:root {
  --violet: #7c3aed;
  --violet-dark: #5b21b6;
  --violet-soft: #ede9fe;
  --ink: #1f1933;
  --muted: #6b6480;
  --bg: #fbfaff;
  --surface: #ffffff;
  --code-bg: #1e1b2e;
  --code-fg: #e9e5f7;
  --border: #e5e0f0;
}

[data-theme="dark"] {
  --violet: #7c3aed;
  --violet-dark: #c4b5fd;
  --violet-soft: #2a2245;
  --ink: #ece8fa;
  --muted: #9b94b3;
  --bg: #14111f;
  --surface: #1c172e;
  --code-bg: #0f0c1a;
  --code-fg: #ece8fa;
  --border: #2a2542;
}

html { color-scheme: light dark; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

header.site .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--violet-dark);
  text-decoration: none;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.brand img {
  width: 24px;
  height: 24px;
}

.hero-mark {
  width: 72px;
  height: 72px;
  margin-bottom: 16px;
}

nav a {
  color: var(--ink);
  text-decoration: none;
  margin-left: 20px;
  font-size: 0.95rem;
}

nav a:hover { color: var(--violet); }

.nav-actions {
  display: inline-flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
  background: var(--violet-soft);
  color: var(--violet-dark);
  border-color: var(--violet-dark);
}

.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: inline; }

.hero {
  padding: 80px 0 56px;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
  color: var(--violet-dark);
}

.hero p.tagline {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 0 auto 32px;
  max-width: 560px;
}

.cta {
  display: inline-block;
  padding: 12px 22px;
  background: var(--violet);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  margin: 4px;
  transition: background 0.15s;
}

.cta:hover { background: var(--violet-dark); }

.cta.secondary {
  background: transparent;
  color: var(--violet-dark);
  border: 1px solid var(--border);
}

.cta.secondary:hover {
  background: var(--violet-soft);
}

section {
  padding: 40px 0;
}

section h2 {
  font-size: 1.6rem;
  margin: 0 0 16px;
  color: var(--violet-dark);
}

section h3 {
  margin: 24px 0 8px;
  font-size: 1.1rem;
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 18px 20px;
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.92rem;
  line-height: 1.55;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--violet-soft);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--violet-dark);
}

pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.kw  { color: #c4a8ff; }
.ty  { color: #82d4ff; }
.fn  { color: #ffd6a1; }
.cm  { color: #8a8298; font-style: italic; }
.str { color: #b6e2a1; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 16px;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
}

.feature h3 {
  margin: 0 0 6px;
  color: var(--violet-dark);
  font-size: 1rem;
}

.feature p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

footer.site {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  margin-top: 40px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}

footer.site a {
  color: var(--violet-dark);
  text-decoration: none;
}