:root {
  --bg: #F8F8FB; --surface: #FFFFFF; --text: #14151a; --sub: #5b5d66;
  --line: #E1E1E6; --primary: #0017C1; --primary-2: #3460FB; --primary-light: #E8F1FE;
  --warn-bg: #FFF3B0; --warn-text: #5c4a00; --ok: #0a7a3d;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101116; --surface: #1a1b22; --text: #ececf1; --sub: #a4a6b0;
    --line: #2c2e38; --primary: #7d92ff; --primary-2: #9db0ff; --primary-light: #1c2140;
    --warn-bg: #4a3f00; --warn-text: #ffe680; --ok: #5fd28c;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.85;
  font-family: "Noto Sans JP", system-ui, -apple-system, "Hiragino Sans", "Yu Gothic", sans-serif; font-size: 16px; }
.container { max-width: 960px; margin: 0 auto; padding: 0 16px; }
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.4; margin: 0 0 .6em; }
h1, h2, h3 { text-wrap: balance; word-break: auto-phrase; }
h1 { font-size: clamp(1.5rem, 5vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 3.6vw, 1.8rem); }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; flex-wrap: wrap; }
.brand { text-decoration: none; color: var(--text); font-weight: 700; }
.brand span { color: var(--sub); font-weight: 400; margin-left: .6em; font-size: .85rem; }
.nav { display: flex; gap: 16px; font-size: .9rem; flex-wrap: wrap; }
.nav a { text-decoration: none; }
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, var(--primary-light), var(--bg)); }
.hero p.lead { font-size: 1.08rem; color: var(--sub); max-width: 40em; }
section.block { padding: 48px 0; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 999px; background: var(--primary); color: #fff;
  text-decoration: none; font-weight: 700; border: 0; cursor: pointer; font-size: 1rem; font-family: inherit; text-align: center; }
.btn.ghost { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn[aria-disabled="true"] { background: var(--line); color: var(--sub); cursor: not-allowed; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card .tag { display: inline-block; font-size: .78rem; background: var(--primary-light); color: var(--primary); padding: 2px 10px; border-radius: 999px; margin-bottom: 10px; font-weight: 700; }
.price { font-size: 1.9rem; font-weight: 700; line-height: 1.2; margin: 6px 0; }
.price small { font-size: .85rem; font-weight: 400; color: var(--sub); }
.sub { color: var(--sub); font-size: .9rem; }
ul.check { padding-left: 0; list-style: none; margin: 0 0 1em; }
ul.check li { padding-left: 1.5em; position: relative; margin-bottom: .35em; }
ul.check li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }
.picker { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 14px 0; }
.picker label { display: block; font-size: .85rem; color: var(--sub); margin-bottom: 4px; }
select { width: 100%; padding: 10px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--text); font-size: 1rem; font-family: inherit; }
.tabs { display: flex; gap: 8px; margin: 12px 0; flex-wrap: wrap; }
.tabs button { padding: 8px 16px; border-radius: 999px; border: 1.5px solid var(--primary); background: transparent; color: var(--primary); cursor: pointer; font-family: inherit; font-size: .95rem; }
.tabs button[aria-pressed="true"] { background: var(--primary); color: #fff; }
table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; font-size: .95rem; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--primary-light); color: var(--text); white-space: nowrap; }
.table-wrap { overflow-x: auto; }
details { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; margin-bottom: 10px; }
summary { cursor: pointer; font-weight: 700; }
details p { margin: .7em 0 0; }
.todo { background: var(--warn-bg); color: var(--warn-text); padding: 1px 6px; border-radius: 4px; font-size: .85em; }
.note { color: var(--sub); font-size: .88rem; }
footer { padding: 32px 0 48px; border-top: 1px solid var(--line); margin-top: 24px; font-size: .88rem; color: var(--sub); }
.bottom { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.legal-links a { margin-right: 16px; }
.legal-body dl { margin: 0; }
.legal-table > div { display: grid; grid-template-columns: 11em 1fr; gap: 8px 16px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.legal-table dt { font-weight: 700; }
.legal-table dd { margin: 0; }
@media (max-width: 600px) { .legal-table > div { grid-template-columns: 1fr; } }
.legal-body ol { padding-left: 1.4em; }
.legal-body li { margin-bottom: .6em; }