:root {
  --bg: #0f172a;
  --ink: #e5e7eb;
  --soft: #cbd5e1;
  --muted: #94a3b8;
  --line: #334155;
  --panel: #1e293b;
  --accent: #60a5fa;
  --accent-strong: #2563eb;
  --accent-hover: #1d4ed8;
}
:root[data-theme="light"] {
  --bg: #fff;
  --ink: #1f2937;
  --soft: #374151;
  --muted: #6b7280;
  --line: #e5e7eb;
  --panel: #f8fafc;
  --accent: #2563eb;
  --accent-strong: #2563eb;
  --accent-hover: #1d4ed8;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.page { max-width: 720px; margin: 0 auto; padding: 56px 24px 72px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.mark {
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.mark a { color: inherit; text-decoration: none; }
.theme-toggle {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  font: inherit;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
}
.theme-toggle:hover, .theme-toggle:focus { border-color: var(--accent); color: var(--accent); }
h1 {
  font-size: clamp(29px, 4.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 34px 0 18px;
  font-weight: 660;
  max-width: 24ch;
}
.lede { font-size: 18.5px; line-height: 1.6; color: var(--soft); margin: 0 0 30px; max-width: 60ch; }
.cta {
  display: inline-block;
  background: var(--accent-strong);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  padding: 13px 22px;
  border-radius: 8px;
}
.cta:hover { background: var(--accent-hover); }
.fine { font-size: 13px; color: var(--muted); margin: 14px 0 0; }
.contact-line { margin: 20px 0 0; font-size: 15px; color: var(--soft); }
.contact-line a { color: var(--accent); font-weight: 600; text-decoration: none; }
.contact-line a:hover { text-decoration: underline; }
h2 {
  font-size: 20px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 44px 0 14px;
  font-weight: 640;
}
p.body { margin: 0 0 22px; color: var(--soft); max-width: 62ch; }
ul.body, ol.body { margin: 0 0 22px; padding-left: 1.2rem; color: var(--soft); max-width: 62ch; }
ul.body li, ol.body li { margin: 0 0 8px; }
p.body a, ul.body a, ol.body a { color: var(--accent); }
.panel {
  background: var(--panel);
  border-left: 3px solid var(--accent);
  padding: 18px 22px;
  border-radius: 0 8px 8px 0;
  margin: 18px 0 22px;
}
.panel p { margin: 0; color: var(--soft); max-width: 60ch; }
footer {
  margin-top: 64px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
footer a { color: var(--muted); }