:root {
  --bg: #ffffff; --panel: #f2f2f7; --text: #111114; --muted: #6b6b73; --line: #e3e3e8; --accent: #1f9d63;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e0e10; --panel: #1c1c1f; --text: #f3f3f5; --muted: #a0a0a8; --line: #2a2a2e; --accent: #35c27f; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; padding-bottom: 20px; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
nav a { margin-left: 20px; color: var(--muted); text-decoration: none; }
nav a:hover, a { color: var(--accent); }
main { padding-top: 24px; padding-bottom: 48px; }
h1 { font-size: 2.1rem; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
h2 { font-size: 1.15rem; margin: 36px 0 8px; }
p, ul { margin: 0 0 14px; }
ul { padding-left: 22px; }
li { margin-bottom: 8px; }
footer { padding-top: 20px; padding-bottom: 40px; color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--line); }
.lead { font-size: 1.15rem; color: var(--muted); }
.panels { margin: 32px 0 8px; display: grid; gap: 12px; }
.panel { border-radius: 18px; padding: 16px 18px; min-height: 120px; }
.panel p { margin: 6px 0 0; font-size: 1.1rem; }
.theirs { background: var(--panel); }
.mine { border: 1px solid var(--line); }
.label { font-size: 0.72rem; letter-spacing: 0.12em; color: var(--muted); }
.cursor { display: inline-block; width: 2px; height: 1.1em; margin-left: 1px; vertical-align: text-bottom; background: var(--accent); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .cursor { animation: none; } }
.points { display: grid; gap: 8px 32px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.points h2 { margin-top: 28px; }
.points p { color: var(--muted); }