:root {
  color-scheme: light;
  --ink: #111b45;
  --muted: #596384;
  --blue: #2349dc;
  --line: #dce3f5;
  --surface: #ffffff;
  --background: #f4f7ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.65;
}

header {
  background: linear-gradient(135deg, #1838bd, #2f5af0);
  color: #fff;
  padding: 24px;
}

.header-inner, main, footer {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

.brand {
  color: #fff;
  font-size: 1.1rem;
  font-weight: 800;
  text-decoration: none;
}

main {
  margin-top: 28px;
  margin-bottom: 28px;
  padding: clamp(22px, 5vw, 48px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 14px 40px rgba(17, 27, 69, 0.08);
}

h1, h2 { line-height: 1.25; }
h1 { margin: 0 0 8px; font-size: clamp(2rem, 5vw, 3rem); }
h2 { margin-top: 34px; font-size: 1.3rem; }
p, li { color: var(--muted); }
strong { color: var(--ink); }
a { color: var(--blue); }
ul { padding-left: 22px; }
.updated { margin: 0 0 28px; color: #7480a5; }
.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--blue);
  border-radius: 10px;
  background: #eef2ff;
}
.button {
  display: inline-block;
  margin: 8px 0;
  padding: 12px 18px;
  border-radius: 10px;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}
footer { padding: 0 0 36px; color: #7480a5; text-align: center; }