 24px;
  border: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.02);
}

.article-section h2,
.article-section h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  letter-spacing: -0.03em;
}

.article-section p {
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.9;
}

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

.article-section ul {
  margin: 0;
  padding-left: 18px;
  color: rgba(232,237,245,0.82);
  line-height: 1.8;
}

.article-section li + li {
  margin-top: 10px;
}

pre {
  margin: 0;
  padding: 20px;
  border-radius: 18px;
  overflow: auto;
  background: #09101b;
  border: 1px solid rgba(255,255,255,0.07);
}

code {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: #d8e7ff;
}

pre code {
  color: inherit;
  white-space: pre;
}

.article-callout {
  border-left: 3px solid var(--accent);
}

.article-aside {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.aside-card {
  padding: 24px;
  border-radius: 24px;
  border: 1px solid rgba(255,255,255,0.06);
  background: var(--surface-2);
}

.aside-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: -0.03em;
}

.aside-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.9rem;
}

.aside-card ul {
  margin: 0;
  padding-left: 18px;
  color: rgba(232,237,245,0.82);
  line-height: 1.8;
}

.aside-card li + li {
  margin-top: 8px;
}

.aside-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.02);
  color: var(--text);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: transform 0.2s, border-color 0.2s, background 0.2s;
}

.aside-link:hover {
  transform: translateY(-1px);
  border-color: rgba(79,143,255,0.28);
  background: rgba(79,143,255,0.05);
}

footer {
  padding: 0 0 48px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.07);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

@media (max-width: 920px) {
  .posts-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 720px) {
  .container,
  .nav-inner {
    width: min(100% - 32px, 1200px);
  }

  nav {
    padding: 18px 0;
  }

  .hero,
  .article-hero {
    padding-top: 128px;
  }

  .hero h1 {
    max-width: none;
  }

  .post-card,
  .panel,
  .article-section,
  .aside-card {
    padding: 22px;
  }

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