:root {
  --brand: #3b3fd8;
  --ink: #1c1c28;
  --muted: #5b5f70;
  --line: #d6d8e0;
  --bg: #f6f7fb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--brand); }
header, footer, main { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { display: flex; align-items: center; justify-content: space-between; padding-top: 20px; padding-bottom: 12px; flex-wrap: wrap; gap: 8px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.2rem; color: var(--ink); text-decoration: none; }
.brand img { width: 32px; height: 32px; }
nav a { margin-left: 16px; text-decoration: none; }
main { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 24px 20px; margin-top: 8px; margin-bottom: 24px; }
h1 { font-size: 1.7rem; margin-top: 0; line-height: 1.25; }
h2 { font-size: 1.2rem; margin-top: 2rem; }
.muted { color: var(--muted); font-size: 0.95rem; }
.hero { font-size: 1.1rem; }
.cta { display: inline-block; background: var(--brand); color: #fff; padding: 10px 18px; border-radius: 8px; text-decoration: none; font-weight: 600; }
footer { padding-bottom: 32px; color: var(--muted); font-size: 0.9rem; }
footer a { margin-right: 14px; }
ul li { margin-bottom: 0.35rem; }
.note { border-left: 4px solid var(--brand); background: #f1f2ff; padding: 10px 14px; border-radius: 4px; }
.todo { background: #fff3c4; padding: 0 4px; border-radius: 3px; }