:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --border: #d8dee4;
  --surface: #f6f8fa;
  --accent: #1a73e8;
  --accent-hover: #1765cc;
  --accent-fg: #ffffff;
  --hero: #eef4fe;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e6edf3;
    --muted: #9198a1;
    --border: #2d333b;
    --surface: #171a20;
    --accent: #4c8df6;
    --accent-hover: #6aa1f8;
    --accent-fg: #ffffff;
    --hero: #121a28;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
}

a { color: var(--accent); }

code {
  font: 0.9em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 4px;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 16px;
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 1;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
}

.nav nav { display: flex; gap: 20px; }
.nav nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.nav nav a:hover, .nav nav a[aria-current] { color: var(--fg); }

/* hero */
.hero {
  background: var(--hero);
  border-bottom: 1px solid var(--border);
  padding: 64px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}

.lead { font-size: 19px; color: var(--muted); margin: 0 0 28px; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 600;
  text-decoration: none;
}

.btn:hover { background: var(--accent-hover); }

.note { color: var(--muted); font-size: 14px; }

.hero-shot { display: flex; justify-content: center; }

.hero-shot img {
  width: 100%;
  max-width: 360px;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.18);
}

/* sections */
section.wrap { padding-top: 56px; }
.hero-inner > * { min-width: 0; }

h2 { font-size: 28px; letter-spacing: -0.01em; margin: 0 0 24px; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  background: var(--surface);
}

.card h3 { font-size: 17px; margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.steps { padding-left: 20px; margin: 0; }
.steps li { margin-bottom: 10px; }

details {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 10px;
}

summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 0; color: var(--muted); }

/* privacy page */
.prose { max-width: 760px; padding-top: 48px; padding-bottom: 24px; }
.prose h1 { font-size: 36px; margin: 0 0 4px; }
.prose h2 { font-size: 22px; margin: 32px 0 8px; }
.prose li { margin-bottom: 8px; }

/* footer */
.foot {
  margin-top: 64px;
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 14px;
}

.foot-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 800px) {
  .hero { padding: 40px 0; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .grid { grid-template-columns: 1fr; }
  .nav nav { gap: 14px; }
}