:root {
  --bg: #F2F2F7;
  --surface: #FFFFFF;
  --text: #0B0B12;
  --text-secondary: rgba(11, 11, 18, 0.6);
  --accent: #5E5CE6;
  --accent-fg: #FFFFFF;
  --border: rgba(0, 0, 0, 0.06);
  --radius-card: 16px;
  --radius-pill: 999px;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.04);
  --content-max: 720px;
  --hero-max: 980px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B0B12;
    --surface: #1C1C1E;
    --text: #F2F2F7;
    --text-secondary: rgba(242, 242, 247, 0.6);
    --accent: #7A78F0;
    --accent-fg: #0B0B12;
    --border: rgba(255, 255, 255, 0.08);
    --shadow-card: none;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display",
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ─── Header ────────────────────────────────────────── */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.site-header__inner {
  max-width: var(--hero-max);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-header__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
  font-size: 1.0625rem;
}
.site-header__logo img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: block;
}
.site-header__logo:hover { text-decoration: none; }

.site-nav {
  margin-left: auto;
  display: flex;
  gap: 20px;
}
.site-nav a {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}
.site-nav a:hover { color: var(--text); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--accent); }

/* ─── Hero ─────────────────────────────────────────── */

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 24px 64px;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -200px 0 auto 50%;
  width: 700px;
  height: 500px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, var(--accent) 0%, transparent 70%);
  opacity: 0.12;
  z-index: 0;
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
}
.hero__headline {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 20px;
}
.hero__sub {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 0 32px;
}
.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.9375rem;
  border: 1px solid transparent;
  transition: transform 120ms ease, background 120ms ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn--secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.btn--primary:focus-visible {
  outline-color: var(--accent-fg);
}

/* ─── Feature cards ─────────────────────────────────── */

.features {
  max-width: var(--hero-max);
  margin: 0 auto;
  padding: 32px 24px 80px;
}
.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.feature-card {
  background: var(--surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 24px;
  border: 1px solid var(--border);
}
.feature-card__icon {
  width: 32px;
  height: 32px;
  color: var(--accent);
  margin-bottom: 16px;
}
.feature-card__title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--text);
}
.feature-card__body {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* ─── Subpages ──────────────────────────────────────── */

.subpage {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.subpage__title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}
.subpage__card {
  background: var(--surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border);
  padding: 32px;
}
.subpage__card h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 28px 0 12px;
  letter-spacing: -0.01em;
}
.subpage__card h2:first-child { margin-top: 0; }
.subpage__card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin: 24px 0 8px;
}
.subpage__card p,
.subpage__card ul,
.subpage__card ol { margin: 0 0 14px; }
.subpage__card ul,
.subpage__card ol { padding-left: 22px; }
.subpage__card li { margin-bottom: 6px; }
.subpage__card code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875em;
}
.subpage__card strong { color: var(--text); }

/* ─── Footer ────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.site-footer__inner {
  max-width: var(--hero-max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: center;
}
.site-footer a { color: var(--text-secondary); }
.site-footer a:hover { color: var(--text); }
.site-footer__sep { color: var(--text-secondary); }

/* ─── Responsive ────────────────────────────────────── */

@media (max-width: 720px) {
  .features__grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 20px 40px; }
  .subpage { padding: 32px 20px 56px; }
  .subpage__card { padding: 24px 20px; }
  .hero__ctas { flex-direction: column; align-items: stretch; }
  .btn { text-align: center; }
}