:root { --bg: #fbfaf7; --text: #1c1c1e; --sub: #6b6b70; --line: #e4e2dc; --accent: #2f6fed; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #111113; --text: #f2f2f4; --sub: #9a9aa0; --line: #2a2a2e; --accent: #7aa7ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.8 -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; }
header, main, footer { max-width: 680px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; font-weight: 700; letter-spacing: 0.04em; }
header a { color: var(--text); text-decoration: none; }
h1 { font-size: 26px; line-height: 1.4; margin: 24px 0 8px; }
h2 { font-size: 19px; margin: 44px 0 8px; padding-top: 20px; border-top: 1px solid var(--line); }
h3 { font-size: 16px; margin: 28px 0 4px; }
p, li { color: var(--text); }
ul, ol { padding-left: 1.3em; margin: 6px 0; }
a { color: var(--accent); }
footer { margin-top: 56px; padding-top: 20px; padding-bottom: 48px; border-top: 1px solid var(--line); color: var(--sub); font-size: 14px; }
.contact { margin-top: 16px; display: grid; gap: 8px; }
.contact label { font-size: 14px; color: var(--sub); margin-top: 8px; }
.contact textarea, .contact input { width: 100%; padding: 12px; font: inherit; color: var(--text); background: transparent; border: 1px solid var(--line); border-radius: 10px; }
.contact button { margin-top: 12px; padding: 13px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 12px; }
.contact .note { font-size: 13px; color: var(--sub); margin: 4px 0 0; }
.trap { position: absolute; left: -9999px; }