:root {
  color-scheme: dark;
  --bg: #070814;
  --bg-2: #0b0d1d;
  --panel: rgba(255, 255, 255, 0.065);
  --panel-strong: rgba(255, 255, 255, 0.105);
  --text: #f5f7ff;
  --muted: #aeb6d9;
  --muted-2: #7e88b4;
  --line: rgba(255, 255, 255, 0.13);
  --accent: #9b7cff;
  --accent-2: #56b6ff;
  --gold: #e7c873;
  --danger: #ff7aa8;
  --radius: 24px;
  --radius-sm: 16px;
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.38);
  --max: 1120px;
  --article: 780px;
}

* { box-sizing: border-box; }

html {
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 0%, rgba(155, 124, 255, 0.2), transparent 34rem),
    radial-gradient(circle at 88% 4%, rgba(86, 182, 255, 0.14), transparent 32rem),
    radial-gradient(circle at 50% 100%, rgba(231, 200, 115, 0.07), transparent 30rem),
    linear-gradient(180deg, #070814 0%, #0b0d1d 52%, #070814 100%);
  color: var(--text);
  line-height: 1.85;
}

a { color: inherit; text-decoration: none; }
p { margin: 0 0 1.1rem; }
strong { color: #ffffff; }

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(7, 8, 20, 0.72);
}

.brand {
  display: grid;
  gap: 2px;
  min-width: max-content;
}

.brand-kicker {
  color: var(--gold);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 800;
}

.brand-title {
  font-size: 1.06rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.site-nav a {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.92rem;
  transition: 160ms ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
  border-color: rgba(155, 124, 255, 0.62);
  background: rgba(155, 124, 255, 0.14);
}

.hero {
  padding: clamp(58px, 10vw, 104px) 0 54px;
}

.kicker,
.hero-kicker {
  color: var(--gold);
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.hero h1 {
  max-width: 900px;
  margin: 16px 0 24px;
  font-size: clamp(3.1rem, 9vw, 7.2rem);
  line-height: 0.94;
  letter-spacing: -0.075em;
}

.hero-lead {
  max-width: 820px;
  color: var(--muted);
  font-size: clamp(1.02rem, 2vw, 1.23rem);
}

.hero-actions,
.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid rgba(155, 124, 255, 0.46);
  background: linear-gradient(135deg, rgba(155, 124, 255, 0.26), rgba(86, 182, 255, 0.15));
  color: var(--text);
  font-weight: 800;
  box-shadow: 0 12px 40px rgba(0,0,0,0.18);
}

.button.secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
}

.grid,
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.card {
  display: block;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,0.075), rgba(255,255,255,0.04));
  box-shadow: var(--shadow);
  min-height: 100%;
}

a.card { transition: transform 160ms ease, border-color 160ms ease, background 160ms ease; }
a.card:hover {
  transform: translateY(-3px);
  border-color: rgba(155, 124, 255, 0.58);
  background: linear-gradient(180deg, rgba(155,124,255,0.13), rgba(255,255,255,0.045));
}

.card .eyebrow {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.card h2,
.card h3 {
  margin: 0 0 10px;
  line-height: 1.26;
  letter-spacing: -0.025em;
}

.card p,
.muted {
  color: var(--muted);
}

.section {
  padding: 54px 0;
}

.section.compact { padding: 30px 0; }

.section-title {
  max-width: 780px;
  margin-bottom: 24px;
}

.section-title h2,
.page-title {
  margin: 8px 0 12px;
  font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.055em;
}

.section-title p { color: var(--muted); }

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.badge {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.045);
  font-size: 0.92rem;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 30px 0 0;
}

.meta-item {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.045);
}

.meta-item span {
  display: block;
  color: var(--muted-2);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.meta-item strong {
  display: block;
  margin-top: 4px;
  line-height: 1.35;
}

.page-hero {
  padding: 58px 0 28px;
}

.article {
  max-width: var(--article);
  padding: 54px 0;
}

.article h1 {
  margin: 12px 0 18px;
  font-size: clamp(2.35rem, 6vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.article h2 {
  margin-top: 42px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.article h3 {
  margin-top: 30px;
  letter-spacing: -0.02em;
}

.article p,
.article li {
  color: var(--muted);
}

.article ul,
.article ol { padding-left: 1.25rem; }

.article .lead {
  color: var(--text);
  font-size: 1.12rem;
}

.callout {
  margin: 28px 0;
  padding: 22px;
  border: 1px solid rgba(231, 200, 115, 0.25);
  border-radius: var(--radius-sm);
  background: rgba(231, 200, 115, 0.07);
}

.callout p { margin: 0; color: #efe5c6; }

.term-list {
  display: grid;
  gap: 14px;
}

.term {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.05);
}

.term h2 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.term p { margin: 0; color: var(--muted); }

.table-like {
  display: grid;
  gap: 10px;
  margin: 24px 0;
}

.row {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.045);
}

.row strong { color: var(--text); }
.row span { color: var(--muted); }

.site-footer {
  margin-top: 56px;
  padding: 28px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 820px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

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

  .grid,
  .card-grid,
  .grid.two,
  .card-grid.two,
  .meta-grid {
    grid-template-columns: 1fr;
  }

  .hero { padding-top: 48px; }
  .row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .site-shell { width: min(var(--max), calc(100% - 22px)); }
  .site-nav a { padding: 7px 10px; font-size: 0.86rem; }
  .card { padding: 20px; }
}