:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: #ffffff;
  --text: #101828;
  --muted: #667085;
  --border: rgba(16, 24, 40, 0.10);
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --surface: rgba(17, 24, 39, 0.82);
    --surface-strong: #111827;
    --text: #f8fafc;
    --muted: #a7b0c0;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.30);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.14), transparent 32rem),
    radial-gradient(circle at bottom right, rgba(124, 58, 237, 0.10), transparent 28rem),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

.container {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-size: 0.95rem;
}

.nav-links a { color: var(--muted); }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }

.hero {
  padding: 96px 0 56px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

h1, h2, h3 {
  line-height: 1.15;
  letter-spacing: -0.035em;
}

h1 {
  margin: 0;
  font-size: clamp(2.6rem, 8vw, 5.4rem);
}

h2 {
  margin-top: 0;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
}

.lead {
  max-width: 720px;
  margin: 24px auto 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
}

.actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}

.button:hover { transform: translateY(-1px); }
.button.primary { background: var(--accent); color: white; }
.button.secondary { border-color: var(--border); color: var(--text); background: var(--surface); }

.section { padding: 34px 0 84px; }

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: 26px;
}

.card h3 { margin: 0 0 10px; font-size: 1.35rem; }
.card p { margin: 0; color: var(--muted); }

.page-shell { padding: 72px 0 88px; }

.content {
  max-width: 820px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 28px;
  padding: clamp(24px, 5vw, 54px);
}

.content h1 { font-size: clamp(2.2rem, 6vw, 4rem); margin-bottom: 10px; }
.content h2 { margin-top: 38px; margin-bottom: 10px; font-size: 1.45rem; }
.content p, .content li { color: var(--muted); }
.content strong { color: var(--text); }
.content ul { padding-left: 22px; }

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  border-radius: 16px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 28px 0 42px;
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links { display: flex; gap: 14px; flex-wrap: wrap; }

@media (max-width: 760px) {
  .nav { align-items: flex-start; padding: 15px 0; }
  .nav-links { gap: 10px 14px; }
  .hero { padding-top: 72px; }
  .grid { grid-template-columns: 1fr; }
}