:root {
  --bg: #fffaf0;
  --bg-elev: rgba(255, 255, 255, 0.6);
  --fg: #2d1b0e;
  --fg-soft: #4b3a2c;
  --muted: #6b5e4f;
  --accent: #d97706;
  --accent-hover: #b45309;
  --border: rgba(45, 27, 14, 0.12);
  --border-strong: rgba(45, 27, 14, 0.2);
  --max-width: 720px;
  --max-width-wide: 960px;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(45, 27, 14, 0.04), 0 8px 24px rgba(45, 27, 14, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a120b;
    --bg-elev: rgba(255, 255, 255, 0.04);
    --fg: #f4ebdd;
    --fg-soft: #d6c7b1;
    --muted: #b09b80;
    --accent: #fbbf24;
    --accent-hover: #fcd34d;
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.18);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover {
  color: var(--accent-hover);
}

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--fg);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}
.brand-mark {
  font-size: 1.4rem;
}
.brand-name {
  font-feature-settings: "ss01";
}

.site-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover {
  color: var(--accent);
}
.site-nav a[aria-current="page"] {
  color: var(--fg);
  border-bottom-color: var(--accent);
}

/* ---------- Hero (homepage) ---------- */
.hero {
  text-align: center;
  padding: 80px 24px 40px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.hero-mark {
  font-size: 4rem;
  display: inline-block;
  transform: rotate(-8deg);
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.5rem);
  font-weight: 800;
  margin: 16px 0 8px;
  letter-spacing: -0.02em;
}
.hero-tagline {
  font-size: 1.2rem;
  color: var(--fg-soft);
  margin: 0 0 4px;
}
.hero-sub {
  font-size: 1rem;
  color: var(--muted);
  margin: 0 0 36px;
}
.cta {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.cta a {
  display: inline-flex;
  align-items: center;
  padding: 12px 22px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.05s ease, background 0.15s ease;
}
.cta-primary {
  background: var(--fg);
  color: var(--bg);
}
.cta-primary:hover {
  background: var(--accent);
  color: #fff;
}
.cta-secondary {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border-strong);
}
.cta-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Card grid (homepage) ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  max-width: var(--max-width-wide);
  margin: 40px auto 80px;
  padding: 0 24px;
}
.card {
  display: block;
  padding: 22px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--fg);
  transition: transform 0.1s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.card h2 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 700;
}
.card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.55;
}

/* ---------- Prose (legal pages) ---------- */
.content {
  max-width: var(--max-width);
  margin: 48px auto 80px;
  padding: 0 24px;
}

.prose h1 {
  font-size: clamp(1.8rem, 4vw, 2.2rem);
  font-weight: 800;
  margin: 0 0 0.4em;
  letter-spacing: -0.01em;
}
.prose h2 {
  font-size: 1.35rem;
  margin-top: 2.4em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}
.prose h3 {
  font-size: 1.1rem;
  margin-top: 1.8em;
}
.prose p,
.prose li {
  font-size: 1rem;
  color: var(--fg-soft);
}
.prose ul,
.prose ol {
  padding-left: 1.4em;
}
.prose li + li {
  margin-top: 0.3em;
}
.prose strong {
  color: var(--fg);
}
.prose code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: var(--bg-elev);
  border: 1px solid var(--border);
}
.prose blockquote {
  margin: 1.4em 0;
  padding: 8px 16px;
  border-left: 3px solid var(--accent);
  background: var(--bg-elev);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--fg-soft);
}

.prose table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.5em 0;
  font-size: 0.95rem;
}
.prose th,
.prose td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.prose th {
  background: var(--bg-elev);
  font-weight: 700;
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.4em 0;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer p {
  margin: 0.4em 0;
}
.site-footer a {
  color: var(--muted);
  text-decoration: none;
}
.site-footer a:hover {
  color: var(--accent);
}