:root {
  --bg: #ffffff;
  --bg-soft: #f4f6fa;
  --fg: #16181d;
  --muted: #5f6672;
  --line: #e3e6ec;
  --accent: #2f6fe4;
  --accent-soft: #e8f0fd;
  --rail: #e8573c;
  --radius: 18px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0f13;
    --bg-soft: #171a21;
    --fg: #eef0f4;
    --muted: #a1a8b5;
    --line: #272b34;
    --accent: #6c9bff;
    --accent-soft: #1b2640;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.8;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ヘッダー・フッター */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  max-width: 1080px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); font-weight: 700; font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.site-header nav { display: flex; gap: 20px; font-size: 14px; }
.site-header nav a { color: var(--muted); }
.site-footer {
  border-top: 1px solid var(--line); margin-top: 72px;
  color: var(--muted); font-size: 13px;
}
.site-footer .inner {
  max-width: 1080px; margin: 0 auto; padding: 28px 20px 40px;
  display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between;
}
.site-footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }

/* 文書ページ（プライバシーポリシー・サポート） */
.doc { max-width: 760px; margin: 0 auto; padding: 40px 20px 0; }
.doc .eyebrow { color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: .12em; margin: 0; }
.doc h1 { font-size: 30px; line-height: 1.35; margin: 6px 0 8px; }
.doc .dates { color: var(--muted); font-size: 13px; margin: 0 0 28px; }
.doc h2 { font-size: 19px; margin: 40px 0 10px; padding-top: 20px; border-top: 1px solid var(--line); }
.doc h3 { font-size: 16px; margin: 24px 0 6px; }
.doc p, .doc li, .doc td, .doc th { font-size: 15px; }
.doc ul { padding-left: 1.3em; }
.doc li { margin: 4px 0; }
.note {
  background: var(--bg-soft); border-radius: 14px; padding: 14px 18px; margin: 16px 0;
}
.note p { margin: 4px 0; }
.table-wrap { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; min-width: 520px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 13px; }

/* サポート */
.mail-card {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  background: var(--bg-soft); border-radius: var(--radius); padding: 22px 24px; margin: 24px 0 12px;
}
.mail-card .address { font-size: 22px; font-weight: 700; color: var(--fg); word-break: break-all; }
.mail-card button {
  margin-left: auto; font: inherit; font-size: 14px; font-weight: 600;
  padding: 8px 16px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--bg); color: var(--fg); cursor: pointer;
}
.mail-card button:hover { border-color: var(--accent); color: var(--accent); }
.small { color: var(--muted); font-size: 13px; }